JP2002189166A - Lens barrel, camera and optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel which can be made small in size and light in weight. SOLUTION: This lens barrel is provided with a cylindrical cam that is arranged on the outer periphery of a fixed barrel and that cam-drives a 1st lens group in an optical axis direction by rotation when receiving driving force from a 1st driving source, and a transmission shaft member for transmitting driving force from a 2nd driving source to a moving mechanism for moving a 2nd lens group in the optical axis direction. The transmission shaft member is disposed to pierce through the inner periphery of the cylindrical cam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel which can be reduced in size and weight, and a camera and an optical apparatus having the lens barrel.

[0002]

2. Description of the Related Art A lens barrel in which a lens holding frame is cam-engaged with a cylindrical cam barrel having a cam groove formed on an outer periphery, and the lens barrel is driven in the optical axis direction by driving the cam barrel, includes: There is a lens driving device proposed in Japanese Patent Application Laid-Open No. 9-145881. FIG. 5 is a sectional view of the lens driving device.

A guide bar 52 extending in the optical axis direction penetrates a lens holding frame 51 for holding a lens group.
With the guide bar 52 preventing the lens holding frame 51 from falling with respect to the optical axis, the lens holding frame 51 is fixed to the fixed cylinder 5.
3 is held. Here, the guide bar 52 is disposed in a position opposite to the fixed cylinder 53 with the optical axis interposed therebetween.

On the outer periphery of the lens holding frame 51, a projection 5 is provided.
8 are formed, and a tip of the projection 58 is provided with a roller 59.
Is provided. The roller 59 is engaged with a cam groove 57 formed on the outer periphery of the cylindrical cam 56. Cylindrical cam 5
A gear 55a is provided at one end of the rotation shaft of No. 6,
The gear 55a meshes with a gear 55b provided on the motor 54.

In the above-described configuration, the rotational force of the motor 54 is transmitted to the cylindrical cam 56 via the gear 55b and the gear 55a to rotate the cylindrical cam 56. When the cylindrical cam 56 rotates, the roller 59 provided on the lens holding frame 51 is guided by the cam groove 57 of the cylindrical cam 56 and moves in the optical axis direction. Thereby, the lens holding frame 51
Moves in the optical axis direction to move the lens group in the optical axis direction.

In a lens driving device used in a video camera or the like, a lens holding frame for holding a lens group of a focusing system is helicoidally engaged with a fixed cylinder, and the lens holding frame is rotated about an optical axis. The focal point is adjusted by moving the optical axis in the optical axis direction.

[0007]

However, among the above-described lens driving devices, in a lens driving device having a structure in which the focusing lens group does not move during zooming, the focusing lens group is moved in the optical axis direction. In order to perform focusing, a transmission mechanism for transmitting a driving force from a driving source such as a motor to a lens group of a focusing system must be individually provided at a position other than the position where the cylindrical cam is disposed.

As described above, if the transmission mechanism is arranged at a place other than the place where the cylindrical cam is arranged, the lens barrel becomes larger by the arrangement of the transmission mechanism and the weight increases.

Accordingly, an object of the present invention is to provide a lens barrel which can be reduced in size and weight.

[0010]

In order to achieve the above object, the present invention is directed to a first lens group which is disposed on the outer periphery of a fixed cylinder and rotates by receiving a driving force from a first driving source. And a transmission shaft member for transmitting a driving force from a second driving source to a moving mechanism for moving the second lens group in the optical axis direction. The transmission shaft member is disposed so as to penetrate the inner periphery of the cylindrical cam.

In other words, by disposing the transmission shaft member for transmitting the driving force from the second drive source to the moving mechanism inside the cylindrical cam, it is not necessary to dispose the transmission shaft member outside the cylindrical cam. Therefore, the size of the lens barrel can be reduced. Further, by penetrating the transmission shaft member inside the cylindrical cam, it is possible to suppress an increase in the weight of the lens barrel as compared with a case where the transmission shaft member is arranged outside the cylindrical cam.

