JPS5887504A - Lens holding device - Google Patents

Abstract

PURPOSE:To simplify an operation for installing a lens to a lens frame, and to elastically absorb deformation of the lens, etc., by holding the lens by a tapered surface of the lens to be hled, a stopper for controlling the lens to be held, in the optical axis direction, and an elastic part for pressing this tapered surface. CONSTITUTION:A lens to be held 10 has an inclined tapered surface 12 on its outside circumference 10a. An elastic piece 13 projected in the inside direction from a wall surface 11a of the inside circumferential side of a lens frame 11 projects a stopper 14 for controlling the lens 10 in the optical axis direction, and they are formed as one body. The projecting direction of each elastic piece 13 is constituted in accordance with a gradient of the tapered surface 12 of the lens 10. The outside diameter of the lens 10 and the inside diameter between each elastic piece 13 are set so that the lens 10 can be held by each elastic piece 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens holding device, and particularly to a lens holding device that is easy to attach a lens to a lens frame, and elastically absorbs deformation of the lens due to changes in lens diameter, thickness, or other changes. It is an object of the present invention to provide a lens holding device that can always hold a lens in a correct position with respect to a lens frame while correcting misalignment, inclination, etc. when the lens is held in a lens frame.

Conventionally, as a holding device for a lens barrel, a holding device for a lens barrel is placed on the inner periphery of a lens barrel 1, as shown in figure s1.

A lens fitting part 4 having a stepped part 3 for abutting the lens 2 is provided, and a threaded part 5 is screwed onto the front inner periphery of the lens fitting part 4 to constitute a lens holding part on the lens frame 1. . Then, after fitting the outer part 2a of the lens 2 inserted from the opening side of the lens frame 1 with its back side in contact with the stepped part 3 side, the lens holding part of the lens frame 1 is attached to the outer periphery. An annular presser l16 having a threaded part 6& that is screwed into the threaded part 4 of the threaded part 4
The outer peripheral part 2a of the lens 2 is screwed onto the outer peripheral part 2a of the lens 2 by the presser ring 6.
The back surface of the holder is pressed against and fixed to the stepped portion 3.

According to the above-mentioned conventional lens holding device, there is a tolerance value in terms of processing accuracy between the lens fitting part 4 in the lens holding part of the lens frame 1 and the lens 2 itself, and the force between them is equal to the tolerance value. The occurrence of backlash is unavoidable, and when the lens 2 is held in the lens frame 1, the center misalignment occurs by the above-mentioned allowable value.

Moreover, when the lens 2 is a plastic lens, the above-mentioned tolerance must be set even larger due to dimensional changes due to temperature or variations between lenses during molding.

Incidentally, the allowable values for a lens with a diameter of 20 cm are as shown in Table 1 below, and it is clear that the maximum misalignment in the case of a plastic lens is 0.05 mm.

Table 1 In addition, in the above-mentioned conventional lens holding device, it is difficult to tighten the lens 2 by screwing the presser ring 6 into the threaded portion 5 of the lens frame 1, and it is difficult to adjust the tightening direction uniformly, and the shape of the lens changes. The deformation caused by this phenomenon cannot be absorbed, and the occurrence of misalignment or inclination of the lens can be prevented.

Furthermore, there are drawbacks such as the fact that it takes time and effort to attach the lens 2 to the lens frame 1.

Moreover, as a lens holding device,
No. 4 or Utility Model Application Publication No. 55-57709 proposes a method for writing, but no measures are taken against misalignment or tilting of the lens, and no other considerations are necessary to eliminate the above-mentioned drawbacks. Nothing has been omitted.

In particular, when using a plastic lens, there is no structure for absorbing the change in outer diameter caused by a temperature of 11 degrees, and the lens holding mechanism still suffers from accuracy problems caused by the various points mentioned above. .

Therefore, the present invention has been developed in view of the above-mentioned conventional lens holding device, specifically as follows.

It is characterized by comprising a taper provided on the lens to be held, a stopper that restricts the lens to be held in the optical axis direction, and an elastic portion that presses the tapered surface of the lens to be held.

Embodiments of the lens holding device according to the present invention will be described below with reference to the drawings.

Reference numeral 10 denotes a lens as a held lens held in a lens frame 11, and a tapered surface 12 inclined in one direction is provided on the outer periphery 10a of this lens 1o.

