KR20100130386A - Shutter apparatus for camera - Google Patents

Abstract

PURPOSE: A shutter apparatus for a camera is provided to implement photographing operation for various displays by adopting a filter blade. CONSTITUTION: One ends of first and second shutters(40,50) are respectively connected to a base(10) and allows the rotation thereof. The first and second shutters are connected to one portion of a shutter driver(30), and opens and closes a light transmitting hole through the linkage with the shutter driving unit. One end of a filter blade(70) is connected to the base and allows the connection thereof. The filter blade opens and closes the light transmittance hole through the interworking with the driving unit.

Description

Shutter apparatus for camera

The present invention relates to a shutter device for a camera, and more particularly, to a shutter device for a camera used in a small digital device.

With the development of digital technology, various digital devices such as mobile communication terminals, handheld game consoles, personal digital assistants (PDAs), personal multimedia players (PMPs), and digital camcorders have been introduced.

The camera unit installed in such a small portable digital device includes a shutter device that can take a picture like a normal camera.

In particular, as the camera of a mobile phone, a mobile communication terminal, becomes high quality, the adoption of a mechanical shutter is essential. In order to slim down a mobile phone, miniaturization and slimming of the camera module are also essential, so it is important to simplify the structure of the shutter device. In addition, the camera unit preferably makes the shutter operation speed as fast as possible in order to take good quality pictures.

However, the conventional camera shutter device used in such a small portable digital device has adopted a power source having a relatively large size for transferring a predetermined driving force to the shutter in order to ensure a fast driving speed of the shutter, accordingly the shutter device Of course, there was a problem that the overall size of the lens unit is increased. This problem ultimately affects the size of the entire portable digital device, thereby reducing the portability of the small portable digital device.

In addition, the camera shutter device used in a small portable digital device is manufactured in a very small size, and the size of the shutter device increases when a filter used for various photographing operations, for example, an ND filter is embedded in the shutter device itself. When taking a picture with a mobile phone equipped with a camera shutter device, there was a limitation that can only take a monotonous image compared to a conventional independent camera.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shutter device for a camera which is adopted in a small portable digital device such as a mobile phone which can form a very small size and can maintain the driving performance of the shutter.

In addition, another object of the present invention is to provide a shutter device for a camera that can take a picture for a variety of production by employing an ND filter.

In order to achieve the above object, the present invention includes a base having a light transmitting hole (H) for passing a light to expose a film or a charge-coupled device (CCD); A shutter driver disposed at one side of the base; First and second shutters each of which is pivotally connected to the base and connected to a part of the shutter driver to open and close the light transmission hole H in conjunction with the operation of the shutter driver; A filter blade driving unit disposed at the other side of the base; And a filter blade having one end pivotably connected to the base and connected to a portion of the filter blade driving unit to open and close the light transmission hole H in conjunction with the operation of the filter blade driving unit. A shutter device for a camera is provided.

Preferably, the filter blade is formed of an ND (Neutral Denstiy) filter to open and close the light transmission hole (H). In addition, the filter blade may be attached to at least one reinforcing blade to reinforce the strength of the rotation center portion.

The shutter driving unit, an electromagnet mounted on one side of the base; A driving arm disposed on one side of the electromagnet on the base and rotatably installed on the base; And magnetic poles installed on the driving arm and opposite magnetic poles opposite to the opposite or opposite surfaces of the electromagnet, wherein the magnetic poles are magnetized to each other according to a direction of the electric current transferred to the electromagnet. By the attractive force and repulsive force generated between the magnetics, the first and second shutters are operated while turning clockwise and counterclockwise, wherein the electromagnet consists of a bobbin and a coil wound on the bobbin, and the bobbin is simultaneously It is preferable that both ends of the magnetic field of different poles are disposed adjacent to the magnetic.

The filter blade drive unit, an electromagnet mounted on the other side of the base; A driving arm disposed on one side of the electromagnet on the base and rotatably installed on the base; And magnetic poles installed on the driving arm and opposite magnetic poles opposite to the opposite or opposite surfaces of the electromagnet, wherein the magnetic poles are magnetized to each other according to a direction of the electric current transferred to the electromagnet. The filter blade is operated while turning clockwise and counterclockwise by the attractive force and repulsive force generated between the magnetics, and the electromagnet consists of a bobbin and a coil wound on the bobbin, and the bobbin is simultaneously of different poles. Both ends of the magnetic field are preferably disposed adjacent to the magnetic.

