JPH10142470A - Optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the output torque of a driving unit large by providing a roller which has an abutting part for a rotating member on an oscillatory wave motor side and an abutting part for a manual coupling member having a smaller diameter than it. SOLUTION: The roller 22 has the 1st abutting part 22a with a large circumferential diameter that a coupling member 20 abuts against and the 2nd abutting part 22b with a small circumferential diameter that the manual coupling member 24 abuts against. An electrostrictive element 13 is applied with a voltage and the coupling member 20 is rotated on an optical axis. The roller 22 rolls along the end surface of the manual coupling member 24 and an output ring 21 also rotates on the optical axis. A cam ring 6 is driven through a projection 6b and a 1st group lens barrel 3 is driven along the optical axis. The rotation of a focus operation ring 9 is transmitted to the manual coupling member 24. The roller 22 rolls along the end surface of the coupling member 20 while rotating around an axis 21a on the output ring 21. The output ring 21 also rotates on the optical axis and the cam ring 6 is driven through the projection 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical apparatus having a vibration wave motor.

[0002]

2. Description of the Related Art Conventionally, a built-in ultrasonic motor as an annular vibration wave motor is constructed so that an auto focus operation and a manual focus operation can be performed almost continuously without a special switching operation. The applicant has proposed a lens barrel with a built-in ultrasonic motor for focusing, and some of the proposals have been commercialized by the present applicant.

[0003] Some lens barrels proposed by the present applicant utilize an actuating mechanism using a roller for a planetary mechanism. The rollers of the planetary mechanism have a rotation axis in the radial direction perpendicular to the optical axis, and output from the manual ring for performing the manual focus operation and output from the ultrasonic motor for performing the autofocus operation A planetary mechanism roller is arranged so as to be sandwiched between the end faces, an output ring is provided that rotates while picking up the revolution of the roller, and a differential mechanism that uses the rotation as a final output is configured.

When the rotation of the output ring is restricted, the manual ring is rotated when the rotation of the output ring is restricted so that excessive force is not applied to the mechanism even when the manual ring is rotated. In this case, the friction coefficient is set so that the roller and the output end face from the manual ring always slide out.

When the roller and the output end face of the rotor of the ultrasonic motor slide out first, the output end face of the rotor receives friction at one point due to the rotation of the roller without rolling, so that the output end face shows traces of wear. Will remain. On the other hand, if the roller and the output end face from the manual ring slide out first, the roller does not roll or rotate, and only the manual ring rotates, so the entire output end face of the manual ring receives friction with the roller and wear is reduced. Advantageous.

By driving the focusing lens with the output ring, the features of the structure of the ultrasonic motor can be fully utilized especially in manual focusing operation.

As is well known, an ultrasonic motor presses an annular rotor serving as an output member against an annular metallic elastic body (corresponding to a stator) on which a traveling wave is formed by a spring or the like. The rotor is pressed by a member, and the rotor is frictionally driven by a traveling wave formed on the elastic body.

In the above differential mechanism, the pressing force of the pressing member is maintained such that the manual ring maintains the non-rotating state even when the output member receiving the pressing force of the pressing member along the optical axis direction rotates. When performing manual focusing by rotating the manual ring, the rotor of the ultrasonic motor is pressed against the stator, so that the non-rotating state of the rotor is maintained, and any switching mechanism must be used. Switching between auto focus operation and manual focus operation.

However, in the conventional lens barrel having the above-described structure, a roller is used for a planetary mechanism in a differential mechanism for switching between a manual focus operation and an automatic focus operation without conversion, and both sides sandwiching the roller are used. The driving force is transmitted by frictionally contacting the output end surface of the ultrasonic motor and the output end surface of the manual focus ring, and the pressing force for the frictional contact is to press the rotor against the stator of the ultrasonic motor. Since the pressurization of the pressurizing member is used, the optimal pressing force that can bring out the performance of the ultrasonic motor is set.

Therefore, when driving a focus lens having a large lens load, slippage occurs in frictional contact with the roller, and the output from the ultrasonic motor cannot be transmitted efficiently, so that the lens can be driven sufficiently. There was a possibility that it could not be performed.

