Driver for actuator and camera module and method thereof

Patent metadata

Field	Value
Publication number	US-2016269644-A1
Application number	US-201615067681-A
Country	US
Kind code	A1
Filing date	Mar 11, 2016
Priority date	Mar 13, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

A driver includes a position detector, a controller, a current applying unit, and a driver actuator. The position detector is configured to detect a position of a lens module. The controller is configured to control movement of the lens module based on information on a target position of the lens module included in an input signal and speed information generated based on the position of the lens module detected by the position detector. The current applying unit is configured to apply a current to move the lens module according to a control of the controller. The driver actuator is configured to drive the lens module according to the current from the current applying unit.

First claim

What is claimed is:

1 . A driver, comprising:
a position detector configured to detect a position of a lens module; a controller configured to control movement of the lens module based on information on a target position of the lens module included in an input signal and speed information generated based on the position of the lens module detected by the position detector; a current applying unit configured to apply a current to move the lens module according to a control of the controller; and a driver actuator configured to drive the lens module according to the current from the current applying unit.

2 . The driver of claim 1 , wherein the controller is further configured to
generate a first control signal based on the information on the target position, generate a second control signal based on the speed information, and control the current generated in response to the first control signal, or the first control signal and the second control signal.

3 . The driver of claim 2 , wherein the controller comprises
a position controller configured to generate the first control signal according to the information on the target position; a speed detector configured to detect movement speed of the lens module using the position detected by the position detector and generate the speed information; a speed controller configured to generate the second control signal according to the first control signal and the speed information; and a current controller configured to control the current generated based on the second control signal.

4 . The driver of claim 2 , wherein the controller includes
a position controller configured to generate the first control signal according to the information on the target position; a speed detector configured to detect movement speed of the lens module using the position detected and generate the speed information; a speed controller configured to generate the second control signal according to the speed information; and a current controller configured to control an amount of the current generated based on the first control signal and the second control signal.

5 . A driver, comprising:
controllers having different control characteristics to control a lens module; and a selector configured to select one of the controllers to control the movement of the lens module based on information about a target position of the lens module included in an input signal, and speed information generated based on a position of the lens module.

6 . The driver of claim 5 , wherein the selector selects one of the controllers based on one of a target position of the lens module, an attitude of a camera module, and an internal temperature of the camera module.

7 . The driver of claim 6 , wherein the selector selects one of the controllers based on one of a distance of movement up to the target position of the lens module, a difference of a distance between a previous position of the lens module and the target position thereof, an accumulated value of error between the target position of the lens module and an actual position thereof, the attitude of the camera module, and the internal temperature of the camera module.

8 . The driver of claim 7 , wherein the selector sets a hold flag to prevent a switching of the selection from a currently selected controller to another controller.

9 . The driver of claim 5 , further comprising:
a current applying unit configured to apply a current to move the lens module based on a control of the one of the controllers; a driver configured to receive the current to drive the lens module; and a position detector configured to detect the position of the lens module.

10 . The driver of claim 9 , wherein the controller generates a first control signal based on the information on the target position, generates a second control signal based on the speed information, and controls the current generated by the current applying unit in response to the first control signal or the first control signal and the second control signal.

11 . The driver of claim 10 , wherein the controller comprises
a position controller configured to generate the first control signal according to the information on the target position; a speed detector configured to detect movement speed of the lens module using the detected position and generate the speed information; a speed controller configured to generate the second control signal based on the first control signal and the speed information; and a current controller configured to control an amount of the current generated based on the second control signal.

12 . The driver of claim 10 , wherein the controller comprises
a position controller configured to generate the first control signal based on the information on the target position; a speed detector configured to detect movement speed of the lens module using the position of the lens module and generate the speed information; a speed controller configured to generate the second control signal based on the speed information; and a current controller configured to control an amount of the current generated by the current applying unit based on the first control signal and the second control signal.

13 . A camera module, comprising:
an actuator configured to move a lens module; and a driver configured to generate a current to drive the actuator based on information on a target position of the lens module included in an input signal and speed information generated based on a detected position of the lens module.

14 . The camera module of claim 13 , wherein the driver for an actuator includes
a controller configured to control a movement of the lens module based on the information on the target position and the speed information; a current applying unit configured to apply a current to move the lens module based on the control from the controller; and a position detector configured to detect a position of the lens module.

15 . The camera module of claim 14 , wherein the controller is configured to generate a first control signal based on the information on the target position, generate a second control signal based on the speed information, and control the current generated by the current applying unit in response to the first control signal or the first control signal and the second control signal.

16 . The camera module of claim 15 , wherein the controller includes
a position controller configured to generate the first control signal according to the information on the target position; a speed detector configured to detect movement speed of the lens module using the detected position and generate the speed information; a speed controller configured to generate the second control signal based on the first control signal and the speed information; and a current controller configured to control an amount of the current generated based on the second control signal.

17 . The camera module of claim 15 , wherein the controller includes
a position controller configured to generate the first control signal according to the information on the target position; a speed detector configured to detect a movement speed of the lens module using the detected position and generate the speed information; a speed controller configured to generate the second control signal according to the speed information; and a current controller to control an amount of the current generated based on the first control signal and the second control signal.

18 . The camera module of claim 13 ,

Assignees

• Samsung Electro Mech

Inventors

• Cheong Shin Young

Classifications

• G02B7/028

  with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation · CPC title

• G02B27/646

  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 title

• G02B7/08 Primary

  adapted to co-operate with a remote control mechanism · CPC title

• H04N23/60

  Control of cameras or camera modules · CPC title

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title