JP2002303776A - Focus adjusting device for optical equipment, camera incorporating the same, and camera manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focus adjusting device for optical equipment which facilitates focus adjustment by making it easy to adjust a lens position when the camera is assembled, the camera which incorporates the adjusting device, and a camera manufacturing method. SOLUTION: The camera 10 has a lens frame unit 14 which holds a lens, a focus ring 16 which is provided abutting against the subject side of the lens frame unit 14 and varies in optical-axis directional thickness in the circumferential direction, and a main frame 20 which supports the focus ring 16. When components are assembled to manufacture this camera 10, the focus ring 16 is provided rotatably on the lens optical axis. The focus ring 16 is supported by the main frame 20, so the lens frame unit 14 moves to and away from a film surface F through the rotation of the focus ring 16. Consequently, the distance between the film surface F and the lens is adjusted to put the shift of the lens focus position from the film surface within a permissible range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focus adjusting device for an optical apparatus which can easily adjust a lens position and assemble the same, a camera incorporating the same, and a camera manufacturing method.

[0002]

2. Description of the Related Art When manufacturing a camera by assembling camera parts, when a manufacturing error of a lens or a mechanical part affects image quality performance, particularly, in order to match a focus position at a predetermined subject distance with a film surface, It is necessary to adjust and fix the lens position.

[0003] For example, as shown in FIG.
Frame unit 84 and main frame 86 for fixing
And one or more washers 88 are interposed between them, and the distance between the lens 82 and the film surface F is adjusted so that the focal point is located on the film surface (the number of lenses is plural. Although only one is shown in FIG. 33 for simplicity).

As another method of adjustment, as shown in FIG. 34, a lens holder 90 for holding a lens 82 is manufactured, and a male screw is formed on the outer periphery of the lens holder 90. Then, a female screw is formed in the holder holding portion 94S of the lens holder unit 94 for fixing the lens holder 90, and the lens holder 90 is screw-engaged with the holder holding portion 94S so that the focal point is located on the film surface F. Then, the lens holder 90 is rotated and adjusted, and in the adjusted state, the lens holder 90 is fixed to the holder holding portion 94S with an adhesive or the like.

Regardless of the method of adjustment, it is necessary to make adjustments so that the amount of shift of the focal position from the film surface is within an allowable range.

However, these adjustment methods have the following problems. For example, in the adjustment in which the washer 88 is interposed, the washer 88 needs to be attached at a plurality of locations, and when the adjustment amount changes, it is necessary to select the thickness and the number of sheets in accordance with the adjustment amount. Cheap. In the adjustment using the lens holder 90, 1
Each product had to be set on the adjuster and adjusted and fixed by bonding, etc., which required a great deal of time for the adjustment work.

[0007] An example of a conventional camera is disclosed in JP-A-10-39385. FIG. 35 (Japanese Unexamined Patent Application Publication
As shown in FIG.
The light shielding tube 127 and the lens barrel unit 128 of the camera body 123
Cam surface 1 spirally inclined along the photographing optical axis
The cam ring 129 on which the cam 71 is formed is rotatably sandwiched.
36b is in contact. Then, by rotating the cam ring 129, the lens barrel unit 128 is moved along the photographing optical axis to perform focus adjustment.

[0008] However, NEAR, IN
It is desired from the viewpoint of improving productivity that focus adjustment with F or the like can be easily performed in lot units.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described circumstances, and has been made in consideration of the above-described facts. It is an object to provide a method.

[0010]

According to the first aspect of the present invention, there is provided a lens holding member for holding a lens, and a contact member for contacting the lens holding member in the optical axis direction of the lens. The contact portion between the contact member and the lens holder has a step-shaped step formed on one side, and a protrusion that contacts the step formed on the other side. .

In many cases, frames are provided before and after the contact member and the lens holder. When adjusting the contact position of the protrusion, at least one of the contact member and the lens holder is moved (for example, rotationally moved) to be adjusted. By adjusting the contact position of the protrusion in this way, the focal position of the lens can be easily adjusted in lot units.