Reference numeral 13 denotes an elastic piece as an elastic part protruding inward from the aI surface 11 & on the inner circumferential side of the lens frame 11, and a stopper is provided at the protruding plate end 131 of each elastic piece 13 to restrict the lens 10 in the optical axis direction. 14 is integrally formed with protruding parts.

Further, regarding the protruding direction of each elastic piece 13, the above-mentioned lens 1
The drawing shows a case in which four elastic pieces 13 are arranged facing each other between the lens frame 11 in the inner circumferential direction. The number of pieces 13 is not limited to this, and the structure in which the pieces 13 are provided is not limited to integral molding, as will be explained in the following embodiments.

Further, the outer diameter of the lens 10 and the inner diameter between the elastic pieces 13 are set and configured so that the lens 10 can be elastically held by each elastic piece 13, and the inner diameter between the stoppers 14 of each elastic piece 13 is set and configured. In contrast, the lens 10 is configured to have a large diameter.

The lens 10 may be made of plastic or glass, and the lens frame 11 may be made of synthetic resin such as polycarbonate.

In order to hold the lens 10 in the lens frame 11 having the above structure, the lens 1o is inserted from the right side of the lens frame 11 in FIG.
When the lens 1o is forcibly pushed in, the maximum outer diameter portion of the lens 1o hits the stopper 14 while each of the opposing elastic pieces 13
When the lens 10 is pushed outward and the maximum outer diameter portion of the lens 10 overcomes the stopper 14, the lens 1o itself is inserted between the elastic pieces 13, and when the return elasticity of each elastic piece 13 works, the tapered surface 12 of the lens 10 The elastic pieces 13 are in pressure contact with the maximum outer diameter part ff1x) of the lens 1o.
3, it is fixed and held in a predetermined position.

Next, it will be explained how the lens 10 is always held in the correct position by each zIK elastic piece 13 together with the 3.4m.

When attaching the lens 10, when the lens 10 is inserted between the elastic pieces 13 in the lens frame 11, the lens 10
is set with 9 positions shifted as shown in Figure 3,
Regarding the inclination, if we consider the moment F around point 9 a as a fulcrum, the force that the lens 10 receives from the elastic piece 13 when it is focused is as indicated by arrow 1.

1 is perpendicular to the surface of the elastic piece 13.

If the direction of this force is line segment a as shown in Figure 3.

1, the lens 10 is corrected in the correct orientation by this force.

However, the direction of this force is as shown in Figure 3.

If it is to the left of the line segments a and 1a, the lens 10 will be tilted further, but it can be said that it is not intentionally tilted during initial setting.

In addition, as for the deviation in the axial direction, as shown in Fig. 4,
If the position is misaligned in the axial direction, the elastic piece 13
The force exerted on is as shown by the arrow 0°0'.

Therefore, if this force is divided into an axial component and a radial component, it becomes as shown by the arrows D, D, and D' which act as forces to elastically hold the lens 10, while 1
．． l acts to move the lens 10 in the axial direction, and the lens 10 moves until it is stopped by the stopper 14.

It is obvious from the above description that the lens 10 is made up of each elastic piece 1.
In 3. The lens 10 can always be held in the originally expected correct position by the force for correcting the inclination and the force for moving the lens 10 in the axial direction and pressing it against the stopper. Compared to other devices, the misalignment can be reduced to about one-third.

Now, instead of the first embodiment of the lens holding device of the present invention, the second to 18th embodiments will be described below with reference to FIGS. 5 to 21.

The second embodiment shown in FIG.
b is bent outward to provide a guide end 15, so that the lens 10 can be mounted while being inserted from either the front or rear direction of the elastic piece 13.

In the third embodiment shown in FIG. 6, the stopper 16 is formed by the inner step of the lens frame 11, and the guide end 17 &
An elastic piece 17 is formed of metal or plastic separately from the lens frame 11, and its rear end 17m is attached to the lens frame
The stopper 16 is constructed by inserting it into the wall surface of the lens frame 11 and fixing it thereon, and the stopper 16 is constructed from the wall surface of the lens frame 11 separately from the elastic piece.

Unlike the first embodiment, the lens 10 does not deform together with the elastic piece 13, and the position of the lens 10 in the thrust direction can be expected to be accurately regulated.

