JP4710527B2 - Drive mechanism and device provided with drive mechanism - Google Patents

Description

The present invention relates to a driving mechanism for driving a driven body toward a target position, in particular, a lens driving mechanism that can be used for, for example, a lens driving device that drives a lens in a camera toward a target position for focus adjustment, and the lens driving mechanism. For example, the lens driving device, the camera including the lens driving device, and the device including the camera.

A drive mechanism that drives a driven body toward a target position is used in various fields.
Taking a lens driving device in a camera in which the driven body is a lens or a cylindrical body holding a lens, for example, Japanese Utility Model Laid-Open No. 62-109129 discloses an optical axis with a driving force of an ultrasonic motor. A rotating ring that can rotate at a fixed position around is rotated, and a helicoid cylinder that is screwed into a helicoid provided on the inner periphery of the rotating ring is moved back and forth in the optical axis direction as the rotating ring rotates. A lens barrel is described in which an aperture unit and an electromagnetic motor that drives the aperture unit are arranged on the inner periphery of the helicoid cylinder.

  Japanese Patent Laid-Open No. 2-253214 discloses that the rotor end surface of the motor is pressed from one side to the outer peripheral surface of three or more cylindrical rollers that rotate about a radial axis orthogonal to the optical axis. At the same time, the manual change ring is pressed from the opposite side, and the cylindrical roller is rotated by the rotation of the motor rotor or the manual change ring, thereby rotating the support ring carrying the cylindrical roller. It is described that the lens is moved in the optical axis direction via a helicoid or the like by rotating the carrier ring.

  During autofocusing, the rotor rotates while the manual operation ring is stopped, whereby the cylindrical roller rolls and the carrier ring rotates. During manual operation, the rotor is stopped, while the manual operation ring is rotated, whereby the cylindrical roller rolls and the carrying ring rotates.

  In Japanese Patent Laid-Open No. 61-86718, a switching mode can be switched between a driving mode for driving the photographing lens by the rotational force of the surface wave motor and a manual mode for driving the photographing lens by manual operation of the manual operation member. In the manual mode, a mechanism is described in which the stator and the mover of the surface wave motor are integrated and rotated in conjunction with the manual operation member.

Here, an outline of the lens barrel described in the above-mentioned JP-A-2-253214 will be described with reference to FIG.
In FIG. 8, 101 is a mount for attaching / detaching the lens barrel to / from the camera body, and 127 is a back cover attached to the inner diameter side of the mount. Reference numeral 103 denotes a guide tube attached to the mount 101, and reference numeral 105 denotes a focus lens supported by the guide tube. Reference numeral 130 denotes a structural part connected to the guide cylinder 103 and a fixed cylinder that also has the appearance of the lens barrel.

  The guide tube 103 is fixed to the fixed tube and the motor unit main body 131 with screws or the like, and the outer peripheral portion of the focus lens barrel 104 holding the focus lens 105 is slidably fitted on the inner peripheral side. is doing. The guide tube 103 has a cam 103a for feeding out the focus lens, and the outer peripheral surface of several rollers 106 attached in the radial direction from the outer peripheral surface of the focus lens barrel and the cam surface of the cam 103a slide. It is possible.

A motor unit main body 131 is fixed to the fixed cylinder 130 and the guide cylinder 103 with screws or the like. 109 to 119 are components of the motor unit.
Reference numeral 112 denotes an annular stator that is a vibrator, and reference numeral 113 denotes a rotor that contacts the stator 112 under pressure. The rotor 112 rotates around the optical axis by the vibration of the stator 112. 111 is a vibration absorbing material for not transmitting the vibration of the stator 112 to the outside, 110 is a flat spring, 109 is a pressure adjusting ring, and 114 is a vibration absorbing material for absorbing the vibration of the rotor 113.

  Reference numeral 115 denotes a communication ring, which supports the rotor 113 and the vibration absorbing material 114, and is in contact with the outer peripheral surface of the roller 117 functioning as a planetary roller at the opposite end surface. The roller 117 is supported by the roller ring 116 so as to be rotatable about the axis passing through the intersection with the optical axis of a plane perpendicular to the optical axis, and the washer 118 restricts the movement in the rotation axis direction. The roller ring 116 is fitted to the motor unit main body 131 on the inner peripheral side.

  Reference numeral 119 denotes a manual input ring, which is supported by the motor unit main body 131 so as to be rotatable about the optical axis, and is in contact with the outer peripheral surfaces of the plurality of rollers 117. Further, an uneven portion 119a is formed on the outer peripheral portion of the manual input ring 119, meshes with the uneven portion 132a on the inner peripheral side of the manual ring 132, and rotates integrally. The manual ring 132 is engaged with the fixed cylinder 130 and the motor unit main body 131, and is supported rotatably about the optical axis. Reference numeral 107 denotes a focus key, one end of which is fixed to the roller ring 116 and passes through the opening 131a of the motor unit main body 131 to restrict the rotation direction of the roller 106 around the optical axis. Reference numeral 128 denotes an electric circuit board of the lens barrel, which also controls a motor and the like.

