JP2007114645A - Method for working external shape of optical lens and optical lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and surely achieve discrimination between the front surface and the back surface of an optical lens by a small number of processes in an optical lens external shape working method for working the external shape of an optical lens and the optical lens. <P>SOLUTION: In the optical lens external shape working method for obtaining the optical lens having the external shape in a predetermined form by machining the outer periphery of lens material having similar irregular forms on its front surface and back surface, a front/back surface discrimination part for achieving the discrimination between the front surface and the back surface is provided by working on the outer periphery of the optical lens in such machining. In the optical lens constituted by machining the outer periphery of the lens material having the similar irregular forms on the front surface and the back surface to be the external shape in the predetermined form, the front/back surface discrimination part for achieving the discrimination between the front surface and the back surface and formed in such machining is provided on the outer periphery of the optical lens. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical lens outer shape processing method and an optical lens for processing an outer shape of an optical lens.

Conventionally, for example, in an optical lens for a wearable display, the outer periphery of a lens material formed in a circular shape is processed by machining to obtain a rectangular optical lens. In this optical lens, since the concave and convex shapes on the front and back surfaces are similar, a mark is marked with magic ink on one side of the machined surface to discriminate the front and back surfaces of the optical lens. ing.
JP 2004-205697 A

However, in the method of marking the front and back surfaces of the optical lens by marking one side of the processed surface of the optical lens with magic ink, it is necessary to be careful not to mark the lens surface. There is a problem that a great number of man-hours are required and the mark may disappear.
The present invention has been made to solve such a conventional problem, and provides an optical lens outer shape processing method and an optical lens that can be easily and surely discriminated between the front and back surfaces of the optical lens with less man-hours. The purpose is to do.

The external processing method of the optical lens of the first invention is the optical lens external processing method for obtaining an optical lens having a predetermined external shape by machining an outer periphery of a lens material having similar concave and convex shapes on the front and back surfaces. At the time of machining, a front / back surface discriminating unit for discriminating between the front and back surfaces is processed on the outer periphery of the optical lens.
The optical lens outer shape processing method of the second invention is the optical lens outer shape processing method of the first invention, wherein the optical lens having the predetermined shape is a rectangular optical lens, A front and back surface discrimination part is formed.

The optical lens outer shape processing method of the third invention is the optical lens outer shape processing method of the second invention, wherein chamfered portions having the same shape are formed at the three corners of the rectangular optical lens, and the remaining 1 The front and back surface discrimination part having a shape different from the shape of the chamfered part is formed at a corner.
An optical lens according to a fourth aspect of the present invention is an optical lens obtained by machining the outer periphery of a lens material having similar concave and convex shapes on the front and back surfaces into a predetermined shape, and is formed on the outer periphery of the optical lens during the machining. It has a front and back side discrimination part for discriminating the front and back sides.

An optical lens according to a fifth aspect of the present invention is the optical lens according to the fourth aspect of the present invention, wherein the optical lens formed by machining into the predetermined outer shape is a rectangular optical lens, and the front and rear surface discriminating portion is provided at a corner of the optical lens. It is characterized by having.
An optical lens according to a sixth aspect is the optical lens according to the fifth aspect, wherein chamfered portions having the same shape are formed at three corners of the rectangular optical lens, and the chamfered portion is formed at the remaining one corner. The front / back surface discrimination part having a shape different from the shape is formed.

In the optical lens outer shape processing method of the present invention, when the outer periphery of the lens material is machined, the front and back surface discriminating portion for discriminating the front and back surfaces is processed on the outer periphery of the optical lens. The front and back surfaces of the lens can be easily and reliably discriminated.
In the optical lens according to the present invention, the front and back surfaces of the optical lens are discriminated easily and surely because the front and back surfaces of the optical lens are formed on the outer periphery of the optical lens to discriminate the front and back surfaces. be able to.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 shows a first embodiment of the present invention.
In this embodiment, the present invention is applied to an optical lens 11 for a wearable display. As shown in FIG. 1A, the optical lens 11 is configured by sandwiching two different resin layers 11c and 11d between two resin-molded plastic lenses 11a and 11b. The convex shape of the front surface R1, which is one surface of the optical lens 11, and the rear surface R2, which is the other surface, is similar.

The optical lens 11 is obtained by machining the outer periphery of a circular lens material 13 as shown in FIG. 2B to form a rectangular shape indicated by a broken line. As shown in FIG. 2A, the lens material 13 is formed by sandwiching two different resin layers 13c and 13d between two resin-shaped circular plastic lenses 13a and 13b. .
In this embodiment, the outer diameter R of the circular lens material 13 is 22 mm. The rectangular optical lens 11 has a horizontal width W1 of 18 mm and a vertical width W2 of 14 mm.

