JP2010187461A - Drive system, image pickup device equipped with the same and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive system which has high driving efficiency and is highly stably driven. <P>SOLUTION: The drive system includes a housing holding a body to be driven so that it is displaced in a driving direction, a reciprocating means which reciprocates with respect to the housing and a driving direction conversion means converting a moving direction to a direction different from the reciprocating direction of the reciprocating means and driving the body to be driven. The driving direction conversion means includes a contact part which is brought into contact with the body to be driven, a base part which is fixed to the reciprocating means and fixes the contact part, and an energizing part which is fixed to the housing and energizes the base part in the direction of the body to be driven. The energizing part supports the base part so that it reciprocatively rotates. The contact part fixed to the base part reciprocates in the direction different from the reciprocating direction of the reciprocating means and it drives the body to be driven. Thus, a displacement of the contact part to a direction different from the driving direction of the body to be driven is made small, driving efficiency is improved and driving is stabilized. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a driving device, an imaging device including the driving device, and an electronic apparatus.

  In recent years, a drive device using an electromechanical conversion element (piezoelectric element) has been proposed as a drive device for driving a driven body. Such a driving device is often used as a driving device that drives a lens of an imaging device such as a camera.

For example, Patent Document 1 describes a drive device using a piezoelectric element that bends when a voltage is applied. The drive device described in Patent Document 1 includes a bending displacement member (reciprocating means) such as a piezoelectric element, a holding portion (housing) that holds one end of the bending displacement member, and the other end (reciprocating motion portion) of the bending displacement member. And a driving direction conversion means (consisting of a transmission member and a friction member) that contacts the driven body and converts the displacement direction to a direction different from the bending displacement direction of the bending displacement member to drive the driven body. Driving direction conversion means). In this drive device, when the reciprocating motion part reciprocates, the drive direction converting means converts the motion direction to a direction different from the motion direction of the reciprocating motion part, and the contact portion provided on the drive direction converting means drives the driven body. By being displaced in the direction, the driven body is driven by a frictional force with the contact portion.
WO2008 / 096797 (released on August 14, 2008)

The drive device described in Patent Document 1 includes drive direction conversion means including a transmission member and a friction member for the purpose of converting the reciprocation direction of the reciprocation unit into the drive direction of the driven body. FIG. 9 shows the configuration of the drive direction conversion means described in Patent Document 1. The transmission member 4 has a base portion that protrudes from one end of the reciprocating means 5 and an arm portion that extends from the base portion to one side perpendicular to the protruding direction. And the friction member is provided in the arm part.

FIG. 10 shows a schematic operation side view of the transmission member and the friction member. FIG. 9 illustrates a state in which the arm portion 4b extending in the −Z direction from the base portion 4a and the friction member 3 provided on the surface of the arm portion 4b in the + Y direction vibrate due to the bending operation of the bending displacement member in the Y direction. It is a thing. The vibration is a combined movement such as a vibration in the Y direction of the base 4a, a reciprocating rotational movement around the base 4a in the YZ plane direction, and a bending movement of the arm 4b in the YZ plane direction. Note that the amplitude of the base portion 4a in the Y direction and the reciprocating rotational motion around the base portion 4a in the YZ plane direction are very small compared to the amplitude of the arm portion 4b, and therefore are not shown in FIG.
Along with this vibration, the contact portion at the tip of the friction member 3 provided on the arm portion 4b and in contact with the driven member is displaced in the Y direction and the Z direction. Among the displacements of the contact portion, the displacement in the Z direction is used to drive the driven body in the Z direction, but the displacement in the Y direction is used only to vibrate the driven body in the Y direction, and the energy is It is consumed wastefully without being used to drive the drive body in the Z direction. Further, since the driven body vibrates greatly in the Y direction, it is technically difficult to keep the contact portion and the driven body in contact with each other at a constant pressure, and it is difficult to stabilize the driving. .

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drive device that can stabilize drive and improve drive efficiency.

