JPH09251125A - Lens barrel and optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel and an optical equipment efficiently transmitting output from an ultrasonic motor. SOLUTION: In a lens barrel, a roller 20 is revolved around an optical axis to rotate an output ring 22 centering the optical axis by a differential mechanism constituted of a manual operation force input ring 19, a rotary ring 12 and the roller 20; and it is provided with a 1st annular belleville spring 8 and a 1st annular nut 11 applying pressure to allow the rotor of the ultrasonic motor constituted of the rotary ring 12 and a peripheral direction moving member 14 to press-contact with an oscillating member 6, and a 2nd annular belleville spring 24 and a 2nd annular nut 25 applying the pressure to allow the input ring 19 to press-contact with the 1st roller 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel and an optical device, and more particularly, to a lens barrel capable of performing autofocus operation and manual focus operation by an ultrasonic motor without requiring a special switching operation. And optical equipment.

[0002]

2. Description of the Related Art FIG. 6 shows a sectional view of a conventional lens barrel.

In FIG. 6, reference numeral 501 denotes an outer cylinder of the lens barrel, and 503 denotes an outer cylinder portion 5 arranged in front of the outer cylinder 501.
03a and a helicoid forming portion 503b arranged inside the outer cylinder portion 503a, and 504 is a fixed cylinder 5.
No. 03, the circumferential groove 503c formed on the outer circumferential surface of the outer circumferential portion 503a and the circumferential groove 5 formed on the outer circumferential surface of the outer cylinder 501.
01a, which is a manual operation ring that is rotatable about the optical axis Z of the lens L, 505 is a lens holder that holds the lens L, and a helicoid 505b formed on the outer periphery of the lens holder 505 forms the helicoid of the fixed barrel 503. Part 503
It is screwed into a helicoid 503d formed on the inner peripheral surface of b. A groove 505a extending in parallel with the optical axis Z is provided through the lens holder 505, and the optical axis Z is provided in the groove 505a.
A lens holder drive arm 52 described later having a portion parallel to
0 is slidably inserted only in the radial direction of the lens L.

Reference numeral 502 denotes a tubular body. One end of the outward flange portion 502a is fastened to the rear end of the fixed cylinder 503 with a screw 522, and the other end of the inward flange portion 502b is connected to the outer cylinder 5.
It is fastened to 01 with screw 523. On the outer peripheral surface of the cylindrical body 502, in order to input all the components of the ultrasonic motor 530, the output member 531 contacting the rotating ring 512 of the ultrasonic motor 530, and the rotating torque of the manual operation ring 504. Manual operation force input ring 516
And are installed.

The constituent members of the ultrasonic motor 530 and the structure of the output member 531 will be described below.

The ultrasonic motor 530 has an annular vibrating member 506 (corresponding to a stator) having a trapezoidal transverse cross section, an electrostrictive element 507 physically joined to one end surface of the vibrating member 506, and an electrostrictive element. An annular vibration absorber 510 made of felt or the like pressed against the surface of 507 and the vibration absorber 5
10, a first annular spacer 509 arranged in contact with one end surface of the tenth annular member, a first annular disc spring 508 for pushing the spacer 509 toward the annular vibrating member, and a screw formed on the outer peripheral surface of the tubular body 502. A first annular nut 511 screwed to the portion 502d, a rotary ring 512 that is a part of the rotor of the ultrasonic motor 530, a rubber ring 513 for preventing axial vibration from being transmitted to the rotary ring 512, and an annular ring. The circumferential movement member 514 and the projection 515a of the outer peripheral edge that is fitted to the outer periphery of the tubular body 502 are configured by various members such as the vibration member rotation stopping member 515 inserted in the groove 506a of the vibration member 506. There is.

The rotary ring 512, the rubber ring 513, and the circumferential direction moving member 514 are integrated into an ultrasonic motor 53.
No. 0 rotor is configured, and the rotor including the rotating ring 512, the rubber ring 513, and the circumferential moving member 514 rotates about the optical axis Z by the circumferential traveling wave vibration generated in the vibrating member 506.

The nut 511 adjusts the elastic force of the disc spring 508 to adjust the vibrating member 506 and the circumferential moving member 5.
It is a member for adjusting the contact pressure with 14.

Rotating ring 512 of ultrasonic motor 530
The output ring 531 arranged adjacent to the end surface of the rotor (that is, the rotor) has a ring 519 rotatably fitted only on the outer peripheral surface of the tubular body 502, and at least three locations on the circumference of the ring 519. A roller support shaft 518 fixed so as to project from the outer peripheral surface of the ring 519 on a radial axis orthogonal to the optical axis (axis of the ultrasonic motor).
And a hollow roller 517 fitted on the roller support shaft 518.

The ring 519 is a driving force generating unit (including the ultrasonic motor 530 and the output ring 531) 5.
The lens holder 505 doubles as an output member of 32.
L-shaped lens holder drive arm 5 for rotating the lens
20 is fastened to the end surface of the ring 519 by screws 521.

The roller 517 has an outer peripheral surface and the end surface of the rotary ring 512 and the manual operation force input ring 5.
It is in contact with the end face of 16.

