JPS62239115A - Lens holding device - Google Patents

Abstract

PURPOSE:To absorb the change of dimensions in the optical axis direction and the diametral direction of a lens due to the variation of temperature by providing a gap part between the lens and a lens frame and interposing the first and second elastic rings between the lens frame and the lens and sealing and solidifying an adhesive having elasticity between both elastic rings. CONSTITUTION:The first elastic ring 30 is set to a contacting face 12 of a lens 10 by a contacting face 31, and the second elastic ring 33 is set to a contacting face 13 of the lens 10 by a contacting face 34. An adhesive 40 is applied to rings 30 and 33 and they are dropped to the inside of a lens frame 20, and a contacting face 14 of the lens 10 is brought into contact with a contacting face 24 of the lens frame 20, and contacting faces 32 and 35 of rings 30 and 33 set to the lens 10 are brought into contact with contacting faces 22 and 23 of the lens frame 20, and in this state, a retaining ring 26 is engaged with a screw part 27 of the lens frame 20 to press and fix the lens 10 into the lens frame 20. The retaining ring 26 is detached from the lens frame 20 after the adhesive 40 is solidified, thereby holding the lens 10 in the lens frame 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens holding device that can respond to changes in temperature or humidity.

[Prior Art] A lens holding device for holding a lens without causing distortion due to changes in temperature or humidity is disclosed in Japanese Patent Application Laid-open No. 57-1.
A lens fixing device described in Japanese Patent No. 41607 can be mentioned.

As shown in FIG. 4, such a lens fixing device is installed on the front surface of the lens between the lens frame 1 and the lens 3 after the lens 3 is fitted into the lens fitting part 2 of the lens frame l. A soft filler 5 is injected into the gap 4 and solidified, and a presser ring 7 is screwed onto a threaded portion 6 provided inside the lens frame 1.
The lens 3 is fixed to the lens frame 1 via the soft filler 5.

[Problems to be Solved by the Invention] However, in the lens fixing device, when the lens 3 expands and contracts due to changes in temperature and humidity, the dimensional change in the optical axis direction of the lens 3 is caused between the presser ring 7 and the lens 3. A soft filler 5 that has been injected and solidified is interposed in the gap 4 provided in the front surface of the lens 3, and the expansion and contraction action of the soft filler 5 absorbs it, thereby preventing the occurrence of distortion in the same direction. Regarding dimensional changes in the radial direction, the lens 3 is fixed by the lens fitting part 2 for centering and holding the lens 3 with respect to the lens frame l, and there is no structure that can absorb this, and distortion in the same direction is not provided. Unable to prevent occurrence.

Therefore, it has been impossible to maintain the lens without completely deteriorating its optical performance against changes in temperature and humidity.

Therefore, the present invention was devised in view of the drawbacks of the lens fixing device, and is a device that absorbs dimensional changes in both the optical axis direction and the radial direction of the lens due to changes in temperature or humidity. It is an object of the present invention to provide a lens holding device that can hold a lens without deteriorating its optical performance while preventing the occurrence of distortion.

[Means for Solving the Problems] The lens holding device of the present invention provides a gap between the lens and the lens frame, and interposes a first elastic ring between the lens frame and the lens in the optical axis direction, A second elastic ring is interposed between the lens frame and the lens in the radial direction, and an elastic adhesive is sealed and solidified between the first elastic ring and the second elastic ring. be.

[Function] The lens holding device of the present invention provides a gap between the lens and the lens frame, a first elastic ring and a second elastic ring interposed between the lens frame and the lens, and a gap between the elastic rings. Due to the elasticity of each of the sealed and solidified adhesives, dimensional changes in the optical axis and radial directions due to changes in temperature and humidity of the lens within the lens frame can be absorbed.

[Example] Hereinafter, an example of the lens holding device of the present invention will be described with reference to the drawings.

Fig. 1 is a partially omitted sectional view showing an embodiment of the lens holding device of the present invention, and Fig. 2 is an enlarged partially omitted elastic ring interposed between the lens frame and the lens in the optical axis direction. The cross-sectional view and FIG. 3 are enlarged cross-sectional views in which a part of the elastic ring interposed between the lens frame and the lens in the radial direction is omitted.

In the figure, 10 is a lens, 20 is a lens frame that holds the lens 10, an annular step 11 is formed on the outer peripheral surface of the lens 10, and an elastic ring is interposed in the annular step 11. A surface 12 is provided for axial abutment, and a surface 13 is provided for radial abutment.

Further, a surface 14 is formed on the outer circumferential side surface of the lens 1O for abutment with the lens frame 20.

An annular step 21 corresponding to the step 11 on the outer peripheral surface of the lens 10 is formed inside the lens frame 20, and an elastic ring is interposed in the annular step 21 in the optical axis direction. The abutment is provided by a surface 22, and the radial abutment is provided by a surface 23.

In addition, a surface 24 is provided protrudingly on the end side of the surface 23 for abutment with the lens lO, and the lens frame 20 is abutted in the radial direction.
A gap portion 25 is provided on the inside of the lens frame 20 to create a required gap between the inner diameter of the lens frame 20 and the outer diameter of the lens 10, and a threaded portion 27 of a retaining ring 26 is screwed onto the inner peripheral surface of the lens frame 20. It is.

