Patent Abstract:
Provided is an optical unit comprising a shake detecting sensor which is less likely to unnecessarily vibrate even with the optical unit being designed to have a thinner profile. At a first step in the assembly of an optical unit provided with a shake correction mechanism, a module cover is mounted on a fixed body with a spring member therebetween and a movable module driving mechanism is provided between the module cover and the fixed body. At a second step, an image-capturing unit is inserted into the interior of the module cover by way of a fixed-body-side opening portion and a module-cover-side opening portion, and at a third step, a holding member is attached to a module cover.

Full Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This is a U.S. national stage of application No. PCT/JP2010/063167, filed on Apr. 8, 2010, 2010. Priority under 35 U.S.C. §119(a) and 35 U.S.C. §365(b) is claimed from Japanese Application No. 2009-186342, filed Aug. 11, 2009, the disclosure of which is also incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to an optical unit which is mounted on a cell phone with a camera or the like and its manufacturing method. 
     BACKGROUND 
     In recent years, a cell phone is structured as an optical device on which an optical unit for photographing is mounted. In the optical unit for photographing, in order to prevent disturbance of a photographed image due to a hand shake of a user, it has been proposed that a movable module provided with an optical element such as a lens is supported so as to be capable of being displaced with respect to a fixed body by a spring member and a movable module drive mechanism for correcting the hand shake is structured between the movable module and the fixed body for swinging the movable module (see Patent Literature 1). 
     Further, in the optical unit described in Patent Literature 1, the movable module includes an optical element unit provided with a lens and the like and a module cover holding the optical element unit and the module cover is formed with an opening part larger the optical element unit. According to this structure, after the module cover is supported by the fixed body through the spring member, the optical element unit is accommodated in the inside of the module cover and, after that, the optical element unit can be fixed in the inside of the module cover by an adhesive or welding. Therefore, the optical element unit provided with a lens and the like can be manufactured in a separated step from another mechanism. 
     [PTL 1] Japanese Patent Laid-Open No. 2007-41418 
     However, in the structure in which, after the optical element unit has been accommodated in the inside of the module cover, the optical element unit is fixed in the inside of the module cover by an adhesive or welding, the optical element unit inserted into the module cover is required to be held until the adhesion or the welding has been completed and thus considerable time and labor are required for assembling. Further, when the optical element unit is to be fixed in the inside of the module cover, the optical axis may be displaced. 
     The above-mentioned problems are not limited to the optical unit for photographing provided with the shake correction mechanism but are common to a general optical module in which the movable module is supported by the fixed body so as to be capable of being displaced. 
     SUMMARY 
     In view of the problems described above, at least an embodiment of the present invention provides an optical unit which is easily assembled and in which displacement of an optical axis is hard to occur even when the optical element unit may be manufactured in a separate step from a step for another mechanism, and to provide a manufacturing method for the optical unit. 
     In order to solve the problem, at least an embodiment of the present invention provides an optical unit with a shake correcting function including a fixed body, a movable module which holds an optical element, a spring member through which the movable module is supported by the fixed body so as to be capable of displacing, a shake detection sensor which detects a shake of the movable module, and a movable module drive mechanism for a shake correction which is provided between the movable module and the fixed body and which generates a magnetic drive force for relatively displacing the movable module with respect to the fixed body so as to cancel the shake on the basis of a detection result of the shake detection sensor. In a case that one side in an optical axis direction is a first direction and the other side is a second direction, the fixed body is provided with a fixed body side opening part which is larger than an optical element unit on a first direction side. In addition, the movable module includes the optical element unit which holds the optical element, a module cover which is supported by the fixed body so as to be capable of displacing through the spring member and is provided with a module cover side opening part larger than the optical element unit at a position superposed on the fixed body side opening part on the first direction side, a support part which supports an end part on a second direction side of the optical element unit, and a pressing member which supports an end part on the first direction side of the optical element unit. 
     Further, at least an embodiment of the present invention provides a manufacturing method for an optical unit with a shake correcting function, the optical unit including a fixed body, a movable module which holds an optical element, a spring member through which the movable module is supported by the fixed body so as to be capable of displacing, a shake detection sensor which detects a shake of the movable module, and a movable module drive mechanism for a shake correction which is provided between the movable module and the fixed body and which generates a magnetic drive force for relatively displacing the movable module with respect to the fixed body so as to cancel the shake on the basis of a detection result of the shake detection sensor. The manufacturing method includes, in a case that one side in an optical axis direction is a first direction and the other side is a second direction, previously providing the fixed body with a fixed body side opening part which is larger than an optical element unit on a first direction side, previously providing the movable module with the optical element unit which holds the optical element, a module cover which is supported by the fixed body so as to be capable of displacing through the spring member and is provided with a module cover side opening part larger than the optical element unit at a position superposed on the fixed body side opening part on the first direction side, a support part which supports an end part on a second direction side of the optical element unit, and a pressing member which supports an end part on the first direction side of the optical element unit. In addition, the manufacturing method includes a first step in which the module cover and the support part are mounted on the fixed body through the spring member and the movable module drive mechanism is provided between the module cover and the fixed body, a second step in which the optical element unit is inserted to an inner side of the module cover through the fixed body side opening part and the module cover side opening part, and a third step in which the pressing member is connected with the module cover. 
     In at least an embodiment of the present invention, the fixed body is provided with a fixed body side opening part which is opened in a first direction and the module cover is also provided with a module cover side opening part on the first direction side. Therefore, the module cover is mounted on the fixed body through the spring member and the movable module drive mechanism is provided between the module cover and the fixed body and, after that, the optical element unit can be inserted to an inner side of the module cover through the fixed body side opening part and the module cover side opening part. Accordingly, the optical element unit can be manufactured in a separate step from a step in which the module cover, the spring member, the movable module drive mechanism are attached to the fixed body. Therefore, different from a case that inspection is performed after all the members have been assembled, inspection can be performed during manufacturing. As a result, a loss caused by a defective product can be restrained. Further, the support part is provided on the second direction side with respect to the module cover and the pressing member is provided on the first direction side. Therefore, when the optical element unit is inserted in the inside of the module cover, the end part on the second side of the optical element unit is supported by the support part. Further, after the pressing member is attached, the end part on the first direction side of the optical element unit is supported by the pressing member. Therefore, different from a structure in which, after the optical element unit is accommodated in the inside of the module cover, the optical element unit is fixed to the inside of the module cover by adhesion, welding or the like, assembling is easily performed and displacement of the optical axis is hard to be occurred. Accordingly, the production efficiency and yield of the optical unit can be improved. In addition, after the optical element unit is mounted, only the optical element unit can be exchanged and, when the optical unit is to be manufactured, the optical element unit to be mounted can be easily changed to another optical element unit. 
     In at least an embodiment of the present invention, it is preferable that the module cover is provided with a tube-like shape body part which surrounds the optical element unit and a support plate part which is protruded toward the module cover side opening part from an end part on a second direction side of the tube-like shape body part as the support part. According to this structure, even when the support part is not structured of a separate member, the end part on the second direction side of the optical element unit is supported. 
     In at least an embodiment of the present invention, it may be adopted that the module cover is provided with a tube-like shape body part which surrounds the optical element unit, and the support part is a support member which is a separate member from the module cover and is provided on a second direction side with respect to the tube-like shape body part. 
     In at least an embodiment of the present invention, for example, the second direction is a direction to which an optical axis is extended in the optical element unit, and the first direction is an opposite direction to the side to which the optical axis is extended in the optical element unit. 
     In this case, it is preferable that the shake detection sensor is provided at a position which is not superposed on the optical element unit in the optical axis direction. According to this structure, in the optical element unit, even when the shake detection sensor is provided on the opposite side to the side where the optical axis is extended, the optical element unit can be inserted to the inner side of the module cover through the fixed body side opening part and the module cover side opening part. Therefore, the shake detection sensor is not required to be provided at a position superposed on the optical element unit on the second direction side after the optical element unit has been inserted to the inner side of the module cover and thus, the optical unit can be made relatively thin. 