In order to solve the above-described problems, a driving apparatus according to the present invention includes a housing that holds a driven body so as to be displaceable in a driving direction, reciprocating means that reciprocates with respect to a housing, and reciprocating movement of the reciprocating means. A driving direction conversion means for driving the driven body by converting the movement direction to a direction different from the direction, wherein the driving direction conversion means includes a contact portion that contacts the driven body and a reciprocating movement means. A fixed base that fixes the contact portion; and a biasing portion that is fixed to the housing and biases the base toward the driven body, and the biasing portion supports the base in a reciprocating manner. It is characterized by.
According to the above configuration, the reciprocating motion of the reciprocating means is converted into the reciprocating rotational motion by the base portion supported so as to be reciprocally rotatable by the urging portion fixed to the housing, and the contact portion fixed to the base portion reciprocates. Since the reciprocating motion is different from the reciprocating motion direction of the movement means, and the driven body is driven, the displacement of the contact portion in the direction different from the driving direction of the driven body is reduced, driving efficiency is improved, and driving is performed. Is stabilized.

In the drive device according to the present invention, it is preferable that a straight line connecting the center of the reciprocating rotation and the contact portion is parallel to the reciprocating direction of the reciprocating means in a stationary state. According to the above configuration, the contact surface of the contact portion is mainly displaced in a direction perpendicular to the normal line by the reciprocating rotational movement of the base portion, so that the displacement of the contact portion in a direction different from the drive direction of the driven body is small. Thus, the driving efficiency is improved and the driving is stabilized.
In the drive device according to the present invention, it is preferable that the base portion and the urging portion are engaged by a convex shape formed on one side and a concave shape formed on the other side.

According to the above configuration, the engagement portion is less likely to be displaced, and can be stably reciprocally rotated about the engagement portion as a rotation center, thereby further reducing transmission loss.
In the driving apparatus according to the present invention, a part of the reciprocating means also serves as a base part of the driving direction changing means.
According to the above configuration, the number of parts is reduced and the structure is simplified, so that a low-cost, small, or lightweight drive device can be obtained. In addition, the risk of failure and the like is reduced, and reliability and durability are improved.

  In order to solve the above-described problems, an imaging apparatus according to the present invention includes the above driving device.

  According to the above configuration, it is possible to provide an imaging device that operates quickly and with a fast autofocus or zoom operation, consumes less energy, and operates stably.

  In order to solve the above-described problems, an electronic apparatus according to the present invention includes the drive device or the imaging device.

  According to said structure, the electronic device which is excellent in drive efficiency and can drive stably can be provided.

  In the driving device according to the present invention, the reciprocating motion of the reciprocating motion means is converted into a reciprocating rotational motion by a base portion supported so as to be capable of reciprocating rotation by an urging portion fixed to the housing, and a contact portion fixed to the base portion is provided. Since the reciprocating motion of the reciprocating motion means is reciprocated in a direction different from the reciprocating motion direction to drive the driven body, the displacement of the contact portion in the direction different from the driving direction of the driven body is reduced, and the driving efficiency is improved. Driving is stabilized.

The embodiment of the present invention will be described with reference to FIGS. 1 to 8 as follows.
[Embodiment 1]
FIG. 1 is a schematic perspective view showing the configuration of the drive device according to the first embodiment.

  In the following description, the moving direction of the driven body is the Z direction, the displacement direction of the bending displacement member perpendicular to the Z direction is the Y direction, and the Y direction and the direction perpendicular to the Z direction are the Z direction.

