JPS62255909A - Lens holding device - Google Patents

Abstract

PURPOSE:To shorten the production process and to uniformize the quality of products by providing a lens body with a holding part which has deformation absorbing grooves and can be deformed in radial and thrust directions. CONSTITUTION:An adhesive 4 by which a lens body 1 is fixed to a lens frame 2 by adhesion is inserted between the upper end part of the lens frame 2 and the outside peripheral surface of a thrust adjusting part 8. The deformation in the thrust direction of the body 1 is absorbed by a radial adjusting part 7 connected to the body 1. The adjusting part 8 connected to the body 1 is allowed to function as a projecting part which positions the body 1 in the thrust direction. The deformation of the lens is absorbed by deformation absorbing grooves 9 and 9' formed between the body 1 and the adjusting part 7 and between the body 1 and the adjusting part 8. Thus, the production process is shortened and the quality of products is uniformized.

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.

[Prior Art] Conventionally, as a structure for fixing and holding a lens to a lens frame via an adhesive, a structure as seen in, for example, Japanese Patent Application Laid-Open No. 60-250315 has been adopted (see Fig. 4). ), that is, the lens body 1 is attached to the lens support part 3 stretched around the inner periphery of the lens frame 2, and the adhesive 4 interposed between the outer periphery of the lens body and the inner periphery of the lens frame 2 is The centering operation jig 5 having the centering operation part 6 is pressed to center the lens, and the lens body l and the lens frame 2 are joined together, and then the centering operation jig 5 is removed. It is something that In FIG. 4, the right side of the optical axis intersection is a cross-sectional view showing the state of the adhesive 4 before hardening, and the left side of the optical axis intersection is a cross-sectional view showing the state of the adhesive 4 after hardening. The operating jig has been removed.

[Problems to be Solved by the Invention] However, in the configuration of the conventional lens holding device of this type, in order to interpose the adhesive 4 between the lens body 1 and the lens frame 2, a centering operation tool is required. The use of a tool 5 becomes necessary, which necessitates an increase in the manufacturing process and may result in uneven product quality.In addition, the lens body 1 expands and contracts due to temperature changes after the adhesive 4 hardens. The present invention eliminates these drawbacks and makes it possible to actually attach the lens to the lens frame without using a centering jig. It is an object of the present invention to provide a lens holding device which can prevent the generation of internal stress caused by expansion and contraction of the lens due to temperature changes, and which does not deteriorate its optical characteristics.

[Means for Solving the Problems] The lens holding device of the present invention provides a holding part that is deformable in the radial and thrust directions and has deformation absorbing grooves in the lens body, and also attaches the holding part to the lens frame with adhesive. It is constructed by fixing.

[Function] The radial adjustment section 7 connected to the lens body 1 absorbs deformation of the lens body 1 in the radial direction to "f fle," and the thrust adjustment section 8 connected to the lens body 1 similarly
Thereby, the function of the projecting portion for positioning the lens body 1 in the thrust direction is performed, and between the lens body 1 and the radial adjustment portion 7, and between the lens body 1 and the thrust direction 3
The lens deformation is absorbed by the deformation absorbing groove 9 formed between the lens and the straightening part 8.

[Example] Hereinafter, an example of the lens holding device of the present invention will be described in detail based on the drawings.

(First Embodiment) FIGS. 1a and 1b show a first embodiment of a lens holding device according to the present invention. 1 is a lens body, and 2 is a lens frame that holds the lens body 1. On the outer periphery of the lens body l, a radial adjustment part 7 that is a deformable part in the radial direction and a thrust adjustment part 8 that is a protrusion part that determines the position in the thrust direction are each arranged in series at least three force points, and furthermore, the lens body l and the radial Lens deformation absorbing grooves 9 and 9' are formed between the adjustment section 7 and between the radial adjustment section 7 and the thrust adjustment section 8, respectively. In FIG. 1a, the adhesive 4 for adhesively fixing the lens body 1 to the lens frame 2 is interposed between the upper end of the lens frame 2 and the outer peripheral surface of the thrust adjustment section 8. As shown in FIG.

Further, in FIG. 1b, the adhesive 4 is filled into an adhesive reservoir 10 provided in an inner circumferential recess of the lens frame 2. As shown in FIG.

In this way, the radial adjustment section 7 connected to the lens body 1
It is possible to absorb the deformation of the lens body l in the radial direction.
1, and the thrust similarly connected to the lens body 1:
JJ "! The i part 8 acts as a protruding part for positioning the lens body 1 in the thrust direction, and the lens body 1 is located between the lens body l and the radial adjustment part 7 and the lens body l.
The lens deformation is absorbed by the deformation absorbing groove 9.9' formed between the lens and the thrust adjusting portion 8. The adhesive 4 may be of any type, but may be rubber-based or acrylic resin-based.

If you use an elastic adhesive such as a phenol resin, urea resin, or polyester resin, even if the lens expands or absorbs deformation to some extent depending on the usage environment, the adhesive will elastically deform, making the deformation more effective. can be absorbed.

(Second Embodiment) Figures 2a and 2b show a second embodiment of the lens holding device according to the present invention.The feature of the lens holding device according to this embodiment is that the thrust adjustment section 8 is This is a point that protrudes in the radial direction.

As a result, even if the range of movement is somewhat large when positioning the lens in the thrust direction, it is absorbed. Since the other configurations are the same as those of the first embodiment, the same members are given the same reference numerals and the explanation thereof will be omitted.

(Third Embodiment) Figures 3a and 3b show a third embodiment of the lens holding device of the present invention. A feature of the lens holding device according to this embodiment is that lens deformation absorbing arms 11 extending obliquely outward are provided on the outer periphery of the lens body 1 at at least three force points.

The adhesive 4 is filled into the 7-shaped groove formed between the lens deformation absorbing arm 11 and the lens frame 2 (Figure 3a), thereby absorbing the deformation caused by expansion and contraction of the lens body 1 due to temperature changes. can be done. Incidentally, the joint portion of the lens frame 2 with the lens body 1 can also be formed into a tapered lens frame taper portion 12 as shown in FIG. 3b. Thereby, the thickness of the adhesive 4 can be increased, and the absorption effect against deformation of the lens body 1 can be further improved.

[9. Bright Effect] According to the lens holding device of the present invention, a holding portion having a deformation absorbing groove and a deformable turning portion in the radial and thrust directions is provided in the lens body, and this is fixed to the lens frame with an adhesive. Since the lens is held, a jig for centering the lens is not used, so the manufacturing process can be shortened, the quality of the product can be made uniform, and the manufacturing cost can be reduced. Even if the lens expands or contracts due to temperature changes, these changes can be absorbed, and there is an effect that a lens holding device with good performance without deterioration of optical characteristics can be provided.

[Brief explanation of drawings]

Figures 1a and 1b are cross-sectional views showing the first embodiment of the lens holding device of the present invention, Figures 2a and 2b are cross-sectional views showing the second embodiment of the lens holding device of the present invention, and Figure 3a 3B and 3B are cross-sectional views showing a third embodiment of the lens holding device of the present invention, and FIG. 4 is a cross-sectional view of a conventional lens holding device. l...Lens body 2...Mirror frame 7...Radial style! 1 part 8... Thrust adjustment part 9... Deformation absorption groove 11... Lens deformation absorption arm

Claims (1)

[Claims] 1. A lens holding device, characterized in that a lens main body is provided with a holding part that is deformable in the radial and thrust directions and has a deformation absorbing groove, and the holding part is fixed to a lens frame with an adhesive.