The manual operation force input ring 516 is rotatably fitted to the cylindrical body 502, and the ring 516 is in contact with the outer peripheral surface of the roller 517 at one end surface (the end surface on the right side in the drawing).

The outer peripheral edge portion of the manual operation force input ring 516 is engaged with the recess of the inner peripheral surface of the manual operation ring 504, and the ring 516 is rotated by the manual operation ring 504.

The lens holder drive arm 520 is inserted into the groove 505a of the lens holder 505 through a hole 502c penetrating the peripheral surface of the cylindrical body 502. In addition,
The hole 502c provided through the peripheral surface of the tubular body 502 is a groove-shaped hole extending along the circumferential direction.

The roller 517 is a manual operation force input ring 51 for performing a manual focus operation.
6 and the rotating ring 512 of the ultrasonic motor for performing the autofocus operation, thereby forming a differential mechanism. Then, the focusing lens is driven on the output side thereof, and the features of the structure of the ultrasonic motor are fully utilized, especially in the manual focusing operation.

The fact that the characteristics of the structure of this ultrasonic motor are fully utilized means that the rotor, which is a characteristic of the ultrasonic motor, is in pressure contact with the stator, so that the rotor and the stator are driven except that the motor is driven. The non-rotating state of the rotor is always maintained by the frictional force, and the motor input ring connected thereto is kept in the non-rotating state without requiring any special structure.

In the above differential mechanism, the pressing force of the disc spring 508 as a pressing member acts so that the manual operation force input ring 516 maintains the non-rotation state even when the rotating ring 512 rotates, and conversely the manual operation is performed. When the force input ring 516 is rotated to perform manual focusing, the rotor (512 to 514) of the ultrasonic motor is in pressure contact with the stator, so that the non-rotation state of the rotor is maintained and no switching mechanism is used. It is possible to switch between auto focus operation and manual focus operation without using.

[0018]

In the above-mentioned conventional lens barrel, a roller is used for the planetary mechanism in the differential mechanism for switching the manual focus operation and the autofocus operation without conversion, and both sides sandwiching the roller are used. The driving force is transmitted by frictionally contacting the output end face of the rotary ring of the ultrasonic motor with the output end face of the manual focus operation force input ring. The pressing force for the frictional contact uses the pressure applied by the pressure member on the stator side of the ultrasonic motor to efficiently transfer the output from the ultrasonic motor to the roller. The pressing force was set so as to balance the slip torque of frictional contact between the output end face of the ultrasonic motor and the output end face of the manual focus ring. As a result, friction occurs between the base that drives the focus lens, which has a large lens load, and the rollers, and the output from the ultrasonic motor cannot be transmitted efficiently, and the lens cannot be driven sufficiently. There were challenges.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lens barrel and an optical device that can efficiently transmit the output of an ultrasonic motor.

[0020]

To achieve the above object, the first invention of the present application is directed to a first rotating ring which rotates about an optical axis, an annular rotor and a stator which are arranged concentrically with the optical axis. An ultrasonic motor comprising: a first rotating ring or a rotating member to which a rotational force is transmitted by the first rotating ring or the rotor and which rotates about a radial direction orthogonal to an optical axis. And a lens mirror that revolves the rotating member around an optical axis by a differential mechanism including the ultrasonic motor and the rotating member, and rotates a second rotating ring including the rotating member around the optical axis. In the cylinder, first pressurizing means for applying pressure to bring the rotor and stator of the ultrasonic motor into pressure contact, and second pressurizing means for applying pressure to bring the first rotary ring into press contact with the rotating member. Characterized by having .

The second invention of the present application is, in addition to the first invention of the present application,
The pressure of the first pressurizing means is prevented from being transmitted to the rotary member, and the pressure of the second pressurizing means received via the rotary member and a part of the rotor is applied to the rotor and the stator. Pressure transmission preventing means for preventing transmission to the contact surface.

A third invention of the present application is characterized in that the lens barrel of the first and second inventions of the present application is used in an optical device.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.

Embodiment 1 1 is a longitudinal sectional view of an essential part showing a first embodiment of a lens barrel according to the present invention, and FIG. 2 is a longitudinal sectional view of a driving force generating unit detachably incorporated in the lens barrel of FIG. Is.

In FIGS. 1 and 2, 1 is an outer cylinder of a lens barrel to be attached to an optical device body (not shown), and 3 is an outer cylinder 1.
A fixed cylinder 4 having an outer cylinder portion 3a arranged in front of the outer cylinder, an inner cylinder portion 3b arranged inside the outer cylinder 1 and a helicoid forming portion 3c arranged inside the outer cylinder portion 3a. Three
Is fitted in the circumferential groove 3e formed on the outer peripheral surface of the outer cylinder portion 3a and the circumferential groove 1b formed on the outer peripheral surface of the outer cylinder 1, and is centered on the central axis Z (that is, the optical axis) of the lens L. A rotatable manual operation ring 5 is a lens holder to which the lens L is fixed, and the helicoid 5b formed on the outer peripheral surface of the lens holder is screwed into the helicoid 3d formed on the inner peripheral surface of the helicoid forming portion 3c of the fixed barrel 3. I am fit. A groove 5a extending parallel to the optical axis Z is provided in the lens holder 5, and a lens holder drive arm 26 having a portion parallel to the optical axis Z is provided in the groove 5a and has a radius of the lens L. It is slidably inserted only in the direction.