Here, a bearing portion for rotatably holding the cylindrical cam and the transmission shaft member may be formed on the outer periphery of the fixed cylinder. Thus, the cylindrical cam and the transmission shaft member disposed inside the cylindrical cam can rotate without interfering with each other. Further, a first operation member for transmitting a user operation force to the cam cylinder and a second operation member for transmitting a user operation force to the transmission shaft member may be provided. Thus, the first lens group and the second lens group can be moved in the optical axis direction by the user's operation, and fine adjustment of the lens groups can be performed.

The first lens group may be a zoom lens group, and the second lens group may be a focus lens group. Further, the lens barrel of the present invention can be used for optical devices such as cameras and projectors.

[0014]

(First Embodiment) FIG. 1 shows a sectional view (A) and a front view (B) of a lens barrel according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view of the lens barrel according to the present embodiment.

Reference numeral 1 denotes a focus ring that is operated to perform focus adjustment, and is rotatable around the optical axis. A gear portion is formed at the rear end of the focus ring 1 and meshes with a focus gear 11 described later. The focus ring 1 is fixed to a first lens barrel 2 described later with screws.

Reference numeral 2 denotes a first-group lens barrel for holding a first lens group (a second lens group according to the present invention). A helicoid portion is formed on the outer periphery of the first lens barrel 1, and is engaged with a helicoid portion formed on the inner periphery of the fixed barrel 8.
Note that the first lens group is a lens group of a focus system, and the first lens group moves in the optical axis direction.
Focusing is performed.

Reference numeral 3 denotes a second lens barrel for holding the second lens group. A cam follower portion 3a having a convex shape and three sleeve portions 3b formed in an L shape are formed in the circumferential direction of the second group lens barrel 3. The cam follower portion 3a is provided with a straight groove 8d extending in the optical axis direction in a fixed cylinder 8 described later.
And engages with a cam groove formed in the cylindrical cam 9 described later. Further, the sleeve portion 3b is formed at a position facing the circumferential direction of the second lens barrel 3 with the optical axis interposed therebetween, and the sleeve portion 3b is connected to a guide bar 8c formed inside the fixed tube 8 described later. Engage.

Reference numeral 4 denotes a third lens barrel for holding the third lens group. In the circumferential direction of the third lens barrel 4, similarly to the second lens barrel 3, a convex cam follower portion 4a and an L-shape are provided. Three sleeve portions 4b formed in a shape are formed. The cam follower portion 4 a penetrates the straight groove 8 d of the fixed cylinder 8 and engages with the cam groove of the cylindrical cam 9. Also, the sleeve part 4b
The third group lens barrel 4 is formed at a position facing the outer circumference of the optical axis with the optical axis interposed therebetween, and is engaged with the guide bar 8 c of the fixed barrel 8.

Reference numeral 5 denotes a fourth lens barrel for holding the fourth lens group. In the circumferential direction of the fourth lens barrel 5, similarly to the second lens barrel 3, a convex cam follower portion 5a and an L-shape are provided. Three sleeve portions 5b formed in a shape are formed. The cam follower portion 5a penetrates the straight groove 8d of the fixed cylinder 8 and engages with the cam groove of the cylindrical cam 9. Also, the sleeve portion 5b
It is formed at a position opposing the optical axis in the circumferential direction of the fourth group lens barrel 5, and engages with the guide bar 8 c of the fixed barrel 8.

Reference numeral 6 denotes a fifth-group barrel for holding the fifth lens group, and, like the second-group barrel 3, a convex cam follower portion 6a and an L-shaped The three sleeve portions 6b are formed. The cam follower 6 a penetrates the straight groove 8 d of the fixed barrel 8 and engages with the cam groove of the cylindrical cam 9. Also, the sleeve portion 6b
It is formed at a position facing the circumferential direction of the fifth lens barrel 6 with the optical axis interposed therebetween, and engages with the guide bar 8 c of the fixed barrel 8.

