JP3866494B2 - Measuring method and apparatus for spectacle lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is particularly suitable for use in a lens layout block device for determining a processing center of a lens for edge processing of a spectacle lens (hereinafter referred to as a lens) and attaching a processing jig to the processing center. The present invention relates to a lens measurement method and apparatus. More specifically, the present invention relates to a spectacle lens measurement method and apparatus for measuring optical characteristics such as concave surface height, optical center, geometric center, outer diameter, eye point position, distance power measurement position, lens power, etc. Is.
[0002]
[Prior art]
In general, when processing a lens lens (unprocessed spectacle lens) into a shape that matches the frame shape of the spectacle frame, the optical center, geometric center, eye point position, and distance power measurement position of the prescription lens are pre-processes. Check the optical characteristics such as lens power and astigmatic axis, and determine the processing center and the mounting angle of the processing jig (hereinafter referred to as the lens holder) to the lens from this lens information, lens frame shape data, and wearer's prescription data. (Optical layout) Next, based on this, the center of the lens holder is positioned at the processing center of the lens, and the lens holder is attached to the lens (block). The processing center of the lens is the optical center when the lens is a single focus lens, and the eye point position of the lens when the lens is a progressive multifocal lens or a multifocal lens (generally a bifocal lens). When processing, the outer periphery of the lens is trimmed with a grindstone or cutter so that the wearer's pupil center (eye point) matches the optical center or eye point position of the lens, and the shape matches the frame shape of the spectacle frame. To.
[0003]
[Problems to be solved by the invention]
Conventionally, an optical layout and block of a lens, which is a pre-process for lens edge processing, are manually performed by an operator using a dedicated device. However, such work is extremely inefficient and low in productivity, which has been a major obstacle to labor saving. Moreover, since it is necessary to pay close attention to handling the lens so that the lens is not soiled, damaged or damaged, there is a problem that the burden on the operator is heavy.
[0004]
For this reason, layout / block devices for single focus lenses and progressive / multifocal lenses that have recently improved the work efficiency by automatically performing lens optical layout and lens blocking by the lens holder ( Development of ABS (Auto Blocker for Single Visoion Lens, ABM; Auto Blocker for Multifocus Lens) is required.
[0005]
In this case, especially in designing an apparatus, since the shape and optical characteristics differ depending on the type of lens, the development of a measuring method and apparatus corresponding to the type of lens becomes an important issue. That is, the lens is classified into three types: a single focus lens composed of a spherical lens, a progressive multifocal lens composed of an aspheric lens, and a multifocal lens. In addition, there are two types of multifocal lenses, a bifocal lens and a trifocal lens. In the present invention, a single focus lens, a progressive multifocal lens, and a bifocal lens are targeted, and the trifocal lens is not a subject. Therefore, in the following description, the bifocal lens is referred to as a multifocal lens.
[0006]
In the case of a single focus lens, the power of such a lens is displayed as the lens power at the optical center. When performing frequency measurement, the lens is irradiated with light parallel to the optical axis of the lens, and measurement is performed while moving and adjusting the lens in the X and Y directions so that the prism amount becomes zero. However, when the lens is mounted on a lens mounting table made of plastic and measured, there is a problem that the lens is easily damaged when moved and adjusted in the X and Y directions.
[0007]
On the other hand, in the case of a progressive multifocal lens, convex marks 3A and 3B called hidden marks are displayed at a reference position away from the geometric center O as shown in FIG. 11, and these hidden marks are displayed. Since it is designed to be able to derive the geometric center O of the lens 1, the distance, the optical center of the near portion, the position of the eye point 11 and the like from the positions of 3A and 3B, from the positions of these hidden marks 3A and 3B. The distance power measurement part is found and the power (distance power) is measured.
[0008]
In the case of a multifocal lens, in particular, a plastic multifocal lens, unlike the progressive multifocal lens 1, as shown in FIG. Since it is designed so that the positions of the center 15 and the eye point 16 can be obtained, the position of the eye point 16 is found from the position of the upper edge 17 of the small ball 13B, and the power (distance power) is measured. Yes. Therefore, when measuring the power of the progressive multifocal lens 1 and the multifocal lens 13, unlike the power measurement of the single focus lens, the mark is detected in advance, and the position of the distance power measurement position 6 or the eye point 16 is determined from the mark position. It is necessary to calculate. The progressive multifocal lens 1 and the multifocal lens 13 will be described later.
[0009]
Further, the lens power measurement in the lens meter is determined by the JIS standard to measure with the back surface of the lens as a reference. However, since the back surface of the lens is formed as a concave surface, the height of the measurement position of the lens differs between the plus-strength lens and the minus-strength lens at the lens measurement center. For example, if the lens is mounted on a plastic lens and the lens is placed with the concave surface down, the height of the concave surface (frequency measurement) depends on whether the plus lens is placed or the minus lens is placed. The height of the part is greatly different. For example, the difference in height between the concave surfaces of a plus 15 diopter (D) lens and a minus 15 D lens is about 8 mm. As a result, an error occurs in the reference position, and an error occurs in the measurement frequency. Therefore, in order to accurately measure the lens power regardless of the type of lens, the height of the concave surface b of the lens is measured, and the lens is installed so that the concave surface b coincides with the measurement reference height position. Need to do.
[0010]
Therefore, in order to realize the practical use of the lens layout block device, there is an urgent need to develop a measurement method and device capable of performing the measurement well and accurately according to the type of lens.
[0011]
The present invention has been made in order to meet the above-described conventional problems and requirements, and the object thereof is the concave surface height of the lens, the optical center, the geometric center, the eye point position, the distance power measurement position, and the power. It is an object of the present invention to provide a spectacle lens measurement method and apparatus so that optical characteristics such as the above can be measured favorably and accurately.
[0012]
[Means for Solving the Problems]
  In order to achieve the above object, a first invention includes a lens holding and conveying device, a height measuring device, and a power measuring device, and the lens holding and conveying device forms a convex surface of a lens to be tested which is a single focus lens.GeometryA step of detecting that the suction member is pressed to a plurality of locations deviated from the center, and the lens to be sucked and held by the detection step is conveyed above the height measurement position by the lens holding and conveying device,By detecting the time it takes for the sensor to detect the concave surface of the lens to be tested by lowering it from the predetermined reference height positionThe step of measuring the concave surface height by the height measuring device and the lens holding and conveying device transporting the lens to be measured above the power measuring position so that the power measuring portion of the concave surface becomes the measurement reference height position. And adjusting the height of the concave surface obtained by the measuring step, and measuring the power of the lens to be measured by the power measuring device.
[0013]
  According to a second aspect of the present invention, there is provided a lens holding / conveying device, an image pickup processing device, a height measuring device, and a power measuring device, wherein the lens holding / conveying device is a progressive multifocal lens or a multifocal lens. ConvexGeometryA step of detecting that the suction member is pressed to a plurality of positions shifted from the center, and the lens held by the detection step is transported above the mark detection position by the lens holding transport device, and the image Imaging a mark formed on the convex surface of the lens to be examined by an imaging processing device, calculating a lens type, a lens left-right identification result, and a frequency measurement position from information of the captured image; and the detection step The test lens held by suction is conveyed above the height measurement position by the lens holding and conveying device,By detecting the time it takes for the sensor to detect the concave surface of the lens to be tested by lowering it from the predetermined reference height positionThe step of measuring the concave surface height by the height measuring device, and the lens holding and conveying device transporting the lens to be measured above the power measuring position, and the power measuring position of the concave surface obtained in the calculating step is measured. A step of adjusting the concave surface height obtained by the measurement step so as to be a reference height position and measuring the power of the lens to be measured by the power measuring device is provided.
