JPH0374366B2 - - Google Patents

Description

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

BACKGROUND 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 so that an annular presser ring 4 can be detachably attached thereto.

Then, press the retaining ring 4 onto the threaded part 3 of the lens barrel 1.
In the removed state, drop the lens 5 into the lens frame 1 and remove the outer peripheral part 5 of the lens 5.
a into contact with the lens barrel attachment surface 2a of the lens barrel attachment section 2 of the lens barrel 1, and then screw the presser ring 4 into the threaded portion 3, and use this presser ring 4 to hold the lens 5 on the lens barrel attachment surface 2a. By pressing toward the 2a side, the lens 5
is fixed within the lens frame 1.

However, when holding the lens using this method, the lens 5 is held by the tightening force of the presser ring 4.
In some cases, distortion occurs in the lens 5, and holding of the lens 5 becomes uncertain due to changes over time.

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

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

Overview The lens holding device of the present invention includes a coupling recess or Through the coupling convex part,
A lens support part that removably holds the lens inserted into the lens frame, and is also provided on the other cemented surface of the lens support part of the lens, and outside the effective diameter of the lens to be joined to the lens. Necessary for constructing a lens system together with the lens held in the lens barrel attachment part of the lens barrel through the coupling concave part or coupling convex part provided at corresponding positions on the joint surface of the spacer part or the joint surface of the spacer part. The lens is configured such that a plurality of other lenses 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 vertical 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 10 is an annular lens along the wall surface 10a. The lens barrel attachment part 11 is provided in a protruding manner, and the lens barrel attachment surface 11a of the lens barrel attachment part 11 is provided with a support part 21 of the lens 20, which will be described later.
The joint surface 21 with the lens barrel mounting surface 11a in
A coupling recess 12 corresponding to the coupling protrusion 22 protruding from a is provided.

Reference numeral 20 denotes a lens held in the lens frame 10, and a lens support portion having an outer diameter equal to or slightly smaller than the inner diameter of the lens frame 10 is provided on the outer periphery of a lens body 20a having an effective diameter of the lens 20. 2
1 is provided on 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, and a coupling recess 12 of the lens barrel attachment surface 11a is provided. A protruding portion 22 is provided.

Further, the coupling recess 12 and the coupling protrusion 22 provided on each of the lens barrel attachment surface 11a and the joint surface 21a of the lens support portion 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, the sixth example shows a specific example of the arrangement and shape of the coupling recess 12 and the coupling protrusion 22.
Figures a to d and Figures 7 a to c, and Figure 6 a.
is the cemented surface 21a of the lens support portion 21 of the lens 20
When a plurality of coupling protrusions 22 are provided at equal intervals on the same circumferential line in , Figure b shows that the coupling protrusions 22 adjacent to each other on two concentric circles are arranged in a zigzag shape with respect to each other. Figures 6a and 6b both show the case in which a coupling convex portion 22 having a hemispherical shape is provided.
Fig. 6c shows a coupling convex portion 2 having a rectangular shape.
If they are arranged at equal intervals between 2', Fig. 6d
2 shows a case where coupling protrusions 22'' each having an oval shape longer than the coupling protrusions 22' are arranged at equal intervals in the circumferential direction of the joint surface 21a of the lens support portion 21.

Although FIGS. 6 a to 6 d only show the coupling convex parts 22 on the lens 20 side, the coupling concave parts 12 on the lens barrel 10 side are the same as the coupling convex parts 22 in FIGS. 6 a to d. , 22', and 22'' are provided on the lens barrel attachment surface 11a, and the specific configuration thereof will be omitted in the drawings.

However, as specifically shown in FIGS. 7a to 7c, the cross-sectional shape of the coupling recess 12 is an undercut shape with a narrow entrance and widening inward. That is, FIG. 7a shows a hemispherical coupling recess 12 corresponding to the hemispherical coupling convex 22, FIG. 7b shows a trapezoidal coupling recess 12', and FIG. 7c shows a T-shaped coupling recess 12'. The coupling concave portions 12'' are respectively shown, and conversely, the coupling convex portions 22 corresponding to the respective coupling concave portions 12' and 12'' are not illustrated.

