JP2001235672A - Lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device which is miniaturized while securing the stable operation of a barrel body by forming a cam groove and a straight advance groove are crossing. SOLUTION: A second lens cam groove 21 to move a second lens barrel along an optical axis 20 and a moving barrel straight advance groove 22 to guide a moving barrel along optical axis 20 are formed on the inner peripheral surface of a rotary barrel 17, and the second lens cam groove 21 and the moving barrel straight advance groove 22 are formed so as to be respectively crossed. Thus, the inclining angle of the second lens cam groove 21 is freely set regardless of the existence of the moving barrel straight advance groove 22, so that the second lens barrel is stably operated. Also, the lens device is made as small as possible in size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens device,
In particular, the present invention relates to a lens device used in a retractable camera having a zoom function.

[0002]

2. Description of the Related Art A cam mechanism is known as a means for moving a lens barrel along an optical axis. The cam mechanism includes, for example, three cam pins provided on an outer peripheral surface of a lens barrel, the cam pins being engaged with three rectilinear holes formed in the fixed barrel, and three cam grooves formed in the rotary barrel. It is constituted by engaging. Alternatively, 3 on the outer peripheral surface of the lens barrel
A cam pin is provided, and the cam pin is engaged with three cam holes formed in the fixed cylinder, and is engaged with three rectilinear grooves formed in the rotating cylinder.
In the cam mechanism configured as described above, when the rotary barrel is rotated, the lens barrel moves by a displacement along the optical axis of the cam groove.

[0003] By the way, some cam mechanisms are constructed so that a plurality of lens barrels can be moved by one rotating barrel. In this case, the moving mechanism is moved to the inner peripheral surface of the rotating barrel. Cam grooves or straight grooves are formed as many as the number of lens barrels. Conventionally, when the cam groove and the rectilinear groove are formed in one rotary cylinder, they are provided independently so as not to cross each other.

[0004]

However, if each of the cam grooves and the rectilinear grooves is formed independently on the inner peripheral surface of the rotary cylinder so as not to intersect with each other, the inclination of the cam grooves becomes steep and the operating load is reduced. There is a disadvantage that the lens barrel cannot operate stably due to an increase. On the other hand, if the inclination of the cam barrel is made gentle to stably operate the lens barrel, there is a disadvantage that the diameter of the lens barrel becomes large and the lens device cannot be downsized.

[0005] On the other hand, a zoom lens device has been proposed by the present applicant to reduce the overall length in the optical axis direction by forming cam grooves on the inner peripheral surface of the rotary cylinder so as to intersect each other. Although disclosed in Japanese Unexamined Patent Publication No. Hei 10-282394, when the cam grooves cross each other, there is a disadvantage that the position of the crossing portion is limited and the degree of freedom in design is low.

That is, when the cam grooves cross each other,
If the two cam grooves do not cross at some angle,
A cam pin passing through each cam groove is guided to the other cam groove at the intersection. For this reason, when the cam grooves cross each other, it is necessary to first collate the two cam grooves and consider a position such that the cam grooves intersect at a certain angle. As a result, the degree of freedom in design decreases.

Further, the intersection position of the cam groove selected in this manner does not always coincide with the intersection position of the cam groove which is optimal for minimizing the diameter of the lens barrel, and stable operation is ensured. However, there is a limit in reducing the size of the lens barrel by intersecting the cam grooves.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lens device that can be downsized while ensuring stable operation of a cylindrical body.

[0009]

In order to achieve the above object, the present invention provides a lens device in which a straight groove and a cam groove are formed on an inner peripheral surface of a cylindrical body. Are provided so as to intersect with each other.

According to the present invention, the cam groove and the rectilinear groove cross each other and are formed on the inner peripheral surface of the cylindrical body. Accordingly, the inclination of the cam groove can be set freely irrespective of the rectilinear groove, so that each cylinder can be operated stably and the lens device can be made as small as possible. That is,
Since the rectilinear groove is formed in parallel with the optical axis, it does not affect the diameter of the cylindrical body at any position where it intersects with the cam groove. Thus, the cam groove and the straight groove can intersect at a position where the intersection angle is the largest. As a result, the diameter of the cylinder can be reduced as much as possible while ensuring stable operation of the cylinder.

In order to achieve the above object, the present invention provides the lens device according to claim 1, wherein said rectilinear groove and said cam groove are formed at different depths from each other. I do.

According to the present invention, by forming the rectilinear grooves and the cam grooves at different depths, the cam pins engaged with the rectilinear grooves can be prevented from entering the cam grooves.
It is possible to prevent a cam pin engaged with the cam groove from entering the rectilinear groove.

According to the present invention, in order to achieve the above object, the cam groove comprises a variable magnification area for performing a magnification operation on a lens barrel engaged via a cam pin and a storage area for performing a storage operation. 3. The lens device according to claim 1, wherein the rectilinear grooves intersect in the storage area.

According to the present invention, in a lens device having a zoom function and a lens barrel extended from the camera body only during use, the straight groove is crossed in the storage area of the cam groove, so that the crossing can be achieved. Thus, even if the cam pin is caught, the operation can be performed without affecting the optical performance.

According to the present invention, in order to achieve the above object, a plurality of first grooves are formed at predetermined intervals on an inner peripheral surface of a cylindrical body, and a plurality of second grooves are formed at predetermined intervals. In the lens device, the first groove or the second groove is formed at unequal intervals in the circumferential direction, so that the first groove and the second groove intersect with each other, and each intersection is formed. Provided is a lens device characterized in that the position is shifted along an imaging optical axis.

According to the present invention, by shifting the intersection position of the first groove and the second groove in the direction of the photographing optical axis, the timing at which each cam pin passes through the intersection can be shifted, and the cam pin can be caught at the intersection. This can prevent the occurrence of operation failure due to.

According to another aspect of the present invention, there is provided a lens device in which a plurality of first grooves and a plurality of second grooves are formed on an inner peripheral surface of a cylindrical body. The first groove and the second groove are formed so as to intersect with each other by displacing the formation positions of the respective second grooves along the photographing optical axis, and the respective intersection positions are defined as the photographing optical axis. A lens device characterized by being shifted along.

According to the present invention, by shifting the intersection position of the first groove and the second groove in the direction of the photographing optical axis, it is possible to shift the timing at which each cam pin passes through the intersection, and to catch at the intersection. This can prevent the occurrence of operation failure due to.

According to another aspect of the present invention, there is provided a lens device in which a first groove and a second groove are formed on an inner peripheral surface of a cylindrical body. Are formed so as to intersect with each other, and the length of the cam pin engaged with the first groove is formed longer than the width of the second groove at the intersection.

According to the present invention, the length of the cam pin engaging with the first groove is formed longer than the width of the second groove at the intersection, so that the cam pin engaging with the first groove is formed in the second groove. It can be prevented from entering.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lens device according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an external structure of an electronic still camera to which a lens device according to the present invention is applied.

