Stabilizer for an Optical Device and Electronic Device Comprising the Same

• US 20160142634A1
• Filed: 06/10/2014
• Published: 05/19/2016
• Est. Priority Date: 06/28/2013
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Technologies Oy (Nokia Corporation)
• Inventors: YOU, Yiping, FAN, Rongli, SHAN, Depeng, YANG, Lei
• Granted Patent: US 9,706,124 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 27/642 Optical derotators, i.e. systems for compensating for image rotation, e.g. using rotating prisms, mirrors
• CPC Class Codes: G02B 27/646 compensating for small deviations, e.g. due to vibration or shake movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68
• CPC Class Codes: G03B 2205/0023 by tilting or inclining one or more optical elements with respect to the optical axis
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 29/00 Combinations of cameras, projectors or photographic printing apparatus with non-photographic non-optical apparatus, e.g. clocks or weapons; Cameras having the shape of other objects combinations with flash apparatus G03B15/03
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

There is provided a stabilizer for an optical device that forms part of an electronic device and an electronic device including the stabilizer. The stabilizer includes two first actuators, each of which includes a first coil assembly and a first block of ferromagnetic material, each of the two first coil assemblies being configured to generate, in response to a first electrical signal applied thereto, a first attraction force toward a respective first block of ferromagnetic material, the first blocks of ferromagnetic material being attached to a socket for the optical device; and a rotating device configured to rotate the socket around an optical axis of the optical device in response to the first attraction force. The image stabilization solution according to the present invention is both applicable to AF camera modules and to fix focus camera modules.

Claims

1. A stabilizer for an optical device that forms part of an electronic device, comprising:

two first actuators, each of which comprises a first coil assembly and a first block of ferromagnetic material, each of the two first coil assemblies being configured to generate, in response to a first electrical signal applied thereto, a first attraction force toward a respective first block of ferromagnetic material, the first blocks of ferromagnetic material being attached to a socket for the optical device; and

a rotating device configured to rotate the socket around an optical axis of the optical device in response to the first attraction force.

2. The stabilizer according to claim 1, wherein the rotating device comprises a bearing coaxial with the optical axis, the bearing comprising a fixed outer part and a rotatable inner part, and the inner part being attached to the socket.

3. The stabilizer according to claim 1, further comprising:

a pair of second actuators, each of the second actuators comprising a second coil assembly and a second block of ferromagnetic material, the two second blocks being attached to the optical device and arranged to be opposite to each other with respect to the optical axis, each of the two second coil assemblies being secured to the socket and configured to attract, in response to a second electrical signal applied thereto, a respective second block, resulting in a tilt of the optical device towards a respective second coil assembly; and

a pair of third actuators, each of the third actuators comprising a third coil assembly and a third block of ferromagnetic material, the two third blocks being attached to the optical device and arranged to be opposite to each other with respect to the optical axis, each of the two third coil assemblies being secured to the socket and configured to attract, in response to a third electrical signal applied thereto, a respective third block, resulting in another tilt of the optical device towards a respective third coil assembly.

4. The stabilizer according to claim 1, wherein the two second blocks of ferromagnetic material and the two third blocks of ferromagnetic material are located at the same distance from a bottom of the optical device, wherein a first line through centers of the two second blocks is perpendicular to a second line through centers of the two third blocks, and wherein the first and second lines intersect at the optical axis.

5. The stabilizer according to claim 1, wherein at least four resilient projections are arranged substantially uniformly on the inner peripheral surface of the socket, and at least four recesses are formed on the outer peripheral surface of the optical device for receiving the four resilient projections respectively.

6. The stabilizer according to claim 1, wherein each of the four resilient projections comprises a curved edge along or adjacent to the outer peripheral surface of the optical device.

7. The stabilizer according to claim 1, wherein a plurality of spring pins are arranged on an inner surface of a bottom of the socket for communicating electrical signals to or from the optical device.

8. The stabilizer according to claim 1, wherein each of the first, second and third blocks of ferromagnetic material comprises one of the following:

magnet, ferrite and iron.

9. An electronic device, comprising:

at least one optical device;

at least one stabilizer according to claim 1;

a gyroscope sensor being external to the optical device, and configured to sense movements of the electronic device and generate a movement signal indicative of the movements; and

a controller configured to generate, based on the movement signal, control signals for each of the at least one stabilizer;

wherein each of the at least one stabilizer is configured to tilt or rotate, in response to a respective control signal from the controller, the at least one optical device so as to compensate for the movements.

10. The electronic device according to claim 9, wherein the controller is further configured to detect changes in inductance of the first, second and third coil assemblies of the each stabilizer so as to adjust an amplitude and/or a duty of the respective control signal.

11. The electronic device according to claim 9, wherein the at least one optical device comprises a flexible conductor for communicating electrical signals to or from the optical device.

12. The electronic device according to claim 9, wherein the electronic device comprises two optical devices, and the gyroscope sensor is positioned at a midpoint between the two optical devices.

13. The electronic device according to claim 9, wherein at least one of the two optical device comprises a digital still camera or a digital video camera.