Lens driving device and camera module comprising same

Patent metadata

Field	Value
Publication number	US-2016377881-A1
Application number	US-201415109590-A
Country	US
Kind code	A1
Filing date	Dec 30, 2014
Priority date	Jan 2, 2014
Publication date	Dec 29, 2016
Grant date	—

Abstract

A lens driving device according to an embodiment comprises: a bobbin wherein at least one lens is installed inside thereof and a first coil is installed on the outer circumferential surface thereof; a first magnet arranged around the bobbin so as to be opposite to the first coil; a housing for supporting the first magnet; upper and lower elastic members coupled with the bobbin and the housing; a first sensor for sensing displacement of the bobbin in the first direction; a second magnet arranged so as to be opposite to the first sensor; a base arranged to be spaced apart from the housing by a certain distance; a second coil arranged so as to be opposite to the first magnet; a circuit board whereon the second coil is installed; a plurality of support members for supporting the housing so as to be movable in the second and third directions which are orthogonal to the first direction with respect to the base and for connecting at least one of the upper and lower elastic members to the circuit board; and a second sensor for sensing displacement of the housing in the second or third direction with respect to the base.

First claim

1 . A lens driving apparatus comprising:
a bobbin accommodating at least one lens therein, a first coil being disposed at an outer circumferential surface thereof; a first magnet disposed near the bobbin so as to face the first coil; a housing supporting the first magnet; upper and lower elastic members each coupled to both the bobbin and the housing; a first sensor detecting displacement of the bobbin in a first direction; a second magnet disposed to face the first sensor; a base disposed so as to be spaced apart from the housing by a predetermined distance; a second coil disposed so as to face the first magnet; a circuit board on which the second coil is mounted; a plurality of support members supporting the housing such that the housing is movable with respect to the base in second and third directions, which are perpendicular to the first direction, the support members connecting at least one of the upper or lower elastic member to the circuit board; and a second sensor detecting displacement of the housing with respect to the base in the second and third directions.

2 . The lens driving apparatus according to claim 1 , wherein the upper elastic member includes at least four first to fourth upper elastic members, which are separated from one another, and
wherein the first sensor is connected to the plurality of support members via the first to fourth upper elastic members.

3 . The lens driving apparatus according to claim 2 , wherein the lower elastic member includes at least two first and second lower elastic members, which are separated from each other, and
wherein the first coil is connected to the plurality of support members via the first and second lower elastic members.

4 . The lens driving apparatus according to claim 2 , wherein the first sensor is disposed, coupled or mounted on the bobbin and is moved therewith.

5 . The lens driving apparatus according to claim 4 , further comprising a sensor substrate coupled to the bobbin,
wherein the first sensor is configured to have a shape capable of being disposed, coupled or mounted on the sensor substrate.

6 . The lens driving apparatus according to claim 5 , wherein the first sensor is disposed, coupled or mounted on an upper side, a lower side or a center of an outer circumferential surface of the sensor substrate.

7 . The lens driving apparatus according to claim 5 , wherein the sensor substrate has a mounting recess formed in an outer circumferential thereof, and
wherein the first sensor is inserted into the mounting recess.

8 . The lens driving apparatus according to claim 5 , wherein the sensor substrate comprises:
a body configured to face an outer circumferential surface of the bobbin, the first sensor being disposed, coupled or mounted on the body; an elastic member contact protruding from the body in the first direction and being connected to the first to fourth upper elastic members; and a circuit pattern formed at the body so as to connect a terminal of the first sensor to the elastic member contact.

9 . The lens driving apparatus according to claim 1 , wherein the first and second magnets are integrally formed with each other.

10 . The lens driving apparatus according to claim 1 , wherein the first and second magnets are formed separately from each other.

11 . The lens driving apparatus according to claim 9 , wherein the first sensor and the first magnet are disposed to face each other such that an imaginary center horizontal line, which extends through a center of the first sensor and is perpendicular to an optical axis, is aligned with an upper end of the first magnet.

12 . The lens driving apparatus according to claim 11 , wherein the bobbin is moved upward and downward in an optical axis direction with respect to a reference point at which the imaginary center horizontal line coincides with the upper end of the first magnet.

13 . The lens driving apparatus according to claim 1 , wherein the lower elastic member includes at least four first to fourth lower elastic members, which are separated from one another, and
wherein the first sensor is connected to the plurality of support members via the first to fourth lower elastic members.

14 . A lens driving apparatus comprising:
a mover including a bobbin holding a lens unit and a coil disposed on an outer surface of the bobbin; a stator supporting the mover; a first sensor disposed on the outer surface of the bobbin so as to detect movement of the bobbin; and an elastic member including a first elastic part and a second elastic member, the first elastic part being connected at respective ends thereof to first sides of the bobbin and the stator so as to allow power to be applied to the coil, and a second elastic part being connected at respective ends thereof to second sides of the bobbin and the stator so as to be conductively connected to the first sensor.

15 . The lens driving apparatus according to claim 14 , wherein the first elastic part is disposed at an upper side of the bobbin and the second elastic part is disposed at a lower side of the bobbin.

16 . The lens driving apparatus according to claim 14 , wherein the first elastic part is disposed at a lower side of the bobbin and the second elastic part is disposed at an upper side of the bobbin.

17 . The lens driving apparatus according to claim 14 , wherein the first elastic part includes a first spring and a second spring, which are disposed so as to be spaced apart from each other.

18 . The lens driving apparatus according to claim 14 , wherein at least one of the first or second elastic part is configured to have a shape symmetrical in a direction perpendicular to a direction in which the mover is moved.

19 . The lens driving apparatus according to claim 14 , wherein the stator comprises:
a magnet unit disposed at a position corresponding to the coil; a housing holding the magnet unit; and a base supporting the mover and the housing.

20 . A camera module comprising:
a lens driving apparatus according to claim 1 ; and an image sensor.

Assignees

• Lg Innotek Co Ltd

Inventors

• Jung Tae Jin
• Min Sang Jun
• Lee Sung Guk

Classifications

• G02B7/08

  adapted to co-operate with a remote control mechanism · 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

• H02K41/0356

  moving along a straight path · CPC title

• G03B3/10

  Power-operated focusing · CPC title

• G03B5/00 Primary

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