Next, the operation will be described. Since the operation principle of the motor is well known, the description of the operation is omitted, and an outline of the entire operation will be described.
First, when the stator 112 is supplied with electric power and vibrates, the rotor 113, the vibration absorbing material 114, and the communication ring 115 are integrally rotated about the optical axis. Then, a force that the roller 117 in contact with the communication ring 115 tries to rotate about the center of the attachment shaft is applied. Since the manual input ring 119 is held on the end surface of the motor unit main body 131 by frictional force, the roller 117 moves by rolling contact on the end surface of the manual input ring 119, and the roller ring 116 supporting the roller 117 is supported on the optical axis. Rotate to center. The rotation amount is ½ times the rotation amount of the rotor.

  The amount of rotation of the roller ring 116 is transmitted to the focus lens 105 and the focus lens barrel 104 via the roller 106 by the focus key 107. There is a cam 103a on the guide tube 103, and a roller 106 is engaged. As the focus key 107 rotates, the roller 106, the focus lens barrel 104, and the focus lens 105 rotate about the optical axis in the optical axis direction. Move and focus.

  Further, when the manual ring 132 is rotated, the inner diameter side unevenness 132 a and the manual input ring 119 outer peripheral surface unevenness 119 a are engaged with each other, so that the manual input ring 119 is rotated about the optical axis, and this rotational force is the axial center of the roller 117. At this time, the contact ring 115, the rotor 113, and the like are held by the frictional force acting between the rotor 113 and the stator 112, and therefore do not rotate. Therefore, the roller ring 116 is 1 of the rotation amount of the manual ring 132. This is rotated by a rotation amount of / 2, which is transmitted to the focus lens 105 via the focus key 107, and manual focusing is performed.

Japanese Utility Model Publication No. 62-109129 JP-A-2-253214 JP-A-61-86718

  However, according to the lens barrel described in Japanese Utility Model Laid-Open No. 62-109129, when it is desired to finely adjust the focus manually after the automatic focus adjustment, the ultrasonic motor stator and mover are forcibly slid by manual operation. May be required and may damage the sliding surface of the motor.

  According to the mechanism described in Japanese Patent Laid-Open No. 61-86718, the camera operator needs to perform switching operation by switching means between automatic focus adjustment and manual focus adjustment, and fine adjustment manually after automatic focus adjustment. You cannot do what you do immediately.

  In this regard, in the mechanism described in Japanese Patent Laid-Open No. 2-253214, the driving force input from the ultrasonic motor and the driving force input from the manual operation ring are switched by the differential planetary roller, and the driving force is applied to the output member. By transmitting, automatic / manual operation can be switched immediately.

  However, in this configuration, since the driving force input from the ultrasonic motor is always transmitted as a friction force to the planetary roller, a transmission loss due to friction transmission occurs. The planetary roller is also in frictional contact with the manual input ring, and there is a frictional load although it is rolling contact. Further, since the roller ring that supports the planetary roller is held by the bearing portion with respect to the fixed cylinder, a frictional load is generated in the bearing portion when the roller ring rotates. As a result, the motor driving force is inevitably increased because the frictional load is added to the output member driving torque to provide a margin, the motor becomes larger, and the power consumption increases.

Therefore, the present invention employs a driving force generating means for generating a driving force by electric power as the first driving force generating means and a manual operation means as the second driving force generating means, and directs the driven body to the target position. lens driving mechanism for driving, for example, a lens driving mechanism available to the lens driving device for driving toward the target position for focusing the lens in the camera, the switching of the first, second driving force generating means It can be used easily and instantly, and the driving force loss in the driving force transmission path from the driving force generating means to the driven body is suppressed, thereby improving the driving force transmission efficiency and the smaller size. size of the reduction and the lens driving mechanism of the power consumption by adopting the driving force generating means, to provide a lens driving mechanism which can thus reduce the size of apparatus that use the lens driving mechanism The first problem that.

The present invention, by providing such a lens driving mechanism, device it is possible to reduce and apparatus size reduction of the power required to drive toward the driven member to the target position (e.g., a lens driving device, the lens A second object is to provide a camera including a driving device and a device such as a device including the camera.

The present inventor repeated research to solve the above problems and obtained the following knowledge and idea.
That is, transmitted to the drive force from the two driving force generating means (e.g., the rotational force of the motor and manual control rotational force by the member) selectively one of the driven member (e.g., rotary cylinder is driven body) In the case of the driving mechanism, the first driving force generating means and the driven body are coupled so that the driving force is directly transmitted, and the first driving force is generated by the driving force from the second driving force generating means. If the driving force generating means and the driven body are integrally driven, the driving force transmission loss is reduced, the driving force transmitting efficiency is improved, and the driving force generating means is reduced in size and driving force. It is possible to stabilize the driving force from the generating means and to save power . In addition, the first and second driving force generating means can be switched and used easily.

