JP2000028887A - Device and method for fixing lens in frame body and lens with frame body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for fixing a lens in a frame body and the lens with the lens frame body by which the deviation of an axial center is not caused between the lens and the lens frame body at the time of fixing the lens with high accuracy, required accuracy such as lens concentricity can be satisfied and high accuracy is not required in the working dimension of the lens and the lens frame body. SOLUTION: This device is equipped with a fixed mold 12 holding a lens frame body 1 in an immovable state and a movable mold 3 equipped with a heating surface 3a receiving heat for thermally melting a pawl part 1c by abutting on and separating from a heating part 16 and moved along the axial core line of the lens 2. Three form parts 3b holding the lens surface edge part of the lens 2 and thermally melting the pawl part 1c so as to move toward the axial core CL of the lens are formed nearly at equal intervals on the heating surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for fixing a lens to a frame, a method for fixing a lens to a frame, and a lens with a frame, and particularly to a lens frame made of a thermoplastic resin in assembling an optical lens unit. And a technology for fixing a lens to the lens.

2. Description of the Related Art As an example of a conventional method of fixing a lens to a lens frame, the present applicant has proposed in Japanese Patent Publication No. 58-42442. In this figure, a lens positioning step 101b is integrally formed on a part of an inner peripheral wall 101a of a lens frame 101 formed of a thermoplastic resin, and this lens positioning step 101b is used. Then, the lens 102 is housed, and the lens holding claw 101c formed in an encircling shape at the end of the inner peripheral wall of the frame body is heated and melted. The lens 102 is housed in the lens frame and fixed to the lens 102 by close contact molding with a part thereof.

For this purpose, a lens mounting die 103, which is heated to melt the lens holding claw, is provided so as to be movable downward, and after the mold 103 is lowered, the lens holding claw 101c is completely moved. As shown in the figure, a uniform mold surface 103a is formed in the entire circumferential direction for uniform close contact molding in the circumferential direction.

[0003] In FIG.
The illustration of a heat source for heating 03 is omitted. Reference numeral 104 denotes a cooling air pipe for cooling the lens mounting die 103 after the lens frame is formed, and reference numeral 105 denotes a cooling air escape hole formed on the outer peripheral surface of the lens mounting die 103. .

[0004]

On the other hand, in recent years, an optical lens unit in a video device such as a camera has been required to be mounted on a lens frame with higher accuracy at the time of assembling the lens unit due to downsizing, high magnification zoom, and the like. There is a demand for fixing lenses. In particular, it is necessary to fix the lens axis so that the axis of the lens frame coincides with the axis of the lens frame as much as possible in order to improve the performance of the lens unit.

However, according to the above-described conventional example, the play of the lens caused by the clearance (clearance) existing between the lens and the lens frame, that is, the deviation of the axis between the lens and the lens frame is corrected. Instead, the lens was fixed by melting the lens frame. For this,
In some cases, the required accuracy such as the lens coaxiality cannot be satisfied, and in some cases, the coaxiality or the like is evaluated after fixing the lens, and only those within the accuracy are selected and used.

In view of this situation, a method of eliminating the gap between the lens and the lens frame, that is, pressing the lens into the lens frame to eliminate backlash has been adopted. According to this, a large pressure input may be required due to variations in the dimensional tolerance of the lens and the lens frame, so that the lens frame itself may be deformed and accuracy may be deteriorated. In addition, according to this press-fitting method, there is a problem that workability at the time of assembling the lens is poor, and further, in order to stabilize the press-fitting process, higher precision is required depending on the processing dimensions of the lens and the lens frame.

Therefore, the present invention has been made in view of the above-described problems, and when fixing a lens to a lens frame that requires high accuracy, the axis of the lens and the lens frame is fixed. A method for fixing a lens to a lens frame, a device for fixing a lens to a frame, and a method that does not cause displacement, satisfy required accuracy such as lens coaxiality, and do not require high precision in processing dimensions of a lens and a lens frame. The purpose is to provide a lens with a frame.

[0008]

According to the present invention, a step for positioning a lens is provided on an inner peripheral wall of a lens frame made of a heat-fusible material. The lens base is housed in order to fix the edge of the lens and fix it to the lens frame by thermally melting an encircling claw portion continuously formed from the step portion. A fixed type fixed to the device base and holding the lens frame in an immovable state; a heating unit fixed to the device base; and a contact and separation with the heating unit. A lens fixing device for a frame body including a heating surface that receives heat for thermally melting the claw portion, and a movable body that is moved along an axis of the lens frame body and the lens, Holding the lens surface edge of the lens, the claw portion The shape of at least three is thermally fused so as to move in the axial center direction of the lens, and characterized in that formed at substantially equal intervals on the heating surface.

[0009] Further, the present invention is characterized in that the shape portion is formed from a protrusion having a protrusion shape. Further, at the time when the claw portion is thermally melted, the diameter of an inscribed circle connecting the portions that come into contact with the claw portion is the sum of the outer shape of the lens and twice the thickness of the claw portion. It is characterized by being extended so as to be set smaller.

