JP2001100081A - Lens moving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten the rotational load of a cam cylinder. SOLUTION: A cam groove which moves a lens cylinder along the optical axis has a bent part for changing the moving direction of the lens cylinder. The cam groove is composed of two cam grooves 54 and 55 which are different in width. Two cam followers 50 and 51 which differ in diameter are put in the narrow and wide cam grooves 54 and 55. At the bent part, an arcuate track passing through the most imaging plane side of the movement track of the small-diameter cam follower 51 has a larger radius of curvature than an arcuate track passing through the most imaging plane side of the movement track of the large-diameter cam follower 50. In a rotation area of the bent part, a 2nd lens cylinder 14 is moved by engaging the small-diameter cam follower 51 with the narrow cam groove 54 by using the arcuate track of the cam follower 51 which has the larger radius of curvature.

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 that moves a lens barrel in an optical axis direction using a cam.

[0002]

2. Description of the Related Art Heretofore, a cam mechanism has been known as a means for moving a lens barrel in an optical axis direction. The cam mechanism includes a cam groove, a fixed straight guide opening, and a cam follower. The cam groove is provided on the rotating cylinder at the circumference. The cam follower is engaged with the straight guide opening and the cam groove. The cam follower is provided in the lens barrel. The lens barrel moves in the optical axis direction by the rotation of the rotary barrel about the optical axis, which guides the cam follower to the movement of the intersection between the cam groove and the straight guide opening.

[0003]

The shape of the cam is determined by the movement locus of the lens. For example, when the lens is to be moved from the extending direction in which the lens is extended toward the subject side in the opposite extending direction, a method disclosed in Japanese Patent Application Laid-Open No. H10-28108
As described in Japanese Patent No. 2394, for example, a cam-shaped locus is required in the locus of the cam. In this bent portion, the pressure angle is larger than the cam trajectory moved in one of the optical axis directions, so that a load is applied to the movement of the cam follower, and a large load is applied to the rotation of the rotary cylinder provided with the cam. There was such a disadvantage.

The present invention has been made in consideration of the above circumstances, and has as its object to provide a lens moving device which reduces a rotational load applied when a cam follower is moved at a bent portion of a cam.

[0005]

In order to achieve the above object, in the lens moving device according to the first aspect, the cam pins are constituted by two cam pins having different diameters.
When the first and second lens barrels are relatively rotated, the cam pins pass through a bent portion. The other barrel is moved by engaging the small-diameter cam pin, and the other barrel is moved by engaging the large-diameter cam pin with the wide cam in the rotation range where the cam pin passes through a portion other than the bent portion. It was made.

In the lens moving device according to the second aspect, the two cam pins are provided separated by a predetermined distance in the optical axis direction. Further, in the lens moving device according to the third aspect, zooming or focusing is performed in a rotation range where the large diameter cam pin is engaged with the wide cam.

[0007]

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.

[0008] The zoom lens 10 is rotated by rotating the rotary cylinder 17 in a storage rotation range from an initial position to an intermediate position as shown in FIG.
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 second lens barrel 1 is provided on the inner peripheral surface of the fixed barrel 16.
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.

Further, 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 the image plane of the zoom lens 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.

Each arm 38 has a linear guide projection 30 formed on the outer periphery on the distal end side. These rectilinear guide protrusions 30 have their opposing wall surfaces in the direction around the optical axis 20 abutting against the opposing wall surfaces in the direction around the optical axis 20 that constitute the rectilinear guide grooves 27.

As shown in FIG. 5, the moving cylinder cam 24 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 moving cylinder movement preventing portion 41 is a range in which the moving cylinder cam follower 25 slides due to the rotation of the rotating cylinder 17 in the variable magnification rotation range, and allows the rotation of the moving cylinder 15 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. 6, 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 variable power 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 variable power 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.

Second lens cam follower unit 29
Is composed of two main and sub cam followers 46 and 47 separated from each other by a predetermined distance in the direction of the optical axis 20, as shown in FIG. 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. In the present embodiment, the maximum diameter of the second engagement portion 50 is set to 1.7 m.
m, the maximum diameter of the second engagement portion 51 is 0.8 mm. In addition, since one of the first engaging portions 48 and 49 only needs to be engaged with the second lens straight guide opening 23, one of the first engaging 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.

As shown in FIG. 8, the second lens cam unit 21 moves the second lens barrel 14 to the variable power position between the telephoto end and the wide end in the variable power rotation range of the rotary barrel 17. The second lens barrel 14 is moved between the telephoto end and the storage position in the storage rotation range. Further, the second lens cam unit 21 is moved in the rotation range between the intermediate position in the storage rotation range of the rotary barrel 17 and the rotation position B slightly closer to the initial position side.
4 has a bent portion for changing the moving direction.

