KR20070013599A - Iris apparatus having function of shutter - Google Patents

Abstract

An iris device having a shutter function is provided to perform the accurate control of a small diameter when an object is photographed in the daytime by selectively setting a light receiving quantity according to a photographing time zone and the brightness of a place through an iris and overcoming mechanical tolerance generated according to the operation of a shutter. A light receiving quantity setting unit(300) sets a large or small light receiving quantity mode. The first and the second drive coils for driving a pair of shutters are wound on an inner circumference surface of a ring yoke of an electromotive part(23) in a bobbin. A multi-pole magnetized permanent magnet is rotatably inserted into the center of the bobbin. A pair of the shutters are driven by the magnetic force of the multi-pole magnetized permanent magnet, and an opening and closing operation is performed by a plurality of stages in response to the setup of the large or small light receiving quantity mode set up by the light receiving quantity setting unit(300).

Description

Iris Apparatus having Function of Shutter

1 is a schematic perspective view showing an aperture device having a shutter function installed in a barrel of a conventional camcorder;

2 is an exploded perspective view showing a conventional aperture,

3A is a cross-sectional view taken along the line A-A shown in FIG. 2;

3B is a cross-sectional view taken along line B-B shown in FIG. 2;

4A and 4B are schematic views showing a driving state of a conventional aperture;

5A is a perspective view illustrating an aperture device having a shutter function according to an embodiment of the present invention;

5B is a block diagram illustrating a light receiving amount setting unit connected to a control unit for selectively setting a light receiving amount;

6A is a cross-sectional view taken along the line C-C shown in FIG. 5A,

6B is a cross-sectional view taken along the line D-D shown in FIG. 5A,

7A to 7C are schematic views showing a driving state of an aperture device according to an embodiment of the present invention;

8a to 8c is a perspective view and a front view showing an aperture device according to another embodiment of the present invention,

9A to 9C are schematic views showing a driving state of the aperture device according to another embodiment of the present invention.

＊ Explanation of symbols on the main parts of the drawings

12,100: base plate 12a, 100a: light transmitting hole

13: groove 23: electric drive

24: Ring York 26: Bobbin

28: permanent magnet 30a: the first drive coil

30b: 2nd drive coil 120,220: 1st shutter

122,132: long hole 124,224: light transmission groove

126a, 136a, 228a, 238a: contact protrusion 134,234: large diameter light transmitting hole

226: first small diameter light transmitting hole 236: second small diameter light transmitting hole

300: light receiving amount setting unit

The present invention relates to an aperture device, and in particular, the shutter and the aperture can be precisely driven through a single electric drive, and the shutter can be driven precisely. An aperture device having a shutter function capable of precise control of an aperture.

With the development of digital technology, a variety of products incorporating camera functions have been released for mobile communication terminals or digital camcorders. Especially, the aperture unit of the camera unit implemented in such a small device always does not distinguish between dark and bright places when shooting. It is also equipped with a shutter function to enable clear picture quality and high quality pictures while maintaining this state.

The aperture device 10 having the conventional shutter function is installed between the lens barrel 2 and the barrel master 4 as shown in FIG. 1. In addition, the aperture device includes a base plate 12 having a light projection hole 12a formed on the bottom surface of the diaphragm 12 and first and second shutters 14 linearly moving in opposite directions from the top surface of the base plate 12. , 16) and a driver 23 for driving the first and second shutters 14 and 16.

A plurality of guide protrusions 12b protrude from both sides of the base plate 12, and guide holes 14a and 16a formed at both sides of the first and second shutters 14 and 16 are slidably coupled to the guide protrusions 12b. A cover 18 having a pair of arc holes 18a is attached to the base plate 12 to prevent the first and second shutters 14 and 16 from being separated.

An arm lever 20 is rotatably mounted on an upper surface of the base plate 12, and both ends of the arm lever 20 are fitted with long holes 14b and 16b provided at both ends of the first and second shutters 14 and 16. The fitting projections 20a protrude from each other, and a stopper 22 for controlling the rotation of the second movable plate 16 protrudes from one end of the base plate 12.

The drive unit 23 is wound around the cylindrical ring yoke 24 coupled to the base plate 12 and the bobbin 26 attached to the inner peripheral surface of the ring yoke 24, the drive coil 30 is wound, the permanent magnet 28 Is magnetized to anisotropy (N, S).

A permanent magnet 28 is installed on the inner circumferential surface of the bobbin 26, and a rotor shaft 28a having one end coupled to the arm lever 20 is press-fitted in the center of the permanent magnet 28.