In the case of the fourth embodiment of TWi, two oblique tapered surfaces 18 and 19 are provided on the outer layer in the direction of the lens 12, and an elastic piece 20 with a guide end 20 & is attached to the lens frame 11 in the same way as in the third embodiment. Attach the insert to the wall of the mirror frame 1.
A stopper 2 having a tapered surface 22 & on a stepped portion 21 of 1
2, the elastic piece 20 and the stopper 22 constitute an engaging recess that can engage the tapered surface 18, 19 of the lens 10.

One tapered surface 18 is elastically abutted on the elastic piece 20,
The other tapered surface 19 is connected to the tapered surface 2 of the stopper 22.
2 & can hold the lens 10 while abutting and locking the lens 10, and is suitable for application to a concave lens.The tapered surface of the lens 10 is made up of an elastic piece 20 and a stopper 22. The engagement recesses of 18 and 19 can further improve the centering accuracy in the lens holding state.

The fifth embodiment shown in FIG.
Instead of forming the stopper 16 integrally with the stepped portion of the wall 1, an annular stopper 23 is formed separately from the lens frame 11, and is engaged with the engagement edge 24 of the wall and is screwed into the wall. Screw the presser ring 26 onto the threaded part 25,
Fix the stopper 23 above.

In addition, the elastic piece 2T having the same configuration as the elastic piece 17 in the third embodiment is turned in the opposite direction, and the rear end 271 is
1 is inserted into a wall and fixedly attached.

The tip 27a of the elastic piece 27 presses against the tapered surface 12 provided along the outer periphery of the lens 10, and the stopper 2
The lens 10 is held within the lens frame 11 by pressing in three directions.

The sixth embodiment shown in FIG.
2 shows an example applied to a lens 10 with 8.19.
The tapered surface 18.19 of the lens 10 is connected to the tip 27m of the elastic piece 2T and the tapered surface 23& provided on the stopper 23.
The receiver will get the guarantee and it will consist of four parts.

The holding state is the same as in the fourth embodiment. Incidentally, since the configuration is based on the fifth embodiment, the same numbers as in the fifth embodiment are used for illustration.

In the seventh embodiment shown in FIG. 10, the stopper 23 in the fifth embodiment is screwed into the threaded portion 29 of the lens frame 11 by using an annular protrusion 28 that integrally projects from the wall surface of the lens frame 11. The structure of holding the lens 10 is the same as that of the fifth embodiment.

The eighth embodiment shown in FIG.
The tips 31m and 3 of the elastic pieces 31 and 32 are fixed by the presser rings 35 and 36 screwed onto the threaded parts 33 and 34 of the elastic pieces 31 and 3.
The structure of the retaining opening part 2 m is arranged so that it can elastically engage and hold the tapered surface 18,111 of the lens 10.

The ninth embodiment of the 12th to 15th is a pair of elastic pieces 31.38
By interposing a spacer 39 between the two, -
This is a holding device in which the lens 10 is provided with a tapered surface 18, 19 that slopes in two directions, and the holding opening formed by the pair of elastic pieces 37 and 38 is fixed on one side. is constituted by a tip 37& and the other by an intermediate side 38a. 41 indicates a threaded portion.

In the tenth embodiment shown in FIG. 13, the stopper of the first embodiment is constructed by four engaging parts 43 of two elastic pieces 42 and a retaining protrusion 44 protruding from the tapered surface 12 of the lens 10, so that they engage with each other. It is designed to be held by forcing it. Incidentally, it is also possible to configure the engaging recess and the protrusion in opposite directions, and such a configuration is specifically shown in the eleventh embodiment shown in FIG. 14.

In the figure, 45 is the engagement protrusion of the elastic piece 42, and 46 is the lens 10.
This is an engagement recess provided in the tapered surface 12 of the.

No. 15-18, No. 12-15.17 shown in 20.21.
18 (7) Each implementation N c, me 11 (7) Inner wall surface 1
1a and a tapered surface 12 provided on the outer periphery of the lens 10, an elastic member 47 is interposed to elastically hold the lens 10.

The 11112 actual example is one tapered surface 19 of the lens 10.
is fixed by a stopper 48, and the lens 10 is held by an elastic member 47 interposed between the other tapered surface 18 and the inner wall surface 111 of the lens frame 11. It is locked at.

In the thirteenth embodiment, the stripe bar 48 is not provided.