The bobbin may have a U shape such that a magnetic field generated in the electromagnet forms a closed loop, and both ends thereof may be horizontally disposed at intervals with respect to a turning direction of the driving arm.

As described above, in the present invention, the size of the shutter device can be made extremely small while maintaining the driving performance of the shutter, and the ND filter which can obtain a light reduction effect can be used to take pictures for a more diverse production. There is an advantage.

Hereinafter, a configuration of a shutter device for a camera according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 and 2 are exploded perspective and exploded perspective views respectively showing a shutter device for a camera according to an embodiment of the present invention.

1 and 2, the shutter device for a camera according to the present embodiment includes a base 10, a shutter driver 30, first and second shutters 40 and 50, a filter blade driver 60, and The filter blade 70 is included.

The base 10 is coupled to the first plate 11 through which the light transmission hole (H) penetrates substantially in the center thereof, and a plurality of fixing protrusions 13 for fixing the cover 20 along the inner circumference thereof are predetermined intervals. Is formed.

In addition, the base 10 has a shutter rotation shaft 15, which is a rotation center of the first and second shutters 40 and 50, protrudes from one corner where the shutter driver 30 is disposed, and the filter blade driver 30 is formed. The filter blade rotation shaft 17 serving as the rotation center of the filter blade 70 protrudes from the opposite corner to be disposed.

In addition, the first bracket 16 for fixing the shutter driver 30 to the base 10 is installed at one side of the base 10. The first bracket 16 is formed with a first guide hole 16a for slidably guiding the connecting projection 36b of the drive arm 35, and the first guide hole 16a is the drive arm 35 Has a curvature corresponding to the rotational trajectory of In addition, the first bracket 16 has a first hole 16b to which the shaft projection 36a of the driving arm 35 is rotatably coupled, and a second hole 16c to which the shutter rotation shaft 15 is rotatably coupled. And a third hole 16d into which any one of the plurality of fixing protrusions 13 of the base 10 is inserted and fixed.

In addition, a second bracket 18 is installed at the other side of the base 10 to fix the filter blade driving unit 60 to the base 10. The second bracket 18 is formed in the same manner as the first bracket 16. That is, a second guide long hole 18a for slidably guiding the connecting projection 66b of the drive arm 65 is formed, and the second guide long hole 18a corresponds to the rotational trajectory of the drive arm 65. To have curvature. In addition, the second bracket 18 includes a fourth hole 18b to which the shaft projection 66a of the drive arm 65 is rotatably coupled, and a fifth hole 18c to which the filter blade rotation shaft 17 is rotatably coupled. ) And a sixth hole 18d into which one of the plurality of fixing protrusions 13 of the base 10 is inserted and fixed.

In addition, the base 10 includes a pair of first limiting protrusions 19a and 19b for limiting a range of rotation angles of the drive arm 35 of the shutter driver 30, and a drive arm 65 of the filter blade driver 60. And a pair of second limiting projections 19c and 19d for limiting the range of the rotation angle of?).

In addition, the base 10 has a state in which the first and second stoppers 14a and 14b face each other to limit the rotation angle when the first and second shutters 40 and 50 open the light transmission hole H. Is formed. Referring to FIG. 4, the first stopper 14a is in surface contact with the straight end 47 of the first shutter 40, and the second stopper 14b is at the straight end 57 of the second shutter 50. Each is in surface contact.

In this case, it is important that the first and second shutters 40 and 50 that are precisely swiveling at high speed maintain their positions constantly when opening and closing the light transmitting hole H in consideration of optical characteristics. In the example, the first and second shutters 40 and 50 are provided through a pair of first limiting projections 19a and 19b and first and second stoppers 14a and 14b that control the maximum rotation angle of the driving arm 35. The stop position of can be controlled in double.

On the other hand, the filter blade 70 is limited to the maximum rotation angle by the first stopper (14a) when opening the light transmission hole (H) (see Fig. 3), a plurality of fixing projections 13 when closing the light transmission hole (H) ), The maximum rotation angle is limited by the fixing protrusion 13 adjacent to the driving arm 65 of the filter blade driving unit 60 (see FIG. 7).

Furthermore, the base 10 may be a predetermined FPCB (not shown) for applying a current to a predetermined circuit part, for example, the coil 33 of the shutter driver 30 and the coil 43 of the filter blade driver 40. Is installed.