  Such a drive mechanism can be used for driving a driven body toward a target position in various devices. For example, it can be used for focus drive of a lens barrel of a camera, and by doing so, the auto focus operation and the manual focus operation can be easily and continuously switched without using a special switching member. And stabilization of the autofocus operation can be achieved.

The present invention provides the following first and second lens driving mechanisms based on such knowledge and idea.
(1) a first lens driving mechanism, a fixed body;
Driving force generating means for generating driving force by electric power;
Manual operation means for generating a driving force by frictional contact with the fixed body and being manually operated;
A driven member that is engaged with the driving force generation unit and is installed so as to move integrally with the driving force generation unit with respect to the fixed body by any driving force of the driving force generation unit or the manual operation unit. Body,
The driving force generating means is coupled to the manual operating means so as to move integrally with the manual operating means with respect to the fixed body, and is movable relative to the driving force generating means. And a relative driving member that is frictionally coupled to the lens driving mechanism,
When the driving force generating means generates a driving force, the relative movement member and the manual operating means are stationary by the driving force and a static frictional force between the manual operating means and the fixed body. When the driven body moves integrally with the driving force generation means and the manual operation means generates a driving force, the driving force and a static friction force between the relative movement member and the driving force generation means Therefore, the driving force is transmitted to the driving force generating means via the relative movement member, and the driving force generating means and the driven body are integrally moved .
Here, the “driven body” is a member that directly or indirectly receives the driving force from the driving force generating means and moves integrally with the driving force generating means. Rather, it is a lens itself or a member related to lens driving that directly or indirectly receives the driving force from the driving force generating means, and specifically rotates by receiving the driving force from the driving force generating means directly. And a rotating cam cylinder.

(2) a second lens driving mechanism, a fixed body,
Driving force generating means for generating driving force by electric power;
Manual operation means for generating a driving force by frictional contact with the fixed body and being manually operated;
A driven member that is engaged with the driving force generation unit and is installed so as to move integrally with the driving force generation unit with respect to the fixed body by any driving force of the driving force generation unit or the manual operation unit. Body,
The driving force generating means is coupled to the manual operating means so as to move integrally with the manual operating means with respect to the fixed body, and is movable relative to the driving force generating means. A relative moving member frictionally coupled to ,
A planetary rotator having a rotation shaft in the relative movement member and rotationally coupling between the manual operation member and the fixed body, and moves around the rotation shaft while moving with the relative movement member via the rotation shaft. A planetary rotating body installed so as to be rotatable, and a lens driving mechanism,
When the driving force generating means generates a driving force, the relative moving member, the planetary rotating body, and the manual operating means are caused by the driving force and a static frictional force between the manual operating member and the fixed body. When the driven body moves integrally with the driving force generation means in a stationary state and the manual operation means generates a driving force, the driving force, the relative movement member, and the driving force generation means The driving force is transmitted via the planetary rotating body and the relative moving member by a static frictional force therebetween, and the driving force generating means and the driven body move integrally. Drive mechanism.
Here, the “driven body” is a member that directly or indirectly receives the driving force from the driving force generating means and moves integrally with the driving force generating means. Rather, it is a lens itself or a member related to lens driving that directly or indirectly receives the driving force from the driving force generating means, and specifically rotates by receiving the driving force from the driving force generating means directly. And a rotating cam cylinder.

In these first and second drive mechanisms, “movement” is a concept including any of linear movement, rotation, and a combination thereof.
In these first and second drive mechanisms, the manual operation means may be capable of driving the relative movement member directly or via an appropriate mechanism, for example.
According to these first and second driving mechanisms, it is possible to directly transmit the driving force from the driving force generating means for generating the driving force by the electric power to the driven body , thereby reducing the driving force transmission loss. As a result, the driving force transmission efficiency can be improved. As a result, the driving force generating means can be reduced in size, the driving force from the driving force generating means can be stabilized, and the power can be saved.

Furthermore, in the first, second drive mechanism, switching the use of the driving force generating means and the manual actuating means also without using a switching means such as a switching member, their use driving force generating means and the manual actuating means Can be switched easily and easily.

For the first driving mechanism, as the manual operating unit by the driving force generating means at the time of driving the driven body is definitive stopped, for example, the manual operating unit is a state of being engaged with the fixed body, and a manual The engagement between the operating means and the fixed body is an engagement by frictional contact, and the static frictional force in the engagement by the frictional contact is manually operated by the driving force acting between the driving force generating means and the relative moving member. It may be larger than the reaction force received by. As said manual operation means, a manual operation member can be mentioned, for example.
Further, when the driven body is driven by the manual operation means, the driving force is transmitted to the driving force generating means via the relative movement member, and the driving force generating means and the driven body move integrally. For this reason, the driving force generating means is caused to cause a static frictional force between the relative moving member and the driving force generating means via the relative moving member by a driving force acting between the manual operation means and the fixed body. The static frictional force between the relative movement member and the driving force generating means can be made larger than the static frictional force between the driven body and the fixed body.