A step for positioning the lens is provided on the inner peripheral wall of the lens frame made of a heat-fusible material, the lens is accommodated on the step, and an encircling shape continuously formed from the step. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claws, the device base is fixed to the device base and the lens frame is immobilized. A fixed die, a heating means fixed to the base of the device, and a heating surface for receiving heat for melting the claw portion by contacting and separating from the heating means, and the lens A lens fixing device for a frame having a frame and a movable die that is moved along the axis of the lens, wherein the fixed die presses and holds an outer peripheral edge of the lens. Move the claw in the axial direction of the lens It is characterized in that a lens holding means that.

Further, the lens holding means is maintained in a state of sneaking into a relief portion formed at equal intervals in the lens frame and a state of being retracted.

Further, the lens holding means is maintained in a state in which it penetrates through holes formed at equal intervals in the outer peripheral surface of the lens frame and in a state in which it is retracted.

[0013] Further, the lens holding means is characterized in that the lens holding means is maintained in a state of infiltrating into bottomed holes formed at equal intervals on the outer peripheral surface of the lens frame and in a state of being retracted.

Further, a step for positioning the lens is provided on the inner peripheral wall of the lens frame made of a heat-fusible material, the lens is accommodated on the step, and an encircling shape formed continuously from the step. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claw, the lens frame is held in an immovable state by a fixed die fixed to the device base. A heating surface for receiving heat for thermally melting the claw by abutting and separating from a heat generating means fixed to the device base so as to move along the axis of the lens frame and the lens; A method for fixing a lens to a frame, which moves by a mold and fixes a lens to a lens frame, wherein the claw portion is substantially melted so as to move in the axial direction of the lens. With at least three shapes formed at equal intervals The lens surface edges of the lens was heat-melted by pressing and holding is characterized by taking out after curing.

In the method of fixing a lens to a frame,
The above-mentioned shape part is formed from a projection part of a projection shape.

In the method for fixing a lens to a frame,
At the time of melting the claw portion by heat,
The method is characterized in that an inscribed circle diameter connecting a portion abutting on the claw portion is extended so as to be set smaller than a sum of twice the outer shape of the lens and the thickness of the claw portion.

Further, a step for positioning the lens is provided on the inner peripheral wall of the lens frame made of a heat-fusible material, the lens is accommodated on the step, and an encircling shape continuously formed from the step. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claw, the lens frame is held in an immovable state by a fixed mold fixed to the device base. A movable mold having a heating surface for receiving heat for thermally melting the claw portion by coming into contact with and separating from a heat generating means fixed to the device base; A lens fixing device for fixing the lens to a frame that is thermally melted by moving along the outer periphery of the claw. Moving the lens in the axial direction of the lens It is characterized by the fusion.

Further, the lens holding means is maintained in a state of sneaking into a relief portion formed at equal intervals in the lens frame and a state of being retracted.

Further, the lens holding means is maintained in a state in which it penetrates through holes formed at equal intervals on the outer peripheral surface of the lens frame and in a state in which it is retracted.

Further, the lens holding means is characterized in that it is maintained in a state of infiltrating into a bottomed hole formed at equal intervals on the outer peripheral surface of the lens frame and in a state of being retracted.

Also, a step for positioning the lens is provided on the inner peripheral wall of the lens frame made of a heat-fusible material, the lens is accommodated on the step, and an encircling shape formed continuously from the step. By fusing the claw portion thermally, in order to restrain the edge of the lens and fix it to the lens frame, the lens frame is held immovably in a fixed mold fixed to the device base, A movable surface that receives heat for thermally melting the claw portion by coming into contact with and separating from heat generating means fixed to the device base, so as to be along the axis of the lens frame and the lens. A lens with a frame that moves and fixes the lens to the lens frame, and is formed at substantially equal intervals on the heating surface to heat-melt the claws so as to move in the axial direction of the lens. The at least three shaped parts provided And hot melt by pressing and holding the lens surface edges, is characterized by taking out after curing.

A step portion for positioning the lens is provided on the inner peripheral wall of the lens frame made of a heat-fusible material, the lens is accommodated on the step portion, and an encircling shape continuously formed from the step portion is provided. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claw, the lens frame is held in an immovable state by a fixed mold fixed to the device base. A movable mold having a heating surface for receiving heat for thermally melting the claw portion by coming into contact with and separating from a heat generating means fixed to the device base; A lens with a frame that melts by moving along the lens, wherein the lens holding means disposed on the fixed mold presses and holds the outer peripheral edge of the lens, and holds the claw portion with the lens. Heat-melt by moving in the axial direction of the lens. It is characterized in that.

[0023]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1A is a cutaway view of a main part according to the first embodiment, and FIG. 1B is a cutaway view of a main part showing a state after fixing.

In FIG. 1A, reference numeral 1 denotes a lens frame,
Reference numeral a denotes a peripheral wall portion of the lens frame, 1b denotes a lens positioning step formed on the peripheral portion of the lens frame, and 1c denotes a lens pressing claw portion formed to be bent at the inner peripheral wall end of the frame. Reference numeral 3 denotes a lens melting mold for melting and molding the lens holding claw 1c.