As shown in FIG. 1, the electronic still camera 1 has a camera body formed in a rectangular box shape.
A lens device 2, a finder window 3, a strobe light control sensor 4, a self-timer lamp 5, and the like are provided on a front portion thereof. In addition, a pop-up strobe 6, a release switch 7 and the like are provided on an upper surface thereof, and a finder eyepiece, a liquid crystal display panel, operation keys, and the like (not shown) are provided on a rear surface thereof. The electronic still camera 1 is a retractable type, and the lens device 2 is used only when used.
The lens barrel extends from the camera body and projects from the front of the camera body.

FIG. 2 is an exploded perspective view of the lens device 2 applied to the electronic still camera 1 described above. Also, FIG.
FIG. 5 is a side sectional view of a lens device 2 applied to the electronic still camera 1 described above. FIG. 3 shows a state in which the lens device 2 is in the retracted position, and FIG.
5 and FIG. 5 show a state where the lens device 2 is in the tele position and a state where the lens device 2 is in the wide position, respectively.

As shown in FIGS. 2 to 5, the lens device 2 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 rotating barrel. It is composed of a cylinder 17.

The rotary cylinder 17 has a gear portion 18 formed on the outer peripheral surface thereof. The gear section 18 includes a zoom motor 19
Is transmitted. When the drive of the zoom motor 19 is transmitted to the gear portion 18, the rotating cylinder 17 is rotated while being in contact with the outer periphery of the fixed cylinder 16.

Here, the lens device 2 is mounted on the rotating cylinder 17.
Is "storage rotation range" from "initial position" to "intermediate position"
3, the state is changed from the retracted position shown in FIG. 3 to the tele-position shown in FIG. 4, and the rotating cylinder 17 is moved from the "intermediate position" to the "end position". By rotating in the "double rotation range", the state is changed from the tele position shown in FIG. 4 to the wide position shown in FIG.

The inner peripheral surface of the rotary cylinder 17 has a second
Second movement for moving the lens barrel 14 along the optical axis 20
A lens cam groove 21 and a moving cylinder rectilinear groove 22 for guiding the moving cylinder 15 along the optical axis 20 are formed at three divided positions around the optical axis 20.

The fixed barrel 16 has a second lens rectilinear hole 23 for guiding the second lens barrel 14 linearly along the optical axis 20, and a moving barrel 15 for moving the movable barrel 15 along the optical axis 20. Are formed at three divided positions around the optical axis 20.

On the outer peripheral surface of the movable barrel 15, a movable barrel cam pin 25 is provided at three divided positions around the optical axis 20. The moving cylinder cam pin 25 is engaged with a moving cylinder cam hole 24 formed in the fixed cylinder 16 and a moving cylinder straight groove 22 formed in the rotating cylinder 17.

The inner peripheral surface of the moving cylinder 15 has a first
A first for moving the lens barrel 13 along the optical axis 20
The lens cam groove 26 is formed at three divided positions around the optical axis 20.

The first lens barrel 13 holds the first lens 11 at the inner peripheral portion at the front end. The inner peripheral surface of the first lens barrel 13 has a pair of linear guide grooves 27 along the optical axis 20.
Are formed at predetermined intervals. A linear guide projection 30 formed on an arm 38 of the second lens barrel 14 is engaged with the linear guide groove 27.

On the outer peripheral surface of the first lens barrel 13, a first lens cam pin 28 is provided around the optical axis 20.
It is provided at the division position. The first lens cam pin 28 is engaged with a first lens cam groove 26 formed on the inner peripheral surface of the movable barrel 15.

On the outer peripheral surface of the second lens barrel 14, a second lens cam pin 29 is provided at three divided positions around the optical axis 20. The second lens cam pin 29 includes a second lens cam groove 21 formed on the inner peripheral surface of the rotary cylinder 17,
It is engaged with the second lens straight advance hole 23 formed in the fixed barrel 16.

A pair of springs 37 is hung on the rear end of the second lens barrel 14 and the rear end of the fixed barrel 16. The spring 37 is provided at two divided positions around the optical axis 20 and urges the second lens barrel 14 toward the image forming surface.

A pair of arms 38 are integrally formed at a front end of the second lens barrel 14 at a predetermined interval. The arm 38 has a narrow width extending from the front end of the second lens barrel 14 toward the subject, and a straight guide projection 30 is integrally formed on the outer periphery of the front end. The straight guide projection 30 is provided in the first lens barrel 1.
3 are engaged with the rectilinear guide grooves 27 formed on the inner peripheral surface thereof.
In contact with both wall surfaces 27a and 27b. The first lens barrel 13 includes the linear guide projection 30 and the linear guide groove 27.
The rotation of the second lens barrel 1 is stopped.
4 is guided linearly in the optical axis direction.

The second lens barrel 14 is made of an elastically deformable material such as plastic, and each arm 38 is formed with its front end extending radially outward. I have. For this reason, the straight guide projection 30
Is engaged with the linear guide groove 27, the linear guide protrusion 30
Is pressed against the bottom 27c of the linear guide groove 27. As a result, the first lens barrel 13 is
The lens barrels 14 are supported so as not to be inclined with respect to each other.

The straight guide projection 30 has a hemispherical tip surface 30c in order to reduce the resistance during sliding. That is, a cross section along the optical axis 20;
The cross section orthogonal to the optical axis 20 is formed in an arc shape. Thereby, the relative movement between the first lens barrel 13 and the second lens barrel 14 becomes smooth, and the rotational load of the rotating barrel 17 is reduced.

As shown in FIGS. 3 to 5, the second lens 12 is held by a second lens frame 33 movably provided along the optical axis 20 in the second lens barrel 14. The second lens frame 33 is movably provided in the second lens barrel 14 along the optical axis 20 by the feed screw 31 and the guide rod 32. A focus motor 34 is connected to the feed screw 31. By driving the focus motor 34, the second lens 12 moves in the optical axis direction according to the lead of the feed screw 31.

The movement of the second lens 12 is caused by the second movement.
The process is performed between the “origin position” closest to the image plane 10 a with respect to the lens barrel 14 and a position farther from the origin position toward the subject. At the time of zooming, the second lens 12 is located at the “origin position”.

FIG. 7 is a developed view showing the structure of the first lens cam groove 26 provided in the movable barrel 15.

The first lens cam pin 28 provided in the first lens barrel 13 is engaged with the first lens cam groove 26. The first lens cam groove 26 includes a first lens storage preparation guide section 42, a first lens movement prevention section 43, and a first lens variable power guide section 44.

The first lens housing preparation guide section 42 is a range in which the first lens cam pin 28 slides when the rotary cylinder 17 rotates in the rotation range from the “initial position” to the “rotation position A”. . The first lens storage preparation guide section 42 includes a “retreat position” in which the first lens barrel 13 is retracted toward the image plane with respect to the movable barrel 15 and a “storage preparation position” slightly projecting toward the subject. To move between. When the lens device 2 is in the retracted position, the first lens barrel 13 is located at the "retreat position".

