JP2008178173A5

JP2008178173A5 -

Info

Publication number: JP2008178173A5
Application number: JP2007007512A
Authority: JP
Filing date: 2007-01-16
Publication date: 2011-04-07
Anticipated expiration: 2027-01-16

Claims

A movable plate,
A support portion for supporting the movable plate;
A connecting portion that connects the movable plate and the support portion so that the movable plate can rotate with respect to the support portion;
Each of the connecting portions includes a pair of longitudinal elastic members provided so as to face each other via the rotation center axis of the movable plate, and the pair of elastic members are bent and deformed in opposite directions to each other. An actuator configured to rotate the movable plate,
A pair of piezoelectric elements provided to correspond to each of the pair of elastic members;
Voltage application means for alternately and periodically applying a voltage to the pair of piezoelectric elements;
An actuator comprising: behavior detecting means for detecting the behavior of the movable plate based on an electromotive force generated by deformation of each piezoelectric element in a state where the voltage is not applied.

The behavior detection means includes an electromotive force detection unit that detects an electromotive force generated by deformation of the piezoelectric element, and an analysis unit that analyzes the behavior of the movable plate based on the electromotive force detected by the electromotive force detection unit. 2. The actuator according to claim 1, further comprising: a switching unit configured to block an input of an electromotive force from the piezoelectric element to the electromotive force detection unit when necessary.

The switching unit is configured to block the input of the electromotive force generated by the deformation of one piezoelectric element of the pair of piezoelectric elements to the electromotive force detection unit and the electromotive force generated by the deformation of the other piezoelectric element. The actuator according to claim 2, wherein the actuator is configured to substantially coincide with a timing at which an input to the electromotive force detection unit is started.

The voltage application unit includes a voltage waveform generation unit that generates a desired voltage waveform, and a driver that applies a voltage corresponding to the voltage waveform generated by the voltage waveform generation unit to each piezoelectric element. The actuator according to any one of 1 to 3.

The driver is configured to apply a voltage between the end of voltage application to one of the pair of piezoelectric elements and the start of voltage application to the other piezoelectric element, and to the other piezoelectric element. 5. The actuator according to claim 4, wherein a voltage is alternately applied to the pair of piezoelectric elements by providing a predetermined time interval between the end of application and the start of voltage application to the one piezoelectric element. .

The actuator according to any one of claims 1 to 5, further comprising a control unit that controls the operation of the voltage application unit based on a detection result of the behavior detection unit.

7. The piezoelectric element according to claim 1, wherein the piezoelectric element is bonded to the elastic members along a longitudinal direction thereof and expands and contracts in the longitudinal direction of the elastic members, thereby bending the elastic members. Actuator.

7. The piezoelectric element according to claim 1, wherein the piezoelectric element is provided so as to contact the elastic members and expands and contracts in the thickness direction of the movable plate to cause the elastic members to bend and deform. Actuator.

The actuator according to any one of claims 1 to 8, wherein the movable plate includes a light reflecting portion having light reflectivity on a plate surface thereof.

  A light reflecting portion comprising a flat portion for reflecting light;
  A first shaft member and a second shaft member that support the light reflecting portion;
  A first drive member connected to the first shaft member;
  A first elastic member and a second elastic member connected to the first driving member;
  A second drive member connected to the second shaft member;
  A third elastic member and a fourth elastic member connected to the second drive member;
  A plurality of piezoelectric elements each provided on each of the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member;
  A plurality of switch elements connected to the plurality of piezoelectric elements one by one;
  A plurality of electromotive force detectors connected to each of the plurality of switch elements and detecting an electromotive force of the corresponding piezoelectric element;
  A control unit that controls the operation of each of the plurality of piezoelectric elements and each of the plurality of switch elements;
  The actuator, wherein a voltage is applied to each of the plurality of piezoelectric elements, whereby the light reflecting portion rotates with respect to the first shaft member and the second shaft member.