Reference numeral 3a denotes an inner peripheral surface serving as a molding surface;
b denotes at least three protrusions formed on a part of the inner peripheral surface 3a. Reference numeral 4 denotes a cooling air pipe for cooling the lens mounting die after the lens frame is formed. Reference numeral 5 denotes an escape hole for the cooling air formed in the lens mounting die 3, and reference numeral 6 denotes a lens mounting die. Thermocouple attached to measure the temperature of the

FIG. 1B shows a state in which the lens 2 is housed in the lens frame 1 and the lens holding claw 1c is melt-molded, that is, a state in which the lens is fixed to the lens frame. I have.

FIG. 2A is a sectional view taken along line XX of FIG.
FIG. 2 is a cross-sectional view taken along an arrow, showing a bottom view of the lens fusion mold 3. As shown in FIG. 2 (a), the projections 3b formed on a part of the inner peripheral surface 3a have a uniform pitch of 120.
It is located in three places each time. FIG. 2B is a cross-sectional view taken along the line AA of FIG.
The details are shown. Further, FIG. 2C shows FIG.
5 is a view taken along the line AA of FIG.

FIG. 3 is a fragmentary cutaway view showing the overall configuration of the lens fixing device in which the components shown in FIG. 1 are arranged.

In FIG. 3, reference numeral 11 denotes a lower frame, on which a lens frame support 12 is mounted. The lens frame support 12 has an inner diameter wall 12a substantially equal to the outermost diameter of the lens frame 1, so that the lens frame 1 can be positioned without play.
Reference numeral 13 denotes a lens frame upper surface pressing piece which is slidably provided in a lens frame axial direction CL via a slide unit 14 and is located at a position where the lens frame upper surface is pressed during the lens fixing operation. When the lens frame 1 is detached from the lens frame support 12 after the work is completed, the lens frame 1 is retracted from the upper surface of the lens frame.

Reference numeral 15 denotes an upper frame, and 16 denotes a ring-shaped heat source unit mounted on the upper frame 15, which houses a heater and is connected to an external power source via terminals (not shown) or the like and is energized. . The lower surface 16 of the heat source unit 16
"a" is smoothed and arranged so as to be able to be in close contact with the above-mentioned lens melting mold upper surface 3c which is similarly smoothed. In addition, all outer surfaces of the heat source unit 16 other than the lower surface 16a are covered with a heat insulating structure 16b. Reference numeral 17 denotes an air tube connected to the cooling air pipe 4 and connected to a cooling air control device (not shown). Reference numeral 18 denotes a temperature controller for monitoring the output from the thermocouple 6, and the output from the thermocouple 6 is transmitted to the cooling air control device so that the shutoff of the cooling air can be controlled based on the monitored temperature. Reference numeral 19 denotes an up-down moving shaft, the lower end of which is a screw melting mold
The upper end is attached to an up-down movement driving device (air-silling) (not shown), and is vertically movably engaged with an up-down movement bearing 21 attached to the upper base 15. . 22 is a vertical moving bearing 2
The long groove 23 formed in 1 is a pin set on the vertical movement shaft 19, and is configured so that the lens melting mold 3 can move up and down and cannot move in the rotation direction. The lens frame support 12, the vertical moving bearing 22, the vertical moving shaft 19, and the lens melting mold 3 have the central axis C.
It is assembled and adjusted on the lower gantry 11 or the upper gantry 15 so that L matches.

Next, the operation of the lens fixing operation according to the configuration shown in FIGS. 1 to 3 will be described.

First, in the lens fixing operation, first, the lens frame 1 is inserted into the lens frame support base 12 so as to fit, and then the lens frame upper surface pressing piece 13 is operated.
The lens frame 1 is locked so as not to come off.

On the other hand, before the lens fixing operation, the lens melting mold 3 is held in advance so that the upper surface 3c is in close contact with the lower surface 16a of the heat source unit 16, and the lens pressing claw 1c of the lens frame 1 is melt molded. It is warmed to a temperature sufficient to (The above state is shown in FIG. 3.) Next, the vertical driving device (not shown) is activated to lower the lens melting mold 3 so as to separate it from the heat source unit 16. At this time, among the respective portions of the heated lens melting mold 3, first, the projection-shaped portion 3 b formed on a part of the inner peripheral surface 3 a first comes into contact with the lens holding claw 1 c of the lens frame 1. Then, the inner peripheral surface 3a, which is the entire molding surface, comes into contact. Then, after the lens melting mold 3 reaches the lower end,
It is maintained for a time sufficient for melt-molding the lens pressing claw 1c of the lens frame 1. Thereafter, a cooling air control device (not shown) is activated, and the cooling air is supplied to the air tube 17,
It is introduced into the lens melting mold 3 through the cooling air pipe 4.

The cooling air introduced in this way is released to the atmosphere through a cooling air escape hole formed in the lens melting mold 3, whereby the lens melting mold 3 is rapidly cooled. The temperature of the lens melting mold 3 is monitored by the thermocouple 6 and the temperature controller 18, and when the temperature reaches a certain fixed temperature, the temperature controller outputs a signal indicating the end of cooling to the cooling air control device, and the air cooling is stopped. .

In this air cooling step, after the lens pressing claw portion 1c is melt-molded by the lens melting die 3, the lens melting die 3 can be properly released from the lens pressing claw portion 1c. In other words, this step is necessary for maintaining the shape and the surface condition of the formed lens pressing claw portion 1c in a good condition.