The second lens cam unit 21 includes a sub cam groove 54 and a main cam groove 55. Sub cam groove 5
4, the second engagement portion 51 of the sub cam follower 47 enters. The second engagement portion 50 of the main cam follower 46 enters the main cam groove 55. The bent portion has a curved trajectory so as to move the second lens barrel 14 from the extending direction toward the subject side to the extending direction toward the image plane.

Primary and secondary cam followers 46, 4 at the bend
The movement locus of the sub cam follower 4 is shown in FIG.
7 is closer to the image-forming surface side, that is, the arc-shaped portion 47b of the moving trajectory 47a passing through the most inferior angle side than the arc portion 47b of the moving trajectory of the main cam follower 46. The radius of curvature of the arc portion 46b of the moving locus 46a that passes is smaller. This is because the second engagement portion 50 of the main cam follower 46 is opposed to the second engagement portion 51 of the sub cam follower 47.
This is because the diameter is large. Accordingly, when the main lens groove 57 and the main cam follower 46 are engaged with each other at the bent portion to move the second lens barrel 14, the auxiliary cam groove 56 and the auxiliary cam follower 47 are engaged with each other, and the second lens barrel 14 is moved. Since the pressure angle at the bent portion becomes larger than when the lens barrel is moved, a load is applied to the movement of the second lens barrel 14 and the rotating barrel 1
A large load is generated in the rotation of No. 7.

Therefore, in order to reduce the rotational load at the bent portion, as shown in FIG.
7 is formed with a width that does not engage with the second engaging portion 50 of the main cam follower 46, and instead, the sub-cam groove 56 is formed with a width that engages with the second engaging portion 51 of the sub-cam follower 47.
That is, the arc-shaped portion 51a on the inferior angle side of the sub cam groove 56 is formed with the radius of curvature of the arc-shaped portion 47b constituting the movement trajectory described with reference to FIG. In a range other than the bent portion, the main cam groove 57 is formed to have a width to be engaged with the second engagement portion 50 of the main cam follower 46, and the sub-cam groove 56 is replaced by the second engagement portion 51 of the sub-cam follower 47. Is formed so as not to be engaged with.

As described above, in the bent portion for changing the moving direction of the second lens barrel 14, the auxiliary cam groove 58b having a large radius of curvature of the arc portion of the wall on the inferior angle side of the opposing wall surfaces is used. Therefore, the second lens barrel 14 can be moved smoothly, and the load on the rotation of the rotary barrel 17 can be reduced.

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. 11, 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, FIG.
The bold line indicated by indicates the movement locus of the first lens barrel 13, and the bold line indicated by the symbol (F) indicates the movement locus of the second lens barrel 14.

When the zoom motor 19 is driven in one direction, the rotary barrel 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.

A thin line (G) shown in FIG. 11 indicates a movement locus 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. For this reason, the first lens barrel 13 moves in the direction of the optical axis 20 by the extension of the movable barrel 15 and the extension of the first lens barrel 13 to the storage preparation position I, and moves in the direction of the thick line (E). Move to our 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 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 a bent portion of the second lens cam unit 21 which changes the moving direction of the second lens barrel 14. When the main cam groove 55 enters the bent portion, the engagement between the main cam groove 55 and the main cam follower 46 is released, and the sub cam groove 54 and the sub cam follower 47 are engaged. Therefore, in the bent portion, the second lens barrel 14 is moved by the sub cam follower 47 engaging with the sub cam groove 54. The sub cam groove 54 is formed such that the arc portion 51a of the inferior angle side wall surface of the opposing wall surface at the bent portion is the arc portion 46b of the most inferior angle side motion locus 46a of the main cam follower 46 motion locus.
It is formed with the same radius of curvature as the arc portion 47b having a larger radius of curvature than the arc portion 47b. Therefore, in the bent portion, the main cam groove 5
5, the main cam follower 46 is engaged with the second lens barrel 14
The second lens barrel 14 can be moved more smoothly, and the rotational load on the rotary barrel 17 can be reduced as compared with the case of moving.

When the rotary cylinder 17 rotates to the intermediate position, the zoom lens 10 is in 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. At this time,
The second lens barrel 14 is located at the position N in 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 rotating barrel 17 rotates in the variable power 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, the movement of the movable barrel 15 with respect to the fixed barrel 16 is stopped during the rotation of the rotary barrel 17 in the variable magnification rotation range, and the first lens 11 is moved only by the movement of the first lens barrel 13 with respect to the movable barrel 15. It is moved in the direction of 20.

On the other hand, the second lens barrel 14 is moved in the direction of the optical axis 20 by the main cam follower 46 which engages with the main cam groove 55 while the rotary barrel 17 rotates in the variable speed rotation range.