Therefore, each of the above-mentioned coupling recesses 12 and each coupling convex part 22 are configured so that they can be forcibly fitted into or separated from each other by utilizing elastic deformation (for example, the undercut configuration shown in the figure). Something,
Either the lens barrel 10 and the lens 20 are entirely made of plastic, or the lens barrel mounting portion 11 is made of plastic.
By forming the lens support portion 21 and the lens support portion 21 from plastic, the desired effect between the coupling concave portion 12 and the coupling convex portion 22 can be effectively obtained.

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, and for example, from one annular coupling recess and coupling protrusion (not shown). The cross-sectional shape can be configured in various shapes such as a hemispherical shape, a trapezoidal shape, and a shape approximating a T-shape.

Now, when holding the lens 20 in the lens barrel 10 having the above structure, the lens 20 is dropped into the lens barrel 10 from the opening on the side opposite to the lens barrel attachment surface 11a of the lens barrel 10. , lens 2
By forcibly fitting each coupling convex part 22 provided on the joint surface 21a of the lens support part 21 of lens 20 into each coupling concave part 12 of the lens barrel attachment surface 11a, the lens support part 21 of the lens 20 is fixed. The bonding surface 21a can be bonded to the lens barrel mounting surface 11a of the lens barrel mounting portion 11 while being in tight contact with the lens barrel mounting surface 11a, and at the same time, the lens 20 can be held within the lens barrel 10 in this state.

FIG. 3 is a longitudinal sectional side view showing a second embodiment of the lens holding device of the present invention. 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 attachment surface 11a, and each coupling convex portion 13 corresponding to each coupling convex portion 22 is provided on the joint surface 21a of the lens support portion 21. Each coupling recess 23 corresponding to the coupling recess 12
The arrangement, shape, etc. of each coupling protrusion 13 and each coupling recess 23 are the same as those of each coupling protrusion 22 and coupling recess 12 of the first embodiment. Therefore, the explanation thereof will be omitted, and since the other configurations are the same as those of the first embodiment, the same numbers will be given 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 configuration of the concave portion, the first and second embodiments include providing the coupling concave portion 12 or the coupling convex portion 13 on the lens barrel mounting surface 11a, and providing the coupling convex portion 22 or the coupling concave portion 23 on the joint surface 21a of the lens support portion 21. For example, in each arrangement position of the lens barrel attachment surface 11a, if a coupling recess 12 is provided at one of the mutually opposing positions, a coupling convex part 12 is provided at the other opposing position.
Similarly, a coupling concave part 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 are provided on the joint surface 21a of the lens support part 21 with the same structure. 23, and in the illustrated case, the coupling convex portion 13 is located above the lens barrel attachment surface 11a.
A coupling recess 12 is provided at the lower position facing this, and a coupling recess 23 is provided at the upper position of the joint surface 21a of the lens support 21, and a lower side facing this is provided. There is a connecting convex part 2 at the position.
2 is shown.

In this way, since the coupling concave portion and the coupling convex portion between the lens barrel attachment surface 11a and the bonding surface 21a of the lens support portion 21 are configured in a corresponding relationship, the lens barrel attachment surface 11a and the bonding surface 21a are The present invention is 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 a coupling recess on the other, but it is possible to alternately provide a coupling recess and a coupling protrusion or in other ways. It is possible to provide and implement under any mixed arrangement state of.

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 vertical sectional side view showing the fourth to sixth embodiments of the lens holding device of the present invention, particularly the first to third embodiments.
In contrast to the configuration in which one lens 20 is held in the lens barrel 10, two or more lenses 20, 3
This shows an example in which 0, 40, 50, and 60 are held.

