JP2006345589A - Driver, imaging apparatus employing it and control method of driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To settle the position of a moving member in a driver utilizing electromagnetic force under a state where power supply to the driver is interrupted. <P>SOLUTION: The imaging apparatus 100 comprises a fixing member 6, a lens frame 4 provided to move in the axial direction and abut against the fixing member 6 in the axial direction with lenses 1, 2 and 3 fixed thereto, a first permanent magnet 9 provided on the lens frame 4, a first yoke 8 provided on the lens frame 4 and arranged oppositely to the first permanent magnet 9 in the direction perpendicular to the axial direction of the first permanent magnet 9, a coil 10 provided on the fixing member 6 and arranged between the first permanent magnet 9 and the first yoke 8 in the direction perpendicular to the axial direction, and a second yoke 11 provided on the fixing member 6 and arranged on one axial side of at least any one of the first permanent magnet 9 and the first yoke 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a driving device capable of driving a moving member in a linear direction, an imaging device capable of driving a lens in an optical axis direction using the moving member, and a control method for the driving device.

In recent years, along with the downsizing and mobile use of digital imaging devices represented by digital still cameras and digital video movies, lenses and actuators for driving the lenses have been downsized. As an actuator, an electromagnetic linear drive device that drives a lens frame that holds a lens by electromagnetic force is known.
This drive device is used not only in a digital imaging device but also in a reciprocating fluid machine as disclosed in Patent Document 1, for example. Hereinafter, the drive device described in Patent Document 1 will be described with reference to FIG.

  FIG. 21 shows a cross-sectional view of a conventional drive device. This drive device includes a bobbin 38, two drive coils (electromagnetic coils) 39a and 39b, a piston 40 (moving member), a first permanent magnet 41, a second permanent magnet 42, and a holding frame (fixed). Member) 43. The bobbin 38 is a cylindrical member made of an insulating resin and is fixed to the holding frame body 43. Drive coils 39a and 39b are wound around the bobbin 38, respectively. The drive coils 39a and 39b are connected so that currents flow in different directions. The piston 40 is disposed on the inner peripheral side of the bobbin 38 so as to be movable in the axial direction, and a cylindrical first permanent magnet 41 is fixed to the outer peripheral portion. The second permanent magnet 42 is an annular permanent magnet for generating an attractive force with the magnetic pole of the first permanent magnet 41, and is arranged on the outer peripheral side of the drive coils 39a and 39b.

  Of the drive coils 39a and 39b, for example, the drive coil 39a is on the outer peripheral side of the end portion including the south pole of the first permanent magnet 41, and the drive coil 39b is on the outer peripheral side of the end portion including the north pole of the first permanent magnet 41. , Each is arranged. By passing a current through the drive coils 39a and 39b, an electromagnetic force based on Fleming's left-hand rule acts on the piston 40 due to the interaction between the magnetic field generated by the piston 40 and the currents of the drive coils 39a and 39b. Thereby, for example, with the polarity shown in FIG. 21, the piston 40 moves to the right side in the figure. Further, if the currents of the drive coils 39a and 39b are reversed, the direction of the urging force is also reversed, and the piston 40 moves to the left in the drawing. Therefore, the piston 40 can be reciprocated 50 or 60 times per second by passing an AC current of 50 Hz or 60 Hz, for example, to the drive coils 39a and 39b.

Furthermore, by arranging the second permanent magnet 42 at an intermediate position on the outer peripheral side of the bobbin 38, a magnetic attractive force can be generated in a direction to return the piston 40 to the intermediate position of the bobbin 38, and the reciprocating motion of the piston 40 It can be fast and smooth. Further, by setting the strength of the magnetic field of the first permanent magnet 41 appropriately and bringing the resonance point of the reciprocating vibration of the piston 40 close to 50 Hz or 60 Hz, a more efficient reciprocating motion of the piston 40 can be obtained.
JP-A-7-259729 JP-A-7-238446 JP-A-11-150972

  However, the conventional driving device described above is based only on a simple reciprocating motion of the moving member and has no position detection means, so that high-speed and high-precision positioning control is impossible. Further, although the moving member is urged to the approximate center position of the movable region, since the position restricting means or the like is not provided, the moving member cannot be completely fixed in a state where the energization to the coil is cut off.

  Moreover, there exists a method of energizing a movable part using a spring like patent document 2. FIG. However, in this case, in order to drive the movable portion, the actuator needs to generate a driving force that opposes the spring force. For example, if the spring is a compression spring, the force is moved in the direction in which the movable portion compresses the spring. The larger the size, the greater the driving force required by the actuator, and there is a disadvantage that the entire drive device becomes larger.

  Further, there is a technique for performing positioning control of a moving member without providing an urging mechanism as in Patent Document 3. However, in this case, in a state where the power supply to the coil is cut off, the moving member freely moves along the guide means, so that the moving member comes into contact with the fixed member when carrying the drive device with the power off. . As a result, rattling and contact sounds are generated, which causes discomfort to the user. Further, in order to hold the moving member in position, it is necessary to energize the coil at all times, and there is a disadvantage that power consumption increases.

An object of the present invention is to stabilize the position of a moving member in a state where a power source of a driving device is turned off.
Another object of the present invention is to reduce the power consumption of the drive device.

  The driving device according to claim 1, a fixed member, a moving member fixed to the driven member, movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction, and the moving member A first permanent magnet provided on the movable member, a first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction, and a first permanent magnet provided on the fixed member. And a coil disposed between the direction perpendicular to the axial direction of the first magnetic body and the fixing member, and disposed on one axial direction side of at least one of the first permanent magnet and the first magnetic body. At least one second magnetic body.

  Most of the magnetic flux flowing out from the N pole of the first permanent magnet flows into the first magnetic body and returns from the first magnetic body to the S pole of the first permanent magnet. However, since the first permanent magnet on the moving member side and the coil on the fixed member side are arranged to face each other and the coil penetrates the first magnetic body in the axial direction, There is a space without the first magnetic body. As a result, part of the magnetic flux leaks in the axial direction from the space without the first magnetic body.

  However, since this drive device is disposed on one axial side of at least one of the first permanent magnet and the first magnetic body, these leakage magnetic flux flows into the second magnetic body. As a result, when a magnetic attraction force is generated between the first permanent magnet and the second magnetic body and no electromagnetic force acts on the moving member, the moving member causes the second magnetic body to move. That is, it is adsorbed while being in contact with the fixed member. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

Here, the axial direction means the moving direction of the moving member. Further, the direction perpendicular to the axial direction means a direction perpendicular to the moving axis of the moving member. Therefore, these expressions do not limit that each member is cylindrical or annular.
According to a second aspect of the present invention, the driving apparatus according to the first aspect further includes at least one second permanent magnet provided on the second magnetic body side in the axial direction of the moving member.

  In this drive device, since the moving member is provided with the second permanent magnet, a magnetic attractive force is generated between the first and second permanent magnets and the second magnetic body. And since the 2nd permanent magnet is provided in addition to the 1st permanent magnet, compared with the case where only the 1st permanent magnet is provided, magnetic attraction force becomes larger. As a result, when the electromagnetic force is not acting on the moving member, the moving member is adsorbed in a state of being in contact with the fixed member by the magnetic attraction force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

According to a third aspect of the present invention, the drive device according to the first or second aspect further includes at least one third permanent magnet provided on the fixed member and disposed on the opposite side to the second magnetic body of the moving member. Yes.
In this drive device, since the third permanent magnet is provided on the fixed member, when the third permanent magnet is magnetized so as to repel the first permanent magnet, the shaft is interposed between the first and third permanent magnets. Magnetic repulsive force in the direction is generated. And since the 3rd permanent magnet is arrange | positioned in the axial direction opposite side to the 2nd magnetic body of a moving member, the magnetic repulsive force of a 1st and 3rd permanent magnet is the magnetism of a 1st permanent magnet and a 2nd magnetic body. The magnetic biasing force acting on the moving member is increased by acting toward the same side in the axial direction as the general attractive force. As a result, when the electromagnetic force is not applied to the moving member, the moving member is attracted and pressed in a state where the moving member is in contact with the fixed member by the magnetic attractive force and the repulsive force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

  The drive device according to claim 4 includes a fixed member, a moving member provided so that the driven member is fixed and movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction, and the fixed member A first permanent magnet provided on the first permanent magnet, a first magnetic body provided on the fixed member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction, and a first member provided on the moving member. A coil disposed between a direction perpendicular to the axial direction of the permanent magnet and the first magnetic body, and a fixed member, and disposed on one axial direction side of at least one of the first permanent magnet and the first magnetic body. At least one second magnetic body and at least one second permanent magnet provided on the second magnetic body side in the axial direction of the moving member.

  In this drive device, the leakage magnetic flux from the first permanent magnet flows into the second magnetic body. As a result, when a magnetic attraction force is generated between the second permanent magnet provided on the moving member and the second magnetic body, and no electromagnetic force is acting on the moving member, the magnetic attraction force moves. The member is adsorbed while being in contact with the second magnetic body, that is, the fixed member. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

According to a fifth aspect of the present invention, the drive device according to the fourth aspect further includes at least one third permanent magnet provided on the fixed member and disposed on the opposite side to the second magnetic body of the moving member.
In this drive device, since the third permanent magnet is provided on the fixed member, when the third permanent magnet is magnetized so as to repel the first permanent magnet, the shaft is interposed between the first and third permanent magnets. Magnetic repulsive force in the direction is generated. That is, a magnetic attractive force is generated between the first permanent magnet and the second magnetic body, and a magnetic repulsive force is generated between the first permanent magnet and the third permanent magnet. And since the 3rd permanent magnet is arrange | positioned on the opposite side to the 2nd magnetic body of a moving member, a magnetic attractive force and a magnetic repulsive force act toward the same side of an axial direction, and a moving member The magnetic biasing force acting on the is increased. As a result, when the magnetic urging force by the coil is not generated, the moving member is more reliably attracted and pressed in a state where the moving member is in contact with the fixed member by the magnetic attractive force and the repulsive force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

According to a sixth aspect of the present invention, in the drive device according to any one of the first to fifth aspects, the second magnetic body is substantially at a position in a direction perpendicular to the axial direction with respect to at least one of the first permanent magnet and the first magnetic body. Are identical.
In this drive device, since the magnetic flux leakage from the first permanent magnet surely flows into the second magnetic body, the magnetic attractive force is more reliably generated.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the second magnetic body is substantially the same in position in the direction perpendicular to the axial direction of the coil.
In this drive device, the position of the second magnetic body in the direction perpendicular to the axial direction of the coil is substantially the same. Therefore, the direction of the direction perpendicular to the axial direction of the space without the first magnetic body and the second magnetic body. The position is substantially the same. Thereby, since the magnetic flux leakage from the first permanent magnet surely flows into the second magnetic body, the magnetic attractive force is more reliably generated.