In both the first and second drive mechanisms, as the first drive force generating means, for example, the relative movement that is excited by the vibration body by electro-mechanical energy conversion and press-contacted with the vibration body is performed. An example is a vibration actuator that transmits a driving force to the output member by relative movement between the members.

The present invention includes an apparatus provided with the driving mechanism described above, for example, a lens driving apparatus that drives a lens in the optical axis direction by a driving force transmitted to the driven body , a camera including the lens driving apparatus, Provides a device equipped with the camera.

As described above, according to the present invention, the driving force generating means that generates the driving force by the electric power that is the first driving force generating means and the manual operation means that is the second driving force generating means are employed, and the driven body the a lens driving mechanism available to the lens driving device for driving toward the target position for the lens driving mechanism for driving toward the target position, for example, a lens in the camera focusing, first, second drive Switching between force generating means can be performed easily and immediately, and the driving force loss in the driving force transmission path from the driving force generating means to the driven body is suppressed, thereby improving the driving force transmission efficiency and, size of the reduction and the lens driving mechanism of the power consumption much in a compact driving force generating means, Ren capable thus reduce the size of apparatus that use the lens driving mechanism It is possible to provide a driving mechanism.

  Further, according to the present invention, an apparatus (for example, a lens driving apparatus, the lens, and the like) that can reduce power required for driving a driven body toward a target position and downsize the apparatus by including such a driving mechanism. A camera provided with a driving device, and a device provided with the camera).

Hereinafter, embodiments of the present invention will be described. In addition, the description part called the following 1st Embodiment is a reference thing.
(1) First embodiment (see FIGS. 1 and 2)
In the following description, “coupled” means not only when the coupled objects are coupled in a state where they cannot move with each other, but also with the coupled objects maintaining a predetermined relationship with each other. In other words, the case is engaged (in other words, connected).
FIG. 1 shows a functional block diagram of the first embodiment of the present invention. An output member that is a driven body (such as the final driving object itself or an object that holds the driving object) and the first driving force generating means are coupled to the fixed body so as to be movable integrally. ing. The output member is supported so as to be movable with respect to the fixed body by bearing means such as a sliding bearing and a rolling bearing. The second driving force generating means and the relative moving member are coupled to the fixed body so as to be integrally movable. The first driving force generating means is coupled to the relative movement member so as to be relatively movable. The driving force generated by the first driving force generation means acts on the relative movement member, and the output member integrally coupled with the first driving force generation means is relative to the relative movement member and the fixed body. Move.

First, with reference to FIG. 2A, the operation when the driving force is input from the first driving force generating means will be described.
The first driving force generating means is, for example, a surface wave motor, and a rotor that frictionally couples with the stator moves by a vibration waveform generated in the stator. The motor body (stator) is loosely fixed to the output member by spring coupling or the like. The first driving force generating means and the relative moving member are movably coupled so that the driving force input by the first driving force generating means acts on the relative moving member.

Here, the rotor of the surface wave motor corresponds to a relative movement member. An engaging portion (for example, a convex portion) provided on the relative movement member (rotor) engages with an engaging portion (for example, a concave portion) provided on the second driving force generating means, so that both move integrally. To do.
The second driving force generating means may be, for example, a rotary moving body using an electromagnetic motor, or a rotation input member by manual operation.

  The second driving force generating means is, for example, frictionally coupled to the fixed body so as to be relatively movable. This frictional force is set so as to be larger than the reaction force received by the second driving force generating unit that is generated when the driving force is input from the first driving force generating unit. For this reason, as a result, the second driving force generation means remains stationary without moving relative to the fixed body, and all the driving forces of the first driving force generation means are the same as those of the output member and the first member. The driving force generating means is used as energy for moving relative to the fixed body and the relative moving member.

  At this time, the rotor of the surface wave motor is stationary with respect to the fixed body integrally with the second driving force generating means, and the stator of the surface wave motor moves relative to the rotor. As a result, the output member moves relative to the fixed body integrally with the stator.

The load seen from the first driving force generating means in this driving mechanism is
(1) Friction generated between the output member and the bearing of the fixed body
(2) Moving load of the power supply member that supplies power to the stator
(3) There are only three masses of the output member. Of these, (2) may be powered by a flexible substrate, wire, or brush. The moving load in these connection methods is a term that can be reduced by the design method.

