JPS6095510A - Holding device for plastic lens - Google Patents

Abstract

PURPOSE:To hold a lens without damaging lens surfaces by arranging a proper number of support arm parts capable of deforming elastically and freely at the outer circumferential part of a lens and incorporating a lens holding part in a lens barrel. CONSTITUTION:When the lens 1 is fixed in the lens barrel 2, the lens 1 is inserted into the lens barrel 2 firstly. In this case, the lens is inserted without allowing support arm parts 5 and the lens holding part 8 to contact each other, and then the lens 1 is rotated in such a direction that chamfered parts 6b and 7b engage chamfered parts 8a and 8b. Then, arm pieces 6 and 7 of the lens 1 are deformed elastically by the lens holding part 8 to increase in interval, and the arm pieces 6 and 7 restore themselves where the lens is rotated until projection parts 6a and 7a for engagement engage recessed parts 10 and 11 for engagement of the lens holding part 8, holding the lens 1 fixedly at the specific position in the lens barrel 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a holding device for plastic lenses.

Prior Art and its Problems As a means for fixing a plastic lens to a lens barrel, fixing means as shown in FIG. 1 is usually employed. That is, the dvll is provided with a fitting surface s3 and an abutting surface section 4 for the outer peripheral surface of the lens 2, and the lens 2 is fitted onto the fitting surface section 3 and the abutting surface section 4. The lens 2 can be held in the lens barrel 1 by screwing in the thrust direction a retaining ring 6 that is screwed onto the female threaded portion 5.

However, the above-mentioned conventional technology has the following various problems. First of all, since the holding ring 6 is required in addition to the lens barrel 1 as a component for holding the lens 2, this results in an increase in the number of parts, an increase in manufacturing man-hours, an increase in assembly man-hours, etc. The cost was high.

Furthermore, since the process of carving the female threaded portion 5 for screwing the presser ring 6 is increased, the cost is extremely high. Second, since the lens 2 is suppressed and fixed via the holding ring 6, damage to the lens surface cannot be prevented.

Thirdly, due to uneven pressing force of the lens 2 by the presser ring 6, the lens 2 may be tightened with a force greater than the required force, or the tightening force may be insufficient. If the lens 2 is tightened more than necessary, distortion will occur in the lens 2 and the lens 20
This causes the optical characteristics of the lens to deteriorate, such as a change in curvature, and if the tightening force of the lens 2 is insufficient, there is a problem in that the threaded portion of the retainer ring 6 becomes loose.

OBJECTS OF THE INVENTION The present invention has been made in view of the problems of the prior art described above, and its purpose is to provide a lens with a simple structure that can be securely and easily held on a lens barrel, and The object of the present invention is to provide a plastic lens holding device that can hold the lens surface without damaging it.

Structure of the Invention The present invention provides a lens in which an appropriate number of elastically deformable support arms equipped with convex portions or concave portions for engagement with a lens barrel are disposed on the outer periphery of a lens body, and a lens for engagement of the support arms. The above objects of the present invention are achieved by providing a plastic lens holding device consisting of a convex part or a concave part and a lens barrel in which a lens holding part including four parts or a convex part that can be freely moved is provided. That is. Embodiments of the present invention will be described in detail below using the drawings from FIG. 2 onwards.

Embodiments FIGS. 2 to 1 show the first embodiment of the holding device according to the present invention.
21, 3, and 6 show the structure of the lens 1, and FIGS. 4, 5, and 7 show the structure in which the pA is applied to the lens barrel 2.

