Image photographing device having function for compensating for hand vibration
An image photographing device having a function for compensating hand vibration to simultaneously perform auto focusing and hand vibration compensation. The image photographing has a function for compensating hand vibration and includes a bobbin having a lens unit mounted therein, a driving coil in a Z axis direction wound on an outer peripheral surface thereof, and a driving coil in an X axis direction and a driving coil in a Y axis direction mounted outside the driving coil in a Z direction, a plurality of magnets mounted outside the driving coil in an X axis direction and the driving coil in a Y axis direction, an elastic member elastically combined with an upper portion and a lower portion of the bobbin, a housing into which the bobbin combined with the magnet and the elastic member is inserted, and a shield case combined with an upper portion of the housing.
1. An image photographing device having a function for compensating for hand vibration, comprising:
a bobbin having a lens unit mounted therein, a driving coil in a Z axis direction wound on an outer peripheral surface thereof, and driving coils in an X axis direction and a Y axis direction mounted outside the driving coil in a Z direction, wherein the driving coil in the Z axis direction is wound over the whole peripheral surface between an upper plate and a lower plate of the bobbin;
a plurality of magnets mounted outside the driving coils in an X axis direction and a Y axis direction;
an elastic member elastically combined with an upper portion and a lower portion of the bobbin;
a housing into which the bobbin combined with the magnet and the elastic member is inserted; and
a shield case combined with an upper portion of the housing.
2. The image photographing device having a function for compensating for hand vibration according to claim 1 , wherein the lens unit has at least one lens stacked inside a cylindrical lens barrel.
3. The image photographing device having a function for compensating for hand vibration according to claim 1 , wherein a lower portion of the housing is mounted with a substrate of which a center is mounted with an image sensor.
4. The image photographing device having a function for compensating for hand vibration according to claim 1 , wherein the bobbin is formed in a polygonal shape, and the driving coils in an X axis direction are disposed on one opposite side of the bobbin and the driving coils in a Y axis direction are disposed on another opposite side thereof.
5. The image photographing device having a function for compensating for hand vibration according to claim 4 , wherein a pair of driving coils in an X axis direction and a pair of driving coils in a Y axis direction are disposed in parallel at predetermined intervals on each side of the bobbin .
6. The image photographing device having a function for compensating for hand vibration according to claim 5 , wherein the pair of driving coils in an X axis direction and the pair of driving coils in a Y axis direction disposed in parallel on one side of the bobbin are wound in opposite direction to each other.
7. The image photographing device having a function for compensating for hand vibration according to claim 6 , wherein the driving coil in an X axis direction and the driving coil in a Y axis direction formed at opposite positions in a diagonal direction of the four driving coils disposed on the opposite sides of the bobbin are wound in the same direction.
8. The image photographing device having a function for compensating for hand vibration according to claim 1 , wherein Fleming's left hand rule is applied to the driving coil in a Z axis direction and the driving coil in an X axis direction and the driving coil in a Y axis direction through the magnet disposed on four sides of the bobbin when current is applied to the coils to generate an electromagnetic force in an X axis direction and a Y axis direction, respectively.
9. The image photographing device having a function for compensating for hand vibration according to claim 8 , wherein the magnet is disposed so that N poles thereof face the four sides of the bobbin on which the driving coil in an X axis direction and the driving coil in a Y axis direction are mounted.
10. The image photographing device having a function for compensating for hand vibration according to claim 9 , wherein the magnet is formed with a width exceeding inner winding portions of the pair of driving coils in an X axis direction and the pair of driving coils in a Y axis direction but not exceeding outer winding portions of the pair of driving coils in an X axis direction and the pair of driving coils in a Y axis direction.
11. The image photographing device having a function for compensating for hand vibration according to claim 1 , wherein the elastic members have power connectors each extendedly formed on one side thereof, to be electrically connected to the substrate mounted on a lower portion of the housing.
12. The image photographing device having a function for compensating for hand vibration according to claim 11 , wherein the elastic members apply current to the driving coil in a Z axis direction and the driving coil in an X axis direction and the driving coil in a Y axis direction wound on the bobbin through springs formed on all sides thereof.