After the cooling step is completed, the lens melting mold 3 is raised by a vertical driving device (not shown), and the upper surface 3c
Is stopped again at the position where it comes into close contact with the lower surface 16a of the heat source unit 16. As a result, heating of the lens melting mold 3 is started in preparation for the next lens fixing operation. On the other hand, on the lens frame support 12, the lens frame top holding piece 13 is actuated to release the locking of the lens frame 1, and the lens frame 1 with the fixed lens is removed from the lens frame support 12.
And a series of lens fixing operations is completed.

Through the steps described above, the shape of the lens frame 1 as the target work can be realized without any change from the conventional method. That is, only by partially changing the shape of the lens fusion tool, which is a lens fixing tool, a lens fixing operation in which the axes of the lens and the lens frame are made to coincide with each other with higher precision than before can be performed.

FIG. 4 is a fragmentary cutaway view showing a modification of the lens fusion mold of the second embodiment. The same reference numerals are given to the already described components, and the description will be omitted. Differences between the mold 3 and the lens frame 1 are indicated by circles in the figure.

In this figure, reference numeral 3b denotes at least three projecting portions formed on a part of the inner peripheral surface 3a of the lens melting mold 3, which is further below the lower surface 3d of the lens fixing frame as shown. , And the inner side surface portion 3e has an inclination of about 20 to 40 degrees with respect to the vertical direction.

Reference numeral 1d denotes a cut-out portion in the lens frame 1, which is a relief portion for allowing the projection portion 3b of the lens fusion type to enter during the lens fixing operation.

According to the above configuration, it is necessary to change a part of the shape of the lens frame 1 as a work. However, in comparison with the above-described first embodiment, the lens frame 1 is faster in fixing the lens. At the timing, the projection portion 3b of the lens melting type comes into contact with the lens holding claw 1c of the lens frame. In addition, the protruding portion 3b is formed on the inner surface 3e.
In addition to having a tilt of about 20 to 40 degrees with respect to the vertical direction, it is possible to more effectively generate a force that pushes the lens holding claw 1c of the lens frame to the inside, that is, to the inside of the lens. Become.

As described above, in addition to the conventional function of holding the lens, the function of moving the lens in the direction of its axis, that is, the function of centering, can be provided to the lens melting mold in the lens fixing operation. With one operation of fixing the lens equivalent to that described above, the lens can be fixed while centering the lens in the play with the lens frame. Accordingly, it is possible to easily realize the lens fixing that makes the axes of the lens and the lens frame coincide with each other with high accuracy.

Further, the lens fusion type can be realized without largely changing the conventional shape, and other than this lens fusion type, it is possible to realize a more accurate lens fixing by utilizing the conventional lens fixing device as it is. become. In addition, since the shape required to realize the functions of lens holding and lens centering was concentrated in one location of the lens fusion mold,
Even if the target lens shape changes, in the lens fixing device,
It can be handled by changing only this lens fusion mold,
It is possible to apply a high-precision lens fixing method to other lenses at low cost in a short time.

Further, in the lens fixing step, when the lens holding claw is melted and closely adhered and dissolved, the lens holding pressed through at least three projections for holding the lens diameter. The contact inner diameter portion of the nail portion always comes into contact with the lens outer portion. As a result, the amount of backlash between the lens and the lens frame becomes zero, and the axes of the lens and the lens frame can be easily matched. Furthermore, this eliminates the need for the press-fitting of the lens and the lens frame, which has been conventionally performed, and can eliminate the problem of deformation of the lens frame due to the press-fitting. Further, it is not necessary to provide dimensional accuracy more than necessary for processing the lens or the lens frame, which has been performed for stabilizing the press-fitting process.

As described above, it is possible to fix the lens to the lens frame with higher precision than recently required, and it is possible to easily improve the performance of the lens unit. Next, FIG. 5A is a cutaway view of a main part according to the third embodiment, and FIG. 5B is a cutaway view of a main part showing a state after fixing. FIG. 6 is a sectional view taken along line XX of FIG.

First, in FIG. 5A, reference numeral 1 denotes a lens frame, 1a denotes a peripheral wall portion in the lens frame, 1b denotes a lens positioning step formed in the peripheral portion of the lens frame, and 1c denotes the inside of the frame. Lens holding claws 1d formed in a peripheral shape at the peripheral wall end are cutouts provided at least at three places in the circumferential direction of the lens holding claw 1c, 2 is a lens, and 3 is a lens holding claw. A lens melting mold for melting and molding the part 1c,
Reference numeral 3a denotes an inner peripheral surface serving as a molding surface, and 3b denotes cutouts provided at at least three places in the circumferential direction of the inner peripheral surface 3a.

Reference numeral 4 denotes a cooling air pipe for cooling the lens mounting die after the molding of the lens frame, 5 denotes a large number of cooling air escape holes formed in the lens mounting die 3, and 6 denotes a lens mounting die. Thermocouple attached to measure mold temperature.