The first lens movement preventing section 43 is provided with the rotating cylinder 17.
Is the range in which the first lens cam pin 28 slides when rotated in the rotation range from the “rotational position A” to the “intermediate position”. The first lens movement prevention unit 43
The first lens barrel 13 is formed along the direction around the optical axis of the movable barrel 15 so that the first lens barrel 13 does not move in the optical axis direction from the “storage preparation position” while allowing the rotation of the movable barrel 15. As a result, the first lens barrel 13 is maintained at the "storage preparation position" until the lens device 2 changes from the retracted position to the telephoto position.

The first lens variable power guide 44 is provided with the rotary cylinder 17.
Is the "magnification rotation range" from the "middle position" to the "end position"
This is the range in which the first lens cam pin 28 slides when rotated. The first lens variable power guide section 44 is shaped to move the first lens barrel 13 along the optical axis 20 in order to change the focal length.

It is to be noted that the first lens housing preparation guide section 42 described above is not always necessary, and the first lens housing preparation guide section 42 is omitted and the rotary cylinder 17 is omitted.
The entire rotation range of the movable barrel 15 according to the “storage rotation range” may be used as the first lens movement prevention unit 43.

FIG. 8 is an exploded view showing the configuration of the movable cylinder cam hole 24 and the second lens straight advance hole 23 provided in the fixed cylinder 16.

First, the configuration of the moving cylinder cam hole 24 will be described. A cam hole engaging portion 25A of a moving cylinder cam pin 25 provided on the moving cylinder 15 is engaged with the moving cylinder cam hole 24. The movable cylinder cam hole 24 includes a movable cylinder storage guide section 40 and a movable cylinder movement prevention section 41.

The movable cylinder storage guide section 40 is a range in which the movable cylinder cam pin 25 slides when the rotary cylinder 17 rotates in the “storage rotation range” from the “initial position” to the “intermediate position”. The movable cylinder storage guide section 40 has an optical axis between a “retreat position” in which the movable cylinder 15 is retracted toward the image forming surface 10a with respect to the fixed cylinder 16 and a “projection position” extended to the subject side. Move along 20. When the lens device 2 is in the retracted position, the movable barrel 15 is located at the "retreat position".

The moving cylinder movement preventing section 41 is a range in which the moving cylinder cam pin 25 slides when the rotating cylinder 17 rotates in the “magnification rotation range” from the “intermediate position” to the “end position”. . The movable cylinder movement preventing portion 41 is formed along the direction around the optical axis 20 so as to prevent the movable cylinder 15 from moving in the optical axis direction while allowing the movable cylinder 15 to rotate around the optical axis. ing. Thus, the moving barrel 15 is maintained at the “projected position” while the lens apparatus 2 is zoomed between the tele position and the wide position.

Next, the configuration of the second lens straight advance hole 23 will be described. A second lens cam pin 2 provided on the outer peripheral surface of the second lens barrel 14 is provided in the second lens straight advance hole 23.
The nine rectilinear hole engaging portions 54 are engaged. The second lens rectilinear hole 23 is formed along the optical axis 20, and the front end thereof is communicated with the moving cylinder movement preventing portion 41 of the moving cylinder cam hole 24.

By the way, the fixed cylinder 16 in which the second lens rectilinear hole 23 is formed is formed of an elastically deformable material such as plastic. When the second lens rectilinear hole 23 and the moving cylinder cam hole 24 are formed so as to communicate with each other with respect to the fixed cylinder 16 formed of such an elastically deformable material, the second lens rectilinear hole 23 It is formed to be able to expand and contract in the width direction.

The width A of the second lens rectilinear hole 23 formed so as to be freely expandable and contractible in the width direction is changed to the width B of the rectilinear hole engaging portion 54 of the second lens cam pin 29.
When formed slightly smaller than (see FIG. 11), the second lens rectilinear hole 23 acts so as to sandwich the rectilinear hole engaging portion 54 of the second lens cam pin 29 engaged at both edges from both sides. I do. As a result, there is no play between the engaged straight hole engaging portion 54 of the second lens cam pin 29 and the second lens straight hole 23, and the second lens barrel 14 can be accurately guided straight. Become like

On the other hand, as described above, the second lens rectilinear
Is formed so as to communicate with the moving cylinder cam hole 24, the cam hole engaging portion 25 </ b> A of the moving cylinder cam pin 25 engaged with the moving cylinder cam hole 24 slides through the moving cylinder movement preventing portion 41. Second
There is a risk of entering the lens rectilinear hole 23 or getting caught in the communicating portion.

Therefore, the moving cylinder cam pin 25 is configured as follows to prevent the moving cylinder cam pin 25 from getting into or catching in the second lens straight advance hole 23.

FIGS. 9 and 10 are a plan view and a side view showing the structure of the moving cylinder cam pin 25, respectively. As shown in the figure, the cam pin 25 for the movable cylinder is
A, a guide groove engaging portion 25B and a rectilinear groove engaging portion 25C.

The cam hole engaging portion 25A is formed in a columnar shape and engages with the moving tube cam hole 24 provided in the fixed tube 16.

The guide groove engaging portion 25B is
It is integrally formed on the top of 5A, and is formed in a trapezoidal plate shape. The guide groove engaging portion 25B is engaged with a guide groove 49 formed on the outer peripheral surface of the fixed cylinder 16. The guide groove 49 is formed along the edge of the cam hole 24 for the moving cylinder, and the guide groove engaging portion 25B is engaged with the guide groove 49 so that the cam pin 25 for the moving cylinder becomes the second lens. It is prevented from getting into or getting caught in the rectilinear operation hole 23. That is, since the width C of the guide groove engaging portion 25B in the direction around the optical axis is formed to be larger than the width A of the second lens rectilinear hole 23, the guide groove engaging portion 25B is obstructed. As a result, the moving cylinder cam pin 25 is prevented from entering or being caught in the second lens rectilinear hole 23.

The width D of the guide groove engaging portion 25B in the optical axis direction is formed to be larger than the width E of the cam hole 24 for the movable cylinder. Thereby, the cam pin 25 for the moving cylinder
From the moving cylinder cam hole 24 is prevented.

The rectilinear groove engaging portion 25C is
5B is integrally formed on the upper surface, and is formed in an elongated circular plate shape. The rectilinear groove engaging portion 25C is
7 and engages with the moving cylinder straight groove 22. In addition,
The operation of the rectilinear groove engaging portion 25C formed in an elongated circular shape will be described later in detail.

FIG. 11 is a front view showing the structure of the second lens cam pin 29 provided in the second lens barrel 14.
As shown in the drawing, the second lens cam pin 29 includes a rectilinear hole engaging portion 54 and a cam groove engaging portion 55.

The rectilinear hole engaging portion 54 is formed in a cylindrical shape, and the second lens rectilinear hole 23 formed in the fixed cylinder 16 is formed.
Engages.

On the other hand, the cam groove engaging portion 55 engages with the second lens cam groove 21 formed on the inner peripheral surface of the rotary cylinder 17,
It is composed of a storage engagement portion 55a and a variable power engagement portion 55b.

