JP2001100083A - Lens moving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To move two lenses along their optical axes so that the optical axis is not tilted. SOLUTION: A zoom lens 10 comprises a 1st lens cylinder 13, a 2nd lens cylinder 14, a moving cylinder 15, a fixed cylinder 16, and a rotary cylinder 17. The 2nd lens cylinder 14 is moved along the optical axis by the displacement of a 2nd lens cam 21 provided on the rotary cylinder 17. The 1st lens cylinder 13 is moved along the optical axis by the displacement of a moving cylinder can 24 provided to the fixed cylinder 16 and a 1st lens cam 26 provided on the moving cylinder 15. The 2nd lens barrel 14 has two arm parts 38 protruding to the 1st lens cylinder 13. The arm parts 38 have their tip spread out radially. The arm parts 38 are provided with rectilinear guide projections 30 which stop the 1st lens cylinder 13 from rotating. The rectilinear guide projections 30 energize the 1st lens cylinder 13 radially to prevent the optical axis of a 1st lens 11 from tilting to a 2nd lens 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens moving device used for a photographic camera, an electronic still camera, and the like.
More specifically, the present invention relates to a lens moving device for moving a lens in the optical axis direction without tilting.

[0002]

2. Description of the Related Art Heretofore, a cam mechanism has been known as a guide means for moving a lens barrel in an optical axis direction. The cam mechanism is
It is composed of a cam follower provided in the lens barrel, a cam provided in a lens barrel which rotates relatively to the lens barrel, and a linear guide member for stopping rotation of the lens barrel. The cam follower is engaged with the cam. The lens barrel moves linearly in the optical axis direction by a displacement along the optical axis direction of the cam due to the rotation of the lens barrel. At this time, the cam and the cam follower are moved so that the lens barrel does not move while tilting with respect to the optical axis.
It is provided at each of three divided positions around the optical axis.

In such a cam mechanism, only one of the opposing wall surfaces constituting the cam is moved in the extending direction in which the lens barrel is extended toward the object side and in the extending direction in which the lens cylinder is extended toward the image forming surface side due to factors of forming accuracy. There is a problem that the stop position is shifted between the feeding direction and the feeding direction due to the backlash due to the one-side contact state in contact with the cam follower. In addition, since there are three cams and cam followers around the optical axis, if the amount of play is different in each, the lens barrel may be inclined and move with respect to the optical axis.

In order to eliminate such inconvenience, in a two-unit zoom lens barrel described in Japanese Patent Application Laid-Open No. Hei 10-123403, a spring is applied to a rear lens barrel, and the rear lens barrel is moved by the spring to the optical axis. The cam follower is always pressed against one of the opposing wall surfaces of the cam by biasing in one of the directions to prevent backlash, and a plurality of springs are hung at three divided positions around the optical axis to provide a lens barrel. It also prevents tilting while moving.

When two lenses are moved in the optical axis direction using a cam mechanism, for example, it is necessary to move the two lens barrels without backlash and without tilt. For this reason, a method of applying a spring to each lens tube, a method of interposing a spring between the lens tubes, and the like have been performed.

[0006]

However, although the backlash and the inclination can be corrected for each lens barrel by either method, there is no correlation between the backlash and the inclination correction in both of them.
There is a possibility that the optical axis of the other lens is inclined with respect to the optical axis of the other lens. If such an inconvenience occurs, an inconvenience such as an image blur that the image appears to fluctuate during zooming occurs. In addition, since a spring is used, the number of parts is increased and the cost is increased. In addition, the work for attaching the spring is required, and the work cost is increased. Further, the spring has a characteristic that the biasing force varies depending on the compression or tension length. For this reason, since the force for preventing backlash and tilt varies depending on the movement position of the lens barrel, the load generated for the movement of the lens barrel varies, and the lens barrel may not move smoothly.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and provides a lens moving apparatus which can prevent image blur during zooming, and can move the lens barrel smoothly with a constant operating load. The purpose is to provide at low cost.