According to a second aspect of the present invention, the contact body is a ring body whose thickness in the optical axis direction changes in the circumferential direction.

By rotating the ring body whose thickness in the optical axis direction changes in the circumferential direction around the optical axis of the lens, the lens holder advances and retreats with respect to the film. The step per step of the step portion is determined by the required focus accuracy according to the camera specifications and the like.

Thus, the distance between the film and the lens is adjusted so that the focal point of the lens can be shifted from the film surface within an allowable range, and the ring body can be easily manufactured. Adjustment of the distance between the lens and the lens becomes easy.

According to a third aspect of the present invention, an urging means for urging the lens holder toward the ring body is provided.

As a result, the adjusting mechanism is simplified, and the play between the lens holder and the mechanical body can be eliminated.

According to a fourth aspect of the present invention, a step surface for an INF setting distance and a step surface for a pair of NEAR setting distances are alternately formed on each step surface side of the step portion. And

Thus, even in the case of a two-point auto-focus type camera, the focus position can be easily adjusted when assembling parts.

In the invention described in claim 5, one of the contact portions between the ring body and the frame is provided with a second step portion having a height difference per step larger than that of the step portion.
On the other side, a projection is formed to contact the second step.

Since the frame supports the ring body, the ring body moves forward and backward with respect to the frame by rotating the ring body. Since the height difference per one step of the second step portion is larger than the step difference between the step portion and the adjacent INF surface described in claim 3, this forward and backward movement of the ring body with respect to the frame is caused by claim 3 or The forward and backward movement of the step is larger than that of the invention described in claim 4.

Therefore, according to the fifth aspect of the present invention, the adjustable range of the focal position can be greatly widened.

According to the invention described in claim 6, a guide rod provided along the optical axis of the lens, and a restriction guided by the guide rod to limit the rotation of the lens frame unit around the optical axis. And a unit are provided.

Thus, the contact protrusion can be provided at one place, and the adjustment range of the focal position can be widened with a simple configuration.

According to the present invention, a lens holder for holding a lens, a ring member provided in contact with the lens holder and having a thickness in the optical axis direction changing in a circumferential direction, and A focus adjusting device for an optical device having a ring body and frames provided before and after the lens holder is built in.

Since the frame is disposed before and after the ring body and the lens holder, the rotation of the ring body whose thickness in the optical axis direction changes in the circumferential direction causes the lens holder to advance and retreat with respect to the film. Move. This realizes a camera in which the distance between the film and the lens is adjusted during manufacturing, and the shift of the focal point of the lens from the film surface is within an allowable range.

According to an eighth aspect of the present invention, there is provided a camera manufacturing method for manufacturing by adjusting a focal position of a lens, wherein the lens body and the ring body whose thickness in the optical axis direction changes in the circumferential direction are held. A lens holder is provided between a frame provided in the front part of the camera and a frame provided a little more on the film surface side, and the focal position of the lens is adjusted by rotating the ring body. The focus position can be adjusted by selecting the rotational position of the ring body.

Thus, when assembling parts and manufacturing a camera, the time required to adjust the focal position can be greatly reduced, and this adjustment can be easily performed.

[0028]

Embodiments of the present invention will be described below with reference to embodiments.

[First Embodiment] As shown in FIGS. 1 to 4, the camera 10 according to the first embodiment is a two-point autofocus (hereinafter, referred to as two-point AF) type camera.

On the subject side (front side of the camera) of the lens frame unit 14, a focus ring 16 for adjusting the distance between the lens 12 and the film surface F, and a main frame 20 for supporting the focus ring 16 from the subject side are sequentially provided. Have been. The focus ring 16 is rotatable around the optical axis of the lens.

A shutter base 22, a shutter blade 24, and a shutter plate 26 are sequentially provided on the rear side of the camera of the lens frame unit 14, and a housing of the camera 10 is formed on the rear side of the shutter plate 26. A camera body 30 is provided. Shutter base 2
2 is provided with a compression coil spring 32 for urging the lens frame unit 14 toward the focus ring 16.