     In at least an embodiment of the present invention, it may be structured that the first direction is a direction to which an optical axis is extended in the optical element unit, and the second direction is an opposite direction to the side to which the optical axis is extended in the optical element unit. 
     In this case, it is preferable that a connector member which is electrically connected with the optical element unit is disposed between the end part on the second direction side of the optical element unit and the support part. According to this structure, electric connection can be performed easily at the end part on the second direction side of the optical element unit. 
     In at least an embodiment of the present invention, it may be adopted that the optical element unit holds an imaging element as the optical element. Further, in at least an embodiment of the present invention, it may be adopted that the optical element unit holds an optical element drive mechanism for driving the optical element in the optical axis direction. 
     In at least an embodiment of the present invention, the module cover is mounted on the fixed body through the spring member and the movable module drive mechanism is provided between the module cover and the fixed body and, after that, the optical element unit can be inserted to an inner side of the module cover through the fixed body side opening part and the module cover side opening part. Therefore, the optical element unit can be manufactured in a separate step from a step in which the module cover, the spring member, the movable module drive mechanism are attached to the fixed body. Accordingly, different from a case that inspection is performed after all the members have been assembled, inspection can be performed during manufacturing. As a result, a loss caused by a defective product can be restrained. Further, when the optical element unit is inserted in the inside of the module cover, the end part on the second side of the optical element unit is supported by the support part and, after the pressing member has been attached, the end part on the first direction side of the optical element unit is supported by the pressing member. Therefore, different from a structure in which, after the optical element unit is accommodated in the inside of the module cover, the optical element unit is fixed to the inside of the module cover by adhesion, welding or the like, assembling is easily performed and displacement of the optical axis and the like are hard to be occurred. Accordingly, the production efficiency and yield of the optical unit can be improved. In addition, after the optical element unit is mounted, only the optical element unit can be exchanged and, when the optical unit is to be manufactured, the optical element unit to be mounted can be easily changed to another optical element unit. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       Embodiments will now be described, by way of example only, with reference to the accompanying drawings which are meant to be exemplary, not limiting, and wherein like elements are numbered alike in several Figures, in which: 
         FIGS. 1(   a ) and  1 ( b ) are explanatory views showing an optical unit for photographing in accordance with a first embodiment of the present invention. 
         FIGS. 2(   a ),  2 ( b ) and  2 ( c ) are explanatory views showing a fixed body and a movable module of the optical unit in accordance with the first embodiment of the present invention. 
         FIG. 3  is an explanatory view showing a photographing unit which is incorporated into the movable module of the optical unit in accordance with the first embodiment of the present invention. 
         FIG. 4  is an exploded perspective view showing the movable module of the optical unit in accordance with the first embodiment of the present invention. 
         FIGS. 5(   a ) and  5 ( b ) are explanatory views showing a manufacturing method for the optical unit in accordance with the first embodiment of the present invention. 
         FIGS. 6(   a ) and  6 ( b ) are explanatory views showing a manufacturing method for the optical unit in accordance with the first embodiment of the present invention. 
         FIGS. 7(   a ) and  7 ( b ) are explanatory views showing an optical unit for photographing in accordance with a second embodiment of the present invention. 
         FIGS. 8(   a ),  8 ( b ) and  8 ( c ) are explanatory views showing a fixed body and a movable module of the optical unit in accordance with the second embodiment of the present invention. 
         FIGS. 9(   a ) and  9 ( b ) are explanatory views showing the movable module of the optical unit in accordance with the second embodiment of the present invention. 
         FIG. 10(   a ) through  10 ( d ) are explanatory views showing a manufacturing method for the optical unit in accordance with the second embodiment of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following descriptions, a structure for preventing a hand shake in a photographing unit will be described below as an example for an optical element unit. Further, in the following descriptions, three directions perpendicular to each other are set to be an X-axis, a Y-axis and a Z-axis, and a direction along an optical axis “L” (lens optical axis) is set to be the Z-axis. Therefore, in the following descriptions, a swing around the X-axis of shakes in the respective directions corresponds to a so-called pitching (vertical swing), a swing around the Y-axis corresponds to a so-called yawing (lateral swing), and a swing around the Z-axis corresponds to a so-called rolling. Further, “+X” is attached on one side in the X-axis, “−X” is attached on the other side, and “+Y” is attached on one side in the Y-axis, “−Y” is attached on the other side, and “+Z” is attached on one side (opposite side to an object side) in the Z-axis, and “−Z” is attached on the other side (object side). 
     First Embodiment 
     In this embodiment, after a module cover and the like have been mounted on a fixed body, a photographing unit (optical element unit) is inserted into a module cover from an opposite side to an object to be photographed (side to which an optical axis is extended). Therefore, in this embodiment, “first direction” and “second direction” are as follow: 
     First direction=an opposite direction to a side to which the optical axis is extended (opposite side to an object to be photographed). 
     Second direction=a direction to which the optical axis is extended (object side to be photographed). 
     (Entire Structure of Optical Device for Photographing) 
       FIGS. 1(   a ) and  1 ( b ) are explanatory views showing an optical unit for photographing in accordance with a first embodiment of the present invention.  FIG. 1(   a ) is a perspective view showing the optical unit which is viewed from an object side and  FIG. 1(   b ) is a perspective view showing the optical unit which is viewed from an opposite side to the object side.  FIGS. 2(   a ),  2 ( b ) and  2 ( c ) are explanatory views showing a fixed body and a movable module of the optical unit in accordance with the first embodiment of the present invention.  FIG. 2(   a ) is a perspective view showing a fixed body which is viewed from the opposite side to the object side,  FIG. 2(   b ) is a perspective view showing a movable module which is viewed from the opposite side to the object side, and  FIG. 2(   c ) is a perspective view showing the movable module which is viewed from the object side. In  FIG. 2(   a ), a fixed cover is not shown. 
     An optical unit  100  (optical unit with shake correcting function/photographic optical device) shown in  FIGS. 1(   a ) and  1 ( b ) and  FIGS. 2(   a ),  2 ( b ) and  2 ( c ) is a thin camera used in an optical device such as a cell phone with a camera. The optical unit  100  is formed in a roughly rectangular prism shape as a whole. The optical unit  100  is provided with a coil holding body  260 , a frame  270  which is fixed to the coil holding body  260  on an opposite side (“+Z”-axis direction) to an object side (“−Z”-axis direction), and a box-shaped fixed cover  230  which holds the coil holding body  260  and the frame  270  in its inner side. The fixed body  210  is structured of the coil holding body  260 , the frame  270  and the fixed cover  230 . A movable module  300  provided with a photographing unit  1  is disposed on an inner side of the fixed body  210  which is structured as described above. An upper plate part  231  located at an end part on the object side of the fixed cover  230  is formed with a rectangular window-shaped opening part  231   a . In this embodiment, a substantially all region superposed on the movable module  300  in an optical axis “L” direction is formed as the opening part  231   a . Further, an end part of the fixed cover  230  on the opposite side to the object side is formed to be an open end. 
     (Structure of Photographing Unit  1 ) 
       FIG. 3  is an explanatory view showing the photographing unit  1  (optical element unit) which is incorporated into the movable module  300  of the optical unit  100  in accordance with the first embodiment of the present invention. A left half portion in  FIG. 3  shows a view in which the movable body is located at an infinity position (normal photographing position) and a right half portion in  FIG. 3  shows a view in which the movable body is located at a macro-position (close-up photographing position). 