The housing engaging portion 55a is integrally formed coaxially with the top of the rectilinear hole engaging portion 54, and has a truncated conical cross section. The housing engagement portion 55a engages with the second lens housing guide portion 58 of the second lens cam groove 21. Note that the bottom surface of the storage engagement portion 55a is formed to have a diameter larger than the outer diameter of the second lens rectilinear hole 23, and the rectilinear hole engagement portion 54 engages with the second lens rectilinear hole 23. , Comes into contact with the outer peripheral surface of the fixed cylinder 16. Thus, the second lens cam pin 29 is prevented from coming out of the second lens straight advance hole 23.

On the other hand, the variable power engaging portion 55b is
5a are integrally formed on the top coaxially,
It is formed in a truncated conical cross section with a smaller diameter than 5a. The variable-magnification engaging portion 55b is provided in the second lens cam groove 21 in the second direction.
Lens power varying guide 56 and second lens direction changing guide 57
And engage.

FIG. 12 is an exploded view showing the configuration of the second lens cam groove 21 and the moving cylinder rectilinear groove 22 formed on the inner peripheral surface of the rotary cylinder 17.

First, the configuration of the second lens cam groove 21 will be described. A second lens cam pin 2 provided on the outer peripheral surface of the second lens barrel 14 is provided in the second lens cam groove 21.
Nine cam groove engaging portions 55 are engaged. The cam groove 21 for the second lens is used to change the focal length.
Lens variable-magnification guide section 5 for moving the lens along the optical axis 20
6 (magnification area), a second lens direction change guide 57 for changing the moving direction of the second lens 12, and a second lens storage guide 58 for moving the second lens 12 to the "storage position C".
(Storage area).

The second lens variable power guide 56 rotates the rotary barrel 17 toward the "end position" in the "variable rotation range" from the "intermediate position" to the "end position". It is a curved cam locus that guides the two-lens cylinder 14 so as to retreat toward the imaging surface 10a.

The second lens direction changing guide 57 is provided in the rotation range from the “rotational position B” to the “intermediate position”.
When the is rotated toward the “intermediate position”, the moving direction of the second lens barrel 14 changes, that is, the second lens barrel 14 that has moved toward the subject side changes direction. It is a curved trajectory that is guided so as to retreat toward the image forming surface 10a.

When the rotary barrel 17 is rotated toward the “rotational position B” in the rotation range from the “initial position” to the “rotational position B”, the second lens barrel Reference numeral 14 denotes a linear trajectory that guides the robot to extend toward the subject.

Here, as described above, the variable power engaging portion 55b of the cam groove engaging portion 55 is engaged with the second lens variable power guiding portion 56 and the second lens direction changing guiding portion 57. The storage engagement portion 55a is engaged with the second lens storage guide portion 58.

For this reason, the second lens variable power guide section 56
As shown in FIG. 13, first tapered surfaces 56a are formed on both side surfaces.
And the second tapered surface 56b are formed, and only the variable-magnification engaging portion 55b is formed so as to contact the second tapered surface 56b. (It does not contact the one taper surface 56a.)

More specifically, the second lens variable power guide unit 5
6, the second taper surface 56b is formed at the same inclination angle as the both side surfaces of the variable power engaging portion 55b of the cam groove engaging portion 55, and the width F of the lower end portion is the variable power engaging portion. Part 55
It is formed with the same width as the width G at the bottom of b. On the other hand, the first tapered surface 56a of the second lens variable power guiding portion 56
The inclination angle of the cam groove engaging portion 55
It is formed at the same inclination angle as the both side surfaces of “a”, but the width H of the lower end is formed to be larger than the width I of the bottom of the storage engagement portion 55a. Therefore, in the second lens variable power guide portion 56, only the variable power engagement portion 55b at the tip of the cam groove engagement portion 55 contacts the second tapered surface 56b (the storage engagement portion 55a and the first tapered surface 56b). A predetermined gap is formed between the first and second members 56a and 56a so that they do not contact each other.)

The second lens direction changing guide 57 has the same configuration as the second lens variable power guide 56. That is, the first tapered surface and the second tapered surface are formed on both side surfaces of the cam groove engaging portion 55, and only the variable-magnification engaging portion 55 b at the tip is formed on both sides of the second lens direction changing guide portion 57. (A predetermined gap is formed between the storage engaging portion 55a and both side surfaces of the second lens direction changing guide portion 57 so that they do not contact each other.)

On the other hand, the second lens housing and guiding portion 58 is
As shown in FIG. 4, the taper is formed on both side surfaces 58a, and the cam groove engaging portion 55 is formed such that only both side surfaces of the storage engaging portion 55a abut on the both side surfaces 58a (see FIG. 4). (It does not come into contact with both side surfaces 58a of the variable magnification engaging portion 55b.) More specifically, both side surfaces 58a of the second lens storage guide portion 58 are formed at the same inclination angles as the both side surfaces of the storage engagement portion 55a of the cam groove engagement portion 55, and the opening angle thereof is formed. The width J of the portion is formed to be the same as the width I of the bottom of the storage engagement portion 55a. Therefore, this second
In the lens storage guide portion 58, only the storage engagement portion 55a at the base end of the cam groove engagement portion 55 is the second lens storage guide portion 58.
(A predetermined gap is formed between the variable-magnification engaging portion 55b and the both side surfaces 58a of the second lens housing guide portion 58 so that they do not abut each other).

According to the second lens cam groove 21 configured as described above, when the rotary cylinder 17 is rotated from the “initial position” to the “rotation position B”, the cam groove of the second lens cam pin 29 is formed. The engaging portion 55 slides on the second lens housing guide portion 58 to extend the second lens barrel 14 toward the subject. At this time, the cam groove engaging portion 55 is
a comes into contact with and slides on both side surfaces 58a of the second lens storage guide portion 58 (the variable-magnification engagement portion 55b does not come into contact).

When the rotary cylinder 17 is rotated from the “rotational position B” to the “intermediate position”, the cam groove engaging portion 55 of the second lens cam pin 29 causes the second lens direction change guide portion 57 to move. By sliding, the moving direction of the second lens barrel 14 is changed. That is, the second lens barrel 14 is moved from the subject side toward the image plane 10a. At this time, the cam groove engaging portion 55 slides while its variable-magnification engaging portion 55b abuts on the second lens direction change guide portion 57 (the housing engaging portion 55a does not abut).

Further, when the rotary cylinder 17 is rotated from the “intermediate position” to the “end position”, the cam groove engaging portion 55 of the second lens cam pin 29 slides the second lens variable power guiding portion 56. Then, the second lens barrel 14 is moved in a direction in which the second lens barrel 14 is retracted toward the imaging surface 10a. At this time, the cam groove engaging portion 55 slides when its variable-magnification engaging portion 55b abuts on the second tapered surface 56b of the second lens variable-magnification guide portion 56 (the storage engaging portion 55a abuts). Zu.).

