Abstract:
A photography device with anti-shake function for sensing camera shake and moving a lens toward a direction to correct the camera shake when photographing an object so that the object may be clearly photographed. A coil and a magnet are included in the invention, and the coil moves in a direction perpendicular to the optical-axis of the lens as a result of magnetic fields generated by the magnet and the coil when electric power is applied to the coil.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a photography device with anti-shake function, and more particularly, to a photography device which senses shake of the photography device and moves lens in a direction correcting the shake to thereby allow an object to be clearly photographed. 
     2. Description of the Prior Art 
     In recent, compact electronic devices including a communication device such as a cellular phone are equipped with a compact photography device for photographing an image. These photography devices are characterized by compact and simple structure. 
     These photography devices includes a lens group consisting of a plurality of lenses and an image pickup device which converts optical signals transmitted through the lens group into electric signals. 
     However, when a user&#39;s hand grasping the electronic device equipped with the photography device is shaken or vibration is transferred to the electronic device by another external factor, the vibration is transferred to the photography device and thus the image of an object is blurred. 
     A support is required to photograph a clear image Due to this problem, but is hardly used since it is uncomfortable to be carried. 
     Therefore, deterioration in an image due to shake is inevitable for the general photography device for electronic devices. 
     SUMMARY OF THE INVENTION 
     Embodiments of the present invention are directed to a photography device which senses shake of the photography device upon photographing of an object and moves lens in a direction correcting the shake to thereby allow the object to be clearly photographed. 
     In one embodiment, a photography device with anti-shake function includes: a housing; a holder mounted horizontally movably to the housing; a lens unit mounted up and down movably in an inside of the holder and including a lens therein; a first coil member mounted in an outside of the lens unit; a second coil member mounted to the holder; a magnet mounted to a side surface of the housing; and an iron piece member having one end which is in contact with the magnet and the other end which is disposed adjacently to the first coil member, wherein the lens unit moves up and down by interaction of a magnetic field generated by the magnet and induced via the iron piece member with a first electromagnetic field generated when power is applied to the first coil member, and the holder moves horizontally by interaction of the magnetic field generated by the magnet and induced via the iron piece member with a second electromagnetic field generated when power is applied to the second coil member. 
     The first coil member is wound on an outer circumferential surface of the lens unit with respect to an optical axis of the lens, the second coil member is wound in a hollowed cylindrical shape and mounted on an outer circumferential surface of the holder, and the iron piece member penetrates the second coil member. 
     The holder includes a through hole penetratively formed in a side surface of the holder so that an inside and outside of the holder communicates with each other; and a fixation projection projecting towards the magnet from both sides of the through hole, wherein the second coil member is inserted on the fixation projection and the iron piece member passes through the second coil member between the fixation projections and is penetratively inserted in the through hole. 
     The magnet is mounted to upper and lower ends of the iron piece member, respectively, and the polarities on sides in contact with the iron piece are the same. 
     The photography device further includes: a first elastic member mounted to the lens unit to elastically support the lens unit in an up and down direction and electrically connected with the first coil member; and a power terminal connected with the first elastic member to transfer power to the first coil member via the first elastic member, wherein the power terminal includes a first extension part formed parallel to an outer surface of the holder; and a second extension unit bent from the first extension part. 
     The photography device further includes: a second elastic member having one end mounted to the housing and the other end mounted to the holder to elastically support the holder in a horizontal direction, wherein the second elastic member is connected with the second coil member to transfer the power to the second coil member. 
     The second coil member is provided in plural such that a pair of the second coil members is mounted on the outer surface of the holder facing with each other, and the second elastic member is provided in plural such that the second elastic member applies the same power to the pair of facing second coil members. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a perspective view illustrating a photography device with anti-shake function in accordance with a second embodiment of the present invention. 
         FIG. 2  is an exploded perspective view illustrating the photography device of  FIG. 1 , viewed from one direction. 
         FIG. 3  is an exploded perspective view illustrating the photography device of  FIG. 1 , viewed from another direction. 
         FIG. 4  is a sectional view illustrating the photography device of  FIG. 1 . 
         FIG. 5  is a sectional view illustrating operation state of the photography device of  FIG. 4 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, an embodiment of the present invention will be described. 
       FIG. 1  is a perspective view illustrating a photography device with anti-shake function in accordance with a second embodiment of the present invention;  FIG. 2  is an exploded perspective view illustrating the photography device of  FIG. 1 , viewed from one direction; and  FIG. 3  is an exploded perspective view illustrating the photography device of  FIG. 1 , viewed from another direction. 