V-shaped tapered surfaces 1 & 19 of the lens 10 and the lens frame 11
The elastic member 4T is held by interposing the elastic member 4T between the inner wall surface 11&, and the elastic member 47 is locked by the protrusion 50 of the inner wall surface 111.

In the 14th embodiment, a lens 52 having a tapered surface 51 having an arcuate cross section is arranged according to the shape of the tapered surface 51.
The structure is such that an elastic member 4T having an elastic piece 53 that is curved is inserted and held.

The 15th embodiment is an example in which the lens 10 is held at the open end of the lens frame 11, and one tapered surface 19 of the lens 10 is fixed to the tapered surface 54 at the 80-side end, protruding from the open end. By attaching the elastic member 47 to the support arm 55, the elastic piece 56 presses and holds the other tapered surface 18.

In the 17th embodiment, one surface of the outer periphery of the lens 10 is locked to the stepped portion 57 of the frame 11, and an elastic piece 58 of the elastic member 4T interposed between the tapered surface 12 and the inner wall surface 11 of the lens frame 11 is used. While pressing the tapered surface 12, the tip 58 of the second elastic piece 5B
The protrusion 59 protruding from & is engaged with the outer peripheral edge of the lens 10 to prevent the lens 10 from moving in the axial direction.
The 18th embodiment is a support with a stopper 60 and an elastic piece 61 on the negative side, and an elastic support arm 62 on the other side.
The material 63 is placed between each of the many lenses 10 and on the inner wall surface 1i of the lens frame 11.
By interposing the lens 10 between the holes 60 and 60, each lens 10 is locked by the stopper 60, and the elastic piece 61 locks the lens 10.
While holding down the tapered surface 12 of 0 and supporting the adjacent front lens 10 with the other support arm 62, a large number of lenses 10
This is a j# configuration that holds the .

The 16th embodiment shown in FIG. 19 is an embodiment in which the lens 10 is held at the open end of a lock frame 11 by an elastic piece 64 that is integrally installed from the open end.

One tapered surface 1B of the tapered surfaces 18 and 19 inclined in two directions is held while the other tapered surface 19 is fixed to the tapered surface 65 at the opening end of the presser.

The lens holding device of the present invention has the above configuration,
It simplifies the work of attaching the lens to the lens frame, and when it is attached, it is held in place by the elasticity of the elastic part, eliminating the need for torque adjustment when tightening conventional screws. The taper of the lens elastically holds the lens through the taper, so changes in the diameter and thickness of the lens caused by temperature, humidity, and other factors are absorbed by the elasticity of the elastic part, and center misalignment is prevented. This can prevent the occurrence of tilt.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional lens holding device. m1FIJ & is a side sectional view of the first embodiment of the lens holding device of the present invention, FIG. 2 is a longitudinal sectional front view of the same, FIG. The figure is a partially omitted cross-sectional view showing the 2nd to 1B embodiments. 1.11... Lens frame 2.10, 52... Lens 3O... Step part 4... Fitting part 5... Screw part 6... Holding ring 12.1B, 19, 51... - Lens tapered surface 13, 1? , 20.27.31.32.37.38.
42.56°58, 61.64...Elastic piece 14.16, 72, 73.28.48.6fl...Stopper 15...Guy, do end 21...Step part 24...Relationship Joint edge 25, 79.33.34.41...Threaded part 26, 30
．． 35.36.40... Presser ring 39... Spacer 43, 46... Engagement recess 44.45... Engagement protrusion 47... Elastic member 49.50... Engagement protrusion 53...Elastic piece 5441...Tapered surface 55...Support arm 5T...Step part 59...Protrusion 62...Support arm 63...Support member $3W! Figure 4I4 Figure 5 Figure 6 Figure 111 Hayabusa 1BIIa Hayabusa 15 Figure 12 Figure 70 Figure 14 l116 February 17, 1980 Commissioner of the Patent Office Shima 1) Spring One of the leading cases Indication of 1986 Patent Application No. 186248 Name of the invention 2° Lens holding device 3 Relationship with the case of the person making the correction Patent applicant address 2-43-2 Hatagaya, Shibuya-ku, Tokyo Name (037) Orinno (Sumoto Gaku Kogyo Co., Ltd.) Company IRm
Column ``& President Shigeru Kitamura Brief Explanation'' and Drawing 8 Amended Uchitani (1) ◎ Self-dedication in the 11th line of the specification No. 5, line 16jJ, and the second line of 'm6Jij , rtX
Coast-C with m3J respectively as "step 6". (2) Luns of the Me ridge are fitted to each of the 12th line of the specification 4I#5, the 13th line of the concession, and the 5th line of the 6th line of Suzu.
fli4J is corrected as "lens desire 8 #D 5". (3) Akira#1lllF纂5 Taka line 13 and 7
In each of the second lines of the condolence, there is a "screw 5" written on the track, which is supplemented with "screw m4J." Correct aJ as [・screw @ 3 a J. (5) d own body in the 19th line of the 5th shell of the specification, the 1st line of the 6th shell, and the 2nd line of @7jijm. 6"t and tt and "presser foot #A3" respectively. (6) ML Soft on line 19 of Iris 21 of the specification, [3-・
...Replace RfmJ with [3...presser mass]. (7) In the 21st line of the specification, line 20, “4.
...Fitting part" is corrected to "4...Screw part." (8) Details 22) j.
・0・Threaded portion” is corrected as “51...Skewer lens fitting portion”. (9) “6...
... Correct "presser ring" to "6Φ... step part". Figure 1, 6.20 of the drawings will be retroactively corrected. 9. List of attached documents 11) Amended drawings 1 copy Figure III *6 Figure @Figure 20