  As shown in FIG. 1, the driving device according to the present embodiment has a driven body 2 and one end portion fixed to a fixed wall 6 a of a housing 6, and a bending displacement member 5 that generates a bending displacement by electrical control. And one end portion is connected to the bending displacement member 5, and the other end portion is in contact with the second friction member 7 attached to the driven body contact portion 2a of the driven body 2 at least in the stationary state of the present invention. The first friction member 3 and one end thereof are fixed to the projecting portion 2b of the driven body 2 and the other end thereof is fixed to the spring fixing portion 6b of the casing 6, and the driven body A preloading member 1 made of a tension coil spring that biases the contact portion 2a toward the first friction member 3 is provided. The “contact” between the friction member 7 and the first friction member 3 means that the contact is at least in a stationary state of the present invention and at a certain period during the operation of the present invention. There is no need. There may be a state in which the friction member 7 and the first friction member 3 are separated from each other during a certain period of operation. In addition, although the 2nd friction member 7 is provided in the to-be-driven body contact part 2a, the structure to make the to-be-driven body contact part 2a and the 1st friction member 3 contact without providing the 2nd friction member 7 is also possible. Good. In that case, as a material of the first friction member 3, for example, a metal, carbon, or a resin material may be appropriately selected in consideration of a friction coefficient or the like.

  As shown in FIG. 1, the center of the preload member 1 is positioned substantially on the same line as the direction in which the first friction member 3 and the second friction member 7 provided on the driven body contact portion 2 a are in contact with each other. In addition, the preload member 1 and the first friction member 3 are disposed at a position sandwiching the driven body contact portion 2a (that is, on the opposite side), and the driven body contact portion 2a of the driven body 2 by the preload member 1. Is biased toward the friction member 3. In this specification, “energized” indicates that the device of the present invention needs to be in an energized state at least in a stationary state or a certain period during operation. It does not mean that it must be constantly energized. In the present embodiment, at least a stationary state and a configuration in which the bending displacement member 5 is energized during a period in which the bending displacement member 5 is bent toward the second friction member 7 are configured. The configuration related to the preload member 1 is a means for urging the driven body contact portion 2a of the driven body 2 toward the friction member 3 and may have a configuration other than the present embodiment.

One end of the preload member 1 is fixed to the driven body contact portion 2 a of the driven body 2 and the other end is fixed to the housing 6. For this reason, when the driven body 2 moves, the preload member 1 also moves together and deforms accordingly.
The casing 6 is provided with a guide member 6c, and the driven body 2 can be smoothly moved (displaced) in the Z direction by fitting with the guide hole 2c provided in the driven body 2. In this state, it is held by the housing 6.

  The casing 6 is means for fixing the preload member 1 and the bending displacement member 5 at predetermined positions and supporting the driven body 2 so as to be movable in the driving direction. The housing 6 has a frame structure including the preload member 1, the bending displacement member 5 and the like therein, and is necessary to ensure the strength and function of the driving device, but may not be necessary depending on the mounting state of the driving device. There is also. For example, the housing 6 is not necessary when the drive device of the present invention is built in an electronic device or the like and is provided with another structure that replaces the housing. However, in the present invention, other structures that are alternatives to the housing are also regarded as the housing of the driving device.

  The fixed end (one end portion) of the bending displacement member 5 and the other end portion of the preload member 1 are fixed to the housing 6. Therefore, as the driven body 2 moves, the relative position between the driven body 2 and the housing 6 changes, and the relative positions between the driven body 2 and the bending displacement member 5 and the preload member 1 also change.

In the present embodiment, the bending displacement member 5 is a bimorph type piezoelectric element, which is configured by forming laminated piezoelectric elements on both sides or one side of a metal plate called a shim, and the free end thereof in the Y direction. It is bent and displaced in a parallel direction.
The bending displacement member 5 is an example of a reciprocating means. In this specification, “reciprocating means” is used to mean means for converting other energy into kinetic energy and generating reciprocating motion. In the present embodiment, only the bending displacement member 5 is shown in a narrow sense, and the bending displacement member 5 and an electric circuit for applying a voltage to the bending displacement member 5 are included in a broad sense. good. Further, the vibrator is not limited to the bimorph type piezoelectric element, and other vibrators may be used.

  A vibration control member 8 is disposed on one free end side of the bending displacement member 5, and the first friction member 3 is fixed to the opposite free end. Further, in order to change the weight balance in the Z direction with respect to the bending direction Y of the bending member, a counterweight 5c is provided as shown in FIG.