In the annular space between the outer cylinder 1 and the inner peripheral portion 3b of the fixed cylinder 3, the cylindrical driving force generating unit 3 shown in FIG.
0 is inserted, and the tubular body 2 serving as the frame or the base plate of the driving force generating unit 30 is screwed in the inward flange portion 2e at the rear end thereof by the screw 28 and the inward flange portion 3e of the fixed barrel 3 and the outer barrel. 1 is fastened to the inward flange portion 1a.

On the outer peripheral surface of the cylindrical body 2, as shown in FIG. 2, all the components of the ultrasonic motor 29, the output member 31 contacting the rotary ring 12 of the ultrasonic motor 29, and the manual. A manual operation force input ring 19 for inputting the rotational torque of the operation ring 4 is mounted.

The constituent members of the ultrasonic motor 29, which is a constituent element of the driving force generating unit 30, and the output member 3 will be described below.
The structure 1 and the like will be described.

The ultrasonic motor 29 has an annular vibrating member 6 (corresponding to a stator) having a trapezoidal cross section, and an electrostrictive element 7 physically joined to one end surface of the vibrating member 6.
An annular vibration absorber 10 made of felt or the like pressed against the surface of the electrostrictive element 7, a first annular spacer 9 arranged in contact with one end face of the vibration absorber 10, and the spacer 9 A first annular disc spring 8 which is pressed toward the vibrating member, a first annular nut 11 screwed into a screw portion 2a formed on the outer peripheral surface of the tubular body 2, and a bearing ball 1 on the inner periphery.
The rotary ring 1 which is a part of the rotor of the ultrasonic motor 29 in which the V-shaped ball race groove 12a for receiving 6 is formed.
2. The rubber ring 13 for preventing axial vibrations from being transmitted to the rotary ring 12, the annular circumferential moving member 14, and the outer peripheral edge projection 15a fitted on the outer periphery of the tubular body 2 of the vibrating member 6. The vibration member anti-rotation member 15 inserted into the groove 6a, the first ball receiving ring 17 fitted to the outer periphery of the tubular body 2 and having an inclined surface at one end, and the outer peripheral surface of the tubular body 2 are formed. Second ball receiving ring 18, which has an inclined surface at one end opposed to the inclined surface of the first ball receiving ring 17, which is screwed into the threaded portion 2b, the ball race groove 12a of the rotating ring 12, and the first ball receiver. It is composed of various members such as a plurality of bearing balls 16 held by the inclined surface of the ring 17 and the inclined surface of the second ball receiving ring 18.

Since the rotating ring 12, the bearing balls 16 and the ball receiving rings 17 and 18 constitute a radial ball bearing structure, only rolling friction resistance is applied to the rotating ring 12, so that the rotating torque is reduced. Therefore, the load torque applied to the motor is also reduced,
There is an effect that the output of the motor is efficiently transmitted.

The rotating ring 12, the rubber ring 13, and the circumferential moving member 14 are integrated into an ultrasonic motor 29.
Of the rotating ring 12 and the rubber ring 13 due to the circumferential traveling wave vibration generated in the vibrating member 6.
In addition, the rotor including the circumferential moving member 14 rotates about the optical axis Z.

The nut 11 adjusts the contact pressure between the vibrating member 6 and the circumferential moving member 14 by adjusting the elastic force of the disc spring 8. That is, the nut 11 and the disc spring 8 constitute the first pressing means of the present invention.

An output member 31 disposed adjacent to the end face of the rotary ring 12 (ie rotor) of the ultrasonic motor 29.
As shown in FIG. 2, is a ring 22 rotatably fitted on the outer peripheral surface of the tubular body 2 and a radial axis line orthogonal to the axis line Z (axis line of the ultrasonic motor) of the ring 22. The roller support shaft 21 fixed so as to project from the outer peripheral surface of the ring 22 at a plurality of at least three locations on the circumference of the ring 22, and the hollow roller 20 fitted to the roller support shaft 21. And,

The ring 22 is a driving force generating unit 30.
An L-shaped lens holder drive arm 26 for driving the lens holder 5 to rotate is fastened to the end face of the ring 22 with a screw 27.

The roller 20 has an outer peripheral surface and an end surface of the rotary ring 12 and a manual operation force input ring 19.
It is in contact with the end surface of (hereinafter, abbreviated as ring 19). The ring 19 is rotatably fitted to the tubular body 2, and the ring 19 contacts the outer peripheral surface of the roller 20 at one end face (the end face on the right side in FIGS. 1 and 2) and the second end at the other end face. Is in contact with the annular spacer 23.

A screw portion 2c formed on the outer peripheral surface of the tubular body 2.
The second annular nut 25, which is screwed into the, is adjusted by adjusting the elastic force of the second annular disc spring 24 so that the contact pressure between the roller 20 and the rotating ring 12 and the ring 19, the ring 19 and the spacer. Adjust the contact pressure with 23. That is, the nut 25 and the disc spring 24 constitute the second pressing means of the present invention.

