Auto focus and optical image stabilization with roll compensation in a compact folded camera
Folded digital camera module comprising an optical path folding element (OPFE) for folding light from a first optical path with a first optical axis to a second optical path with a second optical axis perpendicular to the first optical axis, an image sensor, and a lens module carrying a lens with a symmetry axis parallel to the second optical axis. The camera module is adapted to perform optical image stabilization (OIS) involving at least one tilt motion of the OPFE tilt around an axis such that the OPFE tilt creates an image Roll movement and a shift movement, the OPFE tilt-created image Roll movement compensating for a folded camera module-induced Roll movement and the shift movement cancelable by a movement of the lens module.
1. A folded camera module comprising:
a) an optical path folding element (OPFE) for folding light from a first optical path with a first optical axis to a second optical path with a second optical axis perpendicular to the first optical axis; and
b) a lens module carrying a lens with a symmetry axis parallel to the second optical axis, wherein the OPFE and the lens module are configured to provide optical image stabilization (OIS) compensating for roll, pitch, and yaw movement of the folded camera module, wherein the OPFE is designed to tilt around a first tilt axis in a plane formed by the first optical axis and the second optical axis, thereby generating a roll movement that compensates for roll movement of the folded camera module and for unwanted shift movement of the image, wherein the lens module is designed to move such that its movement compensates for yaw movement of the folded camera module and for the shift movement of the image, and wherein the OPFE is designed to tilt around a second tilt axis orthogonal to both the first optical axis and the second optical axis to compensate for pitch movement of the folded camera module.
2. The folded camera module of claim 1 , wherein the lens module design to move includes a design to move in a first direction orthogonal to both the first and second optical axes.
3. The folded camera module of claim 2 , wherein the lens module design to move further includes a design to move in a second direction parallel to the first optical axis.
4. The folded camera module of claim 3 , wherein the lens module is further designed to move for auto-focus in a direction parallel to the second optical axis.
5. A multi aperture digital camera comprising a folded camera module according to claim 4 and at least one other camera module.
6. A multi aperture digital camera comprising a folded camera module according to claim 3 and at least one other camera module.
7. A multi aperture digital camera comprising a folded camera module according to claim 2 and at least one other camera module.
8. The folded camera module of claim 1 , wherein the OPFE is selected from the group consisting of a prism, a mirror and a prism covered with a metallic reflecting surface.
9. A multi aperture digital camera comprising a folded camera module according to claim 8 and at least one other camera module.
10. A multi aperture digital camera comprising a folded camera module according to claim 1 and at least one other camera module.
11. A method of providing optical image stabilization in a folded camera module that includes an optical path folding element (OPFE) for folding light from a first optical path with a first optical axis to a second optical path with a second optical axis perpendicular to the first optical axis and a lens module carrying a lens with a symmetry axis parallel to the second optical axis, the method comprising:
a) tilting the OPFE around a first tilt axis in a plane formed by the first optical axis and the second optical axis, thereby generating a roll movement that compensates for roll movement of the folded camera module and for an unwanted shift movement of the image;
b) moving the lens module such as to compensate for yaw movement of the folded camera module and for the unwanted shift movement of the image; and
c) titling the OPFE around a second tilt axis orthogonal to both the first optical axis and the second optical axis thereby compensating for a pitch movement of the folded camera module.
12. The method of claim 11 , wherein the moving the lens module includes moving the lens module in a first direction orthogonal to both the first and second optical axes.
13. The method of claim 12 , wherein the moving the lens module includes moving the lens module in a second direction parallel to the first optical axis.
14. The method of claim 11 , further comprising moving the lens module for auto-focus in a direction parallel to the second optical axis.
15. The method of claim 11 , wherein the OPFE is selected from the group consisting of a prism, a mirror and a prism covered with a metallic reflecting surface.