According to an eighth aspect of the present invention, the driving device according to any one of the first to seventh aspects includes a first fixing portion in which the fixing member can abut against the moving member in the axial direction. The second magnetic body is disposed on the opposite side to the moving member of the first fixed portion in the axial direction.
In this drive device, since the second magnetic body is disposed on the opposite side of the moving member of the first fixed portion in the axial direction, for example, the moving member is generated by a magnetic attractive force between the first permanent magnet and the second magnetic body. However, the first permanent magnet and the second magnetic body are not in direct contact with each other. As a result, it is possible to reduce the required urging force when the moving member is detached from the first fixed portion, and it is possible to reduce the power consumption of the drive device.

A drive device according to a ninth aspect of the present invention is the drive device according to any one of the first to eighth aspects, wherein the position detection permanent magnet is provided on the second magnetic body side in the axial direction of the moving member, and the position detection permanent magnet is provided on the fixed member. And a position detection sensor for detecting the position of the moving member in the axial direction via a position detecting permanent magnet.
In this drive device, since the position detection permanent magnet is provided on the moving member, for example, when the position detection permanent magnet is magnetized so as to attract the second magnetic body, the position detection permanent magnet A magnetic attractive force is generated between the two magnetic bodies. That is, a magnetic attractive force can be obtained by using a permanent magnet for position detection.

  The driving device according to claim 10, a fixed member, a moving member provided so that the driven member is fixed and movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction, and the moving member A first permanent magnet provided on the movable member, a first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction, and a first permanent magnet provided on the fixed member. And a coil disposed between the direction perpendicular to the axial direction of the first magnetic body and the fixing member, and disposed on one axial direction side of at least one of the first permanent magnet and the first magnetic body. And at least one fourth permanent magnet.

  In this drive device, an axial magnetic attractive force is generated between the first and fourth permanent magnets. As a result, when no electromagnetic force is acting on the moving member, the moving member is attracted to the fixed member by the magnetic attraction force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

The drive device according to an eleventh aspect of the present invention is the drive device according to the tenth aspect, further comprising at least one second permanent magnet provided on the fourth permanent magnet side in the axial direction of the moving member.
In this drive device, since the moving member is provided with the second permanent magnet, when the second permanent magnet is magnetized so as to attract the fourth permanent magnet, the second permanent magnet and the fourth permanent magnet Magnetic attraction force is generated during this period. And since the 2nd permanent magnet is provided in addition to the 1st permanent magnet, compared with the case where only the 1st permanent magnet is provided, magnetic attraction force becomes larger. As a result, when no electromagnetic force is acting on the moving member, the moving member is attracted to the fixed member by the magnetic attraction force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

A drive device according to a twelfth aspect is the drive device according to the tenth or eleventh aspect, further comprising at least one third permanent magnet provided on the fixed member and disposed on the opposite side to the fourth permanent magnet with respect to the moving member. I have.
In this drive device, since the third permanent magnet is provided on the fixed member, when the third permanent magnet is magnetized so as to repel the first permanent magnet, the shaft is interposed between the first and third permanent magnets. Magnetic repulsive force in the direction is generated. Since the third permanent magnet is arranged on the side opposite to the fourth permanent magnet of the moving member, the magnetic repulsive force of the first and third permanent magnets is the magnetic attraction of the first and fourth permanent magnets. Acting on the same side of force and axial direction. As a result, when no electromagnetic force is acting on the moving member, the moving member is attracted and pressed against the fixed member by the magnetic attractive force and the repulsive force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

  The driving device according to claim 13 includes a fixing member, a moving member provided so that the driven member is fixed and movable in the axial direction with respect to the fixing member, and can be contacted in the axial direction, and the fixing member A first permanent magnet provided on the first permanent magnet, a first magnetic body provided on the fixed member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction, and a first member provided on the moving member. A coil disposed between a direction perpendicular to the axial direction of the permanent magnet and the first magnetic body, and a fixed member, and disposed on one axial direction side of at least one of the first permanent magnet and the first magnetic body. And at least one fourth permanent magnet provided on the side of the fourth permanent magnet in the axial direction of the moving member.

  In this drive device, a magnetic attractive force is generated between the second permanent magnet and the fourth permanent magnet. As a result, when no electromagnetic force is acting on the moving member, the moving member is attracted to the fixed member by the magnetic attraction force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

A drive device according to a fourteenth aspect of the present invention is the drive device according to the thirteenth aspect, further comprising at least one third permanent magnet provided on the fixed member and disposed on the opposite side to the fourth permanent magnet with respect to the moving member. Yes.
In this drive device, since the third permanent magnet is provided on the fixed member, when the third permanent magnet is magnetized so as to repel the fourth permanent magnet, the magnet is interposed between the second and fourth permanent magnets. A magnetic attractive force is generated, and an axial magnetic repulsive force is generated between the third and fourth permanent magnets. And since the 3rd permanent magnet is arranged on the side opposite to the 4th permanent magnet with respect to the moving member, the magnetic attractive force and the magnetic repulsive force act toward the same side in the axial direction, The magnetic biasing force acting on the moving member is further increased. As a result, when no electromagnetic force is acting on the moving member, the moving member is reliably attracted and pressed by the fixed member by the magnetic attractive force and the repulsive force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

According to a fifteenth aspect of the present invention, in the drive device according to any one of the tenth to fourteenth aspects, the fourth permanent magnet is substantially at a position in a direction perpendicular to the axial direction from at least one of the first permanent magnet and the first magnetic body. Are identical.
According to a sixteenth aspect of the present invention, in any one of the tenth to fifteenth aspects, the position of the fourth permanent magnet in the direction perpendicular to the coil and the axial direction is substantially the same.

According to a seventeenth aspect of the present invention, in any one of the tenth to sixteenth aspects, the fixing member has a first fixing portion that can abut on the moving member in the axial direction. The fourth permanent magnet is arranged on the side opposite to the moving member of the first fixed portion in the axial direction.
In this drive device, since the fourth permanent magnet is disposed on the opposite side in the axial direction from the moving member of the first fixed portion, for example, the moving member is generated by a magnetic attractive force between the second permanent magnet and the fourth permanent magnet. Is attracted to the first fixed portion, but the second permanent magnet and the fourth permanent magnet are not in direct contact with each other. As a result, it is possible to reduce the required urging force when the moving member is detached from the first fixed portion, and it is possible to reduce the power consumption of the drive device.

A drive device according to an eighteenth aspect is the drive device according to any one of the tenth to seventeenth aspects, wherein the position detection permanent magnet is provided on the moving member in the axial direction fourth permanent magnet side, and the position detection permanent is provided on the fixed member. A position detection sensor is further provided that is disposed to face the magnet in a direction perpendicular to the axial direction and detects the axial position of the moving member via a position detecting permanent magnet.
In this drive device, since the position detection permanent magnet is provided on the moving member, for example, when the position detection permanent magnet and the fourth permanent magnet are magnetized so as to attract each other, the position detection permanent magnet is used. And a fourth permanent magnet generate a magnetic attractive force. That is, a magnetic attractive force can be obtained by using a permanent magnet for position detection.

  The drive device according to claim 19 is provided with a fixed member, a moving member provided so as to be movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction, and a first provided in the moving member A permanent magnet, a first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction, and a fixed member provided with the first permanent magnet and the first magnetic A coil disposed between a direction perpendicular to the axial direction of the body and at least one of the first permanent magnet and at least one of the first magnetic body disposed in the axial direction, provided on the fixing member. And a third permanent magnet.

  In this drive device, since the third permanent magnet is provided on the fixed member, when the third permanent magnet is magnetized so as to repel the first permanent magnet, a magnetic force is generated between the first and third permanent magnets. Repulsive force is generated. As a result, when no electromagnetic force acts on the moving member, the moving member is pressed against the fixed member by the magnetic repulsive force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

  The driving device according to claim 20, a fixed member, a moving member provided so that the driven member is fixed and movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction, and the fixed member A first permanent magnet provided on the fixed member, a first magnetic body provided on the fixed member so as to face the first permanent magnet in a direction perpendicular to the axial direction, and a first permanent magnet provided on the moving member. And a coil disposed between the direction perpendicular to the axial direction of the first magnetic body, at least one second permanent magnet provided on the moving member, and at least one third permanent magnet provided on the fixed member; It has.

  In this drive device, a magnetic repulsive force is generated in the axial direction between the second and second permanent magnets. As a result, when no electromagnetic force acts on the moving member, the moving member is pressed against the fixed member by the magnetic repulsive force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

According to a twenty-first aspect of the present invention, in the drive device according to the nineteenth or twentieth aspect, the position detection permanent magnet provided on the moving member and the position detection permanent magnet provided on the fixed member are opposed to each other in a direction perpendicular to the axial direction. And a position detection sensor for detecting the axial position of the moving member via a position detecting permanent magnet.
In this drive device, since the position detection permanent magnet is provided on the moving member, for example, when the position detection permanent magnet and the third permanent magnet are magnetized so as to repel each other, the position detection permanent magnet A magnetic repulsive force is generated between the third permanent magnet. As a result, when no electromagnetic force acts on the moving member, the moving member is pressed against the fixed member by the magnetic repulsive force. Thereby, in a state where the power of the driving device is turned off, the relative movement between the fixed member and the moving member can be prevented, and the position of the moving member can be stabilized.