A gear is formed on the outer periphery of the focus ring 16, and the focus ring 16 is rotatable by a focus ring drive unit 36. The distance to the subject is measured by a distance measuring device provided on the camera side. Measure the distance,
When it is determined that the point is farther than the predetermined distance, the rotation is not performed, and when it is determined that the point is near, it is rotated by the predetermined angle.

By the rotation of the focus ring 16,
The distance between the focal position of the lens 12 and the film surface F is corrected by a predetermined amount, and when the subject distance is close, focus is achieved.

FIG. 5 shows a case where the adjustment amount of the focal position is set to a high accuracy of 0.05 mm per step and a wide adjustable range of 15 steps is realized by the present invention. This allows
The displacement of the focal position due to a manufacturing error between the lens and the mechanical component can be covered over a wide range of ± 0.35 mm. Less than,
This will be sequentially described in detail.

[Adjustment of Focus Position by First Cam] As shown in FIG. 6, irregularities are formed on the inner edge of the film side of the focus ring 16 (the side of the lens frame unit 14) (hereinafter referred to as focus ring). The projections and depressions (cam followers) 14A to 14C (see FIG. 9) formed on the rear side of the camera of the lens frame unit 14 are applied to the first cam 40. Touch As shown in FIG. 7, the first cam 40 has the same shape in three regions 40A to 40C divided at every 120 °.

As shown in FIG. 8, in the areas 40A to 40C,
A convex portion used for adjusting the focal position at the INF set distance and a concave portion for the focal position at the pair of NEAR set distances are alternately formed, and the heights thereof are INF,
Both NEARs are changing stepwise. In each region, the height difference Δh1 between the adjacent convex portion and concave portion is INF and N
The lens extension required to switch the EAR, here 0.3
mm. Δh1 is constant at each adjustment point. The height difference Δh2 between adjacent convex portions across the concave portion is 0.0
5 mm. Naturally, the difference in height between the concave portions adjacent to each other with the convex portion therebetween is also Δh2 (0.05 mm). The first cam 40
The contact surfaces of the convex portions and the concave portions (the surfaces with which the convex portions 14A to 14C of the lens frame unit 14 abut) are all flat surfaces.

Here, the focus position can be adjusted in five steps for the adjustment at the INF position by rotating the focus ring 16. Since the number of steps is limited by the positional accuracy of the focus ring 16 and the angle of the inclined portion of the first cam 40, it cannot be set unnecessarily.
Also, irregularities of the same shape are formed every 120 °.

The height difference Δh2 is the accuracy of adjusting the focal position, and the finer the difference, the higher the accuracy. However, it is meaningless, and if it is too large, the image quality also deteriorates. Therefore, the appropriate value is
It is determined based on the above-mentioned matters and the specifications of the camera. In addition,
Here, it is 0.05 mm.

[Adjustment of Focus Position over 15 Steps Using First and Second Cams] As shown in FIG.
Irregularities are also formed on the object side of the focus ring 16 (hereinafter, these irregularities formed on the object side of the focus ring 16 are referred to as second cams 44). As shown in FIG. Projections (cam followers) 20D to 20F formed on the film side of the main frame 20 abut. By rotating the focus ring 16,
The focus position can be adjusted in three steps (see FIG. 8).
), The focal position of the INF can be adjusted in 15 steps by a synergistic effect with the adjustment in 5 steps by the first cam 40.

As shown in FIGS. 9 and 14, the second cam 44
Are divided into three regions 44D to 44F every 120 °.

In each area, the innermost, outermost, and
The projections and depressions are formed in three parts, a central part between the outermost part and the innermost part.

In the region 44D, the innermost protrusion 44DP
Are formed, the central part is a flat part 44DF, and the concave part 44DH is formed at the outermost part. In the region 44E, the innermost part is the flat part 44EF, and the central part is the concave part 44EH.
Is formed, and a convex portion 44EP is formed on the outermost part. In the region 44F, a concave portion 44FH is formed in the innermost portion, a convex portion 44FP is formed in the central portion, and a flat portion 44FF is formed in the outermost portion. As shown in FIG.
When the height position of F, 44EF, 44FF is set to 0, the flat portions 44DF, 44EF, 44FF and the convex portions 44DP,
The height difference Δh3 between 4EP and 44FP is 0.25 mm, and the flat portions 44DF, 44EF and 44FF and the concave portion 44D
H, 44EH, and 44FH also have a height difference of Δh3.
(0.25 mm). The surfaces of the convex, flat, and concave portions are all flat.