The outer peripheral edge of the ring 19 is engaged with the concave portion 4a on the inner peripheral surface of the manual operation ring 4, and this ring 19
Is rotated by a manual operation ring 4. The ring 19 can rotate only when a driving torque larger than the frictional resistance with the spacer 23 is transmitted from the manual operation ring 4, and does not rotate otherwise. Therefore, the ring 19 does not rotate unless the user of the lens barrel rotates the manual operation ring 4 with a torque that overcomes the frictional resistance between the ring 19 and the spacer 23.

Reference numeral 26 denotes a lens holder driving arm fixed to the ring 22 by means of a screw 27, and this lens holder driving arm 26 has a hole 2d penetrating the peripheral surface of the cylindrical body 2.
And a hole 3e penetrating the inner cylinder portion 3b of the fixed cylinder 3 and inserted into the groove 5a of the lens holder 5. The hole 2d penetrating the peripheral surface of the cylindrical body 2 and the hole 3e penetrating the inner cylinder portion 3b of the fixed cylinder 3 are groove-shaped holes extending along the circumferential direction.

Next, the operation of the lens barrel of the present embodiment having the above structure will be described.

When the user of the lens barrel tries to drive the lens holder 5 by the force of the ultrasonic motor 29, a focusing switch (not shown) is operated. Then, a voltage is applied to the electrostrictive element 7 by the operation of a control circuit (not shown), and as a result, the vibration that propagates in the circumferential direction is vibrated.
Occurs in the rotating ring 12 due to the vibration of the vibrating member 6.
The rotor including the rubber ring 13 and the circumferential moving member 14 is rotated about the optical axis Z.

The hollow roller 2 is rotated by the rotation of the rotor.
0 receives the rotating torque from the rotating ring 12, but at this time, since the manual operation ring 4 is not rotated,
The ring 19 is also not rotating. Therefore, the roller 2
0 rolls along the end face of the ring 19 while rotating around the roller support shaft 21, and the ring 22 is rotated about the optical axis Z via the roller support shaft 21.
For this reason, the lens holder drive arm 26 is also attached to the ring 22.
Since the lens holder 5 is rotated about the optical axis Z, the lens holder 5 is rotated about the optical axis Z and is moved in the axial direction by the action of the helicoids 3d and 5b to perform autofocusing.

On the other hand, when the lens barrel user wants to drive the lens holder 5 with the force of the fingertip without driving the lens holder 5 with the force of the ultrasonic motor 29, the focusing switch is not operated and the manual operation ring 4 is illuminated. Rotate with the fingertip about the axis Z. Then, the ring 19 becomes the spacer 2
Although it rotates around the optical axis Z by overcoming the frictional resistance with 3, the ultrasonic motor 29 is not driven at this time, so the rotating ring 12 which is the rotor of this ultrasonic motor 29 is stationary. Therefore, the roller 20 rolls along the end surface of the rotating ring 12 while being rotated by the ring 19. As a result, the ring 22 is rotated about the optical axis Z via the roller support shaft 21, and the lens holder 5 is axially moved while being rotated by the lens holder drive arm 26 to perform manual focusing.

Embodiment 2 FIG. 3 is a longitudinal sectional view of a main part showing a second embodiment of the lens barrel according to the present invention.
FIG. 4 is a vertical cross-sectional view of the driving force generation unit detachably incorporated in the lens barrel of FIG.

In FIGS. 3 and 4, 101 is an outer cylinder of the lens barrel, 103 is an outer cylinder portion 103a arranged in front of the outer cylinder 101, an inner cylinder portion 103b arranged inside the outer cylinder 101, and a later-described portion. Fixed cylinder having a cam hole forming portion 103c arranged inside the manual operation ring 104
Reference numeral 4 denotes a central axis Z of the lens L fitted into a circumferential groove 103e formed on the outer peripheral surface of the outer cylinder portion 103a of the fixed cylinder 103 and a circumferential groove 101b formed on the outer peripheral surface of the outer cylinder 101.
A manual operation ring rotatable around (that is, the optical axis) 105 is a lens holder to which the lens L is fixed, and is engaged by a roller 127 described later in a cam hole 103d formed in the cam hole forming portion 103c of the fixed barrel 103. I am fit. Rollers 127 are fixed to the lens holder 105 by screws 128 so as to project from the outer peripheral surface of the lens holder 105 on the circumference of the lens holder 105 on the radial axis with respect to the optical axis Z.

Outer circumference 101 and inner cylinder portion 10 of fixed cylinder 103
A cylindrical driving force generation unit 132 shown in FIG. 4 is inserted in an annular space between the cylindrical body 102 and 3b, and the cylindrical body 102 which is the frame or the ground plate of the driving force generation unit 132 is at the rear end portion. In, the screw 130 is fastened to the inward flange portion 101 a of the outer cylinder 101.

On the inner peripheral surface of the cylindrical body 102, as shown in FIG. 3, all the components of the ultrasonic motor 131, and the output member 133 that contacts the rotary ring 112 of the ultrasonic motor 131, A manual operation force input ring 119 for inputting the rotational torque of the manual operation ring 104.
And are installed.

