Optical image stabilization with voice coil motor for moving image sensor
In some embodiments, a camera actuator includes an actuator base, an autofocus voice coil motor, and an optical image stabilization voice coil motor. In some embodiments, the autofocus voice coil motor includes a lens carrier mounting attachment moveably mounted to the actuator base, a plurality of shared magnets mounted to the base, and an autofocus coil fixedly mounted to the lens carrier mounting attachment for producing forces for moving a lens carrier in a direction of an optical axis of one or more lenses of the lens carrier. In some embodiments, the optical image stabilization voice coil motor includes an image sensor carrier moveably mounted to the actuator base, and optical image stabilization coils moveably mounted to the image sensor carrier within the magnetic fields of the shared magnets, for producing forces for moving the image sensor carrier in a plurality of directions orthogonal to the optical axis.
1. A voice coil motor (VCM) actuator, comprising:
a dynamic platform configured to couple with an image sensor of a camera such that the image sensor moves together with the dynamic platform;
a static platform;
multiple flexure arms that mechanically connect the dynamic platform to the static platform; and
one or more electrical traces to convey the image signals from the dynamic platform to the static platform, wherein at least a portion of the one or more electrical traces is routed from the dynamic platform to the static platform via one or more flexure arms of the multiple flexure arms;
wherein the VCM actuator is configured to move the dynamic platform such that the image sensor moves relative to the static platform in a plurality of directions orthogonal to an optical axis of the camera.
2. The VCM actuator of claim 1 , wherein:
the one or more flexure arms comprise a first flexure arm and a second flexure arm; and
the one or more electrical traces comprise:
a first electrical trace routed along a first side of the first flexure arm; and
a second electrical trace routed along a second side of the second flexure arm, the second side facing opposite the first side of the first flexure arm.
3. The VCM actuator of claim 1 , wherein:
the one or more flexure arms comprise metal flexure bodies that carry the at least a portion of the one or more electrical traces; and
the at least a portion of the one or more electrical traces are electrically isolated from the metal flexure bodies via one or more insulator layers.
4. The VCM actuator of claim 3 , wherein the one or more insulator layers comprise one or more polyimide layers.
5. The VCM actuator of claim 1 , wherein the one or more flexure arms include a first flexure arm and a second flexure arm that are parallel to each other.
6. The VCM actuator of claim 1 , wherein:
the one or more flexure arms comprise a first flexure arm and a second flexure arm;
the VCM actuator further comprises:
one or more flexure stabilizer members that mechanically connect flexure arms of the multiple flexure arms to each other such that the one or more flexure stabilizer members prevent interference between the flexure arms, the one or more flexure stabilizer members comprising a flexure stabilizer member that connects the first flexure arm to the second flexure arm; and
the at least a portion of the one or more electrical traces is further routed from the first flexure arm to the second flexure arm via the flexure stabilizer member.
7. The VCM actuator of claim 6 , wherein the flexure stabilizer member, that connects the first flexure arm to the second flexure arm, extends along an axis that is orthogonal to the first flexure arm and the second flexure arm.
8. The VCM actuator of claim 1 , wherein:
the dynamic platform includes:
a first portion that extends along a plane that is orthogonal to the optical axis;
a second portion that extends along the plane; and
a bend portion that extends along the plane and connects the first portion to the second portion; and
the multiple flexure arms include respective flexure arms that each include:
a respective first portion that is parallel to the first portion of the first frame;
a respective second portion that is parallel to the second portion of the first frame; and
a respective bend portion that connects the respective first portion to the respective second portion.
9. A camera, comprising:
a lens in a lens carrier, wherein the lens includes one or more lens elements that define an optical axis;
an image sensor to capture light passing through the lens and convert the captured light into image signals; and
a voice coil motor (VCM) actuator, comprising:
a dynamic platform configured to couple with the image sensor such that the image sensor moves together with the dynamic platform;
a static platform;
multiple flexure arms that mechanically connect the dynamic platform to the static platform; and
one or more electrical traces to convey the image signals from the dynamic platform to the static platform, wherein at least a portion of the one or more electrical traces is routed from the dynamic platform to the static platform via one or more flexure arms of the multiple flexure arms;
wherein the VCM actuator is configured to move the dynamic platform such that the image sensor moves relative to the static platform in a plurality of directions orthogonal to an optical axis of the camera.