FIG. 5B shows a state in which the lens 2 is housed in the lens frame 1 and the lens holding claw 1c is melt-molded, that is, a state in which the lens is fixed to the lens frame. FIG. 6 shows a state in which the lens positioning means is brought into contact with the lens from outside through three cutouts of the lens holding claw 1c as viewed from the lens upper surface side. Reference numeral 13 denotes a lens positioning frame, and 14 denotes a lens positioning frame drive unit. Three sets of these are provided corresponding to the three cutout portions, and an inscribed circle connecting the tips of the three lens positioning frames 13 is formed. Next, in the overall configuration of the lens fixing device shown in FIG. 7, reference numeral 11 denotes a lower mount, on which a lens frame support 12 is mounted. The lens frame support 12 has an inner diameter wall 12a substantially equal to the outermost diameter of the lens frame 1, so that the lens frame 1 can be positioned without play. The lens positioning frame drive unit 14 having the lens positioning frame 13 is mounted on the lens support base 12.
Reference numeral 15 denotes an upper gantry, and 16 denotes a ring-shaped heat source unit mounted on the upper gantry 15, in which a heater is housed and connected to an external power supply via a terminal (not shown) or the like, and is energized.

The lower surface 16a of the heat source unit 16 is finished smoothly, and is arranged so as to be able to come into close contact with the above-mentioned lens melting mold upper surface 3c which has been finished smoothly. In addition, all outer surfaces of the heat source unit 16 other than the lower surface 16a are covered with a heat insulating structure 16b. Reference numeral 17 denotes an air tube connected to the cooling air pipe 4 and connected to a cooling air control device (not shown). Reference numeral 18 denotes a temperature controller for monitoring the output from the thermocouple 6, and the output from the thermocouple 6 is connected to the cooling air control device so that the shutoff of the cooling air can be controlled based on the monitored temperature. Reference numeral 19 denotes a vertical movement shaft, the lower end of which is vertically attached to the upper surface of the lens melting mold 3 by a screw 20 to 3c, and the upper end of which is attached to an unillustrated vertical movement driving device (air cylinder). The upper and lower moving bearings 21 are movably engaged with each other. Reference numeral 22 denotes a long groove formed in the vertical movement bearing 21, and reference numeral 23 denotes a pin set on the vertical movement shaft 19, which allows the lens melting mold 3 to move vertically.
The rotation direction movement is not allowed. The lens frame support 12, the vertical moving bearing 22, the vertical moving shaft 19, and the lens melting mold 3 are so arranged that their central axes coincide with each other.
It is assembled and adjusted on the lower mount 11 or the upper mount 15.

Next, the operation of the lens fixing operation according to the present proposal will be described. In the lens fixing operation, first, the lens frame 1 is inserted into the lens frame support base 12 so as to fit the lens frame 1. Next, the lens positioning piece 13 is operated to position the lens 2 separately from the lens frame 1 (the above-described state of FIG. 6).

On the other hand, before the lens fixing operation, the lens melting mold 3 is held such that the upper surface 3c is in close contact with the lower surface 16a of the heat source unit 16, and the lens pressing claw 1c of the lens frame 1 is melt molded. Warm enough. The above state is illustrated in FIG.

Next, the vertical driving device (not shown) is activated to separate and lower the heated lens melting mold 3 from the heat source unit 16, and the inner peripheral surface 3 a of the lens melting mold 3 is used to hold the lens frame 1 with a vignette. It comes into contact with the claw portion 1c. After reaching the lower end, the lens melting mold 3 is held for a time sufficient to melt-mold the lens pressing claw 1c of the lens frame 1. Thereafter, a cooling air control device (not shown) is activated, and the cooling air is introduced into the lens melting mold 3 through the air tube 17 and the cooling air pipe 4. The introduced cooling air is released to the atmosphere through a cooling air escape hole opened in the lens melting mold 3, whereby the lens melting mold 3 is rapidly cooled.

The temperature of the lens melting mold 3 is monitored by the thermocouple 6 and the temperature controller 18, and when the temperature reaches a certain fixed temperature, the temperature controller outputs a signal of the end of cooling to the cooling air control device, and the air cooling is started. Can be stopped.

This air cooling step is performed in the lens melting mold 3.
After the lens holding claw 1c is melt-molded by the above, the lens melting mold 3 is satisfactorily released from the lens holding claw 1c.
That is, it is necessary to maintain the shape and dimensions and the surface condition of the formed lens pressing claw 1c portion in good condition.
After the cooling step is completed, the lens melting mold 3 is raised by a vertical driving device (not shown), and the upper surface 3c is stopped again at a position where the upper surface 3c is in close contact with the lower surface 16a of the heat source unit 16. As a result, heating of the lens melting mold 3 is started in preparation for the next lens fixing operation.

On the other hand, on the lens frame support 12, the lens positioning piece 13 is operated to release the positioning of the lens 2, and the lens frame 1 with the fixed lens is taken out from the lens frame support 12. Then, a series of lens fixing operations is completed.

Next, a fourth embodiment will be described with reference to FIG. In FIG. 8, the same reference numerals are given to the components already described, and the description is omitted. In FIG. 8A, the lens fusion mold 3 and the lens frame 1 are illustrated, and FIG.
2 shows a state in which the lens is fixed while positioning the lens.