In the fourth embodiment shown in FIG. 5a, the lens barrel 1
0 and the structure of the cemented surface 21a of the lens support portion 21 of the lens 20 are the same as in the first embodiment, and the structure for holding the lens 20 within the lens barrel 10 is also the same.

However, the lens support portion 21 of the lens 20
On the joint surface 21b opposite to the joint surface 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 a lens system together with the lens 20 described later is provided in a protruding manner. It has been done.

Reference numeral 30 denotes a concave lens that constitutes a lens system together with the lens 20 in the lens frame 10. On the outer periphery of the lens body 330a, which corresponds to the effective diameter of the concave lens 30, there is a diameter approximately equal to the inner diameter of the lens frame 10. A slightly smaller outer diameter and the lens 2
A cylindrical spacer part 31 having an inner diameter equal to or larger than the effective diameter of the lens body 20a of 0 is integrally formed, and this spacer part 31
On the joint surface 31a with the other joint surface 21a of the lens 20, each coupling recess 32 that can be elastically deformably coupled to the coupling convex section 24 of the bonding surface 21b is provided. It is formed by providing.

Therefore, when holding the concave lens 30 as the second lens having the above-mentioned structure in the lens barrel 10, the lens 30 is inserted into the lens mirror from the spacer part 31 side through the opening on the lens 20 side already held. The lens 20 is inserted into the frame 10, and each coupling recess 32 of the joint surface 31a of the spacer part 31 is inserted into the lens 20.
By forcibly fitting the coupling convex parts 24 on the joint surface 21b of the lens support part 21 using the elastic deformation action of both, the lens 30 is connected to the lens 20, and the spacer part 31 is It can be held within the lens barrel 10 while being interposed.

Further, FIG. 5b shows a fifth embodiment, especially the fourth embodiment.
In this embodiment, the third lens 40 is held between the first and second lenses 20 and 30, and the outer periphery of the lens body 40a corresponding to the effective diameter of the third lens 40 has a first lens. A lens support part 41 is provided protrudingly between the cemented surface 21b of the second lens support part 21 and the spacer part 31 of the second lens 30, and a third lens 40 is provided inside the spacer part 31 of the second lens 30. Lens support part 4
It is constructed by providing one engagement recess 33.

Furthermore, FIG. 5c shows a sixth embodiment, and particularly shows an embodiment in which a plurality of lenses are held without intervening the spacer portion 31 in place of the fourth and fifth embodiments.

Thus, the configuration of the first lens 20 is similar to that of the fourth and fifth embodiments, but the second lens 50 and the third lens
On the outer periphery of the lens bodies 50a, 60a each having an effective diameter of the lens 60, lens supports 51, 61 having an outer diameter that is approximately the same as or slightly smaller than the inner diameter of the lens barrel 10 are provided, and the lens of the second lens 50 is provided. One cemented surface 51a of the support portion 51 (i.e., the cemented surface 2 of the lens support portion 21 of the lens 20)
1b), each coupling convex portion 2 on the bonding surface 21b of the lens support portion 21 of the first lens 20
Each elastically deformable coupling recess 52 corresponding to No. 4
and the other bonding surface 51b (that is, the bonding surface with the bonding surface 61a of the lens support portion 61 of the third lens 60), each coupling recess 6 of the lens 60, which will be described later.
Each elastically deformable coupling convex portion 53 corresponding to No. 2
are formed by providing each of them, and further,
The cemented surface 61a of the lens support portion 61 of the third lens 60 and the cemented surface 51b of the lens support portion 51 of the second lens 50 is attached to the cemented surface 5 of the lens support portion 51.
It is formed by providing elastically deformable coupling recesses 62 corresponding to the coupling protrusions 53 provided in 1b.

Therefore, after holding the first lens 20 in the lens frame 10 in the same manner as in the first or fourth embodiment, the second and third lenses 50 and 60 are sequentially dropped into the lens frame 10, Each coupling concave portion 52 of one joint surface 51a of the second lens 50 lens support portion 51 is connected to each coupling convex portion 24 of the lens support portion 21 of the first lens 20 by utilizing mutual elastic deformation. While fitting, the other joint surface 51b
By fitting each coupling concave part 62 of the joint surface 61a of the lens support part 61 of the third lens 60 to each coupling convex part 53 of the first, 2,3 lens 20,50,6
0 can be held within the lens barrel 10.

