Auto focus and optical image stabilization in a compact folded camera
Compact folded camera modules having auto-focus (AF) and optical image stabilization (OIS) capabilities and multi-aperture cameras including such modules. In an embodiment, a folded camera module 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, an image sensor and a lens module carrying a lens with a symmetry axis parallel to the second optical axis. The lens module can be actuated to move in first and second orthogonal directions in a plane perpendicular to the first optical axis, the movement in the first direction being for auto-focus and the movement in the second direction being for OIS. The OPFE can be actuated to tilt for OIS.
1. A folded camera module, comprising:
a) a lens module having a lens optical axis;
b) an optical path folding element (OPFE) for folding light from a first optical path to a second optical path towards an image sensor, the second optical path being along the lens optical axis, wherein the lens module is designed to be moved for focus along a first direction substantially parallel to the lens optical axis, wherein the OPFE is designed to be tilted for optical image stabilization (OIS) around an OPFE tilt axis that is parallel to a second direction to compensate only for tilt of the folded camera module around the second direction, and wherein the second direction is substantially orthogonal to both the first and second optical paths; and
a) an actuator arrangement that prevents tilt of the lens module around an axis substantially parallel to the first optical path.
2. The folded camera module of claim 1 , wherein the actuator arrangement prevents the tilt around the axis substantially parallel to the first optical path passively.
3. The folded camera module of claim 2 , wherein the actuator arrangement includes two actuators.
4. The folded camera module of claim 2 , wherein the actuator arrangement includes three actuators.
5. The folded camera module of claim 3 , wherein each actuator includes a magnet-coil pair.
6. The folded camera module of claim 4 , wherein each actuator includes a magnet-coil pair.
7. The folded camera module of claim 5 , wherein each magnet-coil pair has associated therewith a position sensor.
8. The folded camera module of claim 6 , wherein each magnet-coil pair has associated therewith a position sensor.
9. The folded camera module of claim 7 , wherein the position sensor is a Hall-bar sensor.
10. The folded camera module of claim 8 , wherein the position sensor is a Hall-bar sensor.
11. The folded camera module of claim 9 , wherein each coil and associated Hall-bar sensor are co-located on a base.
12. The folded camera module of claim 10 , wherein each coil and associated Hall-bar sensor are co-located on a base.
13. A dual-camera comprising the folded camera module of claim 1 and a non-folded camera module.
14. A dual-camera comprising the folded camera module of claim 2 and a non-folded camera module.