JPS61270713A - Holding tool for lens - Google Patents

Abstract

PURPOSE:To remove the protrusion of an adhesive agent to a lens body by arranging adhesive agent receptacles having function for holding the adhesive agent between the lens body and a lens holding frame to fix the lens. CONSTITUTION:Four adhesive agent receptacles 3 are connected by links 4 so as to be arranged on a circumference to form a ring-like adhesive auxiliary tool 5. The auxiliary tool 5 is dropped in the lens holding frame 1 and then the lens body 2 is dropped into the auxiliary tool 5. Then, the insides of the adhesive agent receptacles 3 are filled with the adhesive agent and the adhesive agent is hardened to fix the lens body 2 in the lens holding frame 1. Thus, the centering of the lens body 2 in the lens holding frame 1 is executed by using the adhesive agent receptacles 3 as guides and the adhesive agent is prevented from being protruded to the effective diameter of the lens body 2 because the adhesive agent is filled to the adhesive agent receptacles 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens holder for adhering and fixing a lens to a holding member.

[Prior Art] Conventionally, methods for fixing optical elements such as lenses to holding members such as lens barrels include mechanical methods such as screw retaining rings or springs, and methods using adhesives. In order to fix and hold the optical element on the holding member, a force exceeding a certain amount is required, which has the disadvantage of causing distortion in the optical element. Although the adhesive method has less influence on the optical properties of β-lens than the mechanical method, it was still not possible to avoid the influence on the optical properties due to differences in shrinkage and thermal expansion during curing of the adhesive.

For this purpose, various devised means have been proposed. In the method described in JP-A-58-195811, a stepped portion is provided on the outer circumferential surface of the lens or the inner circumferential surface of the lens barrel that is a holding member thereof, and adhesive is applied only to this stepped portion and cured. This allows the lens to be held without distortion. Furthermore, in the device described in JP-A-59-135406, the gap between the outer circumferential surface of the lens and the lens barrel that is its holding member is filled with an adhesive whose Young's modulus is smaller than that of the material of the lens when solidified. The adhesive is not applied over the entire circumferential surface of the lens, but is applied to the lens by applying it to only 3 or 4 points on the circumferential surface so as to hold it in a bridge shape. This is an attempt to eliminate the impact as much as possible. Conventional fixing and holding methods using adhesives, including these methods, involve dropping the lens body into the lens fitting part of the lens barrel, and removing the radial clearance created between the lens body and the lens fitting part of the lens barrel. A syringe with a needle attached to the syringe is used, or a thin rod-shaped jig is used to fill the adhesive with adhesive, allow it to harden, and fix the adhesive in its initial position.

[Problems to be Solved by the Invention] As mentioned above, adhesive fixing methods have less effect on optical elements than mechanical methods such as caulking, but when filled with adhesive, ■ Lens Adhesive extrudes into the effective diameter of the main body, causing major problems in appearance and performance. ■Contractile force acts on the outer circumferential direction of the lens due to the solidification of the adhesive, which tends to cause distortion in the lens. (2) Many cleaning steps are required to wipe off the protruding adhesive, and defects in the lens body and lens barrel that occur during this process cannot be ignored, and this is especially true in the case of plastic lenses with low solvent resistance. ■The one shown in Figure 6 of JP-A-58-195811 has an adhesive inlet on the lens barrel side, but since it is located perpendicular to the lens assembly direction, There are restrictions on the members that can be placed outside. ■
In the case of JP-A-59-135406, it is necessary to provide a gap between the outer periphery of the lens and the inner periphery of the lens holding frame, which requires centering the lens, which inevitably increases the number of assembly steps. .

[Means and effects for solving the problem] In the present invention, an auxiliary tool in which an adhesive receiver is connected in a ring shape with a link is inserted between the inner wall of the lens holding frame and the lens body, and the adhesive receiver is glued inside. The lens body is fixed within the lens holding frame by filling with the agent. In addition, by forming the adhesive receiver, the link, or only the adhesive receiver from a material with a value lower than the Young's modulus of the material forming the lens body, the adhesive can be prevented from seeping out into the lens body, and the lens shape To center a lens and fix it within a frame without causing any change.

[Example] An example of the lens holder of the present invention will be described based on FIGS. 1(A) and 1(B). FIG. 1(B) shows a link-shaped adhesion aid 5 in which four adhesive receivers 3 are connected by links 4 so as to be arranged on the circumference.

Drop this into the lens holding frame 1, then the lens body 2
into this link-shaped adhesion aid 5. Then, the lens body 2 can be fixed within the lens holding frame 1 by filling the adhesive receiver 3 with adhesive and curing the adhesive.

