Lens Moving Apparatus, Camera Module and Mobile Device Including the Same

• US 20160277684A1
• Filed: 03/21/2016
• Published: 09/22/2016
• Est. Priority Date: 03/19/2015
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Tae Bong, Han, Jin Suk, Kim, Jung Cheol
• Granted Patent: US 10,057,493 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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: G02B 7/023 permitting adjustment
• CPC Class Codes: G02B 7/04 with mechanism for focusing or varying magnification
• CPC Class Codes: G03B 2205/0007 Movement of one or more optical elements for control of motion blur
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/57 Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
• CPC Class Codes: H04N 23/63 by using electronic viewfinders
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/683 performed by a processor, e.g. controlling the readout of an image memory
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

Embodiments provide a lens moving apparatus including a bobbin having a lens barrel, a housing configured to accommodate the bobbin, an upper elastic member coupled to the bobbin and the housing, a lower elastic member coupled to the bobbin and the housing, a first coil disposed on the bobbin, a first magnet disposed on the housing, a circuit board disposed below the housing, a second coil disposed on the circuit board, a first sensor to output a first output signal based on a sensed result of a magnetic field strength of the first magnet, a first capacitor connected in parallel to the first sensor.

Claims

1. A lens moving apparatus comprising:

a bobbin including a lens barrel;

a housing configured to accommodate the bobbin therein;

an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing;

a lower elastic member coupled to a lower portion of the bobbin and a lower portion of the housing;

a first coil disposed on the bobbin;

a first magnet disposed on the housing;

a circuit board disposed below the housing;

a second coil disposed on the circuit board;

a first sensor including first and second input terminals, to which a first input signal is input, and first and second output terminals, from which a first output signal is output based on a sensed result of a magnetic field strength of the first magnet;

a first capacitor connected in parallel to the first and second output terminals of the first sensor;

a second sensor including first and second input terminals, to which a second input signal is input, and first and second output terminals, from which a second output signal is output based on a sensed result of a magnetic field strength of the first magnet; and

a second capacitor connected in parallel to the first and second output terminals of the second sensor.

2. The lens moving apparatus according to claim 1, wherein the first and second sensors and the first and second capacitors are disposed on the circuit board.

3. The lens moving apparatus according to claim 2, wherein the first capacitor is connected to the first sensor and the second capacitor is connected to the second sensor via a wire formed on the circuit board.

4. The lens moving apparatus according to claim 1, wherein an output signal from either end of the first capacitor is a time-delayed signal of the output signal of the first sensor, and an output signal from either end of the second capacitor is a time-delayed signal of the output signal of the second sensor.

5. The lens moving apparatus according to claim 1, further comprising:

a base disposed below the circuit board; and

a support member disposed on a side portion of the housing and configured to support the housing so that the housing is spaced apart from the base.

6. The lens moving apparatus according to claim 5, wherein the first and second sensors and the first and second capacitors are located between the circuit board and the base.

7. The lens moving apparatus according to claim 6, wherein the base has first recesses configured to receive the first and second sensors and second recesses configured to receive the first and second capacitors, the first recesses and the second recesses being formed at an upper surface of the base.

8. The lens moving apparatus according to claim 1, wherein each of the first and second capacitors has a capacitance within a range from 0.1 μ

F to 1 μ

F.

9. The lens moving apparatus according to claim 1, wherein the first capacitor performs time-delay of the first output signal, and the second capacitor performs time-delay of the second output signal.

19. A camera module comprising:

the lens moving apparatus according to claim 1; and

an image sensor mounted on the lens moving apparatus.

20. A mobile device comprising:

a display module including a plurality of pixels, a color of which varies by an electrical signal;

the camera module according to claim 19, the camera module being configured to convert an image, introduced through a lens, into an electrical signal; and

a controller configured to control operations of the display module and the camera module.

10. A lens moving apparatus comprising:

a housing configured to support a first magnet;

a bobbin having a first coil provided on an outer surface thereof so as to be opposite to the first magnet, the bobbin being disposed inside the housing so as to move in a first direction;

a base disposed below the bobbin and spaced apart from the bobbin by a given distance;

a second coil disposed above the base and below the housing; and

a support member disposed on a side surface of the housing and configured to support the bobbin and the housing so that the bobbin and the housing are movable in a second direction and a third direction, which are perpendicular to the first direction,

wherein the support member is coupled at an upper side thereof to an upper side of the housing, and is coupled at a lower side thereof to the base, and a portion of the support member is fixed to a lower portion of the side surface of the housing.

11. The lens moving apparatus according to claim 10, wherein the support member includes a first fixing portion fixed to the lower portion of the side surface of the housing, and

wherein a first distance, which is a distance from an upper surface of the second coil to a lower end of the first fixing portion in the first direction, is smaller than a first length of the first magnet in the first direction.

12. The lens moving apparatus according to claim 11, wherein the support member includes:

a first coupling portion coupled to the upper side of the housing;

a second coupling portion coupled to the base;

a first connection portion extending from the first coupling portion; and

an elastic-deformation portion extending from the second coupling portion.

13. The lens moving apparatus according to claim 12, wherein one end of the first connection portion or the elastic-deformation portion is coupled to the first fixing portion.

14. The lens moving apparatus according to claim 12, wherein the elastic-deformation portion includes:

a first bent portion configured to protrude upward from the second coupling portion, the first bent portion having at least one bent region;

a second bent portion configured to protrude upward from the first fixing portion, the second bent portion having at least one bent region; and

a second connection portion configured to connect upper ends of the first bent portion and the second bent portion to each other.

15. The lens moving apparatus according to claim 12, wherein each of the first coupling portion, the first connection portion and the first fixing portion includes a pair of symmetrical portions.

16. The lens moving apparatus according to claim 12, wherein the elastic-deformation portion is deformed when the bobbin and the housing move in the second direction or the third direction, and elastically supports the bobbin and the housing.

17. The lens moving apparatus according to claim 11, wherein the first fixing portion is bonded to the lower portion of the side surface of the housing using an adhesive.

18. The lens moving apparatus according to claim 11, wherein the first magnet is located so as to be opposite to a curved portion of the side surface of the housing, and the support member is located so as to be opposite to a flat portion of the side surface of the housing.