Shutter device for camera
The present invention relates to a shutter device for camera used for small-sized digital equipment and includes a base forming a light transmission hole to expose a film or charge-coupled device (CCD) to laser beam; an electromagnet mounted on one side of the base; a driving arm which is mounted on one side of the electromagnet on the base so as to pivot on the base; a first shutter and a second shutter to open and close the light transmission hole, which pivots on the part of the base in association with the pivoting of the driving arm; and a magnetic which is installed on the driving arm and has the north magnetic pole and the south magnetic pole at opposite ends of the magnetic or on surfaces opposite to the electromagnet. The driving arm drives the first shutter and the second shutter by pivoting in a clockwise or counter-clockwise direction by the attractive force and repulsive force generated between the electromagnet and the magnetic according to the direction of the electric current applied to the electromagnet, the electromagnet includes a bobbin and a coil wound around the bobbin, and each side of the bobbin having opposite poles of magnetic field is disposed adjacent to the north and south pole.
1. A shutter device for a camera, comprising:
a base which forms a light transmission hole to allow light to pass therethrough to expose a film or a charge-coupled device (CCD) to the light;
an electromagnet which is mounted on one side of the base;
a driving arm which is located on one side of the electromagnet on the base and the driving arm having one end portion that is pivotably disposed on the base and an opposite free end portion;
a first shutter and a second shutter which pivot about a part of the base simultaneously in association with pivotal movement of the driving arm, for opening and closing the light transmission hole; and
a magnet which is disposed on the opposite free portion of the driving arm and has a N pole and a S pole magnetized at opposite ends on a surface opposite to the electromagnet,
wherein the driving arm operates the first and the second shutters, while pivoting in a clockwise direction and in a counter clockwise direction by a driving force generated such that the magnet moves in a circular arc with respect to a rotation center of the driving arm due to attractive force and repulsive force which are created between the electromagnet and the magnet according to a direction of current applied to the electromagnet,
wherein the electromagnet comprises a bobbin and a coil wound around the bobbin, and the bobbin has opposite ends where magnetic fields of different poles are generated simultaneously and which are located adjacent to the N pole and the S pole of the magnet.
2. The shutter device as claimed in claim 1 , wherein the bobbin is formed in a shape of a cut-off loop and the opposite ends are arranged parallel to each other with a space therebetween in a pivotal direction of the driving arm.
3. The shutter device as claimed in claim 2 , wherein, in order to open and close the first and the second shutters, according to the pivotal direction of the driving arm, the magnet is shifted from the state where the N pole and the S pole of the magnet are located adjacent to the opposite ends of the bobbin to the state where only one of the N pole and the S pole is located adjacent to one of the opposite ends of the bobbin.
4. The shutter device as claimed in claim 2 , wherein one of the opposite ends of the bobbin is bent in the opposite direction to the other one such that a gap between the opposite ends of the bobbin is set.
5. The shutter device as claimed in claim 2 , wherein the opposite ends of the bobbin are bent in the same direction.
6. The shutter device as claimed in claim 1 , wherein the bobbin stands up in a shape of a cut-off loop and the opposite ends face each other apart from each other.
7. The shutter device as claimed in claim 6 , wherein the bobbin is bent such that the facing opposite ends are misaligned from each other.
8. A shutter device for camera comprising:
a base which forms a light transmission hole to allow light to pass therethrough to expose a film or a charge-coupled device (CCD) to the light;
an electromagnet which is mounted on one side of the base;
a driving arm which is located on one side of the electromagnet on the base and the driving arm having one end portion that is pivotably disposed on the base and an opposite free end portion;
a first shutter and a second shutter which pivot about a part of the base simultaneously in association with pivotal movement of the driving arm, for opening and closing the light transmission hole; and
a magnet which is disposed on the opposite free end portion of the driving arm and has a N pole or a S pole on a surface opposite to the electromagnet,
wherein the driving arm operates the first and the second shutter, while pivoting in a clockwise direction and in a counter clockwise direction by a driving force generated such that the magnet moves in a circular arc with respect to a rotation center of the driving arm due to attractive force and repulsive force which are created between the electromagnet and the magnet according to a direction of current applied to the electromagnet,
wherein the electromagnet comprises a bobbin and a coil wound around the bobbin, and the bobbin has opposite ends where magnetic fields of different poles are generated simultaneously and which are located adjacent to the surface of the magnet opposite to the electromagnet.
9. The shutter device as claimed in claim 8 , wherein the surface of the magnet opposite to the electromagnet has a rounded surface corresponding to a rotational trajectory of the driving arm so as to maintain a constant distance with respect to the opposite ends of the bobbin.
10. The shutter device as claimed in claim 8 , wherein the bobbin is formed in a shape of a cut-off loop and the opposite ends are arranged parallel to each other with a space therebetween in a pivotal direction of the driving arm.
11. The shutter device as claimed in claim 9 , wherein the magnet has an insertion surface which protrudes opposite to the surface of the magnet opposite to the electromagnet and which is inserted into a fixing recess of the driving arm.
12. The shutter device as claimed in claim 9 or 10 , wherein at least one of the opposite ends of the bobbin opposite to the magnet has a rounded surface.
13. The shutter device as claimed in claim 10 , wherein, in order to open and close the first and the second shutters, the N pole or the S pole of the magnet is located adjacent to one of the opposite ends of the bobbin according to a pivotal direction of the driving arm.