  As shown in FIG. 1B, chamfered portions M1, M2, and M3 having the same shape are formed at the three corners excluding the upper left corner of the rectangular optical lens 11. In addition, a front / back surface determination portion H having a shape different from the shapes of the chamfered portions M1, M2, and M3 is formed in the upper left corner. In this embodiment, the chamfered portions M1, M2, and M3 have a so-called R chamfer shape with a radius r of 4.7 mm. Moreover, the shape of the front / back surface discrimination | determination part H is what is called C chamfering shape whose length of the side which inclines at 45 degree | times is 5 mm.

FIG. 3 shows a ball grinder for external machining for machining the outer periphery of the above-described circular lens material 13 into a rectangular external shape.
The ball grinder has a work holding unit 15 and a processing unit 17.
The work holding part 15 has a pair of chuck shafts 19 arranged in series. The pair of chuck shafts 19 are rotatably supported. Tightening portions 21 are disposed at the opposite ends of the pair of chuck shafts 19, respectively. A chuck board 23 is disposed inside the tightening portion 21. The chuck board 23 is movable in the axial direction of the chuck shaft 19 by rotating the fastening portion 21 with respect to the chuck shaft 19. The lens material 13 is fixed between the pair of chuck boards 23 by rotating the tightening portion 21 in a state where the lens material 13 is inserted between the pair of chuck boards 23.

The processing unit 17 includes a grindstone shaft 25 that is disposed in parallel to the chuck shaft 19. The grindstone shaft 25 holds a grinding grindstone 27 that grinds the outer periphery of the lens material 13. For the grinding wheel 27, for example, an electrodeposition grindstone is used.
The work holding unit 15 includes a rotation mechanism (not shown) that rotates the chuck shaft 19 to rotate the lens material 13. And the workpiece holding part 15 is movable toward the grinding wheel 27 side by a forward and backward feed mechanism (not shown). In addition, it can be moved in the vertical direction (direction perpendicular to the paper surface) by a vertical feed mechanism (not shown). In this embodiment, an NC controller is used as the ball grinder, and driving of a rotation mechanism (not shown), a forward / backward feed mechanism (not shown), a vertical feed mechanism (not shown), etc. is predetermined. Based on the program.

In this ball grinder, the lens material 13 is fixed between a pair of chuck disks 23, and the workpiece material 15 is moved in the vertical direction with respect to the grinding wheel 27 while the grindstone shaft 25 is rotated. The outer periphery of 13 is ground into a rectangular shape.
FIG. 4 shows an example of grinding of the lens material 13 by a ball grinder. In this example, the optical lens 11 shown in FIG. 1 includes a straight portion L1, a chamfered portion M1, a straight portion L2, a chamfered portion M2, a straight portion L3, a front / back surface discriminating portion H, a straight portion L4, and a chamfered portion M3. It is processed sequentially in this order.

  First, as shown in FIG. 4A, the straight line portion L1 is processed on the outer periphery of the circular lens material 13. Next, as shown in FIG. 4B, the chamfered portion M1 is processed continuously to the linear portion L1. Next, the straight line portion L2, the chamfered portion M2, and the straight line portion L3 are sequentially processed, and processing is performed up to the front and back surface determination portion H as shown in FIG. Next, as shown in FIG. 4 (d), the front / back surface discrimination portion H is continuously processed during a series of processing of the outer peripheral portion. Then, as shown in FIG. 4E, the straight line portion L4 and the chamfered portion M3 are processed, and the optical lens 11 shown in FIG. 1 is obtained.

  The above-described processing of the straight portions L1, L2, L3, L4, the chamfers M1, M2, M3, and the front / back surface determination portion H is based on a predetermined NC program, a turning mechanism (not shown), This is performed by controlling the driving of a front / rear feed mechanism (not shown) and a vertical feed mechanism (not shown) and moving the work holding portion 15 in the front / rear and up / down directions while rotating the lens material 13. In this NC program, each mechanism is controlled so that only one of the four corners has a different locus from the other corners during the outer peripheral machining.

  Since the optical lens 11 described above has the front and back surface discrimination part H for discriminating between the front surface R1 and the back surface R2 on the outer periphery of the optical lens 11, the front surface R1 and the back surface R2 of the optical lens 11 can be easily provided. It can be made surely distinguishable. That is, in this embodiment, when the front / back surface discrimination portion H formed on the optical lens 11 is positioned so as to be positioned at the upper left corner as shown in FIG. The surface becomes the surface R1.

When the outer periphery of the optical lens 11 is processed, the front / back surface discrimination portion H is machined in a series of steps for processing the chamfered portions M1, M2, and M3. The man-hour can be reduced as compared with the above. Moreover, since the front / back surface discrimination | determination part H is formed by machining, the front / back side discrimination | determination part H does not lose | disappear.
In this embodiment, since the front and back discriminating portion H is formed at the corner of the rectangular optical lens 11, it is possible to effectively prevent the front and back discriminating portion H from affecting the observation optical system. Can do.