The constituent members of the ultrasonic motor 131 and
The structure and the like of the output member 133 will be described.

The ultrasonic motor 131 has an annular vibrating member 106 having a trapezoidal transverse cross section, an electrostrictive element 107 physically bonded to one end surface of the vibrating member 106, and a surface of the electrostrictive element 107. An annular vibration absorber 110 made of felt or the like that is pressed into contact, a first annular spacer 109 arranged in contact with one end face of the vibration absorber 110, and a first for pressing the spacer 109 toward the annular vibration member. One annular disc spring 108, the first annular nut 11 screwed into the screw portion 102a formed on the inner peripheral surface of the tubular body 102.
1. A rotary ring 112 which is a part of a rotor of an ultrasonic motor 131 having a V-shaped ball race groove 112a for receiving a bearing ball 116 on the outer periphery thereof.
Rubber ring 11 for preventing axial vibration from being transmitted to 12
3, an annular circumferential movement member 114, a vibrating member anti-rotation member 115 that is fitted to the inner circumference of the tubular body 102 and has an inner peripheral edge projection 115a inserted into the groove 106a of the vibrating member 106, a tubular shape. A first ball receiving ring 117 fitted to the inner circumference of the body 102 and provided with an inclined surface at one end, the tubular body 1
The second ball receiving ring 118, which has an inclined surface at one end opposed to the inclined surface of the first ball receiving ring 117, which is screwed into the screw portion 102b formed on the inner peripheral surface of the first ball receiving ring 117, and the ball race of the rotating ring 112. Groove 112a, inclined surface of first ball receiving ring 117 and second ball receiving ring 1
A plurality of bearing balls 11 held by 18 inclined surfaces
6 and other members.

The rotating ring 212 and the bearing balls 21.
6 and the ball receiving rings 217 and 218 form a radial ball bearing structure, so that the rotary ring 2
Since only rolling frictional resistance is applied to 12, rotational torque is reduced. Therefore, the load torque applied to the motor is also reduced, and the output of the motor is efficiently transmitted.

The rotary ring 112, the rubber ring 113, and the circumferential moving member 114 are integrated into one unit, and the ultrasonic motor 13
1 rotor, and the rotor composed of the rotating ring 112, the rubber ring 113, and the circumferential moving member 114 rotates about the optical axis Z by the circumferential traveling wave vibration generated in the vibrating member 106.

The nut 111 adjusts the elastic force of the disc spring 108 to adjust the vibrating member 106 and the circumferential moving member 1.
Adjust the contact pressure with 14. That is, the nut 111 and the disc spring 108 form a first pressurizing unit.

Rotation ring 112 of ultrasonic motor 131
The output member 133 disposed adjacent to the end surface of the rotor (that is, the rotor) is, as shown in FIG.
A ring 122 that is fitted on the outer peripheral surface of 26 so as to be rotatable only.
And the axis Z of this ring 122 (the axis of the ultrasonic motor)
The ring 122 at least at a plurality of locations on the circumference of the ring 122 on a radial axis orthogonal to the
The roller support shaft 121 is fixed so as to project from the outer peripheral surface of the roller, and the hollow roller 120 fitted to the roller support shaft 121.

A rotary cylinder 126, which serves as an output member 133 of the driving force generating unit 132, is arranged on the inner circumference of the ring 122. The rotary cylinder 126 has an inner peripheral portion 103b of the fixed cylinder 103 and a cam hole forming portion 103c. It is fitted on the outer circumference of the so as to be rotatable only. The rotary cylinder 126 is the fixed cylinder 10.
3, the straight hole forming portion 126a fitted on the outer periphery of the cam hole forming portion 103c, and the inner cylinder portion 103b of the fixed cylinder 103.
Has an inner cylindrical portion 126b fitted around the outer periphery of the. The straight hole forming portion 126a is provided with a straight hole 126c for engaging the roller 127 so as to be movable only in the optical axis Z direction and rotating the roller 127 about the optical axis Z to rotationally drive the lens holder 105. There is.

The roller 120 has the outer peripheral surface thereof and the end surface of the rotating ring 112 and the manual operation force input ring 1.
19 (hereinafter abbreviated as ring 119) is in contact with the end surface. This ring 119 is a spacer 123 described later.
It is rotatably fitted to the inner circumference of the one end surface (Fig. 3).
And the roller 120 on the right end face in FIG.
, And the second annular spacer 123 on the other end face.

The second annular nut 125 screwed into the threaded portion 102c formed on the inner peripheral surface of the cylindrical body 102 is adjusted by adjusting the elastic force of the second annular disc spring 124. 120, rotating ring 112 and ring 119
And the contact pressure between the ring 119 and the spacer 123 are adjusted. That is, the nut 125 and the disc spring 124 constitute the second pressurizing means.

The projection 119a of the ring 119 is engaged with the recess 104a on the inner peripheral surface of the manual operation ring 104,
It is adapted to be rotated by the manual operation ring 104. This ring 119 has a driving torque larger than the frictional resistance between itself and the spacer 123.
It can rotate only when transmitted from No. 4, and does not rotate otherwise. Therefore, if the user of the lens barrel uses the ring 1
The ring 119 does not rotate unless the manual operation ring 104 is rotated by the rotational torque that overcomes the frictional resistance between the spacer 19 and the spacer 123.