A drive device according to a twenty-second aspect is the drive device according to any one of the first to twenty-first aspects, wherein the fixed member is disposed on the outer peripheral side of the first magnetic body, and at least one of the moving member, the first permanent magnet, and the first magnetic body. One has a cylindrical guide wall that abuts in a direction perpendicular to the axial direction.
In this drive device, since the fixing member has a guide wall, it is not necessary to provide guide means as a separate member from the fixing member, and the number of parts can be reduced.

The image pickup apparatus according to claim 23, wherein at least one lens constituting at least part of the image pickup optical system, an image pickup element disposed on an optical path of the image pickup optical system, and the lens with respect to the image pickup optical axis A drive device according to claims 1 to 22 for driving in a direction.
Since the image pickup apparatus includes the drive device according to any one of claims 1 to 22, for example, even when the power is turned off by a digital camera or the like, the moving member is attracted or pressed by the fixed member to prevent the moving member from rattling. can do.

The imaging device according to a twenty-fourth aspect is the imaging device according to the twenty-third aspect, wherein in the imaging optical system, the lens is disposed so as to be in a pan focus position in a state where the moving member is in contact with the fixed member in the axial direction.
In this imaging apparatus, even when the power is turned off when used in pan focus, the moving member is attracted or pressed by the fixed member, so that the pan focus state can be maintained. That is, power consumption can be reduced.

  An imaging device according to a twenty-fifth aspect is the imaging device according to the twenty-fourth aspect, wherein the first adjustment member provided on the fixing member and the first adjustment member provided on the second magnetic body and disposed opposite the first adjustment member in the optical axis direction. Two adjustment members, a first adjustment screw which is provided in any one of the first and second adjustment members so as to be immovable and rotatable in the optical axis direction, and screwed with the other in the optical axis direction; The adjusting mechanism further includes a first urging member disposed between the two adjusting members so as to be elastically deformable in the optical axis direction.

In this imaging device, the distance in the optical axis direction between the first and second adjustment members can be adjusted by the first adjustment screw and the first biasing member. That is, the distance between the fixing member and the second magnetic body can be adjusted. Thereby, the setting of the magnetic attraction force by the second magnetic body can be adjusted.
A drive device according to a twenty-sixth aspect is the drive device according to the twenty-fifth aspect, wherein the first urging member is an elastic member, and the first adjustment screw is inserted into the first urging member.

  According to a twenty-seventh aspect of the present invention, there is provided the imaging device according to the twenty-fifth or twenty-sixth aspect, wherein the adjustment mechanism is provided in the imaging element and is disposed opposite the first adjustment member in the optical axis direction. An optical axis direction is provided between the first and third adjustment members, and a second adjustment screw that is provided in any one of the three adjustment members so as to be immovable and rotatable in the optical axis direction and is screwed with the other in the optical axis direction. And a second urging member arranged so as to be elastically deformable.

In this imaging apparatus, the distance in the optical axis direction between the first and third adjustment members can be adjusted by the second adjustment screw and the second urging member. That is, the distance between the fixing member and the image sensor can be adjusted.
The imaging device according to a twenty-eighth aspect is the imaging device according to the twenty-fourth aspect, wherein a first adjustment member provided on the fixing member and a third adjustment provided on the imaging element and disposed opposite the first adjustment member in the optical axis direction. A member, a second adjustment screw that is immovable and rotatable in one of the first and third adjustment members in the optical axis direction, and is screwed into the other in the optical axis direction; and first and third adjustments The adjusting mechanism further includes a second urging member disposed between the members so as to be elastically deformable in the optical axis direction.

In this imaging apparatus, the distance in the optical axis direction between the first and third adjustment members can be adjusted by the second adjustment screw and the second urging member. That is, the distance between the fixing member and the image sensor can be adjusted.
According to a twenty-ninth aspect of the present invention, in the twenty-seventh or twenty-eighth aspect, the second urging member is an elastic member, and the second adjustment screw is inserted into the second urging member.

  The control method of the drive device according to claim 30 includes: a fixed member; and a moving member that is fixed to the driven member and is movable in the axial direction with respect to the fixed member and is capable of contacting in the axial direction. A first permanent magnet provided on the moving member, a first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction, and a first permanent magnet provided on the fixed member. A coil disposed between the magnet and the first magnetic body in a direction perpendicular to the axial direction, and a fixed member provided on at least one axial side of the first permanent magnet and the first magnetic body. This is a method for controlling a driving device including at least one second magnetic body. The drive device further includes control means including a drive unit that drives the moving member. This control method includes a moving step in which the moving member is moved to or near the stroke end on the second magnetic body side in the axial direction, and the moving member is moved to or near the stroke end before stopping energization of the coil. And a stopping step of stopping energization of the coil.

  In this control method, since the energization to the coil is stopped after the moving member is moved to the stroke end on the second magnetic body side or the vicinity thereof, the magnetic attractive force between the first permanent magnet and the second magnetic body is reduced. In a large state, the electromagnetic force does not act on the moving member. Thereby, in the state where the power supply of the drive device is turned off, the relative movement between the fixed member and the moving member can be prevented more reliably, and the position of the moving member can be stabilized.

  The control method of the drive device according to claim 31 includes: a fixed member; and a moving member that is fixed to the driven member and is movable in the axial direction with respect to the fixed member and is capable of contacting in the axial direction. A first permanent magnet provided on the moving member, a first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction, and a first permanent magnet provided on the fixed member. A coil disposed between the magnet and the first magnetic body in a direction perpendicular to the axial direction, and a fixed member provided on at least one axial side of the first permanent magnet and the first magnetic body. This is a method for controlling a driving device including at least one second magnetic body. The drive device further includes control means including a drive unit that drives the moving member. Before stopping energization of the coil, the position detecting step for detecting the axial position of the moving member is compared with the axial position of the moving member detected in the position detecting step and a preset target position. In accordance with a determination step in which it is determined whether the moving member is positioned on the second magnetic body side in the axial direction with respect to the target position and the determination result in the determination step, the axial position of the moving member is second than the target position or the target position. A moving step for moving the moving member to the second magnetic body in the axial direction to the target position when the magnetic member is located on the opposite side of the magnetic body, and a stop for stopping energization of the coil after moving the moving member to the target position Process.

  In this control method, the energization of the coil is stopped after moving the moving member to the target position. Therefore, if the target position is set to such a degree that a large magnetic attractive force can be maintained, the energization of the coil is stopped. Also, the moving member is reliably adsorbed to the fixed member. Thereby, in the state where the power supply of the drive device is turned off, the relative movement between the fixed member and the moving member can be prevented more reliably, and the position of the moving member can be stabilized.

In the drive device according to the present invention, it is possible to stabilize the position of the moving member when the power is turned off by using the magnetic attractive force and the repulsive force.
In the drive device according to the present invention, the power consumption can be reduced by utilizing the magnetic attractive force and the repulsive force.
Furthermore, since the drive device control method according to the present invention has the above-described configuration, the position of the moving member can be stabilized when the drive device is turned off when the magnetic attractive force and the repulsive force are used. This can be achieved more reliably.

A drive device according to the present invention will be described below with reference to the drawings.
A. Regarding the configuration of the imaging apparatus First Embodiment (1) Configuration of Imaging Device FIG. 1 shows a schematic cross-sectional view of an imaging device 100 as a first embodiment of the present invention. Hereinafter, the upper side in FIG. 1 is expressed as the upper side in the optical axis direction, and the lower side is expressed as the lower side in the optical axis direction, but these do not limit the mounting state of the imaging apparatus 100. As shown in FIG. 1, the imaging device 100 includes a fixed member 6, a lens frame 4 (moving member), a first permanent magnet 9, a first yoke 8 (first magnetic body), a coil 10, A two-yoke 11 (second magnetic body) and three lenses 1, 2, and 3 are provided.

  The fixing member 6 is a member that serves as a casing of the imaging device 100, and includes a first fixing portion 6b, a second fixing portion 6c, and a third fixing portion 6a. The 3rd fixing | fixed part 6a is a cylindrical part extended in an axial direction, and each member is accommodated in the inner peripheral side. The first fixing portion 6b and the second fixing portion 6c are, for example, annular and plate-like portions, and are disposed at both ends in the optical axis direction of the lens frame 4 described later. The third fixing portion 6a is a cylindrical portion for connecting the first and second fixing portions 6b and 6c in the optical axis direction. The lens frame 4 is a cylindrical member disposed inside the fixed member 6, and is provided so as to be movable in the axial direction and capable of contacting in the axial direction with respect to the fixed member. Specifically, the fixing member 6 is provided with guide poles 7a and 7b extending in the optical axis direction (vertical direction in FIG. 1), and is fitted into a hole (not shown) provided in the lens frame 4. ing. The fixed member 6, the lens frame 4, the first permanent magnet 9, the first yoke 8, and the second yoke 11 constitute a drive device.

  In the lens frame 4, lenses 1, 2, and 3 as driven members constituting a part of the imaging optical system are accommodated and fixed. The lenses 1, 2, and 3 are arranged in parallel in the optical axis direction. Has been. A positioning spacer 5 is disposed between the lenses 2 and 3. Further, an imaging element (not shown) is disposed on the optical path of the imaging optical system so as to face the lens 3 below the fixing member 6 in the optical axis direction.