Here, the sleeve portions 3b to 6b are
By preventing the lens barrels (the second lens barrel 3 to the fifth lens barrel 6) from falling down with respect to the optical axis,
Stable optical performance of the lens barrel can be obtained. The second lens group, the third lens group, and the fourth lens group (the first lens group described in claims of the present application) are zoom lens groups, and these lens groups are optical axis. Zooming is performed by moving in the direction. Also,
The fifth lens group is a correction lens group for correcting a focal plane during zooming.

Reference numeral 7 denotes a sixth lens barrel for holding the sixth lens group, which is attached to the flange of the fixed cylinder 8 so as to be rotatable around the optical axis.

Reference numeral 8 denotes a fixed cylinder, and a bearing 8 for holding a focus drive shaft 10 to be described later is provided on the outer periphery of the fixed cylinder 8.
a and a bearing portion 8b for holding a cylindrical cam 9 described later. The fixed barrel 8 is formed with a rectilinear groove 8 d extending in the optical axis direction, and has two guide bars 8 c extending in the optical axis direction on the inner peripheral surface of the fixed barrel 8. Further, three inclined surfaces 8 e are formed on the flange portion of the fixed cylinder 8.

In this embodiment, the bearings 8a, 8
Although “b” is integrally formed on the outer periphery of the fixed cylinder 8, a unit 20 having the bearing portions 8 a and 8 b may be separately provided, and this unit 20 may be attached to the outer periphery of the fixed cylinder 8.

Reference numeral 9 denotes a cylindrical cam formed in a cylindrical shape.
On the outer periphery of the cylindrical cam 9, cam followers 4a to 6a
Are formed with the respective cam grooves. Both ends of the cylindrical cam 9 are formed in a convex shape, and the convex portion is engaged with the bearing portion 8b of the fixed cylinder 8, whereby the cylindrical cam 9 is rotatably held. Further, zoom driving gears 9a and 9b are attached to the distal end of the convex portion of the cylindrical cam 9.

Reference numeral 10 denotes a focus drive shaft (a transmission shaft member according to the present invention), and a focus drive gear 10a is attached to one end of the focus drive shaft 10. The focus drive shaft 10 penetrates the cylindrical cam 9 and is rotatably held at both ends by bearings 8 a of the fixed barrel 8. Here, the focus drive shaft 10 is held by the bearing portion 8a without contacting the cylindrical cam 9. Reference numeral 11 denotes a focus gear, which is attached to the other end of the focus drive shaft 10 and meshes with a gear formed on the focus ring 1.

Reference numeral 12 denotes a focus motor (a second drive source according to the present invention) serving as a drive source when performing focusing. The focus motor 12 is provided with a focus output gear 12a. Here, the focus output gear 12a meshes with the focus drive gear 10a, and the driving force of the focus motor 12 is transmitted to the focus drive gear 10a via the focus output gear 12a. Reference numeral 13 denotes a zoom motor (a first drive source according to the present invention) as a drive source for performing zooming. The zoom motor 13 is provided with a zoom output gear 13a. Here, the zoom output gear 13a
Are engaged with the zoom drive gear 9a, and the driving force of the zoom motor 13 is transmitted to the zoom drive gear 9a via the zoom output gear 13a.

Next, the procedure for assembling the lens barrel of the present embodiment in the above-described configuration will be described.

First, the first lens barrel 2, the second lens barrel 3, the third lens barrel 4, the fourth lens barrel 5, the fifth lens barrel 6, and the sixth lens barrel 7 have respective lens groups (first lens barrel). The lens unit is completed by incorporating the lens group to the sixth lens group.

Next, the helicoid formed on the outer circumference of the first lens barrel 2 is engaged with the helicoid formed on the inner circumference of the fixed barrel 8 so that the first lens barrel 2 is fixed inside the fixed barrel 8. Incorporate in. Then, the focus ring 1 is screwed to the first lens barrel 2.