Note that the configurations in the fourth to sixth embodiments shown in the fifth figure can be implemented while applying the configurations in the first to third embodiments, and the explanation thereof will be omitted and the configurations in the first to sixth embodiments shown in FIG. ,2,3 lens 2
0, 30, 40, 50, and 60 lenses in the lens frame 10, the first, second, and third lenses are fitted and clamped together in advance, and then dropped into the lens frame 10. Including, first lens 20
Of course, it is also possible to hold the lens by fitting each coupling convex part 22 of the lens support part 21 into each coupling concave part 12 of the lens barrel mounting surface 11a.

Effects of the Invention As is clear from the above description, according to the lens holding device of the present invention, 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. Through the provided coupling recesses or coupling protrusions, the lens can be held in the lens frame by a simple operation without distortion or scratches, and the bonding surface of the lens support portion Through each coupling concave part or each coupling convex part provided on the joint surface on the opposite side of the lens, a spacer part provided outside the effective diameter of the lens to be joined to this lens, or a joint surface of the lens support part,
A lens system consisting of a plurality of lenses can also be held within a lens frame with similar effects, and by interposing the spacer section, the necessary distance between each lens of the lens system can be easily configured. It is something that can be done.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view showing a conventional lens holding device, FIGS. 2 to 4 and FIGS. 5 a to c are longitudinal side views showing first to sixth embodiments of the lens holding device of the present invention,
Figures 6 a to d are front views of the lens showing the arrangement and shape of each coupling convex part on the joint surface of the lens support part, and Figures 7 a to c are lenses of the lens frame. FIG. 3 is a cross-sectional view showing the cross-sectional shape of each coupling recess provided in the barrel mounting surface. 10... Lens mirror frame, 11... Lens barrel attachment part,
11a, 21a, 21b, 31a, 51a, 51
b, 61a...joint surface, 12, 23, 32, 5
2, 62...Connection recess, 13, 22, 24, 5
3...Connecting convex portion, 20, 30, 40, 50, 6
0...Lens, 20a, 30a, 40a, 50
a, 60a...Lens body, 21, 41, 51,
61... Lens support part, 31... Spacer part.

Claims (1)

[Scope of Claims] 1. A lens holding device that holds a lens within a lens barrel, comprising: a lens barrel attachment surface of the lens barrel; and a lens support portion integrally provided with the lens outside the effective diameter of the lens. and a joint provided in a recessed or protruding direction along the lens optical axis in an undercut shape that is press-fitted to the lens mounting surface and the joint surface of the lens support section to the lens mounting surface, respectively. a coupling recess or a coupling convex part; A lens holding device characterized by being press-fitted together. 2. In a lens holding device that holds at least a first lens and a second lens in a lens barrel, a lens barrel attachment surface of the lens barrel and a portion integral with the first lens outside the effective diameter thereof are provided. a lens support portion provided on the second lens; a spacer portion that is integral with the second lens and extends in a direction parallel to the optical axis of the lens; A coupling recess or a coupling convex part provided in an undercut shape and recessed or protruding in a direction along the lens optical axis so as to be press-fitted to the joint surface of the lens support part to the lens barrel mounting surface, respectively; , an undercut shape that is recessed or protrudes along the lens optical axis, and is press-fitted to the surface of the lens support portion opposite to the joint surface to the lens barrel mounting surface and the end surface of the spacer portion, respectively; a coupling recess or a coupling protrusion provided on the lens barrel mounting surface; The spacer part is characterized in that the recesses are press-fitted together, and the convexity or concavity provided on the end surface of the spacer part is press-fitted into the concavity or convexity provided on the opposite surface. A lens holding device.