JPS6064316A - Lens holding device - Google Patents

Abstract

PURPOSE:To fit a lens easily without any strain by forming plural corresponding recessed and projection parts to a shoulder part which holds a lens in a lens frame and a lens supporting part provided ouside of the effective diameter of the lens, and locking the lens. CONSTITUTION:Plural recessed parts 12 for coupling are provided to an annular shoulder part 11 provided in the lens frame 10. The projection parts 22 which engage with the recessed parts 12 for coupling are provided to the lens supporting part 21 provided outside of the effective diameter of the lens 20, and the lens 20 is inserted into the lens frame 10 to engage the projection part 22 with the recessed parts 12. In this case, the same effect is obtained even when the recessed part and projection parts are provided to the lens side and lens frame side reversely. The recessed and projection parts are circular and also elliptic, etc. Further, projection or recessed parts are formed at both sides of the supporting part 21 of the lens 20 and the 2nd and the 3rd lenses or spacers are locked to constitute a composite lens system. The recessed parts and projection parts are formed of materials which deforms elastically. Thus, a lens system is assembled easily without any damage to lenses.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens holding device for holding and fixing an optical lens within a lens barrel.

5-"L" time-! 2. Description of the Related Art Conventionally, as a method for holding lenses necessary for an optical system within a lens barrel, a lens holding device as shown in FIG. 1 is well known.

That is, an annular lens barrel mounting part 2 is provided inside the cylindrical lens frame 1 and projects along the inner wall surface, and a threaded part 3 is screwed onto the inner wall surface behind this lens barrel mounting part 2, and The screw portion 3 is configured such that an annular presser ring 4 can be detachably attached thereto.

Therefore, when the retainer ring 4 is removed from the threaded portion 3 of the lens frame 1, the lens 5 is inserted into the lens frame 1.
into the outer peripheral part 5a'jk of the lens 5 and the lens frame 1.
After contacting the lens barrel mounting surface 2a of the lens barrel mounting portion 2, screw the presser ring 4 into the threaded portion 3, and press the lens 5 toward the lens barrel mounting surface 2a side with the presser ring 4. Accordingly, the lens 5t is fixed within the lens barrel 1.

However, when holding the lens by such a method, the tightening force of the presser ring 4 may cause distortion of the lens 55-, and the holding of the lens 5 may become uncertain due to changes over time. .

Furthermore, when the molding material of the lens 5 is plastic, there are drawbacks such as the presser ring 4 causing scratches on the contact surface of the lens 50.

SUMMARY OF THE INVENTION Accordingly, the present invention eliminates the drawbacks of the conventional lens holding methods and makes it possible to hold a lens reliably and with a simple operation and structure without causing distortion or scratches in the lens frame. The purpose is to provide a lens holding device.

Overview The lens holding device of the present invention includes coupling recesses or coupling recesses provided at respective corresponding positions of the lens barrel attachment surface of the lens barrel attachment portion of the lens barrel and the joint surface of the lens support portion provided outside the effective diameter of the lens. The lens inserted into the lens frame is removably held via the coupling convex part, and in addition, the other bonding surface of the lens support part of the lens is attached to the lens to be bonded to the lens. The lens barrel button of the lens barrel is held through a coupling concave portion or a coupling convex portion provided at a corresponding position on the joint surface of the lens support portion or the joint surface of the spacer portion provided outside the effective diameter. The lens is configured such that a plurality of other lenses t necessary for constructing a lens system can be held at a required interval.

Embodiments Hereinafter, specific embodiments of the lens holding device of the present invention will be described with reference to the drawings.

FIG. 2 is a longitudinal sectional side view showing the first embodiment of the lens holding device of the present invention. In the figure, 10 is a cylindrical lens frame, and inside this lens frame 1o, a wall surface 10alCa5 has an annular lens assembly. Part 11'! ! : In addition, the lens barrel attachment surface 11a of this lens barrel attachment portion 11 is provided with a lens barrel attachment surface 11a in the support portion 21 of the lens 2o, which will be described later.
A coupling concave portion 12 corresponding to the coupling convex portion 22 protruding from the bonding surface 21a is provided.