The first permanent magnet 9, the first yoke 8 and the coil 10 constitute a voice coil motor 16. This imaging device 100 is a magnet drive system, and the first permanent magnet 9 and the first yoke 8 are fixed to the lens frame 4 and the coil 10 is fixed to the fixing member 6.
The first yoke 8 is a cylindrical magnetic body fixed to the outer periphery of the lens frame 4. The first yoke 8 is integrally formed from, for example, a single plate, and has an inner peripheral cylindrical portion 8a, an outer peripheral cylindrical portion 8b, and an intermediate portion 8c. The inner peripheral cylindrical portion 8a and the outer peripheral cylindrical portion 8b are cylindrical portions extending in the optical axis direction and having different diameters, and are connected by an intermediate portion 8c disposed on one side in the optical axis direction. The inner peripheral cylindrical portion 8 a is fixed to the outer peripheral portion of the lens frame 4. A gap is secured between the inner peripheral cylindrical portion 8a and the outer peripheral cylindrical portion 8b in a direction perpendicular to the axial direction.

The 1st permanent magnet 9 is a cylindrical magnet fixed to the internal peripheral surface of the outer peripheral side cylindrical part 8b, and is magnetized in the direction perpendicular | vertical to an axial direction. The 1st permanent magnet 9 and the inner peripheral side cylindrical part 8a are arrange | positioned facing the direction perpendicular | vertical to an axial direction. The coil 10 is wound around a member on the fixed member 6 side, and is disposed between the first permanent magnet 9 and the inner peripheral side tubular portion 8a in a direction perpendicular to the axial direction.
The lens frame 4 can be driven in the optical axis direction with respect to the fixed member 6 by the voice coil motor constituted by the first permanent magnet 9, the first yoke 8 and the coil 10 described above.

  Further, the imaging apparatus 100 is characterized in that a second yoke 11 is further provided in addition to the first yoke 8. Specifically, the second yoke 11 is an annular and plate-like magnetic body, and is arranged so that leakage magnetic flux from the first permanent magnet 9 and the first yoke 8 can flow. More specifically, the second yoke 11 is arranged on one side in the optical axis direction of the first permanent magnet 9 via the first fixing portion 6b of the fixing member 6, and the optical axis direction of the first fixing portion 6b. It is fixed to the end of the. The positions of the second yoke 11 and the first permanent magnet 9 in the direction perpendicular to the axial direction are substantially the same.

(2) Operation Next, a driving method of the imaging device 1 of the present embodiment will be described. When the coil 10 is energized, an electromagnetic force in the optical axis direction is generated between the first permanent magnet 9 and the coil 10. As a result, an electromagnetic force acts on the first permanent magnet 9 and the coil 10 in the optical axis direction. As a result, the lens frame 4 is driven in the optical axis direction with respect to the fixed member 6.

  In the imaging apparatus 100, a magnetic urging force is generated by the second yoke 11 in addition to the electromagnetic force generated by the voice coil motor 16. Specifically, for example, when the outer peripheral side of the first permanent magnet 9 is an N pole, most of the magnetic flux generated from the first permanent magnet 9 flows into the first yoke 8 in contact with the inner peripheral side. Return to the S pole. However, a part of the magnetic flux does not flow into the first yoke 8 and leaks into a space where the first yoke 8 does not exist, more specifically, a space below the first permanent magnet 9 in the optical axis direction.

  However, in this imaging apparatus 100, since the second yoke 11 is disposed on the lower side in the optical axis direction of the first permanent magnet 9, these leakage magnetic flux flows into the second yoke 11, and the first permanent magnet 9 and A magnetic attractive force is generated between the second yoke 11 and the second yoke 11. As a result, when no electromagnetic force is generated in the voice coil motor 16, the lens frame 4 is attracted to the fixed member 6 by this magnetic attraction force. More specifically, when the power of the imaging apparatus 100 is turned off, the lens frame 4 moves downward in the optical axis direction and is attracted while being in contact with the first fixing portion 6b of the fixing member 6. By setting the magnitude of the magnetic attractive force to such an extent that the weight of the lens frame 4 and the voice coil motor 16 can be supported, the lens frame 4 can be attached to the first fixing portion 6b even when the power of the imaging apparatus 100 is turned off. And can be integrated. As a result, relative movement between the fixing member 6 and the lens frame 4 can be prevented and the position of the lens frame 4 can be stabilized in a state where the power of the imaging apparatus 100 is turned off.

In addition, since the imaging device 100 of the present embodiment is provided with the second yoke 11, the dimension in the optical axis direction can be shortened compared to the case where an urging means such as a compression spring is provided.
In the present embodiment, the generation source of the magnetic flux is only the first permanent magnet 9 constituting the voice coil motor 16. However, the present invention is not limited to this, and a plurality of magnets magnetized in an arbitrary direction on the lens frame 4. A permanent magnet may be attached. Moreover, although the 2nd yoke 11 is described as a cyclic | annular and plate-shaped member, you may be comprised from the some member.

2. Second Embodiment In the first embodiment described above, the magnetic attractive force generated between the first permanent magnet 9 and the second yoke 11 is used. Two permanent magnets 20 may be provided. In FIG. 2, the cross-sectional schematic of the imaging device 100 as 2nd Embodiment of this invention is shown.
As shown in FIG. 2, the second permanent magnet 20 is an annular permanent magnet, and is fixed to the outer peripheral portion of the inner peripheral tubular portion 8 a of the first yoke 8 and on the second yoke 11 side in the optical axis direction. ing. The magnetization direction of the second permanent magnet 20 may be any direction.

  In this case, in addition to the magnetic attractive force between the first permanent magnet 9 and the second yoke 11, a magnetic attractive force is also generated between the second permanent magnet 20 and the second yoke 11. As a result, the magnetic attractive force can be increased more than in the first embodiment. Thereby, in a state where the power of the imaging apparatus 100 is turned off, the relative movement between the fixing member 6 and the lens frame 4 can be more reliably prevented, and the position of the lens frame 4 can be stabilized.

3. Third Embodiment In the first embodiment described above, only the magnetic attractive force is used, but a case where a repulsive force is used is also conceivable. FIG. 3 shows a schematic cross-sectional view of an imaging apparatus 1 as a third embodiment of the present invention.
As shown in FIG. 3, in this embodiment, a third permanent magnet 21 is provided on the fixed member 6 side instead of the second yoke 11 of the first embodiment. The third permanent magnet 21 is an annular and plate-shaped magnet, and is fixed to the first permanent magnet 9 side of the second fixing portion 6c. In other words, the third permanent magnet 21 is disposed on the opposite side of the lens frame 4 from the second yoke 11 of the first embodiment in the optical axis direction. The third permanent magnet 21 is magnetized so as to repel each other with the first permanent magnet 9.

  In this case, since a magnetic repulsive force is generated between the first permanent magnet 9 and the first yoke 8 and the third permanent magnet 21, the lens frame 4 can be used when no electromagnetic force is generated in the voice coil motor 16. Is urged downward in the optical axis direction and is pressed in a state of being in contact with the first fixing portion 6b. As a result, relative movement between the fixing member 6 and the lens frame 4 can be prevented and the position of the lens frame 4 can be stabilized in a state where the power of the imaging apparatus 100 is turned off.

In the imaging apparatus 100 according to the present embodiment, since the third permanent magnet 21 is provided, the dimension in the optical axis direction can be shortened compared to the case where an urging means such as a compression spring is provided.
4). Fourth Embodiment In the third embodiment described above, the third permanent magnet 21 is provided in place of the second yoke 11 of the first embodiment. However, as shown in FIG. 4, the second yoke 11 and the third permanent magnet are provided. 21 may be provided. Specifically, as shown in FIG. 4, the second yoke 11 is fixed to the first fixing portion 6b of the fixing member 6 as in the first embodiment. The 3rd permanent magnet 21 is being fixed to the 2nd fixing | fixed part 6c similarly to 3rd Embodiment.

  In this case, a magnetic attractive force is generated between the first permanent magnet 9 and the second yoke 11, and a magnetic repulsive force is generated between the first permanent magnet 9 and the third permanent magnet. That is, in the present embodiment, a biasing force downward in the optical axis direction acts on the lens frame 4 by these magnetic attractive force and repulsive force. As a result, when no electromagnetic force is generated in the voice coil motor 16, the lens frame 4 is attracted and pressed by the fixing member 6. More specifically, when the power of the imaging apparatus 100 is turned off, the lens frame 4 moves downward in the optical axis direction and is attracted and pressed in a state of being in contact with the first fixed portion 6b. Thereby, in a state where the power of the imaging apparatus 100 is turned off, the relative movement between the fixing member 6 and the lens frame 4 can be more reliably prevented, and the position of the lens frame 4 can be stabilized.

In the imaging device 100 of the fourth embodiment, the same function and effect can be obtained even if the second permanent magnet 20 is provided as in the second embodiment. In this case, a magnetic attractive force between the first permanent magnet 9 and the second yoke 11 or a magnetic repulsive force between the first permanent magnet 9 and the third permanent magnet 21 is further increased by the second permanent magnet 20. Can be bigger.
5. Fifth Embodiment In the above-described embodiment, the imaging apparatus 100 is a magnet drive system, but may be a coil drive system. FIG. 5 shows a schematic cross-sectional view of an imaging apparatus 100 as the fifth embodiment of the present invention.

  The imaging apparatus 100 of the present embodiment has a configuration that is substantially equal to that of the first embodiment described above, but the coil is provided on the lens frame (moving member) side, and the first permanent magnet is provided on the fixed member side. Is different. Specifically, as shown in FIG. 5, the first permanent magnet 9 and the first yoke 8 are fixed to the fixing member 6. On the other hand, the coil 10 is fixed to the lens frame 4. The second yoke 11 is fixed to the first fixing portion 6b of the fixing member 6 as in the first embodiment.

  In this imaging apparatus 100, since the first permanent magnet 9 is provided on the fixed member 6 side, the lens frame 4 is attracted to the first fixed portion 6b side of the fixed member 6 even if the second yoke 11 is provided. I can't. Therefore, in the present embodiment, the second permanent magnet 12 is provided on the lens frame 4. Specifically, the second permanent magnet 12 is an annular and plate-shaped magnet, and is fixed to the second yoke 11 side of the lens frame 4 in the optical axis direction. The second permanent magnet 12 is magnetized so as to generate a magnetic attractive force between the second permanent magnet 12 and the second yoke 11.