As described above, the cam groove engaging portion 55 of the second lens cam pin 29 has a two-stage structure, and the second lens cam groove 21 has a two-stage structure. The contact portion between the portion 56 and the second lens storage guide portion 58 can be changed, and as a result, abrasion of the cam pin can be effectively suppressed.

The second lens variable power guide 56 needs to operate the second lens barrel 14 accurately at the time of photographing. Since the guide unit 58 does not affect the photographing, it is not required to be as accurate as the second lens variable power guide unit 56. Therefore, by forming the cam groove engaging portion 55 and the second lens cam groove 21 in a two-stage structure as described above,
Only the second lens variable power guide 56 needs to be manufactured with high precision (the second lens housing guide 58 can be manufactured roughly), which improves productivity and reduces manufacturing cost.

Further, the movement trajectory of the cam groove engaging portion 55 in the second lens direction changing guide portion 57 has a curved shape convex toward the subject side. At this time, as shown in FIG. Since the portion 55b is formed to have a smaller diameter than the storage engagement portion 55a, the curvature radius _{Rb of the} movement trajectory that passes through the image formation surface side of the movement trajectory is the same as that of the storage engagement portion 55a. of greater than the radius of curvature R _a of the movement locus most through the imaging surface side. As described above, in the second lens direction changing guide portion 57 that changes the moving direction of the second lens barrel 14, the variable power engaging portion 55b having a large radius of curvature is engaged.
The lens barrel 14 can be moved smoothly.

Next, the structure of the moving cylinder straight advance groove 22 will be described. The rectilinear groove engaging portion 25C of the moving cylinder cam pin 25 is engaged with the moving cylinder rectilinear groove 22. As shown in FIG. 12, the moving cylinder rectilinear groove 22 is formed along the optical axis 20 and intersects with the second lens variable power guide portion 56 of the second lens cam groove 21.

As shown in FIG. 15, the depth K of the rectilinear groove 22 for the movable cylinder is smaller than the depth L of the cam groove 21 for the second lens. Thus, the cam groove engaging portion 55 of the second lens cam pin 29 that slides on the second lens variable power guide portion 56 of the second lens cam groove 21 is prevented from entering the moving cylinder straight advance groove 22. You.

On the other hand, as described above, the moving cylinder straight groove 2
2 of the moving cylinder cam pin 25 engaging with the linear groove engaging portion 25
C is formed in an elongated circular plate shape. The length M of the rectilinear groove engaging portion 25C is formed to be longer than the length N of the intersection between the moving cylinder rectilinear groove 22 and the second lens cam groove 21. This prevents the rectilinear groove engaging portion 25C of the moving cylinder cam pin 25 that slides in the moving cylinder rectilinear groove 22 from entering the second lens cam groove 21 or being caught in the intersection.

The operation of the lens device 2 according to the present embodiment having the above-described structure is as follows.

First, when the rotating barrel 17 is rotated, the moving barrel 15, the first lens barrel 13, and the second lens barrel 1
4 will be described.

When the lens device 2 is in the retracted position, as shown in FIG. 3, the moving barrel 15 and the first lens barrel 13
Each is accommodated in the fixed cylinder 16.

By driving the zoom motor 19, the rotary cylinder 17
Is rotated from the “initial position” to the “end position”, the rotation of the rotary barrel 17 is transmitted to the movable barrel cam pin 25 via the movable barrel straight advance groove 22. Thereby, the movable barrel 15 rotates in conjunction with the rotating barrel 17.

Here, the movable cylinder 15 has a movable cylinder cam pin 25 provided on the outer peripheral portion thereof and a movable cylinder straight groove 22 formed in the rotary cylinder 17 and a movable cylinder cam pin 25 formed in the fixed cylinder 16. Since it is engaged with the cam hole 24, when it rotates,
It moves in the optical axis direction while rotating with respect to the fixed barrel 16.

On the other hand, in the first lens barrel 13, the first lens cam pin 28 provided on the outer peripheral portion is engaged with the first lens cam groove 26 formed in the movable barrel 15, and The linear guide groove 27 formed on the peripheral surface is
When the movable barrel 15 rotates, the movable barrel 1 is engaged with the linear guide protrusion 30 formed on the lens barrel 14.
6 moves straight along the optical axis 20.

The second lens barrel 14 has a second lens cam pin 29 provided on the outer peripheral portion thereof, and a second lens cam groove 21 formed on the inner peripheral surface of the rotary barrel 17 and the fixed barrel 16. When the rotary barrel 17 rotates, it moves linearly along the optical axis 20 in conjunction with the rotation of the rotary barrel 17.

Next, when the rotary barrel 17 is rotated, the first lens barrel 13, the second lens barrel 14, and the movable barrel 1
The movement locus such as 5 will be described.

FIG. 16 is an explanatory diagram showing the movement trajectories of the first lens barrel 13, the second lens barrel 14, the movable barrel 15, and the like.

[0094] In the figure, the thick line (E) indicates the first line.
The movement trajectory of the lens barrel 13 is shown.
The movement locus of the second lens barrel 14 is shown. Further, a thin line (G) represents a movement locus of the first lens barrel 13 with respect to the moving barrel 15, and a thin line (J) represents a movement locus of the moving barrel 15.

As shown in the figure, when the lens device 2 is in the retracted position, the movable barrel 15 is located at the "retreat position K". Further, the second lens barrel 14 is located at the “storage position C” closest to the image plane, and the first lens barrel 13 is
The first lens barrel 13 is located at the “retreat position H” with respect to the moving barrel 15 (the first barrel 13 is located at the “retracted position D”) which is close to the lens barrel 14.

First, the first lens barrel 13 when the rotary barrel 17 rotates from the “initial position” to the “intermediate position”
And the movement locus of the moving cylinder 15 will be described.

During the rotation of the rotary barrel 17 from the “initial position” to the “rotational position A”, the first lens barrel 13 has the first lens cam pin 28 provided on the outer peripheral portion thereof and the first lens cam groove. Slide the first lens storage preparation guide section 42 of FIG. As a result, the first lens barrel 13 moves with respect to the movable barrel 15 in the “retreat position H” of the movement trajectory represented by the thin line (G).
To the "storage preparation position I".

While the rotary barrel 17 rotates from the “rotational position A” to the “intermediate position”, the first lens barrel 13 is provided with the first lens cam pin 28 provided on the outer peripheral portion thereof. The first lens movement preventing portion 43 of the cam groove 26 slides. As a result, the first lens barrel 13 is moved
Is prevented from moving in the optical axis direction. Accordingly, since the first lens barrel 13 does not move in the optical axis direction with respect to the movable barrel 15 during this time, the first lens barrel 13 moves to the “storage preparation position I” of the movement locus indicated by the thin line (G) with respect to the movable barrel 15. Will be maintained.

On the other hand, while the rotating barrel 17 rotates from the “initial position” to the “intermediate position”, the moving barrel cam pin 25 provided on the outer peripheral portion thereof
4 slides the movable cylinder storage guide section 40. Thereby, the moving cylinder 15 is extended from the “retreat position K” to the “projection position L” in the movement locus represented by the thin line (J).