In the conventional diaphragm 10 configured as described above, the guide holes 14a and 16a of the first and second movable plates 14 and 16 are fitted into the guide protrusions 12b of the base plate 12, The cover 18 is coupled to the upper portion of the base plate 12 in a state where the fitting protrusions 20a of the arm lever 20 are respectively inserted into the long holes 14b and 16b of the second shutters 14 and 16. At this time, a portion of the fitting protrusion 20a protrudes into the arc hole 18a formed in the cover 18.

The operation state of the diaphragm 10 assembled as described above will be described with reference to FIGS. 3A to 4B.

The opening operation of the first and second shutters 14 and 16 is an operation of reaching incident image light passing through a zoom lens (not shown) to the imaging surface. That is, when the power is applied to the drive coil 30 wound on the bobbin 26, as the permanent magnet 28 rotates counterclockwise by the magnetic field generated in the drive coil 30 as shown in Figure 4b The arm lever 20 rotates while 28a rotates in one direction.

Accordingly, the incident light passing through the zoom lens reaches the imaging surface as the first and second shutters 14 and 16 linearly move in opposite directions to open or close the light projection hole 12a of the base plate 12. Done. At this time, one end of the arm lever 20 is in contact with the stopper 22, the opening operation of the first and second shutters (14, 16) is completed, the torsion spring (36) interposed on one end of the rotor shaft (28a) is Keep compressed.

On the other hand, the closing operation of the iris, when the current is gradually reduced by the damping coil 32 by cutting off the power applied to the drive coil 30, the first and second shutters 14, 16 performing the opening operation is The closing operation is performed while sliding along the guide protrusion 12a of the base plate 12 by the restoring force of the compressed torsion spring 36.

Therefore, the conventional aperture device is basically provided with two actuators, that is, the electric drive 23 and the torsion spring 36 as described above to perform the function of the aperture and the shutter, the electric drive 23 is brightness adjustment For the aperture function, the torsion spring 36 is responsible for the shutter function.

However, such a conventional diaphragm device has a complicated structure by using two actuators, and the first and second shutters 14 and 16 operate depending on the elastic force of the torsion spring 36. When the elastic force of 36) is lowered, the operating speed of the first and second shutters is affected.

As a result, it is difficult to implement accurate shutter operation, which makes it difficult to take a desired resolution, for example, a high quality picture.

In addition, since the amount of light received on the imaging surface through the aperture cannot be selectively set according to the shooting time and the brightness of the place, a certain amount of light is always received regardless of the brightness, so an appropriate contrast cannot be expressed. Precise shooting did not work properly.

An object of the present invention for solving the above problems is to provide an aperture device having a shutter function capable of precisely driving the shutter while simultaneously performing the shutter and the aperture function through a single transmission.

In addition, another object of the present invention is to selectively set the light receiving amount according to the brightness of the shooting time zone and place through the aperture, and also to precisely control the small diameter during daytime shooting by overcoming the mechanical tolerance caused by the shutter operation The present invention provides an aperture device having a shutter function.

In order to achieve the above object, the present invention provides a driving force to the base plate, a pair of shutters and a pair of shutters to simultaneously adjust the amount of light while simultaneously moving in the opposite direction from the upper surface of the base plate and a shutter function; An aperture device including a ring yoke having a permanent magnet inserted therein, the apparatus comprising: a light receiving amount setting unit for setting a large or small amount light receiving mode; A bobbin in which first and second drive coils are wound around the ring yoke to drive the pair of shutters; And a multi-pole magnetized permanent magnet rotatably inserted in the center of the bobbin, wherein the pair of shutters are driven by the magnetic force of the multi-pole magnetized permanent magnet, and a plurality of steps are received by the light receiving amount setting unit in a plurality of steps. According to an aspect of the present invention, there is provided an aperture device, which performs opening and closing operations.

The first shutter has a large diameter light transmission hole having a diameter equal to or smaller than the light transmission hole of the base plate with the same center as the center of the light transmission hole of the base plate, and the second shutter is provided at the bottom of the large diameter light transmission hole. A recess having a corresponding diameter can be provided to transmit light corresponding to a preset light receiving amount.