In FIG. 8, the lens melting mold 3 has a third
Notch 3b in the embodiment is not provided,
As shown, it has a uniform inner peripheral surface 3a all around. In addition, the lens holding claw 1c, which is formed to be bent at the inner peripheral wall end of the lens frame 1, has at least three through holes 1 in the circumferential direction.
d is drilled. Reference numeral 13 denotes a lens positioning pin whose outer shape is a through hole 1 formed in the lens holding claw.
smaller than the inner diameter of d. Reference numeral 14 denotes a lens positioning pin drive unit. Three sets of these are provided corresponding to the three through-holes 1d, and the inscribed circle connecting the tips of the three sets of lens positioning pins 13 is adjusted to match the outer shape of the lens 2. .

The above configuration is different only in that the lens positioning pin 13 is operated instead of the lens positioning piece 13, and the other configuration is the same.

FIG. 9A is a fragmentary sectional view of a fifth embodiment.
FIG. 9B is an enlarged view. In FIG. 9, the same reference numerals are given to the components already described, and the description is omitted. FIG. 9 shows a state in which the lens is fixed while the lens is positioned.

In FIG. 9, the notched portion 3b is not provided in the lens melting mold 3, and has a uniform inner peripheral surface 3a all around. Further, on the outer periphery near the lens holding claw 1c formed in a bent shape at the inner peripheral wall end of the lens frame 1, a bottomed counterbore recess 1k having a thin wall is formed at least at three places. ing.

A push-out pin 13 has an outer shape smaller than the inner diameter of the depression 1k formed in the lens holding claw. Reference numeral 14 denotes an extrusion bin drive unit. Three sets of these are prepared corresponding to the three recesses 1k, and the three sets of push pins are adjusted so as to generate the same push force.

In the above arrangement, three sets of push-out pins 13 are operated in place of the lens positioning piece 13, and the concave portion 1 having three thin portions of the lens holding claw 1c is left.
k is deformed by the same force, and the lens is fixed in such a manner that the three locations are brought into contact with the outer diameter of the lens 2.

In the manner described above, it is possible to correct the backlash between the lens and the lens frame, which was impossible only by the conventional lens fixing step of pressing the lens surface, that is, the axis of the lens and the lens frame. It becomes possible to fix the lens whose core has been matched.

As a result, the lens can be easily fixed so that the axes of the lens and the lens frame coincide with each other with high precision. In addition, the lens and lens frame press-fitting step, which has been conventionally performed, becomes unnecessary, and the deformation problem of the lens frame due to press-fitting can be eliminated, and the lens has been performed to stabilize the press-fitting step. It is no longer necessary to give dimensional accuracy more than necessary to the processing of the lens frame.

Further, by adding a lens positioning means from outside without largely changing the conventional form, it is easy to move the lens in the direction of its axis and to position the lens at the same time in the lens fixing step. Can be provided, and more precise lens fixing can be realized.

Further, it is not necessary to form a cut-out portion near the tip of the lens holding claw portion. Even when the claw portion formed for fixing the lens becomes an external appearance portion, it does not impair the aesthetic appearance of the claw portion. The lens can be fixed with high accuracy.

Furthermore, the notch and the through hole are not required in the lens holding claw portion, and the use of the bottomed hole makes it possible to realize a more accurate lens fixing without fear of light leakage in the lens unit. It became so.

Further, the lens diameter pressing portion of the lens fusion die facing the lens outer surface is formed to have at least three projections from a part of the lens surface depression portion on the inner peripheral surface of the lens fusion die. I made it. As a result, the lens fusion mold can be realized without significantly changing the conventional shape. Other than this lens fusion mold, the conventional lens frame support mechanism and the lens fusion mold match the lens frame and the axis of the lens. A more accurate lens fixing can be realized by utilizing the lens fixing device as it is, such as a mechanism for moving the lens along the moving axis and a heating source device for heating the lens melting mold.

The shape required for realizing the functions of the lens holding and the lens centering is set to the lens melting mold 1.
Since the lens is concentrated in three places, even if the shape of the target lens changes, it can be handled by changing only this lens fusion mold in the lens fixing device, and it is inexpensive, in a short time, and can be transferred to other lenses. This makes it possible to apply a highly accurate lens fixing method.

In at least three projections for holding down the lens diameter facing the lens outer surface, at the time when the lens holding claw is melted and tightly formed in the lens fixing process, three points are formed. The diameter of the inscribed circle of the portion where the projection-shaped portion of the lens abuts against the lens holding claw is the outer diameter of the lens and the thickness of the lens holding claw in a shape of being bent around the inner peripheral wall end of the frame. By making it smaller than the sum of two times, at the time of close contact molding, at least 3
The contact inner diameter portion of the lens pressing claw pressed through the lens-diameter pressing protrusions always contacts the outer shape of the lens.

That is, the backlash between the lens and the lens frame becomes zero, and the axes of the lens and the lens frame can be easily matched. As a result, the press-fitting work between the lens and the lens frame, which has been conventionally performed, becomes unnecessary, and the problem of deformation of the lens frame due to the press-fitting can be eliminated. Also,
It is no longer necessary to provide unnecessary dimensional accuracy to the processing of the lens or the lens frame, which has been performed to stabilize the press-fitting step.