  The above (1) and (3) are terms that cannot be reduced even if other drive mechanisms are used. On the other hand, in the drive mechanism described in JP-A-2-253214 described as a conventional example, (2) does not occur, but in addition to (1) and (3), the bearing of the differential planetary roller A friction load, a friction load between the differential planetary roller and the rotor of the motor, a friction load between the differential planetary roller and the manual input ring, and the like are generated.

Next, the operation when the driving force is input from the second driving force generating means will be described with reference to FIG.
When a driving force that overcomes the frictional force that couples the second driving force generating means and the fixed body is input by the second driving force generating means, the second driving force generating means is relative to the fixed body. Start moving to. At this time, no driving force is generated in the first driving force generating means. At this time, the friction load between the output member and the fixed body is designed to be light, and the first driving force generating means and the output member are supported so as to be movable integrally with the fixed body. . The first driving force generating means is frictionally coupled to the relative movement member and the second driving force generating means, and the friction force is set to be larger than the friction force between the fixed body and the output member. Therefore, no slip occurs between the first driving force generating means and the relative movement member. Therefore, the output member moves relative to the fixed body by the input from the second driving force generating means.

Next, the operation when the driving force is generated from the second driving force generating means while the first driving force generating means generates the driving force will be described.
When the second driving force generating means is a motor or the like, while the first driving force generating means is operating, the second driving force generating means is controlled to be maintained in a stopped state by a control means (not shown). .
However, when the second driving force generation means is a manual operation, it is assumed that the second driving force generation means is operated by a person while the first driving force generation means is operating. .

  In this case, since the driving force by the first driving force generating means acts on the second driving force generating means, the speed at which the second driving force generating means moves relative to the fixed body, The combined speed of the driving force generating means and the output member relative to the second driving force generating means is the combined speed of the output member with respect to the fixed body. The frictional force generated between the fixed body and the second driving force generation means is a kinetic frictional force, and this force is handled by the driving force of the second driving force generation means. From the viewpoint of the generating means, it is not a driving load.

  However, if the second driving force generating means is moving in the direction opposite to the direction in which the first driving force generating means is moving, the first driving force is required to drive the output member at the desired moving speed. It is necessary for the driving force generating means to generate a driving force that is greater than the original driving force. If such a state occurs continuously, the first driving force generating means may be overloaded.

  Therefore, a detecting means for detecting that the second driving force generating means is moving is provided, and if the detecting means detects that the second driving force generating means is moving, control not shown in the figure. Preferably, the means stops driving the first driving force generating means.

  If the second driving force generating means is moving in the same direction as the direction in which the first driving force generating means is moving, the moving speed of the output member may exceed a predetermined value. In such a case, there is a possibility that control becomes impossible. Therefore, if the detection means detects that the second driving force generation means is moving, the control means drives the first driving force generation means. Is preferably stopped.

(2) Second embodiment (see FIGS. 3, 4, and 5)
A second embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a schematic cross-sectional view showing an example (in other words, an example used as a lens driving device) in which the driving unit (driving mechanism) described in the first embodiment is mounted on a lens barrel and used for focus adjustment. It is.

In FIG. 3, only the main part is displayed, and the exterior, mount, pattern mechanism, electrical parts, and the like that do not directly affect the drive mechanism according to the present invention are not shown.
The lens 6 is fixed to the lens holding cylinder 7. Focus adjustment can be performed by moving the lens 6 back and forth in the optical axis direction. The lens holding frame 7 has a cylindrical shape and is fitted to the fixed cylinder 9.

An interlocking pin 71 protrudes in a radial direction at a part of the lens holding frame 7, and the interlocking pin 71 is guided in the straight guide groove 91 of the fixed cylinder 9. Thus, the lens holding frame 7 is held so as to be movable back and forth in the optical axis direction with respect to the fixed cylinder 9.
A rotating cam cylinder 8 is fitted to the outside of the fixed cylinder 9 and is restricted in movement in the optical axis direction with respect to the fixed cylinder 9 and is held rotatably around the optical axis. A cam groove 81 is provided on the inner peripheral surface of the rotating cam cylinder 8, and an interlocking pin 71 provided on the lens holding frame 7 is engaged with the cam groove. When the rotating cam cylinder 8 rotates with respect to the fixed cylinder 9, it is guided in the cam groove 81, and the interlocking pin 71 of the lens holding frame 7 moves in the optical axis direction while being guided by the rectilinear guide groove 91 of the fixed cylinder 9.

  A flange portion 82 is provided in the vicinity of one end portion of the rotating cam cylinder 8. The actuator 2 is attached to the flange portion 82 via the pressing spring 4. In the actuator 2, the base portion is pressed by the pressing spring 4, and the tip portion is frictionally coupled to the sliding member 5. A similar actuator 1 is arranged on the opposite side across the sliding member 5. Similarly to the actuator 2, the base portion of the actuator 1 is also pressed against the sliding member 5 by the pressing spring 3. These actuators will be described later with reference to FIG.