Next, the operation of the lens barrel of the second embodiment having the above structure will be described.

When the user of the lens barrel uses the lens holder 10
When trying to drive 5 by the force of the ultrasonic motor 131, a focusing switch (not shown) is operated. Then, a voltage is applied to the electrostrictive element 107 by the operation of a control circuit (not shown), and as a result, vibration that advances in the circumferential direction is generated in the vibrating member 106, and the vibration of the vibrating member 106 causes the rotating ring 112 and the rubber ring A rotor including 113 and the circumferential moving member 114 is rotated about the optical axis Z.

By the rotation of this rotor, the hollow roller 1
Although 20 receives the rotation torque from the rotating ring 112, the ring 119 is not rotating because the manual operation ring 104 is not rotated at this time. Therefore,
The roller 120 rolls along the end surface of the ring 119 while rotating around the roller support shaft 121, and the ring 122 is rotated about the optical axis Z via the roller support shaft 121. Therefore, the protrusion 1 of the ring 122
Since the rotary cylinder 126 is also rotated around the optical axis Z together with the ring 122 by the engagement of the groove portion 126b of the rotary cylinder 126 with the optical axis Z.
Is rotated about the center of the fixed cylinder 103 and is axially moved along a cam hole 103d formed in the cam hole forming portion 103c of the fixed barrel 103 to perform autofocusing.

On the other hand, when the lens barrel user wants to drive the lens holder 105 with the force of the fingertip without driving the lens holder 105 with the force of the ultrasonic motor 131, the focusing switch is not operated and the manual operation ring 104 is operated. It is rotated around the optical axis Z with a fingertip. Then, the ring 11
9 overcomes the frictional resistance with the spacer 123 and rotates about the optical axis Z. At this time, the ultrasonic motor 13
Since No. 1 is not driven, the rotating ring 112, which is the rotor of this ultrasonic motor, is stationary.

Therefore, the roller 120 is the ring 11
While being rotated by 9, it rolls along the end surface of the rotating ring 112. As a result, the ring 122 is rotated about the optical axis Z via the roller support shaft. Therefore, the rotation barrel 126 also rotates due to the engagement of the projection 122a and the groove 126d, and the lens holder 105 is rotated by the rotation barrel 12a.
6 is rotated by 6 to move axially along the cam hole 103d for manual focusing.

Embodiment 3 FIG. 5 is a longitudinal sectional view of an essential part showing a third embodiment of the lens barrel according to the present invention.

In FIG. 5, reference numeral 201 denotes a guide cylinder, which is a projection 201a for allowing only a radial rotation of a cam ring 202, which will be described later, and restricting movement of the cam ring 202 in the optical axis direction; have. A cam ring 202 is rotatably engaged with the guide cylinder 201, and is engaged with a cam 202a that engages with a driving roller 208, which will be described later, and an output ring 227, which will be described later, and a protrusion 202b that transmits rotational force.
have. A first group lens 203 moves in the optical axis direction during focusing to adjust the focus. The second lens group 204 is always fixed. 205 is a first group lens barrel,
It holds the first lens group, is fitted into the inner diameter of the guide cylinder 201, and is driven in the optical axis direction by a drive roller 208 which will be described later and is integrally attached. Reference numeral 206 holds the second group lens, holds the diaphragm unit 7, and guides the guide tube 201.
The second group lens barrel 208, which is integrally fixed to the first group lens barrel 208, is integrally attached to the first group lens barrel 205, and engages with the rectilinear groove 201b of the guide barrel 201 and the cam 202a of the cam ring 202, It is a drive roller that moves the first group lens barrel 205 back and forth in the optical axis direction when the cam ring 202 rotates. 209 is a mount that engages with a camera body (not shown), and 210 is a guide tube 20.
1 and a focus unit outer cylinder 212, which will be described later, are integrally fixed and a mount 9 is integrally attached. Reference numeral 211 denotes a focus unit outer cylinder 212 described later.
It is a focus operation ring rotatably engaged with and has a claw portion 211a that engages with a manual coupling ring 222 described later so as to transmit rotation.

Reference numerals 212 to 232 are focus units which constitute a focus drive actuator.
Is a focus unit outer cylinder that holds the individual components in the unit. The ultrasonic motor unit includes a ring-shaped vibrating member 213 (corresponding to a stator) including a ring having a trapezoidal cross section, an electrostrictive element 214 integrally formed with the vibrating member 213, and a pressure contact with the surface of the electrostrictive element 214. A ring-shaped vibration absorber 215 made of felt or the like, a first ring-shaped disc spring 216 that pushes the vibration absorber 215 toward the ring-shaped vibration member, and a first ring-shaped nut 217 screwed to the focus unit outer cylinder 212. The vibration member 2 that adjusts the pressing force on the ultrasonic motor side by adjusting the screwing position of the nut 217.
A detent 218 that engages with the groove of the vibration member 213 to restrict the rotation of the vibrating member 213, a circumferential moving member 219 pressed against the end surface of the vibrating member 213, and a rubber ring 220 that absorbs vibration from the circumferential moving member 219. It rotates integrally with the circumferential movement member 219 via the rubber ring 220, and the second
The connecting ring 229 is configured by an annular first connecting ring 221 having a claw 221a that transmits rotation to the connecting ring 229.