As shown in the figure, an appropriate number of pairs of support arms 5 are disposed on the outer peripheral surface 4 of the lens body 3 of the lens 1. This support kis5 is the outer peripheral surface 4 of the lens body 3.
It is desirable to distribute them evenly. Each pair of support arms 5 consists of two arm pieces 6 as shown in FIGS. 2, 3, and 6.
, 7, and each arm piece 6.7 is arranged at an appropriate interval A shifted in the thrust direction of the lens 3, and is also arranged at an appropriate interval B shifted between the lenses as shown in FIG. It is set up. At the distal ends of each of the arm pieces 6 and 7, on the same plane, a retaining convex portion 5a is provided for fixing and holding the lens 1 to the lens barrel 2 in cooperation with a lens holding portion 8 of the lens barrel 2, which will be described later.
, 7a are integrally provided, and each engagement protrusion 6a,
A chamfered portion 6b is provided on one side of 7a to facilitate engagement with a lens holding portion 8 of a lens barrel 2, which will be described later.

7b is formed.

On the inner surface 9 of the lens housing part of the lens barrel 2 in which the lens 1 is stored and held, there is a lens holding part 8 for fixing and holding the lens 1 to the lens barrel 2 in cooperation with the support arm part 5 of the lens 1. It is permanently installed. The number of lens holders s8 is fixed to be the same as the number of supporting arms 5 provided on the outer circumference of the lens 1, and the number of lens holders s8 is the same as that of the supporting arms 5 provided on the outer periphery of the lens 1. The mounting is arranged at a position corresponding to the position.

The thickness of the lens holding part 8 is the same as that of each arm piece 6 shown in FIG.
7 in the thrust direction, and is set to be at least larger than the gap C between the engaging protrusions 6a and 7a of each arm piece 6 and 7. Both sides (upper and lower surfaces) of each lens holding part 8 in the thrust direction (synonymous with the thrust direction of the lens barrel 2)
, an engaging convex portion 6a of each support arm portion 5 of the lens body 3;
Engagement recesses 10 and 11 that can freely engage (fit) with 7a are provided.

On one side of each lens holding portion 8, there are chamfered portions ga and 5b that function similarly to the chamfered portions 6b and 7b of the lens 10.
is formed. That is, by rotating the lens 1 in the circumferential direction after inserting the lens 1 into the lens barrel 2, the lens holding part 8 is held between the arm pieces 6 and 7, and the lens holding part 8 is held between the arm pieces 6 and 7. The lens 1 is configured to be fixedly held at a predetermined position of the lens barrel 2 when the engaging convex portions 6a, 7a of 6 and 7 and the engaging concave portions io, ii of the lens holder s8 are engaged with each other. ing. It goes without saying that the configurations of the retaining protrusions 6a, 7a and the engaging recesses 10, 11 may be reversed. In addition, in the above embodiment, as shown in FIGS. 6 and 7, the number of supporting arm portions 5 and lens holding portions 8 is set to three, which are equally distributed around the circumference.
The present invention is not limited to this, and any number may be used as long as the lens cover 1 can be stably fixed and held on the lens barrel 2.

In the above configuration, the operation of the present invention will be explained. When fixing the lens 1 to the lens barrel 2, the lens 1 is first inserted into the lens barrel 2.

In this case, the support arm part 5 and the lens holding part 8 are inserted so that they do not come into contact with each other. Then, attach the lens 1 to the chamfered portion 5I.
), 7b is the chamfered portion 5a.

8b. Then, each of the arm pieces 6 and 7 of the lens 1 is elastically deformed by the lens holding part 8 so as to increase the distance between them, and the engaging convex parts 5a of the lens 1,
When the engaging concave portions 7a and the engaging concave portions io and ii of the lens holding portion 8 are rotated to the position where they engage with each other, the multiple actions of the respective arm pieces 6°7 cause the engaging convex portions 5a and 7a to engage with the engaging concave portion io. , 1i
are engaged with each other, and the lens 1 is fixedly held at a predetermined position on the lens barrel 2. Therefore, according to the invention, lens 1
There is no need for a retaining ring like in the past when fixing and holding on [j12], which limits the number of parts and reduces manufacturing and assembly man-hours, resulting in lower costs. In addition, since the lens 1 can be fixed and held on the lens barrel 2 by simply rotating the lens 1, the work efficiency of the assembly work is improved, and the lens 1 can be held with a reliable holding force at all times, making it unnecessary to use the lens 1. There is no need to tighten it any further or loosen it after fixing. Also,
Since the lens body 3 is not configured to be directly tightened and fixed, the lens body 3 is not deformed or distorted or damaged during fixation, and predetermined optical characteristics can simply be maintained. It is something. . In addition, Tani Arashi s 6 of the support arm portion 5.