The protrusions 20D to 20F of the main frame 20 are 1
The focal position can be adjusted in three stages by making the projection abut on the second cam 44 every 20 °. More specifically, with reference to the drawings, the three protrusions 20D to 20F of the main frame 20 are three protrusions 44EP, 44FP, and 44 constituting the second cam 44 in FIG.
DP respectively, and in FIG.
F, 44DF, and 44EF, respectively.
In No. 4, they are in contact with the concave portions 44DH, 44EH, and 44FH, respectively. That is, normally, the first cam 40 alone is 1
Although there is an adjustment range only in the range of 20 °, by installing the second cam 44, an adjustment range of up to 360 ° can be obtained.

As shown in FIG. 14 and the like, numerals 1 to 15 are stamped on the object side of the focus ring 16, and mark marks M are formed outside each numeral.
As shown in FIG. 13, the mark M is assembled in accordance with the position of a mark M ′ formed on a gear portion 36 </ b> G of the focus ring drive section 36, which will be described later. The number indicates the adjustment state number. For example, in FIGS. 1 is set. In FIG. 8, each adjustment N
o. In the state adjusted in the above, the projections 14A to 14C of the lens frame unit 14 are adjusted to the projections for INF with which the projections 14A to 14C abut.
o. Is attached.

[AF operation mechanism of focus ring] FIG. 1
As shown in FIG. 0, the focus ring driving unit 36 is a gear unit 3 that meshes with a gear formed on the focus ring 16.
6G, an INF-side stopper 36J and a NEAR-side stopper 36K for stopping rotation of the gear 36G, and a gear 3
6G and a focus lever 36L (see FIGS. 10 to 12) that penetrates through the main frame 20 and transmits a rotational power to the gear portion 36G.

As shown in FIG. 12, an engaging portion having a concave portion 36H for engaging with an end of a focus lever 36L is provided at the tip of a retractable iron core 36S constituting a plunger 36P of the focus ring driving portion 36. A plunger 36P is provided on the plunger 36P.
Compression coil spring 36 that urges S in a direction to return to the original position
R is attached.

When it is determined that the subject distance is short, the coil of the plunger 36P is energized, and the focus lever 36L and the gear portion 36G are rotated by the retracting operation of the iron core 36S. As a result, the focus ring drive unit 36 rotates in the NEAR direction and stops at the NEAR-side stopper 36K. At the same time, the turning position of the focus ring 16 is switched to the NEAR position.

After the rotation position is adjusted, the focus ring 16 is disabled from rotation in order to prevent the focus position from moving. Thereafter, the operation proceeds to the shutter driving operation while maintaining this state, and the photographing is completed. Next, when energization of the coil of the plunger 36P is stopped, the compression coil spring 3
By the action of 6R, the focus ring 16 returns to the original INF position. If the subject distance is a distant point, the operation immediately proceeds to the shutter driving operation without energizing the plunger 36P.

[Specific Example of Focus Position Adjustment] As shown in FIG. 14, when the mark M near the numeral 1 stamped on the object side of the focus ring 16 has reached the position of the mark M '. And the camera 10 is adjusted N for the INF.
o. The state has been adjusted to 1. In this state, each of the projections 14A to 14C of the lens frame unit 14 is in contact with the projection having the highest height among the projections of the first cam 40 (see FIGS. 8 and 15).