The cover 20 has a light transmission hole H formed coaxially with the light transmission hole H of the first plate 11, and the light transmission hole H of the cover 20 is at least a first plate. It may have a diameter larger than or equal to the light transmitting hole (H) of (11).

In addition, the cover 20 is formed with a plurality of coupling holes 23 through which a plurality of fixing projections 13 of the base 10 are inserted. The cover 20 has a third guide hole 24 corresponding to the first guide hole 16a of the first bracket 16 on one side thereof, and is formed in the first and second holes 16b and 16c, respectively. Corresponding first and second through holes 24 and 25 are formed, respectively. In addition, the cover 20 is formed with a fourth guide hole 27 corresponding to the second guide hole 18a of the second bracket 18, and corresponding to the fourth and fifth holes 18b and 18c, respectively. Third and fourth through holes 28 and 29 are formed, respectively.

The shutter driver 30 includes an electromagnet 31, a driving arm 35, and a magnetic 37.

The electromagnet 31 includes a bobbin 32 and a coil 33. The bobbin 32 is formed in a U shape so that the magnetic field forms a closed loop, and one end 32a and the other end 32b are disposed adjacent to the magnetic 37 and roughly correspond to the rotation radius of the magnetic 37. It is formed to have a curvature. In this way, as both ends 32a and 32b of the bobbin 32 are disposed to be adjacent to one end of the magnetic 37, current is applied to the coil 33 of the electromagnet 30 so that both ends 32a and 32b are provided. When different magnetic poles are generated at the same time, the magnetic field is formed as a loop as a whole, and unlike in a distributed magnetic field, the magnetic field is prevented from weakening due to less external leakage and interference of the magnetic field.

On the other hand, both ends (32a, 32b) of the bobbin 32 is a portion where different magnetic poles are generated, the interval and the length between the two ends (32a, 32b) the length of the magnetic 37 and the rotation angle of the magnetic 37 It is desirable to manufacture in consideration of.

The coil 33 is wound on one side of the bobbin 32 and is simultaneously transferred to both ends 32a and 32b of the bobbin 32 by transferring one-way or reverse current transmitted through the FPCB (not shown) to the bobbin 32. It generates different magnetic poles, that is, magnetic fields of the north pole and the south pole.

The driving arm 35 has an axle 36a which is a rotation center of the driving arm 35 on one side, and a connecting protrusion 36b for pivotally driving the first and second shutters 40 and 50 on the other side. It is provided. The connecting projection 36b is slidably inserted into the first and second long holes 43 and 53 of the first and second shutters 40 and 50. In this case, the distance between the shaft projection 36a and the connection projection 36b is preferably set in consideration of the angle at which the first and second shutters 40 and 50 can completely open and close the light transmission hole H. Do.

The magnetic 37 is made of a bar magnet, and different magnetic poles are magnetized on opposite sides of the bobbin 32 and adjacent to the opposite ends 32a and 32b, respectively. In this embodiment, the N pole is magnetized on the side adjacent to both side ends 32a and 32b, and the S pole is magnetized on the opposite side (see Fig. 5).

The first shutter 40 includes a first fixing hole 41 and a first long hole 43. In the first fixing hole 41, a shutter rotation shaft 15, which is a rotation center of the first shutter 40, is hingedly inserted, and the driving arm 35 of the shutter driver 30 is inserted into the first long hole 43. When turning, the connecting protrusion 36b for turning the first shutter 40 in the same direction as the turning direction of the driving arm 35 is slidably inserted. In this case, the first long hole 43 is formed in a portion adjacent to the first fixing hole 41.

The second shutter 50 is disposed opposite the first shutter 40, and includes a second fixing hole 51 and a second long hole 53 like the first shutter 40. In this case, the shutter rotation shaft 15 inserted into the first fixing hole 41 is inserted into the second fixing hole 51 so as to be hinged, and the driving inserted into the first long hole 43 into the second long hole 53. The connecting projection 36b of the arm 35 is slidably inserted. The second long hole 53 is formed in a portion adjacent to the second fixing hole 51.