The lens 1 is fixedly held on the lens barrel 2 by elastically deforming the lens 7 in the thrust direction, so deformation of the lens 1 can be absorbed even in areas with relatively large temperature changes, expanding the applicable range of use. can.

A second embodiment of the present invention is shown at line b in FIG. The feature of this embodiment is that the engaging convex portions 6a, 7a of the lens 1 shown in FIGS. The lens holding piece s8, which is provided on the side surface portion) and has engaging concave portions io and ti which can be freely fitted with the engaging convex portions 6a and 7a, is divided into two lens holding pieces 12 and 13. The lens holding pieces 12 and 13 are provided with chamfered portions 12a and 13a for facilitating engagement with the engaging convex portions 6a and 7a. The gap between the lens holding pieces 12 and 13 is set to be narrower than the member height E of the engaging protrusions 6a and 7a, so that the engaging protrusions 6a and 7a are spaced between the lens holding pieces 12 and 13. The arm pieces 6 and 7 are configured to be elastically deformed in a direction that reduces the member height E when inserted into the body. Then, the engagement convex portions 5a and 7a fit into the engagement concave f110.11 due to the force of the base during elastic deformation, and the lens 1 is fixedly held on the lens barrel 2.

Note that the other configurations, functions, and effects are the same as those of the first embodiment, so illustrations and explanations thereof will be omitted.

9 to 11 show a third embodiment of the present invention. The feature of this embodiment is that a plurality of support arms 5 are arranged on the outer circumferential surface 4 of the lens body 3, and the engagement convex portion 5a at the tip of the support arm 5 and the inner circumferential surface 9 of the lens housing part of the lens barrel 2 are arranged.
The lens 1 is configured to be fixedly held on the lens barrel 2 by fitting into the engaging recess 14 of the lens holder m8 fixed to the lens holder m8. The height F from the lens contact surface 15 of the lens barrel 2 to the lower surface of the lens holder 8 is determined by the height F from the lens contact surface 15 to the lower surface of the lens holder 8.
The height to the top surface is set appropriately lower than 0, and when the engagement convex portion 5a and the engagement recess 14 are fitted, the support arm portion 5 is moved in the thrust direction as shown in FIG. They fit together while being elastically deformed. In addition, 5b, 8c
The area shown in is the Hoai River chamfer capital.

The operation of the above embodiment will be explained. Lens 1 to barrel 2
When assembling and fixing, the lens 1 is rotated after being inserted into the housing section of the lens barrel 2. Then, Figure 11 a, b
The chamfered portions 5b and 9c shown in are engaged with each other. Further rotation causes the engaging recess 5a to move downwardly along the inclined surface of the chamfered portion 8C, thereby elastically deforming the support arm 5 in the thrust direction (downward in FIG. 9). Then, when the engagement convex portion 5a is rotated to a position corresponding to the engagement concave portion 14, the engagement concave portion 5a is fitted into the engagement concave portion 14 by the mechanical force of the support arm portion 5, and the lens 1 is fixedly held on the lens barrel 2. Furthermore, the mutual retaining portions 5a.

Even after the lenses 14 are fitted together, the support arm 5 continues to have a restoring action, so that the lens 1 can be held against the lens barrel 2 more reliably. The other configurations, operations, and effects are the same as those of the first embodiment, so their explanations will be omitted.

12 and 13 show a fourth embodiment of the present invention. The feature of this embodiment is that the supporting arm portion 5 having the vertical groove 16 in the thrust direction is integrally provided with the lens body 3, and the end portion of the vertical groove 16 is provided with an elastically deformable engagement convex portion 5a. , 5a, and on the other lens barrel 2 side, a vertically elongated lens holding part 8 in the thrust direction that can be freely fitted into the longitudinal groove 16 is fixed, and on the side surface of the lens holding part 8, an engaging convex part 5a is provided.
It is constructed by recessing an engaging recess 11 that can be freely fitted into the engaging recess 11. Note that reference numerals 18 and 19 indicate chamfered portions for smooth engagement between the support arm portion 5 of the lens 1 and the lens holding portion 8 of the lens barrel 2.