  The first friction member 3 rotates and reciprocates according to the bending operation of the bending displacement member 5. Then, the driven body 2 becomes Z by the action of the frictional force acting between the first friction member 3 generated by the preloading load by the preloading member 1 and the second friction member 7 provided in the driven body contact portion 2a. Move in the direction. As materials for the first friction member 3 and the second friction member 7, a suitable material may be selected in consideration of each other's friction coefficient, and examples thereof include metals, resins, and carbon.

One end of the vibration control member 8 is fixed to the housing 6, and a projection 8 a is formed at the other end as shown in FIG. 2, and this projection 8 a is in contact with the first friction member 3 of the bending displacement member 5. It arrange | positions so that it may contact in the back surface vicinity of the contact part vicinity. Ideally, the straight line connecting the protrusion 8a and the tip 3a of the friction member 3 is desirably parallel to the Y direction, that is, the displacement direction of the bending displacement member 5 in a stationary state.
The material of the vibration control member 8 is an elastic body made of metal, resin, or the like. The bending displacement member 5 can be biased in the direction of the friction member 3 according to the amount of displacement while being displaced together. Further, the vibration control member 8 may have a structure in which elasticity is provided in the Y direction by a coil spring or the like as a structure other than the leaf spring structure as shown in FIG.
The tip of the protrusion 8a has a small substantially circular shape when viewed from the X direction. With this configuration, the bending displacement member 5 can be supported so as to be able to rotate about the contact point with the protrusion 8a. In FIG. 2, the protrusion 8 a is formed integrally with the vibration control member 8, but it may be made of a different material, and the protrusion is formed on the bending displacement member 5 side and not formed on the vibration control member 8. It does not matter. This will be described in the second embodiment.

  The friction member 3 and the vibration control member 8 are elements of the drive direction conversion means. The drive direction conversion means is means for driving the driven body by converting the movement direction to a direction different from the reciprocation direction of the reciprocation means. Moreover, the site | part of the 1st friction member 3 which contacts the friction member 7 or the to-be-driven body 2 is called a contact part. The contact portion is a part of the drive direction changing means that contacts the driven body. The vibration control member 8 is an urging unit. The urging portion is a part of driving direction changing means for urging the contact portion in the direction of the driven body, and the urging portion supports the contact portion so as to be capable of reciprocating rotation. In this embodiment, the biasing portion (vibration control member 8) indirectly biases the contact portion by biasing the back surface of the bending displacement member 5 to which the contact portion (friction member 3) is fixed. ing. Moreover, since the urging | biasing part and the bending displacement member 5 contact | connect by a projection part, it can support so that reciprocating rotation is possible.