Further, after the lens is inserted into the lens frame made of thermoplastic resin, a lens positioning step of positioning the lens by means other than the lens frame structure portion, and a lens fixing step of fixing the lens to the lens frame. By performing the two steps simultaneously and fixing the lens to the thermoplastic resin body, the correction of the play between the lens and the lens frame, which was impossible only with the conventional lens fixing step of pressing the lens surface, that is, Thus, the lens can be fixed with the axes of the lens and the lens frame aligned.

Further, the step of press-fitting the lens and the lens frame, which has been conventionally performed, becomes unnecessary, and the problem of deformation of the lens frame due to the press-fitting can be eliminated. Further, it is no longer necessary to provide dimensional accuracy more than necessary for processing the lens and the lens frame, which has been performed for stabilizing the press-fitting step.

Further, each of a lens pressing claw portion formed in a curved shape on the inner peripheral wall portion of the lens frame body and a lens melting mold having a molding surface for melting and closely forming the lens pressing claw portion. At least three positions in the circumferential direction are cut out, and the lens positioning means is brought into contact with the lens from the outside through the cut-out portion, and the lens melting mold is moved along the moving axis line coincident with the axis of the lens frame and the lens. By fixing the lens to the lens frame by moving the lens, the means for moving and positioning the lens in the direction of its axis at the same time in the lens fixing step can be easily provided.

Further, this method can cope with a case where the surface of the lens is thin, and can be applied to lenses of any shape.

Further, holes are formed in at least three positions in the circumferential direction of the lens holding claw portion formed in a bent shape at the end of the inner peripheral wall of the lens frame, and lens positioning means is brought into contact with the lens from outside through the holes. Then, the lens fusion mold is moved along the movement axis line that coincides with the axis of the lens frame and the lens, and the lens is fixed to the lens frame. Since there is no chipped portion and a continuous circumference is maintained, even when the claw portion formed for fixing the lens becomes an appearance portion, the appearance is not impaired.

Then, at least three recesses (bottomed holes) leaving thin portions are provided on the outer periphery near the lens holding claw portion formed in a bent shape at the end of the inner peripheral wall of the lens frame, and these recesses are formed. By fixing the lens to the lens frame by applying pressure to the lens positioning means from the outside and moving the lens fusion mold along the movement axis that coincides with the lens frame and the core line of the lens. Thus, there is no fear of light leakage in the lens unit.

[0079]

As described above, according to the present invention,
When fixing a lens to a lens frame that requires high accuracy, there is no deviation between the axes of the lens and the lens frame, and the required accuracy such as lens coaxiality can be satisfied, and the lens or lens It is possible to provide a method of fixing a lens to a lens frame, a device for fixing a lens to a frame, and a lens with a frame that do not require high precision in the processing dimensions of the frame.

[0080]

[Brief description of the drawings]

FIG. 1A is a fragmentary sectional view showing a state before fixing a lens and a state after fixing the lens of FIG. 1B, respectively.

FIG. 2A is a bottom view of a lens fusion mold, FIG.
(C) is a detailed view of the protrusion.

FIG. 3 is an overall configuration diagram of a lens fixing device.

FIG. 4 is a state diagram before fixing a lens.

5A is a fragmentary sectional view showing a state before fixing the lens, and FIG. 5B is a fragmentary view showing a state after fixing the lens.

FIG. 6 is a plan view of a fixed mold side.

FIG. 7 is an overall configuration diagram of a lens fixing device.

FIG. 8A is a fragmentary sectional view showing a state before fixing the lens, and FIG. 8B is a fragmentary view showing a state after fixing the lens.

FIG. 9A is a fragmentary sectional view showing a state before fixing the lens, and FIG. 9B is a fragmentary view showing a state after fixing the lens.

FIG. 10 is a fragmentary sectional view showing a state before fixing a lens in a conventional example.

[Explanation of symbols]

 Reference Signs List 1 lens frame 1b stepped portion 1c claw portion 1d through hole 1k concave portion 2 lens 3 lens fusion type (movable type) 3a inner peripheral surface (heating surface) 3b projection-shaped portion 12 lens frame support base (fixed type) 16 heat source Unit 19 Vertical movement axis

Claims (16)