In this case, the lens frame 4 is attracted to the fixed member 6 by a magnetic attractive force generated between the second permanent magnet 12 and the second yoke 11. As a result, relative movement between the fixing member 6 and the lens frame 4 can be prevented and the position of the lens frame 4 can be stabilized in a state where the power of the imaging apparatus 100 is turned off.
Further, since the total weight of the coil 10 and the second permanent magnet 12 is smaller than the total weight of the first yoke 8 and the first permanent magnet 9 forming the voice coil motor 16, the weight of the lens frame 4 is reduced. it can. As a result, the driving force to be generated by the voice coil motor 16 can be reduced, and the image pickup apparatus can be reduced in size.

In addition, since the imaging device 100 of the present embodiment is provided with the second permanent magnet 12 and the second yoke 11, the dimension in the optical axis direction can be shortened compared to the case where an urging means such as a compression spring is provided. Can do.
In the present embodiment, the second permanent magnet 12 is attached to the lens frame 4. However, the present invention is not limited to this, and the above-described principle is established by attaching the second permanent magnet 12 to a member fixed to the lens frame 4 such as the coil 10. To do.

6). Sixth Embodiment In the fifth embodiment described above, only the magnetic attractive force is used. However, a case where a repulsive force is used is also considered. FIG. 6 shows a schematic cross-sectional view of an imaging apparatus 1 as a sixth embodiment of the present invention.
As shown in FIG. 6, in this embodiment, a third permanent magnet 21 is provided on the fixed member 6 side instead of the second yoke 11 of the fifth embodiment. The third permanent magnet 21 is an annular and plate-shaped magnet, and is fixed to the first permanent magnet 9 side of the second fixing portion 6c. In other words, the third permanent magnet 21 is disposed on the opposite side of the lens frame 4 from the second yoke 11 of the fifth embodiment in the optical axis direction. The third permanent magnet 21 is magnetized so as to generate a magnetic repulsion force between the third permanent magnet 21 and the second permanent magnet 12.

  In this case, since a magnetic repulsive force is generated between the second permanent magnet 12 and the third permanent magnet 21, when no electromagnetic force is generated in the voice coil motor 16, the lens frame 4 is lowered in the optical axis direction. And is adsorbed while being in contact with the first fixed portion 6b. As a result, relative movement between the fixing member 6 and the lens frame 4 can be prevented and the position of the lens frame 4 can be stabilized in a state where the power of the imaging apparatus 100 is turned off.

In the imaging apparatus 100 according to the present embodiment, since the third permanent magnet 21 is provided, the dimension in the optical axis direction can be shortened compared to the case where an urging means such as a compression spring is provided.
Although the second permanent magnet 12 is provided on the side opposite to the third permanent magnet 21 of the lens frame 4, it may be provided on the third permanent magnet 21 side of the lens frame 4.
7). Seventh Embodiment In the above-described sixth embodiment, the third permanent magnet 21 is provided in place of the second yoke 11, but as shown in FIG. 7, both the second yoke 11 and the third permanent magnet 21 are provided. It may be provided. Specifically, the second yoke 11 is fixed to the first fixing portion 6b of the fixing member 6 as in the fifth embodiment. The 3rd permanent magnet 21 is being fixed to the 2nd fixing | fixed part 6c similarly to 6th Embodiment. Moreover, the 2nd permanent magnet 12 is being fixed to the lens frame 4 similarly to 5th Embodiment.

  In this case, a magnetic attractive force is generated between the second permanent magnet 12 and the second yoke 11, and a magnetic repulsive force is generated between the second permanent magnet 12 and the third permanent magnet 21. That is, in the present embodiment, a biasing force downward in the optical axis direction acts on the lens frame 4 by these magnetic attractive force and repulsive force. As a result, when no electromagnetic force is generated in the voice coil motor 16, the lens frame 4 is attracted and pressed by the fixing member 6. More specifically, when the power of the imaging apparatus 100 is turned off, the lens frame 4 moves downward in the optical axis direction and stops in a state where the lens frame 4 is in contact with the first fixed portion 6b. Thereby, in a state where the power of the imaging apparatus 100 is turned off, the relative movement between the fixing member 6 and the lens frame 4 can be more reliably prevented, and the position of the lens frame 4 can be stabilized.

  Moreover, the imaging device 100 of 1st-7th embodiment can acquire the effect which is demonstrated below other than the effect described above. FIG. 8 shows the positional relationship between the lens and the image sensor. 8A to 8C show states in which the distance between the lens and the image sensor and the focus position 33 are different. Normally, when the position of the lens 32 is changed with respect to the image sensor 15, the focus position 33 changes as shown in FIGS. 8B and 8C. However, in the case of a single focus lens or the like, when the lens 32 is at a specific position with respect to the image sensor 15, more specifically, when the lens 32 is close to the image sensor 15, the arrow in FIG. As shown, focusing is performed in the entire range farther away from the focusing position 33. This state is so-called pan focus.

  The pan focus position is used, for example, when shooting far away or when shooting moving images. Conventionally, the lens position is held at the pan focus position while the coil is energized. Therefore, when pan focus shooting is performed for a long time, it is necessary to energize the coil for a long time even when the lens is not moved. Therefore, the conventional imaging apparatus tends to increase power consumption.

However, in this imaging device 100, when the state in which the lens frame 4 is in contact with the first fixing portion 6b of the fixing member 6 is set to be the pan focus position of the lenses 1 to 3, the imaging device 100 is used during pan focus shooting. Even if no current is supplied to the lens, the lens position can be held at the pan focus position. Thereby, power consumption can be reduced significantly.
B. Control of imaging device Eighth Embodiment Since the imaging device 100 according to the first to seventh embodiments described above uses the second yoke 11, the second permanent magnet 12, and the third permanent magnet 21, a nonlinear urging force corresponding to the displacement. Acts on the lens frame 4. Therefore, the control means of the driving device needs to be devised compared to the conventional urging means in which the urging force is linear. Based on the imaging device 100 of the first embodiment, positioning control of the lens frame 4 of the present embodiment will be described.

  The imaging apparatus 100 when performing positioning control further includes a drive control unit 50. The drive control unit 50 is for adjusting the position of the lens frame 4 in the optical axis direction in accordance with an external command. FIG. 9 shows a block diagram of the drive control unit 50. As shown in FIG. 9, the drive control unit 50 includes a position detection unit 51, a target position command unit 52, a difference calculation unit 53, a filter processing unit 54, and a drive unit 55.

  The position detector 51 is for detecting the position of the lens frame 4 in the optical axis direction. Specifically, as shown in FIG. 10, it has a position detecting permanent magnet 13 and a position detecting sensor 14. The position detecting permanent magnet 13 is an annular magnet and is fixed to the outer peripheral portion of the outer peripheral cylindrical portion 8 b of the first yoke 8. The fixing member 6 has a support portion 6d having an L-shaped cross section on the outer peripheral side of the first fixing portion 6b, and the position detection sensor 14 is perpendicular to the position detection permanent magnet 13 and the axial direction on the support portion 6d. It is fixed to face the direction. The position detection sensor 14 is a so-called Hall sensor that outputs a voltage corresponding to, for example, a magnetic flux passing therethrough.

  The target position command unit 52 is for calculating and outputting the target position of the lens frame 4 in the optical axis direction according to an external command. The difference calculation unit 53 calculates a difference between the sensor output value output from the position detection unit 51 and the target value output from the target position command unit 52, and outputs the difference as a difference value. The filter processing unit 54 performs a filtering process on the difference value in order to remove the resonance frequency of the difference value, and outputs it as a processed value. The drive unit 55 is for adjusting the electromagnetic force of the voice coil motor 16 according to the processing value, and is connected to the coil 10.

  As shown in FIG. 9, first, a target value is input to the target position command unit 52 and output to the difference calculation unit 53. On the other hand, the position detection sensor 14 detects the magnetic flux from the position detection permanent magnet 13, and the sensor output value is output to the difference calculation unit 53. Specifically, when the position of the position detection permanent magnet 13 in the optical axis direction changes, the distance between the position detection sensor 14 and each magnetic pole of the position detection permanent magnet 13 changes. Accordingly, the magnetic flux penetrating the position detection sensor 14 changes. The change of the magnetic flux is output from the position detection sensor 14 as a sensor output value. Then, the difference calculation unit 53 calculates the difference between the target value and the sensor output value.

The difference value output from the difference calculation unit 53 is subjected to various filter processes by the filter processing unit 54. Specifically, for example, the lead lag filter process is performed in the compensator 54a, and the integral compensation process is further performed in the integrator 54b. The processed values after these filter processes are output to the drive unit 55.
The drive unit 55 adjusts the energization amount to the coil 10 of the voice coil motor 16 so that an electromagnetic force corresponding to the processing value is generated. Here, when an urging force is always applied to the lens frame 4 that is a moving member as in the imaging device 100 according to the present invention, the electromagnetic force that balances the urging force is used to make the lens frame 4 stationary. The force needs to be generated by the voice coil motor 16. In other words, it is possible to adjust the position of the lens frame 4 in the optical axis direction by adjusting the magnitude of the electromagnetic force of the voice coil motor 16. Therefore, in this case, an electromagnetic force is generated in the voice coil motor 16 according to the energization amount determined by the drive unit 55, and the magnetic attractive force generated between the first permanent magnet 9 and the second yoke 11 and the electromagnetic force are generated. The lens frame 4 stops at a position where the force balances. The position of the lens frame 4 in the optical axis direction is detected again by the position detection unit 51, and the position of the lens frame 4 is adjusted according to the flow described above based on the difference from the target value. Thus, in this imaging apparatus 100, the positioning control of the lens frame 4 is performed by feedback control.

  Here, the drive unit 55 will be described in more detail. In the drive unit 55, the energization amount of the coil 10 is adjusted according to the processing value. However, since the urging force acting on the lens frame 4 is nonlinear as described above, the block in the drive unit 55 is different from the conventional one. FIG. 11A shows a block diagram of a drive unit using an urging means in which the urging force of a spring or the like is a linear system, and FIG. 11B shows its frequency characteristics. FIG. 11C shows a block diagram of the drive unit 55 using an urging means whose urging force is non-linear like the imaging device 100, and FIG. 11D shows its frequency characteristics.