As a countermeasure, since the slip occurs first between the roller and the output end face of the manual ring, the coefficient of friction between the roller and the output end face of the manual ring is determined by determining the coefficient of friction between the roller and the rotor of the ultrasonic motor. It is sufficient to increase the friction coefficient in a range that is smaller than the friction coefficient with the output end face, but it is difficult to change the friction coefficient steplessly because it largely depends on the material of the surfaces in contact.

Therefore, in order to efficiently transmit the output of the ultrasonic motor, a pressing member for pressing the rotor and the stator of the ultrasonic motor, separately from the outer peripheral surface of the roller, the output end surface of the manual ring and the ultrasonic The ultrasonic motor is equipped with a pressurizing member to increase the driving force (hereinafter referred to as the slip torque), which is the maximum driving force that can be transmitted without causing slippage in the frictional contact between the output end faces of the motor. Apply the optimal pressing force that can be pulled out.

On the other hand, there has been proposed a configuration in which a pressing force capable of sufficiently generating a slip torque of a frictional contact between the outer peripheral surface of the roller, the output end surface of the manual ring, and the output end surface of the ultrasonic motor can be applied (hereinafter, referred to as a structure). Then, this configuration will be referred to as a pressure separation type.)

A conventional example will be described below with reference to FIG. 5 as an example.

FIG. 4 is a cross-sectional view of a conventional focus drive unit. Reference numeral 101 denotes a unit support cylinder for holding each component of the focus drive unit. 102
Is an annular vibrating body having a trapezoidal cross-sectional shape (hereinafter referred to as a stator). 103 is the stator 10
2 is an electrostrictive element that is joined to one end face of the vibration element 2 to vibrate the vibrating body.

Reference numeral 104 denotes an annular vibration absorber made of felt or the like pressed against the surface of the electrostrictive element 103. 105
Is a first pressing means and a first disc spring for urging the vibration absorber in the optical axis direction. 106 is screwed into a screw portion formed on the inner diameter of the unit support cylinder 101, and
This is the first nut for adjusting the pressing force of 05.

Reference numeral 107 denotes a detent for integrally holding the inner diameter of the unit support cylinder 101 and for restricting the rotation of the stator. Reference numeral 108 denotes a rotating body (hereinafter referred to as a rotor) as a contact body which receives a rotating force about the optical axis by the stator 102. 110102
Is a first connecting plate which rotates integrally with the rotor 108 via a rubber ring 109 and abuts on a first roller described later.

Reference numeral 111 is attached to the unit support tube 101 to support first and second rollers described later,
A plurality of roller support shafts projecting from the inner diameter of the unit support cylinder 101 toward the center of the optical axis. Numeral 112 denotes a first roller with which the first connecting plate 110 abuts and receives a pressure from the first pressing means. The first roller is separated into two parts, an inner diameter side and an outer diameter side, by a ball to eliminate rotation loss. It has a bearing structure to be engaged.

Reference numeral 113 denotes a second roller which is in contact with a second connecting plate 114 described later and receives a pressure from a second pressing means. And a bearing structure which is engaged by a ball. Reference numeral 114 denotes a third roller which will be described later abuts and is pressurized by the second pressurizing means, and is engaged with the pawl of the first connecting plate 110 to transmit rotation, and the same as the first connecting plate 110. It is a 2nd connection board rotated in a direction.

Reference numeral 115 denotes a plurality of shafts 115a extending radially with respect to the optical axis to rotatably support a third roller 116 described later.
The output ring is connected to a cam ring (not shown) to transmit the rotation about the optical axis. 116
Reference numeral denotes a third roller which is rotatably supported by the output ring 115, rolls between the second connecting plate 114 and a manual connecting plate 117 which will be described later, and revolves around the optical axis.

Reference numeral 117 denotes a manual connection plate to which rotation is transmitted from a focus ring (not shown). The manual connection plate 117 is pressurized by a second pressurizing means, which will be described later, and one end surface thereof is in contact with the third roller 116.

The material of the manual connection plate is such that the friction coefficient between the third roller 116 and the manual connection plate is smaller than the friction coefficient between the third roller 116 and the second connection plate 114. Is selected. 11
Reference numeral 8 denotes a holding ring which is pressed by a second pressing means to be described later and is brought into contact with the manual connection plate, and is fitted to the unit main body so as to restrict rotation.

Reference numeral 119 denotes a reinforcing plate for the holding ring. 120
Is a second pressing means, and is a second disc spring for urging the manual connecting plate toward the third roller in the optical axis direction. Reference numeral 121 denotes a second nut that is screwed into a screw portion formed on the inner diameter of the unit support cylinder and adjusts the pressing force of the disc spring 120.