[0008]

In order to achieve the above object, in the lens moving device according to the first aspect, a pressing member which engages with the first lens barrel and presses the first lens barrel in the radial direction is provided. It is provided on a two-lens tube. Further, in the lens moving device according to the second aspect, the rectilinear guide protrusion that engages with the first lens barrel so as to be able to advance and retreat in the optical axis direction and stops the rotation of the first lens barrel about the optical axis is defined as a pressing member. It was done.

In the lens moving device according to the third aspect, the first
The surface of the linear guide projection that presses the bottom surface of the linear guide groove provided in the lens barrel is formed in a spherical shape. Further, in the lens moving device according to the fourth aspect, the second lens barrel, which is relatively moved in the optical axis direction with respect to the first lens barrel, is moved in one of the optical axis directions by the urging member during the movement. It is designed to be biased in the direction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a zoom lens 10 includes a first lens 11, a second lens 12, a first lens barrel 13, a second lens barrel 14, a movable barrel 15, a fixed barrel 16,
And a rotary cylinder 17. A gear portion 18 is formed on the outer periphery of the rotary cylinder 17. The drive of the zoom motor 19 is transmitted to the gear unit 18. The rotation cylinder 17 is rotated while being in contact with the outer periphery of the fixed cylinder 16 by the drive of the zoom motor 19 being transmitted.

The zoom lens 10 shown in FIG. 2 is rotated by rotating the rotary cylinder 17 in a storage rotation range from an initial position to an intermediate position.
3 is changed from the collapsed position to the telephoto position shown in FIG. 3, and the rotary cylinder 17 is rotated in the variable magnification rotation range from the intermediate position to the end position to change the telescopic position to the wide position shown in FIG. 4. Be changed. In the retracted position, the first and second lenses 11 and 12 are moved to the storage positions closest to the image plane side while approaching each other.

A second lens barrel 1 is provided on the inner peripheral surface of the rotary barrel 17.
A second lens cam unit 21 for moving the lens 2 in the direction of the optical axis 20 and a moving cylinder straight guide groove 22 are formed. The moving cylinder straight guide groove 22 not only provides the moving cylinder 15 with rotation but also allows the moving cylinder 15 to move in the direction of the optical axis 20.

The inner peripheral surface of the fixed barrel 16 has the second lens barrel 1
A second lens straight guide opening 23 for guiding the lens 4 in the direction of the optical axis 20 and a movable barrel cam 24 for moving the movable barrel 15 in the direction of the optical axis 20 are respectively formed. I have.

The movable cylinder 15 is provided with a movable cylinder cam follower 25 on the outer peripheral surface. Moving cylinder cam follower 25
Engages with the moving cylinder cam 24 and the moving cylinder straight guide groove 22. The movable barrel 15 moves in the direction of the optical axis 20 with respect to the fixed barrel 16 while rotating in conjunction with the rotation of the rotary barrel 17. A first lens cam 26 is provided on the inner peripheral surface of the movable barrel 15. The moving cylinder cam 24, the moving cylinder linear guide groove 22, and the moving cylinder cam follower 25
Are provided at three divided positions around the optical axis 20, respectively.

The first lens barrel 13 has a first lens 11 held therein. Also, the first lens barrel 13 has
A rectilinear guide groove 27 is formed on the inner peripheral surface, and a first lens cam follower 28 is engaged on the outer peripheral surface with the first lens cam 26.
Are provided respectively. The first lens barrel 13 moves the optical axis 20 with respect to the movable barrel 15 by the action of the linear movement guide by the second lens barrel 14 and the action of the first lens cam 26 of the movable barrel 15 when the movable barrel 15 rotates. Move straight in the direction. The first lens cam follower 28 and the first lens cam 26 are provided at three divided positions around the optical axis 20.