The adhesive receiver 3 acts as a guide to realize centering of the lens body 2 within the lens holding frame 1, and since the adhesive 6 is filled into the adhesive receiver 3, the effective diameter of the lens body 2 is adjusted. It will no longer stick out.

Furthermore, by forming only the adhesive receiver 3 and the link 4 or the adhesive receiver 3 from a material having a Young's modulus lower than that of the material forming the lens body 2, such as silicone rubber, it is possible to It is possible to produce an effect that does not cause a change in shape (occurrence of distortion) even if the change occurs.

Next, a second embodiment of the lens holder of the present invention will be described based on FIGS. 2(A) and 2(B). The main configuration is the first one above.
This embodiment is the same as the '1st embodiment shown in the figure, but the difference is that an inner wall 7 is provided inside the adhesive receiver 3. Figure 2 (
B) is a sectional view taken along the line A-A in FIG. The position of is determined. The outer wall 8 is higher than the lens barrel protrusion 9 due to the deflection of the lens body 2.

Further, the height of the inner wall 7 is lower than that of the outer wall 8. Therefore, when the adhesive 6 is filled between the inner wall 7 of the adhesive receiver 3 and the lens body 2, it overflows the inner wall 7, so even if excessive adhesive 6 is filled, the lens body 2 will not be contaminated. There's nothing wrong with that. Incidentally, the thickness of the bottom of the adhesive receiver 3 in both the first and second embodiments is the same as the thickness required to retract the lens.

Next, Figure 3 (A), (B), (C), (
A third embodiment of the lens holder of the present invention will be described based on D). The main configuration is the above 1. It is the same as the second embodiment, but the difference is that the link 4 is removed and the adhesive receiver 3 is placed separately between the lens body 2 and the lens holding frame 1, and its positioning is Therefore, a frame recess 10 is provided in the lens holding frame 1 to match the shape of the adhesive receiver 3. The shape of the adhesive receiver 3 is shown in Figure 3 (B
) has a U-shaped cross section and has an inner wall 7 therein, as shown in Figure 3(C), has a U-shaped cross section, and as shown in Figure 3(D) An arcuate, box-shaped one can be considered. In this example as well, the thickness of the bottom of the adhesive receiver 3 is the same as the above-mentioned thickness. Like the second embodiment, it has a thickness corresponding to the lens coating.

In addition, 1. In the second and third embodiments, the case where four adhesive receivers 3 are arranged is shown, but it goes without saying that three or more adhesive receivers 3 may be provided.

[Effects of the Invention] In order to fix the lens body 2 within the lens holding frame 1, the lens holder of the present invention has an adhesive receiver 3 interposed between the lens body 2 and the lens holding frame 1 to hold the adhesive. As a result, the adhesive does not protrude into the lens body, and centering is possible.Furthermore, since the adhesive receiver 3 is made of a material with a lower Young's modulus than that of the material of the lens body 2, the lens does not leak during adhesion or due to temperature changes. This makes it possible to suppress the changes in shape caused by the lens, making it possible to provide a high-performance lens system.

[Brief explanation of drawings]

FIGS. 1(A) and 1(B) are views showing an embodiment of the lens holder of the present invention, and FIG. 1(A) is a plane view showing a state in which the lens is fitted into the lens holding frame. Figure, Figure 1 (B)
2(A) is a perspective view of the adhesion aid, FIGS. 2(^) and 2(B) show a second embodiment of the lens holder of the present invention, and FIG. 2(A) is an enlarged view of the main part. A perspective view, Figure 2 (B) is a sectional view of the main part, Figure 3 (
A), (B), (C), and (D) show a third embodiment of the lens holder 1 holder of the present invention, and FIG. 3(A) shows how the lens is attached to the holding frame. Plan view showing the fitted state, Fig. 3 (B), (C), (D
) are enlarged perspective views showing modified examples of the adhesive receiver. 1... Lens holding frame. 2... Lens body 3... Adhesive receiver ◇ T I Ward (A)

Claims (3)

[Claims] (1) A lens holder for fixing a lens in a lens holding frame, characterized by fixing the lens by interposing an adhesive receiver with a function of holding adhesive between the lens body and the lens holding frame. lens holder. (2) The lens holder according to claim 1, wherein the adhesive receiver has an inner wall lower in height than the outer wall thereof. (3) The lens holder according to claim 1, wherein the Young's modulus of the material of the adhesive receiver is lower than the Young's modulus of the material forming the lens.