Reference numeral 20 denotes a lens held in the lens frame 1o, and a lens support portion having an outer diameter equal to or slightly smaller than the inner diameter of the lens frame 1o is provided on the outer periphery of a lens body 20a having an effective diameter of the lens 20. 21, and one joint surface of the lens support portion 21, which is the joint surface 21a with the lens barrel attachment surface 11a of the lens barrel 10, is provided with a coupling portion that is coupled to the four coupling portions 12 of the lens barrel attachment surface 11a. A convex portion 22 is provided in a protruding manner.

Further, the four coupling parts 12 and the coupling convex part 22 provided on each of the lens barrel mounting surface 11a and the joint surface 21a of the lens support part 21 are provided at corresponding positions, and both are formed to be elastically deformable with respect to each other. It is configured so that it can be removably fitted.

That is, specific examples of the arrangement and shape of the coupling recess 12 and the coupling convex part 22 are shown in FIGS. When a plurality of coupling convex parts 22 are provided on the same circumferential line on the joint surface 21a of the lens support part 21 in the same figure, each coupling convex part 22 adjacent to each other on two concentric circles is provided in the same figure. Figures 6a and 6b both show a case in which the connecting convex parts 22 are provided in a hemispherical shape, while Figure wJ6C When the coupling protrusions 22' each having a rectangular shape are arranged at equal intervals, FIG.
A coupling convex portion 22" having an oval shape longer than 2'
This figure shows a case in which they are arranged at equal intervals in the circumferential direction of the joint surface 21a of the k lens support part 21.

Note that FIG. 6 a % d only shows the coupling convex portions 22 on the lens 20 side, but the four coupling portions 12 on the lens barrel 10 side are the same as the respective coupling convex portions 22 in FIG. 6 a % d.
, 22', and 22' are provided on the lens barrel mounting surface 11a, and the detailed structure thereof will be omitted in the drawings.

However, the cross-sectional shape of the coupling recess 12 is shown in FIG.
Specifically shown in FIG. 1C, FIG.
FIG. 7 shows a trapezoidal coupling recess 12', and FIG. illustration is omitted.

Thus, each of the above-mentioned coupling recesses 12 is replaced by each coupling protrusion 22.
The lens frame 10 and the lens 20 are configured so that they can be forcibly fitted together or separated from each other using elastic deformation (for example, the undercut configuration shown in the figure).
By forming the entire lens barrel part 11 and the lens support part 21 from plastic, the desired effect between the coupling concave part s12 and the coupling convex part 22 can be effectively obtained. be able to.

Note that the arrangement and shape of each coupling recess 12 and each coupling protrusion 22 are not limited to the arrangement and shape shown in the drawings. The cross-sectional shape may be configured in various shapes such as a hemispherical shape, a trapezoidal shape, and a shape approximating a single-letter shape.

Now, a lens 20 is placed inside the lens barrel 10 having the above configuration.
When holding the lens barrel 10, the lens barrel mounting surface 1 of the lens barrel 10
Insert the lens 20 into the lens frame 1 from the opening on the side opposite to 1a.
0, and each coupling convex portion 22 provided on the joint surface 21a of the lens support portion 21 of the lens 20 is connected to the lens barrel attachment surface 1.
By forcibly fitting into each coupling recess 12 of 1a, the lens 20 can be bonded while still being in perfect contact with the bonding surface 21a' of the lens support portion 21 and the lens barrel attachment surface 11a of the lens barrel attachment m11. At the same time, the lens 20' and the lens frame 10 can be held in this state.

FIG. 3 is a longitudinal cross-sectional side view showing a second embodiment of the lens holding device of the present invention, in which each coupling member provided on the joint surface 21a of the lens barrel attachment surface 11a and the lens support portion 21 in the first embodiment shown in the second figure. With respect to the structure of the concave portion 12 and the coupling convex portion 22, each coupling convex portion 13 corresponding to each coupling convex portion 22 is provided on the lens barrel mounting surface 11a, and the bonding surface 2 of the lens support portion 21
In 1a, each coupling recess 23 corresponds to each of the four coupling parts 12.
It is constructed by providing each coupling convex portion 13
The arrangement, shape, and other configurations of each of the coupling recesses 23 are the same as those of the coupling convex parts 22 and the four coupling parts 12 of the first embodiment, so the explanation thereof will be omitted, and the other a configurations will also be omitted. , is the same as the first embodiment, so the same number Z is given to it, and the explanation thereof will be omitted.