Next, a sleeve portion 3b formed in the circumferential direction of the second lens barrel 3 is engaged with a guide bar 8c formed on the inner periphery of the fixed barrel 8, and a linear groove formed in the fixed barrel 8 is formed. The cam follower portion 3a of the second lens barrel 3 penetrates through 8d, and the second lens barrel 3 is incorporated into the fixed barrel 8. Similarly, the third-group barrel 4, the fourth-group barrel and the fifth-group barrel 6 are connected to the fixed barrel 8
Built inside.

Next, the focus drive shaft 10 is inserted into the through hole formed inside the cylindrical cam 9, and the focus drive shaft 10 protrudes from the through hole of the cylindrical cam 9.
By attaching the focus gear 11 to the other end of the cylindrical cam unit, the cylindrical cam unit is completed. Then, while the cam followers 3a to 6a are engaged with the cam grooves of the cylindrical cam 9, the cylindrical cam unit is engaged with bearings 8a and 8b formed on the outer periphery of the fixed cylinder 8. Also, the holding member 16
Is attached to the bearing portion 8a by screwing or bayonet connection. Then, a flat washer 15 is attached to the focus drive shaft 10 to restrict the movement of the focus gear 11 in the optical axis direction.

Next, the sixth lens barrel 7 is mounted on the flange of the fixed barrel 8.
Is temporarily fixed with a screw. Here, the slope 8e formed on the flange portion of the fixed barrel 8 is inclined with respect to the plane orthogonal to the optical axis, and when the sixth group barrel 7 is rotated around the optical axis, the sixth group barrel 7 By moving back and forth in the axial direction, the sixth lens group can be moved in the optical axis direction. As described above, by moving the sixth lens group in the optical axis direction, it is possible to perform the flange back adjustment of the lens barrel.

The focus motor 12 and the zoom motor 13 are mounted on the motor base plate 14. Then, the focus output gear 12a is engaged with the focus drive gear 10a, and the zoom output gear 13a is engaged with the zoom drive gear 9a. Then, the motor ground plate 14 is screwed to the flange portion of the fixed cylinder 8. Thereby, the assembly of the lens barrel according to the present embodiment is completed.

After the assembly of the lens barrel is completed, the sixth lens barrel 7 is rotated around the optical axis, and the sixth lens barrel 7 is moved in the optical axis direction to perform the flange back adjustment.
After performing this flange back adjustment, the focus motor 12 and the zoom motor 13 are operated to check the operation state of the lens barrel, thereby completing the lens barrel as a product.

Next, the focus operation and the zoom operation of the lens barrel according to the present embodiment will be described.

When performing focusing, the focus motor 12 is operated by a control signal from outside the lens barrel, and the rotational force of the focus motor 12 is controlled by the focus output gear 12.
a to the focus drive gear 10a.
When the focus drive gear 10a rotates, the focus gear 11 rotates via the focus drive shaft 10 to rotate the focus ring 1 around the optical axis. When the focus ring 1 rotates around the optical axis, the first lens barrel 2
Focusing is performed by moving the (first lens group) in the optical axis direction.

When performing zooming, the zoom motor 13 is operated by a control signal from outside the lens barrel, and the rotational force of the zoom motor 13 is transmitted to the zoom drive gear 9a via the zoom output gear 13a. Zoom drive gear 9a
Rotates, the cylindrical cam 9 rotates, and the cam followers 3a to 6a formed in the respective lens barrels (the second lens barrel 3, the third lens barrel 4, the fourth lens barrel 5, and the fifth lens barrel 6) are cylindrical cams. The guide 9 moves in the optical axis direction by being guided by a cam groove. Thereby, each lens barrel (second lens group to fifth lens group) moves in the optical axis direction to perform zooming.

Here, the focus drive shaft 10 and the cylindrical cam 9 are engaged with the bearing portions 8a and 8b, respectively, and are in a non-contact state with each other. When one of them rotates, the other does not rotate. This allows
The positional accuracy of the focus lens group and the zoom lens group can be ensured.