     As shown in  FIG. 3 , the photographing unit  1  is, for example, an optical element unit in which a plurality of lenses  10  as an optical element (see  FIG. 1(   a )) is moved in both directions, i.e., in an “A”-direction (front side) approaching an object to be photographed (object side) along the optical axis “L” direction and in a “B”-direction (rear side) approaching the opposite side (imaging element side/image side) to the object to be photographed. The photographing unit  1  is formed in a roughly rectangular prism shape. The photographing unit  1  is generally provided with the movable body  3  which holds optical elements such as a plurality of lenses  10  (see  FIG. 1(   a )) and a fixed diaphragm on its inner side, a lens drive mechanism  5  for moving the movable body  3  along the optical axis “L” direction, and a support body  2  on which the lens drive mechanism  5 , the movable body  3  and the like are mounted. The movable body  3  is provided with a lens holder  12 , which is formed in a cylindrical tube shape and holds the lenses and the fixed diaphragm, and a coil holder  13  which holds the lens holder  12  on its inner side. Lens drive coils  30   s  and  30   t  structuring the lens drive mechanism  5  are held on an outer peripheral side face of the coil holder  13 . 
     The support body  2  is provided with an imaging element holder  19 , which is formed in a rectangular plate shape and positions an imaging element  155  on the opposite side to the object side, a box-shaped case  18  which covers the imaging element holder  19  from the object side, and a spacer  11  which is formed in a rectangular plate shape and is disposed on an inner side of the case  18 . Circular incident windows  110  and  18   a  are respectively formed at centers of the case  18  and the spacer  11  for taking light from the object to be photographed to the lenses. Further, a window  19   a  for guiding the incident light to the imaging element  155  is formed at a center of the imaging element holder  19 . In the photographing unit  1 , the support body  2  is provided with a circuit board  151  on which the imaging element  155  is mounted and the circuit board  151  is fixed to an under face of the imaging element holder  19 . 
     The case  18  is made of a ferromagnetic plate such as a steel plate and also functions as a yoke. Therefore, the case  18  structures an interlinkage magnetic field generating body for generating interlinkage magnetic field in the lens drive coils  30   s  and  30   t  together with lens drive magnets  17  described below. The interlinkage magnetic field generating body structures the lens drive mechanism  5  together with the lens drive coils  30   s  and  30   t  which are wound around an outer peripheral face of the coil holder  13 . 
     The support body  2  and the movable body  3  are connected with each other through metal spring members  14   s  and  14   t  which are provided at positions separated in the optical axis “L” direction. Basic structures of the spring members  14   s  and  14   t  are similar to each other and they are provided with an outer peripheral side connecting part held by a support body  2  side, a ring-shaped inner peripheral side connecting part held by a movable body  3  side, and an arm-shaped plate spring part which connects the outer peripheral side connecting part with the inner peripheral side connecting part. The outer peripheral side connecting part of the spring member  14   s  on the imaging element  155  side is held by the imaging element holder  19  and its inner peripheral side connecting part is connected with an end face on the imaging element side of the coil holder  13  of the movable body  3 . The outer peripheral side connecting part of the spring member  14   t  on the object side is held by the spacer  11  and its inner peripheral side connecting part is connected with an end face on the object side of the coil holder  13  of the movable body  3 . In this manner, the movable body  3  is movably supported by the support body  2  in the optical axis “L” direction through the spring members  14   s  and  14   t . Each of the spring members  14   s  and  14   t  is made of nonmagnetic metal such as beryllium copper or SUS steel material and is formed by means of that a thin plate having a certain thickness is performed by press working or etching processing using photo lithography technique. The spring member  14   s  is divided into two pieces and respective coil ends of the lens drive coils  30   s  and  30   t  are respectively connected with the spring pieces. Further, the two spring pieces of the spring member  14   s  are respectively formed with a terminal and thus the spring member  14   s  functions as a power supply member to the lens drive coils  30   s  and  30   t.    
     A ring-shaped magnetic piece  61  is held on an object side end face of the coil holder  13  and the magnetic piece  61  is located at a position on the object side with respect to the lens drive magnet  17 . Therefore, the magnetic piece  61  applies an urging force in the optical axis “L” direction to the movable body  3  by an attraction force acted between the lens drive magnet  17  and the magnetic piece  61 . Therefore, at a non-energized time (home position), the lens holder  12  is maintained on an imaging element  155  side in a stationary state by an attraction force acted between the lens drive magnet  17  and the magnetic piece  61 . Further, the magnetic piece  61  acts as a yoke and thus leakage flux from a magnetic path which is structured between the lens drive magnets  17  and the lens drive coils  30   s  and  30   t  is reduced. As the magnetic piece  61 , a bar-shaped magnetic body or a spherical magnetic body may be used. In a case that the magnetic piece  61  is formed in a ring shape, it is effective that, when the lens holder  12  is to be moved in the optical axis “L” direction, magnetic attraction forces acted between the lens drive magnets  17  and the magnetic piece  61  become isotropic. In addition, when the lens drive coils  30   s  and  30   t  are energized, the magnetic piece  61  is moved in a direction separated from the lens drive magnets  17  and thus an unnecessary force that the lens holder  12  is pressed against the imaging element  155  side is not acted. Therefore, the lens holder  12  is moved in the optical axis “L” direction with a small electric power. 
     In the photographing unit  1  in this embodiment, when viewed in the direction of the optical axis “L”, the lens  10  (see  FIG. 1(   a )) is circular but the case  18  used in the support body  2  is in a rectangular box-like shape. Therefore, the case  18  is provided with a rectangular tube-shaped body part  18   c  and an upper plate part  18   b  formed with the incident window  18   a  is provided on the upper face side of the rectangular tube-shaped body part  18   c . The lens drive magnet  17  is fixed to side face parts which correspond to sides of a quadrangle of the rectangular tube-shaped body part  18   c . Each of the lens drive magnets  17  is formed of a rectangular flat plate-shaped permanent magnet. Each of four lens drive magnets  17  is divided into two pieces in the direction of the optical axis “L” and each magnet piece is magnetized so that a magnetic pole of its inner face and a magnetic pole of its outer face are different from each other. 
     In this embodiment, when the coil holder  13  is viewed in the direction of the optical axis “L”, its inner peripheral shape is circular but its outer peripheral side face which determines the outer peripheral shape of the coil holder  13  is quadrangular and the lens drive coils  30   s  and  30   t  are wound around the coil holder  13 . In this embodiment, four lens drive magnets  17  are respectively divided into two pieces in the optical axis “L” direction and each of the magnet pieces is magnetized so that a magnetic pole of its inner face and a magnetic pole of its outer face are different from each other and thus winding directions of the two lens drive coils  30   s  and  30   t  are opposite to each other. The movable body  3  structured as described above is disposed on an inner side of the case  18 . As a result, the lens drive coils  30   s  and  30   t  respectively face the lens drive magnets  17  which are fixed to the inner faces of the rectangular tube-shaped body parts  18   c  of the case  18 . 
     In the photographing unit  1  structured as described above, the movable body  3  is normally located on the imaging element side (“+Z” side) and, in this state, when an electric current is supplied to the lens drive coils  30   s  and  30   t  in a predetermined direction, an electro-magnetic force toward the object side (“−Z” side) is applied to the respective lens drive coils  30   s  and  30   t . Therefore, the movable body  3  to which the lens drive coils  30   s  and  30   t  are fixed begins to move to the object side (front side). In this case, elastic forces restricting movement of the movable body  3  are generated between the spring member  14   t  and the front end of the movable body  3  and between the spring member  14   s  and the rear end of the movable body  3 . Therefore, the movable body  3  is stopped when the electro-magnetic force for moving the movable body  3  to the front side and the elastic force for restricting the movement of the movable body  3  are balanced. In this case, when an amount of the electric current which is supplied to the lens drive coils  30   s  and  30   t  is adjusted depending on the elastic forces of the spring members  14   s  and  14   t  acting on the movable body  3 , the movable body  3  can be stopped at a desired position. 
     (Internal Structure of Optical Unit  100 ) 
     In the optical unit  100  shown in  FIGS. 1(   a ) and  1 ( b ), a shake correction mechanism (hand shake correction mechanism) for displacing the photographing unit  1  to perform shake correction is structured on an inner side of the fixed cover  230 . In order to structure the shake correction mechanism, in this embodiment, as shown in  FIGS. 1(   a ) and  1 ( b ) and  FIGS. 2(   a ),  2 ( b ) and  2 ( c ), the optical unit  100  includes a fixed body  210 , a movable module  300  holding the photographing unit  1  on its inner side, and a plate-shaped spring member  600  which is connected with the fixed body  210  and the movable module  300 . A movable module drive mechanism is structured between the movable module  300  and the fixed body  210  for generating a magnetic drive force which relatively displaces the movable module  300  with respect to the fixed body  210  as described below. In the optical unit  100 , a sensor flexible circuit board  410  and a drive flexible circuit board  420  are disposed on an opposite side to the object side. 