In addition, the first shutter has a large diameter light transmitting hole having a diameter equal to or smaller than that of the light transmitting hole of the base plate and having the same center as that of the light transmitting hole of the base plate, and the center of the shutter movement direction of the large diameter light transmitting hole. And a first small diameter light transmitting hole having a diameter smaller than that of the large diameter light transmitting hole and formed adjacent to the large diameter light transmitting hole at the same center, wherein the second shutter has a diameter corresponding to the first small diameter light transmitting hole. It is provided with a second small diameter light transmission hole having a recess having a diameter corresponding to the large diameter light transmission hole at the bottom, it is possible to transmit the light corresponding to the preset light receiving amount.

Since the first and second small diameter light transmitting holes have a diameter larger than that of the other light transmitting hole, the first and second small diameter light transmitting holes can transmit constant light in the light receiving mode.

The light receiving amount setting unit may be set automatically by using an optical sensor when setting the mass light receiving mode or the small amount light receiving mode, or manually by using a selection switch.

The permanent magnet is magnetized to any one of 6 and 6 or more even numbers. In this case, the first and second drive coils are preferably disposed in consideration of the number of magnetized poles of the permanent magnet.

The first drive coil is disposed at the same time adjacent to one of the plurality of poles magnetized in the permanent magnet and adjacent to each other, the second drive coil is a boundary between the poles and the poles magnetized in the permanent magnet Simultaneously placed adjacent to the pole and the boundary of the pole.

Preferably, the first and second shutters respectively form contact protrusions that slidably protrude in a state in which the first and second shutters are in contact with the inner side of the base plate, respectively, so as to enable accurate vertical movement during linear movement.

Therefore, the present invention as described above, it is possible to implement the aperture and the shutter function using a pair of shutters through a single actuator, it is possible to reduce the manufacturing cost while simplifying and miniaturizing the overall structure.

In addition, by selectively setting the amount of light received according to the brightness of the shooting location, you can take a more precise picture of the subject, and by forming a light transmission hole, it is possible to precisely photograph the subject by always transmitting a constant amount of light in the small light receiving mode. Do.

Hereinafter, a configuration of an aperture device having a shutter function according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

5A is a perspective view illustrating an aperture device having a shutter function according to an exemplary embodiment of the present invention, and FIG. 5B is a block diagram illustrating a light receiving amount setting unit for selectively setting a light receiving amount connected to a control unit. It is sectional drawing shown along the CC line shown in FIG. 6B, and FIG. 6B is sectional drawing shown along the DD line shown in FIG. 5A.

In the aperture device according to the exemplary embodiment of the present invention, the arm lever 20 is disposed on the recess 13 of the upper surface of the base plate 12 so that the arm lever 20 can be rotated in one direction or in a reverse direction about the rotor shaft 28a described later.

In addition, the first and second shutters 120 and 130, each of which has a distal end coupled to both ends of the arm lever 20, may be interlocked with each other as the arm lever 20 pivots a predetermined angle in one direction or in the opposite direction. It is installed to move linearly.

In this case, transverse long holes 122 and 132 are formed at the ends of the first and second shutters 120 and 130, respectively, and protruding portions are formed at both ends of the arm lever 20 to prolong the long holes 122 and 133, respectively. The fitting protrusion 20a is coupled to be slidable.

In addition, the first shutter 120 has a light transmission recess 124 having a diameter smaller than or equal to the diameter of the light transmission hole 12a of the base plate 12. In addition, the first shutter 120 has contact protrusions 126a protruding in a sliding manner in contact with the inside of the base plate 12 on both sides.

The second shutter 130 has a large diameter light transmission hole 134 having a diameter corresponding to the light transmission groove 124 at the same center as the center of the light transmission hole 12a of the base plate 12. In addition, as in the first shutter 120, the second shutter 130 is provided with contact protrusions 126a protruding from both sides of the second shutter 130 in a state of being in contact with the inside of the base plate 12.

 The first and second shutters 120 and 130 may be accurately moved vertically when linearly moved in a state in which they are coupled to the base plate 12 by the contact protrusions 126a and 136a. 124, the centers of the light transmission hole 134 and the light transmission hole 12a are accurately centered with each other so that a constant mass light reception is always performed.

In this case, the light transmitting recess 124 and the large-diameter light transmitting hole 134 of the first shutter 120 have a diameter of approximately the same size.

On the other hand, the transmission unit 23, as shown in Figure 6a and 6b, the ring yoke 24 coupled to one side of the base plate 12, the bobbin 26 fixed to the inner peripheral surface of the ring yoke 24, and the bobbin ( 26 is provided with a permanent magnet 28 rotatably disposed in the center, and first and second drive coils 30a and 30b wound around the bobbin 26, respectively. In this case, the permanent magnet 28 is the rotor shaft 28a is coupled to the center of the arm lever 20 is pressed in the center.