(Second Embodiment) FIG. 3 shows a sectional view (A) and a front view (B) of a lens barrel according to a second embodiment of the present invention.

The lens barrel according to the present embodiment is a lens barrel that can perform focusing and zooming by driving a motor and can perform focusing and zooming by a photographer's operation. The basic structure of the lens barrel in the present embodiment is the first structure.
The structure is the same as that of the lens barrel in the embodiment.
The same components as those of the embodiment are denoted by the same reference numerals.

Reference numeral 30 denotes a focus ring, and a first lens barrel 2
And a rear end gear portion of the focus ring 30 is formed, and this gear portion meshes with the focus gear 11.

Reference numeral 2 denotes a first lens barrel for holding a first lens group (focusing lens group). A helicoid portion is formed on the outer periphery of the first lens barrel 2. It engages with the helicoid part formed on the circumference. Reference numeral 31 denotes a zoom ring operated when performing zooming, and is rotatable around the optical axis. A gear portion is formed at the rear end of the zoom ring 31, and the gear meshes with a zoom drive gear 9 b attached to one end of the cylindrical cam 9.
At the rear of the zoom ring 31, a notch on the periphery for the focus gear is required.

As in the first embodiment, a zoom motor (not shown) is connected to the zoom driving gear 9a via a zoom output gear, and a zoom motor (not shown) is connected to the focus driving gear 10a via a focus output gear. Of focus motors are connected.

The focus operation and the zoom operation of the lens barrel according to the present embodiment in the above configuration will be described.

When focusing is performed by a photographer, the focus ring 30 is rotated around the optical axis, whereby the first lens barrel 2 advances and retreats in the optical axis direction. Thereby, the first lens group, which is a lens group of the focusing system, moves in the optical axis direction, and focusing is performed.

When focusing is performed by driving the motor, the focus motor operates according to a control signal from outside the lens barrel, and the rotational force of the focus motor is transmitted to the focus drive gear 10a via the focus output gear. When the focus drive gear 10a rotates,
The focus gear 11 rotates via the focus drive shaft 10 to rotate the focus ring 30 around the optical axis. When the focus ring 30 rotates around the optical axis, the first lens barrel 2 is moved in the optical axis direction to perform focusing.

Next, when performing zooming by a photographer's operation, by rotating the zoom ring 31 around the optical axis, the cylindrical cam 9 is moved through the zoom drive gear 9b engaged with the gear portion of the zoom ring 31. Rotate. When the cylindrical cam 9 rotates, each lens barrel (second lens barrel 3, third lens barrel 4, 4)
The cam followers 3a to 6a formed in the group barrel 5 and the group 5 barrel 6) are guided by the cam grooves formed in the cylindrical cam 9 and move in the optical axis direction. Thereby, each lens barrel (the second lens barrel 3 to the fifth lens barrel 6) moves in the optical axis direction to perform zooming.

When zooming is performed by driving the motor, the zoom motor operates according to a control signal from the outside of the lens barrel, and the torque of the zoom motor is transmitted to the zoom drive gear 9a via the zoom output gear. The rotation of the zoom drive gear 9a causes the cylindrical cam 9 to rotate, and each lens barrel (2
Group lens barrel 3, Group 3 lens barrel 4, Group 4 lens barrel 5, and Group 5 lens barrel 6)
The cam followers 3a to 6a are guided by cam grooves formed in the cylindrical cam 9 and move in the optical axis direction. Thereby, each lens barrel (the second lens barrel 3 to the fifth lens barrel 6) moves in the optical axis direction to perform zooming.

The lens barrels in the first and second embodiments described above can be used for an optical device such as a camera.

(Third Embodiment) FIG. 4 is a sectional view of a lens barrel according to a third embodiment of the present invention. The lens barrel of the present embodiment is also a lens barrel that can perform focusing and zooming by driving a motor or operating a photographer. Note that the basic structure of the lens barrel in the present embodiment is the same as the structure of the lens barrel in the first embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals. Further, the lens barrel of the present embodiment is used for a liquid crystal projector.