  The plurality of piezoelectric elements are provided on a first piezoelectric element provided on the first elastic member, a second piezoelectric element provided on the second elastic member, and a third elastic member. A third piezoelectric element, and a fourth piezoelectric element provided on the fourth elastic member,
  The controller is
  A voltage is applied alternately to the first piezoelectric element and the second piezoelectric element,
  Alternately switching ON / OFF states of the switch element connected to the first piezoelectric element and the switch element connected to the second piezoelectric element;
  A voltage is applied alternately to the third piezoelectric element and the fourth piezoelectric element,
  Alternately switching ON / OFF states of the switch element connected to the third piezoelectric element and the switch element connected to the fourth piezoelectric element;
  The ON state is a state in which an electromotive force generated in the piezoelectric element is input to the electromotive force detection unit,
  The actuator according to claim 10, wherein the OFF state is a state in which an input of an electromotive force generated in the piezoelectric element to the electromotive force detection unit is blocked.

A movable plate including a light reflecting portion having light reflectivity;
A support portion for supporting the movable plate;
A connecting portion that connects the movable plate and the support portion so that the movable plate can rotate with respect to the support portion;
Each of the connecting portions includes a pair of longitudinal elastic members provided so as to face each other via the rotation center axis of the movable plate, and the pair of elastic members are bent and deformed in opposite directions to each other. An optical scanner configured to rotate the movable plate and scan the light reflected by the light reflecting section,
A pair of piezoelectric elements provided to correspond to each of the pair of elastic members;
Voltage application means for alternately and periodically applying a voltage to the pair of piezoelectric elements;
An optical scanner comprising behavior detecting means for detecting the behavior of the movable plate based on an electromotive force generated by deformation of each piezoelectric element in a state where the voltage is not applied.

  A light reflecting portion comprising a flat portion for reflecting light;
  A first shaft member and a second shaft member that support the light reflecting portion;
  A first drive member connected to the first shaft member;
  A first elastic member and a second elastic member connected to the first driving member;
  A second drive member connected to the second shaft member;
  A third elastic member and a fourth elastic member connected to the second drive member;
  A plurality of piezoelectric elements each provided on each of the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member;
  A plurality of switch elements connected to the plurality of piezoelectric elements one by one;
  A plurality of electromotive force detectors connected to each of the plurality of switch elements and detecting an electromotive force of the corresponding piezoelectric element;
  A control unit that controls the operation of each of the plurality of piezoelectric elements and each of the plurality of switch elements;
  When a voltage is applied to each of the plurality of piezoelectric elements, the light reflecting portion rotates with respect to the first shaft member and the second shaft member, and the light incident on the planar portion is reflected. An optical scanner characterized by scanning.

A movable plate including a light reflecting portion having light reflectivity;
A support portion for supporting the movable plate;
A connecting portion that connects the movable plate and the support portion so that the movable plate can rotate with respect to the support portion;
Each of the connecting portions includes a pair of longitudinal elastic members provided so as to face each other via the rotation center axis of the movable plate, and the pair of elastic members are bent and deformed in opposite directions to each other. An image forming apparatus including an optical scanner configured to rotate the movable plate, scan the light reflected by the light reflecting portion, and form an image on an object,
A pair of piezoelectric elements provided to correspond to each of the pair of elastic members;
Voltage application means for alternately and periodically applying a voltage to the pair of piezoelectric elements;
An image forming apparatus comprising: a behavior detecting unit configured to detect a behavior of the movable plate based on an electromotive force generated by deformation of each piezoelectric element in a state where the voltage is not applied.

  A light source;
  An optical scanner that scans the light from the light source,
  The optical scanner is
  A light reflecting portion comprising a planar portion for reflecting the light;
  A first shaft member and a second shaft member that support the light reflecting portion;
  A first drive member connected to the first shaft member;
  A first elastic member and a second elastic member connected to the first driving member;
  A second drive member connected to the second shaft member;
  A third elastic member and a fourth elastic member connected to the second drive member;
  A plurality of piezoelectric elements each provided on each of the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member;
  A plurality of switch elements connected to the plurality of piezoelectric elements one by one;
  A plurality of electromotive force detectors connected to each of the plurality of switch elements and detecting an electromotive force of the corresponding piezoelectric element;
  A control unit that controls the operation of each of the plurality of piezoelectric elements and each of the plurality of switch elements;
  An image forming apparatus, wherein a voltage is applied to each of the plurality of piezoelectric elements to rotate the light reflecting portion with respect to the first shaft member and the second shaft member.