The second lens barrel 14 has the second lens 1 therein.
I have two. On the outer peripheral surface of the second lens barrel 14, a second
The lens cam follower unit 29 and the first lens barrel 1
3 and a rectilinear guide projection 30 that engages with the rectilinear guide groove 27. The second lens cam follower unit 29 and the second lens cam unit 21
It engages with the lens straight guide opening 23. The second lens barrel 14 moves linearly in the direction of the optical axis 20 with respect to the fixed barrel 16 due to the rotation of the rotary barrel 17.

A spring is hung between the second lens barrel and the fixed barrel 16. The spring 37 urges the second lens barrel 14 toward the image plane in the direction of the optical axis 20. The second lens cam follower unit 29, the second lens cam unit 21, the second lens straight guide opening 2
The spring 3 and the spring 37 are provided at three divided positions around the optical axis 20.

More specifically, as shown in FIGS.
The lens barrel 14 supports the second lens frame 33 movably in the direction of the optical axis 20 by a feed screw 31 and a guide rod 32. The second lens frame 33 holds the second lens 12 and follows the lead of the feed screw 31 that is rotated by the driving of the focusing motor 34 so that the optical axis 2 is focused during focusing.
It is moved in the direction of 0. This movement is performed by the second lens barrel 14.
Is moved between the original position closest to the image plane and the position farther away from the object side. Second lens frame 3
Numeral 3 is the origin position at the time of zooming. Note that reference numeral 10
“a” indicates an image forming plane of the zoom lens device 10.

At the front end of the second lens barrel 14, an arm 38 is provided integrally. The arm part 38 is provided in the second lens barrel 14.
Are provided at two different positions on the outer circumference of the camera. These arms 38 have a narrow width and extend toward the subject from the front end of the second lens barrel 14. The lens barrel of the second lens barrel 14 is formed by a mold using an elastic material such as a plastic material. Therefore, each arm 38
Is in a state in which the front end on the object side spreads outward in the radial direction.

Each arm 38 has a linear guide projection 30 formed on the outer periphery on the distal end side. As shown in FIG. 5, these rectilinear guide projections 30 have opposing wall surfaces 30 a and 30 b in the direction around the optical axis 20 and opposing wall surfaces in the direction around the optical axis 20 forming the rectilinear guide groove 27. 27a, 2
7b.

The outer peripheral surface 30c of the rectilinear guide projection 30 which faces the bottom surface 27c of the rectilinear guide groove 27 has the tip of the arm 38 extending radially outward. Press outward in the direction. Using this spring property, the first lens barrel 1
3 is urged radially outward from inside on the optical axis side to support the first lens barrel 13 with respect to the second lens barrel 14 such that these lens optical axes do not tilt with respect to each other. . The straight guide groove 27, the arm 38 and the straight guide protrusion 30 may be provided at three divided positions around the optical axis.

The outer peripheral surface 30c of the rectilinear guide projection 30 is moved in the direction of the optical axis 20 so that the first and second lens barrels 13 and 14 have different distances from each other. While sliding in the radial direction. For this reason, when this sliding portion is brought into surface contact, the first and second
A load is applied to the relative movement of the lens barrels 13 and 14 in the direction of the optical axis 20 and the rotation of the rotary barrel 17, and the speed of zooming may be reduced. Therefore, in order to reduce the sliding resistance, the outer peripheral surface 30c of the rectilinear guide projection 30 has an arc-shaped cross section along the direction of the optical axis 20 (see FIG. 4) and a direction crossing the optical axis 20. The cross section is also arc-shaped (see Fig. 5)
That is, it is formed in a spherical shape.

As shown in FIG. 6, the cam 24 for the moving cylinder is
It comprises a storage guide section 40 and a moving cylinder movement prevention section 41. The storage guide section 40 is a range in which the movable cylinder cam follower 25 slides due to the rotation of the rotary cylinder 17 in the storage rotation area. The storage guide section 40 moves in the direction of the optical axis 20 between a retracted position in which the movable barrel 15 is retracted inside the fixed barrel 16 and a protruded position extended toward the subject side. When the movable barrel 15 is in the retracted position, the zoom lens 10 is in the retracted position.