       FIG. 4  is a sectional view illustrating the photography device of  FIG. 1 ; and  FIG. 5  is a sectional view illustrating operation state of the photography device of  FIG. 4 . 
     As illustrated in  FIGS. 1 to 3 , the photography device of the present embodiment includes a base  110 , a lens holder  120 , a cover  130 , a wire spring  140 , a first substrate  150 , a second substrate  160 , a control unit  170  and a drive unit  180 , and the drive unit  180  includes a coil member  181 , an upper magnet  182 , a lower magnet  183  and an iron piece member  184 . 
     The base  110  has a generally rectangular shape and is formed with an opening hole of which upper and lower parts are opened, and an outer corner part projects upwardly to come in contact with the cover  130 . 
     Also, in an outside of the base  110 , i.e. between the upwardly projected corner parts, a lower fixation part  111  for mounting the lower magnet  183  therein is formed. 
     The lower fixation part  111  is formed in four places that are symmetric with each other along the outer surface of the base  110 , and is formed by being depressed downwardly on the upper surface. 
     Also, below the lower fixation part  111 , a stopping projection  112  that projects upwardly is formed. 
     The stopping projection  112  is formed as a bottom surface of the lower fixation part  111  abutting the inside of the base  110  is projected higher than the bottom surface of the lower fixation part  111  abutting the outside of the lower fixation part  111 . 
     Therefore, the stooping projection  112  functions to stop the movement of the lower magnet  183  mounted to the outside of the lower fixation part  111  in a direction toward the inside of the base  110 , i.e. in a direction toward the lens holder  120 . 
     This base  110  is generally disposed above the image sensor that photograph an image of an object, and the lens holder  120  for mounting a lens therein is disposed above the base  110 . 
     A size of the lens holder  120  is formed smaller than the inner width of the base  110  so as not to be interfered with the inner surface of the base  110 , and the center of the lens holder is formed with a hole for inserting a lens (not shown) therein. 
     Both sides of the hole of the lens holder  120  are formed with a stopping groove  121  depressed downwardly, respectively. 
     Also, the lens holder  120  has a lower end of the corner part extending in a plate shape, and the wire spring is inserted in and passes through this corner part. 
     Also, the cover  130  is disposed above the lens holder  120  and mounted on the base  110  so as to enclose the lens holder  120 . 
     The cover  130  has a rectangular shape and has an outer corner part, which projects toward the base  110  and is engagingly coupled with the base  110  so as to enclose the lens holder  120 . 
     Also, the center of the cover  120  is formed with an opening hole that is communicated with the lens holder  120 , and both sides of the opening hole are formed with a stopping projection  133  inserted in the stopping groove  121  of the lens holder  120 , respectively. 
     The stopping projection  133  is downwardly projected toward the lens holder  120  and is stopped in the stopping groove  121 . 
     As described above, the lens holder  120  is prevented from being rotated and lifted to damage the wire spring  140  by forming the stopping groove  121  in the upper part of the lens holder  121  and forming the stopping projection  133  downwardly projecting to be inserted in the stopping groove  121  in the cover  130 . 
     Also, an upper fixation part  131  is formed between the outer corner parts of the cover  130  that are projected toward the base  110 . 
     Like the lower fixation part  111 , the upper fixation part  131  is formed in four places that are symmetric with each other along the outer surface of the cover  130 , and is formed by being depressed upwardly on the lower surface. 
     Also, above the upper fixation part  131 , a stopping projection  132  that projects downwardly is formed. 
     The stopping projection  132  is formed as a top surface of the upper fixation part  131  abutting the inside of the cover  130  is projected higher than the top surface of the upper fixation part  131  abutting the outside of the upper fixation part  131 . 
     Therefore, the stooping projection  132  functions to stop the movement of the upper magnet  182  mounted to the outside of the upper fixation part  111  in a direction toward the inside of the cover  130 , i.e. in a direction toward the lens holder  120 . 
     As described above, it is possible to guide the positions upon assembling of the lower magnet  182  and the upper magnet  183  and prevent departure of the lower magnet  182  and the upper magnet  183  from the lower fixation part  111  and the upper fixation part  131  by forming the stopping projections  112 ,  132  that stop the movement of the lower magnet  182  and the upper magnet  182  in the direction toward the lens holder  120  in the lower fixation part  111  and the upper fixation part  131 . 