However, in the conventional pressure separation type, a pressure separation section (first roller in the conventional example) for receiving pressure from the ultrasonic motor side and pressure from the manual ring side, respectively. 112, second roller 1
13) is arranged in parallel in the optical axis direction between the ultrasonic motor unit and the manual connection unit, so that the length of the thrust of the unit is long.

Therefore, the present applicant further solves the above problem by using the slip torque of the frictional contact between the outer peripheral surface of the roller and the output end surface of the ultrasonic motor to determine the friction between the outer peripheral surface of the roller and the output end surface of the manual ring. We focused on the fact that the slip torque of the contact was smaller, and the gap between the outer peripheral surface of the roller and the output end surface of the manual ring always slipped.

The configuration of the drive unit is such that a manual rotation is transmitted to a drive unit in a lens barrel having a built-in ultrasonic motor including an annular stator and a rotor member arranged concentrically with the optical axis of the lens. The connecting member and the lens are arranged at least at three or more positions around the optical axis of the lens, and are rotatable about a radial axis orthogonal to the optical axis, and are arranged on the ultrasonic motor side. And a first roller that rolls between the manual connecting members.

An output ring that supports the first roller and rotates by being revolved around the optical axis of the first roller, between the rotor end face of the ultrasonic motor and the end face of the stator, and A first pressing member that presses the outer peripheral surface of the first roller and the end surface of the rotor member, and a second pressing member that presses the outer peripheral surface of the first roller and the end surface of the manual connection member. And a second roller disposed on the output ring, urged by the second pressure member through the first roller and the output ring, and pressed against the end face of the fixed portion. I made it.

With the above configuration, the slip torque of the frictional contact between the outer peripheral surface of the roller and the output end surface of the manual ring is increased within a range smaller than the slip torque of the frictional contact between the outer peripheral surface of the roller and the output end surface of the ultrasonic motor. It has been proposed that the thrust dimension of the drive unit be reduced by making it adjustable.

An example will be described with reference to FIG.

FIG. 6 is a cross-sectional view of the focus drive unit. 201 is a unit support cylinder for holding each component of the focus drive unit. Reference numeral 202 denotes an annular vibration member having a trapezoidal cross section (hereinafter referred to as a stator). Reference numeral 203 denotes an electrostrictive element that is joined to one end surface of the stator 202 and vibrates. 2
Reference numeral 04 denotes an annular vibration absorber made of felt or the like pressed against the surface of the electrostrictive element 203.

Reference numeral 205 denotes a first pressurizing means, which is a first disc spring for urging the vibration absorber in the optical axis direction. Reference numeral 206 denotes a first nut which is screwed into a screw portion formed on the inner diameter of the unit support cylinder and adjusts the pressing force of the disc spring 205, and is an optimal nut for maximizing the performance of the ultrasonic motor. Adjusted by pressurization.

Reference numeral 207 denotes a detent for integrally holding the inner diameter of the unit body and for restricting the rotation of the stator 202. Reference numeral 208 denotes a rotating body (hereinafter, referred to as a rotor) that receives a rotational force about an optical axis from a vibration wave generated in the stator.

Reference numeral 210 denotes a connecting plate which rotates integrally with the rotor via a rubber ring 209 and is brought into contact with a first roller described later. 211 is a first roller 21 described below.
A plurality of shafts 211a extending substantially equally in the radial direction with respect to an optical axis rotatably supporting the second roller 213;
It is an output ring that has a 211b and is connected to a cam ring (not shown) to transmit rotation.

A plurality of 212s are arranged on the output ring 211, rotatably supported by the shaft 211a, and rolled by being sandwiched between the connecting plate 210 and a manual connecting plate 214 which will be described later, and revolve around the optical axis. The first roller. 213 is supported by a plurality of shafts 211b arranged on the output ring 211,
The first roller 21 is separated from a manual connecting plate described later.
2. The second roller is a second roller that is urged against the end face of the inner diameter projection 201a of the unit support cylinder by receiving pressure from a second pressure unit described below that is applied through the output ring 211. In order to eliminate this, the inner and outer diameter sides are split into two parts and connected by bearing balls.

