JP4549132B2 - Actuator for camera blade drive - Google Patents

Description

  The present invention relates to an actuator for a camera blade drive device in which blade members such as shutter blades, diaphragm blades, filter blades, and barrier blades are advanced and retracted to an opening for a photographing optical path.

  In the case of a shutter device employed in a recent digital camera (a camera using a solid-state imaging device such as a digital still camera, a digital video camera, or a camera for various information terminal devices), the directions in which the two shutter blades conflict with each other It is known that a circular exposure opening is opened and closed by reciprocally rotating (see Patent Document 1 below) or linearly reciprocating (see Patent Document 2 below). However, as a built-in camera for a small information terminal device such as a small digital still camera or a cellular phone, there is also known a device in which an exposure opening is opened and closed by reciprocating a single shutter blade. It has been.

  In addition, some recent diaphragm devices are also known in which two diaphragm blades are simultaneously rotated in opposite directions or operated linearly to stop at a predetermined aperture opening restriction position. However, in the case of a small-sized popular camera, a single aperture blade having a small circular aperture opening is made to enter the exposure aperture so that shooting is performed with a small aperture, and the camera is retracted. In many cases, a large-aperture shooting is performed (see Patent Document 1). And the aperture device of those structures is employ | adopted for the silver salt film camera and the digital camera.

  As with the diaphragm device, an ND filter device is known as a device that reduces the amount of photographing light. However, as a recent ND filter device, a circular opening such as the above-described diaphragm blade (the opening in this case is A plate member formed with a ND filter plate so as to cover the opening may be used as a filter blade in the same manner as the above-described diaphragm blade. It is common to operate. However, other than that, the ND filter plate having only the shape of a blade is used as a filter blade, or such a blade-shaped ND filter plate is formed by two plate members having a circular opening as described above. It is also known that the filter blades are constructed by sandwiching three sheets. These filter devices can be employed in both silver salt film cameras and digital cameras.

  In addition, some cameras are equipped with a barrier plate to prevent the taking lens from being scratched when not in use, such as when it is being carried, or to prevent the surface of the taking lens from being soiled by dust or fingerprints. There is known a barrier device in which one or a plurality of said barrier blades are operated to cover the front surface of a taking lens. Further, in many cases, such a barrier blade is a blade member having a light shielding property similar to that of the shutter blade described above, and is operated in substantially the same manner as in the case of the shutter blade, the diaphragm blade, and the filter blade. The opening for the photographing optical path provided in the camera is opened and closed. Needless to say, such a barrier device can be employed in both a silver salt film camera and a digital camera.

  In the case of such a camera blade driving device such as a shutter device, a diaphragm device, a filter device, and a barrier device, it is common to use a motor or an electromagnetic plunger as an actuator serving as a driving source. Therefore, current-controlled actuators called moving magnet type motors are often used. Various configurations of this actuator are known in addition to those described in Patent Documents 1 and 2, and as an example, a configuration that can easily cope with the thinning of the camera is disclosed in the following Patent Document: 3. And, even if this type of actuator has any configuration, basically, a rotor made of a permanent magnet magnetized in two or four poles in the radial direction is applied to the stator coil. By applying a rotational force in a direction corresponding to the energization direction, the rotation can be performed only within a predetermined rotation angle range.

  In addition, there are actuators of this type that have only one stator coil and two that rotate a single rotor. In the case of a diaphragm device or the like that can be stopped at a position, two coils are provided so that a blade member such as a diaphragm blade is stopped at a position where current values supplied to the coils are balanced. There is something that was made.

  Further, in the case of this type of actuator, the rotor has a drive pin (output pin) that operates integrally, but the drive pin is permanent as described in Patent Documents 1 and 2. Although it is usually made of a material different from the magnet rotor body, as described in Patent Document 3, it is a synthetic resin material mixed with magnetic particles, together with the rotor body. There are also known ones that are integrally molded and magnetized. In addition, in the blade driving device described in Patent Documents 1 to 3, the output pin of the rotor is directly used as the driving pin of the blade member. However, as is well known, in the case of this type of blade driving device, the rotation is rotated. In some cases, a driving member (also referred to as an opening / closing lever or the like) is rotated by an output pin of a child, and a blade member is operated by a driving pin provided on the driving member.

