Lens driving apparatus

• US 8,451,553 B2
• Filed: 10/22/2010
• Issued: 05/28/2013
• Est. Priority Date: 11/23/2006
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Kim, Ji Hoon
• Primary Examiner(s): Harrington, Alicia M
• Application Number:
  US12/910,293
• Publication Number:
  US 20110051264A1
• Time in Patent Office: 949 Days
• Field of Search: 359/822, 359/824, 359/817, 359/704
• US Class Current: 359/824
• CPC Class Codes: G02B 27/0006 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation G02B1/18 takes precedence; cleaning in general B08B
• CPC Class Codes: G02B 7/023 permitting adjustment
• CPC Class Codes: G02B 7/08 adapted to co-operate with a remote control mechanism
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: G11B 7/0933 Details of stationary parts
• CPC Class Codes: G11B 7/0935 Details of the moving parts
• CPC Class Codes: H02K 41/0356 moving along a straight path

Abstract

Disclosed is a lens driving apparatus. The lens driving apparatus includes a base, a yoke coupled to the base, having an upper surface formed with a hole, a closed side surface, and an opened bottom surface, a bobbin movably installed in an inner portion of the yoke, a lens module coupled to the bobbin to go in and out the hole according to movement of the bobbin, a magnet fixed to an inner portion of the yoke, a coil fixed to an outer portion of the bobbin while facing the magnets, and springs coupled to the bobbin to provide restoration force to the bobbin.

Claims

1. A lens driving apparatus comprising:

a base;

a yoke coupled to the base;

a bobbin movably disposed in an inner portion of the yoke;

magnets disposed in the yoke;

a coil fixed to an outer portion of the bobbin while facing the magnets; and

springs coupled to the bobbin to provide restoration force to the bobbin,

wherein the springs comprise an upper spring coupled to an upper portion of the bobbin and a lower spring coupled to a lower portion of the bobbin,

wherein the coil has an octagonal shape, and

wherein the upper spring has a first side, which is disposed between the yoke and the magnets, and a second side coupled to the bobbin.

2. The lens driving apparatus as claimed in claim 1, wherein the base has locking protrusions and the yoke has locking holes into which the locking protrusions are inserted.

3. The lens driving apparatus as claimed in claim 1, wherein side surfaces of the lens driving apparatus are closed by the base and the yoke.

4. The lens driving apparatus as claimed in claim 1, wherein the second side of the upper spring is inserted into first support protrusions formed at the upper portion of the bobbin.

5. The lens driving apparatus as claimed in claim 1, further comprising:

a lens module coupled to the bobbin to go in and out a hole of the yoke according to movement of the bobbin.

6. The lens driving apparatus as claimed in claim 1, wherein the yoke includes an upper surface formed with a hole, a closed side surface, and an opened bottom surface.

7. The lens driving apparatus as claimed in claim 1, wherein the magnet is fixed to an inner portion of the yoke.

8. The lens driving apparatus as claimed in claim 1, wherein the lower spring has one side integrally formed with the bobbin through injection molding.

9. The lens driving apparatus as claimed in claim 1, wherein a side surface of the bobbin has an octagonal shape.

10. A lens driving apparatus comprising:

a base;

a yoke coupled to the base;

a bobbin movably disposed in an inner portion of the yoke;

magnets disposed in the yoke;

a coil fixed to an outer portion of the bobbin while facing the magnets; and

springs coupled to the bobbin to provide restoration force to the bobbin,

wherein the springs comprise an upper spring coupled to an upper portion of the bobbin and a lower spring coupled to a lower portion of the bobbin,

wherein the yoke is disposed on an outermost surface of the lens driving apparatus, and

wherein the coil is overlapped with the yoke in a horizontal plane and wherein the coil is not overlapped with the yoke in a vertical plane.

11. The lens driving apparatus as claimed in claim 10, wherein a portion of the bobbin between an upper surface and a side surface of the bobbin is exposed to an outside.

12. The lens driving apparatus as claimed in claim 10, wherein the upper spring is disposed between the yoke and the magnets.