The permanent magnet 28 is magnetized into a multi-pole, for example, six poles as shown in Figure 6a, the first drive coil (30a) is a pole of any one of the plurality of poles magnetized in the permanent magnet 28 The second drive coils 30b are simultaneously disposed adjacent to each other, and the second drive coils 30b are simultaneously disposed adjacent to a boundary between a plurality of poles and poles magnetized in the permanent magnet 28 and a boundary between adjacent poles and poles.

In one embodiment according to the present invention, the permanent magnet 28 is magnetized to 6 poles, but is not limited to this, it is also possible to use a permanent magnet magnetized in any one of the six or more even number, wherein the first and the first The two drive coils are preferably placed in the proper positions in consideration of the number of magnetized poles of the permanent magnet.

In addition, the aperture device according to an embodiment of the present invention includes a light receiving amount setting unit 300 connected to an input terminal of the controller 400 to selectively set the light receiving amount according to the brightness of the shooting time zone and the place when the photographing is performed.

The light receiving amount setting unit 300 automatically sets the light receiving mode by using a known optical sensor when setting the mass receiving mode or the small amount receiving mode, or the user sets manually before taking a picture using a selection switch. In addition, the control unit 400 processes the signal received through the light receiving amount setting unit 300, and controls the transmission unit 23 electrically connected through the output terminal of the control unit 400.

Reference numeral 18 in FIG. 5A denotes a cover, and 18a denotes an arc hole.

The operation of the aperture device having the shutter function according to the present invention configured as described above will be described in detail with reference to FIGS. 7A to 7C. 7A to 7C are schematic views illustrating a driving state of an aperture device according to an embodiment of the present invention.

First, after setting the light receiving mode setting unit 300 in the mass receiving mode, and applying a forward DC power supply to the first drive coil 30a, the permanent magnet 28 set at a random angle is the same as that of FIG. 7B. When the DC power applied to the first drive coil 30a is interrupted and the reverse DC power is applied to the second drive coil 30b at the same time, the permanent magnet 28 is in an initial state as shown in FIG. 7A. Is located.

In this initial state, when forward DC power is applied to the first drive coil 30a, the six-pole magnetized permanent magnet 8 rotates in a counterclockwise direction, and the arm lever 28a is linked to the permanent magnet 28. The first and second shutters 120 and 130 are moved in opposite directions while rotating at the same rotation angle as).

In this case, the arm lever 20 is set in a substantially horizontal state, and in this state, the DC power applied to the first drive coil 30a is cut off and the forward DC power is supplied to the second drive coil 30b. 7C is applied to set the permanent magnet 28 at an angle as shown in FIG. 7C. At this time, the second drive coil 30b and the six-pole magnetized permanent magnet 28 are balanced with each other, and stop rotation any more. .

The arm lever 20, which interlocks with the permanent magnet 28, continues to rotate in a rotational direction, so that the light penetrating groove 124 of the first shutter 120 and the large diameter light penetrating hole 134 of the second shutter 130 are rotated. ) And the center of the light transmitting hole 12a of the base plate 12 coincide with each other, and a hole L capable of receiving a large amount of light is set.

The aperture device according to an embodiment of the present invention performs the aperture function as described above to reach the image pickup surface with the incident light, and then performs the shutter function.

In order to perform the shutter function, when the power applied to the second drive coil 30b is cut off and the forward DC power is applied to the first drive coil 30a in FIG. 7C, the six-pole magnetized permanent magnet ( 28 rotates clockwise, and in conjunction with this, the arm lever 20 also rotates the same angle clockwise.

When the permanent magnet 28 is rotated and positioned at the same angle as that of FIG. 7B, the power applied to the first drive coil 30a is cut off and a reverse DC power is applied to the second drive coil 30b to provide the same power as that of FIG. 7A. Rotate the permanent magnet 28 to the same position. Accordingly, the permanent magnet 28 is in balance with the second drive coil (30b) of the force can no longer rotate and stop.

Therefore, the first and second shutters 120 and 130 linearly move in opposite directions to close the light transmission hole 12a as shown in FIG. 7A to perform a shutter function.

On the other hand, when the small amount light receiving mode is set through the light receiving amount setting means 300, when the forward DC power is applied to the first drive coil 30a in the initial state, the six-pole magnetized permanent magnet 8 is counterclockwise. Direction and the arm lever 28a rotates at the same rotation angle as the permanent magnet 28 to move the first and second shutters 120 and 130 in opposite directions.

