Optical-path folding-element with an extended two degree of freedom rotation range
Actuators for rotating an optical-path-folding-element with two, first and second, degrees of freedom in an extended rotation range around two respective rotation axes, folded cameras including such actuators and dual-cameras including a folded camera as above together with an upright camera.
1. A dual-camera, comprising:
an upright Wide camera having a Wide field-of-view FOV W and a Wide image sensor; and
a folded Tele camera having a Tele field-of-view FOV T <FOV W , the folded Tele camera comprising an optical path folding element (OPFE), a Tele image sensor, and an OPFE actuator,
wherein the OPFE actuator includes a first sub-assembly, a second sub-assembly and a stationary sub-assembly,
wherein the first sub-assembly is configured to rotate the OPFE relative to the stationary sub-assembly in an extended rotation range around a yaw rotation axis,
wherein the second sub-assembly is configured to rotate the OPFE relative to the first sub-assembly in an extended rotation range around a pitch rotation axis that is substantially perpendicular to the yaw rotation axis,
and wherein the dual-camera is included in a mobile device.
2. The dual-camera of claim 1 , wherein the OPFE actuator includes a first sensor configured to sense rotation around the yaw rotation axis and a second sensor configured to sense rotation around the pitch rotation axis, the first and second sensors being fixed to the stationary sub-assembly, and wherein at least one of the first sensor or the second sensor is a magnetic flux sensor.
3. The dual-camera of claim 1 , wherein the OPFE actuator includes a voice coil motor (VCM) that has a magnet and a coil, wherein the magnet is fixedly attached to one of the first sub-assembly or the second sub-assembly, wherein the coil is fixedly attached to the stationary sub-assembly, wherein a driving current in the coil creates a force that is translated to a torque around the yaw rotation axis, and wherein the second sensor is positioned such that sensing by the second sensor is decoupled from the rotation of the OPFE around the yaw rotation axis.
4. The dual-camera of claim 2 , wherein the second sensor position is such that the yaw rotation axis passes through the second sensor.
5. The dual-camera of claim 4 , wherein the yaw rotation axis passes through a center of the second sensor.
6. The dual-camera of claim 1 , wherein the mobile device includes a screen, and wherein the Wide image sensor lies in a plane parallel to the screen.
7. The dual-camera of claim 1 , wherein the mobile device includes a second upright camera.
8. The dual-camera of claim 1 , wherein the folded Tele camera is configured to shift the Tele image sensor for optical image stabilization.
9. The dual-camera of claim 1 , wherein the extended rotation range is equal to or greater than ±5 degrees.
10. The dual-camera of claim 1 , wherein the extended rotation range is equal to or greater than ±10 degrees.
11. The dual-camera of claim 1 , wherein the extended rotation range is between ±15-40 degrees.
12. The dual-camera of claim 1 , wherein the extended rotation range around the pitch rotation axis is different from the extended rotation range around the second rotation axis.
13. The dual-camera of claim 1 , wherein the OPFE redirects light that enters the folded Tele camera from the direction of a view section along a first optical path toward a second optical path along the lens optical axis, and wherein the OPFE actuator further comprises a pitch magnet located at a side of the OPFE that is opposite to a side facing the view section.
14. The dual-camera of claim 1 , wherein the folded Tele camera further comprises a lens module accommodating 3 to 7 lens elements along a lens optical axis.
15. The dual-camera of claim 1 , wherein both the Wide camera and the folded Tele camera have fixed focal lengths.
16. The dual-camera of claim 1 , wherein both the Wide camera and the folded Tele camera are auto-focus cameras.
17. The dual-camera of claim 1 , wherein the extended rotation range is used for scanning a scene.
18. The dual-camera of claim 1 , wherein the extended rotation range is used for performing optical image stabilization.
19. The dual-camera of claim 1 , wherein the OPFE is a prism.
20. The folded Tele camera of claim 1 , wherein the mobile device is a smartphone.