JPS62235913A - Lens holding device - Google Patents

Abstract

PURPOSE:To provent a lens from generating optical distortion and to easily execute the centering of the lens by forming a gap capable of absorbing the displacement of the lens due to temperature change at a room temperature between the diameter direction of the lens and a mirror frame and fixing the outer peripheral part of the lens with the inner periphery of the mirror frame through elastic adhesive. CONSTITUTION:A lens supporting part 14 for supporting the lens 11 is formed on the mirror frame 12 and the size of the inner periphery 12 of the mirror frame 12 in the diameter direction is set up so as to be stuck on the outer periphery of the lens 11 supported at the maximum temperature to be used for a lens holding device 10. Namely, the lens holding device 10 is heated at the maximum temperature to be used, e.g. 60 deg.C, the centering of the lens 11 is executed under the state that the outer periphery of the lens 11 is stuck on the inner periphery 12a of the mirror frame 12, and under the centered state, the outer peripheral part 16 of the lens 11 is tuck and fixed to the mirror frame 12 through adhesive 13. Thereby, it is unnecessary to use a centering operation tool and the difference of thermal expansion between the mirror frame 12 and the lens 11 can be absorbed by the elastic adhesive 13.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lens holding device, and particularly to a lens holding device that fixes and holds a lens to a lens frame via an adhesive without using a centering jig. Regarding equipment.

[Prior Art 1] Conventionally, as a structure for fixing and holding a lens to a lens frame via an adhesive, there is a technique disclosed in, for example, Japanese Unexamined Patent Publication No. 60-250315. As shown in FIG. 4, this technique involves supporting the lens l on the lens support part 3 provided on the lens frame 2, and then interposing the lens l between the outer circumferential surface of the lens l and the inner circumferential surface of the lens frame 2. The adhesive is fixed using a thick layer of adhesive 4. Reference numeral 5 denotes a centering jig fitted to the outer peripheral surface of the lens frame l, which performs centering operation of the lens l by the bell chuck action of the centering operation part 6 that engages with the first surface of the lens. The settings are configured so that it can be used. In addition, the fourth
In the figure, the right side of the optical axis intersection shows a cross section of the adhesive 4 before curing, and the left side shows the cross section of the adhesive 4 after curing. After the adhesive 4 has hardened, the centering jig 5 is removed from the lens frame 2.

[Problems to be Solved by the Invention] In the above prior art, even if the lens l expands in the radial direction (direction perpendicular to the optical axis) due to environmental changes (temperature changes), the adhesive 4 deforms. Expansion of the lens 1 can be absorbed.

However, since the adhesive 4 is hardened and fixed on the inner circumferential surface of the lens frame 2, its elastic deformation amount is constant. Therefore, when the lens 1 expands beyond the elastic deformation of the adhesive 4, The result is that the expansion of the lens l cannot be absorbed by the deformation of the adhesive 4 alone. In this case, the expansion of the lens 1 causes the lens frame 2 to
There was a problem in that the reaction force from the inner circumferential surface of the lens frame 2 caused optical distortion in the lens 1, resulting in a significantly low optical characteristic. This problem is particularly noticeable in plastic lenses, which have a large amount of expansion and contraction; I''L, and are susceptible to optical distortion.

Furthermore, since four layers of adhesive are formed between the outer circumferential surface of the lens l and the inner circumferential surface of the lens frame 2, a centering jig 5 is used to fix the lens 1 and the lens frame 2. , it was necessary to center the lens l.

The present invention was made in view of the problems of the prior art described in L, and even if the lens expands or contracts greatly in the radial direction due to temperature changes, optical distortion does not occur in the lens. Another object of the present invention is to provide a lens holding device that allows centering of a lens without using a centering jig.

[Pth stage to solve the problem] Unreleased II provides a gap in the radial direction of the lens and between the lens frame that can absorb changes in the lens due to temperature changes at room temperature (during use), and also Under temperature conditions, the outer circumferential surface of the lens and the inner circumferential surface of the lens frame are held in close contact with each other, and the outer circumferential portion of the lens and the inner circumferential surface of the lens frame are fixed with an elastic adhesive.

[Function] In the configuration L, the lens is centered when the lens and the lens frame are brought into contact with each other, and changes in the lens due to temperature changes at room temperature 7.1 are absorbed by the gap and the elastic adhesive. It is something that will be done.

[Example] Hereinafter, an example of unoccurred IJI will be described in detail with reference to the drawings.

(First Embodiment) FIGS. 1a to 1d show a first embodiment of a lens holding device according to the present invention. As shown in FIG. , a lens frame 12 for holding a lens 11, and an adhesive 13 for fixing and holding the lens 11 to the lens frame 12.

The lens frame 12 is formed with a lens support part 14 for supporting the lens 11 when the lens 11 is dropped into the lens frame 12. This support part 24 allows the positioning of the lens 11 in the optical axis direction. It is meant to be done. Furthermore, the diameter direction of the inner circumferential surface 12a of the lens frame 12 of this support portion 14 is as follows:
It is configured to be in close contact with the outer circumferential surface of the supported lens 11 at the maximum expected operating temperature of the lens holding device IO, and to center the lens 11.