In this case, the arm lever 20 is set in a substantially horizontal state, where the first drive coil 30b and the six-pole magnetized permanent magnet 28 are equal to each other and cannot rotate any more. Will stop.

The arm lever 20 which interlocks with the permanent magnet 28 continues to rotate in the rotational direction so that the first and second shutters 120 and 130 move linearly to allow the light penetrating groove 124 and the large diameter light penetrating hole 134. Are intersected and holes S are formed that can receive a small amount of light in the portions corresponding to the intersections.

In this case, the hole S is approximately positioned at the center of the light transmission hole 12a of the base plate 12 to reach a small amount of incident light to the imaging surface, thereby performing an aperture function and then performing a shutter function. .

In order to perform the shutter function, the power applied to the first drive coil 30a is cut off and the reverse DC power is applied to the second drive coil 30b in the state as shown in FIG. 7B. Rotate 28). Accordingly, the permanent magnet 28 is in balance with the second drive coil (30b) of the force can no longer rotate and stop.

Therefore, the first and second shutters 120 and 130 linearly move in opposite directions to close the light transmission hole 12a as shown in FIG. 7A to perform a shutter function.

As described above, in one embodiment of the present invention, when shooting in a bright or dark place, the light receiving amount may be selectively set, and thus, the image may be photographed with high precision.

In addition, although one embodiment according to the present invention has been described as having the six-pole magnetized permanent magnet, when the magnet of the permanent magnet magnetized into an 8-pole, 10-pole, even number of multi-pole even more multi-stage aperture Location is possible.

8A to 8C are a perspective view and a front view illustrating an aperture device according to another embodiment of the present invention, and FIGS. 9A to 9C are schematic views illustrating a driving state of the aperture device according to another embodiment of the present invention.

In the aperture device according to another embodiment of the present invention, the photographing is performed by setting a large amount or a small amount of light receiving amount as in the embodiment of the present invention. However, in the exemplary embodiment, mechanical tolerances occur according to the operation of the first and second shutters 120 and 130 or the processing of parts.

Such mechanical tolerances make it difficult to always maintain a constant area of the small-diameter hole S formed by the first and second shutters 120 and 130 operating up and down under the small light receiving mode, thereby making it accurate in the small light receiving mode. It can solve the tough problem of taking high quality pictures.

The aperture device according to another embodiment of the present invention is the same as that of the embodiment, except that the first and second small-diameter light transmitting holes 226 and 236 formed in the first and second shutters 220 and 230 are formed. There is a difference in that.

The description of the configuration of another embodiment that is the same as the embodiment according to the present invention will be omitted.

As shown in FIG. 8B, the first shutter 220 includes a light transmitting groove 224 having the same diameter as that of the light transmitting hole 100a of the base plate 100 shown in FIG. 8A, and the light transmitting groove 224. The first small-diameter light transmission hole 226 is formed adjacent to the center and at the same time centered in the direction perpendicular to the center of the light transmission groove 224.

The second shutter 230 shown in FIG. 8C includes a large diameter light transmitting hole 234 having the same diameter as the light transmitting hole 100a of the base plate 100 shown in FIG. 8A, and has a large diameter light transmitting hole ( A second small diameter light transmission hole 236 formed adjacent to the center of the large diameter light transmission hole 234 and formed at the same time as the center of the large diameter light transmission hole 234 is formed.

Reference numerals 228a and 238a in FIGS. 8A and 8B denote contact protrusions, respectively.

Referring to the operation of the aperture device according to another embodiment of the present invention having the first and second shutters 220 and 230 as described above. In the operation description, the positions of the six-pole magnetized permanent magnets 28 driving in the mass or small light reception mode are positioned in the same manner as in the embodiment of the present invention as shown in FIGS. 7A to 7C, and the operation corresponding to this portion. Description is omitted.

In the initial state, that is, when the light transmission hole 100a of the base plate 100 is closed as shown in FIG. 9A, when the light receiving amount setting unit 300 is set to the large light receiving mode, driving of the electric motor 23 is performed. As shown in FIG. 9B, the first and second shutters 220 and 230 are linearly moved in opposite directions by the arm lever 20 so that the large-diameter light transmitting hole 234, the light transmitting groove 224, and the base plate 100 are moved. Match the centers of the light transmitting holes 100a with each other.

