Camera with image sensor shifting
Various embodiments include a camera voice coil motor (VCM) actuator configured to shift an image sensor along multiple axes. Some embodiments include a magnet and coil arrangement. Some embodiments include a position sensing arrangement. Some embodiments include a flexure arrangement. Some embodiments include a coil structure and coil carrier assembly.
1. A camera, comprising:
a lens comprising one or more lens elements;
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:
magnets; and
a coil structure including optical image stabilization (OIS) coils to shift the image sensor in directions orthogonal to an optical axis to provide OIS, wherein each of the OIS coils is located proximate a respective magnet of the magnets; and
a flexure arrangement to guide motion of the coil structure and image sensor in a controlled manner, wherein the flexure arrangement comprises:
one or more flexure arms attached to move with the coil structure at one end and attached to a stationary component of the camera at another end;
one or more leaf structures each having a portion attached to the coil structure; and
one or more wires attached to the stationary component of the camera at one end;
wherein another portion of each of the one or more leaf structures is attached to a respective wire of the one or more wires to support the coil structure and such that the one or more wires flex when the coil structure moves with the image sensor.
2. The camera of claim 1 , wherein:
the magnets are stationary; and
the coil structure is movable relative to the magnets.
3. The camera of claim 1 , wherein each of the magnets is a corner magnet that is located proximate a respective corner of the camera.
4. The camera of claim 1 , wherein each of the magnets is a side magnet that is located proximate a respective side of the camera.
5. The camera of claim 1 , wherein the coil structure also includes an autofocus (AF) coil to shift the image sensor along the optical axis of the camera to provide AF, wherein the AF coil is located below, above, or both below and above the magnets.
6. The camera of claim 5 , wherein the AF coil is located below the magnets, the camera further comprising a top AF coil to assist in shifting the image sensor along the optical axis to provide AF, wherein the top AF coil is located above the magnets.
7. The camera of claim 1 , wherein the VCM actuator further comprises:
a substrate coupled to the coil structure and to the image sensor such that the image sensor moves together with the substrate.
8. The camera of claim 7 , wherein the one or more flexure arms are part of a bottom flexure to guide motion of the substrate in a controlled manner, wherein the bottom flexure further comprises:
a movable platform attached to the substrate; and
a stationary platform attached to the stationary component of the camera;
wherein the one or more flexure arms connect the movable platform to the stationary platform.
9. The camera of claim 8 , wherein the flexure arrangement further comprises a top flexure including the one or more leaf structures and the one or more wires, wherein the one or more leaf structures extend above the bottom flexure to assist in suspending and guiding the substrate.
10. The camera of claim 9 , wherein:
the bottom flexure extends along a first plane that is orthogonal to the optical axis of the camera;
the one or more leaf structures of the top flexure extends along a second plane that is orthogonal to the optical axis; and
the first plane is closer to the image sensor than the second plane.
11. The camera of claim 1 , wherein:
the magnets include four magnets;
the OIS coils include four OIS coils; and
each of the four OIS coils is located proximate a respective one of the four magnets.
12. The camera of claim 1 , further comprising:
a coil carrier to hold the coil structure;
wherein:
the coil carrier includes at least two windows; and
each of the at least two windows is sized to accommodate at least a portion of a respective position sensor of the camera.
13. The camera of claim 1 , further comprising:
a first position sensor disposed proximate a first OIS coil of the OIS coils;
a second position sensor disposed proximate a second OIS coil of the OIS coils; and
wherein:
the first OIS coil is part of a first pair of opposing OIS coils that contribute to OIS movement in a first direction;
the first position sensor is positioned to sense the OIS movement in the first direction;
the second OIS coil is part of a second pair of opposing OIS coils that contribute to OIS movement in a second direction that is orthogonal to the first direction; and
the second position sensor is positioned to sense the OIS movement in the second direction.
14. The camera of claim 13 , wherein the first position sensor and the second position sensor are positioned to sense AF movement.
15. The camera of claim 1 , wherein the coil structure comprises:
a base portion that includes an autofocus (AF) coil; and
tab portions that extend from the base portion, wherein each of the tab portions includes:
a respective optical image stabilization (OIS) coil of the OIS coils; and
a respective fold portion between the base portion and the respective OIS coil, wherein the coil structure is folded at the respective fold portion to orient the respective OIS coil at an angle relative to the AF coil.
16. The camera of claim 15 , wherein the AF coil is sized to surround the image sensor of the camera.
17. The camera of claim 1 , wherein the coil structure is formed of a flex circuit and the OIS coils are formed on the flex circuit via an additive deposition process.
18. A device, comprising:
a display;
a camera, comprising:
a lens comprising one or more lens elements;
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:
magnets; and
a coil structure including optical image stabilization (OIS) coils to shift the image sensor in directions orthogonal to an optical axis to provide OIS, wherein each of the OIS coils is located proximate a respective magnet of the magnets; and
a flexure arrangement to guide motion of the coil structure and image sensor in a controlled manner, wherein the flexure arrangement comprises:
one or more flexure arms attached to move with the coil structure at one end and attached to a stationary component of the camera at another end;
one or more leaf structures each having a portion attached to the coil structure; and
one or more wires attached to the stationary component of the camera at one end;
wherein another portion of each of the one or more leaf structures is attached to a respective wire of the one or more wires to support the coil structure and such that the one or more wires flex when the coil structure moves with the image sensor; and
a processor configured to cause the image signals from the image sensor to be displayed on the display as an image.
19. The device of claim 18 , wherein the coil structure also includes an autofocus (AF) coil to shift the image sensor along the optical axis of the camera to provide AF, wherein the AF coil is located below, above, or both below and above the magnets.
20. The device of claim 18 , wherein the VCM actuator further comprises:
a substrate coupled to the coil structure and to the image sensor such that the image sensor moves together with the substrate;
wherein the one or more flexure arms are part of a bottom flexure to guide motion of the substrate in a controlled manner, wherein the bottom flexure further comprises:
a movable platform attached to the substrate; and
a stationary platform attached to the stationary component of the camera;
wherein the one or more flexure arms connect the movable platform to the stationary platform.