The pressure adjusting member 12 is screwed to the end of the rotating cam cylinder 8, and the amount of force of the two pressing springs 3 and 4 is adjusted to an appropriate amount by adjusting the position of the screw coupling. The sliding member 5 has an annular shape, and the inner diameter side thereof is arranged with an interval so as not to contact the rotating cam cylinder 8.
A cylindrical manual operation member 11 is provided, and details are not shown in the drawing, but several concave portions are provided on a part of the inner peripheral surface on the circumference. The convex shape part of the outer peripheral surface of the sliding member 5 meshes with the concave shape part and is joined without play.

The manual operation member 11 is coupled to the fixed cylinder 9 with a frictional force larger than the maximum generated force of the actuators 1 and 2. This frictional force may be applied by a frictional force generating spring (not shown) or may be performed by a lubricating oil having a high viscosity such as grease.
The rotating cam cylinder 8 and the manual operation member 11 are restricted at one end of the fixed cylinder 9 so that the movement in the optical axis direction is restricted relative to the fixed cylinder 9 and only the rotation around the optical axis is allowed. 10 are connected.

  An outline of the actuators 1 and 2 is shown in FIG. Piezoelectric elements 23 and 24 are attached to a base member 21 serving as a weight at a predetermined angle. In the example shown in FIG. 4, it is arranged at about 90 degrees. A chip 22 is provided at a position where the two piezoelectric elements intersect. These four members are connected to each other by an adhesive such as epoxy. A power supply member 25 is connected to each of the piezoelectric elements 23 and 24, and a predetermined voltage is applied from a power supply device (not shown). The stator part (in this example, the vibration generating part by the actuator) is frictionally coupled to the moving body 26 at the tip of the chip 22. In order to generate this frictional force, the stator portion is pressed against the moving body 26 by the pressing spring 27 against the fixed portion 28.

When a sine wave voltage shown in FIG. 5A is applied to the piezoelectric element 23 and a sine wave voltage having a different phase shown in FIG. 5B is applied to the piezoelectric element 24, the tip of the chip 22 exhibits an elliptical vibration shown in FIG. 5C. Do.
Due to the elliptical vibration, the moving body 26 moves in a predetermined direction. By changing the phase of the sine wave applied to the two piezoelectric elements 23 and 24, the amplitude, inclination, and rotation direction of the elliptical vibration can be changed, thereby adjusting the speed and moving direction of the moving body. Can do.

Next, the operation of the lens driving device having the driving unit (driving mechanism) described above will be described.
First, when the actuators 1 and 2 are supplied with electric power and vibrate, the actuators 1 and 2, the rotating cam cylinder 8 that supports the actuator, the pressing adjusting member 12, and the pressing springs 3 and 4 are integrated with the sliding member 5 in the center of the optical axis. Rotate to. At this time, the sliding member 5 is integrated with the manual operation member 11, and the manual operation member 11 is coupled to the fixed cylinder 9 with a frictional force larger than the generated force of the actuator. do not do.

  By this operation, the rotating cam cylinder 8 rotates with respect to the fixed cylinder 9. As a result, as described above, the interlocking pin 71 provided on the lens holding frame 7 is guided to the cam groove 81 provided on the inner peripheral surface of the rotating cam cylinder 8, and the interlocking pin 71 is connected to the fixed cylinder 9. The lens holding frame 7 and the lens 6 move in the optical axis direction while being guided by the rectilinear guide groove 91. In this operation, the rotating cam cylinder 8 to the lens 6 are movable parts, and all members from the sliding member 5 to the manual operation member 11 and further to the fixed cylinder 9 remain stopped. Therefore, a frictional force that becomes a driving load is not generated in these.

  When the manual operation member 11 is rotated by a person, the sliding member 5 integrated with the manual operation member 11 rotates around the optical axis with respect to the fixed cylinder 9. Since the sliding member 5 and the actuators 1 and 2 are frictionally coupled, the actuators 1 and 2, and consequently the rotating cam cylinder 8 integrally rotate with the sliding member 5 around the optical axis with respect to the fixed cylinder 9.

  As a result, the interlock pin 71 provided on the lens holding frame 7 is guided to the cam groove 81 provided on the inner peripheral surface of the rotating cam cylinder 8 and the interlock pin 71 is fixed as in the case where the actuator is driven. The lens holding frame 7 and the lens 6 move in the optical axis direction while being guided by the straight guide groove 91 of the tube 9. With this operation, it is possible to manually adjust the lens position.

  The motor which is the first driving force generating means is not limited to the above-described one, but other things such as a standing wave type ultrasonic motor, an annular traveling wave type ultrasonic motor as shown in the conventional example, an electromagnetic wave, etc. Other motors such as a motor may be used. In this embodiment, the two stator portions (vibration generating portions) of the ultrasonic motor are opposed to the rotor equivalent portion (sliding member 5) as the actuators 1 and 2, but the present invention is not limited to this. Alternatively, the number of stators is one, and the pressing force of the stator can be received by the rollers at positions facing each other across the rotor.

