JPH10104489A - Lens device and lens assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To press a lens not only along the optical axis, but also radially and guarantee high position precision of the lens in a lens device which holds the lens by deforming and crimping part of a lens holding member. SOLUTION: An optical-axis directional pressure part 16a and an external- diameter pressure part 18a are provided by turns adjacently to the lens reception part 14 of the lens holding member 10. The lens 1 is positioned on the lens reception part 14, a 2nd heating jig 30 is made to abut against the lens reception member 14, and the external-diameter pressure part 18a is heated, pressed, and deformed to the lens 1 in a radial direction 38; and a 1st heating jig 20 is made to abut and the optical-axis directional pressure part 16a is heated, pressed, and deformed to press the lens 1 in the optical axis direction 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lens device and a lens assembling method.

[0002]

2. Description of the Related Art Conventionally, in a lens device in which a lens group consisting of one or more lenses (hereinafter, simply referred to as a lens) is held by a cylindrical lens holding member, a method of holding the lens by the lens holding member. As a known method, a method of bonding a lens to a lens holding member using an adhesive, and a method of deforming a part of the lens holding member by heat or pressure and caulking to hold the lens on the lens holding member are known. .

In a conventional method of holding a lens on a lens holding member with an adhesive, for example, as shown in a sectional view of FIG. 1, a lens 1x is placed in a lens receiving portion 2y at a predetermined position in a cylinder of a cylindrical lens holding member 2x. By inserting and injecting an adhesive between the lens 1x and the lens holding member 2x, a strong adhesive force is given between the lens 1x and the lens holding member 2x, and the lens 1x is held by the lens holding member 2x.

However, according to the method using the adhesive, when the lens 1x is thin, the outer peripheral surface of the lens to which the adhesive is applied becomes small. . Furthermore, in the method using an adhesive, the productivity is poor because it is necessary to control the amount of the adhesive to be injected when manufacturing the lens device.

On the other hand, in a conventional method of holding a lens on a lens holding member by swaging, as shown in a sectional view of FIG. 2, for example, a lens receiving portion 2y of a lens holding member 2x.
The lens 1x is inserted into the lens 1x by deforming the tip of the deformed portion 2Bx of the lens holding member 2x provided adjacent to the lens receiving portion 2y so as to fall down to the lens 1x side and fitting the lens 1x. Is held by the lens holding member 2x. This method does not require an extra space 3 unlike the method using an adhesive, and is suitable for making the lens device compact. Further, since the management of the deformation of the deformed portion 2Bx of the lens holding member 2x is easier than the management of the injection amount of the adhesive, this method is also excellent in productivity.

However, in the method by caulking, unlike the method using an adhesive, the deformed portion of the lens holding member merely presses the lens in the optical axis direction. In some cases, misalignment may occur in the direction, and it is difficult to guarantee high positional accuracy of the lens. Therefore, the method of holding a lens by deforming a part of the lens holding member satisfies the high positional accuracy required for each lens as the number of lenses decreases due to the recent compactness of the lens device. That is difficult.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a technical problem to be solved by the present invention is to deform a part of a lens holding member to mount a lens. In a lens device and a lens assembling method for holding a lens by tightening, a lens device and a lens assembling method are provided in which a lens is pressed not only in an optical axis direction but also in a radial direction so that high positional accuracy of a lens can be guaranteed. That is.

[0008]

In order to solve the above technical problems, the present invention provides a lens device and a lens assembling method having the following configurations.

In the lens device, a lens is positioned in a seat formed at a predetermined position in a cylinder of a cylindrical lens holding member, and the lens is substantially moved in the optical axis direction by a plurality of first heat deformation portions of the lens holding member. It is pressed and held evenly. The lens holding member further includes a plurality of second heat deforming portions that press the outer peripheral surface of the lens substantially uniformly in the radial direction. Preferably, the first heat deformable portion and the second heat deformable portion of the lens holding member are arranged substantially uniformly in a circumferential direction around the lens.

A lens device for holding a lens as described above can be manufactured by assembling the lens as follows.

