Folded camera with actuator for moving optics
Various embodiments include a camera with folded optics and lens shifting capabilities. In some examples, a folded optics arrangement of the camera may include one or more lens elements and light path folding elements (e.g., prisms). Some embodiments include voice coil motor (VCM) actuator arrangements, carrier arrangements, and/or suspension arrangements to provide autofocus (AF) and/or optical image stabilization (OIS) movement. Furthermore, some embodiments include position sensor arrangements for position sensing with respect to AF and/or OIS movement.
1. A camera, comprising:
a folded optics arrangement to fold a path of light, the folded optics arrangement comprising:
a first light folding element; and
a lens group comprising one or more lens elements that define an optical axis;
an image sensor;
a lens carrier coupled to the lens group; and
an actuator comprising a first magnet and a first coil to move the lens group in a first direction, wherein the first magnet and the first coil are both located on an opposite side of the light folding element from the lens group in a direction of the optical axis.
2. The camera of claim 1 , wherein the actuator further comprises:
a second coil attached to the lens carrier;
a third coil attached to a fixed structure that is stationary relative to movement of the lens group; and
a second magnet attached to a holder;
wherein the second coil and the second magnet are configured to move the lens carrier relative to the holder in a second direction orthogonal to the optical axis; and
wherein the third coil and the second magnet are configured to move the lens carrier and the holder together in a third direction orthogonal to the second direction and orthogonal to the optical axis.
3. The camera of claim 2 , wherein the first coil is attached to the holder, and the first magnet is stationary relative to movement of the lens group, wherein the first direction is parallel to the optical axis.
4. The camera of claim 3 , wherein:
the folded optics arrangement further comprises:
a second light folding element, wherein the lens group is disposed between the first light folding element and the second light folding element;
wherein the image sensor is configured to capture light that has passed through the first light folding element, the lens group, and the second light folding element;
the actuator is configured to move the lens group relative to the image sensor in the first, second, and third directions.
5. The camera of claim 3 , wherein the holder at least partially encircles the folded optics arrangement.
6. The camera of claim 2 , further comprising:
a suspension arrangement to suspend the lens group and allow movement of the lens group along multiple axes, the suspension arrangement comprising:
a leaf spring attached to the lens carrier structure and the holder, so as to allow movement of the lens group and the lens carrier together, relative to the holder, in at least the second direction; and
suspension wires to allow movement of the lens group, the lens carrier, and the holder together in the first and third directions, wherein a suspension wire of the suspension wires comprises:
a first end portion attached to the leaf spring; and
a second end portion attached to the fixed structure that is stationary relative to movement of the lens group.
7. A device, comprising:
one or more processors;
memory storing program instructions executable by the one or more processors to control operation of a camera; and
the camera, comprising:
a folded optics arrangement to fold a path of light, the folded optics arrangement comprising:
a first light folding element; and
a lens group comprising one or more lens elements that define an optical axis;
an image sensor;
a lens carrier coupled to the lens group; and
an actuator comprising a first magnet and a first coil to move the lens group in a first direction, wherein the first magnet and the first coil are both located on an opposite side of the light folding element from the lens group in a direction of the optical axis.
8. The device of claim 7 , wherein the actuator further comprises:
a second coil attached to the lens carrier;
a third coil attached to a fixed structure that is stationary relative to movement of the lens group; and
a second magnet attached to a holder;
wherein the second coil and the second magnet are configured to move the lens carrier relative to the holder in a second direction orthogonal to the optical axis; and
wherein the third coil and the second magnet are configured to move the lens carrier and the holder together in a third direction orthogonal to the second direction and orthogonal to the optical axis.
9. The device of claim 8 , wherein the first coil is attached to the holder, and the first magnet is stationary relative to movement of the lens group, wherein the first direction is parallel to the optical axis.
10. The device of claim 9 , wherein:
the folded optics arrangement further comprises:
a second light folding element, wherein the lens group is disposed between the first light folding element and the second light folding element;
wherein the image sensor is configured to capture light that has passed through the first light folding element, the lens group, and the second light folding element;
the actuator is configured to move the lens group relative to the image sensor in the first, second, and third directions.
11. The device of claim 9 , wherein the holder at least partially encircles the folded optics arrangement.
12. The device of claim 8 , further comprising:
a suspension arrangement to suspend the lens group and allow movement of the lens group along multiple axes, the suspension arrangement comprising:
a leaf spring attached to the lens carrier structure and the holder, so as to allow movement of the lens group and the lens carrier together, relative to the holder, in at least the second direction; and
suspension wires to allow movement of the lens group, the lens carrier, and the holder together in the first and third directions, wherein a suspension wire of the suspension wires comprises:
a first end portion attached to the leaf spring; and
a second end portion attached to the fixed structure that is stationary relative to movement of the lens group.
13. The device of claim 8 , wherein:
the first light folding element is a first prism comprising:
an object side through which light enters the first prism; and
a first reflecting surface side comprising a first reflective surface to redirect the light towards the lens group; and
the folded optics arrangement further comprises a second prism comprising:
a second reflecting surface side comprising a second reflective surface to redirect the light towards the image sensor; and
an image side through which the light exits the first prism, the image side proximate the image sensor.
14. The device of claim 13 , wherein:
the first reflecting surface side is angled relative to the object side of the first prism; and
the first magnet and first coil are disposed within a space under the first reflecting surface side.
15. The device of claim 8 , wherein the camera further comprises:
one or more position sensors configured to sense movement of the lens group in the first, second, and third directions.
16. A folded optics actuator system, comprising:
a lens carrier configured to hold a lens group spaced from a first light folding element; and
an actuator configured to move the lens group in a first direction, the actuator comprising:
a first magnet; and
a first coil,
wherein the first magnet and the first coil are both located on an opposite side of the light folding element from the lens group in a direction of the optical axis.
17. The folded optics actuator system of claim 16 , wherein the actuator further comprises:
a second coil attached to the lens carrier;
a third coil attached to a fixed structure that is stationary relative to movement of the lens group; and
a second magnet attached to a holder;
wherein the second coil and the second magnet are configured to move the lens carrier relative to the holder in a second direction orthogonal to the optical axis; and
wherein the third coil and the second magnet are configured to move the lens carrier and the holder together in a third direction orthogonal to the second direction and orthogonal to the optical axis.
18. The folded optics actuator system of claim 17 , wherein the first coil is attached to the holder, and the first magnet is stationary relative to movement of the lens group, wherein the first direction is parallel to the optical axis.
19. The folded optics actuator system of claim 18 , further comprising:
a second light folding element, wherein the lens group is disposed between the first light folding element and the second light folding element;
wherein the second light folding element is configured direct light that has passed through the first light folding element, the lens group, and the second light folding element to an image sensor; and
wherein the actuator is configured to move the lens group relative to the image sensor in the first, second, and third directions.
20. The folded optics actuator system of claim 18 , wherein the holder at least partially encircles the folded optics arrangement.