The second roller 213 is arranged at the same position in the optical axis direction on the output ring 211 so as not to interfere with the first roller 212, but is arranged at a different phase in the radial direction. . Reference numeral 214 denotes a manual connection plate to which rotation is transmitted from a focus ring (not shown). One end surface of the manual connection plate is brought into contact with the first roller under pressure by a second pressure unit described later.

The material of the manual connection plate 214 is selected so that the friction coefficient between the first roller 212 and the manual connection plate 214 is smaller than the friction coefficient between the first roller 212 and the connection plate 210. Have been.
Reference numeral 215 denotes a holding ring that is pressed by a second pressing unit described below and abuts on the manual connection plate 214, and is fitted to the unit support cylinder so that rotation is restricted.

Reference numeral 216 is a reinforcing plate for the holding ring. 217
Is a second pressing means, and is a second disc spring for urging the manual connecting plate toward the first roller in the optical axis direction.

Reference numeral 218 denotes a second nut which is screwed into a screw portion formed on the inner diameter of the unit main body and adjusts the pressing force of the disc spring 217. In a range smaller than the slip torque due to the frictional contact of the first roller 212 and the end face of the manual connection plate 214, the pressure applied by the first pressing means is larger than that of the first pressing means so that the slip torque caused by the frictional contact between the first roller 212 and the end face of the manual connection plate 214 becomes as large as possible. Has been adjusted.

[0039]

However, even in the above proposal, the manual side slip torque is merely increased in the range of the ultrasonic motor side slip torque already determined from the pressurization of the ultrasonic motor. , The output torque was limited.

[0040]

According to a first aspect of the present invention, there is provided a vibrating body and a contacting body which are brought into contact by being urged in substantially the same direction as the optical axis of the lens, and use the relative rotational movement of both. An optical device provided with a vibration wave motor for moving a lens, wherein a manual coupling member to which rotation of a manual operation member is transmitted and a radial axis orthogonal to the optical axis are rotatable; A first contact portion having a different outer diameter, and a second contact portion having a smaller diameter than the first contact portion. An output member that pivotally supports a first roller having an abutting portion and that is rotated by being revolved around the optical axis of the first roller; and between the vibrating body and the contact body of the vibration wave motor. And a first abutment of the first roller A first pressing unit that presses the outer periphery and the rotating member, a second pressing unit that presses the outer periphery of the second contact portion of the first roller and the manual connection member, A receiving member that receives the movement of the output member at the pressure of the pressurizing means, and brings the first contact portion of the first roller into contact with the rotating member of the vibration wave motor, The optical device is characterized in that two contact portions are in contact with the manual connection member.

According to a second aspect of the present invention, the output member is rotatable about the radial axis so that the output member is brought into contact with the receiving member to receive the pressure of the second pressing means by the receiving member. An optical device provided with a second roller described above.

According to a third aspect of the present invention, there is provided an optical apparatus in which the pressure by the second pressing means is larger than the pressure by the first pressing means.

With the above arrangement, the reduction ratio of the revolution of the roller with respect to the rotation of the rotating member on the vibration wave motor side is increased without changing the pressure from the vibration wave motor side, and While increasing the drive output due to the revolution of the roller, the pressure on the manual side is increased to increase the slip torque of the frictional contact between the roller and the manual coupling member, and the drive unit is measured while measuring the output torque of the drive unit. Can be shortened.

[0044]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 is a sectional view of a lens barrel as an optical device using a drive unit according to an embodiment of the present invention. Reference numeral 1 denotes a focusing lens group as a moving lens. Reference numeral 2 denotes a fixed lens group. Reference numeral 3 denotes a lens barrel for holding the focusing lens group 1 and a guide cylinder 5 and a cam cylinder 6 described later.
Is a first lens barrel having a driving roller 3a that engages with the first lens barrel.

Reference numeral 4 denotes a second lens barrel for holding the fixed lens group 2, which is integrally held by a guide cylinder 5 described later. A guide tube 5 slidably supports the first lens barrel 3 in the optical axis direction. The guide tube 5 rotatably supports a cam ring 6 to be described later, and has a claw 5a for regulating movement in the optical axis direction and a driving member. It has a rectilinear groove 5b with which the roller 3a engages.