In the present embodiment, the portion on the free end side of the bending displacement member 5 is configured to also serve as the base of the drive direction conversion means. Specifically, a friction member 3 having a friction portion is attached to the bending displacement member 5 and is biased by a vibration control member 8 (biasing portion). These are the functions of the base of the drive direction conversion means. According to the present embodiment, since there is no need to separately provide a member to be a base, the number of parts is reduced and the structure is simplified, thereby reducing production costs, reducing size and weight, improving reliability, and durability. Is possible.
The effect of providing the vibration control member 8 will be described with reference to FIG.
FIG. 7 is an explanatory diagram showing the trajectory of the movement of the tip 3a of the first friction member 3 (ie, the contact portion). FIG. 7A shows the locus of the comparative example without the vibration control member 8, and FIGS. 7B and 7C show the locus of the present invention. FIG. 7B shows a case where the spring constant related to the displacement in the Y direction of the vibration control member 8 is large, and FIG. 7C shows a case where the spring constant related to the displacement in the Y direction of the vibration control member 8 is small. When it is desired to reduce the spring constant related to the displacement of the vibration control member 8 in the Y direction, a method such as using an elastic body with low rigidity as the material or making the shape thin, thin and long can be used. In order to increase the size, a rigid body having a high rigidity may be used as the material, or the shape may be made thicker, thicker and shorter. 7A, 7B, and 7C are described with the position of the tip 3a when the bending displacement member 5 is not bent as the origin.
When the vibration control member 8 is not provided, when a current having a certain driving frequency is caused to flow through the bending displacement member 5 to bend and displace, the tip 3a of the first friction member 3 has a long diameter A as shown in FIG. Then, a trajectory is drawn that rotates an elliptical orbit inclined at an angle E from the Y axis. This elliptical motion is a combined motion of a reciprocating motion in the Y direction and a reciprocating motion in the Z direction. The reciprocating motion in the Y direction is directly brought about by the reciprocating motion in the Y direction of the bending displacement member. The reciprocating motion in the Z direction is generated when the bending displacement member is twisted about an axis parallel to the X axis, and the tip of the friction member in the Y direction of the twist axis is displaced in the Z direction. It is considered that the twist occurred because the Y-direction reciprocation of the −Z end of the bending displacement member 5 was delayed from the entire reciprocation of the bending displacement member 5 due to the inertial force of the counterweight 5c. It is not necessary to explicitly fix the counterweight 5c as in the present embodiment. Even when the weight balance is small such as a production tolerance, the torsional motion is generated. Therefore, a transmission member, a friction member, a bending displacement member, or the like may be formed as a substantially mirror-symmetrical shape in the Z direction. Since the reciprocating motion in the Y direction is caused by the moment of inertia, the reciprocating motion in the Y direction is delayed (that is, the phase is different) compared to the reciprocating motion in the Z direction. When the reciprocating motion in the Z direction and the reciprocating motion in the Y direction having different phases are combined, an elliptical motion is obtained as shown in FIG. Of the elliptical motion, the displacement in the Z direction is used to drive the driven body in the Z direction, while the displacement in the Y direction is used only to vibrate the driven body in the Y direction, and the energy is driven. It is consumed wastefully without being used to drive the body in the Z direction. In addition, since the driven body greatly vibrates in the Y direction, it is technically difficult to keep the contact portion and the driven body in contact with each other at a constant pressure, and it is difficult to stabilize the driving. .

The locus of the tip of the friction member when the vibration control member 8 is added to the configuration of the comparative example of FIG. When the vibration control member 8 is provided, the amplitude in the Y direction is smaller than that in the comparative example shown in FIG. 7A, but the amplitude in the Z direction is not so small. In the case of FIG. 7C, the amplitude in the Z direction is rather large. As a result, the vibration energy in the Y direction, which is used only to vibrate in the Y direction and is wasted, is reduced, and the driving efficiency is improved. Moreover, since it becomes easy to make a contact part and a to-be-driven body contact with a fixed pressure, a drive can be stabilized.
The effect | action which the vibration control member 8 exerts on the motion of the friction part 3a is demonstrated below. When a force for displacing the bending displacement member 5 in the direction of the vibration control member 8 is generated, since the vibration control member 8 is present in the displacement direction, the bending displacement member 5 is translated in the direction in which the vibration control member 8 is present. I can't. That is, the vibration control member 8 restricts the movement of the bending displacement member 5 in the Y direction and reduces its amplitude. This is the main reason why the amplitude in the Y direction in FIGS. 7B and 7C is smaller than that in FIG. In addition, since the reciprocating motion in the Z direction uses the amplitude of the bending displacement member 5 in the Y direction as a driving force, the reciprocating motion in the Z direction decreases as the amplitude of the bending displacement member 5 in the Y direction decreases. This is the main reason why the amplitude in the Z direction in FIG. 7B is smaller than that in FIG.
Further, since the bending displacement member and the vibration control member 8 are supported so as to be capable of reciprocating rotation about the contact point between the protrusion 8 a and the bending displacement member 2, the bending displacement member is displaced in the direction of the vibration control member 8. The force to be converted is converted into a clockwise or counterclockwise rotational force about an axis parallel to the X axis passing through the contact point between the protrusion 8a and the bending displacement member 5, and the contact portion reciprocates in the Z direction. To make it larger. This is the reason why the amplitude in the Z direction with respect to the amplitude in the Y direction in FIGS. 7B and 7C is larger than that in FIG.
In the invention of FIG. 7B, since the spring constant of the vibration control member 8 is large, the amplitude of the bending displacement member is severely limited. Therefore, since the amplitude in the Y direction is small, stable operation is possible.
In the invention of FIG. 7 (c), since the spring constant of the vibration control member 8 is small, the amplitude of the bending displacement member is not limited as in FIG. 7 (b), but becomes smaller than that of FIG. Operation is possible. Further, since the movement of the bending displacement member in the Y direction is not limited as much as in FIG. 7B, the energy to be displaced in the Y direction is efficiently converted into a rotational force, resulting in a large-angle reciprocating rotation, The reciprocating motion in the Z direction of the contact portion is further increased, and the drive body is efficiently driven.
Further, a straight line connecting the center of the reciprocating rotation (that is, the protrusion 8a) and the friction portion (that is, the tip 3a of the friction member) is parallel to the Y direction, that is, the reciprocating direction of the reciprocating means in a stationary state. desirable. In the case of the above arrangement, the friction part is mainly displaced in the Z direction (driving direction) by the reciprocating rotational motion, so that the displacement in the Y direction is small, the driving efficiency is high, and the driving is stable [Second Embodiment].
FIG. 3 is a schematic side view showing the configuration of the driving apparatus according to the second embodiment.