The method for assembling a lens includes a first step of positioning the lens in the seat of the lens holding member, and a step of heating and pressing and deforming the first heat deformable portion of the lens holding member. The lens is pressed substantially evenly in the optical axis direction, while the second
A second step of heating and pressing the heat deforming portion to deform the lens so that the lens is pressed substantially uniformly in the radial direction without causing misalignment.

That is, the lens holding member comprises a plurality of first
It has a heat deformation part and a second heat deformation part. In order to hold the lens on the lens holding member, in the first step,
The lens is arranged in the seat of the lens holding member, and the lens is positioned in the optical axis direction and the radial direction. Next, in the second step, the first heat deformable portion and the second heat deformable portion of the lens holding member are heated by an appropriate heat source and deformed by an appropriate method, and the lens is moved in the optical axis direction by the first heat deformable portion. To
The lens holding member is arranged in such a manner that the lens is oriented radially by the second heat deforming portion, that is, at right angles to the optical axis and toward the optical axis so that misalignment does not occur, that is, the lens center coincides with the optical axis. And hold it approximately evenly in the seat.

[0013] In the above configuration, the first of the lens holding members is provided.
If the heat deformation portion and the second heat deformation portion are arranged substantially evenly in the circumferential direction, it becomes easier to press the lens almost uniformly.
Further, since the first and second heat deformable portions of the lens holding member are provided separately, while the optical axis direction press and the radial direction press of the lens are separately changed and adjusted, Can easily find the optimum processing conditions. In the first step, the inner diameter of the inner peripheral surface of the seat is slightly larger than the outer diameter of the outer peripheral surface of the lens so that the lens can be easily arranged in the seat. Even if a radial gap is provided between the lens center and the optical axis, the lens center can be aligned with the optical axis by uniformly pressing the lens in the radial direction by the second heat deformable portion of the lens holding member.

Therefore, by deforming a part of the lens holding member and swaging the lens, the lens can be pressed not only in the optical axis direction but also in the radial direction, and high positional accuracy of the lens can be guaranteed.

Preferably, three of the first and second heat deformable portions of the lens holding member are alternately arranged in the circumferential direction.

In the above configuration, the first of the lens holding members is provided.
The minimum number of the heat deformation portions and the second heat deformation portions can be configured.

That is, in the case where two first heat deformable portions of the lens holding member are provided, the lens may rotate around a line connecting the two first heat deformable portions. In order to hold down the first heat deformation part by 3
It is preferable to provide one or more. When three or more first heat deformation portions are provided, the rotation of the lens about a line connecting any two first heat deformation portions is prevented by the other first heat deformation portions, so that the lens is stabilized. This is because it can be held down in the optical axis direction.

Similarly, when two second thermal deformation portions of the lens holding member are provided, the lens is perpendicular to the line connecting the two second thermal deformation portions in the plane perpendicular to the optical axis. In order to more stably hold the lens in the radial direction, it is preferable to provide three or more second heat deformable portions because the lens may move. When three or more second thermal deformation portions are provided, the movement of the lens in the direction perpendicular to the line connecting any two second thermal deformation portions in the plane perpendicular to the optical axis is prevented by the other second thermal deformation portions. Therefore, the lens can be stably pressed in the radial direction.

Therefore, by providing three first and second thermal deformation portions of the lens holding member, the lens can be stably held with the simplest configuration.

In the second step of thermally deforming the first and second heat deformable portions of the lens holding member in order to press and hold the lens, the second step is performed next to the first heat deformable portion of the lens holding member. The second thermally deformed portion may be thermally deformed, or both the first thermally deformed portion and the second thermally deformed portion may be simultaneously thermally deformed. Further, a processing jig for pressing and deforming may be used separately from the heat source for heating.

Preferably, in the second step,
A heating jig is brought into contact with the second heat deforming portion of the lens holding member, and is pressed and deformed while being heated, so that the lens is pressed substantially uniformly in the radial direction without causing misalignment. After that, a heating jig is brought into contact with the first thermally deformed portion of the lens holding member, pressed and deformed by heating,
The lens is pressed substantially uniformly in the optical axis direction.