Reference numeral 6 denotes a driving roller 3a for the first group barrel 3, which is rotatably engaged with the guide cylinder 5 by the above-mentioned claw 5a.
Is a cam ring having a cam 6a to be engaged, and a projection 6b to be engaged with an output ring 21 of a focus drive unit to be described later to transmit rotation. Reference numeral 7 denotes an aperture unit which is held by the second lens barrel 4.

Reference numeral 8 denotes a fixed cylinder to which a mount 10 to be described later is integrally attached, and which holds the guide cylinder 5 and a unit support cylinder 11 for a focus drive unit to be described later. Reference numeral 9 denotes a focus operation ring as a manual operation member, which is rotatably held by a unit support cylinder 11 of a focus drive unit described later, and transmits rotation to a manual connection plate 24 of the focus drive unit via a connection claw 9a. .

A mount 10 is attached to the above-mentioned fixed cylinder 8 and mechanically connected to a camera body (not shown).

Reference numerals 11 to 28 denote components constituting the focus drive unit, and reference numeral 11 denotes a unit support cylinder for holding each component of the focus drive unit, which is held by a fixed cylinder 8 as a fixing member. Reference numeral 12 denotes an annular vibrating body having a trapezoidal cross section (hereinafter referred to as a stator).

Numeral 13 denotes an electrostrictive element which is joined to one end face of the stator 12 and serves as an electromechanical energy converting element for vibrating. Reference numeral 14 denotes an annular vibration absorber made of felt or the like pressed against the surface of the electrostrictive element 13. 1
Reference numeral 5 denotes a pressure spring as first pressure means, specifically, a first disc spring for urging the stator 12 forward in the optical axis direction via the vibration absorber 14.

Numeral 16 denotes a first nut which is screwed into a thread formed on the inner diameter of the unit support cylinder 11 and adjusts the pressing force of the disc spring 15, and which is an ultrasonic wave as a vibration wave motor which is a driving source. Adjust with the optimal pressurization to maximize the motor performance. Reference numeral 17 denotes a detent that is integrally held by the inner diameter of the unit body and restricts rotation of the stator 12.

Reference numeral 18 denotes a contact body that comes into contact with the stator, and is a rotating body (hereinafter, referred to as a rotor) that receives a rotational force about the optical axis by the vibration wave of the stator 12.
Reference numeral 20 denotes a connecting member that rotates integrally with the rotor 18 via the rubber ring 19 and is a rotating member that comes into contact with a first contact portion 22a of a first roller described below.

A plurality of shafts 21a and 21b extend substantially equally in the radial direction with respect to an optical axis rotatably supporting a first roller 22 and a second roller 23 which will be described later (a perspective view in FIG. 3). ) And an output ring as an output member having a projection 21c for transmitting rotation to the cam ring 6.

Reference numeral 22 denotes a first shaft rotatably supported by a plurality of shafts 21a arranged on the output ring 21 and rolling between the connecting member 20 and a manual connecting member 24, which will be described later, and revolving around the optical axis. A first contact portion (outer diameter φA1) 22a having a large outer diameter with which the connecting member 20 comes into contact, and a second contact portion (outer periphery) with a small outer diameter with which the manual connecting member 24 comes into contact (Diameter φA2) 22b.

A plurality of reference numerals 23 are disposed on the output ring 21 and supported by the shaft 21b. The second roller 23 is applied from a manual connecting plate, which will be described later, via the first roller 22 and the output ring 21 to be described later. The second roller is a second roller that is urged against the end face of the inner diameter projection 11a of the unit support cylinder by receiving pressure from the pressure means. As will be described later, since the second pressure is larger than the first pressure, the second roller 23 is always received in a state of being urged by the inner diameter projection 11a as a receiving portion. The unit support cylinder 11 corresponds to a receiving member.

The second roller 23 is arranged at the same position in the optical axis direction on the output ring 21 but at a different phase in the radial direction so as not to interfere with the first roller 22. . Reference numeral 24 denotes a manual connection member to which rotation can be transmitted from the focus operation ring 9, which is pressurized by a second pressurizing means to be described later, and one end surface of which is brought into contact with a second contact portion 22b of the first roller. Touched.

The material of the manual connection plate is selected so that the friction coefficient between the first roller 22 and the manual connection plate is smaller than the friction coefficient between the first roller 22 and the connection member 20. I have. Reference numeral 25 denotes a holding ring which is pressurized by a second pressurizing means to be described later and is brought into contact with the manual connection plate, and is fitted to the unit support cylinder so as to restrict rotation. 26 is a reinforcing plate of the holding ring.
Reference numeral 27 denotes a pressure spring as a second pressing means, specifically, a second disc spring for urging the manual connection plate toward the first roller in the optical axis direction.