The first and second side parts 45 and 55 of the first and second shutters 40 and 50 facing each other overlap each other when the light transmission hole H is closed, and light each other when the light transmission hole H is opened. It is positioned in a spaced apart state to the position to escape the outside of the through-hole (H). Meanwhile, in the present embodiment, the first and second side parts 45 and 55 are manufactured in a substantially straight shape. However, the present invention is not limited thereto, and the first and second side parts 45 and 55 are formed in a groove shape having a diameter equal to or larger than the diameter of the light transmission hole H. Of course it is possible. This is to allow the first and second sides 45 and 55 to completely open the light transmitting holes H in a state coinciding with the circumference of the light transmitting holes H. In this regard, the first and second shutters 40 and 50 properly set the lengths of the first and second long holes 43 and 53 so that the first and second side parts 45 and 55 are formed by the light transmission holes H. The angle of rotation can be limited to a state consistent with the circumference of the circle.

The filter blade driver 60 has the same configuration as the shutter driver 50. That is, the filter blade drive unit 60 includes an electromagnet 61, a drive arm 65 and a magnetic 67.

The electromagnet 61 includes a bobbin 62 and a coil 63. The bobbin 62 has a U-shape so that the magnetic field forms a closed loop, and one end 62a and the other end 62b are disposed adjacent to the magnetic 67 and roughly correspond to the rotation radius of the magnetic 67. It is formed to have a curvature.

The coil 63 is wound on one side of the bobbin 62 and is simultaneously transferred to both ends 62a and 62b of the bobbin 62 by transferring one-way or reverse current transmitted through the FPCB (not shown) to the bobbin 62. It generates different magnetic poles, that is, magnetic fields of the north pole and the south pole.

The driving arm 65 has a shaft projection 66a on one side, which is a rotation center of the driving arm 65, and a connecting projection 66b for pivotally driving the first and second shutters 40 and 50 on the other side. It is provided. The connecting protrusion 66b is slidably inserted into the first and second long holes 43 and 53 of the first and second shutters 40 and 50.

The magnetic 67 is made of a bar magnet, and different magnetic poles are provided on the side adjacent to both side ends 62a and 62b of the bobbin 62 and the opposite side to the side adjacent to both side ends 62a and 62b of the bobbin 62, respectively. It is magnetized.

The filter blade 70 includes a filter portion 71 and a pair of reinforcing blades 73a and 73b. The filter unit 71 is composed of an ND (Neutral Denstiy) filter, and the ND filter absorbs all wavelengths of light equally to reduce the intensity of the light, thereby reducing the amount of light transmitted through the light transmission hole (H). Can be reduced. In addition, the filter unit 71 may reduce the exposure to one stop (ND2), two stops (ND4) or four stops (ND8) according to the concentration of the ND filter. That is, since ND2 transmits only 50% of light, ND4 transmits 25%, and ND8 transmits 12.5%, respectively, it is of course possible to adjust the amount of light according to the concentration selection of the filter unit 71 to be applied.

In addition, a pair of reinforcing blades (73a, 73b) is attached to surround a portion of the filter portion 71 on both sides. In this case, the filter blade 70 prevents the filter portion 71 from rubbing against the adjacent structure when the swing blade is driven, thereby preventing a change in the light transmittance of the filter portion 71 due to the scratch. .

Due to the flexible material of the filter portion 71 to prevent bending to one side.

Furthermore, the filter blade 70 has a third fixing hole 75 and a third long hole 77. The filter blade rotation shaft 17, which is the rotation center of the filter blade 70, is hingedly inserted into the third fixing hole 75, and the driving arm 65 is pivoted in the third long hole 77 when the driving arm 65 is pivoted. The connecting projection 66b for pivoting the filter blade 70 in the same direction as the turning direction of is slidably inserted. In this case, the third long hole 77 is disposed at a portion adjacent to the third fixing hole 75.

Meanwhile, the second plate 80 may filter the first and second shutters 40 and 50 and the filter to prevent interference between the first and second shutters 40 and 50 and the filter blade 70. Disposed between the blades 70 to isolate the first and second shutters 40 and 50 and the filter blade 70 from each other. The second plate 80 has a plurality of fixing holes 83 through which the plurality of fixing protrusions 13 of the base pass, and has a light transmitting hole formed in each of the first plate 11 and the cover 20 at the center thereof. Another light transmission hole H corresponding to (H) is formed.

Referring to Figures 3 to 7 the operation of the camera shutter device according to an embodiment of the present invention configured as described above are as follows.