     The wire spring  140  is made of metal material through which electricity flows, and has a characteristic that it is bent in left and right when an external force is applied and is restored to the original state when the external force is removed. 
     Also, the wire spring  140  is formed elongated in an up and down direction, and the upper end thereof is mounted to the cover  130  and the lower end is mounted to the lens holder  120  to elastically support the lens holder  120  upwardly above the cover  130 . 
     That is, tension that floats the lens holder  110  from the base  110  by a predetermined gap is generated in the wire spring  140 . 
     Also, a force is applied downwardly to the lens holder  120  in an assembling process of inserting the lens in the lens holder, and at this time, the wire spring  140  supports the lens holder  120  upwardly and tightly since its upper end is fixed to the cover  130  and thus does not move. 
     As described above, it is possible to generate the force applied to the wire spring in a direction that lengthen the wire spring  140  and thus prevent the wire spring  140  from being excessively bent to be damaged by mounting the upper end of the wire spring  140  to the cover  130  and the lower end to the lower end of the lens holder  120  to support the lens holder  120  with respect to the cover  130 . 
     The lower end of the wire spring  140  is penetratively inserted in the lens holder  120  and the wire spring  140  is connected with the first substrate  150  mounted on the lower end of the lens holder  120 . 
     The first substrate  150  is a rectangular shaped printed circuit board (PCB) and is made of electrically insulated synthetic resin, and is formed with an opening hole that is communicated with the lens holder  120  and first copperplate parts  151 , into which the lower end of the wire spring  140  is penetratively inserted and fixed, in four symmetric positions with respect to the opening hole. 
     The first copperplate part  151  is made by attaching a copperplate along the outer surface of the hole that is penetrated in up and down direction, and is formed so as to allow lead to be easily welded. 
     That is, the lower end of the wire spring  140  inserted in the first copperplate part  151  is soldered and fixed to the first copperplate part  151 . 
     Also, the upper end of the wire spring  140  is penetratively inserted in the cover  130  and connected with the second substrate  160  mounted above the cover  130 . 
     The second substrate  160  has a rectangular shape, and is formed with an opening hole that is communicated with the lens holder  120  and second copperplate parts  161 , into which the upper end of the wire spring  140  is penetratively inserted and fixed, in four symmetric positions with respect to the opening hole. 
     Like the first substrate  150 , the upper end of the wire spring  140  is soldered and fixed to the second copperplate part  161  of the second substrate  160 . 
     Also, the second substrate  160  is formed with a flexible circuit unit  162  that electrically connects the second substrate  160  and the control unit  170 . 
     The flexible circuit unit  162  is made of a flexible printed circuit board (FPCB) so that is can be easily bent. 
     Also, the flexible circuit unit  162  is formed so as to be electrically connected with the second copperplate part  161 . 
     That is, a metal plate extends between the flexible circuit unit  162  and the second copperplate part  161  of the second substrate  160  so as to flow electricity therebetween. 
     This flexible circuit unit  162  is formed extending to the lower side of the base  110  along the side surfaces of the cover  130  and the base  110 . 
     At this time, the side surfaces of the cover  130  and the base  110  are formed with a seating groove  135  in which the flexible circuit unit  130  is inserted and seated. 
     The seating groove  135  is formed low toward the inside of the cover  130  or the base  110  so that the flexible circuit unit  162  is not projected over the outer surface of the cover  130  or the outer surface of the base  110 . 
     As described above, it is possible to make the anti-shake device having same overall outer width to thereby reduce the size and simplify the outer appearance by forming the seating groove  135  in which the flexible circuit unit  130  is inserted and seated on the side surfaces of the cover  130  and the base  110 . 
     Meanwhile, the control unit  170  is mounted below the base  110  and connected with the flexible circuit unit  162  to control power supplied to the drive unit  180 . 
     The drive unit  180  is mounted between the base  110  and the cover to move the lens holder  120  in a horizontal direction upon power apply. 
     That is, the drive unit  180  is connected with the lower end of the wire spring  140  or the first substrate  150 , and is electrically connected with the wire spring  140  and receives power from the control unit  170  to move the lens holder  120  in the horizontal direction. 
     Specifically, the coil member  181  of the drive unit  180  is an electric wire in which a metal wire through which electricity flows is coated by an insulator, and is wound in a direction parallel to the side surface of the lens holder  120 . 