(3) Third embodiment (see FIGS. 6 and 7)
A third embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a schematic cross-sectional view showing an example of a drive unit (drive mechanism) according to the present invention mounted on a lens barrel and used for focus adjustment (in other words, used as a lens drive device). is there.

  The lens driving device shown in FIG. 6 is the same as the lens driving device according to the second embodiment described above, in which a speed reduction mechanism is mounted on a manual operation member, and most of the lens driving device is common to the second embodiment. Parts and portions that are substantially the same as the parts and portions in the apparatus shown in FIG.

In the case of lens movement by manual operation, fine adjustment is particularly required, and this fine adjustment is contrary to high-speed movement by a motor. For this purpose, the apparatus of FIG. 6 is an example in which a speed reduction mechanism is mounted only on the manual operation unit.
In this device, the sliding member 5 is integrally fixed to the sliding member holding ring 14. For this fixing, various fixing means such as adhesion, fixing by screws, fixing by insert molding, and the like can be adopted. The sliding member holding ring 14 has an annular shape around the center of the optical axis, and has three shafts 14a that extend in the radial direction with respect to the optical axis and that are equally divided in the circumferential direction. 13 is rotatably supported. The number of the shafts 14a is not limited to this number as long as it is a plurality of three or more and is equally distributed in the circumferential direction.

  The planetary gear 13 is gear-coupled to the fixed cylinder 9 and the manual operation member 11. That is, a gear that engages with the gear 13 is formed on each of the fixed cylinder 9 and the manual operation member 11. The fixed cylinder 9 is always stopped without moving, and the manual operation member 11 is frictionally coupled to the fixed cylinder 9. The frictional force is set larger than the driving force generated between the actuators 1 and 2 and the sliding member 5.

  Next, the operation of the drive unit will be described. First, when the actuators 1 and 2 are supplied with electric power and vibrate, the actuators 1 and 2, the rotating cam cylinder 8 that supports the actuator, the pressing adjustment member 12, and the pressing springs 3 and 4 are integrated with the sliding member 5 in the center of the optical axis. Rotate to. At this time, the sliding member 5 is integral with the sliding member holding ring 14, and the sliding member holding ring 14 is gear-coupled to the fixed cylinder 9 and the manual operation member 11 by the planetary gear 13 supported by the shaft portion 14a. ing. Since the fixed cylinder 9 and the manual operation member 11 are frictionally coupled with a friction force larger than the generated force of the actuator, the planetary gear 13 does not rotate, and the sliding member holding ring 14 rotates with respect to the fixed cylinder 9. do not do. For this reason, the sliding member 5 does not move by the driving force of the actuator, and the rotating cam cylinder 8 that holds the actuator and the actuator rotates relative to the fixed cylinder 9 by the reaction force.

  As a result, as in the case of the apparatus shown in FIG. 3, the interlocking pin 71 provided on the lens holding frame 7 is guided to the cam groove 81 provided on the inner peripheral surface of the rotating cam cylinder 8, and the interlocking pin 71 is provided. The lens holding frame 7 and the lens 6 move in the optical axis direction while being guided by the straight guide groove 91 of the fixed cylinder 9. In this example, the planetary gear 13 is used, but a planetary roller may be used.

With this operation, the rotating cam cylinder 8 to the lens 6 become a movable part, and all the members from the sliding member 5 to the fixed cylinder 9 and the manual operation member 11 remain stopped, so that the planetary gear part (or the planetary roller) The frictional force that becomes the driving load is not generated in these.
When the manual operation member 11 is rotated by a person, the planetary gear 13 that is gear-coupled to the manual operation member 11 rotates with respect to the shaft 14a. At this time, the planetary gear 13 is also gear-coupled with the fixed cylinder 9, and the fixed cylinder 9 does not move. Therefore, the rotation operation of the manual operation member 11 is a revolving operation around the optical axis of the planetary gear. 14 is transmitted.

As shown in FIG. 7, since the revolution operation is decelerated with respect to the movement amount of the manual operation member 11, the movement amount of the sliding member holding ring 14 is smaller than that of the manual operation member 11. The sliding member 5 integrated with the ring 14 rotates around the optical axis with respect to the fixed cylinder 9.
Since the sliding member 5 and the actuators 1 and 2 are frictionally coupled, the actuators 1 and 2 and thus the rotating cam cylinder 8 are integrally rotated with the sliding member around the optical axis with respect to the fixed cylinder 9.

  As a result, as in the case of driving the actuator, the interlocking pin 71 provided on the lens holding frame 7 is guided to the cam groove 81 provided on the inner peripheral surface of the rotating cam cylinder 8, and the interlocking pin 71 is fixed to the fixed cylinder. The lens holding frame 7 and the lens 6 are moved in the optical axis direction while being guided by the 9 straight guide grooves 91. With this operation, the lens position can be manually adjusted.