Reference numeral 40 denotes a first lens barrel, which holds a first lens group (focusing lens group). A helicoid portion is formed on the outer circumference of the first lens barrel 40 and engages with a helicoid portion formed on the inner circumference of the fixed barrel 8.

Reference numeral 41a denotes a zoom operation knob (first operation member described in the claims of the present application) which is rotated when performing zooming. The zoom operation knob 41a is integrally formed with a gear. Reference numeral 41b denotes a focus operation knob (a second operation member described in the claims of the present application) which is rotated when focusing is performed.
1b is integrally formed with a gear. Here, a knob shaft 43 serving as a rotation axis of the zoom operation knob 41a and the focus operation knob 41b is fixed to the support plate 45.

Reference numeral 42a denotes an intermediate gear, which meshes with the gear of the zoom control knob 41a and the zoom drive gear 9b attached to one end of the cylindrical cam 9. Reference numeral 42b denotes an intermediate gear, which meshes with the gear of the focus operation knob 41b and the focus gear 11 attached to one end of the focus drive shaft 10. Here, the intermediate gear 42
The intermediate gear shaft 44 serving as the rotation shaft of the a
5 is fixed. 46 is a main body cover of the liquid crystal projector. A focus ring 47 is rotatable around the optical axis, and is fixed to the first lens barrel 40. Also,
A gear portion is formed at the rear end of the focus ring 47, and the gear portion meshes with the focus gear 11.

As in the first embodiment, a zoom motor (not shown) is connected to the zoom drive gear 9a via a zoom output gear, and not shown to the focus drive gear 10a via a focus output gear. Of focus motors are connected.

The focus operation and the zoom operation of the lens barrel according to the present embodiment in the above configuration will be described.

When performing zooming by a photographer's operation,
By rotating the zoom operation knob 41a, this rotational force is transmitted to the cylindrical cam 9 via the gear, the intermediate gear, and the zoom drive gear 9b of the zoom operation knob 41a. When the cylindrical cam 9 rotates, each lens barrel (the second lens barrel 3,
The cam followers 3a to 6a formed in the third lens barrel 4, the fourth lens barrel 5, and the fifth lens barrel 6) are guided by the cam grooves formed in the cylindrical cam 9 and move in the optical axis direction. Thereby, each lens barrel (the second lens barrel 3 to the fifth lens barrel 6) moves in the optical axis direction to perform zooming.

When zooming is performed by driving the zoom motor 13, the zoom motor is operated by a control signal from outside the lens barrel, and the rotational force of the zoom motor is transmitted to the zoom drive gear 9a via the zoom output gear. You.
The rotation of the zoom drive gear 9a causes the cylindrical cam 9 to rotate,
Each lens barrel (second lens barrel 3, third lens barrel 4, fourth lens barrel 5 and 5)
The cam followers 3a to 6a formed on the group lens barrel 6) are guided by cam grooves formed on the cylindrical cam 9 and move in the optical axis direction. Thereby, each lens barrel (the second lens barrel 3 to the fifth lens barrel 6) moves in the optical axis direction to perform zooming.

Next, when performing focusing by a photographer's operation, by rotating the focus operation knob 41b, this rotational force is applied to the focus operation knob 41b.
, The intermediate gear 42b and the focus gear 11 are transmitted to the focus ring 47. Accordingly, the focus ring 47 rotates around the optical axis, and moves the first lens barrel 40 in the optical axis direction. And the first lens barrel 4
Focusing is performed by moving 0 in the optical axis direction.

When focusing is performed by driving the focus motor 12, the focus motor operates according to a control signal from outside the lens barrel, and the rotational force of the focus motor is transmitted to the focus drive gear 10a via the focus output gear. Is transmitted. When the focus drive gear 10a rotates, the focus gear 11 rotates via the focus drive shaft 10, and rotates the focus ring 47 around the optical axis. When the focus ring 47 rotates around the optical axis, the first lens barrel 40 is moved in the optical axis direction to perform focusing.