[Claims] A step for positioning a lens is provided on an inner peripheral wall of a lens frame made of a heat-fusible material, a lens is accommodated on the step, and an encircling shape continuously formed from the step. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claws, the device base is fixed to the device base and the lens frame is immobilized. A fixed die, a heating means fixed to the base of the device, and a heating surface for receiving heat for melting the claw portion by contacting and separating from the heating means, and the lens What is claimed is: 1. A lens fixing device for a frame, comprising: a frame and a movable die that is moved along an axis of the lens, wherein the lens retains a lens surface edge of the lens and the claw portion of the lens. For heat melting to move in the axial direction The shape of the three even without the lens fixing device to the frame, characterized in that formed at substantially equal intervals on the heating surface. 2. The lens fixing device according to claim 1, wherein the shape portion is formed by a protrusion having a protrusion shape. 3. The projecting portion, when the claw portion is thermally fused, has a diameter of an inscribed circle connecting a portion abutting on the claw portion, which is two times the outer shape of the lens and the thickness of the claw portion. The lens fixing device according to claim 2, wherein the extension is performed so as to be set to be smaller than the sum of the times. 4. A stepped portion for positioning a lens is provided on an inner peripheral wall of a lens frame made of a heat-fusible material, the lens is accommodated on the stepped portion, and an encircling shape continuously formed from the stepped portion. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claws, the device base is fixed to the device base and the lens frame is immobilized. A fixed die, a heating means fixed to the base of the device, and a heating surface for receiving heat for melting the claw portion by contacting and separating from the heating means, and the lens A lens fixing device for a frame, comprising: a frame and a movable mold that is moved along the axis of the lens, wherein the fixed mold holds an outer peripheral edge of the lens,
A lens fixing device to a frame, comprising a lens holding means for moving the claw portion in the axial direction of the lens. 5. A state in which the lens holding means sneaks into escape portions formed at equal intervals in the lens frame,
The device for fixing a lens to a frame according to claim 4, wherein the device is held in a retracted state. 6. The lens holding device according to claim 4, wherein the lens holding means is kept in a state of infiltrating into through holes formed at equal intervals in an outer peripheral surface of the lens frame and in a state of being retracted. For fixing the lens to the frame. 7. The lens holding means is maintained in a state of infiltrating into a bottomed hole formed at equal intervals on an outer peripheral surface of the lens frame body and in a state of being retracted. A lens fixing device for a frame body according to item 1. 8. A stepped portion for positioning a lens is provided on an inner peripheral wall of a lens frame made of a heat-fusible material, a lens is accommodated on the stepped portion, and an encircling shape continuously formed from the stepped portion. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claw, the lens frame is held in an immovable state by a fixed die fixed to the device base. ,
A movable surface that receives heat for thermally melting the claw portion by coming into contact with and separating from heat generating means fixed to the device base, so as to be along the axis of the lens frame and the lens. A lens fixing method for fixing the lens to the lens frame by moving the claw portion in the axial direction of the lens. A method for fixing a lens to a frame, characterized in that at least three shape portions formed at intervals hold a lens surface edge portion of the lens so that the lens is melted by heat and taken out after curing. 9. The method according to claim 8, wherein the shape portion is formed from a protrusion having a protrusion shape. 10. The projection according to claim 1, wherein, when the claw is thermally melted, an inscribed circle diameter connecting a portion abutting on the claw is two times the outer shape of the lens and the thickness of the claw. The method for fixing a lens to a frame according to claim 9, wherein the extension is performed so as to be set to be smaller than the sum of the magnification. 11. A stepped portion for positioning a lens is provided on an inner peripheral wall of a lens frame made of a heat-fusible material, a lens is housed on the stepped portion, and an encircling shape continuously formed from the stepped portion. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claw, the lens frame is held in an immovable state by a fixed mold fixed to the device base. A movable mold having a heating surface for receiving heat for thermally melting the claw portion by coming into contact with and separating from a heat generating means fixed to the device base; A lens fixing unit for fixing the frame to a frame that is melted by being moved along the axis, wherein the lens holding unit disposed on the fixed mold presses and holds the outer peripheral edge of the lens, and the claw Part by moving it in the axial direction of the lens. Lens fixing method of the frame, characterized by. 12. The frame according to claim 11, wherein the lens holding means is maintained in a state of sneaking into a relief portion formed at equal intervals in the lens frame and a state of being retracted. How to fix the lens to 13. The lens holding device according to claim 11, wherein the lens holding unit is maintained in a state of infiltrating into through holes formed at equal intervals in an outer peripheral surface of the lens frame body and in a state of being retracted. How to fix the lens to the frame. 14. The lens holder according to claim 11, wherein said lens holding means is kept in a state of being sunk into a bottomed hole formed at an equal interval on an outer peripheral surface of said lens frame, and is kept in a retracted state. 3. The method for fixing a lens to a frame according to 1. 15. A stepped portion for positioning a lens is provided on an inner peripheral wall of a lens frame made of a heat-fusible material, a lens is housed on the stepped portion, and an encircling shape continuously formed from the stepped portion. By fusing the claw portion thermally, in order to restrain the edge of the lens and fix it to the lens frame, the lens frame is held immovably in a fixed mold fixed to the device base,
A movable surface that receives heat for thermally melting the claw portion by coming into contact with and separating from heat generating means fixed to the device base, so as to be along the axis of the lens frame and the lens. A lens with a frame that moves and fixes the lens to the lens frame, wherein the claw portions are formed at substantially equal intervals on the heating surface in order to melt the heat so as to move in the axial direction of the lens. A lens with a frame, characterized in that the lens surface edge of the lens is pressed and held by at least three formed portions to be heated and melted and taken out after curing. 16. A stepped portion for positioning a lens is provided on an inner peripheral wall of a lens frame made of a heat-fusible material, a lens is accommodated on the stepped portion, and an encircling shape continuously formed from the stepped portion. In order to restrain the edge of the lens and fix it to the lens frame by thermally fusing the claw, the lens frame is held in an immovable state by a fixed mold fixed to the device base. A movable mold having a heating surface for receiving heat for thermally melting the claw portion by coming into contact with and separating from a heat generating means fixed to the device base; A lens with a frame that melts by moving along the lens, wherein the lens holding means disposed on the fixed mold presses and holds the outer peripheral edge of the lens, and Heat-melt by moving in the axial direction of the lens. Frame with lenses, characterized in.