The movable cylinder movement preventing portion 41 is a range in which the movable cylinder cam follower 25 slides due to the rotation of the rotating cylinder 17 in the variable magnification rotation range, and allows the movable cylinder 15 to rotate around the optical axis 20. The moving cylinder 15 has an arc shape along the direction around the optical axis 20 so as to prevent the moving cylinder 15 from moving in the direction of the optical axis 20. That is, the moving barrel 15 is
Is maintained in the protruding position while zooming between the telephoto position and the wide position.

As shown in FIG. 7, the first lens cam 26
Are the storage preparation guide section 42 and the first lens movement prevention section 4
3 and a zooming guide section 44. The first lens cam follower 28 slides in the rotation range of the movable barrel 15 corresponding to the rotation range of the rotary barrel 17 from the initial position to the rotation position A between the initial position and the intermediate position. Range. The storage preparation guide section 42 moves the first lens barrel 13 relative to the movable barrel 15 between a retracted position where the first lens barrel 13 is retracted and a storage preparation position where the first lens barrel 13 slightly projects toward the subject. When the first lens barrel 13 is at the retracted position,
The zoom lens 10 is in the retracted position.

The first lens movement preventing portion 43 is
7 is a range in which the first lens cam follower 28 slides in the rotation range of the movable barrel 15 according to the storage rotation range of No. 7. This first
The lens movement preventing portion 43 is formed in an arc shape along the direction around the optical axis 20 such that the first lens barrel 13 does not move in the direction of the optical axis 20 from the storage preparation position while allowing the rotation of the movable barrel 15. Is formed. That is, the first lens barrel 13
Is maintained at the storage preparation position until the zoom lens 10 changes from the retracted position to the telephoto position. The first lens movement prevention unit 43 maintains the first lens barrel 13 at the storage preparation position in a range where the rotary barrel 17 rotates in a range from the rotation position A to the intermediate position.

The zooming guide section 44 is a range in which the first lens cam follower 28 slides in the rotation range of the movable barrel 15 corresponding to the zooming rotation range of the rotary barrel 17. This zooming guide 4
Reference numeral 4 denotes a shape for moving the first lens barrel 13 in the direction of the optical axis 20 to change the focal length. Note that the storage preparation guide section 42 described above is not always necessary, and the storage preparation guide section 42 is omitted, and the moving cylinder 15 according to the storage rotation range of the rotary cylinder 17 is omitted.
The entire rotation range may be used as the first lens movement prevention unit 43.

Cam follower unit 29 for second lens
As shown in FIG. 8, the main and sub cam followers 46 and 47 are arranged at predetermined intervals in the direction of the optical axis 20. The main and auxiliary cam followers 46 and 47 are provided with first engagement portions 48 and 49 and second engagement portions 50 and 51, respectively. The first engagement portions 48 and 49 have the same diameter and engage with the second lens straight guide opening 23, respectively. The second engagement portions 50 and 51
The sections are frustoconical (truncated cone) with tapered shapes, and the diameter of the main cam follower 46 is larger than that of the sub cam follower 47 on the subject side. Since one of the first engagement portions 48 and 49 only needs to be engaged with the second lens straight guide opening 23, one of the first engagement portions 48 and 49 is made thinner. You may.

The main cam follower 46 has a first engagement portion 48
A third engaging portion 52 is formed between the first engaging portion 50 and the second engaging portion 50. The third engagement portion 52 is wider than the width of the second lens straight guide opening 23 and contacts the outer peripheral surface of the fixed barrel 16. Thereby, the second lens cam follower unit 2
9 is prevented from coming out of the second lens cam unit 21.