  First, the case where the biasing force is linear as in the prior art will be described. As shown in FIG. 11A, the processing value output from the filter processing unit is input to the driving unit as the driving force F1, and the difference between the driving force F1 and an urging force F2 described later is calculated. Then, the calculated force is divided by the total mass m of the moving member (the lens frame 4 and the member attached to the lens frame 4). Thus, the calculated force is converted into the acceleration a of the lens frame 4. The acceleration a is integrated twice in the integration calculation unit 55c. As a result, the acceleration a is converted into the displacement X of the lens frame 4. That is, the driving unit 55 calculates the displacement X of the lens frame 4 from the driving force F1 by calculation. Then, the displacement X is converted to an urging force F2 acting on the lens frame 4 by multiplying the displacement X by the spring constant K of the urging means. By subtracting this biasing force F2 from the driving force F1 and feeding back, the resultant force is converted into a resultant force acting on the lens frame 4. As described above, in the conventional drive unit, the electromagnetic force is adjusted by feedback control. In FIG. 11C, the above-described spring constant is a negative value, and changes depending on the position of the lens frame 4, and therefore is expressed as a function of the displacement X.

  Next, with respect to the urging force between the drive unit using the urging unit that is a linear system such as a spring and the drive unit using the non-linear urging unit such as a magnetic attractive force like the imaging device 100, This will be described with reference to FIG. The graph line 22 shows the relationship between the urging force applied to the drive unit using the urging means that is a line system such as a spring and the position, and the graph line 23 shows non-linear urging means such as a magnetic attractive force. The relationship between the urging | biasing force concerning the used drive part and a position is shown. The inclination of the graph line 22, that is, the spring constant, is constant regardless of the position of the moving member. Thereby, the biasing force applied to the moving member increases in proportion to the position of the moving member. On the other hand, the slope of the graph line 23, that is, the spring constant, varies depending on the position of the moving member. Furthermore, since the value of the spring constant is negative, the balance point between the driving force and the urging force becomes unstable.

Based on the above description, the frequency characteristics of the drive unit will be described with reference to FIGS. 11B and 11D. Expression 28 is an expression of a graph line indicating the frequency characteristics of the drive unit, and Expressions 29a to 29d and 30 are expressions of a graph line connecting break points in the graph line 28. In FIG. 11B, in Equation 28, when the value of K is equal to the value of mS ² , the denominator becomes zero and diverges. This is the so-called resonance point. On the other hand, in FIG. 11 (d), the value of K (x) varies depending on the position of the lens frame 4. This is shown in FIGS. 11 (b) and 11 (d). Here, the spring constant is represented by -K (x), and its value is always negative. Therefore, the denominator of Equation 28 does not become zero, there is no resonance point, and the characteristics as shown in FIG.

  However, even if there is no resonance point in the drive unit itself, a resonance point is always generated when feedback is performed in the control circuit. Therefore, as shown in FIG. 9, filter processing such as compensator 54a and integrator 54b is required. In a drive unit using a biasing means such as a spring or the like, in order to prevent a resonance frequency from existing in the control band of the drive unit, the drive unit has a frequency between the frequency ωc2 and the frequency ωc3 in the compensator 54a. The values of the frequency ωc2 and the frequency ωc3 are set so that the resonance point exists. On the other hand, in a drive unit using non-linear biasing means such as a magnetic attractive force, the resonance point changes depending on the position of the lens frame 4, so that the entire changing band is filtered or the lens frame 4 It is necessary to perform filter processing by changing the values of the frequency ωc2 and the frequency ωc3 of the filter according to the position of the filter. In other words, since there is no resonance point, filtering can be freely performed in an arbitrary band. By realizing these, positioning control can be performed even in a drive unit using non-linear biasing means such as a magnetic attractive force. The control method described above can be similarly applied to the second to seventh embodiments.

As described above, since the drive control unit 50 performs the feedback control and the filter processing corresponding to the non-linear magnetic biasing force, the positioning control of the lens frame 4 can be accurately performed. In addition, the accuracy of positioning control can be further improved when only the magnetic attractive force is used, compared to the case where the magnetic attractive force and the repulsive force are used in combination.
In the present embodiment, as shown in FIG. 10, the position detecting permanent magnet 13 is attached to the first yoke 8 and the position detecting sensor 14 is attached to the support portion 6d. The permanent magnet 13 can have the same function as the second permanent magnet 12 of the second embodiment. That is, the position detecting permanent magnet 13 can be used to attract or press the lens frame 4 to the fixing member 6.

  Further, the arrangement and the like of the position detecting permanent magnet 13 and the position detecting sensor 14 are not limited to this, and one of the position detecting permanent magnet 13 and the position detecting sensor 14 is the fixing member 6 and the other is the lens frame 4. If it arrange | positions so that it may mutually oppose, any attachment position may be sufficient. For example, when the position detection permanent magnet 13 and the position detection sensor 14 are provided in the fifth embodiment which is a coil drive system, the position detection sensor 14 is provided in the second yoke 11 and the position detection is provided in the support portion 6d as shown in FIG. The permanent magnet 13 may be fixed. Also in this case, since a magnetic attraction force is generated between the position detecting permanent magnet 13 and the second yoke 11, the position detecting permanent magnet 13 is used to attract or press the lens frame 4 to the fixing member 6. can do.

Furthermore, as shown in FIGS. 14 and 15, the position detecting permanent magnet 13 and the position detecting sensor 14 may be arranged so as to face each other in the optical axis direction. Also in this case, the position detecting permanent magnet 13 can be used to attract or press the lens frame 4 to the fixing member 6.
2. Ninth Embodiment Further, as described above, the magnetic attraction force of the second yoke 11 and the like decreases as the distance increases. Therefore, when the lens frame 4 is on the upper side in the optical axis direction when the power of the imaging apparatus 100 is turned off, it is conceivable that the suction force becomes small and the lens frame 4 is not attracted to the first fixing portion 6b. Therefore, in the imaging device 100 of the present embodiment, the control method when turning off the power is different from the conventional one. Here, a control method as the present embodiment will be described based on the imaging apparatus 100 of the first embodiment described above.

FIG. 16 is a flowchart when the imaging apparatus 100 according to this embodiment is powered off. As shown in FIG. 16, this control method includes a moving step S1 and a stopping step S2. In the moving step S1, when a power-off command is sent to the drive unit 55, the coil 10 is energized by the drive unit 55, and the lens frame 4 is driven downward in the optical axis direction by electromagnetic force.
In the stop step S2, energization of the coil 10 is stopped. In this case, since position detection is not performed, the moving distance of the lens frame 4 is set by, for example, the energization time to the coil 10. The setting of the time may be performed in advance in the driving unit 55 or may be performed by other setting means. When the set time is long, the lens frame 4 moves to the stroke end and comes into contact with the first fixed portion 6b, and is further pressed against the first fixed portion 6b. When the set time is short, the lens frame 4 stops in the vicinity of the first fixed portion 6b disposed at the stroke end. Further, if the position of the lens frame 4 at the time of power-off command is close to the first fixed portion 6b, the lens frame 4 can be brought into contact with the first fixed portion 6b even if the set time is short.

  As described above, the lens frame 4 is brought into contact with the first fixed portion 6b when the power is turned off, or moved to the vicinity of the first fixed portion 6b, so that the space between the first permanent magnet 9 and the second yoke 11 is reached. Therefore, the magnetic attractive force generated between the two members when the power is turned off can be increased. Thereby, in a state where the power of the imaging apparatus 100 is turned off, the relative movement between the fixing member 6 and the lens frame 4 can be more reliably prevented, and the position of the lens frame 4 can be stabilized.

3. Tenth Embodiment Although position detection is not performed in the above-described ninth embodiment, a case where position detection is performed is also conceivable. Here, a control method according to the present embodiment will be described based on the imaging apparatus 100 according to the eighth embodiment described above.
FIG. 17 shows a flowchart when the power is turned off as the tenth embodiment. As shown in FIG. 17, the control method of this embodiment includes a position detection step S11, a determination step S12, a movement step S13, and a stop step S14.

  In the position detection step S <b> 11, when a power-off command is sent to the position detection unit 51, the position detection unit 51 detects the position of the lens frame 4 in the optical axis direction. In the determination step S12, the axial position of the lens frame 4 detected in the position detection step S11 is compared with a preset target position, and the lens frame 4 is positioned closer to the second magnetic body in the optical axis direction than the target position. Determine whether or not. In this case, the target position is, for example, a position where the lens frame 4 is in contact with the first fixing portion 6b or a position near the first fixing portion 6b. Then, the determination result is sent to the drive unit 55.

  In the moving step S13, the lens frame 4 is moved to the second yoke 11 side when the lens frame 4 is positioned on the opposite side of the second yoke 11 from the target position according to the determination result in the determining step S12. Let When the lens frame 4 is at the target position or when it is positioned closer to the second yoke 11 than the target position, the moving step S13 and the stopping step S14 are omitted because it is not necessary to move the lens frame 4. . In the stopping step S14, when the lens frame 4 is moved in the moving step S13, the energization of the coil 10 is stopped when the lens frame 4 reaches the target position.

  As described above, since the distance between the first permanent magnet 9 and the second yoke 11 is reduced by moving the lens frame 4 to the target position when the power is turned off, it occurs between both members when the power is turned off. The magnetic attractive force can be increased. Thereby, in a state where the power of the imaging apparatus 100 is turned off, the relative movement between the fixing member 6 and the lens frame 4 can be more reliably prevented, and the position of the lens frame 4 can be stabilized.