On the other hand, the manual input portion is engaged with the claw portion 211a of the focus operation ring 211, and the manual coupling ring 222 and the focus unit outer cylinder 21 to which the rotation is transmitted.
The rotation of the manual ring collar 223 is restricted by the rotation, is engaged in the optical axis direction in the front-rear direction, and is pressed against the end surface of the manual coupling ring 222, and the reinforcing plate 224 and the reinforcing plate 224 for increasing the rigidity of the manual ring collar 223. The second annular disc spring 225 and the focus unit outer cylinder 212 for urging the above-mentioned nut 217.
Similarly to the above, the second annular nut 226 and the like for adjusting the pressing force on the manual side by adjusting the screwing position of the nut 226 are configured.

The manual input section composed of the above parts constitutes a differential mechanism together with the parts 227 to 232 described later.

Reference numeral 227 is the projection 202 of the cam ring 202 described above.
b is an output ring that engages with b, and at least three support shafts 227 extending on a radial axis orthogonal to the optical axis.
An intermediate first roller 228 is rotatably engaged with the support shaft 227a. Reference numeral 229 is a second connecting ring having an engaging portion 229a that engages with the claw portion 221a of the above-mentioned first connecting ring 221, and the rotation is transmitted. The end surface of the second connecting ring 229 is pressed against the first roller 28. 230 is a bearing structure,
The inner ring is press-fitted into a fixed shaft 232, which will be described later, and the outer ring is a second roller that is freely rotatable via balls.
It is pressed against the end face of 21 and receives pressure from the ultrasonic motor section side. Reference numeral 31 is also a bearing structure, in which an inner ring is press-fitted into a fixed shaft 332, which will be described later, and an outer ring is a freely rotatable third roller, which is pressed against the end surface of the second coupling ring 229 to form a first roller. Pressure is applied from the manual input unit side via the roller 228. Reference numeral 332 is a fixed shaft that is axially supported by the focus unit outer cylinder 212 and projects toward the inner diameter direction at least at three locations on the radial axis that is orthogonal to the optical axis, and holds the second and third rollers described above.

The second roller 230 includes the second connecting ring 22.
9 is not in contact with the end surface of the third roller 231
It is not in contact with the end surface of the first connecting ring. With such a configuration, the pressure applied from each side of the ultrasonic motor unit and the manual input unit is not transmitted to the opposite side, and therefore, each pressure can be set to an optimum value. The output of can be efficiently transmitted.

Next, the operation of the lens barrel in this embodiment will be described.

First, in the autofocus mode, a voltage is applied to the electrostrictive element 214 by the operation of a control circuit (not shown), and as a result, a vibration that advances in the circumferential direction is generated in the vibrating member 213, and the vibration causes a circumferential direction. Moving member 21
9, the rubber ring 220, and the first connecting ring 221 rotate integrally. Further, the rotation of the claw portion 2 of the first connecting ring 221
It is also transmitted to the second connecting ring 229 via 21a and the engaging portion 229a of the second connecting ring. At this time, the outer ring of the second roller 230 which receives pressure from the ultrasonic motor side from the end surface of the first connecting ring 221 and the third roller 231 which receives pressure from the manual input side from the end surface of the second connecting ring 229.
The outer ring rotates around the fixed shaft 232.

The rotation of the second connecting ring causes the first roller 228 to receive a rotating torque, and the first roller 228 rotates around the support shaft 227a of the output ring 227 while rolling along the end surface of the stationary manual connecting ring 222. Then, along with this, the output ring 227 also rotates about the optical axis. Then, the rotation of the output ring 227 is rotated by the cam ring 20 via the protrusion 202b.
2 is also transmitted and autofocus is performed.

As is apparent from the above description, in this embodiment, the circumferential moving member 219 and the rubber ring 22 are used.
0, the first connecting ring 221, and the second connecting ring 229 constitute a rotor of the ultrasonic motor.

Next, the operation when the photographer manually focuses will be described. When the focus operation ring 211 is rotated, the rotation is transmitted to the manual connection ring 222, and the manual connection ring 222 rotates by overcoming the friction resistance with the manual ring collar 223. At this time, since the ultrasonic motor is not driven, the second connecting ring 22
9 is stationary, therefore the first roller 228 is rotated by the manual connecting ring 222 while the second connecting ring 2 is being rotated.
It rolls along the end face of 29. As a result, the output ring 2
27 is also rotated about the optical axis, and the rotation is transmitted to the cam ring 202 via the protrusion 202b, and manual focusing is performed. In the same configuration, the ultrasonic motor side is set with a pressurizing force so that the performance of the ultrasonic motor can be sufficiently brought out, while the manual input side is provided with a torque necessary to drive the lens group described above. In addition, the pressurizing force is set so that the frictional contact portion does not slip when configuring the differential mechanism.

By configuring the lens barrel as described above, the slip torque of the frictional contact of the differential mechanism can be set freely regardless of the performance of the ultrasonic motor, and the output of the ultrasonic motor can be made efficient. Good communication can be realized with a simple structure and assembly work.