     (Structure of Fixed Body  210 ) 
     As shown in  FIGS. 1(   a ) and  1 ( b ) and  FIG. 2(   a ), in the fixed body  210 , the coil holding body  260  is provided with support pillar portions  261  at four corner portions and upper end parts of the support portions  261  are connected with each other through crosspiece parts  262 . The support pillar portion  261  is formed with a hole for passing a screw  279  (see  FIG. 1(   b )). Four side faces of the coil holding body  260  are fixed with two “X”-side coils  571  disposed on both sides of the movable module  300  in the “X”-axis direction and two “Y”-side coils  572  disposed on both sides of the movable module  300  in the “Y”-axis direction. The “X”-side coil  571  and the “Y”-side coil  572  are an air-core coil which is wound around in a rectangular frame shape and is provided with two effective side portions facing each other in the “Z”-axis direction. 
     In the fixed body  210 , a frame  270  formed in a rectangular frame shape is disposed on an opposite side to the object side so as to superpose on the coil holding body  260 . The frame  270  is provided with a rectangular frame-shaped part  271  and cylindrical tube parts  272  which are protruded toward the coil holding body  260  at four corner portions of the frame-shaped part  271 . The cylindrical tube part  272  is formed with a hole for passing a screw  279  (see  FIG. 1(   b )). The corner portions of the coil holding body  260  are superposed on the cylindrical tube parts  272  of the frame  270 . Therefore, the coil holding body  260  and the frame  270  are fixed to each other at four corner portions by the screws  279  and, in this fixed state, a fixed body side opening part  210   b  whose size is larger than an area of the photographing unit  1  when projected in the optical axis “L” direction is opened in the optical axis “L” direction on the opposite side to the object side in the fixed body  210 . 
     An auxiliary circuit board  450  is used for power supply to the “X”-side coils  571  and the “Y”-side coils  572 . An end part of the auxiliary circuit board  450  is fixed to an under face of the frame  270  (face on the opposite side to the object side) when the frame  270  and the coil holding body  260  are connected with each other by the screws  279 . 
     (Structure of Movable Module  300 ) 
       FIG. 4  is an exploded perspective view showing the movable module  300  of the optical unit  100  in accordance with the first embodiment of the present invention. As shown in  FIGS. 1(   a ) and  1 ( b ),  FIGS. 2(   b ) and  2 ( c ) and  FIG. 4 , the movable module  300  in the optical unit  100  in this embodiment is provided with the photographing unit  1  described with reference to  FIG. 3 , a rectangular tube-shaped module cover  390  which accommodates the photographing unit  1  on its inner side, a sensor holding plate  370  which is formed in a rectangular frame shape and is disposed so as to superpose on one side of the module cover  390  in the “Z”-axis direction, and a pressing member  380  which is disposed so as to superpose on one side of the sensor holding plate  370  in the “Z”-axis direction. 
     The module cover  390  is provided with a rectangular tube-shaped body part  398 . An outer face of the rectangular tube-shaped body part  398  is fixed with “X”-side magnets  581  which are disposed on both sides of the movable module  300  in the “X”-axis direction and “Y”-side magnets  582  which are disposed on both sides of the movable module  300  in the “Y”-axis direction. Each of the “X”-side magnet  581  and the “Y”-side magnet  582  is structured of two flat plate-shaped magnet pieces arranged in the “Z”-axis direction. The two magnet pieces are magnetized so that an inner face and an outer face are magnetized in different poles from each other and are magnetized so that magnetic poles in the optical axis “L” direction are different from each other. The module cover  390  is made of a magnetic plate and functions as a back yoke. 
     An inner side of the rectangular tube-shaped body part  398  is formed as a sensor accommodation part  396  where a gyroscope  180  (shake detection sensor/angular velocity sensor) is accommodated and as a photographing unit accommodation part  397  where the photographing unit  1  is accommodated. The sensor accommodation part  396  is provided with an upper plate part  394 . In the sensor accommodation part  396 , a block  305  is located on a lower side of the upper plate part  394  and the gyroscope  180  is disposed at a lower position of the block  305 . 
     In the module cover  390 , an object side end part of a portion of the rectangular tube-shaped body part  398  corresponding to the photographing unit accommodation part  397  is located on a further object side with respect to the upper plate part  35  of the sensor accommodation part  396 . Four corner portions of the photographing unit accommodation part  397  are formed with a triangular support plate part  395  (support part). 
     Further, end parts on the opposite side to the object side at four corner portions of the rectangular tube-shaped body part  398  of the module cover  390  are formed with a connecting part  393  protruded toward an outer peripheral side. Each of the four connecting parts  393  is formed with a hole for passing a screw  108 . 
     In this embodiment, an object side end part of the rectangular tube-shaped body part  398  of the module cover  390  is formed as an open end and, in the module cover  390 , a module cover side opening part  390   b  is opened in the optical axis “L” direction. An area of the module cover side opening part  390   b  is larger than a projected area of the photographing unit  1  in the optical axis “L” direction and the module cover side opening part  390   b  is superposed on the fixed body side opening part  210   b.    
     An end part  10   e  on the object side of the photographing unit  1  is formed with four triangular recessed parts  102  which are recessed in the optical axis “L” direction at a portion superposed on the support plate part  395  of the module cover  390 . When the photographing unit  1  is accommodated on the inner side of the module cover  390 , the support plate parts  395  of the module cover  390  are fitted to the recessed parts  102  of the photographing unit  1 . 
     Further, in four outer side faces of the photographing unit  1 , an end face located on the “−Y”-axis side is formed with two projections  103  and both side end parts of an end face located on the “+Y”-axis side are formed with a projection  104 . In this embodiment, the outer side of the photographing unit  1  is the case  18  shown in  FIG. 3  and thus all of the end part  10   e , the recessed parts  102 , the projections  103  and the projections  104  are formed by using the case  18 . An end face of the photographing unit  1  on the opposite side to the object side is connected with a circuit board main body part of a sub circuit board  440  of the drive flexible circuit board  420 . 
     The sensor holding plate  370  is provided with a rectangular frame part  371  and cylindrical tube parts  372  which are protruded toward the module cover  390  at diagonal positions of the rectangular frame part  371 . The cylindrical tube part  372  is formed with a through hole for fitting a screw  108 , and a hole  371   a  for fitting a screw  109  is formed in a pair of side parts facing each other and another side part of the rectangular frame part  371 . Further, an inner edge of the side part of the rectangular frame part  371  where only one hole  371   a  is formed is formed with two cut-out parts  371   c  for holding an elastic spacer  106  on an inner side. 
     The pressing member  380  includes a rectangular flat plate part  381 , two seat parts  386  which are protruded toward the sensor holding plate  370  from a pair of side parts facing each other of the flat plate part  381 , and a seat part  385  which is protruded toward the sensor holding plate  370  from another side part of the flat plate part  381 . The seat parts  385  and  386  are formed with a hole for passing the screw  109 . In this embodiment, a dimension in the “X” direction of the seat part  385  is longer than that of the seat part  386 . 