C. Other configurations Eleventh Embodiment As described above, the state in which the lens frame 4 and the first fixing portion 6b of the fixing member 6 are in contact is set as the pan focus position of the lenses 1 to 3, thereby reducing power consumption. Can do. In order to realize this, it is actually necessary to adjust the distance in the optical axis direction between the image sensor and the fixing member 6 during assembly. In the conventional image pickup apparatus, there is almost no need to adjust the distance between the image pickup element and the fixing member at the time of assembly, and thus the structure is not adjustable. Further, as described above, for example, if the distance between the second yoke 11 and the first permanent magnet 9 can be easily adjusted, the setting of the magnetic attractive force generated between the two members can be adjusted.

Therefore, the case where the adjusting mechanism 60 is provided in the imaging device 100 of the first to eighth embodiments described above is also conceivable. FIG. 18 is a schematic cross-sectional view of an imaging apparatus 100 as the eleventh embodiment of the present invention.
As illustrated in FIG. 18, the imaging apparatus 100 further includes an imaging element 15 and an adjustment mechanism 60. The imaging element 15 is disposed on the optical path of the imaging optical system so as to face the lens 3. The adjustment mechanism 60 includes a first adjustment member 61, a second adjustment member 62, a first adjustment screw 64, and a first coil spring 66. The first adjustment member 61 is a plate-like member provided on the fixing member 6. Specifically, the first adjustment member 61 is a plate-like member that protrudes outward from the outer peripheral portion of the first fixing portion 6b in a direction perpendicular to the axial direction, and is fixed to the outer peripheral portion of the first fixing portion 6b. Has been. The second adjustment member 62 is fixed to the image sensor 15 and is disposed to face the first adjustment member 61 in the optical axis direction. The first adjustment screw 64 is provided on the first adjustment member 61 so as not to move in the optical axis direction and to be rotatable, and is screwed with the second adjustment member 62 in the optical axis direction. Specifically, the first adjustment screw 64 has a head portion 64a and a shaft portion 64b. The head portion 64a is formed at one end of the shaft portion 64b and has an outer diameter larger than that of the shaft portion 64b. The head 64 a is in contact with the first adjustment member 61. The shaft portion 64 b is threaded only at a portion screwed with the second adjustment member 62, and is not threaded at a portion penetrating the first adjustment member 61. The first coil spring 66 is disposed between the first and second adjustment members 61 and 62 so as to be elastically deformable in the optical axis direction. The first adjustment screw 64 is inserted into the first coil spring 66 while being compressed between the first and second adjustment members 61 and 62.

  FIG. 19A is a front view of the adjusting mechanism 60, and FIG. 19B is a cross-sectional view. The relative movement in the axial direction of the second adjustment member 62 and the first adjustment screw 64 is restricted by the threaded portion. Further, since the second adjustment member 62 is biased to the right side in the drawing by the first coil spring 66, the first adjustment member 61 and the head portion 64a of the first adjustment screw 64 are in contact with each other in the axial direction. The relative movement in the axial direction is restricted. When the first adjustment screw 64 is rotated in the direction of the white arrow in this state, the second adjustment member 62 is moved relative to the first adjustment member 61 in the direction of the black arrow by the screwed portion. As a result, the axial distance between the first adjustment member 61 and the second adjustment member 62 can be easily adjusted. That is, the distance between the fixing member 6 and the image sensor 15 can be easily adjusted. Thereby, at the time of an assembly | attachment, the pan focus position of the lenses 1-3 can be adjusted easily.

Based on the same principle, the distance between the fixing member 6 and the second yoke 11 can be adjusted. In other words, the distance between the first permanent magnet 9 and the second yoke 11 in a state where the lens frame 4 is in contact with the fixing member 6 can be adjusted. Thereby, it becomes possible to adjust the urging force in a state where the lens frame 4 and the fixing member 6 are in contact with each other, and an optimal urging force can be generated.
Further, the distance between the second yoke 11 and the image sensor 15 can be adjusted by the same principle. That is, only the urging force is adjusted when the positional relationship between the fixing member 6 and the image sensor 15 is the pan focus position at the contact position between the lens frame 4 and the first fixing portion 6b. It becomes possible to do.

As described above, the adjustment mechanism 60 can easily adjust the pan focus position and the magnitude of the magnetic urging force by the second yoke 11, reducing tact time when mass-producing the imaging device 100, and the like. It becomes possible to improve the yield.
In addition, in this embodiment, although the 1st adjustment member 61 is provided in the fixing member 6, it is not limited to this, You may replace the 1st adjustment member 61 and the 2nd adjustment member 62 with each other. In the present embodiment, the adjustment mechanism 60 as shown in FIG. 18 is attached to the imaging apparatus 100. However, the present invention is not limited to this, and other adjustment mechanisms 60 may be used.

In the present embodiment, the distance between the fixing member 6 and the second yoke 11, the distance between the fixing member 6 and the imaging element 15, and the distance between the second yoke 11 and the imaging element 15 can be adjusted. However, it is not limited to this, You may provide the adjustment mechanism 60 similar to the above also between other members.
Further, in the present embodiment, the adjustment mechanism 60 is provided only in one place in FIG. 18, but the present invention is not limited to this, and a plurality of adjustment mechanisms 60 are provided in order to adjust the distance between two members. Also good.

In the present embodiment, the magnitude of the urging force is adjusted by adjusting the distance between the fixing member 6 and the second yoke 11, but the present invention is not limited to this, and the thickness and shape of the second yoke 11 are changed. Alternatively, it may be adjusted by changing the size, shape and material of the first permanent magnet 9.
2. Twelfth Embodiment In the above-described embodiment, the guide means for the lens frame 4 is described as the guide poles 7a and 7b, but other guide means are also conceivable. FIG. 20 is a schematic sectional view of an imaging apparatus 100 as the twelfth embodiment of the present invention.

  As shown in FIG. 20, the fixing member 6 of this embodiment has a guide wall 6e as guide means. Specifically, the guide wall 6e is a cylindrical portion extending in the optical axis direction from the outer peripheral side of the first fixed portion 6b, and the first yoke 8 is inserted into the inner peripheral side. As a result, the lens frame 4 can be accurately guided to the fixing member 6 without providing a guide pole. Thereby, the number of parts can be reduced and the manufacturing cost can be reduced.

In the present embodiment, the guide frame 6 e is provided on the fixing member 6 and the lens frame 4 is guided by sliding with the first yoke 8. However, the present invention is not limited to this, and a lens frame other than the first yoke 8 is provided. 4 or any member fixed to the lens frame 4 may be slid. Moreover, although the guide wall 6e is provided in the 1st fixing | fixed part 6b, you may provide in the 2nd fixing | fixed part 6c.
D. Other Embodiments 1. Position Detection Sensor In the above-described embodiment, the position detection sensor 14 is a hall sensor and the position detection permanent magnet 13 is a single permanent magnet. However, the present invention is not limited to this, and an MR sensor, a magnet with a pattern magnetized, or the like is used. It may be used, or position detection may be performed using other position detection means.

2. Filter Processing Unit In the above-described embodiment, the filter processing unit 54 is described as including the compensator 54a and the integrator 54b. However, the present invention is not limited to this, and various other filter processes may be performed.
3. Second Yoke In the above-described embodiment, the urging force is generated by disposing the second yoke 11 on the fixing member 6. However, the present invention is not limited to this, and a permanent magnet (fourth permanent) is used instead of the second yoke 11. A magnet) may be provided. In this case, the same effect as the case where the second yoke 11 is provided can be obtained by appropriately magnetizing the fourth permanent magnet. The arrangement and the like of the fourth permanent magnet are the same as those of the second yoke 11 in each drawing.

4). Second and Third Permanent Magnets In the above-described embodiment, the second permanent magnets 12 and 20 and the third permanent magnet 21 are described as being annular. However, the present invention is not limited to this, and any shape such as a rectangular parallelepiped, for example. It may be. Moreover, you may be comprised from the some permanent magnet.
5. Voice Coil Motor The above-described embodiment does not limit the configuration of the voice coil motor 16. For example, although the 1st permanent magnet 9 is made into one magnet, it is not limited to this, A some permanent magnet may be sufficient.

  With the drive device according to the present invention, it is possible to stabilize the position of the moving member even when the power is turned off, and to shorten the dimension in the optical axis direction. In addition, since power consumption can be reduced, it can be industrially used as a driving device for an imaging optical system.

1 is a schematic cross-sectional view of an imaging apparatus 100 as a first embodiment of the present invention. The cross-sectional schematic of the imaging device 100 as 2nd Embodiment of this invention. The cross-sectional schematic of the imaging device 100 as 3rd Embodiment of this invention. Sectional schematic of the imaging device 100 as 4th Embodiment of this invention. Sectional schematic of the imaging device 100 as 5th Embodiment of this invention. Sectional schematic of the imaging device 100 as 6th Embodiment of this invention. Sectional schematic of the imaging device 100 as 7th Embodiment of this invention. FIG. 6 is a diagram illustrating the relationship between the position of the imaging element and the lens and the focusing distance. The control block diagram of the imaging device 100 as 8th Embodiment of this invention. Sectional schematic of the imaging device 100 as 8th Embodiment of this invention. Block diagram and comparison chart of frequency characteristics. The comparison figure of urging force characteristic. The modification of 8th Embodiment of this invention. The modification of 8th Embodiment of this invention. The modification of 8th Embodiment of this invention. The flowchart at the time of power-off of the imaging device 100 as 9th Embodiment of this invention. The flowchart at the time of power-off of the imaging device 100 as 10th Embodiment of this invention. The cross-sectional schematic of the imaging device 100 as 11th Embodiment of this invention. The front view and sectional drawing of the adjustment mechanism 60. FIG. The cross-sectional schematic of the imaging device 100 as 12th Embodiment of this invention. FIG. 6 is a schematic cross-sectional view of a conventional imaging device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Imaging device 1-3 Lens 4 Lens frame (moving member)
6 fixing member 6a cylindrical portion 6b first fixing portion 6c second fixing portion 7a guide pole 7b guide pole 8 first yoke (first magnetic body)
9 First permanent magnet 10 Coil 11 Second yoke (second magnetic body)
12, 20 Second permanent magnet 13 Position detection permanent magnet 14 Position detection sensor 15 Image sensor 16 Voice coil motor 21 Third permanent magnet 50 Drive controller 60 Adjustment mechanism 61 First adjustment member 62 Second adjustment member 64 First adjustment Screw 66 First coil spring (first biasing member)
S11 Position detection process S12 Judgment process S1, S13 Movement process S2, S14 Stop process