  The present invention can be used in various fields where it is required to move a driven object toward a target position. For example, the present invention can be used in a lens driving device that drives a lens in a camera toward a target position for focus adjustment.

It is a block diagram which shows embodiment of the drive mechanism shown for reference . It is operation | movement explanatory drawing of embodiment drive mechanism shown in FIG. It is sectional drawing which shows the outline of a structure of 2nd Embodiment which concerns on this invention. It is explanatory drawing of the ultrasonic actuator mounted in the lens drive device of FIG. It is a figure explaining the principle of operation of an ultrasonic actuator. It is a figure which shows the outline of a structure of 3rd Embodiment which concerns on this invention. It is operation | movement explanatory drawing in the lens drive device shown in FIG. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Actuator 3, 4 Pressing spring 5 Sliding member 6 Lens 7 Lens holding cylinder 71 Interlocking pin 8 Rotating cam cylinder 81 Cam groove 82 Flange part 9 Fixed cylinder 91 Linear guide groove 10 Restriction member 11 Manual operation member 12 Press adjustment member 13 Planetary gear 14 Sliding member holding ring 14a Shaft 21 Base member 22 Chips 23 and 24 Piezoelectric element 25 Feeding member 26 Moving body 27 Pressing spring 28 Fixed portion

Claims (8)

A fixed body,
Driving force generating means for generating driving force by electric power;
Manual operation means for generating a driving force by frictional contact with the fixed body and being manually operated;
A driven member that is engaged with the driving force generation unit and is installed so as to move integrally with the driving force generation unit with respect to the fixed body by any driving force of the driving force generation unit or the manual operation unit. Body,
The driving force generating means is coupled to the manual operating means so as to move integrally with the manual operating means with respect to the fixed body, and is movable relative to the driving force generating means. And a relative driving member that is frictionally coupled to the lens driving mechanism,
When the driving force generating means generates a driving force, the relative movement member and the manual operating means are stationary by the driving force and a static frictional force between the manual operating means and the fixed body. When the driven body moves integrally with the driving force generation means and the manual operation means generates a driving force, the driving force and a static friction force between the relative movement member and the driving force generation means Accordingly, a lens in which the driving force is transmitted to the driving force generating means through the relative movement member, wherein said driving force generating means and the driven member is characterized by being configured to move integrally Drive mechanism. A static frictional force between the manual operation means and the fixed body is greater than a reaction force received by the manual operation means by a drive force acting between the drive force generation means and the relative movement member. The lens driving mechanism according to claim 1. The static frictional force between the relative moving member and the driving force generating means is a reaction force received by the driving force generating means via the relative moving member due to the driving force acting between the manual operation means and the fixed body. Bigger,
3. The lens driving mechanism according to claim 1 , wherein a static friction force between the relative movement member and the driving force generating means is larger than a static friction force between the driven body and the fixed body. . A fixed body,
Driving force generating means for generating driving force by electric power;
Manual operation means for generating a driving force by frictional contact with the fixed body and being manually operated;
A driven member that is engaged with the driving force generation unit and is installed so as to move integrally with the driving force generation unit with respect to the fixed body by any driving force of the driving force generation unit or the manual operation unit. Body,
The driving force generating means is coupled to the manual operating means so as to move integrally with the manual operating means with respect to the fixed body, and is movable relative to the driving force generating means. A relative moving member frictionally coupled to ,
A planetary rotator having a rotation shaft in the relative movement member and rotationally coupling between the manual operation member and the fixed body, and moves around the rotation shaft while moving with the relative movement member via the rotation shaft. A planetary rotating body installed so as to be rotatable, and a lens driving mechanism,
When the driving force generating means generates a driving force, the relative moving member, the planetary rotating body, and the manual operating means are caused by the driving force and a static frictional force between the manual operating member and the fixed body. When the driven body moves integrally with the driving force generation means in a stationary state and the manual operation means generates a driving force, the driving force, the relative movement member, and the driving force generation means The driving force is transmitted via the planetary rotating body and the relative moving member by a static frictional force therebetween, and the driving force generating means and the driven body move integrally. A lens driving mechanism. The driving force generating means excites vibration in the vibration member by an electric one mechanical energy conversion, transmitting the driving force to the driven member by relative movement between the vibrating body and the relative movement member which is pressed to The lens driving mechanism according to claim 1, wherein the lens driving mechanism is a vibration type actuator. An apparatus comprising the lens driving mechanism according to claim 1. The apparatus according to claim 6, wherein the apparatus is a lens driving apparatus that drives a lens in an optical axis direction by a driving force transmitted to the driven body .   A camera comprising the lens driving device according to claim 7.