Method of manufacturing camera module

Abstract

A method of manufacturing a camera module that includes a housing having an inner space, a frame disposed in the inner space of the housing and configured to accommodate a lens barrel therein, and optical image stabilization driving wires including driving wires driving the frame in a direction perpendicular to an optical axis. The method includes fixing both end portions of a target driving wire, among the driving wires, to a first inner side surface of the housing, disposing the frame adjacent a second inner side surface of the housing that opposes the first inner side surface, and coupling a center part of the target driving wire to a mounting member of the frame that faces the first inner side surface of the housing.

What is claimed is: 
     
         1 . A method of manufacturing a camera module which includes a housing having an inner space, a frame disposed in the inner space of the housing and accommodating a lens barrel, and driving wires configured to drive the frame in a direction perpendicular to an optical axis, the method comprising:
 fixing a first target driving wire, among the driving wires, to the housing;   coupling the first target driving wire to the frame positioned on a first position;   fixing a second target driving wire, among the driving wires, to the housing; and   coupling the second target driving wire to the frame positioned on a second position different from the first position.   
     
     
         2 . The method of manufacturing a camera module of  claim 1 , wherein the first target driving wire is coupled to the frame in a relaxed state, and
 the second target driving wire is coupled to the frame in a relaxed state.   
     
     
         3 . The method of manufacturing a camera module of  claim 1 , wherein both end portions of the first target driving wire are fixed at corners formed by a first inner side surface of the housing, and
 both end portions of the second target driving wire are fixed at corners formed by a second inner side surface of the housing.   
     
     
         4 . The method of manufacturing a camera module of  claim 1 , wherein the frame is disposed in a center of the housing in a direction perpendicular to driving forces produced by the first and second target driving wires. 
     
     
         5 . The method of manufacturing a camera module of  claim 1 , wherein the housing comprises:
 a first mounting member coupled to the first target driving wire and facing a first inner surface of the housing; and   a second mounting member coupled to the second target driving wire and facing a second inner surface of the housing.   
     
     
         6 . The method of manufacturing a camera module of  claim 1 , further comprising:
 moving the frame from the first position to the second position.   
     
     
         7 . The method of manufacturing a camera module of  claim 1 , wherein a first angle formed at a center part by both end portions of the first target driving wire while the frame is positioned on the first position is identical to a second angle formed at a center part by both end portions of the second target driving wire while the frame is positioned on the second position. 
     
     
         8 . The method of manufacturing a camera module of  claim 1 , wherein the driving wires include a first driving wire on the first inner side surface of the housing, a second driving wire facing the first driving wire, a third driving wire on a third inner side surface of the housing that is adjacent to the first inner side surface, and a fourth driving wire facing the third driving wire. 
     
     
         9 . The method of manufacturing a camera module of  claim 1 , wherein the housing comprises fixing connectors extending upwardly from corners of the housing, and each of the driving wires is fixed to two adjacent fixing connectors. 
     
     
         10 . The method of manufacturing a camera module of  claim 9 , wherein the fixing connectors comprise:
 first connectors connected to the first target driving wire; and   second connectors connected to the second target driving wire,   wherein a minimum length of the first target driving wire is longer than a distance between the first fixing connectors, and   a minimum length of the second target driving wire is longer than a distance between the second fixing connectors.   
     
     
         11 . The method of manufacturing a camera module of  claim 1 , wherein each of lengths of the first and second target driving wires in a most contracted state is longer than a distance between adjacent corners of the housing. 
     
     
         12 . The method of manufacturing a camera module of  claim 1 , wherein each of the driving wires is formed of a shape memory alloy. 
     
     
         13 . The method of manufacturing a camera module of  claim 1 , further comprising:
 applying a correction coefficient to at least one of driving signals for reducing an offset between the driving signals, and   wherein the driving signals are configured to drive the frame in a direction perpendicular to the optical axis.   
     
     
         14 . The method of manufacturing a camera module of  claim 13 , wherein the offset corresponds to a difference value between slopes of digital values according to the driving signals. 
     
     
         15 . The method of manufacturing a camera module of  claim 14 , wherein each of the slopes corresponds to a difference value between a maximum value and a minimum value of a respective digital value of the digital values. 
     
     
         16 . The method of manufacturing a camera module of  claim 15 , wherein the maximum value corresponds to a maximum duty of a respective driving signal of the driving signals, and
 wherein the minimum value corresponds to a minimum duty of a respective driving signal of the driving signals.   
     
     
         17 . The method of manufacturing a camera module of  claim 14 , wherein the correction coefficient is based on a respective slope of the slopes and a reference slope. 
     
     
         18 . The method of manufacturing a camera module of  claim 14 , wherein the digital values are based on thermal resistances of the driving wires according to the driving signals.