Here, the first lens barrel 13 is supported by a moving barrel 15. Therefore, while the rotating barrel 17 rotates from the “initial position” to the “intermediate position”, the first lens barrel 13 moves the moving barrel 15 and the moving barrel 15.
Move along the optical axis 20 by the amount of the extension of the first lens barrel 13 with respect to. That is, the first lens barrel 13 moves the rotating barrel 17 from the “initial position” to the “rotating position A”.
Is rotated from the “storage position D” to the “position M” in the movement locus represented by the bold line (E).
When 7 rotates from “rotational position A” to “intermediate position”,
The movement trajectory represented by the bold line (E) is moved from the “position M” to the “position O”.

Next, when the rotary barrel 17 rotates from the “initial position” to the “intermediate position”, the second lens barrel 14
Will be described.

During the rotation of the rotary barrel 17 from the “initial position” to the “rotational position B”, the second lens barrel 14 has the second lens cam pin 29 provided on the outer peripheral portion thereof and the second lens cam groove. Then, the second lens storage guide portion 58 is slid. At this time, the second lens cam pin 29 slides with the storage engagement portion 55a of the cam groove engagement portion 55 engaged with the second lens storage guide portion 58. As a result, the second lens barrel 14 is extended from the “retreat position C” to the “position P” in the movement locus represented by the thick line (F).

While the rotary barrel 17 rotates from the “rotational position B” to the “intermediate position”, the second lens barrel 14 is provided with the second lens cam pin 29 provided on the outer peripheral portion thereof. Second lens direction changing guide portion 57 of cam groove 21
Slide. At this time, the second lens cam pin 29 is disengaged from the storage engagement portion 55a of the cam groove engagement portion 55, and the variable magnification engagement portion 55b is moved to the second lens direction change guide portion 57.
And slide. Thereby, the second lens barrel 14
Is fed from the “position P” of the movement trajectory represented by the thick line (F) to the “position N”.

Here, the second lens direction changing guide 5
7 is formed to have a smaller diameter than the storage engagement portion 55a engaged with the second lens storage guide portion 58, so that the radius of curvature of the movement locus (movement locus) Is the radius of curvature of the movement trajectory that passes through the imaging surface side
The radius of curvature of the movement locus of the storage engagement portion 55a (the radius of curvature of the movement locus that passes through the image forming surface side of the movement locus) is larger. As described above, the second lens cam pin 29 is provided in the second lens direction changing guide portion 57 for changing the moving direction of the second lens barrel 14 in the variable power engaging portion 5 having a large radius of curvature.
The second lens barrel 14 can be moved smoothly since the second lens barrel 14 is slid by engagement. In addition, the rotational load of the rotary cylinder 17 can be reduced.

As described above, the rotating cylinder 17 is in the "middle position".
As shown in FIG. 4, the lens device 2 is in the telephoto position. In this state, the moving cylinder 15 is located at the “projecting position L”. Then, the first lens barrel 13
Is located at “position O”, and the second lens barrel 14 is positioned at “position N”.
Located in.

After the lens device 2 is in the telephoto position, the rotary cylinder 17 is rotated in the "variable rotation range".

While the rotating barrel 17 is rotating in the “magnification rotation range”, the moving barrel cam pin 25 provided on the outer periphery of the movable barrel 15 is moved by the movable barrel cam hole 24 so as to prevent the movable barrel movement hole 41 from moving. Slide. For this reason, the movable barrel 15 is
Is prevented from moving in the optical axis direction. Therefore, since the moving cylinder 15 does not move in the optical axis direction during this time, it is maintained at the “projecting position L” of the moving locus indicated by the thin line (J).

The first lens barrel 13 has a first lens barrel cam pin 28 provided on the outer peripheral portion thereof while the rotary barrel 17 rotates in the “magnification rotation range”.
The first lens variable power guide 44 is slid. For this reason, the first lens barrel 13 moves the optical axis 20 with respect to the movable barrel 15 by an amount corresponding to the displacement of the first lens variable power guide 44 in the optical axis direction.
Move along.

While the rotary barrel 17 rotates in the "magnification rotation range", the second lens cam pin 29 provided on the outer peripheral portion of the second lens barrel 14
The second lens variable power guide 56 is slid. For this reason, the second lens barrel 14 is moved according to the displacement of the second lens variable power guide 56 in the optical axis direction. At this time, the second lens cam pin 29 slides with the variable power engaging portion 55b of the cam groove engaging portion 55 engaging with the second lens variable power guiding portion 56.

At the time of zooming, the first lens barrel 13 and the second lens barrel 14 are moved along the optical axis 20 so that their intervals are different. During this time, the second lens barrel 14
By the urging of the spring 37 in the optical axis direction, the play between the second lens cam pin 29 and the second lens cam groove 21 is absorbed, and the inclination with respect to the fixed barrel 16 is also corrected.
On the other hand, in the first lens barrel 13, since the inside of the rectilinear guide groove 27 is pressed in the radial direction by the rectilinear guide protrusion 30,
The inclination of the optical axis of the first lens 11 with respect to the optical axis of the second lens 12 during zooming is suppressed as much as possible.

At this time, the radial urging by the rectilinear guide projection 30 is one irrespective of the moving position of the second lens barrel 14. Therefore, the first lens barrel 13 and the second lens barrel 14 can always be moved smoothly.

Since the straight guide projection 30 has a spherical end surface 30c, the straight guide groove 27 is formed.
At a point with the bottom of the Thereby, the resistance at the time of sliding can be reduced as much as possible.

The operation of the lens device 2 according to the present embodiment is as described above. By the way, in the lens device 2 of the present embodiment, the cam groove 21 for the second lens formed on the inner peripheral surface of the rotary cylinder 17 and the straight groove 22 for the movable cylinder intersect. As described above, by forming the second lens cam groove 21 and the moving cylinder rectilinear groove 22 so as to intersect with each other, the inclination of the second lens cam groove 21 can be set gently. The two-lens tube 14 can be operated stably.

That is, conventionally, the second lens cam groove 2
1 and the moving cylinder rectilinear groove 22 were formed so as not to intersect with each other, so that the inclination of the second lens cam groove 21 had to be set steeply. However, as in the present embodiment, the second lens cam groove 21 was inevitably set. By forming the cam groove 21 for the moving cylinder and the rectilinear groove 22 for the moving cylinder so as to intersect, the inclination of the cam groove 21 for the second lens can be set freely regardless of the presence or absence of the rectilinear groove 22 for the moving cylinder. Become like Thereby, the second lens barrel 14
Can be operated stably. Also, the rotating cylinder 17
Can also be reduced.

Further, as described above, the second lens cam groove 21 is formed.
Can be set freely, so that the rotation cylinder 17 can be made as small as possible while ensuring stable operation of the second lens barrel 14.