  Since the other configuration of the drive device in the present embodiment is the same as the configuration of the drive device in the first embodiment, the description thereof is omitted.

As shown in FIG. 3A, in the driving device in the present embodiment, one end of the vibration control member 8 is fixed to the housing 6 (not shown), and a protruding portion 8a having a convex shape is formed at the other end. A fixing member 9 having a concave shape is provided in the vicinity of the back surface in the vicinity of the joint portion of the bending displacement member 5 with the first friction member 3, and the protrusion 8 a and the fixing member 9 are engaged with each other. is doing. Further, as shown in FIG. 3B, a bending displacement member hole portion 5a having a concave shape is provided in the vicinity of the joint portion between the bending displacement member 5 and the first friction member 3, and the bending displacement member hole portion 5a. The protrusion 8a may be engaged with. Since the bending displacement member 5 is formed by sintering, for example, PZT, which is a general piezoelectric material, a protrusion for forming the bending displacement member hole 5a is provided in the mold during sintering. It is possible to form at an arbitrary location.
Instead of the hole 5a and the protrusion 8a in FIG. 3B, the protrusion 5b having a convex shape provided in the bending displacement member and the recess provided in the vibration control member 8 as shown in FIG. 3C. Of course, the same effect can be obtained with the hole portion 8b having a shape, and a convex fixing member 9 may be used instead of the protruding portion, or a concave fixing member 9 may be used instead of the hole portion. May be. The bending displacement member 5 (base portion) and the vibration control member 8 (biasing portion) are engaged with each other by the convex shape formed on one side and the concave shape formed on the other side, so that the displacement of the engaging portion is shifted. It is less likely to occur, and the reciprocating rotational motion can be stably performed with the engaging portion as the center of rotation, thereby further reducing transmission loss. In addition, by fixing by adhesion, even when a portable device equipped with this mechanism falls, the engaging portion is securely engaged without being disengaged.
When assembling this device, the attachment position of the urging unit with respect to the housing is adjusted in the XZ direction to change the engagement position between the urging unit and the base, and the movement of the contact position due to the assembly error of each member. It can absorb the deviation. Specifically, the vibration control member is fixed to the housing with a screw or the like, the vibration control member is temporarily fixed, the apparatus is operated, and a measuring instrument such as a laser displacement meter is used. Thus, by observing the movement of the friction part and permanently fixing the vibration control member at a position exhibiting desired characteristics, it is possible to provide a drive device that is driven efficiently and stably.