FIG. 4 is a longitudinal sectional side view showing a third embodiment of the lens holding device of the present invention, in which each coupling convex portion on the joint surface 21a of the lens barrel attachment surface 11a and the lens support portion 21 is In the structure of the concave portion, the four coupling portions 12 or the coupling convex portions 13 are provided on the lens barrel mounting surface 11a, and the coupling convex portions 22 or the coupling concave portions 23 are provided on the joint surface 21a of the lens support portion 21. For example, in each arrangement position of the lens barrel mounting surface 11a, if a coupling recess 12 is provided at one of the mutually opposing positions, a coupling convex part 13 is provided at the other opposing position. Similarly, a coupling recess 12 and a coupling convex part 13 are provided at each of the other facing positions, and a coupling convex part 22 and a coupling concave part 23 are also provided on the joint surface 21a of the lens support part 21 with the same structure. In the illustrated case, a coupling convex part 13 is provided at the upper position of the lens barrel attachment surface 11a, a coupling recess 12 is provided at the lower position opposite to this, and the other lens A coupling recess 23 is provided at the upper position of the joint surface 21a of the support portion 21, and a coupling protrusion 22 is provided at the lower position facing the joint surface 21a.

As described above, since the coupling concave portion and the coupling convex portion between the lens barrel attachment surface 11a and the joint surface 218 of the lens support portion 21 are configured in a mutually corresponding relationship, the lens barrel attachment surface
1a and the joint surface 21a are not limited to the embodiment in which only a coupling recess or a coupling protrusion is provided on one side and only a coupling protrusion or only four coupling parts on the other side, and the coupling recess and the coupling protrusion are provided. may be implemented alternately or in any other mixed arrangement.

The other configurations are the same as those in the first and second embodiments, so the same numbers are given and explanations thereof will be omitted.

FIG. 5 is a longitudinal sectional side view showing the fourth to sixth embodiments of the lens holding device of the present invention, and in particular, one lens 20 of the first to third embodiments.
In the fourth embodiment shown in FIG.
The configuration of the joint surface 21a of the lens support portion 21 is the same as that of the first embodiment, and the configuration for holding the lens 20 within the lens barrel 10 is also the same.

However, the bonding surface 21b of the lens support n521 of the lens 20 on the opposite side to the bonding surface 21a is positioned at the same position as each coupling convex portion 22 provided on one of the bonding surfaces 21a. Each coupling convex part 24 corresponding to each coupling concave part 32 of the joint surface 31a of the spacer part 31 provided outside the effective diameter of the concave lens 30 as a second lens constituting the lens system together with the lens 20 is protrudingly provided. It is.

30 is the lens 20 in the lens barrel 10.
It is a concave lens that together constitutes a lens system, and on the outer periphery of the lens body 30a corresponding to the effective diameter of this concave lens 30,
A cylindrical spacer portion 31 having an outer diameter approximately equal to or slightly smaller than the inner diameter of the lens barrel 10 and an inner diameter equal to or larger than the effective diameter of the lens body 20a of the lens 20.
is formed integrally with the spacer portion 31, and is elastically deformable on the joint surface 31a of the spacer portion 31 with the other joint surface 21a of the lens 20, at a position facing each of the coupling convex portions 24 of the joint surface 21b. It is formed by providing respective coupling recesses 32 that can be coupled to.

Therefore, when holding the concave lens 30 as the second lens having the above configuration in the lens frame 10, the lens 30 is moved from the spacer part 311110 to the opening on the side of the lens 20 already held by the lens frame. 10, and connect each coupling recess 32 of the joint surface 31a of the spacer part 31 to the joint surface 21b of the lens support part 21 of the lens 20.
By forcibly fitting each coupling convex portion 24 in the lens 30y! using the elastic deformation action of both lenses, the lens 30y!
- The lens 20 can be held within the lens frame 10 with the spacer portion 31 interposed therebetween.

In addition, FIG.
In this embodiment, the third lens 4
On the outer periphery of the lens body 40a corresponding to the effective diameter of 0, a lens support part 41 is protrudingly provided to be held between the cemented surface 21b of the lens support part 21 of the second lens 20 and the spacer part 31 of the second lens 30. This configuration is achieved by providing an engaging recess 33'a' of the lens support section 41 of the third lens 40 inside the spacer section 31 of the second lens 30.

Furthermore, FIG. 5C shows a sixth embodiment, in particular the fourth,
This example shows an example in which a plurality of lenses are held without intervening the spacer portion 31 in place of the fifth example.

