# US 12,181,726 B2 · Anti-twist structure of voice coil motor

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- Number: US 12,181,726 B2
- Document ID: US12181726B2
- Status: Granted
- Kind: B2
- Application number: 17/326,682
- Filed: 2021-05-21
- Published: 2021-09-09
- Granted: 2024-12-31
- Earliest claimed: 2020-12-18
- Assignees: Lanto Electronic Limited
- Applicants: Lanto Electronic Limited
- Inventors: Wen-Yen Huang; Meng-Ting Lin; Fu-Yuan Wu; Shang-Yu Hsu; Bing-Bing Ma; Jie Du
- Web page: https://patentgrep.com/patent/US12181726B2

## CPC

- G02B 7/003: {Alignment of optical elements (G02B7/001, G02B7/002 take precedence; for mirrors G02B7/1822)}
- H02K 41/0354: {Lorentz force motors, e.g. voice coil motors}
- G02B 7/08: adapted to co-operate with a remote control mechanism
- G02B 7/09: adapted for automatic focusing or varying magnification
- G03B 3/10: Power-operated focusing
- G03B 30/00: Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
- H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof
- G02B 7/026: {using retaining rings or springs (G02B7/027 takes precedence)}
- G03B 2205/0069: using electromagnetic actuators, e.g. voice coils
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An anti-twist structure of voice coil motor includes a base, a lens housing, an elastic sheet, a magnet, and a yoke member. The lens housing has a margin wall, and the margin wall has a first protrusion and a contact portion. The elastic sheet has a hollowed slot, and the first protrusion pass through the hollowed slot, so that the elastic sheet is disposed on a portion of the margin wall and on the contact portion. The yoke member has an upper wall and a side wall. The side wall is disposed at one side of the upper wall and the side wall extends outward in a direction not parallel to the upper wall. The yoke member surrounds the lens housing, the elastic sheet, and the magnet. The lens housing has a deflectable angle relative to a horizontal reference line.

## Claims

### Claim 1

An anti-twist structure of voice coil motor, comprising:
a base;
a lens housing connected to the base, wherein the lens housing has a margin wall and an inner flange, and the margin wall has a first protrusion, a second protrusion, and a contact portion, wherein the contact portion is extended outwardly from an outer periphery of the first protrusion, a groove is disposed between the inner flange and the first protrusion, and the second protrusion is protruded from the contact portion, and a height of the second protrusion is lower than a height of the first protrusion, wherein the first protrusion and the second protrusion are protruded along an axial direction substantially perpendicular to the margin wall;
an elastic sheet having a hollowed slot, wherein the first protrusion passes through the hollowed slot so that the elastic sheet is disposed on a portion of the margin wall and on the contact portion, wherein elastic sheet comprises a first extension arm in the hollow slot, and the first extension arm is disposed in the groove;
a magnet disposed on the base and located at one side of the lens housing, wherein the magnet is connected to the elastic sheet; and
a yoke member having an upper wall and a side wall, wherein the side wall is disposed at one side of the upper wall and the side wall extends outward in a direction not parallel to the upper wall, and wherein the yoke member is connected to the base so that the yoke member surrounds the lens housing, the elastic sheet, and the magnet;
wherein the lens housing has a deflectable angle relative to a horizontal reference line, and the deflectable angle is an included angle between the lens housing and the horizontal reference line; and
wherein when the lens housing deflects from the horizontal reference line to a maximum value of the deflectable angle, a top surface of the first protrusion abuts against a bottom surface of the upper wall, and the contact portion abuts against the elastic sheet or the bottom surface of the upper wall at the same time, whereby the lens housing and the yoke member interfere with each other, and wherein when the lens housing deflects to the maximum value of the deflectable angle, the second protrusion abuts against the elastic sheet.

### Claim 2 (depends on 1)

The anti-twist structure of voice coil motor according to claim 1, wherein the deflectable angle is not greater than 2.7 degrees.