FIG. 8 shows the position of the cam follower. In this figure, the convex portions 20D to 20F of the main frame 20 abut on the flat portion of the second cam 44, and
The projections 14A to 14C of the lens frame unit 14 are in contact with the projections of the third stage among the projections of the five stages of the first cam 40. Assuming that this state is the reference position, the adjustment No. In the state of No. 1, the position is indicated by a dotted line in the figure, and the first cam 40 causes the lens frame unit 14 to move in two steps (0.
05 mm × 2 = 0.1 mm), and at the same time, the second cam surface moves from the flat portions 44DF to 44FF to the convex portions 44DP to
44FP, the focus ring 16 and the lens frame unit 14 are connected to each other by Δh3 =
Pushed up by 0.25 mm. So in total-
The lens frame unit 14 is adjusted in the optical axis direction by 0.1-0.25 = -0.35 mm.

By the same adjustment, the INF is adjusted to the adjustment No. 5 (see FIG. 18 and FIG. 19), 6 (see FIGS. 20 and 21),
Adjustment No. 10 (see FIGS. 22 and 23), the adjustment No. 11 (FIGS. 24 and 2)
5), Adjustment No. 15 (FIG. 26,
27 (see FIG. 27). That is, the adjustment No. 1
For 15, the focus position of the INF set distance can be similarly adjusted.

In this way, as shown in the movement amount indications U to W shown in FIG. 8, the INF is set to a value within the range of -0.35 mm to +0.35 mm from the reference position.
It is possible to move the focal position every 5 mm.

As described above, according to the first embodiment, 2
When assembling the point AF type camera 10, the operator adjusts the determined adjustment No. The focus position can be adjusted by easily changing the position of the lens 12 with respect to the film surface F simply by assembling the gear with the gear engagement positions of the focus ring 16 and the focus lever 36.
The time required for adjusting the focal position at the time of assembling 0 can be greatly reduced.

The above adjustment No. Regarding the determination, if it is considered that the manufacturing error of the lens and the mechanical parts is stable within one lot, it may be determined based on the focus data of several units at the start of the lot introduction, and the same work may be performed on a daily basis. May go. Furthermore, it is also possible to set the adjustment for each unit and adjust it.

[Second Embodiment] As shown in FIG. 28, the camera 50 according to the second embodiment has a camera 50 along the optical axis direction of the lens.
A guide rod 54 (hereinafter simply referred to as a guide rod 54) and a lens frame unit 55 for holding a lens;
The lens frame unit 55 has legs 55L guided by the guide rods 54, respectively. The guide rod 54 is provided in parallel with the optical axis of the lens.

The camera 50 includes a lens frame unit 55
And a focus ring 52 which is in contact with the first cam 4 on the back side, which is the same as that of the first embodiment.
Has zero. On the back side of the main frame 57 that supports the focus ring 52, a cylindrical portion 57T that guides the focus ring 52 to be easily rotated is provided.

The guide rod 54 is provided with a compression coil spring 59 interposed between the shutter base 58 and the leg 55L.
Are constantly being pushed towards.

This prevents the lens frame unit 55 from rotating around an axis other than the lens optical axis.
Therefore, even if only one convex portion (cam follower) 55P that contacts the first cam 40 is formed on the leg portion 55L, the focal position of the lens can be sufficiently adjusted by adjusting the rotational position of the focus ring 52. be able to.

Note that the focus ring 52 does not have the second cam as described in the first embodiment, and has a simple structure.

[Third Embodiment] As shown in FIG. 29, the camera 66 according to the third embodiment is different from the first embodiment in that the second cam is not formed on the focus ring 70, as shown in FIG. The main frame 72 is not formed with a convex portion that contacts the second cam. Therefore, the focus position of the INF is adjusted only by the first cam 74 of the focus ring 70 (unevenness of the focus ring 70 on the film side).

As a result, the adjustable range of the focal position is narrower than in the first embodiment, but the configuration can be simplified.

[Fourth Embodiment] As shown in FIG. 31, a camera 76 according to a fourth embodiment is not a two-point camera but a pan-focus camera. In the fourth embodiment, two surfaces for INF and NEAR are not required, and only one surface to follow in the whole area is sufficient.
The shape of the first cam 80 (the unevenness of the focus ring 78 on the film side) formed on the first cam 80 is the first cam 80 described in the third embodiment.
It is simpler than the cam 74 (see FIG. 30) (FIG. 32).
See also).

