JP2002098874A - Fixing structure of optical element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure of an optical element such that an optical element can be easily fixed to a frame, the fixing structure is inexpensive and can be adopted regardless of the form (thickness) of optical elements, and that the optical elements or frames can be reused. SOLUTION: A lens 10 as an optical element is housed in a frame 20. A pressure-sensitive adhesive or adhesive is applied on the rear face of a seal 30. The seal 30 is stuck across the optical element 10 and the frame 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device such as a lens, an optical low-pass filter, and a prism.
The present invention relates to an optical element fixing structure for fixing an optical element to a frame.

[0002]

2. Description of the Related Art There are various types of conventional fixing structures for fixing an optical element to a frame in an optical apparatus as described below. In the following description, a lens is taken as an example of the optical element. Figure 5
In FIG. 7, parts having substantially the same function are denoted by the same reference numerals.

[0005] Screw ring: As shown in FIG. 5, a screw is cut in the inner peripheral portion of a frame 2 in which a lens 1 is housed, and a screw ring 3 having a male and female opposite thread is cut into the frame 2. A structure in which a part of the screw ring 3 is pressed against the lens 1 and fixed by screwing.

[0006] Lens Holder: As shown in FIG. 6, a lens holder 4 is fixed to a frame 2 in which a lens 1 is housed, and a part of the lens holder 4 is pressed against the lens 1 to be fixed.
Means for fixing the lens holder 4 to the frame 2 include fitting, screwing with a screw, and the like. Further, there is also a structure in which the lens holder 4 itself is formed as a C-ring and fitted into a groove provided in a lens barrel (not shown) in advance and, at the same time, is fixed to the lens 1.

Caulking: As shown in FIG. 7 (B), the height of the edge of the frame 2 for housing the lens 1 is made slightly higher than the lens 1 in the state of being accommodated in the frame 2, A structure in which the edge portion is heat-sealed by a jig 5 called a horn in a state of being housed in the frame 2, and the swaged portion is fixed to the lens 1 as shown in FIG. In addition to heat staking, there is also plastic deformation due to pressure. Adhesion: Although not shown, a structure in which the lens 1 and the frame 2 are directly fixed with an adhesive.

The above four types of fixing structures are properly used depending on the positioning accuracy, fixing strength, tolerance to thermal expansion, workability, and the like of the optical element required for the optical equipment.

[0007]

As an example, when assembling a video camera having a photographic lens (lens 1), it is found that dust or scratches are found on the surface of the lens 1 after the assembly is completed, and the inspection is rejected. May be. Further, it may be found that the eccentricity of the lens 1 itself is large, or the lens 1 is fixed in a state where it is not properly accommodated in the frame 2, and the inspection may be rejected. In such a case, it is economical and preferable to reuse the components such as the lens 1 and the frame 2 after correcting the problem.

[0008] However, the above-mentioned conventional fixing structure is not suitable for reusing parts and has other problems. That is, in the bonding of caulking and
Since it is difficult to reuse the frame 2 and it is highly likely that the lens 1 will be damaged during disassembly, it is not suitable for repair. In addition, when the end of the lens 1 is thin, the lens 1 cannot be chipped or a chamfer cannot be provided when the end of the lens 1 is thin. It is not suitable for an optical element having a thin end because of a problem such as sticking. A jig is necessary for fixing the lens 1 to the frame 2, and the fixing operation is not easy.

In the screw ring 3 and the lens holder 4, it is necessary to cut a screw in the frame 2 or to provide a hole, a projection or a recess in advance, and the screw ring 3 and the lens holder 4 are not provided.
In addition, there is a problem that an arm for hooking on a screw, a hole, a projection, or a dent is required, so that the cost of a part itself and the cost of a mold are increased. Further, when the lens 1 is made of plastic, the linear expansion coefficient between the lens 1 and the frame 2 is greatly different. There are points.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is easy to fix an optical element to a frame, inexpensive, and can be employed regardless of the shape (thickness) of the optical element. It is an object of the present invention to provide a fixing structure of an optical element that can be reused and that can reuse an optical element and a frame.

