Adjusting method of camera module, lens position control device, control device of linear movement device, and controlling method of the same

Patent metadata

Field	Value
Publication number	US-2016295099-A1
Application number	US-201415037410-A
Country	US
Kind code	A1
Filing date	Nov 28, 2014
Priority date	Dec 4, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

An adjusting method of a camera module, a lens position control device, a control device of a linear movement device, and a controlling method of the same are provided in a state of the cameral module in which an imaging element and an actuator are combined. The camera module includes a position sensor ( 53 ) that detects a position of a lens ( 50 ) to output a detection position signal, a storage unit ( 541 ) that stores and rewrites a position code value corresponding to the position of the lens, a target position signal generation unit ( 542 ) that outputs a target position signal based on the position code value and the target position code value, and a control unit ( 543 ) that generates a control signal based on the target position signal and the detection position signal.

First claim

1 . An adjusting method of a camera module, the camera module comprising a lens, an imaging element that outputs an image signal of an object; a signal processing circuit that outputs a target position code value of the lens from the image signal; a position sensor that detects a position of the lens and outputting a detection position signal; a lens position control circuit comprising a storage unit that stores a position code value corresponding to the position of the lens to be capable of rewriting the position code value, a target position signal generation unit that outputs a target position signal based on the position code value and the target position code value, and a control unit that generates a control signal based on the target position signal and the detection position signal; and a drive unit that moves the lens based on the control signal,
the adjusting method comprising: a first step of moving the lens to a first lens position to focus on the object located at a first position for a first focus distance; and a second step of rewriting the position code value stored in the storage unit to another position code value such that a moving range of the lens is limited based on the first focus distance.

2 . The adjusting method of the camera module according to claim 1 , further comprising a third step of moving the lens to a second lens position to focus on the object located at a second position for a second focus distance,
wherein the second step comprises rewriting the position code value stored in the storage unit to the another position code value such that the moving range of the lens is limited based on the first focus distance and the second focus distance.

3 . The adjusting method of the camera module according to claim 2 , wherein the second step comprises rewriting the position code value stored in the storage unit to the another position code value corresponding to a plurality of the positions between the first lens position and the second lens position.

4 . The adjusting method of the camera module according to claim 1 , wherein the second step comprises rewriting the position code value stored in the storage unit to the another position code value such that the lens moves between the first position for a proximate focus distance and the second position for an infinite focus distance.

5 . The adjusting method of the camera module according to claim 2 ,
wherein the first focus distance is a proximate focus and the second focus distance is an infinite focus, and wherein the second step comprises rewriting the position code value stored in the storage unit to another position code value such that the lens moves between a plurality of the positions between the first lens position and the second lens position.

6 . The adjusting method of the camera module according to claim 1 ,
wherein the position code value comprises a conversion code to convert the target position code to the target position signal, and the second step comprises rewriting the conversion code stored in the storage unit is rewritten to limit the moving range of the lens, or wherein the position code value comprises a matrix to convert the target position code to the target position signal, and the second step comprises rewriting the matrix stored in the storage unit to limit the moving range of the lens.

7 . The adjusting method of the camera module according to claim 1 , wherein the position code value stored in the storage unit beforehand is a position code value corresponding to the position of the lens that moves from one end of a movable range of the lens to another end in the camera module.

8 . An adjusting method of a camera module, the camera module comprising:
a lens; an imaging element outputting an image signal of an object; a conversion unit converting the image signal with a conversion factor into a target position signal that moves the lens to a target position; a position sensor detecting a position of the lens and outputting a detection position signal; a control unit generating a control signal based on the target position signal and the detection position signal; a drive unit moving the lens based on the control signal; and a storage unit storing the conversion factor that can be rewritten, the adjusting method comprising: a first step of moving the lens to a first lens position to focus on the object located at a first position for a first focus distance; a second step of moving the lens to a second lens position to focus on the object located at a second position for a second focus distance; and rewriting the conversion factor stored in the storage unit to limit a moving range of the lens based on the first focus distance and the second focus distance.

9 . An adjusting method of a camera module, the camera module comprising:
a lens; an imaging element outputting an image signal of an object; a signal processing circuit outputting a target position code value of the lens from the image signal; a position sensor detecting a position of the lens and outputting a detection position signal; an adjustment unit adjusting the detection position signal with an adjustment signal that is rewritable and outputting an adjusted detection position signal; a lens position control circuit comprising a target position signal generation unit outputting a target position signal based on the target position code value, and a control unit generating a control signal based on the target position signal and the adjusted detection position signal; and a drive unit moving the lens based on the control signal, the adjusting method comprising: a first step of moving the lens to a first lens position to focus on the object located at a first position of a first focus distance; a second step of moving the lens to a second lens position to focus on the object located at a second position for a second focus distance; and a third step of rewriting the adjustment signal of the adjustment unit to limit a moving range of the lens based on the first focus distance and the second focus distance.

10 . The adjusting method of the camera module according to claim 9 , wherein the adjustment signal stored in the storage unit beforehand adjusts the detection position signal such that the lens moves from one end of a movable range of the lens to another end in the camera module.

11 . A lens position control device, comprising:
a position sensor configured to detect a position of a lens, and to output a detection position signal; a storage unit configured to store a position code value corresponding to the position of the lens, the position code value being rewritable; a target position signal generation unit configured to output a target position signal based on the position code value and a target position code value representing a target position of the lens, and a control unit configured to generate a control signal to move the position of the lens based on the target position signal and the detection position signal.

12 . The lens position control device according to claim 11 , wherein the position code value converts the target position code value into the target position signal such that the lens moves between a first position of a proximate focus distance and a second position of an infinite focus distance.

13 . The lens position control device according to claim 12 , further comprising a position code setting unit configured to set the position code value,
wherein the position code setting unit resets the position code value stored in the storage unit beforehand to another position code value.

14 . A control devi

Assignees

• Asahi Kasei Microdevices Corp

Inventors

• Kasamatsu Arata
• Isogai Kazuomi

Classifications

• H04N23/57

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

• H04N23/673 Primary

  based on contrast or high frequency components of image signals, e.g. hill climbing method · CPC title

• H04N5/2257

  Electricity · mapped topic

• G02B7/09

  adapted for automatic focusing or varying magnification · CPC title

• H04N5/23212 Primary

  Electricity · mapped topic