# US 12,001,009 B2 · Camera module comprising a liquid lens and performing optical image stabilization

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- Number: US 12,001,009 B2
- Document ID: US12001009B2
- Status: Granted
- Kind: B2
- Application number: 17/753,962
- Filed: 2020-09-17
- Published: 2022-10-20
- Granted: 2024-06-04
- Earliest claimed: 2019-09-18
- Assignees: LG Innotek Co., Ltd.
- Applicants: LG Innotek Co., Ltd.
- Inventors: Hoon Kim
- Web page: https://patentgrep.com/patent/US12001009B2

## CPC

- G02B 26/004: {based on a displacement or a deformation of a fluid}
- H04N 23/57: Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
- G02B 3/14: of variable focal length
- G02B 7/021: {for more than one lens}
- G02B 13/0075: {having an element with variable optical properties}
- 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)}
- G03B 17/55: with provision for heating or cooling, e.g. in aircraft
- H04N 23/6812: {based on additional sensors, e.g. acceleration sensors}
- H04N 23/682: {Vibration or motion blur correction}
- H04N 23/685: {performed by mechanical compensation}
- H04N 23/54: Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
- H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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)

## Abstract

Disclosed is a camera module comprising: a lens assembly including a liquid lens; an image sensor for receiving light that has passed through the lens assembly; a detecting sensor for detecting the movement of the lens assembly to generate a motion signal; a voltage controller for generating a driving signal to control an interface of the liquid lens in response to the motion signal; a detecting unit for outputting a motion frequency from the motion signal; and a driving unit for changing an image-capture timing of the image sensor according to the motion frequency.

## Claims

### Claim 1

A camera module comprising:
a lens assembly including a liquid lens;
an image sensor that receives light passing through the lens assembly;
a detection sensor that detects a motion of the lens assembly to generate a motion signal;
a voltage controller that generates a driving signal for adjusting an interface of the liquid lens in response to the motion signal;
a detection unit that outputs a motion frequency from the motion signal; and
a driving unit that changes an imaging timing of the image sensor according to the motion frequency,
wherein, when the motion frequency increases, the driving unit moves the image timing from a minimum value of the motion signal to an extreme value of the motion signal.

### Claim 2 (depends on 1)

The camera module of claim 1, wherein the interface of the liquid lens is periodically changed according to the motion frequency.

### Claim 3 (depends on 1)

The camera module of claim 1, wherein, when the motion frequency decreases, the driving unit moves the imaging timing from an extreme value of the motion signal to a minimum value of the motion signal.

### Claim 4 (depends on 3)

The camera module of claim 3, wherein the driving unit moves the imaging timing to a point at which an inclination of the motion signal is maximum.

### Claim 5 (depends on 1)

The camera module of claim 1, wherein the motion frequency is greater than a frequency of a wavefront error for the interface of the liquid lens.

### Claim 6 (depends on 5)

The camera module of claim 5, wherein a magnitude of the wavefront error has a constant number or section during one period even when the frequency of the motion signal is changed.

### Claim 7 (depends on 1)

The camera module of claim 1, wherein the image sensor performs imaging at the imaging timing.

### Claim 8 (depends on 1)

The camera module of claim 1, wherein the interface of the liquid lens is changed by the driving signal.

### Claim 9 (depends on 2)

The camera module of claim 2, wherein a wavefront error for the interface of the liquid lens is changed according to a magnitude of the motion frequency.