Photographic optical device
An imaging optical device may include a movable module having a lens drive device on which a lens and an imaging element are mounted; a support body for supporting the movable module; a rocking drive mechanism for rocking the movable module; and a plate spring for rockably supporting the movable module. The plate spring is provided with a holding section for holding the movable module, a fixed section fixed to the support body, and a spring section for connecting the holding section and the fixed section to each other. The spring section can deform in the direction perpendicular to the optical axis and in the direction of the optical axis.
1. A photographic optical device comprising:
a lens drive device on which a lens, an imaging element, and a lens drive mechanism for driving the lens are mounted;
a movable module which is provided with the lens drive device;
a support body which supports the movable module; and
a shake correction mechanism which swings the movable module so that an optical axis of the lens drive device is inclined with respect to the support body to correct a shake;
wherein the shake correction mechanism comprises:
a swing drive mechanism for swinging the movable module; and
a spring member which swingably supports the movable module; and
wherein the spring member comprises:
a holding part which holds the movable module;
a fixing part which is fixed to the support body; and
a spring part which connects the holding part with the fixing part and is capable of performing a swing operation of the movable module, the spring part being deformable in a direction perpendicular to the optical axis and an optical axis direction;
the spring member is formed in a substantially rectangular shape as a whole and an outer peripheral end of the spring member is disposed to be substantially parallel to the first direction or the second direction,
the fixing part is disposed at a substantially center of the first direction of the spring member and a substantially center of the second direction,
the holding part is formed so that an external shape of the holding part is a substantially rectangular shape, and
the spring member is provide with the spring part which is formed from the substantially center of the holding part in the first direction toward the fixing part that is disposed at the substantially center of the second direction, and the spring part which is formed from the substantially center of the holding part in the second direction toward the fixing part that is disposed at the substantially center of the first direction.
2. The photographic optical device according to claim 1 , wherein
the swing drive mechanism is provided with a plurality of drive magnets and a plurality of drive coils for swinging the movable module with a first direction and a second direction, which are substantially perpendicular to the optical axis and substantially perpendicular to each other, as axial directions, and
the spring part is provided with a first spring part which is substantially parallel to the first direction and a second spring part which is substantially parallel to the second direction.
3. The photographic optical device according to claim 2 , wherein
the movable module is formed in a substantially rectangular shape when viewed in the optical axis direction and whose outer peripheral face is disposed to be substantially parallel to the first direction or the second direction, and
the spring member is formed in a substantially rectangular shape as a whole when viewed in the optical axis direction and an outer peripheral end of the spring member is disposed to be substantially parallel to the first direction or the second direction.
4. The photographic optical device according to claim 3 , wherein the first spring part and the second spring part are disposed between the outer peripheral face of the movable module and the outer peripheral end of the spring member.
5. The photographic optical device according to claim 4 , wherein
the lens drive device is covered by a cover member which is formed of magnetic material and formed in a substantially rectangular tube shape, and an outer side face of the cover member is fixed with the drive magnet structuring the swing drive mechanism, and
the support body is provided with a case body which is formed in a substantially rectangular tube shape and covers the cover member, and the drive coil is fixed to an inner side face of the case body.
6. The photographic optical device according to claim 2 , wherein the shake correction mechanism is provided with a supporting point part which is a supporting point when the movable module is swung, and the movable module is swing with the supporting point part as a center.
7. The photographic optical device according to claim 6 , wherein the spring part is formed in a substantially “L”-shape which is structured of the first spring part and the second spring part.
8. The photographic optical device according to claim 7 , wherein
the movable module is formed in a substantially rectangular shape when viewed in the optical axis direction,
the spring member is formed in a substantially rectangular shape as a whole,
the fixing part is disposed at four corners of the spring member,
the holding part is disposed at four corners or vicinities of the four corners of the movable module when viewed in the optical axis direction,
the spring part is formed to connect the holding part with the fixing part which are disposed on a substantially diagonal line of the spring member, and
the first spring part of one spring part and the first spring part of another spring part are superposed on each other in the second direction, and the second spring part of one spring part and the second spring part of another spring part are superposed on each other in the first direction.
9. The photographic optical device according to claim 8 , wherein the spring member is structured of four spring pieces in a substantially “L”-shape each of which is provided with the one holding part, the one fixing part, and the one spring part.
10. The photographic optical device according to claim 7 , wherein
the movable module is formed in a substantially rectangular shape when viewed in the optical axis direction and whose outer peripheral face is disposed to be substantially parallel to the first direction or the second direction,
the spring member is formed in a substantially rectangular shape as a whole and an outer peripheral end of the spring member is disposed to be substantially parallel to the first direction or the second direction,
the fixing part is disposed at a substantially center of the first direction of the spring member and a substantially center of the second direction,
the holding part is disposed at four corners or vicinities of the four corners of the movable module when viewed in the optical axis direction, and
the spring member is provided with the spring part having a first turn-around spring part which is formed to be turned around in the first direction as the first spring part, and the spring part having a second turn-around spring part which is formed to be turned around in the second direction as the second spring part.
11. The photographic optical device according to claim 10 , wherein the spring member is structured of two spring pieces each of which is provided with the two holding parts, the two fixing parts, the one spring part having the first turn-around spring part, and the one spring part having the second turn-around spring part.
12. The photographic optical device according to claim 6 , wherein
the spring member is provided with a plurality of the spring parts, and
the first spring part of one spring part and the first spring part of another spring part are superposed on each other in the second direction, and the second spring part of one spring part and the second spring part of another spring part are superposed on each other in the first direction.
13. The photographic optical device according to claim 6 , wherein the spring member is fixed to the support body in a resiliently bent state so as to generate pressurization for abutting the movable module with the supporting point part.
14. The photographic optical device according to claim 13 , wherein
the support body is provided with a base body which is fixed to a lower end side of the case body to structure the support body together with the case body,
the movable module is provided with a sensor for detecting a variation of inclination of the lens drive device, and the sensor is disposed in an inside of a sensor cover member which is fixed to a lower end of the cover member, and
a supporting point part which is a supporting point for swing of the lens drive device is provided between a bottom part of the sensor cover member and the base body.
15. The photographic optical device according to claim 1 , wherein
a holding part side end of the spring part which is formed from the substantially center of the holding part in the first direction toward the fixing part that is disposed at the substantially center of the second direction and a fixing part side end of the spring part which is formed from the substantially center of the holding part in the second direction toward the fixing part that is disposed at the substantially center of the first direction are adjacent to each other in the first direction, and
a holding part side end of the spring part which is formed from the substantially center of the holding part in the second direction toward the fixing part that is disposed at the substantially center of the first direction and a fixing part side end of the spring part which is formed from the substantially center of the holding part in the first direction toward the fixing part that is disposed at the substantially center of the second direction are adjacent to each other in the second direction.
16. The photographic optical device according to claim 1 , wherein the spring member is disposed in a vicinity of a swing center of the movable module in the optical axis direction.
17. The photographic optical device according to claim 16 , wherein a spring constant of the spring part in the optical axis direction is not more than a spring constant of the spring part in a direction perpendicular to the optical axis.
18. The photographic optical device according to claim 1 , wherein the spring member is disposed on a swing center side of the movable module with respect to the swing drive mechanism in the optical axis direction.
19. The photographic optical device according to claim 18 , wherein a spring constant of the spring part in the optical axis direction is not more than a spring constant of the spring part in a direction perpendicular to the optical axis.
20. The photographic optical device according to claim 1 , wherein the movable module is provided with a sensor for detecting a variation of inclination of the lens drive device.