The second lens cam unit 21 includes a sub cam groove 54 and a main cam groove 55, as shown in FIG. In the sub cam groove 54, the second cam follower 47
The engaging portion 51 enters. The second engagement portion 50 of the main cam follower 46 enters the main cam groove 55. The sub and main cam grooves 54, 55 are provided with the second lens 1 for changing the focal length.
Guides 56, 5 for moving the lens 2 in the direction of the optical axis 20.
7 and storage guides 58 and 59 for moving the second lens 12 from the variable power guides 56 and 57 to the storage position.

The storage guides 58, 59 are linear
a, 59a and bent portions 58b, 59b. The straight portions 58a and 59a extend from the initial position to the rotation position B in front of the intermediate position when the rotary cylinder 17 is rotated toward the intermediate position. It is a linear trajectory that guides the user.
When the rotating barrel 17 is rotated toward the intermediate position in the range from the rotational position B to the intermediate position, the bent portions 58b and 59b move the second lens barrel 14 in the retreating direction toward the image plane. It is a curved trajectory that changes the moving direction of the second lens barrel 14 so as to move it.

When the rotary cylinder 17 rotates toward the end position within the range of the variable power rotation range,
It is a linear locus that moves the second lens barrel 14 in the retracting direction.

The movement trajectories of the main and sub cam followers 46 and 47 at the bent portions 58b and 59b are curved with the convex portions facing the subject side, and the diameter of the sub cam follower 47 is reduced with respect to the main cam follower 46. The radius of curvature of the locus of movement of the sub cam follower 47 that passes through the most image forming plane is smaller than the radius of curvature of the locus of moving of the main cam follower 46 that passes through the most image forming side. growing.

The range of the bent portion 58b of the sub cam groove 54 has the same radius of curvature as the moving locus of the moving locus of the sub cam follower 47 which passes through the image forming surface and the object side, and the wall surface on the image forming surface side has Is formed. Then, in a range other than the bent portion 58 b of the sub cam groove 54, the second
It is formed wider than the diameter of the engaging portion 51. Therefore, the sub cam groove 54 engages with the second engaging portion 51 of the sub cam follower 47 within the range of the bent portion 58b, and
No engagement occurs in a range other than b.

The main cam groove 55 has a width that engages with the second engaging portion 50 of the main cam follower 46 in a range other than the bent portion 59b, and has a second engagement portion of the main cam follower 46 in the range of the bent portion 59b. It is formed wider than the diameter of the joint 50. For this reason, the second engagement portion 50 of the main cam follower 46
Are engaged in a range other than the bent portion 59b of the main cam groove 55. As described above, since the auxiliary cam grooves 58b having a large radius of curvature are used in the bent portions 58b and 59b that change the moving direction of the second lens barrel 14, the second lens barrel 14 can be moved smoothly. The bent portions 58b, 59
b and the guide portions 56, 57 for zooming or the guide portions 58a for storage,
The second engagement portions 51, 52 are slightly within a boundary with the second engagement portion 59a.
May be provided with overlapping portions.

Next, the operation of the above embodiment will be briefly described. When the zoom lens 10 is in the retracted position, the moving barrel 1
The first lens barrel 5 and the first lens barrel 13 are housed inside the fixed barrel 16. As a result, as shown in FIG. 10, the second lens barrel 14 is located at the storage position C closest to the image plane, and the first lens barrel 13 is at the storage position D close to the second lens barrel 14. It is located in. Here, the bold line shown by the reference numeral (E) in the figure represents the movement trajectory of the first lens barrel 13, and the bold line shown by the reference numeral (F) represents the movement trajectory of the second lens barrel 14.

When the zoom motor 19 is driven in one direction, the rotary cylinder 17 rotates from the initial position to the end position. The driving of the rotating cylinder 17 is transmitted to the moving cylinder cam follower 25 engaged with the moving cylinder linear guide groove 22, and the moving cylinder 1 is driven.
5 rotates in conjunction with it. During this rotation, the movable barrel 15 moves in accordance with the displacement of the movable barrel cam 24 engaging with the movable barrel cam follower 25 in the direction of the optical axis 20. In addition, the rotation of the movable barrel 15 causes the first lens barrel 13 to engage the first lens cam 26 of the movable barrel 15 engaged with the first lens cam follower 28 and the second lens barrel 14 engaged with the straight guide groove 27. Of the movable cylinder 15 by the action of the
With respect to the optical axis 20.