On the other hand, when the cam groove 21 for the second lens and the rectilinear groove 22 for the moving cylinder are formed to cross each other as in this embodiment, the second lens cam groove 21 engaging with the second lens cam groove 21 is formed. The cam pin 29 is inserted into the rectilinear groove 22 for the moving cylinder, or the cam pin 2 for the moving cylinder engaged with the rectilinear groove 22 for the moving cylinder.
5 may enter the second lens cam groove 21, but by forming the depth L of the second lens cam groove 21 to be greater than the depth K of the moving cylinder rectilinear groove 22, the second lens Cam pin 29 can be prevented from entering the moving cylinder rectilinear groove 22. In order to prevent the movable cylinder cam pin 25 from entering the second lens cam groove 21, the straight groove engaging portion 25 </ b> C of the movable cylinder cam pin 25 that engages with the movable cylinder straight groove 22 is formed into an elongated circle. This can be prevented by adopting a shape (a circular shape longer than the length N of the intersection).

In the present embodiment, the cam groove 21 for the second lens and the rectilinear groove 22 for the movable cylinder are respectively
Is formed at three divided positions around
Second lens cam groove 21, moving cylinder rectilinear groove 22, optical axis 2
When formed at three divided positions around 0, the three second lens cam pins 29 and the moving cylinder cam pins 25 are simultaneously moved to the second lens cam groove 21 and the moving cylinder straight groove 22, respectively.
You will pass through the intersection with. In this case, there is a possibility that each cam pin may be caught at the intersection between the second lens cam groove 21 and the moving cylinder rectilinear groove 22 to cause malfunction.

Therefore, one or both of the second lens cam groove 21 and the moving cylinder straight-moving groove 22 are formed at irregular intervals around the optical axis, so that each second lens cam pin 29 and each moving cylinder cam pin are formed. 25 shift the timing of passing through the intersection. Thus, it is possible to effectively prevent the three cam pins from passing through the intersection at the same time and causing the intersection to be caught.

For example, as shown in FIG. 17, the cam grooves 21 for the second lens are formed at equal intervals of 120 ° -120 ° -120 °, and the straight grooves 22 for the moving cylinder are formed at 117 ° -117 °.
Formed at unequal intervals of -126 °. With this configuration, as shown in FIG. 18, the position of each intersection is shifted by γ in the optical axis direction, and the timing at which each of the second lens cam pins 29 and each of the movable barrel cam pins 25 pass through the intersection. Can be shifted. Thereby, the second lens barrel 14 and the movable barrel 15 can be smoothly moved without causing a malfunction.

In the above example, the moving cylinder straight groove 22 is used.
Are formed at unequal intervals of 117 ° -117 ° -126 °.
The second lens cam grooves 21 are formed at equal intervals of 20 °.
The same effect can be obtained even if they are formed at unequal intervals of 17 ° -117 ° -126 °. Further, both may be formed at irregular intervals.

Also, in the case of forming at irregular intervals, instead of forming at 117 ° -117 ° -126 ° as in the above example, for example, 115 ° -115 ° -130 °
May be formed. That is, it is sufficient that the interval is such that each cam pin does not pass through the intersection at the same time, and the optimum value is appropriately selected and formed according to the diameter of the cylindrical body forming the groove, the width of the groove, and the like.

Further, the formation of the cam grooves at irregular intervals can be applied to the case where the cam grooves cross each other, and the same effect can be obtained. That is, the timing at which the cam pins engaging with the respective cam grooves pass through the intersections can be shifted, and malfunctions can be effectively prevented.

In the above example, each second lens cam groove 21 or each moving cylinder rectilinear groove 22 is formed so as to be shifted in the direction around the optical axis, so that each second lens cam pin 2 is formed.
The timing at which the cam pins 9 and the moving cylinder cam pins 25 pass through the intersections is shifted. However, by forming the second lens cam grooves 21 or the moving cylinder rectilinear grooves 22 so as to be shifted in the optical axis direction. The timing at which each of the second lens cam pins 29 and each of the movable barrel cam pins 25 pass through the intersection can be shifted.

For example, as shown in FIG. 18, each second lens cam groove 21 is formed so as to be shifted in the optical axis direction δ. Thus, the position of each intersection is shifted in the optical axis direction, and the timing at which each of the second lens cam pins 29 and each of the movable barrel cam pins 25 pass through the intersection can be shifted.

By shifting the cam pins in the direction of the optical axis as described above, shifting the timing at which the cam pins pass through the intersection can be applied to the case where the cam grooves intersect. Similar effects can be obtained.

In the case where each of the second lens cam grooves 21 or each of the moving cylinder rectilinear grooves 22 is formed so as to be shifted in the optical axis direction,
Although the length of the rotary cylinder 17 becomes longer, when the cam grooves 21 for the second lenses or the rectilinear grooves 22 for the movable cylinders are formed to be shifted in the direction around the optical axis, there is no such a problem, and the lens The device 2 can also be made compact.

Further, in this embodiment, the moving cylinder straight advance groove 22 is made to intersect with the second lens variable power guiding portion 56 (power variable area) of the second lens cam groove 21.
The lenses may intersect at the lens storage guide 58 (storage area). As described above, by intersecting the moving cylinder straight-moving grooves 22 with the second lens housing guide portion 58, even if the cam pins are caught on the intersections,
Does not affect shooting. This also allows the second lens barrel 14 to operate smoothly during the magnification operation.

As described above, it is possible to freely select the intersection position between the moving cylinder straight advance groove 22 and the second lens cam groove 21, and the cam grooves intersect with the inner peripheral surface of the rotary cylinder 17. The degree of freedom in design is improved as compared with the case of forming by forming.

That is, when the cam grooves intersect with each other, the cam pins passing through each cam groove are prevented from being guided to the other cam groove at the intersection, so that the cam grooves intersect at a certain angle. In this case, the degree of freedom in design is reduced. The intersection of the cam groove selected in this manner does not always coincide with the optimal intersection of the cam groove that is optimal for minimizing the diameter of the lens barrel. There is a limit in making the lens barrel smaller by crossing each other.

On the other hand, since the rectilinear grooves are formed parallel to the optical axis, they can be freely designed without any influence on the diameter of the cylindrical body, regardless of the position where they cross the cam grooves. And as a result of being able to freely select the intersection position in this way, the cam groove and the rectilinear groove can be made to intersect at the position where the intersection angle is the largest, and as a result, it is possible to secure As far as possible, the diameter of the cylindrical body can be reduced.

In this embodiment, the straight groove engaging portion 2 of the moving cylinder cam pin 25 which engages with the moving cylinder straight groove 22 is provided.
5C is formed in an elongated circular shape.
The shape of 5C is not limited to this shape, but may be any shape that is longer than the width at the intersection of the second lens cam grooves 21.

By setting the length of the cam pin engaging with one groove to be longer than the width at the intersection of the other groove, the cam pin engaging with one groove can be
Preventing entry into the other groove can also be applied to the case where the cam grooves cross each other. That is,
When the cam grooves cross each other, the length of the cam pin engaged with one cam groove is formed longer than the width at the intersection of the other cam groove. Accordingly, it is possible to prevent a cam pin engaged with one cam groove from entering the other cam groove. Thus, even when the crossing angle is small, the cam pins that engage with one of the cam grooves
Since it can be prevented from entering the other cam groove, the size of the lens barrel can be reduced.