3, 4, and 7 illustrate a shutter apparatus for a camera in which the cover 20 is omitted so that the operating states of the first and second shutters 40 and 50 and the filter blade 70 can be clearly understood. 5 is a schematic view illustrating a shutter driver in a state in which the first and second shutters close the light transmission holes as shown in FIG. 3, and FIG. 6 is a light transmission hole as shown in FIG. 4. 7 is a schematic view showing a shutter driving unit in an open state, and FIG. 7 is a plan view showing a state in which the optical fiber is overlapped with a filter blade of a shutter device for a camera according to an embodiment of the present invention.

Referring to FIG. 3, the camera shutter device may, for example, turn on a camera (not shown) or, in the case of a mobile phone (not shown) having a built-in camera, set to a photographing mode, a light transmitting hole (H). The first and second shutters 40 and 50 are completely closed to obtain an initial state in which the film or charge-coupled device (CCD) is not exposed to light. In this state, when the shutter button (not shown) is pressed for taking a picture, the first and second shutters 40 and 50 are instantaneously turned to open the light transmitting hole H as shown in FIG. 4.

Hereinafter, the process of switching from the closed state of the light transmission hole H (see FIG. 3) to the open state of the light transmission hole H (see FIG. 4) will be described in more detail.

3 and 5, in a state in which the light transmitting hole H is closed by the first and second shutters 40 and 50, a current in one direction is applied to the coil 33 of the electromagnet 31 to bobbins. When the magnetic field of the N pole is formed at one end 32a of the 32 and the magnetic field of the S pole is simultaneously formed at the other end 32b, the magnetic 37 facing the one end 32a of the bobbin 32 is formed. The repulsive force acts between the N poles so that the driving arm 35 pivots a predetermined angle counterclockwise about the shaft projection 36a.

Subsequently, an attractive force acts between the N pole of the magnetic 37 and the other end 32b while rotating to the other end 32b of the bobbin 32 in which the S pole is formed in the counterclockwise direction by the rotational force of the driving arm 35. The drive arm 35 pivots to the maximum rotation angle.

As the driving arm 35 rotates in the counterclockwise direction as described above, the connecting projection 36b of the driving arm 35 is formed by the first and second long holes 43, of the first and second shutters 40 and 50. Sliding along 53). Accordingly, the first shutter 40 rotates counterclockwise with respect to the shutter rotation shaft 15, and at the same time, the second shutter 50 pivots clockwise with respect to the shutter rotation shaft 15, so that the first and second sides are rotated. The light transmission holes H are opened while being spaced apart so that the 45 and 55 are positioned about the light transmission holes H.

Subsequently, a process of closing the light transmitting hole H by the shutter driver 30 by the first and second shutters 40 and 50, that is, the process of switching from FIG. 3 to FIG. 4 will be described.

When a current is applied to the coil 33 of the electromagnet 31 in the opposite direction when the light transmitting hole H is opened, as shown in FIG. 6, the magnetic field of the S pole is formed at one end 32a of the bobbin 32. Is formed, and the magnetic field of the N pole is simultaneously formed at the other end 32b. Accordingly, the repulsive force acts between the N pole of the magnetic 37 and the other end 32b of the bobbin 32 so that the driving arm 35 pivots clockwise about the axle 36a. Subsequently, the driving arm 35 rotates clockwise to be adjacent to one end 32a of the bobbin 32 in which the S pole is formed, and the attraction force acts between the N pole and the one end 32b of the magnetic 37. The drive arm 35 pivots in the formulary direction up to the maximum rotation angle.

As the driving arm 35 rotates in the clockwise direction as described above, the connecting projection 36b of the driving arm 35 causes the first and second long holes 43 and 53 of the first and second shutters 40 and 50. Sliding movement along the) and accordingly, the first shutter 40 pivots clockwise relative to the shutter rotation axis 15 and at the same time the second shutter 50 pivots counterclockwise relative to the shutter rotation axis 15. Thus, the light transmission hole (H) is closed.

Thus, the shutter device according to the embodiment of the present invention, the N pole and the S pole at both ends 32a and 32b of the bobbin 32 adjacent to the N pole of the single magnetic 37 through the ultra-small shutter drive unit 30. As the sequential switching is performed, attraction force and repulsive force are alternately generated between the both ends 32a and 32b of the bobbin 32 and the N pole of the magnetic 37 to operate the driving arm 35 at high speed.