The same effect can be expected by applying the lens barrel shown in the first to third embodiments to an optical device such as a camera.

[0076]

As described above, according to the lens barrel and the optical device of the present invention, the output of the ultrasonic motor can be efficiently transmitted.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a lens barrel according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a driving force generation unit according to the first embodiment.

FIG. 3 is a vertical sectional view showing a lens barrel according to a second embodiment of the present invention.

FIG. 4 is a vertical sectional view of a driving force generation unit according to the second embodiment.

FIG. 5 is a vertical sectional view showing a lens barrel according to a third embodiment of the present invention.

FIG. 6 is a vertical sectional view showing a conventional lens barrel.

[Explanation of symbols]

 6, 106, 213 Vibration member 8, 108, 216 First annular disc spring 11, 111, 217 First annular nut 12, 112 Rotating ring 14, 114, 219 Circumferential moving member 16, 116 Bearing ball 17, 117 First ball receiving ring 18,118 Second ball receiving ring 19,119 Manual operation force input ring 20,120 Roller 21,121 Roller support shaft 22,122,227 Output ring 24,125,225 Second annular dish Spring 25, 125, 226 Second annular nut 29, 131 Ultrasonic motor 30 Driving force generating unit 31, 133 Output member 221 First connecting ring 222 Manual connecting ring 228 First roller 229 Second connecting ring 230 Second Roller 231 Third roller 232 Fixed shaft

Claims (10)

[Claims] 1. A first rotary ring which rotates about an optical axis,
An ultrasonic motor having an annular rotor and a stator arranged concentrically with the optical axis, and a rotational force transmitted by the first rotating ring or the rotor, and rotating around a radial direction orthogonal to the optical axis. And a rotating member for rotating the rotating member around the optical axis by a differential mechanism configured by the first rotating ring, the ultrasonic motor, and the rotating member, and including the rotating member. In the lens barrel for rotating the second rotating ring around the optical axis, a first pressurizing unit that applies pressure to press the rotor and the stator of the ultrasonic motor into pressure contact, and the first rotating ring as the rotating member. And a second pressurizing means for applying a pressure to bring the lens barrel into pressure contact with the lens barrel. 2. The pressure of the second pressurizing means for preventing the pressure of the first pressurizing means from being transmitted to the rotary member and for receiving the pressure of the second pressurizing means via a part of the rotary member and the rotor. 2. A pressure transmission preventing means for preventing transmission to the contact surface between the rotor and the stator.
The lens barrel described. 3. The rotating member is a first roller,
3. The lens barrel according to claim 1, wherein the first rotating ring and the rotor transmit the rotating force to the first roller by a frictional force. 4. At least a part of the rotor that receives the pressure of the first pressurizing means is a bearing ring that constitutes a part of a radial ball bearing, and the pressure transmission preventing means is at least the radial ball bearing. The lens barrel according to claim 2, wherein the lens barrel is configured by: 5. A second roller which receives the pressure of the first pressurizing means and rotates about a rotation axis in a radial direction orthogonal to the optical axis and a pressure of the second pressurizing means. And a third roller that rotates about the same rotation axis as the second roller as a center, and the pressure transmission preventing means is composed of at least the second and third rollers and the rotation axis thereof. The lens barrel according to claim 2 or 3, characterized in that. 6. An ultrasonic motor comprising a first rotary ring rotating about an optical axis, an annular rotor and a stator arranged concentrically with the optical axis, and the first rotary ring or the rotor. A differential mechanism that includes a rotating member that receives a rotational force and that rotates about a radial direction that is orthogonal to the optical axis, and that includes the first rotating ring, the ultrasonic motor, and the rotating member. In the lens barrel that revolves the rotating member around the optical axis by rotating the second rotating ring including the rotating member around the optical axis, the pressure for pressing the rotor and the stator of the ultrasonic motor into pressure contact with each other. First pressurizing means for applying a pressure, second pressurizing means for applying a pressure to press the first rotary ring against the rotary member, and transmitting the pressure of the first pressurizing means to the rotary member. And the rotating member A lens barrel and having a pressure transmission preventing means for preventing the conveying pressure of the second pressurizing means received through a portion of the fine the rotor contact surface of the rotor and stator. 7. The rotating member is a first roller,
7. The lens barrel according to claim 6, wherein the first rotating ring and the rotor transmit the rotating force to the first roller by a frictional force. 8. The at least part of the rotor that receives the pressure of the first pressurizing means is a bearing ring that constitutes a part of a radial ball bearing, and the pressure transmission preventing means includes at least the radial ball bearing. The lens barrel according to claim 6, wherein the lens barrel is configured by: 9. A second roller which receives the pressure of the first pressurizing means and rotates about a rotation axis in a radial direction orthogonal to the optical axis, and a pressure of the second pressurizing means. And a third roller that rotates about the same rotation axis as the second roller as a center, and the pressure transmission preventing means is composed of at least the second and third rollers and the rotation axis thereof. 6. The method according to claim 6 or 7, wherein
The lens barrel described. 10. An optical device having the lens barrel according to claim 1. Description: