JP2006033914A - Vane drive unit for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane drive unit for camera which enables the thinning of a motor component. <P>SOLUTION: A rotor 14, which has a permanent magnet 14a, is attached capably of rotation around the axis 1z of a bottom board 1, and it is so arranged as to rotate reciprocatively a throttle vane 6 by its output pin 14c. A roughly U-shaped yoke 11 is positioned by the depression 1e of the bottom board 1, in condition that a bobbin 13 whereon a coil 12 is wound is fitted, and for the bobbin 13, the shifting to the yoke 11 is regulated by the hole 1c of the bottom board 1. Then, for this bobbin 13, the condition that the hole provided in its protrusion 13c engages with the tip of the above axis 1z is kept by a covering plate 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera blade driving device in which shutter blades, diaphragm blades, and the like are driven by a motor.

  A lens shutter device (hereinafter simply referred to as a shutter device), a diaphragm device, and a filter device employed in a camera each have one or a plurality of blades. Most recent shutter devices for small cameras have two shutter blades and are reciprocally operated (rotated or rectilinearly) in opposite directions, but for mobile phones. For example, there is a camera that has only one shutter blade and is reciprocally rotated.

  In the case of a diaphragm device, a plurality of diaphragm blades are simultaneously rotated in the same direction, or two diaphragm blades are moved straight in opposite directions to continuously change the size of the diaphragm aperture. In the case of recent small cameras, there is a camera that rotates a diaphragm blade having a small circular opening so that it advances and retreats in the optical path of photography with the advent of digital cameras. It is increasing. In such a case, a plurality of aperture blades having different sizes of openings are also known, which are selectively advanced and retracted.

  Further, in the case of a filter device for a small camera, the shape is similar to the diaphragm blade having the circular opening described above (however, the opening is substantially the same size as the opening for the photographing optical path formed on the base plate). In many cases, filter blades are formed by attaching an ND filter plate at a position in the vicinity of the opening so as to cover the opening. There are also prepared ND filter plates with the same external shape as them between them, and the three members reciprocally rotated in the same direction at the same time as if they were one filter blade. It is also known that when there is no fear of scratching the surface of the ND filter plate, the filter blade is made of only one filter plate.

  Furthermore, each blade for such a small camera has recently been operated using a motor as a drive source. Since the motor is easy to miniaturize at a low cost, such as a moving magnet type motor. A so-called current-controlled motor is often used. The rotor of this type of motor has a cylindrical or columnar permanent magnet whose main body supported at the center of rotation is magnetized in two poles (or four poles) in the radial direction. In the radial position, there are one or two output pins integrated with the main body portion, and some of the output pins are made of permanent magnets. Such a rotor rotates in a direction corresponding to the energization direction to the stator coil only within a predetermined rotation angle range, and the blades are operated directly or indirectly by the output pins. ing.

  On the other hand, there are known various types of stators for this type of motor. One of them has a stator coil fitted into a substantially U-shaped yoke, and two magnetic poles. A configuration in which the portion is configured to face the peripheral surface of the rotor is known from Patent Document 1 below. Since this stator configuration is advantageous for reducing the dimension in the optical axis direction of the motor installation portion (hereinafter referred to as thinning) compared to the stator configuration of other moving magnet type motors, It is advantageous for use in a blade driving device of a thin digital camera including a camera for a portable information terminal device.

In addition, these shutter device, aperture device, and filter device may each be configured as a blade drive device alone, but as is well known, two or three of these devices are applied to one ground plane. In some cases, the component members are attached to form a unitary blade driving device, and each blade is operated by each motor. The present invention is a moving magnet type motor of the type having a substantially U-shaped yoke as described above as a stator, and is suitable for use in a small camera in which various blades described above are driven. The present invention relates to a driving device.
JP 2004-032873 A

  Incidentally, in the shutter device described in Patent Document 1 (hereinafter referred to as a conventional blade driving device), the base plate (base plate 10) forms a blade chamber between one surface and the cover plate (back plate 90). In addition, a motor chamber is formed between the other surface and the synthetic resin frame (bobbin and pressing member 50). And since the frame (bobbin and presser member 50) is a plate member for constituting a motor chamber between the base plate (base plate 10) and the bobbin of the coil (coil 60), It is a configuration that enables cost reduction while ensuring thinning of the device. Therefore, as long as this type of motor is employed, it seems that it is extremely difficult to make the device thinner and lower in cost.

  That is, from the viewpoint of thinning, in the case of the conventional blade driving device, the frame (bobbin and pressing member 50) is attached to the surface outside the blade chamber of the main plate (base plate 10). The tip of the shaft (support shaft 11) provided on the base plate (base plate 10) and fitted with the rotor (rotor 20) is fitted into the provided hole (fitting hole 52a). Therefore, if the frame (bobbin and presser member 50) is made too thin, something may hit or be pressed by something during production, transportation, etc., and the motor configuration may be damaged. It will be. Further, from the viewpoint of cost reduction, two screws (screws 70) are required to securely attach the frame (bobbin and presser member 50) to the main plate (base plate 10). It is difficult to reduce the number of parts.

  The present invention has been made to solve such problems, and the object of the present invention is to make it possible to further reduce the thickness of the motor component as compared with the conventional blade driving device as described above. The present invention provides a camera blade drive device having a configuration, and further provides a camera blade drive device that can reduce the cost of the motor component, and thus the entire device, if necessary. That is.

  In order to achieve the above object, a camera blade driving device of the present invention has a ground plate having an opening for a photographing optical path and an opening for the photographing optical path, and is attached to the ground plate. At least one blade chamber is formed between the cover plate and the cover plate, and at least one blade which is reciprocated by a driving means and advances and retreats to the opening is disposed in the blade chamber. The drive means has an output pin for reciprocating the blade, and is permanently attached to a shaft erected on the blade chamber side surface of the base plate. A hole formed in the base plate with a part of the coil disposed on the cover plate side of the base plate with the axial direction of the cylindrical portion around which the coil is wound and the cylindrical portion wound around the coil being parallel to the base plate And the base plate and the flat A bobbin in which a hole provided in the overhanging portion is fitted to the tip of the shaft, and a substantially U-shaped bobbin fitted with the cylindrical portion, and two magnetic pole portions And a yoke facing the peripheral surface of the rotor.

  In that case, the bobbin may be attached to the base plate in a state where a hole provided in the overhanging portion is fitted to the shaft, and the cover plate is attached to the overhanging portion. In order to maintain the fitted state between the provided hole and the shaft, the bobbin may be attached to the main plate while being pressed, but the latter configuration is more cost effective. It is advantageous.

  The present invention relates to a blade drive device using a current-controlled motor using a substantially U-shaped yoke fitted with a coil bobbin as a stator as a blade drive means, and the motor is disposed on the cover plate side of the main plate. Therefore, it is not necessary to make the overhang provided on the bobbin thick and sturdy in order to restrict the axial movement of the rotor. It is possible to make it thinner than the blade driving device. Also, the cover plate keeps the bobbin holding the fitting state between the tip of the shaft that is erected on the base plate and the rotor is rotatably fitted to the hole provided in the overhanging portion of the bobbin. In such a case, it is possible to eliminate the need for fixing means for the bobbin and the yoke to the ground plate, such as screw parts, and it is possible to reduce the cost.

  Embodiments of the present invention will be described with reference to the illustrated examples. In this embodiment, the shutter device and the aperture device are configured as a single unit, which can be adopted for both a silver salt film camera and a digital camera. Since it is considered that there is no need to explain, the case where it is adopted in a digital camera will be explained. 1 is a plan view of the photographing standby state in which the shutter blades are fully opened as viewed from the subject side, and FIG. 2 is a plan view of the same state as that in FIG. 1 as viewed from the solid-state imaging device side. FIG. 3 is a cross-sectional view for easily explaining the configuration of the main part, and FIG. 4 is a plan view of the state in which the shutter blades are closed as viewed from the solid-state imaging device side.

  First, the configuration of this embodiment will be described. The base plate 1 is made of synthetic resin, has a circular opening 1a for a photographing optical path, and inserts a part of bobbins 9, 13 which are constituent members of two motors to be described later. Two holes 1b and 1c having a substantially square shape are provided. And the surface at the side of the solid-state image sensor of this ground plane 1 is various uneven | corrugated shape, The shape is mentioned later. In addition, a cover plate 2 is attached to the ground plane 1 on the solid-state imaging device side, but in FIGS. 2 and 3, in order to make it easy to understand the members disposed between the ground plane 1 and the cover plate 2. The cover plate 2 is indicated by a two-dot chain line. The cover plate 2 is also formed with a circular opening 2a for the photographing optical path, and two arc-shaped long holes 2b and 2c are formed. However, only one spacer 2d is shown. In addition, a plurality of holes are formed in the cover plate 2, which will be described later together with a method for attaching the cover plate 2 to the base plate 1.

  An intermediate plate 3 made of a very thin material is disposed between the base plate 1 and the cover plate 2, and a blade chamber of shutter blades 4 and 5 described later is formed between the base plate 1 and the cover plate. 2 constitutes a blade chamber of a diaphragm blade 6 to be described later. The intermediate plate 3 has an opening 3a for a circular photographing optical path, and also has an oval hole 3b and a circular hole 3c. Although not shown in FIGS. 2 and 3, the cover plate 2 also has holes having the same shape as the holes 3b and 3c in a region facing them. Further, the opening 3a for the photographing optical path formed in the intermediate plate 3 is arranged so as to overlap the openings 1a and 2a formed in the base plate 1 and the cover plate 2, but is formed in the cover plate 2. The diameter of the opening 2a is the smallest to regulate the exposure opening.

  The base plate 1 has a hollow portion 1d formed in two stages for dropping rotors 10 and 14 and yokes 7 and 11 of two motors, which will be described later, on the surface on the solid-state imaging device side, that is, the surface on the blade chamber side. 1e is formed. Further, the base plate 1 includes five shafts 1f, 1g, 1h, 1y, 1z, two mounting shafts 1i, 1j, and eight spacers 1k, 1m, 1n, 1p, 1q, 1r, 1s, 1t. And four stopper portions 1u, 1v, 1w, and 1x. The two shutter blades 4 and 5 disposed between the base plate 1 and the intermediate plate 3 have long holes 4a and 5a. The shutter blade 4 faces the base plate 1 side, and the shaft 1f. , 1 g is rotatably attached. One diaphragm blade 6 disposed between the cover plate 2 and the intermediate plate 3 has a diaphragm opening 6a having a diameter smaller than the opening 2a of the cover plate 2 and a long hole 6b. The shaft 1h is rotatably attached. Needless to say, if an ND filter plate is attached to such a diaphragm blade 6 so as to cover the diaphragm opening 6a, it becomes a filter blade.

  The driving means for the shutter blades 4 and 5 and the diaphragm blade 6 in this embodiment are both the same type of moving magnet type motor, and both have the same configuration. The moving magnet type motor to be driven will be described. The stator of this motor is composed of a yoke 7 having a substantially U shape and having two end portions as magnetic pole portions, and a bobbin 9 in which a coil 8 is wound around the outside of the cylindrical portion. The cylindrical portion is fitted from one end portion of the yoke 7. The bobbin 9 has two terminal pins 9a and 9b on the ground plate 1 side, and has a substantially rectangular projecting portion 9c on the cover plate 2 side. The projecting portion 9c has a hole 9d. Is formed. On the other hand, the rotor 10 includes a substantially cylindrical permanent magnet 10a magnetized in two radial directions, and a synthetic resin drive member 10b integrated on the cover plate 2 side of the permanent magnet 10a. The output pin 10c provided at the tip of the driving member 10b is fitted in the long holes 4a and 5a of the shutter blades 4 and 5. In this embodiment, the drive member 10b and the output pin 10c are made of synthetic resin, but they may be made of permanent magnets.

  Next, a moving magnet type motor for driving the diaphragm blade 6 will be described. The stator of this motor is composed of a yoke 11 having a substantially U shape and having two end portions as magnetic pole portions, and a bobbin 13 having a coil 12 wound around the outside of the cylindrical portion. The cylindrical portion is fitted from one end portion of the yoke 11. The bobbin 13 has two terminal pins 13a and 13b on the ground plate 1 side, and has a substantially rectangular projecting portion 13c on the cover plate 2 side, and the projecting portion 13c has a hole 13d. Is formed. On the other hand, the rotor 14 includes a substantially cylindrical permanent magnet 14a magnetized in two radial directions, and a synthetic resin drive member 14b integrated with the surface of the permanent magnet 14a on the cover plate 2 side. The output pin 14c provided at the tip of the drive member 14b is fitted in the long hole 6b of the aperture blade 6. Even in the case of the rotor 14, the drive member 14b and the output pin 14c are not prevented from being made of permanent magnets.

  Here, how to assemble the blade driving device of this embodiment will be described. First, the base plate 1 is placed on a work table with its subject side face down. At this time, a predetermined interval is maintained between at least the formation surface of the holes 1b and 1c and the work table. In the case of the present embodiment, all the constituent members such as the motor constituent members and the shutter blades are sequentially assembled on the surface of the base plate 1 on the solid-state imaging device side. Therefore, as compared with the conventional case, the assembling work is easier than the case where the ground plate 1 is assembled separately on both sides. In addition, no dedicated fixing member such as a screw component is used for the assembly. Therefore, the present embodiment is extremely advantageous in terms of cost over the conventional apparatus.

  Thus, an example of the assembly order will be described. First, a motor for driving the shutter blades 4 and 5 is attached to the base plate 1. In that case, first, the output pin 10 c is directed to the side opposite to the ground plane 1, and the permanent magnet 10 a of the rotor 10 is fitted to the shaft 1 y of the ground plane 1. Next, the stator with the bobbin 9 fitted to the yoke 7 is placed with the terminal pins 9 a and 9 b facing the ground plate 1, and the yoke 7 is dropped into the recess 1 d of the ground plate 1. At that time, the hole 9 d of the bobbin 9 is fitted to the shaft 1 y of the main plate 1. That is, the protruding portion 9 c of the bobbin 9 is used to prevent the rotor 10 from coming off. At this time, a part of the bobbin 9, that is, a part of the coil 8 is inserted into the hole 1 b of the ground plane 1, and only the two terminal pins 9 a and 9 b protrude from the object side surface of the ground plane 1. become. In this state, the bobbin 9 is restricted from moving with respect to the yoke 7 by the edge of the hole 1b. However, in the drawing, the bobbin 9 is shown with a slight gap in order to show the shape of the hole 1b. On the other hand, the movement of the yoke 7 in the longitudinal direction is restricted by the wall portions 1d-1 and 1d-2 formed in the recess 1d, and the movement in the width direction is restricted by the side surfaces of the spacers 1s and 1t. It becomes like this.

  Next, the motor for driving the diaphragm blade 6 is attached to the main plate 1 in the same manner. That is, first, the output pin 14 c is directed to the side opposite to the base plate 1, and the permanent magnet 14 a of the rotor 14 is fitted to the shaft 1 z of the base plate 1. Next, the bobbin 13 is fitted in the yoke 11, the terminal pins 13 a and 13 b are placed on the ground plate 1 side, and the yoke 11 is dropped into the recessed portion 1 e of the ground plate 1. Then, the hole 13 d of the bobbin 13 is fitted to the shaft 1 z of the main plate 1. As a result, a part of the bobbin 13 and the coil 12 is inserted into the hole 1c of the base plate 1, and only the two terminal pins 13a and 13b protrude from the surface of the base plate 1 on the subject side. In this state, the bobbin 13 is restricted from moving with respect to the yoke 11 by the edge of the hole 1c, and the yoke 11 is moved in the longitudinal direction by the wall portions 1e-1 and 1e-2 formed in the recess 1e. The movement in the width direction is regulated by the side surfaces of the spacer portions 1k and 1m.

  Thus, after assembling the components of the two motors, circular holes (reference numerals omitted) provided in the shutter blades 4 and 5 are fitted to the shafts 1f and 1g, and the long holes 4a and 5a are fitted. Is fitted to the output pin 10c. Thereafter, the intermediate plate 3 is assembled. In this case, the intermediate plate 3 is moved in a direction parallel to the surface of the ground plane 1 by fitting the holes 3b and 3c to the shafts 1f and 1h of the ground plane 1. Be regulated. Further, the intermediate plate 3 is maintained at a distance from the ground plane 1 by bringing the surface on the ground plane 1 side into contact with the spacers 1 n, 1 q, 1 r of the ground plane 1. Next, a circular hole (not shown) provided in the diaphragm blade 6 is fitted to the shaft 1h, and the long hole 6b is fitted to the output pin 14c.

  Finally, the cover plate 2 is attached. As can be seen from FIGS. 2 to 4, the shafts 1 i and 1 j provided on the base plate 1 are formed with a large collar portion at their tips. However, until the cover plate 2 is attached, the shafts 1i and 1j are not formed with such flanges, and have a cylindrical shape up to the tip. Accordingly, these flanges are formed by fitting the circular holes (not shown) formed in the cover plate 2 to the shafts 1i and 1j, and then thermally melting the tips of the shafts 1i and 1j. Formed. And in the state which attached the cover board 2 in this way, the cover board 2 makes the surface by the side of the baseplate 1 contact the spacers 1k, 1p, 1s, and 1t of the baseplate 1, and the spacer 2d Thus, the distance from the intermediate plate 3 is maintained.

  At this time, the cover plate 2 is also formed with a hole having the same shape as the hole 3 b of the intermediate plate 3, and the tip of the shaft 1 h of the base plate 1 is fitted therein, and is formed in the cover plate 2. The tips of the output pins 10c, 14c of the rotors 10, 14 are inserted into the two arc-shaped long holes 2b, 2c. Further, at this time, the cover plate 2 presses the protruding portions 9c, 13c of the two bobbins 9, 13 against the spacer portions 1m, 1t of the base plate 1, and the bobbins 9, 13 are in the axial direction of the shafts 1y, 1z. Is prevented from moving to. Therefore, the rotors 10 and 14 can always rotate stably.

  Thus, in the case of the present embodiment, since all the motor constituent members are mounted in the blade chamber, the overhang portions 9c and 13c of the bobbins 9 and 13 that prevent the rotors 10 and 14 from being detached. Even if the thickness is not increased more than necessary, there is no possibility of damaging motor components such as the rotors 10 and 14 during the movement of the apparatus. Therefore, the configuration is extremely advantageous for reducing the thickness of the apparatus. Further, in the case of the present embodiment, the cover plate 2 presses the protruding portions 9c, 13c of the bobbins 9, 13 directly against the ground plate 1, so that no dedicated fixing member is required, and the cost is extremely low. It has an advantageous configuration. However, the present invention does not prevent the bobbins 9 and 13 from being fixed to the main plate 1 with screws or the like while maintaining the thinning of the device by changing the shapes of the overhang portions 9c and 13c. Further, even when the overhang portions 9c and 13c of the bobbins 9 and 13 are only pressed against the main plate 1, the intermediate plate 3 is enlarged without being directly pressed by the cover plate 2, and the intermediate plate 3 may be pressed.

  Next, the operation of this embodiment will be described with reference to FIGS. As described above, the present embodiment can be adopted for both a silver salt film camera and a digital camera. However, since the operation will be described in the case where it is adopted in a digital camera, the state shown in FIG. 2 is the shooting standby state of the present embodiment, that is, the camera is turned on, It is a state that has not been performed. Therefore, in this state, the opening 2a for restricting the exposure opening is fully opened, and it is possible to observe a subject image or a photographed image with a liquid crystal monitor.

  At this time, no current is supplied to the coils 8 and 12. However, as is well known, the rotors 10 and 14 are biased so as to rotate in the clockwise direction due to the relative positional relationship between the permanent magnets 10a and 14a and portions not shown formed on the yokes 7 and 11. One rotor 10 is maintained in a stationary state by the shutter blade 4 abutting against the stopper 1w and the shutter blade 5 abutting against the stopper 1u, and the other rotor 14 is The stationary blade 6 is in contact with the stopper 1x, so that this stationary state is maintained. At this time, the side surface of the spacer 1r also serves as a stopper for the shutter blade 5.

  In this state of FIG. 2, when the photographer presses the release button while observing the subject image, first, the subject light is dimmed depending on the measurement result of the subject light, or the subject is photographed without being dimmed. In the case of shooting with dimming, the coil 12 is first energized, and then the coil 8 is energized for a predetermined time, and when shooting without dimming, the coil 12 is not energized. Only the coil 8 is energized. However, since it is considered that neither of these cases will be described, the case of shooting with dimming will be described. Therefore, first, when the coil 12 is energized, the rotor 14 is rotated counterclockwise in FIG. 2, and the diaphragm blade 6 is rotated clockwise. Then, the diaphragm blade 6 is brought into contact with the stopper 1w and stopped so that the diaphragm opening 6a faces the opening 2a, and the optical path area of the subject light is made smaller than in the case of the opening 2a.

  When the diaphragm blade 6 stops, the solid-state imaging device releases the charge accumulated so far by a signal from the exposure control circuit, and starts to accumulate charges for photographing (exposure exposure for photographing). It is done. Then, when a predetermined time corresponding to the luminance of the subject and the aperture opening has passed, the coil 8 is energized in the positive direction by a signal from the exposure control circuit, and the rotor 10 rotates counterclockwise in FIG. The output pin 10c rotates the shutter blade 4 in the clockwise direction and the shutter blade 5 in the counterclockwise direction, thereby closing the opening 2a. Thereafter, when the shutter blades 4 and 5 completely close the opening 2a, the rotation of the rotor 10 is stopped by the shutter blade 4 coming into contact with the stopper 1v. FIG. 4 shows the stationary state.

  In this state, the imaging information accumulated in the solid-state imaging device is transferred to the storage device. When the transfer ends, the coil 8 is energized in the opposite direction to the previous one. As a result, the rotor 10 is rotated clockwise in FIG. 4, and the output pin 10c rotates the shutter blade 4 counterclockwise and rotates the shutter blade 5 clockwise to open the opening 2a. To go. When the shutter blades 4 and 5 fully open the opening 2a, the shutter blade 4 comes into contact with the stopper 1w and the shutter blade 5 comes into contact with the stopper 1u, whereby the rotation of the rotor 10 is stopped.

  On the other hand, the coil 12 is also energized in the opposite direction to the coil 8 almost simultaneously with the coil 8. Therefore, in FIG. 4, the rotor 14 is rotated clockwise, and the diaphragm blade 6 is rotated counterclockwise. Then, when the diaphragm blade 6 is completely retracted from the opening 2a and is brought into contact with the stopper 1x and stopped, the rotation of the rotor 14 is also stopped. Thereafter, when the energization of the two coils 8 and 12 is cut off, the state shown in FIG. 2 is obtained, and this state continues until the next photographing.

  In this embodiment, the shutter device and the aperture device are configured as a single unit. However, as described above, the present invention can also be configured by separately configuring the shutter device, the aperture device, and the filter device. There is no problem. In addition to the present embodiment, the shutter device and the filter device may be configured as a single unit, or the diaphragm device and the filter device may be configured as a single unit. The device may be configured as a single unit. Further, in the case of a diaphragm device or a filter device, a plurality of devices may be provided in one unit. In this embodiment, the rotor has one output pin. However, the present invention is not limited to such a configuration and, as is well known, has two output pins. The two blades may be configured to operate substantially linearly in opposite directions.

It is the top view of the Example which looked at the imaging | photography standby state from which the shutter blade | wing was fully opened from the to-be-photographed object side. It is the top view of the Example which looked at the same state as FIG. 1 from the solid-state image sensor side. It is sectional drawing for demonstrating clearly the structure of the principal part of an Example. It is the top view of the Example which looked at the state which the shutter blade | wing closed from the solid-state image sensor side.

Explanation of symbols

1 ground plane 1a, 2a, 3a opening 1b, 1c, 3b, 3c, 9d, 13d hole 1d, 1e hollow 1f, 1g, 1h, 1y, 1z axis 1i, 1j mounting axis 1k, 1m, 1n, 1p, 1q , 1r, 1s, 1t, 2d Spacer portion 1u, 1v, 1w, 1x Stopper portion 2 Cover plate 2b, 2c, 4a, 5a, 6b Long hole 3 Intermediate plate 4, 5 Shutter blade 6 Shutter blade 6a Aperture opening 7 , 11 Yoke 8, 12 Coil 9, 13 Bobbin 9a, 9b, 13a, 13b Terminal pin 9c, 13c Overhang 10, 14 Rotor 10a, 14a Permanent magnet 10b, 14b Drive member 10c, 14c Output pin

Claims (3)

  At least one blade chamber is configured between the ground plate having the opening for the photographing optical path and the cover plate having the opening for the photographing optical path and attached to the ground plate, A vane driving device for a camera in which at least one vane that is reciprocated by a driving means and is moved back and forth in the opening is arranged in the vane chamber, and the driving means is an output pin for reciprocating the vane A rotor made of a permanent magnet that is rotatably attached to a shaft erected on the blade chamber side surface of the base plate, and an axial direction of the cylindrical portion around which the coil is wound In the projecting portion that is arranged in parallel to the ground plane and on the cover plate side of the ground plane, a part of the coil is inserted into a hole formed in the ground plane and parallel to the ground plane Fit the provided hole to the tip of the shaft And a yoke that is substantially U-shaped and has the bobbin fitted in the cylindrical portion and has two magnetic pole portions facing the circumferential surface of the rotor. Camera blade drive device.   2. The wing drive device for a camera according to claim 1, wherein the bobbin is attached to the base plate in a state in which a hole provided in the projecting portion is fitted to the shaft. The said cover plate is attached to the said ground plate in the state which pressed down the said bobbin, in order to maintain the fitting state of the hole provided in the said overhang | projection part, and the said axis | shaft. The wing drive device for a camera described.