LENS HOLDER DRIVING APPARATUS

• US 20150160471A1
• Filed: 04/11/2014
• Published: 06/11/2015
• Est. Priority Date: 12/06/2013
• Status: Active Grant

• Current Assignee: AAC Optics Company Limited (AAC Technologies Holdings Inc.)
• Original Assignee: AAC Acoustic Technologies (Shenzhen) Co., Ltd. (AAC Technologies Holdings Inc.)
• Inventors: Zhou, Shi, Dong, Leping
• Granted Patent: US 9,575,285 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• 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 7/08 adapted to co-operate with a remote control mechanism

Abstract

A lens holder driving apparatus is disclosed. The lens holder driving apparatus includes a housing, an auto-focusing lens holder driving portion and a fixed portion. The auto-focusing lens holder driving portion includes an octagonal lens holder with a focusing coil, a positioning magnet mounted on the lens holder, a magnet holder with a magnet group including a bracket having a sidewall, a pillar projecting at the four corners of the sidewall of the bracket, and a first notch disposed at the pillar face to the focusing coil. The fixed portion includes a base having a sidewall, a FPC mounted on the sidewall of the base and a Hall element electrically connecting with the FPC inserted into the first notch for detecting the position of the positioning magnet so as to adjust the position of the lens holder.

Claims

1. An lens holder driving apparatus, comprising:

an auto-focusing lens holder driving portion defining a lens holder having of a substantial octagonal tube along an optical axis, a ring-shaped focusing coil entwining the lens holder, a positioning magnet, a magnet holder for holding a magnet group disposed opposite to the focusing at the outside of the focusing coil, a first and second springs respectively mounted on lower and upper ends of the magnet holder for supporting the lens holder;

a fixed portion defining a ring-shaped base having four sidewalls, a FPC mounted with the sidewall of the base for electrically connecting the first spring and a Hall element;

the lens holder defining an outer tubular portion having a circular tubular shape, an octagonal ring-shaped end portion extending vertically from a lower end of the outer tubular portion, and a positioning portion provided at the four corners of the octagonal ring-shaped end portion for supporting the outer tubular portion for restricting the positioning magnet in proper position;

the magnet holder defining a lower bracket disposed on the base, a upper base supporting by the lower bracket corporately forming a chamber accommodating the lens holder, the focusing coil and the positioning magnet therein, the lower bracket defining a sidewall and four pillars projecting at the four corners of the sidewalls and a receiving space formed between two adjacent pillars for receiving the magnet group, a first notch arranged on the pillar face to the focusing coil;

the FPC defining a first segment mounted on the sidewall of the base, a second segment extending from the first segment and a third segment extending vertically from the second segment along a direction parallel to the optical axis into the first notch of the lower bracket;

the Hall element mounted on the third segment of the FPC face to the positioning magnet over the focusing coil for detecting the position of the positioning magnet so as to adjust the position of the lens holder.

2. The lens holder driving apparatus as described in claim 1, wherein the positioning portion of the lens holder defines a first positioning end, a second positioning end opposite to the first positioning end, and a gap formed between the first positioning end and the second positioning end for receiving the positioning magnet.

3. The lens holder driving apparatus as described in claim 2, wherein the focusing coil has an octagonal cylindrical shape which coincides with an outer shape of the lens holder having the octagonal tubular shape.

4. The lens holder driving apparatus as described in claim 1, wherein the sidewall of the base further includes two positioning protrusions projecting outwards on the surface of the sidewall and a nick formed between the two positioning protrusions for fixing the first segment of the FPC.

5. The lens holder driving apparatus as described in claim 4, wherein the second segment extends vertically from an end of the first segment along a direction perpendicularly to the optical axis.

6. The lens holder driving apparatus as described in claim 5, wherein the second segment of the FPC is sandwiched between the lower bracket and the base.

7. The lens holder driving apparatus as described in claim 6, wherein the FPC further includes a fourth segment extending from the first segment of the FPC serving as an electrode for electrically connecting the first spring.

8. The lens holder driving apparatus as described in claim 7, wherein each of the first and the second springs defines an outer circuit portion mounted on the magnet holder, an inner circuit portion mounted on the lens holder, and a plurality of arms disposed between the outer circuit portion and the inner circuit portion.