Lens moving apparatus

Patent metadata

Field	Value
Publication number	US-9977255-B2
Application number	US-201514971365-A
Country	US
Kind code	B2
Filing date	Dec 16, 2015
Priority date	Dec 17, 2014
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

An embodiment includes a bobbin provided at an outer circumferential surface thereof with a first coil, a first position sensor disposed on the outer circumferential surface of the bobbin and spaced apart from the first coil, a first magnet disposed so as to be opposite to the first position sensor, a second magnet disposed so as to be opposite to the first coil, the second magnet being configured to move the bobbin in a direction parallel to an optical axis via electromagnetic interaction with the first coil, a housing configured to support the first magnet and the second magnet; and upper and lower elastic members coupled to the bobbin and the housing, wherein the first position sensor is moved along with the bobbin.

First claim

What is claimed is:

1. A lens moving apparatus comprising:
a housing comprising first side portions and second side portions located between the first side portions;
a bobbin disposed inside the housing, wherein an outer surface of the bobbin comprises first side surfaces corresponding to the first side portions and second side surfaces located between the first side surfaces, and wherein the bobbin is configured to move in a first direction along an optical axis;
a first coil disposed on the bobbin;
a first position sensor disposed on one side surface of the second side surfaces of the bobbin;
a first magnet disposed on one of the second side portions of the housing corresponding to one side surface of the second side surfaces of the bobbin so as to be opposite to the first position sensor in a second direction perpendicular to the first direction;
a second magnet comprising a first driving magnet disposed on one of the first side portions of the housing, wherein the first driving magnet is disposed opposite to the first coil in a third direction perpendicular to the first direction and wherein the second magnet is configured to move the bobbin in the first direction via an electromagnetic interaction with the first coil;
and
an upper elastic member coupled to an upper surface of the bobbin and an upper surface of the housing, wherein the upper elastic member comprises an inner frame coupled to the upper surface of the bobbin, an outer frame coupled to the upper surface of the housing, and a frame connection portion connecting the inner frame to the outer frame;
wherein the first position sensor is mounted on the outer surface of the bobbin and spaced apart from the first coil,
wherein the housing comprises a first seating recess provided in an inner side surface of the one of the second side portions of the housing, and the first magnet is disposed in the first seating recess, and
wherein the first magnet is not protruded from the upper surface of the housing in the first direction, and the first position sensor is not protruded from the upper surface of the bobbin in the first direction.

2. The lens moving apparatus according to claim 1 , further comprising:
a lower elastic member coupled to a lower surface of the bobbin and a lower surface of the housing;
a circuit member including a second coil disposed below the housing, wherein the second coil is opposite to the second magnet;
a circuit board disposed below the circuit member and comprising a plurality of terminals, wherein the second coil is electrically connected to the circuit board;
a second position sensor disposed below the circuit board;
a base disposed below the circuit board and comprising an opening; and
a support member configured to support the housing such that the housing is movable relative to the base,
wherein the support member connects at least any one of the upper elastic member and the lower elastic member to the circuit board, and
wherein the second magnet further comprises a second driving magnet disposed opposite to the first driving magnet, a third driving magnet, and a fourth driving magnet disposed opposite to the third driving magnet.

3. The lens moving apparatus according to claim 2 , wherein the first position sensor is electrically connected to at least one of the upper elastic member or the lower elastic member, and
wherein the first side portions of the housing include four side portions of the housing, and the first driving magnet, the second driving magnet, the third driving magnet, and the fourth driving magnet are disposed on the four side portions of the housing, respectively.

4. The lens moving apparatus according to claim 3 , wherein the first coil is located at a lower portion of the outer surface of the bobbin, and the first position sensor is located at an upper portion of the outer surface of the bobbin;
wherein the inner frame of the upper elastic member is disposed on the upper surface of the bobbin and fixed to the upper surface of the bobbin by an adhesive member, and
wherein the second side portions of the housing include four side portions respectively disposed on four corners of the housing.

5. The lens moving apparatus according to claim 4 , wherein the first position sensor is overlapped with at least a portion of the first magnet in the second direction at an initial position of the bobbin, and
wherein the first position sensor is disposed at a position same as or lower than the upper surface of the bobbin.

6. The lens moving apparatus according to claim 2 , wherein the second position sensor comprises two Hall sensors, and
wherein the base comprises two second seating recesses formed on an upper surface of the base and support bosses formed on the upper surface of the base;
wherein the two Hall sensors are disposed in the two second seating recesses, respectively, and
wherein the circuit board comprises through-holes corresponding to the support bosses of the base;
wherein the support bosses of the base and the through-holes of the circuit board are coupled or fixed to each other by thermal bonding or an adhesive member, and
wherein the support bosses of the base comprises a first support boss disposed at a corner of the base and a second support boss disposed opposite to the first support boss at the base.

7. The lens moving apparatus according to claim 6 , wherein the two Hall sensors are disposed perpendicular to each other in order to sense the displacement of the housing relative to the base in a direction of X-axis or in a direction of Y-axis perpendicular to the optical axis,
wherein the plurality of terminals is configured to receive power from an external source and to supply the power to the first and second coils and the first and second position sensors and is configured to externally output signals from the first and second position sensors.

8. The lens moving apparatus according to claim 2 , wherein the first coil has an octagonal shape including eight outer side surfaces, and
wherein four outer side surfaces of the eight outer side surfaces of the first coil facing the second magnet are disposed on the first side surfaces, and the remaining four outer side surfaces of the eight outer side surfaces of the first coil not facing the second magnet are disposed on the second side surfaces.

9. The lens moving apparatus according to claim 2 , wherein the base comprises a support portion formed at an outer side surface of the base,
wherein the circuit board comprises a flexible printed circuit board having at least one terminal surface,
wherein the at least one terminal surface is bent from an upper surface of the flexible printed circuit board and disposed on the support portion of the base, and the plurality of terminals are disposed on the terminal surface, and
wherein the first position sensor includes a driver or the first position sensor is a sensor alone, and the first position sensor includes a Hall sensor.

10. The lens moving apparatus according to claim 9 , wherein the circuit member is an FP coil that is a patterned coil,
wherein the base comprises a recess formed at a corner of the base, and the support member is disposed at the recess of the base, and
wherein the flexible printed circuit board comprises two terminal surfaces.

11. The lens moving apparatus according to claim 2 , wherein the housing comprises a stopper protruded from the upper surface of the housing and at least one upper support boss formed on the upper surface of the housing,
wherein the at least one upper support boss is coupled to the upper elastic member, and an upper end of the stopper is higher than an upper end of the at least one upper support bo

Assignees

• Lg Innotek Co Ltd

Inventors

• Park Sang Ok
• Min Sang Jun
• Jung Tae Jin
• Yoo Hyune O

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• H04N23/51

  Housings · CPC title

• G03B5/00 Primary

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G02B27/646 Primary

  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 title

• G03B13/36

  Autofocus systems · CPC title