The structure of the lens 20 is the same as that of the fourth and fifth embodiments, but the lens frame 10 is attached to the outer periphery of the lens bodies 50a and 60a, which are formed by the effective diameters of the M2 lens 50 and the third lens 60, respectively. A lens support portion 51.61 having an outer diameter approximately equal to or slightly smaller than the inner diameter is provided, and one cemented surface 51a of the lens support portion 51 of the second lens 50 (that is, the cemented surface of the lens support portion 21 of the lens 20) is provided. 21
b), each elastically deformable coupling concave portion 52 corresponding to each coupling convex portion 24 on the bonding surface 21b of the lens support portion 21 of the nest lens 20 is provided, and the other bonding surface 51
b (that is, the cemented surface with the cemented surface 61a of the lens support portion 61 of the third lens 60), each of the four coupling portions 62 of the lens 60, which will be described later, is positioned at a position opposite to each of the four coupling portions 52. Each elastically deformable coupling convex portion 53 corresponding to
Further, the lens supporting portion 61 of the third lens 60 is formed by providing a bonding surface 61a of the lens supporting portion 51 of the second lens 50 with the bonding surface 51b of the lens supporting portion 51 of the second lens 50. It is formed by providing elastically deformable coupling recesses 62 corresponding to the coupling protrusions 53 provided in 51b.

Therefore, after holding the second lens 20 in the lens frame 10 in the same manner as in the first or fourth embodiment,
．． The third lenses 50, 60' are sequentially dropped into the lens frame 10, and the coupling recesses 52 of the one joint surface 51a of the second lens 50 and the lens support section 51 are inserted into the lens support section 21 of the lens 20. The joint surface 61a of the lens support portion 61 of the third lens 60 is fitted into each of the joint convex portions 24 by utilizing the mutual elastic deformation action, and the joint surface 61a of the lens support portion 61 of the third lens 60 is fitted to each joint convex portion 53 of the other joint surface 51b. The first and second coupling recesses 62 are fitted by utilizing each other's elastic deformation action.
．． 3 lenses 20, 50, 60 each into lens frame 1
Can be kept within 0.

The configurations of the fourth to sixth embodiments shown in the fifth figure can be implemented while applying the configurations of the first to third embodiments, and the explanation thereof will be omitted and the ml, 2,3 lenses 20.30,40,50,60
Regarding the method of holding each lens in the lens frame 10, after fitting and clamping the first, second and third lenses together,
This lens is dropped into the lens barrel 10, and each coupling convex portion 22 of the lens support portion 21 of the lens 20 is attached to the lens barrel attachment surface 11.
Of course, it is also possible to hold it by fitting it into each coupling recess 12 of H.

As is clear from the above explanation, according to the lens holding device of the present invention, the lens barrel attachment surface of the lens barrel and the lens support portion provided outside the effective diameter of the lens have a plurality of contact points provided at the joint surface of the lens barrel attachment surface and the lens support portion provided outside the effective diameter of the lens. The lens can be inserted into the lens frame through the coupling concave part or each coupling convex part without causing distortion or scratches.
It can be held by a simple operation, and it can be attached to the cemented surface opposite to the cemented surface of the lens support, a spacer part provided outside the effective diameter of the lens to be bonded to this lens, or the cemented surface of the lens support. A lens system consisting of a plurality of lenses can also be held within the lens frame with the same effect through the provided coupling recesses or coupling protrusions, and furthermore, the spacer portion may be interposed. Accordingly, the required distance between each lens of the lens system can be easily configured.

[Brief explanation of drawings]

Fig. 1 shows a conventional lens holding device; Figs. 2 to 4 and Fig. 5 a; Figure 6a
% d is a front view of the lens showing the arrangement of each coupling convex part on the joint surface of the lens support part and the shape of each coupling convex part, and FIGS. FIG. 3 is a cross-sectional view showing the cross-sectional shape of each coupling recess. 10... Lens barrel 11... Lens barrel attachment surfaces 11 a, 21 a, 21 b, 31 a, 51 a. 51b, 61a - joint surface 12.23, 32.52.62... coupling recess 13.
22, 24.53... coupling convex portion 20.30, 40,
50.60... Lenses 20a, 30a, 40a, 50
a, 60a... Lens body 21. 41, 51, 61... Lens support part 31...
Spacer part Figure 5 (b) (C) et al. 2 Code of Publication Showa GO-64316 (8) Figure 6 (0) (b) Procedural amendment (voluntary) Commissioner of the Patent Office Kazuo Wakasugi 1. Display of case 1982 Patent Application No. 172635 2, Title of the invention: Lens holding device 3, Relationship with the person making the amendment: Patent applicant address: 2-43-2-4, Hatagaya, Shibuya-ku, Tokyo, Agent 6, Details subject to amendment "Detailed Description of the Invention" column and Drawings (1) Specification, page 14, lines 17-18, "Each joint surface 2]a..." , YO are deleted. (2) The description ``positioned in a position opposite to each of the four coupling parts 52, and YO'' in lines 15 and 16 of page 17 of the specification is deleted. ( 3) Amend Figure 5 in the drawings according to the attached amended drawing copy. 7. List of attached documents (1) 1 amended drawing copy 2-