     Also, the coil member  181  is mounted on the four symmetric positions on the outer surface of the lens holder  120 . 
     At this time, the outer surface of the lens holder  120  is formed with a guide projection  122  for guiding the position upon assembly of the coil member  181  and facilitating the fixation. 
     Also, the coil members  181  disposed oppositely to each other on the lens holder  120  are made by winding a single wire in opposite directions. 
     Both ends of this coil member  181 , extend, as illustrated in  FIG. 4 , to be fixed to the first copperplate part  151  of the first substrate  150  together with the lower end of the wire spring  140  so that they are electrically connected with each other. 
     However, the end of the coil member  181  extending to both sides of the coil member  181  is electrically connected with the wire spring  140  disposed diagonally thereto. 
     It is possible to enlarge position for fixing the wire spring  140  and the drive unit  180  and facilitate the connection between them by connecting the lower end of the wire spring  140  and the drive unit  180  to the first substrate  150  formed with the first copperplate part  151  to which the lower end of the wire spring  140  is penetratively fixed as described above. 
     Also, it is possible to simplify the assembly process for connecting the wire spring  140  and the end of the coil member  181  by fixing the end of the coil member  181 , together with the wire spring  140 , to the first copperplate part  151  to which the wire spring  140  is penetratively fixed. 
     Meanwhile, the first substrate  150  is formed with an avoid groove  152  in which the end of the coil member  181  is disposed when fixing the end of the coil member  181  to the first copperplate part  151 . 
     The avoid groove  152  is formed as the outer surface of the first substrate  150  is depressed inwardly, and the size of this avoid groove  152  is greater than the diameter of the end of the coil member  181 . 
     By forming the avoid groove  152  in which the end of the coil member  181  is disposed and making the size of the avoid groove  152  greater than the diameter of the end of the coil member  181  as described above, it is possible to insert the end of the coil member  181 , which is disposed below the first substrate  150 , in the avoid groove  152  and thus prevent that the end of the coil member  181  is interfered with the base  110  upon movement of the lens holder  120 . 
     The upper magnet  182  and the lower magnet  183  are formed in a hexahedral shape and two-pole magnetized in up and down direction. 
     Also, the upper magnet  182  is inserted in the upper fixation part  131  of the cover  130 , and the lower magnet is inserted in the lower fixation part  111  of the base  110 . 
     These upper magnet  182  and lower magnet  183  are disposed adjacently to the side surface of the coil member  181 , and same polarities of them face to each other to form a magnetic field. 
     The iron piece member  184  has a hexahedral shape, where one end thereof is inserted between the upper magnet  182  and the lower magnet  183  and the other end is inserted in the center of the coil member  181 . 
     That is, the one end of the iron piece member  184  is in contact with the lower surface of the upper magnet  182  and the upper surface of the lower magnet  183 , and the other end is formed projecting toward the coil member  181  to be adjacent to the coil member  181 . 
     Next, operation of the photography device constituted as described above will be described. 
     In general, the control unit  170  supplies power to the coil member  181  to correct shake when the camera senses the shake using a gyro-sensor mounted in the camera. 
     Therefore, the coil member  181  is electrically connected with the control unit  170  via the second substrate  160 , the wire spring  140  and the first substrate  150 , and receives power from the control unit  170  to move the lens holder  120  in a horizontal direction. 
     As illustrated in  FIG. 4 , as the lens holder  120  move to the right, the lower end of the wire spring  140  moves to right of the upper end of the wire spring  140  and thus the wire spring  140  leans to the right. 
     At this time, the end mounted to the lens holder  120  moves to the right together with the lens holder since it is fixed to the first substrate  150  together with the lower end of the wire spring  140 . 
     That is, since the coil member  181  moves together with the lens holder  120  upon the horizontal movement of the lens holder  120 , the end of the coil member  181  hardly moves. 
     By connecting the drive member  180  with the lower end of the wire spring  140  to electrically connect the drive member  180  with the wire spring  140  as described above, it is possible to minimize the external force applied to the drive unit  180  upon the horizontal movement of the lens holder  120  while the drive member receives the power via the wire spring  140 . 
     The photography device with anti-shake function of the present invention is installed in a compact electronic device such as a hand-held device and moves the lens in a direction correcting shake when the shake is generated upon photographing of an object to thereby allow the object to be clearly photographed. 
     While the present invention has been described with respect to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.