10. The camera of claim 9 , wherein:
the one or more flexure arms comprise a first flexure arm and a second flexure arm; and
the one or more electrical traces comprise:
a first electrical trace routed along a first side of the first flexure arm; and
a second electrical trace routed along a second side of the second flexure arm, the second side facing opposite the first side of the first flexure arm.
11. The camera of claim 9 , wherein:
the one or more flexure arms comprise metal flexure bodies that carry the at least a portion of the one or more electrical traces; and
the at least a portion of the one or more electrical traces are electrically isolated from the metal flexure bodies via one or more insulator layers.
12. The camera of claim 9 , further comprising:
a flex circuit, comprising:
a first end fixed to the dynamic platform; and
a second end fixed to the static platform;
wherein:
the at least a portion of the one or more electrical traces that is routed from the dynamic platform to the static platform via the one or more flexure arms comprises at least a portion of a first set of the one or more electrical traces; and
at least a portion of a second set of the one or more electrical traces is routed from the dynamic platform to the static platform via the flex circuit.
13. The camera of claim 9 , wherein:
the VCM actuator is an optical image stabilization (OIS) VCM actuator; and
the OIS VCM actuator further comprises a plurality of OIS coils mounted to the dynamic platform within magnetic fields of a plurality of shared magnets mounted to an actuator base, for producing forces for moving the dynamic platform in the plurality of directions orthogonal to the optical axis.
14. The camera of claim 13 , wherein OIS coils of the plurality of OIS coils are mounted on the flex circuit.
15. The camera of any of claim 13 , further comprising:
an autofocus (AF) VCM actuator, comprising:
the lens carrier, moveably mounted to the actuator base; and
an AF coil fixedly mounted to the lens carrier within magnetic fields of the shared magnets, for producing forces for moving the lens carrier in a direction of the optical axis.
16. A multifunction device, comprising:
a camera, comprising:
a lens in a lens carrier, wherein the lens includes one or more lens elements that define an optical axis;
an image sensor to capture light passing through the lens and convert the captured light into image signals; and
a voice coil motor (VCM) actuator, comprising:
a dynamic platform configured to couple with the image sensor such that the image sensor moves together with the dynamic platform;
a static platform;
multiple flexure arms that mechanically connect the dynamic platform to the static platform; and
one or more electrical traces to convey the image signals from the dynamic platform to the static platform, wherein at least a portion of the one or more electrical traces is routed from the dynamic platform to the static platform via one or more flexure arms of the multiple flexure arms;
wherein the VCM actuator is configured to move the dynamic platform such that the image sensor moves relative to the static platform in a plurality of directions orthogonal to an optical axis of the camera;
one or more processors; and
memory storing program instructions that are executable by the one or more processors to control operation of the camera and to perform one or more other functions of the multifunction device.
17. The multifunction device of claim 16 , wherein:
the one or more flexure arms comprise a first flexure arm and a second flexure arm; and
the one or more electrical traces comprise:
a first electrical trace routed along a first side of the first flexure arm; and
a second electrical trace routed along a second side of the second flexure arm, the second side facing opposite the first side of the first flexure arm.
18. The multifunction device of claim 16 , wherein:
the one or more flexure arms comprise metal flexure bodies that carry the at least a portion of the one or more electrical traces; and
the at least a portion of the one or more electrical traces are electrically isolated from the metal flexure bodies via one or more insulator layers.
19. The multifunction device of claim 18 , wherein the one or more insulator layers comprise one or more polyimide layers.
20. The multifunction device of claim 16 , further comprising:
a display;
wherein the program instructions are executable by the one or more processors to:
cause the OIS VCM actuator to move the dynamic platform relative to the static platform in the plurality of directions orthogonal to the optical axis; and
cause the display to present an image based at least in part on one or more of the image signals conveyed from the dynamic platform to the static platform via the electrical traces.