[Embodiment 3]
FIG. 4 is a schematic perspective view showing the configuration of the driving apparatus according to the third embodiment.

In the other configuration of the drive device in the present embodiment, the omitted portion has the same configuration as that of the drive device in the first embodiment.
In the present embodiment, the transmission member 4 is provided between the bending displacement member 5 and the first friction member 3 and is biased by the vibration control member 8. In the present embodiment, the transmission member 4 is an element and a base part of the drive direction conversion means.
FIG. 5A shows a part of the drive mechanism of the drive device. The first friction member 3, the transmission member 4 and the bending displacement member 5 constitute a drive mechanism, and the first friction member 3 and the transmission member 4 change the driving direction with respect to the displacement direction of the bending displacement member 5. The

  The transmission member 4 has a base portion that protrudes from one end of the bending displacement member 5 and an arm portion that extends from the base portion to one side perpendicular to the protruding direction. And the friction member 3 is provided in the arm part.

The transmission member 4A shown in FIG. 5B has a base portion that protrudes from one end of the bending displacement member 5 and two arm portions that extend from the base portion to both sides in a direction perpendicular to the protruding direction. The two arms have different lengths. A friction member 3 is provided at the base.
Further, the transmission member 4B shown in FIG. 5C has a base portion that protrudes from one end of the bending displacement member 5 and two arm portions that extend from the base portion to both sides in a direction perpendicular to the protruding direction. . The two arm portions have the same length, and one arm portion includes a counterweight 4C. A friction member 3 is provided at the base.

As mentioned above, although various shapes can be considered for the transmission member 4, any shape may be used as long as the effect of the present invention is not impaired.
The effects of the vibration control member 8 in the fourth embodiment are the same as those in the first embodiment. In the first embodiment, if the place where the vibration control member 8 is placed in contact with the friction member 7 is read as the place where the vibration control member 8 is placed in contact with the transmission member 4, vibration control is performed. There is no difference in the substantial operational effect of the member 8.
In addition, by using the transmission member 4 which is a member different from the bending displacement member 5 as the base, it is preferable in consideration of physical attributes (specific gravity, rigidity, durability, etc.) required for the base, price, and production method. Since a material and a shape can be selected, a driving device having excellent performance and price can be obtained.
[Embodiment 4]
FIG. 8 is a schematic side view showing the configuration of the driving apparatus according to the fourth embodiment.

  Since the other configuration of the drive device in the present embodiment is the same as the configuration of the drive device in the first embodiment, the description thereof is omitted.

  As shown in FIG. 8A, in the driving device in the present embodiment, one end of the vibration control member 8 is fixed to the housing 6 (not shown), and the protruding portion 8a having a convex shape is formed at the other end. It is formed and is engaged in the vicinity of the back surface in the vicinity of the joint portion of the transmission member 4 with the first friction member 3, and a fixing member 9 having a concave shape is provided, and the protruding portion 8 a and the fixing member 9 are provided. And are engaged. Further, as shown in FIG. 8B, a transmission member hole portion 4a having a concave shape is provided in the vicinity of the joint portion between the transmission member 4 and the first friction member 3, and a projection portion is provided in the transmission member hole portion 4a. 8a may be engaged. Further, instead of the transmission member hole 4a and the projection 8a in FIG. 8B, the projection 4b and the vibration control member 8 having a convex shape provided on the transmission member as shown in FIG. 8C are provided. Of course, the same effect can be obtained as the hole 8b having a concave shape. Alternatively, the fixing member 9 having a convex shape can be used instead of the protrusion, or the fixing member 9 having a concave shape can be used instead of the hole. It may be used. The bending displacement member 5 (base portion) and the vibration control member 8 (biasing portion) are engaged with each other by the convex shape formed on one side and the concave shape formed on the other side, so that the displacement of the engaging portion is shifted. It is less likely to occur, and the reciprocating rotational motion can be stably performed with the engaging portion as the center of rotation, thereby further reducing transmission loss. In addition, by fixing by adhesion, even when a portable device equipped with this mechanism falls, the engaging portion is securely engaged without being disengaged.