[0011]

According to the present invention, there is provided an optical element fixing structure for fixing an optical element housed in a frame (20) to the frame to solve the above-mentioned problems of the prior art. (33) An optical element fixing structure characterized in that a seal (30) coated with an adhesive is attached so as to extend over the frame and the optical element.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical element fixing structure according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a first embodiment of the optical element fixing structure of the present invention, FIG. 2 is a cross-sectional view showing the first embodiment of the optical element fixing structure of the present invention, and FIGS. FIG. 4 is a plan view showing a state in which the inner seal 30 is viewed from the back surface, and FIG. 4 is a sectional view showing a second embodiment of the optical element fixing structure of the present invention.

<First Embodiment> In FIG. 1, (A) shows a state where each part is disassembled, and (B) shows a state where each part is assembled. In the first embodiment and a second embodiment described later, a lens is used as an example of the optical element. The fixing structure of the present invention is not limited to fixing a lens, but can be employed for fixing various optical elements such as an optical low-pass filter and a prism.

As shown in FIGS. 1A and 1B, a frame 20 for housing the lens 10 has a substantially circular shape when viewed from above, and a circular opening 21 is formed at the center thereof. ing. A concave portion 22 for accommodating the lens 10 is formed at an inner peripheral end of the frame 20. The outer diameter of the recess 22 is
The size is such that the lens 10 just fits. Further, as shown in FIG. 2, the depth of the concave portion 22 is
Is approximately the same height as the peripheral edge of
The recess 22 is slightly shallow so that it slightly projects from zero. A pair of protrusions 23 are provided on the upper surface of the frame 20 by integral molding.

The lens 10 is fixed to the frame 20 by a seal 30 while the lens 10 is housed in the concave portion 22 of the frame 20. The seal 30 has a substantially circular shape when viewed from above, and has a circular opening 31 formed in the center thereof. The seal 30 has a pair of holes 32 into which the pair of protrusions 23 are inserted. Seal 30
Although not shown here, an adhesive 33 is applied to the back surface (the lens 10 side). The seal 30 is a flexible plastic sheet such as a PET sheet or a polyester sheet having a thickness of about 0.1 mm.
The sheet is black and opaque and has a fine grain formed on the surface for matting.

The hole 32 of the seal 30 is inserted into the projection 23,
When the seal 30 is attached to the lens 10 and the frame 20, as shown in FIG. 2, the seal 30 (adhesive 33) adheres to the lens 10 and the frame 20 so as to straddle the lens 10 and the frame 20. As described above, the outer peripheral end of the lens 10 is substantially the same as or slightly higher than the end of the frame 20 on the side of the concave portion 22 (the part in contact with the lens 10). The lens 10 is well adhered across the frame 20 and the lens 10 and is fixed to the frame 20. The present inventor has confirmed that if the peripheral end of the lens 10 is lower than the frame 20, it cannot be fixed well. The lens 10
And the part of the frame 20 to which the seal 30 is attached has a smooth surface.

The adhesive 33 may be applied to the entire back surface of the seal 30. However, as shown in FIG. 3, the adhesive 33 is not applied to the inner peripheral end of the seal 30 (the periphery of the opening 31). (That is, the adhesive 33 is preferably applied while leaving the inner peripheral end portion). Reference numeral 34 denotes an area where the adhesive 33 is not applied.
As described above, when the non-application region 34 where the adhesive 33 is not applied is provided on the inner peripheral portion of the seal 30 and the application range of the adhesive 33 is set to be slightly larger than the opening 31, the peripheral portion of the opening 31 No dust adheres to the seal 30
It is possible to reduce defects due to the attachment of dust to itself. It should be noted that the non-applied area 34 is of course a range that does not extend to the boundary between the lens 10 and the frame 20.