     (Structure of Drive Flexible Circuit Board  420 ) 
     As shown in  FIGS. 1(   a ) and  1 ( b ),  FIGS. 2(   a ) through  2 ( c ) and  FIG. 4 , in the optical unit  100 , the drive flexible circuit board  420  is disposed on the opposite side to the object side with respect to the fixed body  210 . The drive flexible circuit board  420  is comprised of a main circuit board  430  and a sub circuit board  440  connected with the main circuit board  430 . The main circuit board  430  is provided with a circuit board main body part  431  which is formed in a connected shape of two rectangular portions and two belt-shaped elongated connecting parts  432  and  433  which are extended toward the “+Y”-axis direction from both end portions in a widthwise direction (“X”-axis direction) of the circuit board main body part  431 . The sub circuit board  440  is provided with a rectangular circuit board main body part (not shown) and strip-shaped connection parts  442  and  443  which are extended toward the “+Y”-axis direction from portions located on a little inner side with respect to both end portions in the widthwise direction (“X”-axis direction) of the circuit board main body part and then are bent toward both sides in the “X”-axis direction. In this embodiment, tip end parts of the elongated connecting parts  432  and  433  of the main circuit board  430  and tip end parts of the strip-shaped connection parts  442  and  443  of the sub circuit board  440  are joined to each other. In this manner, the main circuit board  430  and the sub circuit board  440  are integrated with each other to structure the drive flexible circuit board  420  and the main circuit board  430  and the sub circuit board  440  are electrically connected with each other. 
     (Structure of Sensor Flexible Circuit Board  410 ) 
     In the optical unit  100 , a sensor flexible circuit board  410  is disposed on the opposite side to the object side with respect to the photographing unit  1 . The sensor flexible circuit board  410  is provided with a rectangular circuit board main body part  411 , belt-shaped elongated connecting parts  412  and  413  which are extended toward the “+Y”-axis direction from both end portions in a widthwise direction (“X” direction) of the circuit board main body part  411 , and a sensor mounting part  414  having a wider width which connects tip end parts of the elongated connecting parts  412  and  413 . Further, the sensor flexible circuit board  410  is provided with a bent portion  416  which is extended from a portion of the sensor mounting part  414  so as to be interposed between the elongated connecting parts  412  and  413 . The bent portion  416  is perpendicularly bent toward the object side in the vicinity of a connecting part with the sensor mounting part  414  and then is bent toward one side in the “Y”-axis direction. 
     In the sensor flexible circuit board  410 , a gyroscope  180  as a hand shake sensor (angular velocity sensor) is mounted on the sensor mounting part  414  and a block  305  is mounted on an inner side of the bent portion  416 . The block  305  functions as a pressing and fixing member for the gyroscope  180 . 
     (Structure of Spring Member  600 ) 
     The movable module  300  which is structured as described above is supported by the plate-shaped spring member  600  in a state so as to be capable of displacing with respect to the fixed body  210  described with reference to  FIGS. 2(   a ) through  2 ( c ). As shown in  FIG. 2(   c ), the spring member  600  is provided with movable module side connecting parts  610  which are disposed on an inner side and are connected with the movable module  300 , fixed body side connecting parts  620  which are disposed on an outer side and are connected with the fixed body  210 , and arm parts  630  which are extended between the movable module side connecting part  610  and the fixed body side connecting part  620 . The movable module side connecting part  610  and the fixed body side connecting part  620  are respectively formed with a hole for passing the screw  108  and the screw  279 . The spring member  600  is made of nonmagnetic metal such as beryllium copper or nonmagnetic SUS steel material and is formed by means of that a thin plate having a certain thickness is performed by press working or etching processing using photo lithography technique. 
     In this embodiment, the spring member  600  is formed in a rectangular frame shape as a whole and each of the movable module side connecting part  610  and the fixed body side connecting part  620  is disposed at four corner portions of the spring member  600 . Each of the four arm parts  630  is extended in the same direction in the circumferential direction from the movable module side connecting part  610  and is perpendicularly bent and extended to the fixed body side connecting part  620 . In accordance with an embodiment of the present invention, the spring member  600  may be structured so that the movable module side connecting parts  610  and the fixed body side connecting parts  620  are connected with each other in the circumferential direction. 
     (Manufacturing Method for Optical Unit  10 ) 
       FIGS. 5(   a ) and  5 ( b ) and  FIGS. 6(   a ) and  6 ( b ) are explanatory views showing a manufacturing method for the optical unit  100  in accordance with the first embodiment of the present invention. In the following descriptions, a state where the fixed cover  230  is detached from the fixed body  210  is referred to as the fixed body  210 . However, the following steps may be performed in a state that the fixed cover  230  is attached. 
     In order to manufacture the optical unit  100  in this embodiment, the sensor holding plate  370  and the module cover  390  are connected with each other with the screws  108 . In this case, the movable module side connecting parts  610  of the spring member  600  have been previously disposed between the cylindrical tube parts  372  of the sensor holding plate  370  and the connecting parts  393  of the module cover  390 . Therefore, when the sensor holding plate  370  and the module cover  390  are connected with each other with the screws  108 , the movable module side connecting parts  610  of the spring member  600  are sandwiched between the sensor holding plate  370  and the module cover  390 . Further, in this case, the sensor mounting part  414  of the sensor flexible circuit board  410  on which the gyroscope  180  is mounted and the bent portion  416  on which the block  305  is mounted have been previously disposed between sensor holding plate  370  and module cover  390 . As a result, the gyroscope  180  is set in a state that the gyroscope  180  is sandwiched together with the block  305  between the module cover  390  and the sensor holding plate  370 . In this state, the center of the gyroscope  180  is located in a region surrounded by the connecting positions (positions of the screws  108 ) of the module cover  390  with the pressing member  380 . In this embodiment, the gyroscope  180  is formed in a rectangular flat shape and thus the center of the gyroscope  180  is determined as an intersecting point of straight lines obtained by connecting diagonal corners of the gyroscope  180 . 
     Next, in the fixed body  210  shown in  FIG. 2(   a ), when the frame  270  and the coil holding body  260  are to be connected with each other with the screws  279 , the fixed body side connecting parts  620  of the spring member  600  are disposed between the cylindrical tube parts  272  of the frame  270  and the support pillar portions  261  of the coil holding body  260 . Therefore, the fixed body side connecting parts  620  of the spring member  600  are sandwiched between the frame  270  and the coil holding body  260 . In this state, the module cover  390  and the sensor holding plate  370  are set in a supported state so as to be capable of displacing with respect to the fixed body  210  through the spring member  600  (first step). 
     In this case, the circuit board main body part  411  of the sensor flexible circuit board  410  and the end part of the auxiliary circuit board  450  are superposed on the frame  270  and, in this state, the screws  279  are fixed. As a result, the circuit board main body part  411  of the sensor flexible circuit board  410  and the end part of the auxiliary circuit board  450  are fixed to the frame  270  with the screws  279 . Further, in the state where the module cover  390  and the sensor holding plate  370  are disposed on the inner side of the fixed body  210 , the “X”-side magnets  581  of the movable module  300  and the “X”-side coils  571  of the coil holding body  260  are faced each other to structure an “X”-side magnetic drive mechanism of the movable module drive mechanism. Further, the “Y”-side magnets  582  of the movable module  300  and the “Y”-side coils  572  of the coil holding body  260  are faced each other to structure a “Y”-side magnetic drive mechanism of the movable module drive mechanism. 
     Further, as shown in  FIG. 5(   a ), the elongated connecting parts  412  and  413  of the sensor flexible circuit board  410  are located on side positions with respect to a space where the photographing unit  1  is inserted. The module cover side opening part  390   b  of the module cover  390  is not closed by the elongated connecting parts  412  and  413  of the sensor flexible circuit board  410 . Further, the fixed body side opening part  210   b  of the fixed body  210  is larger than the module cover side opening part  390   b  and thus, even when the module cover  390  is disposed on the inner side of the fixed body  210 , the module cover side opening part  390   b  is not closed by the fixed body  210 . 
     Next, as shown in  FIG. 5(   b ), the photographing unit  1  is inserted into an inner side of the module cover  390  from the end part of the module cover  390  on the opposite side to the object side through the fixed body side opening part  210   b  and the module cover side opening part  390   b  to dispose the photographing unit  1  on the inner side of the module cover  390  (second step). 