The second lens frame 14 includes a main cam follower 46.
Is the second lens straight guide opening 23 provided in the fixed barrel 16.
And the main cam groove 55, it moves linearly in the direction of the optical axis 20 in conjunction with the rotation of the rotary cylinder 17.

The thin line (G) shown in FIG. 10 indicates the locus of movement of the first lens barrel 13 with respect to the movable barrel 15. While the rotating barrel 17 rotates from the initial position to the rotating position A, the first lens cam follower 28 slides on the storage preparation guide portion 42 of the first lens cam 26, so that the first lens barrel 13
From the retreat position H of the thin line (G) to the storage preparation position I. During this time, in the movable barrel 15, the movable barrel cam follower 25 slides on the storage guide portion 40 of the movable barrel cam 24. For this reason, the moving cylinder 15 is extended from the retreat position K to the protruding position L in the thin line (J) indicating the movement locus thereof. Therefore, the first lens barrel 13 moves in the direction of the optical axis 20 by the extension of the movable barrel 15 plus the extension of the first lens barrel 13 to the storage preparation position I. To the position M.

Rotary cylinder 17 from rotational position A to intermediate position
In the rotation range, the first lens cam follower 28 slides on the first lens movement preventing portion 43 of the first lens cam 26. Therefore, the movement of the first lens barrel 13 in the direction of the optical axis 20 with respect to the movable barrel 15 is prevented. Accordingly, the movement of the first lens barrel 13 during this time is moved together with the movable barrel 15 that moves with respect to the fixed barrel 16.

During the rotation of the rotary cylinder 17 from the initial position to the rotation position B, the engagement between the sub-cam groove 55 and the sub-cam follower 47 is released, and the main cam follower 46 engaged with the main cam groove 57 causes the first cam follower 46 to engage. The two-lens tube 14 is moved.

When the rotary barrel 17 rotates to the rotation position B, the second lens cam follower unit 29 enters the bending portions 58b and 59b of the second lens cam unit 21 which change the moving direction of the second lens barrel 14. . Bending part 58
b, 59b, the engagement between the main cam groove 55 and the main cam follower 46 is released, and the auxiliary cam groove 54 and the auxiliary cam follower 47 are engaged. For this reason, the sub cam groove 54 is formed at the bent portions 58b and 59b of the second lens cam unit 21.
The second lens barrel 1 by the sub cam follower 47
4 is moved. In the sub cam groove 54, the radius of curvature of the inner surface of the opposing wall surface at the bent portion 58b is larger than that of the main cam groove 55. Therefore, the bent portions 58b,
59b, the bent portion 5 of the main cam groove 55 having a small radius of curvature
9b is engaged with the bent portion 58b of the sub cam groove 54 having a larger radius of curvature than that of the second lens barrel 1.
4 can be moved smoothly, and the rotary cylinder 17
Can also be reduced.

When the rotary barrel 17 rotates to the intermediate position, the zoom lens 10 enters the telephoto position. In this state,
The movable barrel 15 is moved to the protruding position L with respect to the fixed barrel 16. Further, the first lens barrel 13 moves the optical axis 2 with respect to the moving barrel 15 in the rotation range of the rotating barrel 17 from the rotation position A to the rotation position B.
Since there is no movement in the direction of 0, it is located at the storage preparation position I of the thin line (G).
5 is moved in the direction of the optical axis 20 by the movement of 5
Move to the position O of. When the zoom lens 10 is in the telephoto position, the sub cam follower 47
The engagement between the main cam follower 46 and the auxiliary cam groove 54 is released, and the main cam follower 46 engages with the main cam groove 55 instead. This engaging position is the position of the boundary between the bent portion 59b and the zooming guide portion 57, and the second lens barrel 14 is located at the position N of the thick line (F).

