Dual voice coil motor structure in a dual-optical module camera

Patent metadata

Field	Value
Publication number	US-10015384-B2
Application number	US-201615117189-A
Country	US
Kind code	B2
Filing date	Feb 17, 2016
Priority date	Apr 2, 2015
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

Dual-optical module autofocus (AF) or AF plus optical image stabilization (OIS) cameras with reduced footprint and reduced mutual magnetic interference. Some AF+OIS cameras may include a single AF actuation assembly that moves two lens barrels in unison. Some AF cameras or AF+OIS cameras may have two AF actuation sub-assemblies and associated magnets for independent AF operation of each lens barrel, the magnets shared in a manner that cancels magnetic influences of one AF actuation sub-assembly on the other AF actuation sub-assembly, thereby allowing the two lens barrels to be positioned in close proximity, saving parts and fabrication costs.

First claim

What is claimed is:

1. An imaging device comprising:
a) a first lens module having a first optical axis and including a first lens carrier with a first lens carrier external surface, the first lens carrier having a first coil wound around at least part of the first lens carrier external surface and a first plurality of magnets surrounding the first coil;
b) a second lens module having a second optical axis parallel to the first optical axis and including a second lens carrier with a second lens carrier external surface, the second lens carrier having a second coil wound around at least part of the second lens carrier external surface and a second plurality of magnets surrounding the second coil, wherein the first and second pluralities of magnets share at least one common magnet and wherein each of the first and second plurality of magnets is part of an auto-focus sub-assembly of the respective lens module; and
c) an OIS mechanism comprising a plurality of optical image stabilization (OIS) coils, wherein each OIS coil is associated with at least one of the magnets of the first plurality or second plurality of magnets, the magnets of the first plurality and second plurality of magnets being coupled to each other by a frame, and wherein the OIS coils are configured to move the frame in a plane substantially perpendicular to both the first optical axis and the second optical axis to perform OIS.

2. The imaging device of claim 1 , wherein the magnets of the first plurality of magnets have north poles pointing toward the first optical axis and wherein the magnets of the second plurality of magnets have south poles pointing toward the second optical axis.

3. The imaging device of claim 1 , wherein the first and second pluralities of magnets include a combined total of four to seven magnets.

4. The imaging device of claim 1 , wherein each of the first and second lens carriers and associated coils is movable relative its respective plurality of magnets and the frame, and wherein the movement of each lens carrier and associated coil is independent of the movement of the other lens carrier and associated coil.

5. The imaging device of claim 1 , wherein the first and second pluralities of magnets include a combined total of four to seven magnets.

6. The imaging device of claim 1 , further comprising a position sensing mechanism for sensing motion in two directions in a plane perpendicular to the optical axes, the position sensing in one direction being independent of the position sensing in the other direction.

7. The imaging device of claim 6 , wherein the position sensing mechanism includes at least one Hall bar.

8. The imaging device of claim 1 , further comprising a position sensing mechanism for sensing unwanted roll motion of the frame around a roll axis that is substantially parallel to both optical axes, wherein the OIS mechanism is further configured, responsive to sensing the unwanted roll motion of the frame, to rotate the frame around the roll axis in order to cancel the unwanted roll motion.

9. The imaging device of claim 8 , wherein the roll motion sensing mechanism includes at least one Hall bar.

10. The imaging device of claim 8 , wherein the position sensing mechanism for sensing unwanted roll motion of the frame around a roll axis includes at least two sensors, and wherein the unwanted roll motion is detected based on a difference between the measurements of the two sensors.

Assignees

• Corephotonics Ltd

Inventors

• Bachar Gil
• Goldenberg Ephraim
• Avivi Gal

Classifications

• G02B13/009

  having zoom function · CPC title

• G02B13/001

  Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras (G02B23/243 takes precedence) · CPC title

• G03B2205/0069

  using electromagnetic actuators, e.g. voice coils · CPC title

• G02B7/09

  adapted for automatic focusing or varying magnification · CPC title

• G03B5/02

  Lateral adjustment of lens · CPC title