Camera assembly
A camera assembly comprises a lens assembly supported on a support structure, wherein the lens assembly includes an autofocus actuator arrangement and the camera assembly includes an optical image stabilization assembly arranged to move the lens assembly in a plane perpendicular to the optical axis. A flexible printed circuit tape connected between the support structure and the lens assembly and providing an electrical connection to the auto-focus actuator arrangement is bent around a corner, thereby allowing the flexible printed circuit tape to accommodate the motion of the lens assembly perpendicular to the optical axis. A crimp plate connected to the lens assembly which crimps shape memory alloy wires has features extending out of the plane of the crimp plate for reducing flexibility. At least part of the optical image stabilization assembly overlaps the lens assembly in the direction along the optical axis, thereby reducing the height of the camera assembly.
1. A camera assembly comprising:
a support structure;
a lens assembly comprising a lens carriage, a lens holder with at least one lens having an optical axis and supported on the lens carriage in a manner allowing movement of the lens holder along the optical axis and an autofocus actuator arrangement arranged to move the lens holder relative to the lens carriage along the optical axis, wherein the lens carriage is supported on the support structure in a manner allowing movement of the lens carriage relative to the support structure in a plane perpendicular to the optical axis; and
an optical image stabilisation assembly comprising shape memory alloy wires arranged to move the lens carriage relative to the support structure in said plane perpendicular to the optical axis,
wherein part of the optical image stabilisation assembly overlaps the lens carriage and the lens holder in a direction along the optical axis.
2. The camera assembly according to claim 1 , wherein the part of the optical image stabilisation assembly that overlaps the lens carriage and the lens holder includes the shape memory alloy wires.
3. The camera assembly according to claim 1 , wherein the optical image stabilisation assembly comprises balls arranged to perform a bearing function between the support structure and the lens carriage, and the part of the optical image stabilisation assembly that overlaps the lens carriage and the lens holder includes the balls.
4. The camera assembly according to claim 1 , wherein the optical image stabilisation assembly comprises a crimp plate connected to the lens assembly, the crimp plate comprising crimp portions that crimp one end of the shape memory alloy wires, the crimp plate extending in a plane and the crimp plate is shaped to position the crimp portions above the plane of the crimp plate in a direction towards the lens assembly.
5. The camera assembly according to claim 1 , wherein the optical image stabilisation assembly comprises a movable platform including a crimp plate comprising crimp portions that crimp one end of the shape memory alloy wires and a cradle, the cradle having step offset from the remainder of the cradle in a direction along the optical axis away from the lens assembly to which the lens assembly is connected.
6. The camera assembly according to claim 1 , further comprising an image sensor mounted to the support structure.
7. The camera assembly according to claim 1 , wherein the at least one lens has a diameter of 10 mm or less.
8. The camera assembly according to claim 1 , wherein the optical image stabilisation assembly further comprises a movable platform that is connected to the lens assembly and a support plate that forms part of the support structure, the shape memory alloy wires being connected between the movable platform and the support plate.
9. The camera assembly according to claim 8 , wherein the optical image stabilisation assembly further comprises balls arranged to perform a bearing function between the movable platform and the support plate.
10. The camera assembly according to claim 9 , wherein the optical image stabilisation assembly further comprises a resilient element that biases the movable platform and the support plate against the balls.
11. The camera assembly according to claim 10 , wherein the resilient element is a flexure arm extending between the movable platform and the support plate.
12. The camera assembly according to claim 8 , wherein the movable platform and the support plate each have a laminated construction.
13. The camera assembly according to claim 12 , wherein the movable platform and the support plate each have a laminated construction of insulator layers and metallic layers bonded by adhesive.