Reference numeral 28 denotes a second nut which is screwed into a screw portion formed on the inner diameter of the unit main body and adjusts the pressing force of the disc spring 27. The second nut 28 is provided between the first roller 22 and the connecting member 20. With a pressure larger than that of the first pressing means, the slip torque due to the frictional contact between the first roller 22 and the end face of the manual connection plate 24 is as large as possible within a range smaller than the slip torque due to the frictional contact. Has been adjusted.

Next, the operation of the lens barrel in which the focus drive unit having the above structure is disposed will be described.

When the user operates a focusing switch (not shown) in the auto focus mode, a voltage is applied to the electrostrictive element 13 via a printed circuit board (not shown) by the operation of a control circuit (not shown). A vibration wave traveling in the circumferential direction is generated in the stator 12, and the vibration of the stator 12 causes the rotor 18, the rubber ring 19, the connecting member 20
Is rotated about the optical axis.

This rotation causes the first roller 22 to receive a rotational torque.
4 does not rotate, the first roller 22 rotates around the shaft 21a on the output ring while the manual connecting plate 2 rotates.
4, and the output ring also rotates about the optical axis via the shaft 21a. As a result, the cam ring 6 is
b, the first lens barrel 3 is driven in the direction of the optical axis, and the focus lens group 1 is moved in the direction of the optical axis, thereby performing auto-focusing.

On the other hand, when the user focuses manually, if the focus operation ring 9 is rotated without operating the focusing switch (not shown), the rotation is transmitted to the manual connecting member 24.

At this time, since the ultrasonic motor section is not driven, the connecting member 20 is stationary, and if the first roller 22 rotates around the shaft 21a on the output ring, the connecting member 20 is not driven. Rolls along the end face, and the output ring also
Rotate about the optical axis via the. Thereby, the cam ring 6
Is driven through the projection 6b, and accordingly, the first lens barrel 3 is driven in the optical axis direction to perform manual focusing.

Further, how the driving force from the ultrasonic motor side or the manual side is transmitted to the output ring 21 in the above embodiment will be described with reference to FIG.

FIG. 2 is a developed view of the vicinity of the first roller 22 as viewed from the axial direction of the roller. When the driving force on the ultrasonic motor side or the manual side is sufficient, the output ring 2
If the force required to drive the first roller is F, no slippage occurs between the connecting member 20 and the first contact portion 22a of the first roller, and the ultrasonic motor side or the manual side In order to transmit the rotation, the following conditions are required.

F1: Pressing force by first pressurizing means μ1: Friction coefficient between connecting member 20 and first roller μ1 × F1> F × A2 / (A1 + A2) (axial loss of inner diameter of first roller 22) , The axial loss of the second roller 23 is ignored in the above equation because it is small.)

Further, the following conditions are required to prevent the slippage between the manual connecting member 24 and the second contact portion 22b of the first roller.

F2: Pressure by the second pressing means μ1: Friction coefficient between the manual connecting member 24 and the first roller μ2 × F2> F × A1 / (A1 + A2) (the shaft of the inner diameter of the first roller 22) The loss and the axial loss of the second roller 23 are ignored in the above equation because they are small.)

From the above two conditional expressions, the pressing force by the first pressing means is kept as it is (the pressing force is set to an optimum value to bring out the performance of the ultrasonic motor), and the first roller 2
The outer diameter A1 of the first contact portion 22a and the second contact portion 2a
By increasing the ratio of the outer ring 2b to the outer diameter A2 and increasing the pressing force by the second pressurizing means, the output ring 21
Can be increased.

(Second Embodiment) FIG. 4 is a sectional view of a lens barrel according to a second embodiment.

In the figure, reference numerals 1 to 21 and 24 to 28 denote the same elements as those in the first embodiment shown in FIG.
Only 1 and 52 have a different configuration from the first embodiment.