According to the above, both the heating and the pressing of the thermally deformed portion of the lens holding member can be performed using the heating jig, so that the caulking operation is simplified. Furthermore, since the first and second heat deforming portions are not heat deformed at the same time, but are heat deformed sequentially in time,
It is possible to further simplify the operation by thermally deforming both of the heat deformable portions using one kind of heating jig. In addition, when pressing in the radial direction of the second heat deformable portion is performed next to pressing in the optical axis direction of the first heat deformable portion of the lens holding means,
If the lens is decentered after the first heat deformation portion, the radial position of the lens is corrected at the time of the second heat deformation portion, and the clearance between the first heat deformation portion and the lens. Therefore, the pressing of the lens in the optical axis direction by the first heat deforming portion may be weak, but the pressing of the first heat deforming portion in the optical axis direction is performed next to the pressing of the second heat deforming portion in the optical axis direction as described above. Is performed, the radial pressing of the lens by the second heat deforming portion is not loosened when the first heat deforming portion is pressed in the optical axis direction.
Therefore, the lens can be pressed and held more easily and with higher precision.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a lens device and a lens assembling method according to an embodiment of the present invention will be described in detail with reference to FIGS.

In this lens apparatus, as shown in the plan view of FIG. 3 and the sectional view of the main part of FIG. 4, the lens 1 is disposed in the lens receiving portion 12 of the lens holding member 10, and the optical axis of the lens holding member 10 is The lens 1 is held at a predetermined position of the lens holding member 10 by pressing the lens 1 with the direction pressing portions 16a, 16b, 16c and the outer diameter pressing portions 18a, 18b, 18c.

As shown in FIG. 4, the lens holding member 10
Has a substantially cylindrical cylindrical wall 12, a lens receiving portion 14 is formed at an end of the cylindrical wall 12, and inner peripheral surfaces 12 a, 14 a, and 14 b of the cylindrical wall 12 have a stepped cross section. I have. When the lens 1 is disposed in the lens receiving portion 14, the lens 1 is positioned in the direction perpendicular to the axis by the inner peripheral surface 14b of the lens receiving portion 14 and in the optical axis direction by the bottom surface 14a of the lens receiving portion 14. It has become.

As shown in FIGS. 3 and 4, around the lens receiving portion 14 at the end of the cylindrical wall 12 of the lens support member 10, optical axis direction pressing portions 16a, 16 protruding in the axial direction.
b, 16c and outer diameter holding portions 18a, 18b, 18c are formed. As shown in FIG. 3, three optical axis direction pressing parts 16a, 16b, 16c and outer diameter pressing parts 18a, 18b, 18c are arranged alternately in the circumferential direction and at symmetrical positions with respect to the optical axis. Have been. The radial thickness of the optical axis direction pressing portions 16a, 16b, 16c is smaller than the radial thickness of the outer diameter pressing portions 18a, 18b, 18c, and the height of the optical axis direction pressing portions 16a, 16b, 16c, that is, the protrusion. The amount is larger than the height of the outer diameter holding portions 18a, 18b, 18c.

As shown in FIG. 4, the outer diameter pressing portions 18a,
Reference numerals 18b and 18c are formed continuously from the inner peripheral surface 14b of the lens receiving portion 14, and come into contact with the outer peripheral surface 1t of the lens 1 to position the lens 1 in a direction perpendicular to the optical axis. . On the other hand, the optical axis direction pressing portions 16a, 16b, 16
c is formed slightly outside the inner peripheral surface 14b of the lens receiving portion 14, and as illustrated in an exaggerated manner, the inner peripheral surfaces of the optical axis direction pressing portions 16a, 16b, 16c and the outer peripheral surface 1t of the lens 1 are formed. A gap 8 is formed between them.

In this lens device, as follows:
The lens 1 is inserted into the lens receiving portion 14 of the lens holding member 10.
Is retained.