FIG. 1a shows a state fi in which the lens 11 is dropped into the lens frame 12 at room temperature (for example, 20° C.), and there is a gap between the inner circumferential surface 12a of the lens frame 12 and the outer circumferential surface of the lens 11. It has A. Figure 1 shows the lens holding device 1 in this state.
It shows a state in which the inner circumferential surface 12a and the outer circumferential surface of the lens ti are in close contact with each other,
The lens is centered. FIG. 1C shows a state in which the two lenses 11 are adhesively fixed to the outer circumference 16 of the lens 11 and the lens frame 12 using the elastic adhesive 13. Thereafter, the state in which the lens holding bag 2110 is returned to room temperature is shown in FIG. The lens holding device 10 is configured in this state.

Such a lens holding bag 710 can center the lens 11 when adhering the lens 11 and the lens frame 12, so a centering jig is not required. Furthermore, until the expected maximum temperature for use is reached, the expansion of the lens 11 due to temperature changes causes the lens frame 12 to
The difference in thermal expansion between the lens frame 12 and the lens frame 12 can be absorbed by the elastic adhesive 13 without being blocked by the inner circumferential surface 12a of the lens frame 1.
Therefore, it is possible to obtain a lens holding device 10 that does not generate a reaction force from the inner peripheral surface 12a of the lens 11 and can prevent distortion of the lens 11.

(Second Embodiment) FIGS. 2A to 2C show a second embodiment of the lens holding device 10 according to the present invention.

In this example, the lens 1 is
1 is aligned and adhesively fixed to the lens frame 12 to constitute a lens holding device.

FIG. 2a shows a state in which the lens 11 is supported by the lens support portion 17 of the lens frame 12 at room temperature (for example, 25° C.). The lens 11 has four parts 18 formed on its outer peripheral surface, and a gap B is formed between the four parts 18 and the outer periphery of the lens support part 17. This gap B is, as shown in Figure 2,
Lens holding bag, Lens 1 in IEX at the lowest temperature expected to be used (e.g. -20°C)
The concave portion 18 of 1 and the lens support portion 17 are in close contact with each other, and the lens 11
The configuration allows for centering. The lens 11 and the mirror frame 12.

It is adhesively fixed by the elastic adhesive 13 under the expected lowest temperature condition. After that, the state where the temperature is returned to normal temperature is shown in FIG. 2C, and the lens 11 and concave i'1l18
The lens frame 1 is attached with the elastic adhesive 13 with the lens 11 centered while a gap is formed between the lens support portion 17 and the lens support portion 17
2 to form a lens holding device 10.

This lens holding bag 211O holds the lens 11 and the lens frame 12.
Since the centering of the lens 11 can be performed when adhering to the lens 11, there is no need for a centering jig.
The difference in thermal contraction between the
can be obtained.

(Third Embodiment) FIG. 3 shows a third embodiment of the lens holding device 20 according to the present invention.

In this embodiment, the lens holding bag 2110 of the first embodiment is
A lens support member 2 is placed between the lens 11 and the elastic adhesive 13.
1 to constitute the lens holding bag 2120.

The lens support member 21 is attached to the lens frame 12 using an elastic adhesive 13.
At the same time, the lens 11 closely supports the outer circumferential surface 16 of the lens 11 without interfering with radial expansion (contraction) of the lens due to temperature changes.

This lens holding bag 2120 has the same functions and effects as those of the first embodiment, and the lens support member 21 allows the lens to be attached to the lens frame 12 with the adhesive 1 in the first embodiment.
When the lens 11 is returned to room temperature after being fixed to the adhesive 13, it is possible to prevent the lens 11 from being distorted due to the tensile force exerted by the adhesive 13.

[Effects of the Invention] As described above, according to the present invention, even if the lens thermally expands or contracts due to temperature change.

Since the amount of change can be absorbed by the gap between the lens and the lens frame and the elastic adhesive, no optical distortion occurs in the lens, and the optical characteristics of the lens can always be maintained in a good state. Further, when centering the lens, no centering jig is required. In addition, the structure of the mirror frame can be simplified.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing the first embodiment of the lens holding device according to the present invention, FIG. 1a is a cross-sectional view of the lens dropped into the lens frame, and FIG. 1C is a sectional view at the time of adhesion, FIG. 1D is a sectional view at room temperature, and FIG. Figure 2a is a sectional view of the lens fixed to the lens frame, and Figure 2a is the predetermined temperature state IE.
Cross-sectional view when the lens and lens frame are bonded together in the photo frame, Figure 2C
3 is a sectional view showing a third embodiment of the lens holding device according to the present invention, and FIG. 4 is an explanatory diagram of the prior art. 10... Lens holding device 11... Lens 12... Lens frame 13... Adhesive 16... Lens outer peripheral part 18... Four parts 21... Lens support members A, B... Gap Patent applicant: Olympus Optical Industry Co., Ltd. Figure 1 (.) (d) Figure 2 (b) (c) Figure 3 Figure 4

Claims (1)

[Claims] In a lens holding device configured to fix and hold a lens on a lens frame via an adhesive, at room temperature (when in use)
A gap is provided between the radial direction of the lens and the lens frame that can absorb the amount of change in the lens due to temperature changes at A lens holding device characterized in that the outer peripheral part of the lens frame and the inner peripheral surface of a lens frame are fixed with an elastic adhesive.