Lens moving apparatus and camera module and portable terminal including the same

Patent metadata

Field	Value
Publication number	US-9955086-B2
Application number	US-201615137549-A
Country	US
Kind code	B2
Filing date	Apr 25, 2016
Priority date	Apr 24, 2015
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

Embodiments provide a lens moving apparatus including a housing supporting a magnet, a bobbin having an outer circumferential surface on which a first coil is disposed, the bobbin moving in the housing in a first direction, upper and lower elastic members each connected to both the housing and the bobbin, and a second coil disposed so as to be spaced apart from the first coil in the first direction, wherein the second coil generates induction voltage resulting from inductive interaction with the first coil when the bobbin moves in the first direction.

First claim

What is claimed is:

1. A lens moving apparatus comprising:
a housing;
a bobbin disposed in the housing and configured to move in a first direction along an optical axis;
a first coil comprising a first ring disposed on an outer circumferential surface of the bobbin;
a magnet disposed on the housing and facing the first coil;
an upper elastic member connected to an upper portion of the bobbin;
a lower elastic member connected to a lower portion of the bobbin;
a second coil comprising a second ring disposed on an outer side surface of the housing and disposed above the first coil so as to be spaced apart from the first coil in the first direction; and
a third coil disposed below the housing;
wherein the second ring of the second coil is not overlapped with the first ring of the first coil in a second direction perpendicular to the first direction,
wherein the bobbin is configured to move in the first direction via electromagnetic interaction between the first coil and the magnet,
wherein a distance in the first direction between the first coil and the second coil is configured to vary as the first coil and the bobbin move in the first direction, and
wherein an induction voltage is generated based on the distance in the first direction between the first coil and the second coil when the first coil and the bobbin move in the first direction.

2. The lens moving apparatus according to claim 1 , wherein the second ring of the second coil is disposed on an upper portion of the housing and, wherein the second coil is not overlapped with the first coil in the first direction.

3. The lens moving apparatus according to claim 1 , wherein the housing comprises a first seating portion formed on the outer side surface of the housing and recessed from the outer side surface of the housing, and wherein the second ring of the second coil is disposed in the first seating portion.

4. The lens moving apparatus according to claim 1 , wherein the second coil has a closed loop surrounding the outer side surface of the housing.

5. The lens moving apparatus according to claim 1 , wherein the second coil is disposed above the magnet, and the third coil is disposed below the magnet; and
wherein the first ring of the first coil has an octagonal shape, and the second ring of the second coil has an polygonal shape.

6. The lens moving apparatus according to claim 1 , further comprising four support members disposed on four corners of the housing, respectively,
wherein the upper elastic member comprises four upper elastic member segments separated from each other,
wherein each of the four upper elastic member segments comprises an inner frame coupled to the bobbin, an outer frame coupled to the housing, and a connection portion connecting the inner frame to the outer frame;
wherein the lower elastic member comprises an inner frame coupled to the bobbin, an outer frame coupled to the housing, and a connection portion connecting the inner frame to the outer frame; and
wherein the four support members are electrically connected to the outer frame of the four upper elastic member segments, respectively.

7. The lens moving apparatus according to claim 1 , wherein the first coil further comprises two ends extending from the first ring of the first coil,
wherein the second coil further comprises two ends extending from the second ring of the second coil, and
wherein the two ends of the first coil and the two ends of the second coil are electrically connected to the upper elastic member.

8. The lens moving apparatus according to claim 7 , further comprising a circuit board disposed under the third coil,
wherein two of the four support members are through the upper elastic member electrically connected to two ends of the first coil, and the remaining two support members are through the upper elastic member electrically connected to two ends of the second coil such that the first coil and the second coil are electrically connected to the circuit board; and
wherein each of the four support members is a suspension wire, and the second coil is located outside the four support members.

9. The lens moving apparatus according to claim 6 , wherein one end of each of the four support members is electrically connected to the circuit board through a through hole of the circuit board and the other end of each of the four support members is electrically connected to the upper elastic member through a through hole of the upper elastic member.

10. The lens moving apparatus according to claim 8 , further comprising a base under the circuit board, a cover member coupled to the base, and two hall sensors disposed on a lower surface of the circuit board;
wherein the two hall sensors are disposed in two grooves formed at the base, respectively,
wherein the circuit board comprises a plurality of terminals to supply current to the first coil and the third coil,
wherein the housing comprises an upper frame support protrusion protruding from an upper surface of the housing and a lower frame support protrusion protruding from an lower surface of the housing, and
wherein the outer frame of the upper elastic member comprises a through hole coupled to the upper frame support protrusion, and the outer frame of the lower elastic member comprises a through hole coupled to the lower frame support protrusion.

11. The lens moving apparatus according to claim 1 , wherein the first coil is configured to move the bobbin upward and downward from an initial position via electromagnetic interaction with the magnet,
wherein the second coil is configured to detect displacement of the bobbin when the bobbin moves in the first direction, and
wherein the third coil is configured to move the housing in the second direction and/or a third direction perpendicular to the first direction and the second direction via electromagnetic interaction with the magnet.

12. The lens moving apparatus according to claim 1 , wherein the third coil comprises a circuit member and four coils installed on four corners, respectively, of the circuit member.

13. The lens moving apparatus according to claim 10 , wherein the circuit board comprises a bent terminal surface, and the plurality of terminals are disposed on the bent terminal surface.

14. The lens moving apparatus according to claim 1 , wherein a driving signal is applied to the first coil, and the driving signal comprises a pulse width modulation (PWM) signal and/or a DC signal.

15. A camera module comprising:
a lens moving apparatus according to claim 1 ;
a lens barrel coupled to the bobbin, and
an image sensor mounted on the lens moving apparatus.

16. The camera module according to claim 15 , wherein a driving signal is applied to the first coil of the lens moving apparatus, and the driving signal comprises an AC signal.

17. The camera module according to claim 15 , wherein a driving signal is applied to the first coil of the lens moving apparatus, and the driving signal comprises a pulse width modulation (PWM) signal and/or a DC signal.

18. A phone comprising:
a camera module according to claim 15 ; and
a controller,
wherein the controller is configured to control a driving signal supplied to the first coil based on the induction voltage induced to the second coil.

19. The phone according to claim 18 , further comprising a display module including a plurality of pixels, the plurality of pixels exhibiting colors that vary in response to an electrical signal,
wherein the controller is configured to control operation of the display modules

Assignees

• Lg Innotek Co Ltd

Inventors

• Park Sang Ok

Classifications

• H04N23/55

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

• H04N23/51

  Housings · CPC title

• H04N23/57 Primary

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• H04N23/75 Primary

  by influencing optical camera components · CPC title

• G02B7/08 Primary

  adapted to co-operate with a remote control mechanism · CPC title