     Next, as shown in  FIG. 6(   a ), an elastic spacer  106  made of rubber or the like is fitted to the cut-out parts  371   c  of the sensor holding plate  370  and the recessed corner portions of the rectangular frame part  371 . As a result, the elastic spacer  106  is disposed at positions superposed on the projections  103  and  104  of the photographing unit  1  in the optical axis “L” direction. In this case, the circuit board main body part  441  of the sub circuit board  440  has been joined to the end face on the opposite side to the object side of the photographing unit  1 . 
     After that, as shown in  FIG. 6(   b ), the pressing member  380  is superposed on the photographing unit  1  on the opposite side to the object side and screws  109  are fitted to the holes  371   a  of the sensor holding plate  370  through the holes of the seat parts  385  and  386  of the pressing member  380  and thus the pressing member  380  is connected with the module cover  390  through the sensor holding plate  370 . As a result, the photographing unit  1  is sandwiched between the support plate part  395  of the module cover  390  and the pressing member  380 . 
     After that, as shown in  FIG. 1(   b ), the main circuit board  430  is superposed and the circuit board main body part  431  is fixed to the frame-shaped part  271  of the frame  270  by the fixing plate  480  with screws  491 . As a result, the tip end parts of the elongated connecting parts  432  and  433  of the main circuit board  430  and the tip end parts of the strip-shaped connection parts  442  and  443  of the sub circuit board  440  are superposed on each other and thus the tip end parts of the elongated connecting parts  432  and  433  of the main circuit board  430  and the tip end parts of the strip-shaped connection parts  442  and  443  of the sub circuit board  440  are joined with each other. 
     When the optical unit  100  is assembled as described above, the movable module  300  is supported so as to be capable of being displaced with respect to the fixed body  210  through the spring member  600 . Further, on the object side, the recessed part  102  is fitted to the support plate part  395  of the module cover  390  and the photographing unit  1  is directly abutted with the module cover  390  and, on the opposite side to the object side, the projections  103  and  104  of the photographing unit  1  and the seat parts  385  and  386  of the pressing member  380  are abutted with each other through the elastic spacer  106 . Therefore, even when dimensional errors are occurred in the respective members, the dimensional errors are absorbed by compression of the elastic spacer  106 . 
     In accordance with an embodiment of the present invention, it may be manufactured that, in a step before the movable module  300  has been assembled, the tip end parts of the elongated connecting parts  432  and  433  of the main circuit board  430  and the tip end parts of the strip-shaped connection parts  442  and  443  of the sub circuit board  440  are joined to each other to structure the drive flexible circuit board  420  and, in this state, the circuit board main body part  441  of the sub circuit board  440  is joined to the end face on the opposite side to the object side of the photographing unit  1 . 
     (Hand Shake Correcting Operation) 
     In a monitoring result of the gyroscope  180  in the optical unit  100  in this embodiment, when the movable module  300  is detected to be swung around the “Y”-axis by a hand shake, energization to the “X”-side coils  571  is controlled so as to cancel the shake and the movable module  300  is swung around the “Y”-axis. Further, in a monitoring result of the gyroscope  180 , when the movable module  300  is detected to be swung around the “X”-axis by a hand shake, energization to the “Y”-side coils  572  is controlled so as to cancel the shake and the movable module  300  is swung around the “X”-axis. Therefore, the swing of the movable module  300  can be corrected. Further, when the swing around the “X”-axis of the movable module  300  and the swing around the “Y”-axis are combined with each other, the movable module  300  can be displaced for the entire “X-Y” plane. Therefore, all shakes occurred in the optical unit  100  can be corrected surely. 
     (Principal Effects in this Embodiment) 
     As described above, in the optical unit  100  and its manufacturing method in this embodiment, the fixed body  210  is provided with the fixed body side opening part  210   b  which is opened on an opposite side (first direction side) to an object to be photographed side and the module cover  390  is provided with the module cover side opening part  390   b  on an opposite side (first direction) to the object side at a position superposed on the fixed body side opening part  210   b . Therefore, in the first step, the module cover  390  is mounted on the fixed body  210  through the spring member  600  and the movable module drive mechanism  500  is provided between the module cover  390  and the fixed body  210  and, after that, in the second step, the photographing unit  1  is inserted on the inner side of the module cover  390  through the fixed body side opening part  210   b  and the module cover side opening part  390   b . Therefore, the photographing unit  1  can be manufactured in a separate step from a step in which the module cover  390 , the spring member  600 , the movable module drive mechanism  500  are attached to the fixed body  210 . Accordingly, different from a case that inspection is performed after all the members have been assembled, inspection can be performed during manufacturing. Therefore, a loss caused by a defective product can be restrained. 
     Further, the support plate part  395  as a support part is provided on the object side (second direction side) of the module cover  390  and the pressing member  380  is provided on the opposite side (first direction side) to the object side. Therefore, when the photographing unit  1  is inserted in the inside of the module cover  390 , the end part on the object side of the photographing unit  1  (second direction side) is supported by the support plate part  395 . Further, after the pressing member  380  is attached, the end part on the opposite side (first direction side) to the object side of the photographing unit  1  is supported by the pressing member  380 . Therefore, different from a structure in which, after the photographing unit  1  is accommodated in the inside of the module cover  390 , the photographing unit  1  is fixed to the inside of the module cover  390  by adhesion, welding or the like, assembling is easily performed and displacement of the optical axis “L” or the like is hard to be occurred. Accordingly, the production efficiency and yield of the optical unit  100  can be improved. 
     In addition, after the photographing unit  1  is mounted, only the photographing unit  1  can be exchanged and, when the optical unit  100  is to be manufactured, the photographing unit  1  can be easily changed to another photographing unit  1 . 
     Further, in this embodiment, the support part which supports the end part on the object side of the photographing unit  1  (second direction side) is the support plate part  395  of the module cover  390  and thus, even when the support part is not structured by using a separate member, the end part on the object side of the photographing unit  1  (second direction side) is supported. Moreover, the portion of the photographing unit  1  which is superposed on the support plate part  395  is formed with the recessed part  102  which is recessed in the optical axis “L” direction and thus, even when the module cover  390  is provided with the support plate part  395 , the movable module  300  can be made thinner by a depth of the recessed part  102  and the optical unit  100  can be effectively made thinner. 
     Further, the module cover  390  and the photographing unit  1  are directly abutted with each other and the pressing member  380  is abutted with the photographing unit  1  through the elastic spacer  106 . Therefore, even when dimensional errors are occurred in the respective members, the dimensional errors are absorbed by compression of the elastic spacer  106  and thus the photographing unit  1  is surely sandwiched between the module cover  390  and the pressing member  380 . In this case, since the sensor holding plate  370  is surely connected, the gyroscope  180  detects a shake of the movable module  300  surely. 
     Further, in this embodiment, the sensor holding plate  370  is disposed so as to surround the periphery of the photographing unit  1  and the gyroscope  180  is held by the sensor holding plate  370  at a position where the gyroscope  180  is not superposed on the photographing unit  1  in the optical axis “L” direction. Therefore, since the gyroscope  180  and the photographing unit  1  are not superposed on each other in the optical axis “L” direction, the dimension in the optical axis “L” direction (thickness dimension) of the movable module  300  is reduced. Further, when the photographing unit  1  is to be inserted into the inner side of the module cover  390 , the photographing unit  1  is not obstructed by the gyroscope  180 . 
     Further, the sensor holding plate  370  is connected with both of the module cover  390  and the pressing member  380  and thus rigidity of the sensor holding plate  370  is large. In addition, the center position of the gyroscope  180  is disposed in a region surrounded by the connected portions of the sensor holding plate  370  with the module cover  390  and thus rigidity of the portion of the sensor holding plate  370  where the center of the gyroscope  180  is located is large. Therefore, the portion of the sensor holding plate  370  where the center of the gyroscope  180  is located is hard to vibrate and thus, even when the movable module  300  and the optical unit  100  are made thinner, unnecessary vibration is hard to occur in the gyroscope  180  and a shake of the movable module  300  can be surely corrected. 