[0015]
  A third invention includes a measurement apparatus for a single focus lens that measures optical characteristics of a single focus lens, and a multifocal lens measurement apparatus that measures a mark and optical characteristics of a progressive multifocal lens or a multifocal lens, In the measurement device for a single focus lens, the suction member is a convex surface of the single focus lens.GeometryDetection means for detecting that it has been pressed at a plurality of positions shifted from the center, a lens holding / conveying device for conveying the suction-held single focus lens above the height measurement position and the power measurement position, and the concave surface height of the single focus lens A height measuring device for measuring the height and a power measuring device for measuring the power, the measuring device for the multifocal lens is a progressive multifocal lens or a convex surface of the multifocal lens.GeometryA detecting means for detecting that it is pressed against a plurality of positions deviated from the center, and a lens holding and conveying device that conveys the suction-held progressive multifocal lens or the multifocal lens to above the mark detection position and the height and power measurement position; An image imaging processing device that images a mark formed on a progressive multifocal lens or a convex surface of a multifocal lens and processes the image to detect the type of lens, detection of left / right identification of the lens, and frequency measurement position; ,Of the test lens arranged at the height and power measurement position.Height measuring device for measuring concave surface heightandHas a frequency measuring device that measures frequencyThe height measuring device of the single focus lens measuring device and the multifocal lens measuring device lowers the suction member holding the lens to be tested from a predetermined reference height position by driving a motor. The height of the concave surface of the test lens is measured by detecting the time until the concave surface of the test lens is detected as the number of pulses applied to the motor.Is.
  According to a fourth invention, in the first invention, after the concave surface height of the test lens is measured, the test lens is moved to the power measurement position, and the height reference position at the time of measurement is made constant, and the lens power Is to measure.
According to a fifth invention, in the second invention, after the concave surface height of the test lens is measured, the test lens is returned to the reference height position again, and the height reference position at the time of measurement is made constant. It measures frequency.
[0016]
In the first and second inventions, the lens holding and conveying device conveys the plurality of positions shifted from the center of the convex surface of the lens to be examined by suction. Therefore, there is no risk of scratching the lens even if the lens moves in the X and Y directions during power measurement. Further, since the concave surface height is held at the measurement reference height position, the reference position does not shift. The test lens is a single focus lens, and the power measurement position is the optical center.
[0017]
  In a third aspect of the invention, the lens holding and conveying device is a convex surface of the lens to be examined.GeometryA plurality of locations shifted from the center are sucked and held for transport. Therefore, there is no possibility of scratching the lens even if the lens moves in the X and Y directions. The test lens is a progressive multifocal lens or a multifocal lens. In the case of a progressive multifocal lens, the power measurement position is a distance power measurement position. In the case of a multifocal lens, the position of the eye point is the frequency measurement position. The mark of the progressive multifocal lens is a hidden mark, an identification mark, or the like. The mark of the multifocal lens is the upper edge of the small ball.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is a diagram showing a positional relationship with a spectacle lens measuring device according to the present invention, FIG. 2 is a plan view of a main part showing an embodiment of a lens holding and conveying device for progressive multifocal and multifocal lenses, FIG. 2 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a view showing the suction means, FIGS. 5A, 5B, and 5C are a plan view, a sectional view and a bottom view of the lens mounting table, and FIG. FIG. 7 is a schematic diagram of an image pickup processing device and a power measuring device, FIG. 8 is a flow diagram of an optical system, FIG. 9 is a front view of a height measuring device for a single focus lens, and FIG. It is a figure which shows the principal part of a frequency measurement apparatus.
[0019]
In these drawings, in the present embodiment, the test lens is made of three types of progressive multifocal lens, multifocal lens and single focus lens made of plastic, and its optical layout and block are automatically performed. The example applied to the spectacle lens measuring apparatus used for the lens layout block apparatus is shown. Therefore, a spectacle lens measuring device 30 that enables mark detection and optical characteristics (eye point position, geometric center, power, concave surface height, etc.) of a progressive multifocal lens and a multifocal lens, and a single focus lens A spectacle lens measuring device 31 that can measure the optical characteristics (optical center, geometric center, power, concave surface height, etc.).
[0020]
First, a progressive multifocal lens and a multifocal lens will be described with reference to FIGS.
[0021]
In FIG. 11, 1 is an unprocessed plastic progressive multifocal lens (hereinafter also referred to as a lens or a lens to be tested), 2 is a horizontal reference line passing through the geometric center O, 3A and 3B are hidden marks, and a horizontal reference line 2 are formed at two locations that are equidistant from the geometric center O (for example, 17 mm). These hidden marks 3A and 3B are displayed with the same small circle or small circle and letters, and the addition power of the lens 1 (the outer vertex refractive power of the distance portion and the outer portion of the near portion is displayed under each mark. A number 4 for displaying (difference in vertex refractive power) and an identification mark 5 for displaying the type of lens 1 are displayed. The number 4 indicating the addition power is displayed as a three-digit number (for example, 300) under the hidden mark located on the ear side when worn. Therefore, it is possible to identify whether the lens is a left-eye lens or a right-eye lens by knowing whether the three-digit number is displayed below the left or right hidden mark. In this case, FIG. 11 shows a lens for the right eye, and the left hidden mark 3A is indicated by a small circle “◯” and the right hidden mark 3B is indicated by a Roman letter “H”. The hidden marks 3A and 3B, the number 4 indicating the addition power, and the identification mark 5 are formed in the form of minute protrusions (about 2 to 4 μm) on the convex surface of the lens at the time of molding.
[0022]
6 is a distance power measurement part, 7 is a near power measurement part, 8 is a part looking far away (distance part), 9 is a part looking near (near part), and 10 is a part whose power changes continuously ( (Progression part), 11 is the position of the eye point. The positions of the distance power measurement portion 6, the near power measurement portion 7 and the eye point 11 vary depending on the type and size of the lens 1, but a predetermined reference position away from the geometric center O, for example, the position of the eye point 11. Is determined at a position separated by a predetermined distance d1 (for example, 2 mm) above the geometric center O, and the distance center 12 is determined by a predetermined distance d2 (for example, 4 mm) above the position of the eye point 11. It has been. Therefore, if the images of the hidden marks 3A and 3B are taken in, image-processed and their position coordinates are calculated, the positions of the geometric center O, the eye point 11 and the distance center 12 can be obtained.
[0023]
In FIG. 12, 13 is a plastic multifocal lens for the right eye (hereinafter also referred to as a lens or a test lens), 13A is a ball, 13B is a small ball, 14 is a distance power measurement unit, and 15 is a near power measurement. The center of the part, O is the geometric center, and 16 is the position of the eye point (distance power measurement position). When the lens 13 is made of plastic, the small balls 13B are formed on the surface of the base ball 13A so as to protrude in a wedge shape when viewed from the side, and the upper edge 17 is predetermined below the horizontal reference line 18 passing through the geometric center O. It is formed so as to be separated by a distance d3 (for example, 5 mm). Further, in the case of a right-eye lens, the small ball 13B is formed such that the center 15 of the near power measurement unit is shifted from the geometric center O to the right by a predetermined distance d4 (for example, 5 mm). The position of the eye point 16 is determined at a position shifted from the geometric center O to the small ball 13B side by a predetermined distance d5 (for example, 2.5 mm) on the horizontal reference line 18. Therefore, if the image of the small ball 13B is taken and the position coordinates of the center of the upper edge 17 are calculated by image processing, the positions of the geometric center O and the eye point 16 can be obtained. In this case, the upper edge 17 of the small ball 13B corresponds to the hidden marks 3A and 3B in the progressive multifocal lens 1. In addition, by knowing which side of the small ball 13B is shifted from the geometric center O to the left or right side, it is possible to identify whether it is for the left eye or for the right eye.
[0024]
The single-focus lens is composed of a spherical lens, the optical center is substantially coincident with the geometric center at the eye point position, and does not have the above-mentioned distance power measurement unit, near power measurement unit, etc. Is omitted.
[0025]
In FIG. 1, the test lens S1 is the progressive multifocal lens 1 or the multifocal lens 13, and the spectacle lens measuring device 30 for detecting the mark and measuring the optical characteristics includes a lens holding and conveying device 32. Yes. A1, A2, A3, and A4 are the block position, origin position, mark detection position, and height / frequency measurement position of the lens S1.
[0026]
The block position A1, the origin position A2, the mark detection position A3, and the height / frequency measurement position A4 are positioned on the same straight line extending in the X direction. The block position A1 is a position to which the test lens S1 is supplied, and the lens holder 33 (FIG. 4) is attached via the elastic seal 34 to the tested lens S1 that has been measured for optical characteristics. Position. At this position, a lens mounting table 35 described later is provided. The origin position A2 is an initial position of the suction means 66 described later. The mark detection position A3 is an image of a mark formed on the lens S1 to be detected, and the mark position is detected by processing the image. From this mark information, the geometric center of the lens S1 and the position of the eye point are detected. The lens holding device 36 (FIG. 6) described later is provided. In this case, in the case of the progressive multifocal lens 1 described above, the mark detection of the test lens S1 is performed by using the hidden marks 3A and 3B formed on the convex surface a, the number 4 indicating the addition power, and the mark indicating the lens type. 5 (FIG. 11), and in the case of the multifocal lens 13, the upper edge 17 of the small ball 13B is detected as a mark. The height / power measurement position A4 is a position for measuring the height of the concave surface b and the lens power (distance power) of the lens S1, and a height measuring device 37 (FIG. 3) described later is provided.
[0027]
1 to 4, the lens holding and conveying device 32 sucks and holds the test lens S1 supplied to the block position A1, and sequentially conveys it to the mark detection position A3 and the height / power measurement position A4. When the measurement of the optical characteristics of S1 is completed, the test lens S1 is returned to the original block position A1, and two tables are movable independently in two directions (X and Y directions) orthogonal to each other in the horizontal plane. That is, an X table 40 and a Y table 41 are provided.
[0028]
The X table 40 is movably disposed along a pair of front and rear guide rails 42 and a ball screw 43 installed on the upper surface of the Y table 41, and is configured to be driven by an X table stepping motor (not shown). Yes. A toothed pulley 44 is attached to one end of the ball screw 43, and the rotation of the X table stepping motor is transmitted to the toothed pulley 44 via a timing belt.
[0029]
The Y table 41 is movably disposed along a pair of left and right guide rails 47 and a ball screw 48 installed on a gantry 46, and is configured to be driven by a Y table stepping motor (not shown).
[0030]
Further, on the upper surface of the X table 40, a pair of left and right side plates 50, a Z table 51 that can move up and down, a Z table stepping motor 52, and a screw rod that transmits the rotation of the stepping motor 52 to the Z table 51. 53 is arranged. The stepping motor 52 is installed downward on the upper surface of the X table 40, and its output shaft 54 protrudes below the X table 40 to have a toothed pulley 55. The stepping motor 52 is provided at the lower end of the pulley 55 and the screw rod 53. A timing belt 57 is stretched around the toothed pulley 56. The screw rod 53 is rotatably supported at its lower end by a bearing 58 provided on the X table 40, and a nut 59 attached to the lower surface side of the Z table 51 is screwed to the upper end side.
[0031]
The Z table 51 integrally has a pair of side walls 61A, 61A facing and close to the side plate 50, and is held by a linear guide 62 so as to be movable up and down, and the rotation of the stepping motor 52 is the screw. When transmitted to the bar 53, it is configured to move up and down together with the nut 59.
[0032]
A base end portion 64 </ b> A of the frame 64 is fixed to the distal end portion of the Z table 51 by a plurality of set screws 65. The front end portion 64B of the frame 64 includes a pair of horizontal arm portions 64a and 64b that are opposed to each other by being formed in a U shape in plan view, and a connecting portion 64c that connects one end of these arm portions, Two adsorbing means 66 for adsorbing and holding the vicinity of the outer periphery of the convex surface a of the lens S1 are disposed on the inner surfaces of the arm portions 64a and 64b facing each other.
[0033]
The suction means 66 is moved to the block position A1, the origin position A2, the mark detection position A3, and the height / frequency measurement position A4. As shown in FIGS. A suction pad 69 made of an elastic material such as rubber is provided integrally on the lower end side of the cylinder 68, and is attached to a slide member 67 arranged to be movable up and down with respect to the arm portions 64a and 64b. . Moreover, the adsorption | suction means 66 is connected to the vacuum pump which is not shown in figure via piping. The slide member 67 is attached to a guide rail 70 attached to the arm portion 64a (64b) so as to be movable up and down, and is urged downward by a tension coil spring 71, so that the upper end of the slide member 67 is a normal arm portion 64a (64b). ). The four adsorbing means 66 are attached to the respective arm portions 64a and 64b so as to be positioned at substantially equal intervals on the same virtual circumference centered at the approximate center of the tip end portion 64B (FIG. 2). It has been. The distance R from the center O to each suction means 66 is set sufficiently large so as not to interfere with mark detection, concave height measurement, power measurement, and lens holder 33 mounting.
[0034]
Furthermore, a total of four sensors 73 are attached to each of the arm portions 64a and 64b, corresponding to the suction means 66. The sensor 73 detects that the suction means 66 has been pressed against the convex surface a of the lens S1, and includes a light emitting diode 74 and a light receiving diode 75 (FIG. 4), and the slide member between the two diodes. A bent piece 76 formed to be bent at 67 is normally inserted from above to block the light emitted from the light emitting diode 74 and keep the sensor 73 in the OFF state. The detection signal of each sensor 73 is sent to the control unit of the lens layout block device.
[0035]
In FIG. 4, the lens holder 33 is made of a metal cylindrical body, and has a concave spherical lens holding surface 80 on the front end surface. When the lens S1 is held, a thin ring shape is formed on the lens holding surface 80 in advance. The elastic seal 34 is affixed to the convex surface a of the lens S1 to be affixed. On the lens holding surface 80, a large number of minute protrusions 81 having a triangular cross-sectional shape are formed radially over the entire circumference in order to increase the tight coupling force with the elastic seal 34 and prevent the elastic seal 34 from rotating. ing. An adhesive is applied to both surfaces of the elastic seal 34. Such a lens holder 33 is conventionally known (eg, Japanese Utility Model Laid-Open No. 6-24854, Japanese Patent Application No. 11-224598).
[0036]
4 and 5, the lens mounting table 35 disposed at the block position A 1 is attached to a metal cylinder 86 installed on a base 85 and an upper end opening of the cylinder 86. A ring 87 made of an elastic material such as rubber is provided, and the test lens S1 is placed on the ring 87 with the concave surface b side down. A lens support mechanism 88 is incorporated in the lens mounting table 35.
[0037]
The lens support mechanism 88 prevents the test lens S1 from being inclined when the test lens S1 placed on the lens mounting table 35 is pressed and held by the suction means 66 and when the lens holder 33 is blocked. This is for holding the convex surface a horizontally and adopts a gimbal mechanism. For this reason, the swing plate 92 and the swing ring 93 are supported so as to be swingable in two orthogonal directions using two axes (cardan shafts) 90 and 91 that intersect on the same plane. The oscillating plate 92 is formed in a disc shape and is disposed below the base 85. The outer periphery is surrounded by a swing ring 93, and the outer periphery is surrounded by a fixing ring 94. Of the two shafts, the first shaft 90 is composed of a pair of horizontal support pins provided to face the inner surface of the swing ring 93 and pivotally supports the rocking plate 92. The second shaft 91 is composed of a pair of horizontal support pins provided to face the inner surface of the fixed ring 94, and the swing ring 93 is swingable in a direction perpendicular to the swing direction of the swing plate 92. It is pivotally supported. The fixing ring 94 is fixed to the base 85.
[0038]
The lens support mechanism 88 includes three supports 96 disposed on the swing plate 92 so as to be movable up and down. These supports 96 are all the same length, are arranged on the same circumference centered on the center of the swing plate 92 and are spaced equidistantly in the circumferential direction, and slide through the insertion holes 97 provided in the base 85. It penetrates freely. The upper end portion of each support 96 passes through the cylindrical body 86 and is located in the vicinity of the upper end opening portion inside the ring 87.
[0039]
In FIG. 6, the lens holding device 36 disposed at the mark detection position A3 is provided with a lens support cylinder 100 whose both ends are open, and the inside of the lens support cylinder 100 is evacuated by a vacuum pump 101. The center of the concave surface b of the test lens S1 is fixed to the upper surface of the lens support tube 100 by suction. The lens support cylinder 100 is sufficiently small so that it does not interfere with the projection of the hidden marks 3A and 3B of the progressive multifocal lens 1, the number 4 indicating the addition power, the identification mark 5 and the small balls 13B of the multifocal lens 13. It has a diameter (for example, 8 mmφ) and is erected at the center of the upper surface of the condenser lens 102. The condensing lens 102 is incorporated in the lens barrel 104 together with the other condensing lens 103 via a seal member, and a sealed space surrounded by both the lenses 102 and 103 and the lens barrel 104 forms a vacuum suction chamber 105. Formed and connected to the vacuum pump 101 via a pipe. The condensing lens 102 has a through hole 106 formed in the center, and the inside of the lens support tube 100 and the vacuum suction chamber 105 are communicated with each other through the through hole 106.
[0040]
When the concave surface b of the test lens S1 is sucked and held by the thin lens support tube 100 as described above, the test lens S1 can be securely fixed. Further, even when the test lens S1 is a plus lens and a minus lens, the difference in height of the convex surface can be reduced as compared with a case where the lens S1 is simply placed on a mounting table made of transparent plastic or the like. That is, for example, when a minus lens of −10D and a plus lens of + 6D are adsorbed and fixed to the upper surface of the lens support tube 100, the height difference d of the convex surface a becomes 6.8 mm, and the lens is placed on a placing table such as plastic. It can be made smaller than the difference in height of the convex surface (11.3 mm). Thereby, the depth of focus of the optical system can be reduced, and a bright and easy-to-see projection image can be obtained.
[0041]
In FIG. 3, the height measuring device 37 disposed at the height and power measuring position A4 includes a cylindrical body 110 having a different diameter and an upper surface formed into a convex spherical surface and a lower surface opened. The body 110 is fixed on a movable plate 111 that can move up and down by a plurality of set screws. Further, four small holes 113 that transmit the light 112 from the frequency measurement light source are formed on the same circumference at equal intervals in the circumferential direction at a position spaced apart from the axial center on the upper surface of the cylindrical body 110. ing. The distance from the center of the cylindrical body 110 to each small hole 113 is about 2 mm.
[0042]
The movable plate 111 has a lower surface outer periphery supported by a plurality of support pins 114, and has an insertion hole 122 through which light 112 from the frequency measurement light source passes. The support pin 114 slidably passes through the insertion hole 116 provided in the base 85 and is urged upward by a compression coil spring 117. A retaining ring 118 for preventing is attached. A sensor 120 that detects the lowering of the support pin 114 is disposed on the lower surface side of the base 85. The base 85 incorporates a collimator lens 121 that collects the light 112, and the focal point of the collimator lens 121 is the upper surface of the small hole 113 on the upper surface of the cylindrical body 110. The cylindrical body 110 is used as a lens support for supporting the lower surface of the test lens S1 when measuring the lens power.
[0043]
The height measuring device 37 measures the height of the concave surface b of the lens S1 to be tested by operating the Z table 52 by driving the Z table stepping motor 52 to lower the suction means 66 from a predetermined reference height position. When the test lens S1 is brought into contact with the upper surface of the cylindrical body 110, the center thickness varies depending on the plus lens, the minus lens, and the lens power. Therefore, the number of pulses applied to the stepping motor 52 from the start of the driving of the stepping motor 52 to the time when the cylindrical body 110 and the support pin 114 are pushed down by the lens S1 and the sensor 120 detects the support pin 114. Can be measured to measure the height of the concave surface b. In this case, the number of pulses increases as the test lens has a higher concave surface b. In measurement, the lens for measurement S1 is positioned on the upper surface of the cylindrical body 110 by positioning in the X and Y directions so that the distance power measurement position on the concave surface b of the lens S1 corresponds to the four small holes 113 of the cylindrical body 110. And the test lens S1 is pushed down until the sensor 120 detects the support pin 114. Note that, after the measurement of the height of the concave surface b of the lens S1 is completed, there is a reference measurement position in advance, and its positional information is given by the number of pulses, so that the concave surface b is determined based on the measurement result. The height of the test lens S1 is corrected so that it becomes the focal position (reference measurement position) of the collimator lens 121. Specifically, the difference between the driving pulses of the stepping motor is corrected to match the reference measurement position. Therefore, the height reference position at the time of measurement is constant even if the optical power changes.
[0044]
In FIG. 7, reference numeral 130 denotes an image pickup processing device arranged at the mark detection position A3, and 131 denotes a frequency measurement device arranged at the height / frequency measurement position A4.
[0045]
The image pickup processing device 130 detects a mark on the lens S1 to be detected, and calculates optical characteristics (center between marks, eyepoint position, etc.) from the position information of the mark by calculation processing. A light source 135 disposed on the convex surface a side of S1 and a condenser lens 136, a diaphragm 137, and a half mirror 138 disposed in the optical path between the light source 135 and the lens S1 to be tested are provided. The light source 135 is used for mark detection of the progressive multifocal lens 1 shown in FIG. 11. In order to obtain a sharp image of the hidden marks 3A and 3B, the number 4 indicating the addition power, and the identification mark 5, For example, an LED that emits red light with a narrow wavelength width is used. As the half mirror 138, for example, a mirror having a transmittance to reflectance ratio of 7 to 3 is used.
[0046]
Further, the image pickup processing device 130 includes a switching unit 140 disposed on the convex surface a side of the lens S1 to be tested, an image pickup device 141 such as a CCD, an image processing device 142, a focus correction lens 143, and a concave surface b side. The lens holding device 36, the condensing lenses 102 and 103, the imaging lens 144, the reflective screen 145 as an image display means, the light source 146, and the like are provided.
[0047]
The switching unit 140 includes a shutter 150 and a driving device 151 such as an air cylinder that selectively inserts the shutter 150 into the optical path between the half mirror 138 and the lens holding device 36. When the progressive multifocal lens 1 detects the hidden marks 3A, 3B, etc., or when the multifocal lens 13 detects the upper edge 17 of the small ball 13B, the shutter 150 is retracted outside the optical path, and the lens power It is configured to be inserted into the optical path at the time of measurement. This is to prevent extraneous light from the image pickup processing device from entering the image pickup device 141 via the half mirror 138 during power measurement.
[0048]
The focus correction lens 143 is retracted outside the optical path when the mark of the progressive multifocal lens 1 is detected, and the focus of the imaging device 141 is detected when the upper edge 17 of the small ball 13B of the multifocal lens 13 is detected. In order to match with the convex surface a of S1, it is inserted into the optical path between the half mirror 138 and the imaging device 141 and used.
[0049]
The imaging lens 144 is composed of a convex lens, and forms an image of the surface on the convex surface side of the test lens S1 collected by the condenser lens 103 on the reflective screen 145 with the same size as this. The imaging lens 144 is used as a light transmission lens when the test lens S1 is the multifocal lens 13.
[0050]
The reflective screen 145 has a reflective sheet in which a fine powder such as glass or aluminum is applied to the surface of the substrate as particles that enhance the reflectance and enhance the light scattering action. Further, in order to make the surface brightness and background uniform, the motor 153 is rotated at high speed (for example, 3400 rpm) to reflect the image on the convex surface of the lens S1. For this reason, the contrast between the hidden mark portion and the non-hidden mark portion becomes clear, and the image on the convex surface side of the lens S1 returns to the convex surface a side of the lens S1 through the original optical path, By being reflected by the mirror 138, an image is formed on the light receiving surface of the imaging device 141. Then, the image is processed by being captured by the image processing device 142.
[0051]
The light source 146 is used for imaging the multifocal lens 13 shown in FIG. 12, and a red light LED is used. For example, eight light sources 146 are arranged at equal intervals in the circumferential direction near the outer periphery below the imaging lens 144. It is arranged. The light emitted from the light source 146 strikes the reflective screen 145 and is reflected, and then irradiates the concave surface b of the lens S1 through the imaging lens 144 and the condensing lenses 103 and 102. Is reflected by the half mirror 138, passes through the focus correction lens 143, and forms an image on the imaging device 141. The reason why the multifocal lens 13 is irradiated from the concave surface b side by the light source 146 is that the shadow of the upper edge 17 of the small ball 13B can be clearly imaged compared to the case where the multifocal lens 13 is irradiated from the convex surface a side.
[0052]
The power measurement device 131 includes the height measurement device 37 on which the test lens S1 is placed with the concave surface b side down, a power measurement light source 160 that irradiates the test lens S1 from the concave surface b side, A light-transmitting lens 161 that collimates the light 112 emitted from the light source 160, a collimator lens 121 that forms a light source image on the convex surface a of the lens S1, a collimator lens 121, and the light-transmitting lens 161 A target 162 is provided between the two layers so as to be movable in the optical axis direction. In addition, three mirrors 165a, 165b, 165c, an objective lens 166, and a transmission type screen 167 are provided on the convex surface a side of the lens S1. In this case, in the present embodiment, since the test lens S1 is the progressive multifocal lens 1 or the multifocal lens 13, the distance power is measured by the power measuring device 131. The measurement range of the lens power by the power measuring device 131 is, for example, −20D to + 15D.
[0053]
The light source 160 is composed of four ultra-bright light emitting diodes (LEDs) 160a to 160d, and is arranged at each vertex position of a square centering on the optical axis in order to facilitate arithmetic processing. The distance from the optical axis to each of the LEDs 160a to 160d is about 2 mm. The peak wavelength of the LEDs 160a to 160d is 715.2 nm.
[0054]
As the target 162, a pinhole plate having a pinhole 163 with a diameter of about 1 mmφ at the center is used, and an image of the pinhole 163 is applied to the transmissive screen 167 by the action of the collimator lens 121 and the objective lens 166. Is projected as a pattern image.
[0055]
The objective lens 166 is disposed between the mirror 165a and the mirror 165b.
[0056]
The transmission screen 167 is made of a milky white synthetic resin plate or ground glass, and is disposed so as to face the image pickup device 141 of the image pickup processing device 130 with the half mirror 138 interposed therebetween.
[0057]
In FIG. 1 again, the spectacle lens measuring device 31 measures the optical characteristics (lens power, concave surface height, etc.) of the lens S2 made of a single focus lens, and includes a lens holding and conveying device 170. . B1, B2, B3, and B4 are the block position, origin position, height measurement position, and power measurement position of the lens S2.
[0058]
The block position B1, the origin position B2, the height measurement position B3, and the frequency measurement position B4 are positioned on the same straight line extending in the X direction. The block position A1 is a position to which the test lens S2 is supplied, and the lens holder 33 (FIG. 4) is attached via the elastic seal 34 to the tested lens S2 that has been measured for optical characteristics. Position. At this position, a lens mounting table 35 having the same structure as the lens mounting table 35 (FIG. 5) disposed at the block position A1 is disposed. The origin position B2 is the initial position of the suction means 180. The height measuring position B3 is a position for measuring the height of the concave surface of the lens S2 to be measured, and is provided with a height measuring device 190 shown in FIG. The power measurement position B4 is a position where the optical characteristic (lens power) of the lens S2 to be measured is measured, and the power measurement device 200 (FIG. 10) is provided.
[0059]
The lens holding / conveying device 170 has substantially the same structure as the lens holding device 32 for the lens S1 described above, and can be independently moved in three orthogonal directions (X, Y, Z directions). A Y table 173 and a Z table 174 are provided.
[0060]
The X table 172 is movably disposed along a pair of front and rear guide rails 175 and a ball screw 176 installed on the upper surface of the Y table 173, and is configured to be driven by an X table stepping motor (not shown). Yes.
[0061]
The Y table 173 is movably disposed along a pair of left and right guide rails 177 and a ball screw 178 installed on the mount 46 (FIG. 2), and is configured to be driven by a Y table stepping motor (not shown). Has been.
[0062]
The Z table 174 is arranged on the upper surface of the X table 40 so as to be movable up and down by a linear guide, and is configured to be driven by a Z table stepping motor (not shown). The Z table 174 includes a frame 179. At the tip of the frame 179, there are four suction means 180 for sucking and holding the outer periphery of the convex surface a of the test lens S2, and each suction means 180 has a test lens. A sensor 181 for detecting that the sensor has been pressed against S2 is provided. The frame 179, the suction unit 180, and the sensor 181 have the same structure as the frame 64, the suction unit 66, and the sensor 73 shown in FIGS.
[0063]
9, the height measuring device 190 is basically the same in structure as the above-described height measuring device 37 (FIG. 3), and a support pin 191 disposed on the base 85 so as to freely move up and down. A compression coil spring 192 that urges the support pin 191 upward, a lens receiving member 193 attached to the upper end of the support pin 191, and a sensor 194 that detects the lowering of the support pin 191 are provided. The upper surface of the lens receiving member 193 is formed into a convex spherical surface, and the test lens S2 is installed.
[0064]
When the Z table 174 is lowered by driving the stepping motor and the suction means 180 is lowered from the predetermined reference height, the time until the subject lens S2 comes into contact with the upper surface of the lens receiving member 193 is the height of the concave surface b. Therefore, the height of the concave surface b of the lens S2 to be measured can be measured by counting the number of drive pulses applied to the stepping motor. In measurement, the approximate center of the concave surface b of the lens S2 to be measured is pressed against the upper surface of the lens receiving member 193, the lens receiving member 193 is pressed down until the sensor 194 detects the support pin 191, and the sensor 194 starts from the start of driving the stepping motor. The number of drive pulses applied to the stepping motor is counted until the support pin 191 is detected.
[0065]
In FIG. 10, the power measuring device 200 is different from the power measuring device 131 (FIG. 7) for the lens S1 described above in that the lens mounting table is not provided and the pattern image of the target is detected by the line sensor. Since only the difference is basically the same, the entire apparatus is not shown. Such a line sensor type power measuring device is the same as the lens meter disclosed in Japanese Patent Publication No. 8-20334 and the like, and is well known in the art.
[0066]
When measuring the power of the test lens S2, the suction lens 180 conveys the test lens S2 above the power measurement position B4 and adjusts the height so that the concave surface b coincides with the focal point of the collimator lens 201. Then, the lens S2 is moved in the X and Y directions to measure the power.
[0067]
Next, a measurement method for the test lens S1 will be described.
When the spectacle lens measuring device 30 is in the initial state, the X table 40 is waiting at the origin position A2 (FIG. 1). In this state, the lens S1 supplied to the lens layout block device is transported by an appropriate transport robot and placed on the lens placement table 35 at the block position A1. When the test lens S1 is placed on the lens placement table 35, the X table 40 is operated by driving the X table stepping motor, so that the suction means 66 waiting at the origin position A2 is moved to the block position A1. Move upward. When the X table 40 stops at that position, the Z table stepping motor 52 is driven to lower the Z table 51, and the suction means 66 is pressed against the convex surface a of the lens S1 to be sucked and held (FIG. 4). .
[0068]
In attracting and holding the subject lens S1, the frame 64 is gradually lowered, and the four attracting means 66 are pressed against the convex surface a of the subject lens S1. At this time, since the curvature of the objective lens S1 is not constant in the progressive multifocal lens 1 or the multifocal lens 13 whose convex surface a is an aspherical surface, for example, the surface height of the suction position held by the suction means 66 is the same. Different from each other, the suction means 66 corresponding to the surface portion having the highest height first comes into contact with the surface portion to press the lens S1. Therefore, the slide member 67 of the suction means 66 rises against the tension coil spring 71, and the bent piece 76 moves upward from between the light emitting diode 74 and the light receiving diode 75 of the sensor 73 corresponding to the suction means 66. Evacuate. Therefore, the sensor 73 of the suction means 66 detects that the suction means 66 is pressed against the convex surface a of the lens S1 to be turned on when the light receiving diode 75 receives the light emitted from the light emitting diode 74. Then, this detection signal is sent to the control unit. When the control unit confirms the detection signal from the sensor 73, the frame 64 is further lowered by a predetermined amount (about 3 to 7 mm, which can adjust the height of each suction position on the lens curved surface) and the remaining three. The suction means 66 is pressed against the convex surface a of the lens S1 to be tested. For this reason, the sensors 73 of these three suction means 66 are also turned on to detect that the suction means 66 is pressed against the convex surface a, and this detection signal is sent to the control unit. When the control unit confirms that all the sensors 73 are in the ON state, the vacuum pump is operated to evacuate all the suction means 66. Thereby, the suction means 66 sucks and holds the convex surface a of the test lens S1.
[0069]
In this case, the suction means 66 is arranged so as to be movable up and down with respect to the frame 64, and is pressed against the convex surface a of the lens S1 by the spring force of the tension coil spring 71, so that the surface height of the suction position is different. Even in this case, all the suction means 66 can be pressed with a substantially constant pressing force. Therefore, it is possible to prevent the lens S1 from being damaged because the suction holding of the lens S1 is good.
[0070]
Further, since the lens mounting table 35 includes the lens support mechanism 88 (FIG. 5), the test lens S1 can be horizontally held by suction with respect to the suction means 66. That is, when the suction means 66 is pressed against the test lens S1, the ring 87 is compressed, so that the concave surface b of the test lens S1 is pressed against the support 96. At this time, when the test lens S1 is tilted, the support 96 on the opposite side to the tilt side is pushed down, so that the swing plate 92 and the swing ring 93 swing and the height of the support 96 is made equal. Then, the inclination of the test lens S1 is corrected. Therefore, the test lens S1 is held by suction in a horizontal state.
[0071]
Even after the suction and holding of the test lens S1 by the suction means 66 is completed, the vacuum pump continues to operate, the Z table stepping motor 52 is driven to raise the Z table 51, and the test lens S1 is placed on the lens mounting table 35. Lift up. When the test lens S1 is lifted above the lens mounting table 35, all the suction means 66 are pulled down by the force of the tension coil spring 71 and return to the original height. In this state, the X lens 40 is driven and the lens S1 to be sucked and held is conveyed above the mark detection position A3 and placed on the lens holding device 36, and the holding by the suction means 66 is released ( FIG. 6). Then, the vacuum exhaust chamber 105 and the inside of the lens support tube 100 are evacuated by the vacuum pump 101, the test lens S1 is sucked and fixed to the upper surface of the lens support tube 100, and the mark of the test lens S1 is detected.
[0072]
The image pickup processing device 130 and the power measurement device 131 are held in the origin return state 300 shown in FIG. 8 in the initial state before the mark detection or the lens power measurement. In the origin return state 300, the switching unit 140 and the focus correction lens 143 are retracted outside the optical path of the image pickup processing device 130. In addition, the light sources 135, 146, and 160 are all turned off.
[0073]
When the test lens S1 attracted and fixed to the upper surface of the lens support tube 100 is the progressive multifocal lens 1 shown in FIG. 11, the light source 135 for the progressive multifocal lens is turned on, the switching means 140 and the focus correction lens. Mark detection is performed in a state where 143 is retracted outside the optical path of the image pickup processing device 130 (301 in FIG. 8). At this time, the light sources 146 and 160 are turned off.
[0074]
When the light source 135 is turned on, the light illuminates the test lens S1, and an image of the convex surface on which the hidden marks 3A and 3B, the number 4 indicating the addition power, and the identification mark 5 are displayed is displayed on the condensing lens 102, The light is condensed by 103 and projected onto the reflective screen 145 by the imaging lens 144. When this projection image is reflected by the reflective screen 145, it passes through the original optical path and returns to the convex surface “a” side of the lens S 1, and is imaged on the imaging device 141 by the half mirror 138. Then, the image processing device 142 captures the image and processes the image, thereby detecting the hidden marks 3A and 3B, the number 4 and the identification mark 5 for displaying the addition power, and calculating the positions of the hidden marks 3A and 3B. Further, the lens on the left or right side is identified by the position of the numeral 4 indicating the addition power, and the type of the lens is detected by the identification mark 5. Further, the position of the geometric center O of the lens S1, the position of the eye point 11 and the like are calculated from the position information of the hidden marks 3A and 3B. Then, the processing center, the attachment angle around the axis of the lens holder 33 with respect to the lens S1, and the like are determined from the obtained lens information, lens frame shape data, and wearer's prescription data.
[0075]
On the other hand, when the test lens S1 is the multifocal lens 13 shown in FIG. 12, a light source 146 for the multifocal lens is used instead of the light source 135 for the progressive multifocal lens. Further, the focus correction lens 143 is inserted into the optical path between the half mirror 138 and the imaging device 141, and the focus of the imaging device 141 is adjusted to the convex surface a of the lens S1 (302 in FIG. 8). When the light source 146 is turned on, the light hits the reflection type screen 145 and is reflected and transmitted through the imaging lens 144 and the projection lenses 103 and 102. Then, the test lens S1 is irradiated from the concave surface 1b side and formed on the convex surface a side. The image of the upper edge 17 of the small ball 13 </ b> B is reflected by the half mirror 138 and guided to the imaging device 141. Then, the upper edge 17 is detected and the position is calculated by taking this image into the image processing device 142 and processing the image. Further, the position of the geometric center O, the eye point 16 and the like are calculated from the position information of the upper edge 17. Then, the processing center, the attachment angle around the axis of the lens holder 33 with respect to the lens S1, and the like are determined from the obtained lens information, lens frame shape data, and wearer's prescription data.
[0076]
When the mark detection of the test lens S1 is completed, the test lens S1 is sucked and held again by the suction means 66 and conveyed to the height / power measurement position A4, and is transferred to the cylindrical body 110 of the height measuring device 37 shown in FIG. Pressing from above, the height of the distance power measurement portion of the concave surface b of the test lens S1 is measured. When the height measurement is finished, the frequency is measured.
[0077]
When measuring the lens power of the lens S1, the focus correction lens 143 is moved out of the optical path of the image pickup processing device 130, and the switching means 140 is inserted into the optical path (303 in FIG. 8). In the measurement of the lens power, when the light source (light source image) 160 illuminates the transmission screen 167, the light emitted from the light source 160 becomes parallel light by the light transmission lens 161 and illuminates the pinhole plate 162 to the collimator lens 121. Finally, the light is condensed by the collimator lens 121 at the position of the concave surface b of the lens S1 to be tested to form a light source image. Then, this luminous flux becomes divergent light again, reaches the objective lens 166, and illuminates the transmission screen 167. On the other hand, in the image formation of the pinhole image 163 of the pinhole plate 162 on the transmission screen 167, when there is no power effect of the test lens (0.00D), the pinhole image 163 of the pinhole plate 162 is the collimator lens 121. Becomes parallel light, and a pinhole image is formed on the transmission screen 167 by the action of the objective lens 166. That is, when the LEDs 160a to 160d are sequentially turned on without the test lens S1 being installed in the optical path, the light is transmitted from the light transmission lens 161-pinhole plate 162 pinhole 163-collimator lens 121-mirror 165a-objective lens 166. -Mirror 165b-A pinhole image is projected on the transmission screen 167 through the mirror 165c. At this time, the pinhole plate 162 is held at the reference position so that the pinhole images when the LEDs 160a to 160d are turned on one by one are formed at substantially the same position. The pinhole image projected on the transmissive screen 167 passes through the transmissive screen 167 and is picked up by the image pickup device 141. The image processing device 142 captures this pinhole image and performs image processing, thereby the position of the pinhole image. Is calculated and stored as a reference position. When the test lens S1 is arranged, when the LEDs 160a to 160d are sequentially turned on one by one, the pinhole image is not formed at substantially the same position on the transmission screen 167, so that it is the same as a normal lens meter. It has a mechanism for moving and adjusting the pinhole plate 162 in the direction of the optical axis so as to form an image at substantially the same position.
[0078]
Next, when measuring the test lens S1, the LEDs 160a to 160d are sequentially turned on one by one by placing them on the height measuring device 37. At this time, since the light from the LEDs 160a to 160d is transmitted through the test lens S1, the position of the pinhole image from each LED projected on the transmission screen 167 is the lens power (optical characteristics) of the test lens S1. It is displaced from the aforementioned reference position by receiving the prism action according to)). And this pinhole image is imaged with the imaging device 141, and the image processor 142 performs image processing to calculate the displacement amount of the pinhole image for each of the LEDs 160a to 160d. That is, the pinhole plate 162 is moved and adjusted so that a pinhole image is formed at substantially the same position on the transmission screen 167, and the amount of movement of the pinhole plate 162 at this time is stored in the image processing device 142, and the pinhole image is stored. The lens power of the test lens S1 is calculated by converting the power from the amount of displacement and the amount of movement of the pinhole plate 162. The basic optical power calculation is the same as that disclosed in Japanese Patent Application Laid-Open No. 2-164428 by the present applicant.
[0079]
When the measurement of the lens power is completed, the Z table 51 is raised again and the suction means 66 holding the test lens S1 is transported above the block position A1. At this time, the X table 40 and the Y table 41 are moved and adjusted so that the processing center (eye point) of the lens S1 is substantially coincident with the center of the lens mounting table 35. Further, the test lens S1 is in a state of being lifted by several mm from the upper surface of the lens mounting table 35.
[0080]
Next, the lens holder 33 is conveyed above the test lens S1, the center is positioned at the processing center of the test lens S1, the lens holder 33 is vertically lowered from above and pressed against the convex surface a of the test lens S1, With the downward pressing force, the suction holding of the test lens S1 by the suction means 66 is released, and the test lens S1 is stuck to the elastic seal 34 from below while contacting and pressing the lens mounting table 35. Also at this time, the lens S1 is supported from below by the lens support mechanism 88 (FIG. 5), so that the lens S1 is not attached with an inclination, and the lens S1 can be well blocked. .
[0081]
When the lens holder 33 sucks and holds the subject lens S1 via the elastic seal 34, the state where the suction holding is released is confirmed by a sensor, and the suction means 66 is returned to the origin position A2. Then, the lens holder 33 is conveyed to the edging apparatus by the conveying robot, and the edging process of the lens S1 is performed.
[0082]
Next, a method for measuring the test lens S2 will be described.
When the spectacle lens measuring device 31 is in the initial state, the X table 172 is waiting at the origin position B2 (FIG. 1). In this state, the test lens S2 supplied to the lens layout block device is transported by an appropriate transport robot and placed on the lens placement table 35 (FIGS. 4 and 5) at the block position B1. When the test lens S2 is placed on the lens placement table 35, the X table stepping motor is driven to move the X table 172 waiting at the origin position B2 to the block position B1, and the suction means 180 is placed on the subject. It is positioned above the detecting lens S2. When the X table 172 stops at that position, the Z table 174 is lowered by driving the Z table stepping motor, and the suction means 180 is pressed against the convex surface a of the lens S2 to be sucked and held. The suction holding of the test lens S2 by the suction means 180 is exactly the same as the suction holding of the test lens S1 by the suction means 66 described above.
[0083]
When the suction and holding of the test lens S2 by the suction means 180 is completed, the Z table stepping motor is driven to raise the frame 179 and lift the test lens S2 above the lens mounting table 35, so that the height measurement position B3 is reached. Then, the test lens S2 is pressed against the lens receiving member 193 of the height measuring apparatus 190 shown in FIG. 9, and the height of the concave surface b of the test lens S2 is measured. This height measurement position is substantially the center of the concave surface b (preferably the center of the distance portion).
[0084]
  When the measurement of the height of the concave surface b of the test lens S2 is completed, the test lens S2 is raised again and conveyed above the power measurement position B4, and the lens power is measured by the power measuring device 200. This power measurement is performed while the lens S2 is held by suction by the suction means 180 as shown in FIG. At this time, the lens S2 to be measured is a partial measurement of the power measuring part of the concave surface bStandardThe height, specifically, the height that matches the focal point of the collimator lens 201 is maintained. In addition, since the frequency measurement by the frequency measurement apparatus 200 is performed similarly to the frequency measurement by the frequency measurement apparatus 131 described above, the description thereof is omitted.
[0085]
When the power measurement of the test lens S2 is completed, the test lens S2 is again raised to a predetermined height and transported to the block position B1, and transported above the lens mounting table 35. At this time, the X table 172 and the Y table 173 are moved and adjusted so that the processing center (optical center) of the test lens S2 is substantially coincident with the center of the lens mounting table 35. Further, the test lens S2 is in a state of being lifted by several mm from the upper surface of the lens mounting table 35.
[0086]
Next, the lens holder 33 is conveyed above the test lens S2, the center is positioned at the processing center of the test lens S2, the lens holder 33 is vertically lowered from above, and is pressed against the convex surface a of the test lens S2. With the downward pressing force, the suction holding of the test lens S2 by the suction means 66 is released, and the test lens S2 is stuck to the elastic seal 34 from below while contacting and pressing the lens mounting table 35. Also at this time, by supporting the test lens S2 from below by the lens support mechanism 88 (FIG. 5), the test lens S2 is not inclined and attached, and the test lens S2 can be well blocked. it can.