Further, 30.33 is a first lens which is compressed and interposed between the lens frame 20 and the lens 10, and the contact in the optical axis direction is between the surfaces 12 and 22, and the contact in the radial direction is between the surfaces 13 and 23. and a second elastic ring, both elastic rings 30.33
A flat abutting surface 31.34 with the surface 12.13 is provided to which the lens 10 is abutted, and an abutting surface 32.35 having annular grooves 32a and 35a is provided with the surface 22.23 to which the lens frame 20 is abutted. In addition, the distance between the abutting surface 31 and the abutting surface 32 of the first elastic ring 30 is 9.2, and the distance between the abutting surface 22 and the abutting surface 24 of the lens frame 20 is 9.2. In relation to the distance between the surface 12 and the surface 14,
fL3>C1+ - statement), and the thickness between the contact surface 34 and the contact surface 35 of the other second elastic ring 33 is equal to the inner diameter d4 of the elastic ring 33. and the outer diameter d3, the mounting of the lens 10 is the outer diameter d of the surface 13.
1 and the lens frame 20 are configured such that the relational expressions d4<d, d3>d2 are established between the inner diameter d2 of the surface 23, and are integrally formed of an elastic member. There is.

Reference numeral 40 denotes an elastic adhesive sealed and solidified between the first and second elastic rings 30 and 33 compressed and interposed between the lens frame 20 and the lens 10.

As the adhesive 40, an elastic adhesive member such as silicone resin or silicone rubber is used.

Next, the lens frame 2 in the lens holding device consisting of the above mechanism
A method of mounting the lens 10 on the lens 10 will be described below.

First, the lens 10 is attached by attaching the first elastic ring 30 to the surface 12 with its abutting surface 31 abutting, and the lens 10 is attached by attaching the second elastic ring 33 to the surface 13.
are mounted with their contact surfaces 34 abutting against each other.

After that, adhesive 40 is applied to the first and second elastic rings 31 and 33 attached to the lens lO, and then the lens frame 20 is
Insert the lens lO into the lens frame 2 and attach the surface 14 to the lens frame 2.
0 is brought into contact with the surface z4, and the contact surfaces 32° 35 of the first and second elastic rings 30 and 33 attached to the lens lO are brought into contact with the surface 22°2.
The lens lO is pressed and fixed within the lens frame 20 by screwing the presser ring 26 onto the threaded portion 27 of the lens frame 20 while in contact with the lens 10.

At this time, the excess adhesive 40 flows out to the outside of the first and second elastic rings 30.33 between the contact surface 12.13 of the lens 10 and the contact surface 22.23 of the lens frame 20. An annular groove 32a of each elastic ring 30.33.

As a result of the adhesive 40 flowing into the grooves 35a and being tightly sealed within the grooves 32a and 35a, it is possible to prevent the adhesive 40 from flowing out to the outside of both rings 30 and 33.

When the adhesive 40 has solidified, the holding ring 26 can be removed from the inside of the lens frame 20 to remove the lens 1.
0 is held in the lens frame 20.

Furthermore, as described above, the first and second elastic rings 3
0.33, each of which has a configuration satisfying the above relational expressions, the lens 10 is attached to the surface 12.13 and the lens frame 20 is attached to each other under a compressed state between the surfaces 22.23. be equipped.

Therefore, when the dimensions of the lens 10 change in the lens frame 20 due to changes in temperature or humidity, the changes in dimensions in the optical axis direction are absorbed by the first elastic ring 30, and the changes in dimensions in the radial direction are absorbed by the first elastic ring 30. 2 elastic ring 3
3, and the lens 10 can be held within the lens frame 20 while preventing deterioration of optical performance due to distortion caused by changes in temperature and humidity of the lens 10.

Further, since the elastic rings 33 are evenly compressed and interposed in the gaps in the radial direction of the lens 10, eccentricity of the lens 10 can be prevented.

Although the first and second elastic rings 30.33 are illustrated with annular grooves 32a and 35a provided on one contact surface 32.35, it is of course possible to implement the first and second elastic rings 30.33 without providing the annular grooves. Equitable.

[Effects of the Invention] According to the lens holding device of the present invention, dimensional changes in the optical axis and radial directions of the lens due to changes in temperature and humidity can be absorbed, and the lens can be held without deterioration of optical performance.

[Brief explanation of drawings]

Fig. 1 is a partially omitted sectional view showing an embodiment of the lens holding device of the present invention, and Fig. 2 is an enlarged sectional view omitting a part of the elastic ring interposed between the lens frame and the lens in the optical axis direction. Figure, 3rd
The figure is an enlarged sectional view with a part omitted of an elastic ring interposed between the lens frame and the lens in the radial direction, and FIG. 4 is a sectional view with a part omitted showing a conventional lens holding device. 10... Lens 11... Annular stepped portion 12, 13, 14... Abutting is done on surface 20... Lens frame 21... Annular step 22, 23, 24... Abutting is Surface 25... Gap 26... Presser ring 27... Threaded portion 30.33... Elastic ring 31.32, 34.35... Contact surface 32a, 35a... Annular groove 40...・Adhesive・10. (Contact) 1 Deleted Figure 2 Figure 3 Figure 4 Procedural amendment (voluntary) July 18, 1985 1. Indication of the case 1988 Patent Application No. 83464 2. Title of the invention 3. Relationship with the case of the person making the amendment Patent application Person address 2-43-2 Hatagaya, Shibuya-ku, Tokyo Name
(037) Olympus Optical Industry Co., Ltd. Representative Toshibe Shimoyama 4, Agent 5 Date of amendment order 7 Contents of amendment (1) Figure 1 in the middle of the drawing is amended as shown in the attached sheet. 8. List of attached documents

Claims (1)

[Claims] (1) A gap is provided between the lens and the lens frame, a first elastic ring is interposed between the lens frame and the lens in the optical axis direction, and a second elastic ring is provided between the lens frame and the lens in the radial direction. 1. A lens holding device characterized in that an elastic ring is interposed therebetween, and an elastic adhesive is sealed and solidified between the first elastic ring and the second elastic ring.