First, as shown in FIG. 4A, the lens 1 is inserted into the lens receiving portion 14 of the lens holding member 10,
The lens 1 is positioned with respect to the lens holding member 10 in the optical axis direction and in the direction perpendicular to the optical axis, that is, in the radial direction. That is, the lens 1 is positioned in the axial direction by abutting on the radially extending bottom surface 14 a of the lens receiving portion 14 of the lens holding member 10, and the lens receiving portion 14 of the lens holding member 10, that is, the outer diameter pressing portion 16 a , 16b, 1
6c is positioned in the direction perpendicular to the optical axis by contacting the inner peripheral surface 14b extending in the axial direction.

Next, as shown in FIGS. 3 and 4B,
The heated second heating jig 30 is moved from the periphery of the lens holding member 10 toward the optical axis in a substantially radial direction 38 so as to come into contact with the outer diameter pressing portions 18a, 18b, 18c of the lens holding member 10, and The diameter pressing portions 18a, 18b, 18c are pressed and deformed while being heated. The second heating jig 30 includes a first surface 32 and a second surface 33 along the lens surface 1 s and the outer peripheral surface 1 t of the lens 1, and a third surface 34 extending radially outward from a lower portion of the second surface 33. , A fourth surface 35 extending axially downward from the third surface 34. The ends 18x of the outer diameter pressing portions 18a, 18b, 18c of the lens holding member 10 are connected to the second heating jig 3
The second surface 33 and the third surface 34 are heated and softened, and are pushed inward from the outside in the radial direction, and press the outer peripheral surface 1t of the lens 1 in the radial direction 38. Outer surface 1t of lens 1
And the lens holding member 10 sandwiched between the lens surface 1s and the first surface 32 and the second surface 33 of the second heating jig 30.
The outer diameter holding portions 18a, 18b, 18c of the second heating jig 3
With the pushing in the radial direction 38 of 0, the space between the lens 1 and the second heating jig 30 is pushed out to the inside of the lens. The protruding portions 18y of the outer diameter pressing portions 18a, 18b, 18c that are pushed out between the lens 1 and the second heating jig 30 toward the inside of the lens press the lens 1 in the optical axis direction 20. That is, in the lens 1, the upper part of the lens opposite to the bottom surface 14a of the lens receiving part 14 is pushed in the radial direction 38, and furthermore,
The protruding portion 18y of the lens holding member 10 is also pressed in the optical axis direction 28. Therefore, the lens 1
While being prevented from rising from the lens receiving portion 14 and being displaced in the optical axis direction, the outer diameter pressing portions 18a, 18b, 1
8c allows it to be held down in the radial direction.

Next, as shown in FIG. 4B, the heated first heating jig 20 is moved substantially in the optical axis direction 28 toward the end of the lens holding member 10, and The optical axis direction pressing portions 16a, 16b, and 16c are brought into contact with the optical axis direction pressing portions 16a, 16b, and 16c, and are deformed by being pressed while being heated. The first heating jig 20 has a first surface 22 and a second surface 23 along the lens surface 1 s and the outer peripheral surface 1 t of the lens 1, similarly to the second heating jig 30. Ends 16x of optical axis direction holding portions 16a, 16b, 16c of lens holding member 10
Is heated and softened by the second surface 23 and the third surface 24 of the first heating jig 20, bends radially inward, and presses the lens surface 1 s of the lens 1 in the optical axis direction 28. Lens 1
The optical axis direction pressing portions 16a, 16b, 16c of the lens holding member 10 sandwiched between the outer peripheral surface 1t and the lens surface 1s and the first surface 22 and the second surface 23 of the second heating jig 20 are:
As the first heating jig 20 is pushed in the optical axis direction 28,
The space between the lens 1 and the first heating jig 20 is pushed inward of the lens.

Finally, as shown in FIG. 4C, the first and second heating jigs 20 and 30 are separated from the lens holding member 10 and cooled, and the optical axis pressing portion 1 of the lens holding member 10 is cooled.
6a, 16b, 16c and outer diameter holding portions 18a, 18b, 18c
To cure. After cooling, the optical axis direction pressing portions 16a, 16a of the lens holding member 10 that has fallen on the lens surface 1s of the lens 1
Ends 16x of b and 16c press the lens 1 in the optical axis direction 28. On the other hand, the inner peripheral surface of the end portion 18x of the outer diameter pressing portions 18a, 18b, 18c of the lens holding member 10 pushed inward from the radial outer side, that is, the inner peripheral surface 14b of the lens receiving portion 14 is the outer peripheral surface of the lens 1. 1t is pressed in the radial direction 38.