Accordingly, a large amount of light is received on the imaging surface through the hole L1 corresponding to the area of the light transmission hole 100a, and after performing the aperture function, the first and second shutters are again shown in FIG. 9A. 220 and 230 move linearly to perform a shutter function.

In addition, when the light receiving amount setting unit 300 is set to the small amount light receiving mode, the first and second shutters 220 and 230 are opposite to each other by the arm lever 20 as shown in FIG. 9C according to the driving of the electric motor 23. The centers of the first and second small-diameter light transmitting holes 226 and 236 coincide with each other. At this time, the first and second small-diameter light transmission holes 226 and 236 are positioned in the central portion of the light transmission hole 100a.

Accordingly, a small amount of light is received on the image pickup surface through the holes S1 corresponding to the areas of the first and second small diameter light transmitting holes 226 and 236 matched thereto, and after performing the aperture function again, FIGS. In the same state, the first and second shutters 220 and 230 move linearly to perform a shutter function.

In this case, in order to overcome the mechanical tolerance generated by the operation of the first and second shutters 220 and 230 under the small amount of light receiving mode, the first and second small diameter light transmitting holes 226 and 236 may have any diameter. It is preferred that it is formed somewhat larger than the diameter of the other one.

In the present invention described above, the aperture and the shutter function using a pair of shutters can be implemented together through a single actuator, and the overall structure can be simplified and downsized, and the manufacturing cost can be reduced.

In addition, by selectively setting the amount of light received according to the brightness of the shooting location, you can take a more precise picture of the subject, and by forming a light transmission hole, it is possible to precisely photograph the subject by always transmitting a constant amount of light in the small light receiving mode. Do.

The present invention is not limited to the above specific preferred embodiments, and any person skilled in the art may make various modifications without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims set forth.

Claims (8)

In order to provide driving power to the base plate, a pair of shutters that adjust the amount of received light while moving linearly in the opposite direction from the upper surface of the base plate, and at the same time the shutter function, and a pair of shutters, the permanent magnet In the diaphragm provided with an inserted transmission unit, A light receiving amount setting unit for setting a large or small amount light receiving mode; A bobbin in which first and second drive coils are wound around an inner circumferential surface of a ring yoke of the transmission unit to drive the pair of shutters; Includes; multi-pole magnetized permanent magnet rotatably inserted in the center of the bobbin, And driving the pair of shutters by the magnetic force of the multi-pole magnetized permanent magnet to perform the opening / closing operation corresponding to the setting of the large or small amount light receiving mode set by the light receiving amount setting unit in a plurality of steps. The shutter of claim 1, wherein any one of the pair of shutters has a large diameter light transmission hole having a diameter equal to or smaller than that of the light transmission hole of the base plate with the same center as the center of the light transmission hole of the base plate. One shutter is provided with a light transmitting groove having a diameter corresponding to the large diameter light transmission hole at the bottom. The method of claim 1, wherein any one of the pair of shutters having a large diameter light transmission hole having a diameter equal to or smaller than that of the light transmission hole of the base plate at the same center as the center of the light transmission hole of the base plate, A first small diameter light transmitting hole having a diameter smaller than that of a large diameter light transmitting hole formed adjacent to the large diameter light transmitting hole at the same center at the center of the shutter movement direction of the light transmitting hole; The other shutter has a second small diameter light transmission hole having a diameter corresponding to the first small diameter light transmission hole, and has a light transmission groove having a diameter corresponding to the large diameter light transmission hole at a lower end thereof. Aperture device characterized in that. The aperture device according to claim 3, wherein the first and second small diameter light transmitting holes have a diameter larger than that of the other one. The aperture device according to claim 1, wherein the light receiving amount setting unit is an optical sensor or a selection switch. The diaphragm according to any one of claims 1 to 3, wherein the permanent magnet is magnetized to any one of six poles and an even number. According to any one of claims 1 to 3, wherein the first drive coil is disposed at the same time adjacent to each other adjacent to one of the plurality of poles magnetized in the permanent magnet and the neighboring poles, the second drive coil is An aperture device, characterized in that the plurality of poles magnetized in the permanent magnet and the boundary line of the poles and the adjacent poles and the poles arranged adjacent to the boundary at the same time. According to any one of claims 1 to 3, wherein the first and the second shutter is a contact protrusion protruding slidably in contact with the inside of the base plate on both sides so as to enable accurate vertical movement during linear movement. An aperture device, characterized in that each provided.

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