Reference numeral 51 denotes a first roller corresponding to the first roller 22 in the first embodiment. The first roller 51 is supported by a plurality of shafts 21 a arranged on the output ring 21, and is connected to the connecting member 20. A first abutting portion (outer diameter φA) having a large outer diameter with which the connecting member 20 abuts while rolling and revolving around the optical axis while being sandwiched between manual connection members 24 described later.
1) There is a second contact portion (outer diameter φA2) 51b having a small outer diameter where the 51a and the manual connecting member 24 come into contact.

Further, in the second embodiment, the first roller 51 has a two-body structure of an inner diameter side 51c and an outer diameter side 51d in order to eliminate a shaft loss with the shaft 21a on the output ring 21. , And are connected by a bearing ball 51e.

Reference numeral 52 denotes a second roller corresponding to the second roller 23 in the first embodiment. The second roller 52 is rotatably supported by a plurality of shafts 21b arranged on the output ring 21. The first roller 51 receives the pressure from the second pressing means applied via the output ring 21 and is urged against the end face of the inner diameter projection 11a of the unit support cylinder.

Further, in the second embodiment, the second roller 52 has a two-body structure of an inner diameter side 52a and an outer diameter side 52b in order to eliminate a shaft loss with the shaft 21b on the output ring 21. , And are connected by a bearing ball 52c.

As described above, the first roller 51 and the second roller 52 are connected to each other by the bearing ball, so that the shaft loss is eliminated and the driving torque is further improved.

[0077]

According to the first aspect of the present invention, the reduction ratio of the revolution of the roller to the rotation of the rotating member on the vibration wave motor side is increased without changing the pressurization from the vibration wave motor side. The drive output due to the revolution of the roller with respect to the input of the UP is increased, while the pressure on the manual side is increased to increase the slip torque of the frictional contact between the roller and the output member on the manual side. An optical device capable of driving torque can be provided.

According to the second aspect of the present invention, since the pressure of the second means on the manual side is received by the roller, the loss can be reduced.

According to the third aspect of the present invention, the second pressurization on the manual side is made larger than the first pressurization on the vibration wave motor side, so that a larger output torque can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a partial development view of the lens barrel of FIG. 1;

FIG. 3 is a partial perspective view of the lens barrel of FIG. 1;

FIG. 4 is a cross-sectional view of a lens barrel as a second embodiment of the present invention.

FIG. 5 is a transverse sectional view showing a conventional lens barrel.

FIG. 6 is a transverse sectional view showing a lens barrel which is a premise of the invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 focus lens group 2 fixed lens group 3 first group barrel 4 second group barrel 5 guide barrel 6 cam ring 7 aperture unit 8 fixed barrel 9 focus operating ring 10 mount 11 unit support barrel 12 stator 13 electrostrictive element 14 vibration Absorber 15 First disc spring 16 First nut 17 Detent 18 Rotor 19 Rubber ring 20 Connecting member 21 Output ring 22 First roller 23 Second roller 24 Manual connecting member 25 Holding ring 26 Reinforcing member 27 Second Disc spring 28 second nut

Claims (3)

[Claims] 1. A vibration wave motor that has a vibrating body and a contacting body that are brought into contact by being urged in substantially the same direction as the optical axis of a lens, and that moves the lens using a relative rotational movement of both. An optical device, wherein a manual connection member to which rotation of a manual operation member is transmitted, and a manual connection member rotatable around a radial axis orthogonal to the optical axis and rotating on a vibration wave motor side; A first roller having a first contact portion having a different outer diameter and a second contact portion having a diameter smaller than that of the first contact portion, which is rolled by being sandwiched between members. An output member for supporting and rotating the orbit about the optical axis of the first roller, and a first contact between the vibrating body and the contact body of the vibration wave motor and the first roller of the first roller. A pressure contact is made between the outer periphery of the contact portion and the rotating member. First pressurizing means, a second pressurizing means for press-contacting between the outer periphery of the second contact portion of the first roller and the manual connecting member, and the pressure of the second pressurizing means. A receiving member for receiving the movement of the output member,
An optical device, wherein the first contact portion of the first roller is brought into contact with the rotating member of the vibration wave motor, and the second contact portion is brought into contact with the manual connection member. . A second output member which is rotatable about the radial axis, and which is brought into contact with the receiving member to receive the pressure of the second pressurizing means by the receiving member. 2. A roller is provided.
The optical device as described. 3. The optical apparatus according to claim 1, wherein a pressure applied by the second pressure unit is larger than a pressure applied by the first pressure unit.