Further, the front surface R1 and the rear surface R2 of the optical lens 11 can be easily and reliably discriminated.
(Second Embodiment)
FIG. 5 shows a second embodiment of the present invention. In addition, in this embodiment, the same code | symbol is attached | subjected to the part same as 1st Embodiment, and detailed description is abbreviate | omitted.

  In this embodiment, chamfered portions M having the same shape are formed at three corners excluding the upper right corner of the rectangular optical lens 11A. In addition, a front / back surface determination portion HA having a shape different from the shape of the chamfered portion M is formed in the upper right corner. In this embodiment, the shape of the chamfered portion M is a so-called R chamfered shape with a radius r of 2 mm. The shape of the front / back surface discrimination portion HA is a so-called R chamfered shape with a radius r1 of 5 mm.

In this embodiment, when the front / back surface discrimination portion HA formed on the optical lens 11A is positioned so as to be positioned at the upper right corner as shown in FIG. Becomes the surface R1.
Also in this embodiment, substantially the same effect as that of the first embodiment can be obtained.
(Supplementary items of the embodiment)
As mentioned above, although this invention was demonstrated by embodiment mentioned above, the technical scope of this invention is not limited to embodiment mentioned above, For example, the following forms may be sufficient.

(1) In the above-described embodiment, the example in which the front and back surface discrimination portions H and HA are processed at the corners of the rectangular optical lenses 11 and 11A has been described. For example, an arc-shaped concave portion is formed in the linear portion of the optical lens. It is good also as a front and back surface discrimination | determination part by processing.
(2) In the above-described embodiment, the example in which the front and back discriminating portions H and HA are processed at one corner of the rectangular optical lenses 11 and 11A has been described, but the front and back discriminating portions are processed at two or more locations. You may do it.

(3) In the above-described embodiment, the example in which the ball grinder is an NC controller has been described. However, for example, a copying machine may be used.
(4) In the above-described embodiment, the example in which the outer periphery of the lens material 13 is processed by the ball grinder has been described. However, for example, the lens material 13 may be processed by a general-purpose NC grinder or the like.
(5) In the above-described embodiment, the example in which the present invention is applied to the rectangular optical lenses 11 and 11A has been described. However, the present invention can be applied to optical lenses having various shapes.

  (6) In the above-described embodiment, the example in which the present invention is applied to the wearable display optical lenses 11 and 11A has been described. However, the present invention can be widely applied to optical lenses obtained by processing lens materials.

It is explanatory drawing which shows 1st Embodiment of the optical lens of this invention. It is explanatory drawing which shows the lens raw material of the optical lens of FIG. It is explanatory drawing which shows the ball grinder used for the process of the lens raw material of FIG. It is explanatory drawing which shows the process process of the lens raw material by the ball grinder of FIG. It is explanatory drawing which shows 2nd Embodiment of the optical lens of this invention.

Explanation of symbols

11, 11A: Optical lens, 13: Lens material, R1: Front side, R2: Back side, M1, M2, M3: Chamfered part, H, HA: Front and back side discriminating part.

Claims (6)

In the outer shape processing method of the optical lens, by machining the outer periphery of the lens material having similar concave and convex shapes on the front and back surfaces, an optical lens having an outer shape of a predetermined shape is obtained.
A method of processing an outer shape of an optical lens, wherein a front / back surface discriminating unit for discriminating the front / back surface is processed on the outer periphery of the optical lens during the machining. The optical lens outer shape processing method according to claim 1,
The optical lens outer shape processing method, wherein the optical lens having an outer shape of a predetermined shape is a rectangular optical lens, and the front and rear surface discrimination portions are formed at corners thereof. In the optical lens outer shape processing method according to claim 2,
An optical device characterized in that chamfered portions having the same shape are formed at three corners of the rectangular optical lens, and the front and back surface distinguishing portions having shapes different from the shape of the chamfered portion are formed at the remaining one corner. Lens external processing method. In the optical lens formed by machining the outer periphery of the lens material having similar concave and convex shapes on the front and back surfaces into an outer shape of a predetermined shape,
An optical lens comprising a front and back discriminating section formed on the outer periphery of the optical lens for discriminating the front and back sides at the time of machining. The optical lens according to claim 4.
The optical lens machined into the predetermined outer shape is a rectangular optical lens, and has the front and back discriminating portions at corners thereof. The optical lens according to claim 5.
Chamfered portions having the same shape are formed at the three corners of the rectangular optical lens, and the front and back surface distinguishing portions having a shape different from the shape of the chamfered portion are formed at the remaining one corner. An optical lens.

Images