[0087]
When the lens holder 33 is attached to the test lens S2 via the elastic seal 34, the state where the suction holding is released is confirmed by the sensor, and the suction means 66 is returned to the origin position B2. Then, the lens holder 33 is transported to the edging apparatus by the transport robot to perform the edging process of the lens S2 to be examined.
[0088]
Thereafter, the lens holder 33 is transported above the test lens S2, the center is positioned at the processing center of the test lens S2, and the lens holder 33 is vertically lowered from above and pressed against the convex surface a of the test lens S2. Thus, the test lens S2 is attached to the elastic seal 34. When the lens holder 33 is attached to the test lens S2 via the elastic seal 34, the lens holder 33 is transported to the edging apparatus and the test lens S2 is edged.
[0089]
In implementing the present invention, various frequency measuring devices can be used.
[0090]
【The invention's effect】
As described above, the spectacle lens measurement method and apparatus according to the present invention perform power measurement in a state where the convex surface of the test lens is held by the lens holding and conveying device. There is no need to place it on the mounting table, so there is no risk of scratching the concave surface even if the lens to be measured is moved in the X and Y directions for power measurement, and the concave surface of the lens is measured. Therefore, power measurement can be performed satisfactorily even with lenses having different concave surface heights.
In addition, since the lens holding and conveying device is provided, it is possible to continuously perform lens mark detection, height measurement, and power measurement without intervention of an operator's hand. In addition, when measuring the concave surface height, it is only necessary to press the concave surface of the lens to be measured from above on the height measuring device, so that the concave surface is less likely to be scratched like the power measurement, and the height measurement can be performed satisfactorily. It can be carried out.
[Brief description of the drawings]
FIG. 1 is a diagram showing a positional relationship with a spectacle lens measuring apparatus according to the present invention.
FIG. 2 is a plan view of a main part showing an embodiment of a lens holding and conveying device for progressive multifocal and multifocal lenses.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a view showing an adsorption unit.
5A, 5B, and 5C are a plan view, a cross-sectional view, and a bottom view of a lens mounting table, respectively.
FIG. 6 is a cross-sectional view of a lens holding device.
[Fig. 7]It is a schematic diagram of an image pick-up processing device and a frequency measuring device.
[Fig. 8]It is a flowchart of an optical system.
FIG. 9It is a front view of the height measuring apparatus for single focus lenses.
FIG. 10It is a figure which shows the power measurement state of a single focus lens.
FIG. 11 is a diagram showing a positional relationship between a mark of a progressive multifocal lens, a geometric center, and the like.
FIG. 12 is a diagram showing a positional relationship between a small lens of a multifocal lens, a geometric center, an eye point, and the like.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 1 ... Progressive multifocal lens, 13 ... Multifocal lens, 30, 31 ... Measuring apparatus for spectacle lenses, 32 ... Lens holding conveyance apparatus, 33 ... Lens holder, 34 ... Elastic seal, 35 ... Lens mounting stand, 36 ... Lens holding Device: 37 ... Height measuring device, 130 ... Image capturing processing device, 131 ... Frequency measuring device, 140 ... Imaging device, 142 ... Image processing device, 170 ... Lens holding and conveying device, 190 ... Height measuring device, 200 ... Frequency Measuring device, A1 ... block position, A2 ... origin position, A3 ... mark detection position, A4 ... height and frequency measurement position, B1 ... block position, B2 ... origin position, B3 ... height measurement position, B4 ... frequency measurement position , S1, S2 ... Test lens.

Claims (5)

A lens holding and conveying device, a height measuring device, and a power measuring device;
A step of detecting that the suction member is pressed to a plurality of positions shifted from the geometric center of the convex surface of the lens to be tested that is a single focus lens by the lens holding and conveying device; and the test that is suctioned and held by the detection step The lens is conveyed above the height measurement position by the lens holding / conveying device, is lowered from a predetermined reference height position, and the height measurement is performed by detecting time until the sensor detects the concave surface of the lens to be examined. A step of measuring the concave surface height by an apparatus, and a step of transporting the lens to be measured above the power measuring position by the lens holding and transporting device so that the power measuring portion of the concave surface becomes a measurement reference height position. A method for measuring a spectacle lens, comprising the step of adjusting the height of the concave surface obtained by the step and measuring the power of the lens to be measured by the power measuring device. A lens holding and conveying device, an image pickup processing device, a height measuring device, and a power measuring device;
A step of detecting that the suction member is pressed to a plurality of positions shifted from the geometric center of the convex surface of the test lens composed of a progressive multifocal lens or a multifocal lens by the lens holding and conveying device; and the suction holding by the detection step The lens to be tested is transported above the mark detection position by the lens holding and transporting device, the mark formed on the convex surface of the lens to be tested is imaged by the image capturing processing device, and the captured image Calculating the lens type, the left / right identification result of the lens and the power measurement position from the information, and transporting the test lens sucked and held by the detection process above the height measurement position by the lens holding and conveying device; its concave by the height measuring device sensor is lowered from a predetermined reference height position by detecting the time to detect the concave of the lens A step of measuring the height, and the lens holding and conveying device conveys the lens to be measured above the power measurement position so that the concave power measurement position obtained in the calculation step becomes the measurement reference height position. A method for measuring a spectacle lens, comprising a step of adjusting the height of the concave surface obtained by the measuring step and measuring the power of the lens to be measured by the power measuring device. A measuring device for a single focus lens for measuring the optical characteristics of the single focus lens;
A progressive multifocal lens or a multifocal lens mark and a multifocal lens measuring device for measuring optical characteristics;
The single-focus lens measuring device includes: a detecting unit that detects that the suction member is pressed against a plurality of positions shifted from the geometric center of the convex surface of the single-focus lens; and the height measurement position of the single-focus lens held by suction. A lens holding and conveying device that conveys above the frequency measuring position, a height measuring device that measures the concave surface height of the single focus lens, and a frequency measuring device that measures the frequency,
The multifocal lens measuring device includes a progressive multifocal lens that detects that the suction member is pressed against a plurality of positions shifted from the geometric center of the convex surface of the progressive multifocal lens or the multifocal lens, and the progressive multifocal lens held by suction. Alternatively, the lens holding and conveying device that conveys the multifocal lens above the mark detection position and the height and power measurement position, and the progressive multifocal lens or the mark formed on the convex surface of the multifocal lens is imaged and the image is processed An image pickup processing device for detecting the lens type, detecting the left / right identification of the lens and calculating the power measurement position, and measuring the height of the concave surface of the test lens disposed at the height / power measurement position. the apparatus and frequency have a frequency measurement device for measuring,
The height measurement device of the single focus lens measurement device and the multifocal lens measurement device lowers the suction member holding the test lens by driving a motor from a predetermined reference height position to detect the sensor. A spectacle lens measuring device, wherein the height of the concave surface of the lens to be measured is measured by detecting the time until the concave surface of the lens is detected as the number of pulses applied to the motor . In the measurement method of the spectacle lens according to claim 1,
  A method for measuring a spectacle lens, comprising: measuring a lens power after measuring a concave surface height of a lens to be measured, and moving the lens to a power measurement position to make a height reference position at the time of measurement constant. . In the measuring method of the spectacle lens according to claim 2,
  After measuring the concave surface height of the test lens, the spectacle lens is measured by returning the test lens to the reference height position again and measuring the lens power while keeping the height reference position constant at the time of measurement. Method.

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