     Second Embodiment 
     In the second embodiment, after a module cover and the like are mounted on a fixed body, a photographing unit (optical element unit) is inserted in the inside of the module cover from an object side (side to which an optical axis “L” is extended). Therefore, in the second embodiment, “first direction” and “second direction” are as follows: 
     First direction=direction where an optical axis “L” is extended (object side to be photographed) 
     Second direction=direction opposite to a side where the optical axis “L” is extended (opposite side to an object to be photographed) 
     (Structure of Optical Unit) 
       FIGS. 7(   a ) and  7 ( b ) are explanatory views showing an optical unit for photographing in accordance with a second embodiment of the present invention.  FIG. 7(   a ) is a perspective view showing the optical unit which is viewed from an object to be photographed side and  FIG. 7(   b ) is a perspective view showing the optical unit which is viewed from an opposite side to the object side.  FIGS. 8(   a ),  8 ( b ) and  8 ( c ) are explanatory views showing a fixed body and a movable module of the optical unit in accordance with the second embodiment of the present invention.  FIG. 8(   a ) is a perspective view showing a fixed body which is viewed from an object side,  FIG. 8(   b ) is a perspective view showing a movable module which is viewed from the object side, and  FIG. 8(   c ) is a perspective view showing the movable module which is viewed from an opposite side to the object side. In  FIG. 8(   a ), a fixed cover is not shown. Further, a basic structure in the second embodiment is similar to the first embodiment and thus the same reference signs are used in portions having the common functions. 
     An optical unit  100  shown in  FIGS. 7(   a ) and  7 ( b ) and  FIGS. 8(   a ),  8 ( b ) and  8 ( c ) is, similarly to the first embodiment, a thin camera used in a cell phone with a camera and is formed in a roughly rectangular prism shape as a whole. Also in this embodiment, in order to structure a shake correction mechanism, the optical unit  100  includes a fixed body  210  comprised of a fixed cover  230  and a coil holding body  260 , a movable module  300  holding the photographing unit  1  on its inner side, and a plate-shaped spring member  600  which is connected with the fixed body  210  and the movable module  300 , and a movable module drive mechanism  500  for generating a magnetic drive force which relatively displaces the movable module  300  with respect to the fixed body  210  between the movable module  300  and the fixed body  210 . The spring member  600  is provided with a movable module side connecting part  610  which is disposed on an inner side and is connected with the movable module  300 , a fixed body side connecting part  620  which is disposed on an outer side and is connected with the fixed body  210 , and an arm part  630  which is extended between the movable module side connecting part  610  and the fixed body side connecting part  620 . 
     (Structure of Fixed Body  210 ) 
     An upper plate part  211  of the fixed cover  210  which is located at an end part on the object side is formed with a rectangular window-shaped opening part  211   a . In this embodiment, an opening part  211   a  is formed in a wide region including a region superposed on the photographing unit  1  in the optical axis “L” direction. 
     A coil holding body  260  which is used in the fixed body  210  is comprised of a first coil holding member  270  which is formed in a rectangular frame shape and is located on an opposite side to the object side and a second coil holding member  280  which is disposed on the object side so as to be superposed on the first coil holding member  270 . First coils  541 ,  542 ,  543  and  544  are held on a side face of the first coil holding member  270 . Further, second coils  551 ,  552 ,  553  and  554  are held on a side face of the second coil holding member  280 . The first coils  541 ,  542 ,  543  and  544  and the second coils  551 ,  552 ,  553  and  554  are an air-core coil which is wound around in a rectangular frame shape and is provided with two effective side portions facing each other in the “Z”-axis direction. 
     In this embodiment, in order to structure the coil holding body  260  by using the first coil holding member  270  and the second coil holding member  280 , the first coil holding member  270  and the second coil holding member  280  are disposed so as to be superposed on each other in the “Z”-axis direction and then, four pin-shaped terminals  591  formed in a square bar shape are press-fitted to holes formed at four corner portions to connect the first coil holding member  270  and the second coil holding member  280  with each other. In this case, when the fixed body side connecting part  620  of the spring member  600  is disposed between the first coil holding member  270  and the second coil holding member  280 , the fixed body side connecting part  620  is sandwiched and held by the first coil holding member  270  and the second coil holding member  280 . 
     In this embodiment, the pin-shaped terminal  591  is penetrated through the first coil holding member  270  and the second coil holding member  280  in the “Z”-axis direction and both end parts of the pin-shaped terminal  591  are protruded from the coil holding body  260 . Therefore, the first coils  541  through  544  and the second coils  551  through  554  can be electrically connected through four metal pin-shaped terminals  591 . Accordingly, when two pin-shaped terminals  591  and two power supply terminals  594  held by the first coil holding member  270  are soldered to a sensor flexible circuit board  410 , power supply to the first coils  541  through  544  and the second coils  551  through  554  can be performed. 
     An end part on the object side of the coil holding body  260  structured as described above is formed with an opening part  260   a  which is opened in the optical axis “L” direction. The opening part  260   a  has the same size as the opening part  211   a  of the fixed cover  210  and the size is larger than an area that the photographing unit  1  is projected in the optical axis “L” direction. In this embodiment, both of the opening parts  211   a  and  260   a  are included in the fixed body side opening part  210   a.    
     (Structure of Movable Module  300 ) 
       FIGS. 9(   a ) and  9 ( b ) are explanatory views showing the movable module  300  of the optical unit  100  in accordance with the second embodiment of the present invention.  FIG. 9(   a ) is an exploded perspective view showing the movable module  300  when viewed from an object to be photographed side and  FIG. 9(   b ) is an exploded perspective view showing the movable module  300  when viewed from an opposite side to the object side. 
     As shown in  FIGS. 8(   b ) and  8 ( c ) and  FIGS. 9(   a ) and  9 ( b ), in the optical unit  100  in this embodiment, the movable module  300  is provided with the photographing unit  1  which is described with reference to  FIG. 3 , a rectangular tube-shaped module cover  310  which accommodates the photographing unit  1  on its inner side, a support member  330  which is connected with the module cover  310  on the opposite side to the object side with respect to the photographing unit  1 , and a rectangular pressing member  350  which is connected with the module cover  310  on the object side with respect to the photographing unit  1 . 
     In this embodiment, the module cover  310  is formed in a rectangular tube shape and is provided with a module cover side opening part  310   a  on the object side which is opened in the optical axis “L” direction and whose size is larger than an area formed by projecting the photographing unit  1  in the optical axis “L” direction. Further, the module cover  310  is provided with an opening part  310   c  on the opposite side to the object side and a connector member  910  mounted on a drive flexible circuit board  420  described below is located on an inner side of the opening part  310   c.    
     The pressing member  350  is formed with a circular hole  350   a  for guiding light from an object to be photographed to the photographing unit  1 . Further, the pressing member  350  is provided with hooks  353  which are protruded from the vicinities of four corners toward the module cover  310 . The hooks  353  are engaged with engaging projections  318  of the module cover  310  and thus the pressing member  350  and the module cover  310  are connected with each other. 
     The support member  330  is provided with a hook  338  in two side portions facing each other in the “X”-axis direction and is also provided with a hook  338  in one side portion in the “Y”-axis direction. In this embodiment, bent portions of a plurality of the hooks  338  are located at different height positions and a bent portion to an inner side of the module cover  310  is fitted to a portion between the bent portions of the hook parts and, in this manner, the support member  330  and the module cover  310  are connected with each other. Further, an upper face of the support member  330  is provided with a gyro stopper (not shown). The gyro stopper secures a space for disposing the gyroscope  180  between the support member  330  and the photographing unit  1 . 
     Further, the movable module  300  is provided with a first spacer member  321  and a second spacer member  322  which are fixed to an outer peripheral face of the module cover  310 . The first spacer member  321  and the second spacer member  322  are fixed to the outer peripheral face of the module cover  310  in the vicinity of a substantially center in the optical axis “L” direction and the first spacer member  321  and the second spacer member  322  are adjacent to each other in the optical axis “L” direction. 