As described above, the first lens 11 is
During rotation in the housing rotation range, the movement of the first lens barrel 13 with respect to the movable barrel 15 is stopped, and the first lens barrel 13 is moved in the direction of the optical axis 20 only by the movement of the movable barrel 15 with respect to the fixed barrel 16.

After the zoom lens 10 is in the telephoto position, the rotary barrel 17 is rotated in the variable power range. By the rotation in the variable magnification rotation range, the movable cylinder 15 is maintained at the protruding position L because the movable cylinder cam follower 25 slides on the movable cylinder movement prevention portion 41 of the movable cylinder cam 24.

On the other hand, when the rotary barrel 17 rotates in the variable-speed rotation range, the first lens barrel 13 moves to the first lens barrel cam follower 2.
8 slides on the zooming guide portion 44 of the first lens cam 26, so that light is applied to the movable barrel 15 by an amount corresponding to the displacement of the zooming guide portion 44 in the direction of the optical axis 20. It is moved in the direction of the axis 20. Therefore, during rotation of the first lens 11 in the variable magnification rotation range of 17, the first lens 11
The movement of the first lens barrel 13 with respect to the moving barrel 15 is stopped, and the moving of the first lens barrel 13 is performed in the optical axis 20 direction.

The second lens barrel 14 has a main cam follower 46.
Slides on the zooming guide portion 57 of the main cam groove 55, and is moved according to the displacement of the zooming guide portion 57 in the direction of the optical axis 20.

The first lens barrel 13 and the second lens barrel 14 are moved along the optical axis 2 so that their distances are different during zooming.
It is moved in the direction of 0. During this time, the second lens barrel 14
By the bias of the spring 37 in the direction of the optical axis 20, the play between the second lens cam unit 29 and the second lens cam follower unit 21 is absorbed, and the inclination with respect to the fixed cylinder 16 is also corrected. The rotation of the first lens barrel 13 around the optical axis is stopped by the rectilinear guide projection 30 of the second lens barrel 14, and the first lens barrel 13 is pressed in the radial direction. Can be suppressed as much as possible with respect to the optical axis of the second lens 12.

Further, since the radial bias of the rectilinear guide projection 30 is constant irrespective of the moving position of the second lens barrel 14, there is no change in the moving load of the first and second lens barrels 13, 14. Therefore, they can be moved smoothly.

Further, the straight guide projection 30 is provided on the outer peripheral surface 3.
0c is spherical. For this reason, the straight guide projection 3
The outer peripheral surface 30c of 0 presses the bottom surface 27c of the rectilinear guide projection 27 per point. Therefore, even if the first and second lens barrels 13 and 14 move relatively in the optical axis direction, the sliding resistance between the outer peripheral surface 30c and the bottom surface 27c can be reduced, and accordingly, the first lens barrel 13 and the first The two-lens cylinder 14 can be moved smoothly, and the load on the rotation of the rotary cylinder 17 can be reduced.

In the above embodiment, the second lens barrel 14 is arranged inside the first lens barrel 13. However, these are arranged in reverse, and a straight guide groove is provided on the outer periphery of the first lens barrel 13. The second lens barrel 14 is provided in these straight guide grooves.
May be engaged from the outside. Also,
The first lens barrel 13 is provided with a straight guide groove 27, and the second lens barrel 14 is provided with a straight guide projection 30. Conversely, the first lens barrel 13 is provided with a straight guide projection, and the second lens barrel 14 is moved straight. A guide groove may be provided.

In the above embodiment, the zoom lens has a two-group configuration. However, the present invention is not limited to this, and may have a configuration of three or more groups. In addition, the present invention is not limited to a zoom lens camera, and can be applied to a bifocal camera that switches between a telephoto position, a wide position, and a retracted position, for example. Further, although the tele position is set between the retracted position and the wide position, it is also possible to set the wide position between the retracted position and the tele position. In this case, the boundary between the variable power guide and the storage guide is the wide position.