<Second Embodiment> A second embodiment shown in FIG.
The positioning means of the seal 30 with respect to the frame 20 is different. 4, parts having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals. Although the shape of the frame 20 shown in FIG. 4 differs from that of the frame 20 shown in FIGS. 1 and 2, the same reference numerals are used for convenience. In the first embodiment, the projections 23 and the holes 32
4, the seal 30 is positioned on the frame 20. In the second embodiment, as shown in FIG. 4, a concave portion 24 for accommodating the seal 30 is provided, and the seal 30 is positioned by the outer shape of the seal 30. .

As described above, in the fixing structure of the present invention using the seal 30 coated with the adhesive 33, the fixing operation of the lens 10 to the frame 20 is extremely easy. Moreover, the seal 30 is extremely inexpensive. If it is necessary to remove the lens 10 from the frame 20, the seal 30 can be peeled off.
It can be reused. Since it is the adhesive 33,
The peeled seal 30 can be used again.
Further, the fixing structure of the present invention can be employed even if the end of the lens 10 is thin, and is thus versatile.

Further, if the diameter of the opening 31 of the seal 30 is adjusted to the effective diameter of the lens 10, the seal 30 can also function as a fixed stop that determines the effective diameter of the lens 10.

<Other Embodiments> In the first and second embodiments, the seal 30 coated with the adhesive 33 is used.
Alternatively, an adhesive may be applied. Even with the seal 30 to which the adhesive is applied, the seal 30 can be peeled off, and parts can be disassembled and reused. However, the peeled seal 30 cannot be reused. Since the seal 30 is inexpensive, it does not matter much. The seal 30 to which the adhesive is applied can fix the lens 10 to the frame 20 more firmly than the seal 30 to which the adhesive 33 is applied.

In the optical device employing the fixing structure of the present invention, even if dust or scratches are found on the optical element and the inspection is rejected, the optical element or parts such as the frame can be reused. . Even if it is necessary to dispose of the optical element, the optical element, which is mainly made of glass, and the frame, which is made of metal or plastic, can be easily separated. .

[0023]

As described in detail above, in the fixing structure of the optical element of the present invention, a sticker coated with an adhesive or an adhesive is attached so as to straddle the frame and the optical element. The work of fixing the optical element to the frame is easy, inexpensive, can be adopted irrespective of the shape (thickness) of the optical element, and is practically excellent in that the optical element and the frame can be reused. It works.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a first embodiment of the present invention.

FIG. 3 is a plan view showing a state in which the seal 30 in FIGS. 1 and 2 is viewed from the back surface.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing a first conventional example.

FIG. 6 is a sectional view showing a second conventional example.

FIG. 7 is a sectional view showing a third conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lens (optical element) 20 Frame 21, 31 Opening 22, 24 Depression 23 Projection 30 Seal 32 Hole 33 Adhesive

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Akira Yokoi 3-12-12 Moriyacho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture F-term in JVC, Ltd. (Reference) 2H043 AE09 AE21 2H044 AA02 AA09 AG01

Claims (5)

[Claims] 1. An optical element fixing structure for fixing an optical element housed in a frame to the frame, wherein a sticker coated with an adhesive or an adhesive is attached so as to extend over the frame and the optical element. An optical element fixing structure characterized by being attached. 2. The optical element fixing structure according to claim 1, wherein positioning means for positioning the seal on the frame is provided only on the frame or on the frame and the seal. 3. The optical element according to claim 1, wherein an outer peripheral end of the optical element housed in the frame has a height substantially equal to or slightly higher than a portion of the frame in contact with the outer peripheral end. The optical element fixing structure according to claim 1. 4. The optical element fixing structure according to claim 1, wherein the seal has an opening, and a non-application region of the adhesive or the adhesive is provided around the opening. . 5. The fixing structure for an optical element according to claim 1, wherein said seal has an opening, and said opening acts as a stop for light passing through said optical element.