Claims (9)

[Claims] (1) A lens holding device that includes a taper provided on a lens to be held, a stopper that restricts the lens to be held in the optical axis direction, and an elastic portion that presses the tapered surface of the lens to be held. (2) The lens holding device according to claim 1, wherein the stopper is formed integrally with an elastic portion. (3) An elastic section in which the stopper is integrally formed with the elastic section and includes the stopper. Claim 1XJ comprising at least three or more
Lens holding device as described. (4) The lens holding device according to claim 1, further comprising a retaining guide portion when the elastic portion engages the outer peripheral edge of the lens to be held. (5) The lens holding device according to claim 1, wherein the taper provided on the lens to be held comprises a tapered surface inclined in one direction or two directions. C (6) The taper provided on the lens to be held is composed of a tapered surface inclined in two directions, and the stopper is
The lens holding device according to claim 1, which is constituted by a pair of elastic parts that press the two tapered surfaces. (7) The debar provided on the lens to be held is composed of a tapered surface inclined in two directions, and the stopper is
The lens holding device according to claim 1, wherein the lens holding device is configured as an engaging portion or an engaged portion having a tapered surface inclined in two directions. (8) The lens holding device according to claim 1, wherein the elastic portion is integrally formed on the wall surface of the lens frame. (9) The lens holding device according to claim 1, wherein the elastic portion is attached to the St surface of the lens frame. aG The lens holding device according to claim 1, wherein the elastic portion is fixed by a presser ring screwed onto the 81 side of the lens frame. The lens holding device according to claim 1, wherein the stopper is fixed by a presser ring screwed onto the wall surface of the lens frame. a. An engaging part or an engaged part is provided on the taper of the lens to be held, and a secured part or a retaining part corresponding to the engaging part or the engaged part provided on the tapered surface is provided in the elastic part. Claim 1, wherein the lens to be held is regulated in the optical axis direction by providing and engaging the engaging portion or the engaged portion of the tapered surface and the elastic portion with each other. Lens holding device 1゜ ■ The above elastic part is formed separately from the lens frame, and the tapered surface of the lens to be held and the inner part of the lens frame are
! The lens holding device according to claim 1, which is elastically mounted between the surfaces. A4. The lens holding device according to claim 1, wherein the taper of the lens to be held is formed by a recess having an arcuate cross section, and an elastic portion is elastically mounted between the recess and the inner wall surface of the lens frame. a! 9. The lens holding device according to claim 1, which is arranged at the end of the elastic lens frame. The lens holding device according to claim 1, wherein the elastic fixing portion at the end of the lens frame is arranged on the outer periphery or the inner and outer peripheries of the lens frame. Q'/l The above-mentioned elastic part is constituted by an elastic topper, and the elastic part provided with this stopper is constituted by a support body having a stopper and an elastic taper on the - side and an elastic arm on the other side. A lens holding device according to claim 1, which holds a set number of lenses to be held by interposing a support between the tapered surface of the lenses to be held and the wall surface of the lens frame.