Claims (7)

[Claims] (1) In a lens holding device that holds a lens in a lens barrel, a lens barrel mounting surface of the lens barrel and a lens barrel mounting surface of a lens support provided outside the effective diameter of the lens are bonded to each other. , by providing corresponding coupling recesses or coupling protrusions, and coupling the coupling protrusions or coupling recesses of the joint surface of the lens support part to the lens side coupling recesses or coupling protrusions, respectively. . A lens holding device, characterized in that a lens is held within the lens barrel. (2) In a lens holding device for holding a lens in a lens barrel, a joint surface between a lens barrel attachment surface of the lens barrel and a lens barrel attachment surface of a lens support section provided outside the effective diameter of the lens, and A coupling concave portion or a coupling convex portion corresponding to the bonding surface of the lens to be bonded to the lens support portion of the lens to be bonded to the lens is provided, and a bonding concave portion or a coupling convex portion of the lens body mounting surface is provided with a bonding concave portion or a bonding convex portion of the lens to be bonded to the lens. The coupling convex part or coupling concave part provided on one joint surface of the lens support part is coupled to each other, and the coupling concave part or coupling convex part provided on the other joint surface of the lens support part is connected to the lens. A lens holder characterized in that a plurality of lenses are held in the lens frame by mutually joining together recesses for joining or projections for joining provided on the joining surface of the lens support part of the lens to be joined. Device. (3) A lens holding device that holds a lens in a lens barrel is provided with a lens barrel attachment surface of the lens barrel and a lens barrel attachment surface of a lens support provided outside the effective diameter of the lens. A spacer portion provided outside the effective diameter of the lens to be bonded to the lens is provided with a corresponding coupling concave portion or a coupling convex portion on the bonding surface with the lens support portion of the lens, and the lens body is attached to the lens body. The coupling convex portions or coupling concave portions provided on one of the bonding surfaces of the lens support portion of the lens are bonded to the four bonding portions of the surfaces or the bonding surface 9- portion, and the bonding portions of the other bonding surface of the lens support portion of the lens are bonded to each other. The coupling convex part or the coupling concave part provided on the joint surface of the spacer part of the lens to be coupled to the lens is coupled to the coupling concave part or coupling convex part provided on the surface, and then the coupling convex part or coupling concave part provided on the joint surface of the spacer part of the lens to be coupled to the lens is bonded to the coupling convex part or coupling convex part provided on the surface, and A lens holding device characterized by holding a plurality of lenses with spacer portions interposed between the lenses. (4) A patent claim in which the coupling concave portion or coupling convex portion provided on the lens barrel attachment surface of the lens barrel, the joint surface of the lens support portion of the lens, and the joint surface of the spacer portion are formed to be elastically deformable. The lens holding device according to item 1, item 2, or item 5g. (5) The coupling concave portion or the coupling convex portion provided on the lens barrel attaching surface of the lens barrel, the bonding surface of the lens support portion of the lens, and the bonding surface of the spacer portion are connected to the lens barrel attaching portion,
A patent consisting of four annular coupling parts or coupling convex parts along the circumferential direction of the lens support part and the spacer part, or a plurality of coupling concave parts or coupling convex parts arranged at required intervals in the circumferential direction. A lens holding device according to claim 1, 2, or 3. (6) The coupling recess or the coupling convex part has a trapezoidal cross-sectional shape, a T-shape, a circular shape, or any other similar shape. 3. The lens holding device according to item 3 or item 3. (7) The lens holding device according to claim 3, wherein the lenses are held within the lens frame between the lenses held with a spacer portion interposed within the lens frame.