In the above embodiment, the first friction member 3 and the transmission member 4 are configured as separate members. However, the first friction member and the transmission member may be integrally formed.
The driving device according to the present invention may be used as means for driving a lens of an imaging device such as a camera. Specifically, a lens barrel having an annular lens mounting portion is installed at the center of the driven body 2, and the lens is moved in the optical axis direction (z direction) by a driving mechanism including the friction member 3 and the electromechanical conversion element 5. ) To realize the AF (autofocus) or zoom operation of the lens attached to the lens attachment portion. As a result, the present invention can provide an imaging apparatus that operates quickly with a fast autofocus or zoom operation, consumes less energy, and operates stably. In addition, the drive device and the imaging device according to the present invention may be mounted on all electronic devices. According to this, it is possible to provide an electronic device that is excellent in driving efficiency and stably driven.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible in the range shown to the claim. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  When the drive device according to the present invention is used for driving a lens of an imaging device such as a camera or an optical microscope, for example, it is possible to provide a product having excellent speed, accuracy, or the like of autofocus, zoom, camera shake correction, and diaphragm. it can. Moreover, it can use for various uses also as drive other than the drive of a lens. For example, a head drive device of a disk device or a printing device, various assembling devices, artificial muscles used in a robot, or the like can be considered.

It is a schematic perspective view which shows the structure of the drive device in Embodiment 1 of this invention. It is a schematic side view which shows the drive mechanism in Embodiment 1 of this invention. It is a schematic side view which shows the structure of the drive device in Embodiment 2 of this invention. It is a schematic perspective view which shows the structure of the drive device in Embodiment 3 of this invention. It is a schematic perspective view which shows a part of drive mechanism of the drive device in this invention. It is a schematic side view which shows the drive mechanism in Embodiment 3 of this invention. It is explanatory drawing which shows a motion of the front-end | tip of the friction member 1 in the drive device of implementation of this invention. It is a schematic side view which shows the structure of the drive device in Embodiment 4 of this invention. It is a schematic perspective view which shows the structure of the drive direction conversion means of a prior art. It is explanatory drawing which shows a motion of the drive direction conversion means of a prior art.

DESCRIPTION OF SYMBOLS 1 Preload member 2 Driven body 2a Driven body contact part 2b Driven body spring fixing | fixed part 2c Driven body guide hole 3 1st friction member 3a The front-end | tip (contact part) of a 1st friction member
4 transmission member 4a transmission member hole 4b transmission member projection 4c counterweight 5 bending displacement member 5a bending displacement member hole 5b bending displacement member projection 5c counterweight 6 housing 6a bending displacement member fixing wall 6b housing spring fixing portion 6c Guide member 7 Second friction member 8 Vibration control member 9 Fixing member

Claims (6)

A housing that holds the driven body so as to be displaceable in the driving direction;
Reciprocating means for reciprocating relative to the housing;
A drive device comprising drive direction conversion means for driving the driven body by converting the movement direction to a direction different from the reciprocation direction of the reciprocation means,
The drive direction conversion means includes a contact portion that contacts the driven body,
A base fixed to the reciprocating means and fixing the contact portion;
A biasing portion fixed to the housing and biasing the base toward the driven body;
The urging portion supports the base portion so as to be capable of reciprocating rotation.   2. The drive device according to claim 1, wherein a straight line connecting the center of the reciprocating rotation and the contact portion is parallel to a reciprocating direction of the reciprocating means in a stationary state.   The drive device according to claim 1, wherein the base and the urging portion are engaged by a convex shape formed on one side and a concave shape formed on the other side. 2. A driving apparatus according to claim 1, wherein a part of the reciprocating means also serves as a base part of the driving direction changing means.   An imaging apparatus comprising the driving apparatus according to claim 1.   An electronic apparatus comprising the drive device according to claim 1 or the imaging device according to claim 5.