On the other hand, the filter blade driving unit 60 is selectively operated by the user according to the brightness of the place to take a picture. The process of opening and closing the light transmission hole H through the filter blade driver 60 through the filter blade 70 may include operations of the shutter driver 30 driving the first and second shutters 40 and 50. The same is done. That is, the driving arm 65 is clockwise driven by the magnetic 67 magnetized by alternating different magnetic poles on the bobbin side ends 62a and 62b of the electromagnet 61 and responding thereto. And it is possible to open and close the light transmission hole (H) by interlocking the filter blade 70 while turning counterclockwise.

As such, when the filter blade 70 is used, the filter blade driver 60 as shown in FIG. 7 is closed in the state where the light transmission hole H is closed by the first and second shutters 40 and 50. After turning the filter blade 70 to close the light transmission hole (H), the first and second shutters (40, 50) are simultaneously rotated through the shutter driver 30 to make the light transmission hole (H) Photographs can be taken by opening and closing again.

As described above, the present invention is capable of taking pictures for more diverse production by employing the filter blade 70 that can obtain a light reduction effect, and also minimizes the size of the shutter device while maintaining the driving performance of the shutter. I can make it.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

1 is a perspective view showing a shutter device for a camera according to an embodiment of the present invention,

2 is an exploded perspective view showing a shutter device for a camera according to an embodiment of the present invention;

3 is a plan view showing a state in which a light transmitting hole of a shutter device for a camera according to an embodiment of the present invention is closed by a pair of shutters;

4 is a plan view showing an open state of a light transmitting hole of a shutter device for a camera according to an embodiment of the present invention by a pair of shutters;

5 is a schematic view showing a shutter driver in a state in which the shutter closes the light transmission hole as in FIG. 3;

6 is a schematic view showing a shutter driver in a state in which the shutter opens the light transmission hole as in FIG. 4;

FIG. 7 is a plan view illustrating a state in which the light transmission hole is overlapped with the filter blade of the shutter device for a camera according to an exemplary embodiment of the present invention.

* Explanation of Signs of Major Parts in Drawings *

10: base 20: cover

30: shutter driver 40: first shutter

50: second shutter 60: filter blade driving unit

70: filter blade

Claims (6)

A base having a light transmitting hole (H) for passing light to expose a film or a charge-coupled device (CCD); A shutter driver disposed at one side of the base; First and second shutters each of which is pivotally connected to the base and connected to a part of the shutter driver to open and close the light transmission hole H in conjunction with an operation of the shutter driver; A filter blade driving unit disposed at the other side of the base; And, A filter blade having one end pivotably connected to the base and connected to a portion of the filter blade driving unit to open and close the light transmission hole H in conjunction with an operation of the filter blade driving unit. Shutter device. The shutter device for a camera according to claim 1, wherein the filter blade is formed of an ND (Neutral Denstiy) filter to open and close the light transmission hole (H). The shutter device of claim 2, wherein the filter blade is attached with at least one reinforcement blade to reinforce the strength of the rotation center portion. The method of claim 2, wherein the shutter drive unit, An electromagnet mounted on one side of the base; A driving arm disposed on one side of the electromagnet on the base and rotatably installed on the base; And, A magnetic body installed on the driving arm and having opposite magnetic poles magnetized on one surface opposite to both ends or the surface facing the electromagnet; The driving arm operates the first and second shutters while turning clockwise and counterclockwise by the attractive force and the repulsive force generated between the electromagnet and the magnetic according to the direction of the electric current imparted to the electromagnet, The electromagnet is composed of a bobbin and a coil wound on the bobbin, and the bobbin has a shutter device for a camera, characterized in that both ends of the magnetic field of different poles are disposed adjacent to the magnetic at the same time. The method of claim 2, wherein the filter blade drive unit, An electromagnet mounted on the other side of the base; A driving arm disposed on one side of the electromagnet on the base and rotatably installed on the base; And, A magnetic body installed on the driving arm and having opposite magnetic poles magnetized on one surface opposite to both ends or the surface facing the electromagnet; The driving arm operates the filter blade while turning clockwise and counterclockwise by the attraction force and the repulsive force generated between the electromagnet and the magnetic according to the direction of the electric current imparted to the electromagnet, The electromagnet is composed of a bobbin and a coil wound on the bobbin, and the bobbin has a shutter device for a camera, characterized in that both ends of the magnetic field of different poles are disposed adjacent to the magnetic at the same time. The method according to claim 4 or 5, The bobbin is a U-shape so that the magnetic field generated in the electromagnet forms a closed loop, both ends are arranged horizontally at intervals with respect to the turning direction of the drive arm.

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