Claims (31)

A fixing member;
A movable member fixed to the driven member, movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction;
A first permanent magnet provided on the moving member;
A first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction;
A coil provided on the fixing member and disposed between a direction perpendicular to an axial direction of the first permanent magnet and the first magnetic body;
At least one second magnetic body provided on the fixing member and disposed on one axial side with respect to at least one of the first permanent magnet and the first magnetic body;
A drive device comprising: Further comprising at least one second permanent magnet provided on the second magnetic body side in the axial direction of the moving member;
The drive device according to claim 1. Provided with at least one third permanent magnet provided on the fixed member and disposed on the opposite side of the second magnetic body with respect to the moving member;
The drive device according to claim 1 or 2. A fixing member;
A movable member fixed to the driven member, movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction;
A first permanent magnet provided on the fixing member;
A first magnetic body provided on the fixing member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction;
A coil provided on the moving member and disposed between a direction perpendicular to an axial direction of the first permanent magnet and the first magnetic body;
At least one second magnetic body provided on the fixing member and disposed on one axial side of at least one of the first permanent magnet and the first magnetic body;
At least one second permanent magnet provided on the second magnetic body side in the axial direction of the moving member;
A drive device comprising: Provided with at least one third permanent magnet provided on the fixed member and disposed on the opposite side of the second magnetic body with respect to the moving member;
The drive device according to claim 4. The second magnetic body has substantially the same position in a direction perpendicular to the axial direction as at least one of the first permanent magnet and the first magnetic body.
The drive device according to any one of claims 1 to 5. The second magnetic body has substantially the same position in the direction perpendicular to the axial direction of the coil,
The drive device according to any one of claims 1 to 6. The fixing member has a first fixing portion that can contact the moving member in the axial direction;
The second magnetic body is disposed on the opposite side of the moving member of the first fixed portion in the axial direction.
The drive device according to any one of claims 1 to 7. The position detection permanent magnet provided on the second magnetic body side in the axial direction of the moving member and the position detection provided on the fixed member so as to face the position detection permanent magnet in a direction perpendicular to the axial direction. A position detection sensor for detecting an axial position of the moving member via a permanent magnet for operation;
The drive device according to any one of claims 1 to 8. A fixing member;
A movable member fixed to the driven member, movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction;
A first permanent magnet provided on the moving member;
A first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction;
A coil provided on the fixing member and disposed between a direction perpendicular to an axial direction of the first permanent magnet and the first magnetic body;
At least one fourth permanent magnet provided on the fixing member and disposed on one axial side of at least one of the first permanent magnet and the first magnetic body;
A drive device comprising: Further comprising at least one second permanent magnet provided on the fourth permanent magnet side in the axial direction of the moving member;
The drive device according to claim 10. Provided with at least one third permanent magnet provided on the fixed member and disposed on the opposite side of the moving member with respect to the fourth permanent magnet;
The drive device according to claim 10 or 11. A fixing member;
A movable member fixed to the driven member, movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction;
A first permanent magnet provided on the fixing member;
A first magnetic body provided on the fixing member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction;
A coil provided on the moving member and disposed between a direction perpendicular to an axial direction of the first permanent magnet and the first magnetic body;
At least one fourth permanent magnet provided on the fixing member and disposed on one axial side of at least one of the first permanent magnet and the first magnetic body;
At least one second permanent magnet provided on the fourth permanent magnet side in the axial direction of the moving member;
A drive device comprising: Provided with at least one third permanent magnet provided on the fixed member and disposed on the opposite side of the moving member with respect to the fourth permanent magnet;
The drive device according to claim 13. The fourth permanent magnet has substantially the same position in a direction perpendicular to the axial direction as at least one of the first permanent magnet and the first magnetic body.
The drive device according to any one of claims 10 to 14. The fourth permanent magnet has substantially the same position in the direction perpendicular to the axial direction of the coil.
The drive device according to any one of claims 10 to 15. The fixing member has a first fixing portion that can contact the moving member in the axial direction;
The fourth permanent magnet is disposed on the axially opposite side of the moving member of the first fixed portion.
The drive device according to any one of claims 10 to 16. The position detecting permanent magnet provided on the fourth permanent magnet side in the axial direction of the moving member, and the position provided on the fixed member facing the position detecting permanent magnet in a direction perpendicular to the axial direction. A position detection sensor for detecting an axial position of the moving member via a permanent magnet for detection;
The drive device according to any one of claims 10 to 17. A fixing member;
A movable member fixed to the driven member, movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction;
A first permanent magnet provided on the moving member;
A first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to an axial direction;
A coil provided on the fixing member and disposed between a direction perpendicular to an axial direction of the first permanent magnet and the first magnetic body;
At least one third permanent magnet provided in the fixing member and disposed to face at least one of the first permanent magnet and the first magnetic body in the axial direction;
A drive device comprising: A fixing member;
A movable member fixed to the driven member, movable in the axial direction with respect to the fixed member, and capable of contacting in the axial direction;
A first permanent magnet provided on the fixing member;
A first magnetic body provided on the fixing member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction;
A coil provided on the moving member and disposed between a direction perpendicular to an axial direction of the first permanent magnet and the first magnetic body;
At least one second permanent magnet provided on the moving member;
At least one third permanent magnet provided on the fixing member;
A drive device comprising: The position detecting permanent magnet provided on the moving member, and the position detecting permanent magnet provided on the fixed member and arranged opposite to the position detecting permanent magnet in a direction perpendicular to the axial direction, the movement via the position detecting permanent magnet. A position detection sensor for detecting the axial position of the member;
The drive device according to claim 19 or 20. The fixing member is disposed on an outer peripheral side of the first magnetic body, and is in a cylindrical shape that contacts at least one of the moving member, the first permanent magnet, and the first magnetic body in a direction perpendicular to the axial direction. Has a guide wall,
The drive device according to any one of claims 1 to 21. At least one lens constituting at least part of the imaging optical system;
An image sensor disposed on the optical path of the imaging optical system;
The driving device according to claim 1, for driving the lens in an optical axis direction with respect to the imaging element;
An imaging apparatus comprising: In the imaging optical system, the lens is disposed so as to be in a pan focus position in a state where the moving member is in contact with the fixed member in the axial direction.
The imaging device according to claim 23. A first adjusting member provided on the fixing member; a second adjusting member provided on the second magnetic body and disposed opposite to the first adjusting member in an optical axis direction; and the first and second adjusting members. One of the members is provided so as to be immovable and rotatable in the optical axis direction, and is screwed in the optical axis direction with the other, and between the first and second adjusting members in the optical axis direction. And an adjustment mechanism having a first biasing member arranged to be elastically deformable,
The imaging device according to claim 24. The first biasing member is an elastic member,
The first adjustment screw is inserted into the first biasing member,
The imaging device according to claim 25. The adjusting mechanism is provided in the image pickup device, and is disposed on the first adjusting member so as to face the first adjusting member in the optical axis direction, and on either one of the first and third adjusting members in the optical axis direction. A second adjustment screw that is immovable and rotatable, and is screwed with the other in the optical axis direction, and is disposed between the first and third adjustment members so as to be elastically deformable in the optical axis direction. A force member,
The imaging device according to claim 25 or 26. A first adjustment member provided on the fixing member, a third adjustment member provided on the imaging element and disposed opposite to the first adjustment member in the optical axis direction, and the first and third adjustment members. Either one of the second adjustment screw that is immovable and rotatable in the optical axis direction and screwed in the other to the optical axis direction, and elastically deformed in the optical axis direction between the first and third adjustment members An adjustment mechanism having a second biasing member arranged in a possible manner;
The imaging device according to claim 24. The second urging member is an elastic member,
The second adjustment screw is inserted into the second urging member,
The imaging device according to claim 27 or 28. A fixed member, a movable member fixed to a driven member and movable in the axial direction with respect to the fixed member and capable of contacting in the axial direction; a first permanent magnet provided in the movable member; A first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction, and an axial direction of the first permanent magnet and the first magnetic body provided on the fixed member And at least one second magnetic body provided on the fixing member and disposed on one axial side of at least one of the first permanent magnet and the first magnetic body. A method of controlling a drive device comprising:
The driving device further includes a control unit including a driving unit that drives the moving member,
A moving step of moving the moving member to a stroke end on the second magnetic body side in the axial direction or the vicinity thereof before stopping energization of the coil;
A stop step of stopping energization of the coil after moving the moving member to the stroke end or the vicinity thereof;
A method for controlling a drive device including: A fixed member, a movable member fixed to the driven member and movable in the axial direction with respect to the fixed member, and capable of abutting in the axial direction, and a first permanent magnet provided in the movable member A first magnetic body provided on the moving member and disposed opposite to the first permanent magnet in a direction perpendicular to the axial direction; and the first permanent magnet and the first magnetic body provided on the fixed member. A coil disposed between a direction perpendicular to the axial direction and at least one second disposed on the one axial side of at least one of the first permanent magnet and the first magnetic body provided on the fixing member; A method for controlling a drive device comprising a magnetic body,
The driving device further includes a control unit including a driving unit that drives the moving member,
A position detecting step for detecting an axial position of the moving member before stopping energization of the coil;
The axial position of the moving member detected in the position detecting step is compared with a preset target position, and it is determined whether the moving member is positioned closer to the second magnetic body in the axial direction than the target position. A decision process to
According to the determination result in the determination step, when the axial position of the moving member is located on the opposite side of the second magnetic body from the target position, the moving member is axially moved to the target position. A moving step of moving to the second magnetic body side;
A stop step of stopping energization of the coil after moving the moving member to the target position;
A method for controlling a drive device including:

Images