As described above, the lens 1 is swaged by the lens holding member 10, and movement in the optical axis direction and the radial direction is prevented. Therefore, this lens device can guarantee high positional accuracy of the lens. The end of the lens holding member 10 has a minimum number, namely, three optical axis direction pressing portions 16a, 16b, 16c and an outer diameter pressing portion 1a.
The configuration is the simplest because 8a, 18b and 18c are provided alternately in the circumferential direction. Further, the lens holding member 10
Since the optical axis direction pressing portions 16a, 16b, 16c and the outer diameter pressing portions 18a, 18b, 18c are separately provided, the pressing in the optical axis direction 28 of the lens 1 and the radial direction 38 are performed separately. It is possible to easily find the optimum processing conditions while making changes and adjustments separately.

The present invention is not limited to the above embodiment, but can be implemented in various other modes. For example, the lens receiving portion 14 may be provided not at the end of the lens holding member 10 but at an intermediate position in the axial direction. Further, the optical axis direction pressing portions 16a, 16a of the lens holding member 10 are provided.
Instead of thermally deforming the b, 16c and the outer diameter pressing portions 18a, 18b, 18c using separate heating jigs 20, 30, the same heating jig may be used to thermally deform.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a lens device in which a lens is fixed by a conventional adhesive.

FIG. 2 is a sectional view of a lens device in which a lens is fixed by partially deforming a conventional lens holding member.

FIG. 3 is a plan view of a lens holding member of the lens device according to the embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a lens device according to an embodiment of the present invention. (A) shows before heating, (B) shows during heating, and (C) shows after heating.

[Explanation of symbols]

 Reference Signs List 1 lens 1s lens surface 1t outer peripheral surface 10 lens holding member 12 cylindrical wall 12a, 12b inner peripheral surface 14 lens receiving portion (seat) 14a step surface 16a, 16b, 16c optical axis direction pressing portion (first heat deforming portion) 16x end Part 18a, 18b, 18c Outer diameter holding part (second thermal deformation part) 18s Inner peripheral surface 18x End part 18y Protruding part 20 First heating jig 22 First surface 23 Second surface 28 Optical axis direction 30 Second heating jig Tool 32 1st surface 33 2nd surface 34 3rd surface 35 4th surface 38 Radial direction

Claims (4)

[Claims] A lens is positioned in a seat formed at a predetermined position in a cylinder of a cylindrical lens holding member, and the lens is substantially uniformly distributed in the optical axis direction by a plurality of first heat deformable portions of the lens holding member. In the lens device that is pressed and held, the lens holding member further includes a plurality of second thermal deformation portions that press the outer peripheral surface of the lens substantially uniformly in a radial direction. 2. The lens according to claim 1, wherein the first and second heat deformable portions of the lens holding member are arranged substantially uniformly in a circumferential direction around the lens. Lens device. 3. The lens device according to claim 1, wherein three of the first and second heat deformable portions of the lens holding member are alternately arranged in a circumferential direction. 4. A method of positioning a lens in a seat formed at a predetermined position in a cylinder of a cylindrical lens holding member, heating and pressing and deforming a plurality of first thermally deformed portions of the lens holding member. In a lens assembling method for holding a lens substantially uniformly in an optical axis direction, the lens holding member further has a plurality of second heat deformable portions, and the first heat deformable portion and the second heat deformable portion of the lens hold member are provided. A first step of positioning the lens in the seat of the lens holding member; a first step of positioning the lens in the circumferential direction around the seat of the lens holding member; By heating and deforming the heat deforming portion by pressing it, the lens is pressed substantially uniformly in the optical axis direction, while the second heat deforming portion of the lens holding member is heated and pressed to deform. Above A second step of pressing the lens substantially uniformly in the radial direction without causing misalignment.