Camera actuator for lens and sensor shifting
Some embodiments include a camera voice coil motor (VCM) actuator configured to shift a lens and/or an image sensor along multiple axes. The VCM actuator may include a bottom flexure and a top flexure that connect one or more dynamic members to one or more static members. The VCM actuator may include stationary magnets and coils held by dynamic members. In some cases, the VCM actuator may be configured to move the image sensor along an optical axis, to move the image sensor in directions orthogonal to the optical axis, and/or to tilt the image sensor relative to the orthogonal axis. In some examples, the VCM actuator may be configured to move the image sensor in directions orthogonal to the optical axis, to move the lens along the optical axis, and/or to tilt the lens relative to the optical axis.
1. A camera, comprising:
a lens that defines an optical axis;
an image sensor configured to capture light passing through the lens and convert captured light into image signals;
a voice coil motor (VCM) actuator, comprising:
a plurality of magnets; and
a plurality of coils;
a sensor shift platform coupled to the image sensor such that the image sensor is moveable together with the sensor shift platform;
one or more flexures to mechanically connect one or more dynamic components of the camera to one or more static components of the camera, wherein the one or more dynamic components include the sensor shift platform; and
a coil holder coupled with a first coil and a second coil of the plurality of coils, such that the first coil and the second coil are positioned orthogonal to one another;
wherein to tilt the image sensor or the lens, the VCM actuator is configured to cause at least one of the first coil or the second coil to magnetically interact with a respective magnet of the plurality of magnets.
2. The camera of claim 1 , wherein to tilt the image sensor or the lens, the VCM actuator is configured to cause the first coil to magnetically interact with the respective magnet of the plurality of magnets independently relative to the second coil and another respective magnet of the plurality of magnets.
3. The camera of claim 1 , wherein the plurality of coils further comprises:
an optical image stabilization (OIS) coil, wherein the OIS coil is attached to the coil holder and positioned proximate the respective magnet of the plurality of magnets;
wherein the VCM actuator is configured to cause the OIS coil to magnetically interact with the respective magnet of the plurality of magnets to move the image sensor in a direction orthogonal to the optical axis.
4. The camera of claim 1 , wherein the lens is a stationary lens.
5. The camera of claim 1 , wherein the one or more flexures comprise:
a bottom flexure that extends along a first plane orthogonal to the optical axis; and
a top flexure that extends along a second plane orthogonal to the optical axis.
6. The camera of claim 1 , wherein the camera is configured to convey current to drive at least one of the first coil or the second coil via at least one flexure of the one or more flexures.
7. The camera of claim 1 , wherein the VCM actuator is configured to cause at least one of the first coil or the second coil to magnetically interact with a respective magnet of the plurality of magnets to tilt the image sensor, and the coil holder is attached to the sensor shift platform.
8. The camera of claim 7 , wherein the first coil and the second coil are also configured to move the sensor shift platform and the image sensor in directions parallel to the optical axis for autofocus (AF).
9. The camera of claim 1 , wherein the lens is configured to move in directions along the optical axis for autofocus (AF).
10. The camera of claim 9 , wherein the VCM actuator is configured to cause at least one of the first coil or the second coil to magnetically interact with a respective magnet of the plurality of magnets to tilt the lens, and the coil holder is fixedly attached to the lens and moves independently of the sensor shift platform and the image sensor.
11. The camera of claim 9 , wherein the plurality of coils further comprises:
an optical image stabilization (OIS) coil, wherein the OIS coil is attached to the sensor shift platform and positioned proximate a respective magnet of the plurality of magnets;
wherein the VCM actuator is configured to cause the OIS coil to magnetically interact with the respective magnet of the plurality of magnets to move the image sensor in a direction orthogonal to the optical axis independently of the coil holder.
12. A device, comprising:
one or more processors;
memory storing program instructions that are executable by the one or more processors to control operation of a camera; and
the camera, comprising:
a lens that defines an optical axis;
an image sensor configured to capture light passing through the lens and convert the captured light into image signals;
a voice coil motor (VCM) actuator, comprising:
a plurality of magnets; and
a plurality of coils;
a sensor shift platform coupled to the image sensor such that the image sensor is moveable together with the sensor shift platform;
flexures to mechanically connect one or more dynamic components of the camera to one or more static components of the camera, wherein the one or more dynamic components include the sensor shift platform; and
a coil holder coupled with a first coil and a second coil of the plurality of coils, such that the first coil and the second coil are positioned orthogonal to one another;
wherein to tilt the image sensor or the lens, the VCM actuator is configured to cause at least one of the first coil and the second coil to magnetically interact with a respective magnet of the plurality of magnets.
13. The device of claim 12 , wherein the VCM actuator is configured to cause at least one of the first coil or the second coil to magnetically interact with a respective magnet of the plurality of magnets to tilt the image sensor, and the coil holder is attached to the sensor shift platform.
14. The device of claim 13 , wherein the first coil and the second coil are also configured to move the sensor shift platform and the image sensor in directions parallel to the optical axis for autofocus (AF).
15. The device of claim 12 , wherein the lens is configured to move in directions along the optical axis for autofocus (AF).
16. The device of claim 15 , wherein the VCM actuator is configured to cause at least one of the first coil or the second coil to magnetically interact with a respective magnet of the plurality of magnets to tilt the lens, and the coil holder is fixedly attached to the lens and moves independently of the sensor shift platform and the image sensor.
17. The device of claim 15 , wherein the plurality of coils further comprises:
an optical image stabilization (OIS) coil, wherein the OIS coil is attached to the sensor shift platform and positioned proximate the respective magnet of the plurality of magnets;
wherein the VCM actuator is configured to cause the OIS coil to magnetically interact with the respective magnet of the plurality of magnets to move the image sensor in a direction orthogonal to the optical axis independently of the coil holder.
18. A system, comprising:
a voice coil motor (VCM) actuator, comprising:
a plurality of magnets; and
a plurality of coils;
a sensor shift platform for coupling with an image sensor of a camera, such that the image sensor is moveable together with the sensor shift platform;
flexures to mechanically connect one or more dynamic components of the camera to one or more static components of the camera, wherein the one or more dynamic components include the sensor shift platform; and
a coil holder coupled with a first coil and a second coil of the plurality of coils, such that the first coil and the second coil are positioned orthogonal to one another;
wherein to tilt the image sensor or a lens, the VCM actuator is configured to cause at least one of the first coil or the second coil to magnetically interact with a respective magnet of the plurality of magnets.
19. The system of claim 18 , wherein the VCM actuator is configured to cause at least one of the first coil or the second coil to magnetically interact with a respective magnet of the plurality of magnets to tilt the image sensor, and the coil holder is attached to an upper surface of the sensor shift platform.
20. The system of claim 18 , wherein the VCM actuator is configured to cause at least one of the first coil or the second coil to magnetically interact with a respective magnet of the plurality of magnets to tilt the lens, and the coil holder is fixedly attached to the lens and moves independently of the sensor shift platform and the image sensor.