     Two first magnets  561  formed in a rectangular flat plate shape are disposed on each of four outer faces of the module cover  310  on the opposite side to the object side with respect to the first spacer member  321  so as to be adjacent to each other in the “Z”-axis direction. Further, two second magnets  562  formed in a rectangular flat plate shape are disposed on each of the four outer faces of the module cover  310  on the object side with respect to the second spacer member  322  so as to be adjacent to each other in the “Z”-axis direction. 
     (Holding Structure of Spring Member  600  on Movable Module  300  Side) 
     In this embodiment, the first spacer member  321  and the second spacer member  322  are used as a pair of spring holding members and the movable module side connecting part  610  of the spring member  600  and the module cover  310  (movable module  300 ) are connected with each other. In other words, when the first spacer member  321  and the second spacer member  322  are to be fixed to the module cover  310 , the movable module side connecting part  610  of the spring member  600  is disposed between the first spacer member  321  and the second spacer member  322 . As a result, the movable module side connecting part  610  of the spring member  600  is sandwiched and held by the first spacer member  321  and the second spacer member  322  from both sides in the optical axis “L” direction. Adhesion, welding or the like is performed in a state that the movable module side connecting part  610  of the spring member  600  is sandwiched and held by the first spacer member  321  and the second spacer member  322 . 
     (Structure of Movable Module Drive Mechanism  500 ) 
     When the movable module  300  structured as described above is disposed on an inner side of the coil holding body  260  which is described with reference to  FIG. 8(   a ) and the like, the first magnets  561  of the movable module  300  face the first coils  541 ,  542 ,  543  and  544  of the coil holding body  260  to structure the movable module drive mechanism  500 . Further, the second magnets  562  of the movable module  300  face the second coils  551 ,  552 ,  553  and  554  of the coil holding body  260  to structure the movable module drive mechanism  500 . The movable module drive mechanism  500  is structured so as to sandwich the movable module  300  on both sides in the “X”-axis direction and is structured so as to sandwich the movable module  300  on both sides in the “Y”-axis direction. Therefore, when energization control to the first coils  541  through  544  and the second coils  551  through  554  is performed on the basis of a detection result of the gyroscope  180 , swing of the movable module  300  can be corrected. 
     A sensor flexible circuit board  410  and a drive flexible circuit board  420  are disposed on the opposite side to the object side in the optical unit  100  and the gyroscope  180  is mounted on the sensor flexible circuit board  410 . 
     An external connection part  425  of the drive flexible circuit board  420  is electrically connected with the sensor flexible circuit board  410  and the drive flexible circuit board  420  is extended to an outer side of the optical unit  100 . The drive flexible circuit board  420  is used for energization control to the first coils  541 ,  542 ,  543  and  544  and the second coils  551 ,  552 ,  553  and  554  from the outside. 
     Further, the drive flexible circuit board  420  is used for inputting and outputting a signal to and from the photographing unit  1  and a “Board-to-Board” type connector  900  is used for electrically connecting the drive flexible circuit board  420  with the photographing unit  1 . Therefore, a connector member  910  is mounted on the drive flexible circuit board  420  and a connector member  920  is mounted on an end part on the opposite side to the object side of the photographing unit  1 . The connector member  920  is connected with the connector member  910  to structure the connector  900 . 
     (Manufacturing Method for Optical Unit  10 ) 
       FIG. 10(   a ) through  10 ( d ) are explanatory views showing a manufacturing method for the optical unit  100  in accordance with the second embodiment of the present invention. In order to manufacture the optical unit  100  in this embodiment, first, as shown in  FIGS. 10(   a ) and  10 ( b ), in the first step, the module cover  310  is mounted on the fixed body  210  through the spring member  600 . In this case, the support member  330  has been attached to an end part on the opposite side to the object side of the module cover  310 . Further, the sensor flexible circuit board  410  and the drive flexible circuit board  420  are disposed on the opposite side to the object side of the module cover  310 . In this state, the connector member  910  is located on an inner side of the opening part  310   c  on the opposite side to the object side of the module cover  310 . 
     Next, in the second step, as shown in  FIGS. 10(   c ) and  10 ( d ), the photographing unit  1  is inserted on an inner side of the module cover  310  through the fixed body side opening part  210   a  and the module cover side opening part  310   a . As a result, the connector member  920  provided in the photographing unit  1  is connected with the connector member  910  which is mounted on the drive flexible circuit board  420 . 
     Next, in the third step, as shown in  FIG. 7(   a ), the pressing member  350  is attached to an end part on the object side of the module cover  310  and the end part on the object side of the photographing unit  1  is pressed and supported by the pressing member  350 . 
     (Principal Effects in this Embodiment) 
     As described above, in the optical unit  100  and its manufacturing method in this embodiment, the fixed body  210  is provided with the fixed body side opening part  210   a  which is opened on the object side (first direction side) and the module cover  390  is provided with the module cover side opening part  390   a  on the object side (first direction) at a position superposed on the fixed body side opening part  210   a . Therefore, in the first step, the module cover  310  is mounted on the fixed body  210  through the spring member  600  and the movable module drive mechanism  500  is provided between the module cover  310  and the fixed body  210  and, after that, in the second step, the photographing unit  1  is inserted on the inner side of the module cover  310  through the fixed body side opening part  210   a  and the module cover side opening part  390   a . Therefore, the photographing unit  1  can be manufactured in a separate step from a step in which the module cover  310 , the spring member  600 , the movable module drive mechanism  500  are attached to the fixed body  210 . Accordingly, different from a case that inspection is performed after all the members have been assembled, inspection can be performed during manufacturing. Therefore, a loss caused by a defective product can be restrained. 
     Further, the support member  330  as a support part is provided on the opposite side to the object side (second direction side) of the module cover  310  and the pressing member  350  is provided on the object side (first direction side). Therefore, when the photographing unit  1  is inserted in the inside of the module cover  310 , the end part on the opposite side (second direction side) to the object side of the photographing unit  1  is supported by the support member  330 . Further, after the pressing member  350  is attached, the end part on the object side (first direction side) of the photographing unit  1  is supported by the pressing member  350 . Therefore, different from a structure in which, after the photographing unit  1  is accommodated in the inside of the module cover  310 , the photographing unit  1  is fixed to the inside of the module cover  310  by adhesion, welding or the like, assembling is easily performed and displacement of the optical axis “L” is hard to be occurred. Accordingly, the production efficiency and yield of the optical unit  100  can be improved. 
     In addition, after the photographing unit  1  is mounted, only the photographing unit  1  can be exchanged and, when the optical unit  100  is to be manufactured, the photographing unit  1  can be easily changed to another photographing unit  1 . 
     Further, in this embodiment, the connector  900  (connector members  910  and  920 ) is disposed between the end part on the opposite side (second direction side) to the object side of the photographing unit  1  and the support member  330 . Therefore, the photographing unit  1  and the drive flexible circuit board  420  are electrically connected with each other only by inserting the photographing unit  1  in the inside of the module cover  310 . 
     Other Embodiments 
     In the embodiments described above, at least an embodiment of the present invention is applied to the optical unit  100  which is used in a cell phone with a camera. However, at least an embodiment of the present invention may be applied to an optical unit  100  which is used in a thin digital camera or the like. Further, in the embodiments described above, in addition to the lens  10  and the imaging element  155  in the photographing unit  1 , the lens drive mechanism  5  for magnetically driving the movable body  3  including the lens  121  in the optical axis “L” direction is supported on the support body  2 . However, at least an embodiment of the present invention may be applied to a fixed-focus type optical unit in which the lens drive mechanism  5  is not mounted on the photographing unit  1 . 
     Further, in the embodiments described above, a movable module which is provided with a lens and an imaging element is described as a movable module. However, at least an embodiment of the present invention may be applied to an optical unit which is provided with at least a lens as a movable module. The optical unit includes, for example, a laser pointer, a portable projection display device or an on-vehicle projection display device and the like. 
     While the description above refers to particular embodiments of the present invention, it will be understood that many modifications may be made without departing from the spirit thereof. The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention. 
     The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Technology Classification (CPC): 7