After the rotational position of the focus ring 78 is adjusted, a rotation restricting portion 77S meshing with a gear formed on the outer periphery of the focus ring 78 is provided on the main frame so that the focus ring 78 is fixed at the adjusted position. 77.

According to the fourth embodiment, the configuration can be greatly simplified.

[0065]

According to the present invention having the above-described configuration, the following effects can be obtained.

According to the first aspect of the present invention, the focal position of the lens can be easily adjusted in lot units.

According to the second aspect of the present invention, by rotating the ring body, the distance between the film surface and the lens is adjusted, and the deviation of the lens focal position from the film surface is within an allowable range. And the ring body is easy to manufacture, and the distance between the film surface and the lens is easily adjusted.

According to the third aspect of the present invention, the adjusting mechanism is simplified, and the play between the lens holder and the mechanical body can be eliminated.

According to the fourth aspect of the present invention, even with a two-point autofocus type camera, the focal position can be easily adjusted at the time of assembling parts.

According to the fifth aspect of the present invention, the adjustable range of the focal position can be greatly widened.

According to the sixth aspect of the present invention, the contact protrusion can be provided at one place, and the adjustment range of the focal position can be widened with a simple configuration.

According to the seventh aspect of the present invention, a camera is realized in which the distance between the film and the lens is adjusted at the time of manufacturing, and the deviation of the focal point of the lens from the film surface is within an allowable range. Is done.

According to the eighth aspect of the present invention, when manufacturing a camera by assembling parts, the time required for adjusting the focal position can be greatly reduced, and this adjustment can be easily performed. it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing components of a camera according to a first embodiment before focusing on a film.

FIG. 2 is a developed perspective view showing components of the camera of the first embodiment until the film is focused.

FIG. 3 is a perspective view showing a state where the components shown in FIG. 2 are assembled.

FIG. 4 is an enlarged sectional view of FIG. 3;

FIG. 5 is a side view showing an adjustment range of a focal length. The unit of the numerical value indicating the distance is mm, and the numbers 1 to 15 indicating the positions indicate the adjustment numbers.

FIG. 6 is a partially enlarged view of FIG. 1;

FIG. 7 is a perspective view of a focus ring of the camera of the first embodiment.

FIG. 8 shows a first embodiment in which the distance between the lens and the film is 15;
FIG. 9 is a schematic diagram showing that adjustment can be performed in stages, and a solid line indicates an adjustment No .; 8, the dashed line indicates the adjustment No. 1 is shown. The lens movement amount is shown below each adjustment number.

FIG. 9 is a partially enlarged view of FIG. 2;

FIG. 10 is a perspective view showing a focus ring rotating mechanism.

FIG. 11 is a rear view showing a rotation mechanism of a focus ring.

FIG. 12 is a partial cross-sectional view illustrating a configuration of a focus ring driving unit that rotates a focus ring.

FIG. 13 is a front view showing an adjustment state by a focus ring (a state in which a main frame is provided).

FIG. 14 is a front view showing an adjustment state by a focus ring (a state in which a main frame is not provided).

FIG. 15 is a front view showing a contact position of a convex portion of the lens frame unit with a first cam in the adjustment state shown in FIG. 14;
I indicates a region (convex portion) used for INF, and N indicates a region (concave portion) used for NEAR.

FIG. 16 is a front view showing an adjustment state by a focus ring.

FIG. 17 is a front view showing a contact position of a convex portion of the lens frame unit with a first cam in the adjustment state shown in FIG. 16;
I indicates a region (convex portion) used for INF, and N indicates a region (concave portion) used for NEAR.

FIG. 18 is a front view showing an adjustment state by a focus ring.

FIG. 19 is a front view showing a contact position of the convex portion of the lens frame unit with the first cam in the adjustment state shown in FIG. 18;

FIG. 20 is a front view showing an adjustment state by a focus ring.

21 is a front view showing a position where the convex portion of the lens frame unit contacts the first cam in the adjustment state shown in FIG. 20;

FIG. 22 is a front view showing an adjustment state by a focus ring.