[0053]

As described above, in the lens moving device according to the first aspect, the pressing member that engages with the first lens barrel and presses the first lens barrel in the radial direction is provided on the second lens barrel. The second lens barrel can support the first lens barrel without tilting the optical axis of the first lens with respect to the optical axes of the two lenses,
Thereby, for example, image blurring occurring during zooming can be suppressed as much as possible. Further, in the lens moving device according to the second aspect, the rectilinear guide protrusion that engages with the first lens barrel so as to be able to advance and retreat in the optical axis direction and stops the rotation of the first lens barrel about the optical axis is defined as a pressing member. Therefore, cost reduction can be achieved as compared with the case where a separate pressing member is provided.

In the lens moving device according to the third aspect, the first
Since the surface of the linear guide protrusion for pressing the bottom surface of the linear guide groove provided in the lens barrel is formed in a spherical shape, the first and second linear protrusions are formed.
The lens barrel can be relatively smoothly moved in the optical axis direction. Furthermore, in the lens moving device according to the fourth aspect, since the first lens barrel is biased in the radial direction by the second lens barrel that is offset, the inclination with respect to the reference photographing optical axis can be corrected. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a zoom lens using a lens moving device of the present invention.

FIG. 2 is a sectional view showing the zoom lens in a retracted position.

FIG. 3 is a sectional view showing the zoom lens in a telephoto position.

FIG. 4 is a sectional view showing the zoom lens in a wide position.

FIG. 5 is a cross-sectional view of the first lens barrel and the second lens barrel cut along a direction intersecting the optical axis.

FIG. 6 is a developed view showing a cam for a movable cylinder provided on a fixed cylinder.

FIG. 7 is a development view showing a first lens barrel cam provided on the movable barrel.

FIG. 8 is a perspective view of a main part showing a second lens barrel cam follower unit.

FIG. 9 is a perspective view of a main part showing a second lens barrel cam unit.

FIG. 10 is an explanatory diagram showing a movement locus of a first lens barrel, a second lens barrel, a moving barrel, and the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 1st lens 12 2nd lens 13 1st lens barrel 14 2nd lens barrel 15 Moving cylinder 16 Fixed cylinder 17 Rotating cylinder 22 Linear guide groove for moving cylinder 23 Linear guide opening for 2nd lens 24 Moving cylinder cam 27 Straight guide Groove 30 Straight guide protrusion 37 Spring 38 Arm

Continued on the front page (72) Inventor Ryuta Sasaki 1-3324 Uetake-cho, Omiya-shi, Saitama F-term in Fuji Photo Optical Co., Ltd. (Reference) 2H044 AC01 BD07 BD10 BD16 BD18 DA01 DA02 DB02 DD03 EF03 2H101 DD00

Claims (5)

[Claims] 1. A lens moving device for moving a first lens barrel having a first lens and a second lens barrel having a second lens in an optical axis direction, wherein the second lens barrel includes: A lens moving device, further comprising a pressing member that engages with the first lens barrel and presses the first lens barrel in a radial direction. 2. The device according to claim 1, wherein the pressing member is a rectilinear guide protrusion that engages with the first lens barrel so as to be able to advance and retreat in the optical axis direction, and stops rotation of the first lens barrel about the optical axis. The lens moving device according to claim 1, wherein 3. The linear guide projection is provided on an arm protruding toward a first lens barrel, and the tip of the arm extends radially outward. The lens moving device according to claim 2. 4. The lens moving device according to claim 2, wherein the linear guide protrusion has a spherical surface that presses a bottom surface of the linear guide groove provided in the first lens barrel. . 5. The second lens barrel is moved relative to the first lens barrel in the optical axis direction, and is urged in one of the optical axis directions by an urging member during the movement. The lens moving device according to any one of claims 1 to 4, wherein: