Optical element drive device
An optical element drive device includes a movable section and a fixed section. The movable section includes a first magnetic field generator for generating a first magnetic field and is drivable in a motion direction. The fixed section includes a sensor unit. The sensor unit carries out a detection based on the first magnetic field and a bias magnetic field different from the first magnetic field.
1. An optical element drive device comprising:
a movable section including a first magnetic field generator for generating a first magnetic field and being drivable in a motion direction; and
a fixed section including a sensor unit,
wherein the sensor unit carries out a detection based on the first magnetic field and a bias magnetic field different from the first magnetic field.
2. The optical element drive device according to claim 1 , wherein the sensor unit detects a combined magnetic field of the first magnetic field and the bias magnetic field.
3. The optical element drive device according to claim 2 , wherein
the fixed section includes a bias magnetic field generator for generating the bias magnetic field, and
the bias magnetic field generator is disposed around a sensor included in the sensor unit.
4. The optical element drive device according to claim 2 , wherein
the fixed section includes a second magnetic field generator for generating a second magnetic field, and
the second magnetic field is applied to the sensor unit as the bias magnetic field.
5. The optical element drive device according to claim 4 , wherein the sensor unit carries out a detection based on the first magnetic field and the second magnetic field.
6. The optical element drive device according to claim 2 , wherein the sensor unit includes a sensor capable of detecting an angle corresponding to a movement displacement of the first magnetic field generator.
7. The optical element drive device according to claim 1 , wherein
the fixed section includes a bias magnetic field generator for generating the bias magnetic field, and
the bias magnetic field generator is disposed around a sensor included in the sensor unit.
8. The optical element drive device according to claim 7 , wherein
the fixed section includes a second magnetic field generator for generating a second magnetic field, and
the second magnetic field is applied to the sensor unit as the bias magnetic field.
9. The optical element drive device according to claim 7 , wherein the sensor unit includes the sensor capable of detecting an angle corresponding to a movement displacement of the first magnetic field generator.
10. The optical element drive device according to claim 1 , wherein
the fixed section includes a second magnetic field generator for generating a second magnetic field, and
the second magnetic field is applied to the sensor unit as the bias magnetic field.
11. The optical element drive device according to claim 10 , wherein the sensor unit carries out a detection based on the first magnetic field and the second magnetic field.
12. The optical element drive device according to claim 11 , wherein the sensor unit detects a combined magnetic field of the first magnetic field and the second magnetic field.
13. The optical element drive device according to claim 11 , wherein the movable section includes a coil to be drivable by interaction of a magnetic field generated by the coil and the second magnetic field.
14. The optical element drive device according to claim 10 , wherein the sensor unit detects a combined magnetic field of the first magnetic field and the second magnetic field.
15. The optical element drive device according to claim 14 , wherein the movable section includes a coil to be drivable by interaction of a magnetic field generated by the coil and the second magnetic field.
16. The optical element drive device according to claim 10 , wherein the movable section includes a coil to be drivable by interaction of a magnetic field generated by the coil and the second magnetic field.
17. The optical element drive device according to claim 16 , wherein the sensor unit is disposed closer to a center of the fixed section than to the coil when viewed from the motion direction of the movable section.
18. The optical element drive device according to claim 10 , wherein
the second magnetic field generator comprises a plurality of second magnetic field generators, and
the sensor unit is disposed within a region defined by the second magnetic field generators.
19. The optical element drive device according to claim 1 , wherein the sensor unit includes a sensor capable of detecting an angle corresponding to a movement displacement of the first magnetic field generator.
20. The optical element drive device according to claim 1 , wherein the movable section includes a balance member disposed on the other side of the first magnetic field generator across an optical element.
21. The optical element drive device according to claim 1 , wherein
stoppers for regulating a movement of the movable section in the motion direction are arranged away from each other in the fixed section, and
the sensor unit is disposed within a region sandwiched by ends of the stoppers next to each other when viewed from the motion direction of the movable section.
22. The optical element drive device according to claim 1 , wherein the sensor unit is disposed so as not to overlap with a back spring for supporting the movable section from behind when viewed from the motion direction of the movable section.
23. The optical element drive device according to claim 1 , wherein the sensor unit is disposed so that a front end of the sensor unit is located forward from a front end of a stopper for regulating a movement of the movable section in the motion direction and is located backward from a back end of a back spring for supporting the movable section from behind.
24. The optical element drive device according to claim 1 , wherein the sensor unit faces the first magnetic field generator via a fixation member for fixing the sensor unit to the fixed section.
25. The optical element drive device according to claim 1 , wherein
the fixed section includes a yoke disposed to surround the movable section,
the yoke is provided with a pair of protrusion pieces protruding toward an inner side of the yoke, and
either of the protrusion pieces is located at an end of the yoke located on one side of the sensor unit, and the other protrusion piece is located at an end of the yoke located on the other side of the sensor unit, when viewed from a direction perpendicular to the motion direction of the movable section.
26. The optical element drive device according to claim 1 , wherein the first magnetic field generator is embedded into the movable section.
27. An electronic equipment comprising the optical element drive device according to claim 1 .