FIG. 23 is a front view showing a position where the convex portion of the lens frame unit contacts the first cam in the adjustment state shown in FIG. 22;

FIG. 24 is a front view showing an adjustment state by a focus ring.

FIG. 25 is a front view showing a contact position of the convex portion of the lens frame unit with the first cam in the adjustment state shown in FIG. 24;

FIG. 26 is a front view showing an adjustment state by a focus ring.

FIG. 27 is a front view showing a position where the convex portion of the lens frame unit contacts the first cam in the adjustment state shown in FIG. 26;

FIG. 28 is a partially developed perspective view of the camera of the second embodiment.

FIG. 29 is a partially developed perspective view of the camera of the third embodiment.

FIG. 30 is a partially developed perspective view of a camera according to a third embodiment.

FIG. 31 is a partially developed perspective view of a camera according to a fourth embodiment.

FIG. 32 is a view showing a fourth embodiment in which the distance between the lens and the film is 5;
It is a conceptual diagram of the 1st cam which shows that it can adjust over a stage.

FIG. 33 is a partial side sectional view of a conventional camera.

FIG. 34 is a partial side sectional view of a conventional camera.

FIG. 35 is a partially developed perspective view of a conventional camera.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Camera 12 Lens 14 Lens frame unit (lens holder) 14A-C Convex part (projection) 16 Focus ring (ring body) 20 Main frame (frame) 20D-F Convex part (projection) 32 Compression coil spring (biasing) Means) 40 First cam (step portion, step surface) 44 Second cam (second step portion) 50 Camera 52 Focus ring 54 Guide rod 55 Lens frame unit 55L Leg (restriction) 55P Convex (projection) 57 Main frame (frame) 66 Camera 70 Focus ring 72 Main frame (frame) 74 First cam (step) 76 Camera 77 Main frame (frame) 80 First cam (step) 82 Lens 84 Lens frame unit (lens holder) ) 86 Main frame (frame) 90 Lens holder (lens holder) 29 cam ring (ring body) 136 b protruding pieces (projection)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 9/10 G03B 17/02 17/02 G02B 7/04 DEF term (Reference) 2H044 AE01 AJ06 BD01 BF01 BF07 DA01 DB00 2H081 AA41 AA48 EE04 2H100 BB02

Claims (8)

[Claims] 1. A lens holder that holds a lens, and a contact body that comes into contact with the lens holder in an optical axis direction of the lens, wherein a contact portion between the contact body and the lens holder. Is a focus adjusting device for an optical device, characterized in that a step-shaped step portion is formed on one side, and a protrusion contacting the step section is formed on the other side. 2. The focus adjustment device for an optical device according to claim 1, wherein the contact body is a ring body whose thickness in the optical axis direction changes in a circumferential direction. 3. The focus adjusting device for an optical device according to claim 2, further comprising: an urging unit for urging the lens holder toward the ring body. 4. A step surface for an INF setting distance and a step surface for a NEAR setting distance are alternately formed on each step surface side of the step portion. The focus adjustment device for an optical device according to any one of the preceding claims. 5. A contact portion between the ring body and the frame is provided with a second step portion having a height difference per step larger than that of the step portion on one side, and the second step portion on the other side. The focus adjustment device for an optical device according to any one of claims 1 to 4, wherein a protrusion that contacts the step portion is formed. 6. A guide bar provided along an optical axis of the lens, and a restricting portion guided by the guide bar to limit rotation of the lens frame unit around the optical axis. The focus adjustment device for an optical device according to any one of claims 1 to 5, wherein 7. A lens holder for holding a lens, a ring body provided in contact with the lens holder, and having a thickness in the optical axis direction changing in a circumferential direction, the ring body and the lens holder. And a frame disposed before and after the camera. 8. A camera manufacturing method for manufacturing by adjusting a focal position of a lens, comprising: a ring body having a circumferentially varying thickness in an optical axis direction; and a lens holding body for holding the lens. The focal position of the lens can be adjusted by rotating the ring body, provided between a frame provided on the front part of the camera and a frame provided on the film surface side thereof. A camera manufacturing method, wherein a focus position can be adjusted by selecting a rotation position.