In the present embodiment, the present invention is applied to a lens device in which the second lens cam groove 21 and the moving cylinder rectilinear groove 22 are formed three each around the optical axis. As described above, the present invention can be similarly applied to a lens device in which two or more cam grooves and straight movement grooves are formed around the optical axis.

In the present 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.

The present invention can be applied not only to a zoom lens camera but also to a bifocal camera that switches between a telephoto position, a wide position, and a retracted position, for example.
The present invention can be applied not only to an electronic still camera but also to a silver halide camera.

[0136]

As described above, according to the present invention,
The cam groove and the rectilinear groove cross each other and are formed on the inner peripheral surface of the cylindrical body. Accordingly, the inclination of the cam groove can be set freely irrespective of the rectilinear groove, so that each cylinder can be operated stably and the lens device can be made as small as possible. That is, since the rectilinear groove is formed parallel to the optical axis, the crossing of the cam groove at any position does not affect the diameter of the cylindrical body. Thus, the cam groove and the straight groove can intersect at a position where the intersection angle is the largest. As a result, the diameter of the cylinder can be reduced as much as possible while ensuring stable operation of the cylinder.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external configuration of an electronic still camera.

FIG. 2 is an exploded perspective view of the lens device.

FIG. 3 is a sectional view showing the lens device in a retracted position.

FIG. 4 is a sectional view showing the lens device in a telephoto position;

FIG. 5 is a sectional view showing the lens device in a wide position.

FIG. 6 is a cross-sectional view of the first lens barrel and the second lens barrel cut in a direction orthogonal to the optical axis.

FIG. 7 is a developed view showing a configuration of a first lens cam groove provided in the movable barrel.

FIG. 8 is a developed view showing a configuration of a movable cylinder cam hole and a second lens straight-moving hole provided in a fixed cylinder.

FIG. 9 is a plan view showing the configuration of a moving cylinder cam pin.

FIG. 10 is a side view showing a configuration of a cam pin for the moving cylinder.

FIG. 11 is a front view showing a configuration of a second lens cam pin.

FIG. 12 is an exploded view showing the configuration of a second lens cam groove and a moving cylinder rectilinear groove formed on the inner peripheral surface of the rotary cylinder.

FIG. 13 is a sectional view showing an engagement state between a second lens cam groove and a second lens cam pin.

FIG. 14 is a sectional view showing an engagement state between a second lens cam groove and a second lens cam pin.

FIG. 15 is a cross-sectional view showing a configuration of an intersection between a second lens cam groove and a moving cylinder straight groove.

FIG. 16 is an explanatory diagram showing the movement trajectories of the first lens barrel, the second lens barrel, the moving barrel, and the like.

FIG. 17 is a sectional view showing the configuration of another embodiment of a cam groove for a second lens and a rectilinear groove for a moving cylinder formed on the inner peripheral surface of a rotating cylinder.

FIG. 18 is a developed view showing a configuration of another embodiment of the second lens cam groove and the moving cylinder straight groove formed on the inner peripheral surface of the rotary cylinder.

FIG. 19 is an exploded view showing the configuration of another embodiment of the second lens cam groove and the moving cylinder rectilinear groove formed on the inner peripheral surface of the rotary cylinder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electronic still camera, 2 ... Lens device, 10a ... Image forming surface, 11 ... 1st lens, 12 ... 2nd lens, 13 ... 1st
Lens barrel, 14 ... second lens barrel, 15 ... moving barrel, 16 ...
Fixed cylinder, 17: rotating cylinder, 20: optical axis, 21: cam groove for second lens, 22: rectilinear groove for moving cylinder, 23: rectilinear hole for second lens, 24: cam hole for moving cylinder, 25: moving Cam pin for cylinder, 25A: cam hole engaging portion, 25B: guide groove engaging portion,
25C: straight groove engaging portion, 26: first lens cam groove, 2
7: straight guide groove, 28: cam pin for first lens, 29
... Cam pin for second lens, 30 ... Protrusion guide projection, 33
... second lens frame, 34 focus motor, 37 ... spring, 38 ... arm, 40 ... moving cylinder storage guide section, 41 ... moving cylinder movement prevention section, 42 ... first lens storage preparation guide section, 4
Reference numeral 3 denotes a first lens movement preventing portion, 44 denotes a first lens variable power guiding portion, 49 denotes a guide groove, 54 denotes a straight hole engaging portion, 55 denotes a cam groove engaging portion, 55a denotes a housing engaging portion, and 55b denotes a variable. Double engagement part,
56: second lens variable power guide, 56a: first tapered surface,
56b: a second tapered surface, 58: a second lens storage guide,
58a: Both side surfaces of the second lens storage guide portion

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[Procedure amendment]

[Submission date] March 8, 2000 (200.3.8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG.

FIG. 4

FIG. 5

FIG. 9

FIG.

FIG. 6

FIG. 7

FIG. 10

FIG. 13

FIG. 8

FIG. 11

FIG.

FIG. 14

FIG.

FIG. 16

FIG.

Continuation of the front page (72) Inventor Masaaki Orimoto 3-11-46 Izumi, Asaka-shi, Saitama F-term in Fujisha Shin Film Co., Ltd. (Reference) 2H044 BD08 BD09 BD10 BD14 EA03 EA08 2H101 BB07 BB10 DD07 DD11 DD15 DD44 DD62

Claims (6)

[Claims] 1. A lens device in which a straight groove and a cam groove are formed on an inner peripheral surface of a cylindrical body, wherein the straight groove and the cam groove are formed to intersect. 2. The lens device according to claim 1, wherein the rectilinear groove and the cam groove are formed at different depths from each other. 3. The cam groove includes a variable magnification area for performing a magnification operation on a lens barrel engaged via a cam pin and a storage area for performing a storage operation, and it is determined that the rectilinear grooves intersect in the storage area. The lens device according to claim 1 or 2, wherein 4. A lens device in which a plurality of first grooves are formed at predetermined intervals on an inner peripheral surface of a cylindrical body and a plurality of second grooves are formed at predetermined intervals. By forming the second grooves at unequal intervals in the circumferential direction, the first grooves and the second grooves are formed so as to intersect with each other, and the respective intersection positions are shifted along the photographing optical axis. Lens device. 5. A lens device in which a plurality of first grooves and a plurality of second grooves are formed on an inner peripheral surface of a cylindrical body, wherein a position at which each of the first grooves or each of the second grooves is formed is determined by a photographing optical axis. The first groove and the second groove are formed so as to intersect with each other by being formed so as to be shifted along with each other, and the respective crossing positions are shifted along the photographing optical axis. 6. A lens device in which a first groove and a second groove are formed on an inner peripheral surface of a cylindrical body, wherein the first groove and the second groove are formed so as to intersect with each other and the first groove is formed. A lens device, wherein a length of a cam pin engaged with the groove is formed to be longer than a width of the second groove at the intersection.