JP2001100078A - Lens moving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a zoom lens low in cost and compact in size. 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 from its storage position to a variable power area by the displacement of a cam 21 for a 2nd lens provided to the rotary cylinder 17. The 1st lens cylinder 13 is moved continuously from its storage position to the variable power area by the displacement of a cam 24 for the moving cylinder and a cam 26 for a 1st lens provided to the moving cylinder 15. While the 1st lens cylinder 13 is moved, the rotation is stopped by a rectilinear guide projection 30 provided to the 2nd lens cylinder 14.

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 guides a lens straight.

[0002]

2. Description of the Related Art Heretofore, cams or helicoids have been known as guide means for moving a lens barrel in the optical axis direction. The cam or helicoid is provided between the lens barrel and a lens barrel that rotates relatively to the lens barrel. At this time,
If one of the lens barrels is not stopped, it cannot move in the optical axis direction. Therefore, a rectilinear guide member for stopping rotation is engaged with the lens barrel.

For example, as described in Japanese Utility Model Publication No. Hei 7-36337, in the case of a two-stage extension type lens barrel in which two lens barrels, a lens barrel and a moving barrel, are extended in the optical axis direction, a lens barrel is used. A guide cylinder is used as a straight guide member of the above. The guide tube includes a frame portion and a ring portion. The frame part is
It is rotatably attached to the rear end of the moving cylinder. The guide portion has an L-shape in which a long piece is elongated in the optical axis direction. The long side passes through the inside of the moving barrel and is inserted into a straight guide groove provided on the inner periphery of the first lens barrel. It faces the outer periphery from the rear end of the movable barrel and engages with a linear guide groove provided on the inner periphery of the fixed barrel. Thus, in the two-stage extension type structure, the lens barrel and the movable barrel are extended toward the subject with respect to the fixed barrel, and during this time, the long side of the guide portion is guided so as not to fall out of the straight guide groove of the lens barrel. The rotation of the lens barrel is stopped by following the movement of the lens barrel by moving the barrel together with the movable barrel in the optical axis direction.

[0004]

According to the structure of the lens barrel described above, since the guide barrel moves together with the movable barrel,
While the length of the long side of the guide portion along the optical axis direction can be shortened, the number of parts increases due to the provision of the guide tube, resulting in an increase in cost. In addition, the length of the entire zoom lens in the optical axis direction is increased by the amount corresponding to the provision of the guide cylinder at the rear end of the movable cylinder, and there is a disadvantage that the lens barrel becomes large.

The present invention has been made in view of the above circumstances, and has as its object to provide a lens moving device capable of reducing the number of lens barrels to be used and achieving low cost and miniaturization. I do.

[0006]

In order to achieve the above object, in the lens moving device according to the first aspect, the rotation of the first lens barrel around the optical axis is performed by the linear guide portion provided in the second lens barrel. It is intended to be regulated.

In the lens moving device according to the second aspect, the rectilinear guide portion is a rectilinear guide protrusion that engages with the rectilinear guide groove provided in the first lens barrel, and the rectilinear guide protrusion is opposed to the bottom surface of the rectilinear guide groove. It has a spherical surface.

[0008]

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.

As shown in FIG. 2, the zoom lens 10 rotates 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 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 contains 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. The cam follower unit 29 for the second lens, the cam unit 21 for the second lens, and the rectilinear guide opening 23 for the second lens
It is provided at each of three divided positions around zero.

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.

The straight guide projection 30 is provided on the second lens barrel 14.
Is extended to the subject side, and the outer peripheral surface on the front end side is protruded by one step, and is provided at two positions along the circumferential direction on the protruding surface 14a (see FIG. 1). Face 1
4 a slides on the inner peripheral surface of the first lens barrel 13. As shown in FIG. 5, these rectilinear guide projections 30
Opposing wall surfaces 30a, 30b in a direction around the optical axis 20 which constitute the straight guide groove 27 are in contact with the opposing wall surfaces 27a, 27b, respectively. In addition,
The rectilinear guide groove 27 and the rectilinear 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 facing the bottom surface 27c of the rectilinear guide groove 27 is
7 is formed at a height that does not contact the bottom surface 27c. However, there is a risk of contact due to a variation in forming accuracy or the like. The outer peripheral surface of the first lens barrel 13 is supported by the inner peripheral surface of the movable barrel 15. However, if the first lens barrel 13 is tilted when the first lens barrel 13 is extended from the movable barrel 15, the linear guide projection 30 will not move. The outer peripheral surface 30c is the bottom surface 2 of the linear guide groove 27.
7c. When contact is made, the rotating cylinder 17
There is a risk that a load will be applied to the rotation of the lens and the speed of zooming will decrease. Therefore, in order to reduce the resistance at the time of contact, the outer circumferential surface 30c of the straight guide projection 30 has an arc-shaped cross section along the direction of the optical axis 20 (see FIG. 4) and the optical axis 2
The cross section in the direction intersecting zero is also formed in an arc shape (see FIG. 5), that is, 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 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. 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 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
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 variable power range, the variable power guides 56 and 57
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 movement locus of the movement locus of the sub cam follower 47 that passes through the image formation surface and the object side, and the wall surface on the image formation side has the same radius. 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.

A thin line (G) shown in FIG. 10 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. 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 main cam follower 46. 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, 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 rotating 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, 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.

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 in the direction of the optical axis 20 so that the distance between them is different. During this time, the rotation of the first lens barrel 13 of the second lens barrel 14 is stopped by the rectilinear guide projection 30 that engages with the rectilinear guide groove 27. Straight guide projection 3
In the case of No. 0, since the outer peripheral surface 30c is spherical, even if the outer peripheral surface 30c of the linear guide projection 30 comes into contact with the bottom surface 27c of the linear guide protrusion 27, the contact resistance is reduced. Therefore, the load on the rotation of the rotary cylinder 17 can be reduced.

In the above embodiment, the first lens barrel 13 is provided with the straight guide groove 27, and the second lens barrel 14 is provided with the straight guide projection 30, but the first lens barrel 13 is provided with the straight guide projection. The second lens barrel 14 may be provided with a straight guide groove.

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.

[0046]

As described above, in the lens moving device of the present invention, the rotation of the first lens barrel is stopped by the first lens linear guide provided on the second lens barrel.
There is no need to separately provide a guide tube, and therefore, cost reduction and compactness can be achieved.

[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 barrel 16 Fixed barrel 17 Rotating barrel 21 Cam unit for 2nd lens 22 Linear guide groove for movable barrel 23 Linear guide opening for 2nd lens 24 Moving cylinder cam 27 linear guide groove 30 linear guide protrusion

Continued on the front page (72) Inventor Ryuta Sasaki 1-3324 Uetake-cho, Omiya-shi, Saitama Fuji Photo Optical Co., Ltd. F-term (reference) 2H044 BD07 BD10

Claims (2)

[Claims] 1. A lens moving device for changing a focal length by moving a first and a second lens barrel respectively having a first and a second lens arranged in order from an object side in a direction of an optical axis. Wherein the first lens barrel is
A lens moving device, wherein rotation around an optical axis is regulated by a linear guide portion provided in a lens barrel. 2. The rectilinear guide portion is a rectilinear guide protrusion that engages with a rectilinear guide groove provided in a first lens barrel. The rectilinear guide protrusion has a spherical surface facing a bottom surface of the rectilinear guide groove. The lens moving device according to claim 1, wherein the lens moving device is formed.