Image photographing device
The present invention relates to an image photographing device, and is invented to absorb vibration of the plate spring when the lens holder is moved, thereby stabilizing rapidly the lens holder. According to one example, the small camera provided with a damper includes a lens holder provided with lens and driven in an optical axial direction, a fixing unit housing the lens holder, a plate spring which is arranged to the upper part or lower part of the lens holder and connects the lens holder to the fixing unit and supports it so that the lens holder is moved in an optical axial direction, a driving unit for driving the lens holder in an optical axial direction, a support unit arranged on the lower parts of the lens holder and the fixing unit, and a damper member attached to the plate spring for absorbing vibrations of the plate spring wherein the damper member is made with polymer chemical having an elastic force and the elastic force of the damper member is smaller than that of the plate spring.
1. A small camera device comprising:
a lens holder provided with lens and driven in an optical axial direction;
a fixing unit housing the lens holder;
a plate spring which is arranged to the upper part or lower part of the lens holder and connects the lens holder to the fixing unit and supports it so that the lens holder is moved in an optical axial direction;
a magnet fixed to the fixing unit in a direction to the lens holder;
coils surrounding the lens holder to be exposed to a magnetic field of the magnet; and
a non-magnetic conductive body surrounding the lens holder in a parallel to the coils to be exposed to a magnetic field of the magnet wherein an upper seating projection is formed protrudingly on the upper part of the lens holder in an outer peripheral surface direction and a lower seating projection is formed protrudingly on the lower part of the lens holder in an outer peripheral surface direction, and further the coil and the non-magnetic conductive body are mounted to surround the lens holder between the upper seating projection and lower seating projection.
2. A small camera device as claimed in claim 1 , wherein the projection lengths of the upper seating projection and the lower seating projection are larger than a summing thickness of the coil and the non-magnetic conductive body.
3. A small camera device provided with a damper as claimed in claim 1 , wherein a middle seating projection is formed protrudingly on a middle part of the lens holder in an outer peripheral surface direction, and the coil includes an upper coil arranged between the upper seating projection and the lower seating projection and a lower coil arranged between the middle seating projection and the lower seating projection.
4. A small camera device as claimed in claim 3 , wherein a projection length of the middle seating projection is larger than a summing thickness of the coil and the non-magnetic conductive body and the non-magnetic conductive body includes an upper non-magnetic conductive body covering the upper coil and a lower non-magnetic conductive body covering the lower coil.
5. A small camera device as claimed in claim 3 , wherein a projection length of the middle seating projection is smaller than those of the upper seating projection and the lower seating projection and larger than a thickness of the coil, and further the non-magnetic conductive body covers all of the upper seating projection, the middle seating projection and the lower coil between the upper seating projection and the lower seating projection.
6. A small camera device provided with a damper as claimed in claim 2 , wherein a middle seating projection is formed protrudingly on a middle part of the lens holder in an outer peripheral surface direction, and the coil includes an upper coil arranged between the upper seating projection and the lower seating projection and a lower coil arranged between the middle seating projection and the lower seating projection.