[0061]

According to the present invention, the transmission shaft member for transmitting the driving force from the second drive source to the moving mechanism is disposed inside the cylindrical cam, so that the transmission shaft member is arranged around the cylindrical cam. Since it is not necessary to dispose the lens barrel on the lens barrel, the lens barrel can be reduced in size. Further, by penetrating the transmission shaft member inside the cylindrical cam, it is possible to suppress an increase in the weight of the lens barrel as compared with a case where the transmission shaft member is arranged outside the cylindrical cam.

Here, by forming bearing portions for rotatably holding the cylindrical cam and the transmission shaft member on the outer periphery of the fixed cylinder, the cylindrical cam and the transmission shaft disposed inside the cylindrical cam are formed. The members can be rotated without interfering with each other. Further, by providing a first operating member for transmitting a user operating force to the cam cylinder and a second operating member for transmitting a user operating force to the transmission shaft member, the user can also operate by The first lens group and the second lens group can be moved in the optical axis direction, and fine adjustment of the lens groups can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view (A) and a front view (B) of a lens barrel according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the lens barrel according to the first embodiment.

FIG. 3 is a sectional view (A) and a front view (B) of a lens barrel according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a lens barrel according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a conventional lens barrel.

[Explanation of symbols]

1, focus ring 2, first-group barrel 3, second-group barrel 4, third-group barrel 5, fourth-group barrel 6, fifth-group barrel 7, sixth-group barrel
8, fixed cylinder 8a, bearing portion (for focus drive shaft) 8b, bearing portion (for cylindrical cam) 9, cylindrical cam 9a / 9b, zoom drive gear 1
0, focus drive shaft 11, focus gear 12, focus motor 12a, focus output gear 13, zoom motor 13a, zoom output gear 14, motor base plate 1
5, flat washer 20, unit (bearing part) 30, first lens barrel 3
1, zoom ring 40, first lens barrel 41a, zoom operation knob 41b, focus operation knob 42a / b, intermediate gear 43, knob shaft 44, intermediate gear shaft 45a / b,
Support plate 46, cover 51, lens holding frame 52, guide bar 53, fixing member 54, drive sources 55a / b, gear 56, cylindrical cam 57, cam groove 58, projecting portion

Claims (8)

[Claims] 1. A cylindrical cam, which is disposed on the outer periphery of a fixed cylinder and rotates by receiving a driving force from a first driving source, thereby driving a first lens group in a direction of an optical axis; A transmission shaft member for transmitting the driving force from the driving source to a moving mechanism for moving the second lens group in the optical axis direction, and the transmission shaft member penetrates the inner periphery of the cylindrical cam. A lens barrel characterized in that the lens barrel is arranged in a manner as described above. 2. The lens barrel according to claim 1, wherein the first lens group is a zoom system lens group, and the second lens group is a focus system lens group. 3. The device according to claim 1, wherein the first drive source and the second drive source are arranged side by side in a circumferential direction along an outer periphery of the fixed cylinder. Lens barrel. 4. The first drive source and the second drive source are arranged on a rear end side of the fixed cylinder,
4. The lens barrel according to claim 1, wherein the second lens group is disposed ahead of the first lens group in the optical axis direction. 5. 5. The bearing according to claim 1, wherein a bearing portion for rotatably holding the cylindrical cam and the transmission shaft member is formed on an outer periphery of the fixed cylinder. Lens barrel. 6. The apparatus according to claim 1, further comprising a first operating member for transmitting a user operating force to said cam barrel, and a second operating member for transmitting a user operating force to said transmission shaft member. The lens barrel according to any one of 1 to 5. 7. A camera having the lens barrel according to claim 1. 8. An electronic apparatus comprising the lens barrel according to claim 1.