According to the above configuration, the lens 1 can be fixedly held in the lens barrel 2 simply by inserting the lens 1 into the lens barrel 2, and so-called one-touch mounting is possible. The other configurations, operations, and effects are the same as those of the first embodiment, so their explanations will be omitted.

14 and 15 show a fifth embodiment of the present invention. The feature of this embodiment is that the lens 1
The support arm s5 is bent in the thrust direction, and a notch 20 is provided in the bent portion to facilitate elastic deformation. 2 is formed by forming a convex portion for engagement with 2. The inner circumferential surface 9 of the lens housing portion in the lens barrel 2 is formed into a tapered surface, as shown in FIG. An engagement recess 21 for fitting the engagement protrusion 5a of the support arm 5 is provided.

In the above configuration, when the lens 1 is inserted into the lens barrel 2,
The engaging convex portion 5a of the support arm portion 5 is gradually pressed inward by the tapered surface of the inner peripheral surface 9 of the lens storage portion, and the support arm portion 5 is elastically deformed in the radial direction (inward direction). Then, when the lens 1 is further inserted and the lens 1 comes into contact with the contact surface 15, the retaining surface ff1i5a and the engagement recess 21 are fitted together, and the lens 1 is moved by the restoring force of the support arm 5. It is securely fixed to the lens barrel 2. Note that the other configurations, functions, and effects are the same as those of the first embodiment, so their explanations will be omitted.

Effects of the Invention As described above, according to the present invention, the number of component parts of the lens holding device can be reduced, the number of manufacturing steps and assembly steps can be reduced, and costs can be reduced. Further, when the lens is fixed, the lens is not distorted or scratched, the optical character characteristics of the lens can be properly maintained, and the lens can be held securely.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the prior art, FIGS. 2 to 1 are explanatory diagrams showing the first embodiment of the present invention, and FIGS. 8a and 8b are main parts of the second embodiment of the present invention. Explanatory diagrams, Figures 2 to 1 a and b are explanatory diagrams of the third embodiment of the present invention, Figure 12 awbslf
Figures 13a and 13b are explanatory views showing a fourth embodiment of the present invention, and Figs. 14 and 15 are explanatory views showing a fifth embodiment of the present invention. 1...Lens 2...Adjustment barrel 3...Lens body 5...Support arm parts 5a, 6a, 7a...Engagement convex part 8...Lens holding part 10.11, 14, 17 , 21... Engagement recess Fig. 1 Fig. 2/Q Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 11 (C1) (b) Fig. 12 Fig. 13 Fig. 7 (b) Procedural amendment (spontaneous) February 16, 1980 Director-General of the License Agency Kazuo Wakasugi 1988 Patent Application No. 204'394 Name of the invention Person who amended the holding device for a plastic lens Relationship to the case Patent applicant address 2-43-2 Hatagaya, Shibuya-ku, Tokyo Agent Figure 13 (CI)

Claims (4)

[Claims] (1) A lens in which an appropriate number of elastically deformable support arms equipped with projections or recesses for engagement with the lens barrel are arranged on the outer periphery of the lens body, and the engagement projections or recesses of the support arms. A plastic lens holding device consisting of a lens barrel having a recessed or convex shoulder lens holding portion that can be freely fitted therein. (2) The holding device for a glass lens according to claim 1, wherein the support arm portion is configured to be elastically deformable in the thrust direction of the lens body. (3) The plastic lens holding device according to claim 1, wherein the support arm is configured to be elastically deformable in the circumferential direction of the lens body. (4) The plastic lens holding device according to claim 1, wherein the supporting arm portion is configured to be elastically deformable in the radial direction of the lens body.