In the above embodiment, the auxiliary cam follower is disposed on the subject side with respect to the main cam follower. However, the present invention is not limited to this, and may be disposed on the image forming surface side. In this case, the sub cam groove is also arranged on the image plane side with respect to the main cam groove.
Although the auxiliary cam follower is separated from the main cam follower by a predetermined distance in the optical axis direction, in the present invention, the direction of the predetermined distance is not limited to the optical axis direction, and may be shifted in any direction. Although the cam follower has a rotatable roller provided on the shaft, it may be a simple cam pin.

The rotary barrel 17 and the second lens barrel 14 in the above embodiment correspond to the first and second lens barrels of the present invention. In the above embodiment, the second cylinder cam unit 2 is
And the second lens barrel 14 is provided with a cam follower unit 29 for the second lens.
7 is provided with a cam follower unit for the second lens,
The second lens cam unit may be provided with a second lens cam unit. Further, in the above-described embodiment, the zooming movement is performed by using the cam. further,
In the above embodiment, the zoom lens has a two-group configuration. However, the present invention is not limited to this, and a three or more-group configuration may be employed. 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. Furthermore, the tele position is set between the retracted position and the wide position,
It is also possible to set a wide position between the retracted position and the tele position.

[0044]

As described above, in the lens moving device of the present invention, when the cam pin passes through the bent portion when the first and second lens barrels are relatively rotated, the narrow cam has a small diameter. While moving the other lens barrel by engaging with the cam pin of
In the rotation range where the cam pin passes through a portion other than the bent portion, the large-diameter cam pin is engaged with the wide cam to move the other lens barrel. According to this, the diameter of the cam pin is reduced when the wide cam is bent at a width engaging with the large-diameter cam pin and when the narrow cam is bent at a width engaging with the small-diameter cam pin. The radius of curvature of the arc trajectory on the inferior side wall surface of the opposing wall surface of the narrow cam becomes larger than that of the arc trajectory on the inferior side wall surface of the opposing wall surface of the wide cam. Thereby, the load when the first and second lens barrels are relatively rotated can be reduced.

In the lens moving device according to the second aspect, the two cam pins are provided at a predetermined interval in the optical axis direction.
Since the two cams do not intersect, and therefore the processing is simplified, the cost can be reduced. Further, in the lens moving device according to the third aspect, since zooming or focusing is performed in a rotation range where the large-diameter cam pin is engaged with the wide cam, the movement of the lens barrel can be performed with high precision.

[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 development view showing a movable barrel cam provided on the fixed barrel.

FIG. 6 is a developed view showing a first lens barrel cam provided on the movable barrel.

FIG. 7 is a perspective view of a main part showing a second lens barrel cam follower unit.

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

FIG. 9 is an explanatory diagram showing the movement trajectory of the main and sub cam followers at the bent portion, and is shown based on the movement trajectory of the center of the cam follower.

FIG. 10 is an explanatory diagram showing shapes of main and sub cam grooves at bent portions.

FIG. 11 is an explanatory diagram showing movement trajectories of a first lens barrel, a second lens barrel, a moving barrel, and the like.

[Explanation of symbols]

 Reference Signs List 11 first lens 12 second lens 14 second lens barrel 15 moving barrel 16 fixed barrel 17 rotating barrel 21 second lens cam unit 22 moving barrel linear guide groove 23 second lens linear guide opening 24 moving barrel cam 46 Main cam follower 47 Secondary cam follower 54 Secondary cam groove 55 Main cam groove

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ryuta Sasaki 1-3324 Uetake-cho, Omiya-shi, Saitama F-Terminal, Fuji Photo Optical Co., Ltd. 2H044 BD08 BD09 BD17 DA01 DA02 DB02 DD03 EF03 EF06 EF07 2H101 BB07 DD62

Claims (3)

[Claims] A first lens barrel provided with a cam pin; and a second lens barrel provided with a cam engaged with the cam pin, wherein the first and second lens barrels are relatively rotated. The cam has a bent portion that moves the other barrel in the optical axis direction with respect to one of the barrels and changes the moving direction of the other barrel from one of the optical axis directions to the other. In the lens moving device provided, the cam pins are constituted by two cam pins having different diameters, and the cams are constituted by a narrow cam and a wide cam into which the two cam pins are respectively inserted. In a rotation region where the cam pin passes through the bent portion when the two lens barrels are relatively rotated, a narrow cam is engaged with a small-diameter cam pin to move the other lens barrel, and the cam pin In the rotation range where Lens moving device is characterized in that so as to move the other lens barrel engaged with the cam pins of large diameter in wide cam. 2. The lens moving device according to claim 1, wherein the two cam pins are provided at a predetermined distance from each other in the optical axis direction. 3. The lens moving device according to claim 1, wherein zooming or focusing is performed in a rotation range in which the large-diameter cam pin is engaged with a wide-width cam.