  And the actuator of the structure as described in patent documents 1 and 2 is usually attached as a unit and then attached to the main plate of the blade driving device. In addition, as described in Patent Document 3, an actuator that employs a yoke fitted with a coil as a stator is a component member without being unitized in order to cope with the thinning of the camera. Are often assembled directly to the base plate of the blade drive device, but depending on the specifications of the camera, it is configured as a unit and then attached to the base plate of the blade drive device. It is also possible to do so.

  By the way, as described above, the current control type actuator used as a driving source for various blade driving devices is extremely effective for cost reduction and size reduction. When power is not supplied to the rotor, the rotor becomes unstable and it is difficult to stop the blade member at a predetermined position. Therefore, in the case of the actuator having the configuration described in Patent Documents 1 and 2, when a magnetic member called an iron pin or a magnetic rod is arranged in the vicinity of the rotor and the coil is in a non-energized state However, the stop state at one end of the rotatable angle range is maintained by applying a rotational force to the rotor by a suction force acting between the rotor and bringing it into contact with a predetermined stopper. In addition, in the case of the actuator having the configuration described in Patent Document 3, there is no coil by devising the shape in the vicinity of the magnetic pole part of the yoke or by arranging another magnetic member in the vicinity of the rotor. Even in the energized state, the stop state at one end of the rotatable angle range can be maintained by the attractive force acting between them and the rotor.

However, by adopting such a configuration, even when the rotor is able to maintain a stopped state at one end position of the rotatable angle range when the coil is in a non-energized state, unexpected vibration is caused to the camera. When an impact is applied to the blade member, a rotational force is generated in the blade member, and the attractive force acting between the rotor and the magnetic member (including a part of the yoke) is thereby generated. Against this, it is rotated greatly to the other end position of the rotatable angle range, and the stopped state is maintained at that position, or in some cases, it is stopped at an approximately middle position between these two positions. There are things to do. Therefore, even when such a situation occurs, a shutter device having a configuration in which the position of the blade member operated by the rotor is detected by a sensor and the rotor is returned to a predetermined stop position is described below. Document 4 describes. The present invention relates to an actuator effective for use in various camera blade driving devices having such functions.
Japanese Patent Laid-Open No. 2000-60088 JP 2002-315294 A JP 2003-186079 A JP 2001-183718 A

  As described in Patent Document 4, the conventional blade driving device having the functions as described above has blade members (shutter blades 3 and 3a) with respect to the ground plate (shutter ground plate 1) of the blade driving device. And a photosensor (photocoupler 4) for detecting the position of the blade member and an actuator (actuator 5) for driving the blade member are individually attached. Whether or not the blade member is at a predetermined stop position is detected by detecting the blade member itself with a photo sensor and moving by an impact or the like, and detecting that the blade member is not at the predetermined stop position. The blade member is returned to a predetermined stop position by rotating it to a predetermined one end position within the rotatable angle range.

  By the way, when the photosensor directly detects the position of the blade member as in the prior art, it is necessary to provide the detected portion on the tip side of the blade member as can be seen from the description in Patent Document 4. For this reason, normally, the area of the blade member must be increased by the amount of the detected portion. And if a blade member becomes large, since it is necessary to make it possible to cover the whole operation area | region of a base plate, the whole apparatus will become large and will become a disadvantageous for size reduction. Further, the shape and size of the blade member vary depending on the model. For this reason, it is necessary to attach the photo sensor to the ground plane at the optimal position corresponding to them, but doing so complicates the design of the device due to the mounting configuration of the photo sensor, the routing of the wiring, etc. There may be restrictions on the side design.

  In addition, as in the conventional case, when the blade member, the photo sensor, and the actuator are individually attached to the ground plate, the number of attachment portions to the ground plate is increased, which is not preferable in production. In addition, depending on the shape and size of the detected portion of the blade member, it is necessary to change the type or size of the photosensor for each type of blade driving device. Furthermore, in the adjustment work at the end of the assembly of the device, it is necessary to adjust the mounting state of the photo sensor or the mounting state of the actuator with respect to the blade member mounted in the blade chamber. There is also a problem that the work becomes troublesome. Therefore, it is required that a photosensor does not need to be individually attached to the ground plane, and that it is not necessary to use a different photosensor depending on the model.

  The present invention has been made in order to solve such problems. The object of the present invention is to configure the above-described photosensor as an unit together with an actuator in advance so that the blade member is a predetermined member. Whether or not it is in the position is detected indirectly by detecting the rotational position of the rotor, thereby eliminating the need to provide a detected portion on the blade member, enabling downsizing of the apparatus, and the ground plane Since the number of mounting parts on the head is reduced, the adjustment work during assembly is facilitated, and the detection can be performed regardless of the shape and size of the blade member. Another object is to provide an actuator for a camera blade driving device.

In order to achieve the above object, an actuator of a camera blade driving device according to the present invention is a stator attached to a ground plate that attaches at least one blade member to an opening for photographing optical path so as to be able to advance and retract. A frame, a rotor having a permanent magnet and rotatably attached to the stator frame, and a current supplied only within a predetermined angle range provided on the stator frame and energized. A coil capable of rotating the rotor in a direction corresponding to the direction, a photosensor having a light emitting part and a light receiving part and attached to the stator frame, and rotatably attached to the stator frame with the rotation of the rotor of the vane member and have a light shielding portion or a reflection portion can advance and retreat in the detection optical path of the photosensor with has a drive for advancing and retracting the opening Equipped with a drive member that is rotated Te, the driving member rotates on an axis parallel to the rotation axis of the rotor, with the drive unit, and the light-shielding portion or the reflector portion, said rotary shaft The photosensor detects whether the light-shielding part or the reflection part is at a predetermined rotational position, and is provided before the start of photographing. When the light shielding part or the reflection part is not at the predetermined rotation position, a current can be supplied to the coil until the light shielding part or the reflection part moves to the predetermined rotation position by the detection signal .

In that case, the photosensor, when the blade member is completely retreated from the opening, by the light shielding part, to preferably the detection beam path is configured to be cut off, The front Symbol driving member However, if it is formed integrally with the rotor, it will be compact at low cost. Furthermore, before Symbol stator frame has a first stator frame attached to said base plate, said rotor is comprised of the second stator frame that bearings in the first stator frame, wherein the coil When the photo sensor is attached to the first stator frame so as to be wound around the first stator frame and the second stator frame so as to surround the bearing portions, the camera blades This is more suitable for reducing the mounting area to the driving device.

  The actuator of the present invention includes a photosensor that detects whether or not the rotor is at a predetermined rotational position, and indirectly detects the position of the blade member. The apparatus can be miniaturized as much as it is not necessary to provide the member. Further, when the actuator of the present invention is employed, it is not necessary to individually attach the photosensor to the ground plane, so that the adjustment work at the time of assembling the apparatus is further facilitated. Furthermore, when the actuator of the present invention is adopted, it is not necessary to directly detect the position of the blade member, so that the photo sensor mounting position on the base plate is set according to the shape and size of the blade member as in the past. There is no need to do so, which is extremely advantageous in designing and manufacturing the apparatus.

  Embodiments of the present invention will be described with reference to the illustrated examples. In this embodiment, the actuator unit of the present invention is applied to a shutter device for a small digital still camera. The actuator unit is an actuator of the type described in Patent Document 4. And a well-known direct-light photosensor as a unit. 1 is a front view showing a fully opened state of the shutter blades, and FIG. 2 is a cross-sectional view of a main part in a closed state of the shutter blades. 3 is a front view showing a state in which the flexible printed wiring board is removed from FIG. 1, and FIG. 4 is a rear view of FIG. Further, FIG. 5 is a front view showing the closed state of the shutter blades in the same manner as FIG. 3, and FIG. 6 is a rear view of FIG.

  First, the structure of a present Example is demonstrated using FIGS. 1-4. The base plate 1 is made of a synthetic resin and has a circular opening 1a for a photographing optical path. The cover plate 2 clearly shown in FIG. 4 is made of metal and has a circular opening 2a for the photographing optical path in a region facing the opening 1a of the base plate 1. The portion 1a has a smaller diameter and restricts the exposure opening. The base plate 1 and the cover plate 2 constitute a blade chamber between the two by attaching the cover plate 2 to the base plate 1. In the present embodiment, the opening 1a of the base plate 1 regulates the exposure opening. However, the opening 2a of the cover plate 2 is exposed by reversing the sizes of the opening 1a and the opening 2. You may make it regulate opening.

  Here, how to attach the cover plate 2 to the main plate 1 will be described. As shown in FIG. 4, shafts 1 b, 1 c, 1 d, 1 e, and 1 f are erected on the base plate 1 on the cover plate 2 side. Among these, the shafts 1c and 1f are shafts for positioning the base plate 1 and the cover plate 2, and the shaft 1c is inserted into an oval hole formed in the cover plate 2, and the shaft 1f is a cover. It is inserted into a circular hole formed in the plate 2. The shaft 1f also serves to attach the ground plate 1 and the cover plate 2 together with the shafts 1b, 1d, and 1e inserted into the holes of the cover plate 2. That is, after the four shafts 1b, 1d, 1e, and 1f are inserted into the holes formed in the cover plate 2, their tips are heat-melted and deformed into a substantially circular bowl shape larger than the shaft diameter. The cover plate 2 is prevented from being removed from the shafts 1b, 1d, 1e, and 1f. (Refer to the case of axes 1e and 1f in FIG. 2)

  Next, a configuration for attaching the base plate 1 to the camera body will be described. In FIG. 1, an oval hole 1 h and a circular hole 1 i are formed on the right side of the base plate 1. As shown in FIG. 4, shaft-shaped receiving portions 1 j, 1 k, 1 m are provided on the surface of the base plate 1 on the cover plate 2 side, and the receiving portion 1 k is the cover plate 2. It penetrates the hole 2b formed in the. Therefore, first, the oval hole 1h is fitted to a positioning shaft provided in the camera body arranged on the base plate 1 side. Then, after the circular holes 1i are overlaid on the screw holes formed on the camera body side, screws are inserted into the holes from the cover plate 2 side and fixed. Thereafter, a third member such as a lens barrel (not shown) is attached to the camera body from the cover plate 2 side. At this time, the tips of the receiving portions 1j, 1k, and 1m serve as contact surfaces for the third member. Thus, the cover plate 2 is prevented from being deformed and also serves to position the third member.

  As shown in FIG. 4, the base plate 1 attached to the camera body is provided with a shaft 1n and two stoppers 1p and 1q on the surface on the cover plate 2 side. The tip of the shaft 1n is inserted into a hole 2c formed in the cover plate 2. A shutter blade 3 having a long hole 3a is rotatably attached to the shaft 1n in the blade chamber. Further, as shown in FIG. 4, the cover plate 2 has an arc-shaped long hole 2d, but the base plate 1 has substantially the same shape so as to overlap the long hole 2d. The elongated hole 1r is formed.

  Next, the unit configuration of the actuator attached to the surface outside the blade chamber of the main plate 1 will be described. The actuator of the present embodiment is basically the same as the type described in Patent Document 1. First, the configuration of the stator will be described. As can be easily understood from FIG. 2, the stator frame of the present embodiment has a flat plate-like first coil frame 4 and a closed wall at the upper end of the cylindrical portion, and has a cup shape as a whole. The rotor which will be described later is disposed in the storage chamber constituted by the second coil frame 5. In this embodiment, the stator frame is constituted by two members (the first stator frame 4 and the second stator frame 5) as described above. For example, the second stator of this embodiment is used. The frame 5 may be divided into two members and constituted by three members.

  On the outside of the first stator frame 4 and the second stator frame 5 as described above, concave grooves are formed with predetermined widths, respectively, and the first stator frame 4 and the second stator frame 5 are combined. In such a state, the concave grooves become one annular groove surrounding the accommodation chamber in the vertical direction in FIG. 2, and the two stator frames 4, 5 are integrated by winding the coil 6 therearound. ing. The closing wall of the second stator frame 5 is provided with two terminal pins 5a and two positioning pins 5b, and the coil 6 wound around the two stator frames 4 and 5 as described above. Are wound around the two terminal pins 5a. In addition, after the coil 6 is wound around the two stator frames 4 and 5 in this way, a cylindrical yoke 7 is fitted on the outside thereof. Further, four known magnetic rods 8 are embedded in the second stator frame 5. Unlike the present embodiment, when two coils are wound, four terminal pins 5a as described above are required.

  As can be seen from FIG. 2, the first stator frame 4 is provided with a recess, and a photosensor 9 is press-fitted therein. Further, a flexible printed wiring board 10 as shown in FIG. 1 supplies two currents to the two positioning pins 5b of the second stator frame 5 in order to supply current to the photo sensor 9 and the coil 6. Four metal pins (two for the light emitting part and two for the light receiving part) provided in the photosensor 9 with the holes fitted therein, and two terminals of the second stator frame 5 Soldered to both ends of the coil 6 wound around the pin 5a.

  In the case of the present embodiment, the photosensor 9 is a direct-type photo in which the light emitting part and the light receiving part are arranged at opposing positions so that the light emitted from the light emitting part is directly incident on the light receiving part. Although it is a sensor, the photosensor of the present invention is not limited to such a type, and is a reflection type photosensor in which light emitted from the light emitting part is reflected by a predetermined reflecting means and enters the light receiving part. It does not matter. In that case, the light emitting unit and the light receiving unit are arranged adjacent to each other. However, the reflecting means may be provided at the position of the light receiving portion in the direct photosensor or may be provided on the light shielding wall 11d to be described later. The H level signal is reversed.

  Next, the configuration of the rotor that is supported in the above-described accommodation chamber will be described. The rotor 11 of the present embodiment has a permanent magnet 11a magnetized in two radial directions, and a rotating shaft made of synthetic resin is connected to the first stator frame 4 and the second stator frame 5. It is bearing at. A synthetic resin arm portion 11b extending in the radial direction from the peripheral surface of the permanent magnet 11a is provided with a drive pin 11c and a light shielding wall 11d extending in opposite directions parallel to the rotation axis. The drive pin 11c passes through the arc-shaped long hole 1r formed in the base plate 1, is fitted into the long hole 3a of the shutter blade 3 in the blade chamber, and the tip of the drive pin 11c is formed in the arc-shaped shape of the cover plate 2. It is inserted in the long hole 2d. Further, the light shielding wall 11d can be moved back and forth in the detection optical path of the photosensor 9. In the rotor 11 of this embodiment, the other part of the rotor 11 is integrally formed with the cylindrical permanent magnet 11a by so-called outsert processing using a synthetic resin material. May be formed of a synthetic resin material (plastic magnet material) mixed with magnetic particles.

  Next, the attachment structure to the main plate 1 of the actuator having such a unit structure will be described. First, as can be seen from FIG. 2, the first stator frame 4 is provided with two positioning pins 4 a on the lower surface thereof, and is fitted in respective holes provided in the base plate 1. Further, as can be seen from FIGS. 1 and 3, the base plate 1 is provided with three hook portions 1 s having flexibility, and these are hung on the first stator frame 4 as shown in FIG. 2. This prevents the first stator frame 4 and thus the actuator unit from moving upward. Then, the flexible printed wiring board 10 is placed on the positioning pins 1t and 1u provided on the base plate 1 as shown in FIG. 1 in order to prevent excessive force from being applied to each soldering portion. The holes 10a and 10b are fitted.

  Next, the operation of this embodiment will be described with reference to FIGS. As described above, the present embodiment is configured as a shutter device for a small digital still camera. 3 and 4 show an initial state in which the shutter blade 3 fully opens the opening (exposure opening) 1a. At this time, no current is supplied to the coil 6. However, as is well known, a rotational force in the counterclockwise direction in FIG. 3 is applied to the rotor 11 by the attractive force acting between the permanent magnet 11 a of the rotor 11 and the magnetic rod 8. However, as shown in FIG. 4, the shutter blade 3 is brought into contact with the stopper 1p, and this stopped state is maintained. In addition, the shutter blade 3 is in a fully open state, which means that the light shielding wall 11d of the rotor 11 is in the detection light path (between the light emitting part and the light receiving part) of the photosensor 9, and the light emission to the light receiving part Since the light emitted from the unit is blocked, an L level detection signal is emitted from the photosensor 9, which is confirmed on the control circuit.

  When the release button is pressed at the time of shooting, the charge accumulated in the solid-state image sensor until then is released, and the accumulation of charges for shooting starts immediately after that. When a predetermined time elapses, the coil 6 is energized in the positive direction, and the rotor 11 is rotated clockwise in FIG. Therefore, the shutter blade 3 is rotated clockwise by the drive pin 11c and closes the opening 1a. At this time, since the light shielding wall 11d of the rotor 11 moves away from the detection optical path of the photosensor 9, the detection signal changes from the L level to the H level, but the detection signal from the photosensor 9 during shooting is completely ignored. Thus, the operation of the shutter blade 3 is not affected at all.

  Thereafter, when the opening 1a is completely closed, the shutter blade 3 stops immediately after coming into contact with the stopper 1q. The stop state is shown in FIGS. Thus, immediately after the closing operation of the shutter blade 3 is completed, the imaging information photoelectrically converted by the solid-state imaging device is transferred to the storage device via the image processing circuit. When the transfer ends, the coil 6 is energized in the opposite direction to the previous one. Therefore, the rotor 11 is rotated counterclockwise in FIG. 5, and the shutter blade 3 is rotated counterclockwise by the drive pin 11c to open the opening 1a. Then, after the opening 1a is fully opened, the shutter blade 3 is brought into contact with the stopper 1p and stopped, and thereafter, when the power supply to the coil 6 is cut off, the shutter blade 3 returns to the initial state of FIG.

  By the way, the above description of the operation has been made on the assumption that the shutter blade 3 is stopped at the initial position, that is, the fully open position, immediately before photographing. Also, it has been described that the stopped state is maintained by the attractive force acting between the permanent magnet 11 a of the rotor 11 and the magnetic rod 8. However, such a suction force is not absolute. When a strong impact is applied to the camera or a strong vibration is applied, the rotor 11 is rotated against the above suction force. There is. If the rotation is slight, the rotation is restored by the above-described attraction force. However, when the rotation is greatly rotated, the attraction force acting between the magnetic rod 8 causes the rotor 11 to move. 5 and FIG. 6 works to rotate toward the state of FIG. 5 (in the case of this type of actuator, it is well known that such a rotational force acts), and the shutter blade 3 is shown in FIG. In the state of 6, the stop state may be maintained.

  Therefore, the photosensor 9 of the present embodiment is provided to detect whether the shutter blade 3 is in the fully open position or the closed position before photographing. 3 and FIG. 4, there is no problem because an L level signal is output from the photo sensor 9, but in the state of FIG. 5 and FIG. 6, an H level signal is present. In this case, the current in the reverse direction is immediately supplied to the coil 6 to rotate the shutter blade 3 to the fully open position. The above description of the operation has been made in the case where the shutter device of this embodiment is adopted in a digital still camera. However, in the case where the shutter device is adopted in a silver salt film camera, it is shown in FIGS. The closed state becomes the initial state, and at the time of photographing, the shutter blade 3 returns to the initial state after operating in the fully opened state shown in FIGS. 3 and 4.

  By the way, as described in Patent Document 4, conventionally, such a photosensor 9 is not provided in the actuator unit as in the present embodiment, and is individually attached to the ground plane 1. The position of the shutter blade 3 is directly detected. On the other hand, in the present embodiment, it is not necessary to provide the detected portion corresponding to the light shielding wall 11d on the shutter blade 3, so that the planar shape of the shutter blade 3 can be reduced correspondingly, and the shutter blade 3 can be made compact. Can be made lighter and lighter, and can be operated at high speed. In addition, since the planar shape of the shutter blade 3 is reduced as described above, the area of the opening / closing operation region of the shutter blade 3 can be reduced. Therefore, it is possible to reduce the size of the apparatus by reducing the planar shape of the main plate 1 in accordance with the mounting conditions to the camera body.

  Further, when the photosensors 9 are individually attached to the base plate 1 as in the past, depending on the attachment state of the shutter blades 3, that is, in relation to the detected portion formed on the shutter blades 3, At the time of assembling the apparatus, it is necessary to adjust the mounting state of the photosensor 9 with respect to the ground plane 1. However, in the case of the present embodiment, such a need is not necessary. Therefore, the adjustment work at the time of assembling the apparatus is further facilitated. Furthermore, since the photosensor 9 is not directly attached to the base plate 1 in the actuator unit of the present embodiment, the photo sensor 9 with respect to the base plate 1 is matched to the shape and size of the shutter blade 3 as in the prior art. There is no need to determine the mounting position at all, and the degree of freedom in designing the apparatus is increased.

  In addition, although the shutter apparatus of a present Example is provided with only one shutter blade | wing, this invention is also provided with the two shutter blade | wings as described in patent documents 1-4. It is possible to apply. The present invention can also be applied to a barrier device in which a blade having a configuration similar to that of the shutter blade is used as a barrier blade and arranged on the front surface of the photographing lens. The present invention can also be applied to a diaphragm device as described in Patent Document 1, and the shutter device described in Patent Document 2 as described in Patent Document 2 is used. The present invention can also be applied to a deformed diaphragm device. Furthermore, the present invention can also be applied to a filter device configured as a filter blade by covering the aperture blade opening described in Patent Document 1 with an ND filter plate. In that case, the opening may be larger than the exposure opening. In addition, the present invention can be applied to a filter device having various filter blades such as a ND filter plate having a blade shape.

  Further, the actuator of the present invention is not limited to a type in which a coil is wound around a bearing portion of a rotor, such as a moving magnet type motor having a configuration described in Patent Documents 1, 2, and 4. The invention can also be applied to a stator configuration in which a coil is wound around a U-shaped yoke as described in Patent Document 3. Further, among actuators used in blade driving devices such as shutter devices, in addition to those that are directly connected to blade members such as shutter blades using the output pins of the rotor as drive pins, as in the above-described embodiment, there are special features. As described in Japanese Laid-Open Patent Publication No. 2001-174867, etc., the output pin of the rotor is connected to a drive member called an opening / closing member and the like, and a drive pin (operation pin) provided on the drive member is connected. In the present invention, the actuator unit is provided with such a drive member, and the drive member is provided with a light-shielding wall as in this embodiment. Can also be applied.

It is the front view of the Example which showed the shutter blade fully open state. Although it is principal part sectional drawing of FIG. 1, the shutter blade | wing is shown in the closed state. It is a front view of the Example shown in the state which removed the flexible printed wiring board from FIG. FIG. 4 is a rear view of FIG. 3. It is the front view which showed the closed state of the shutter blade | wing similarly to FIG. FIG. 6 is a rear view of FIG. 5.

Explanation of symbols

1 ground plane 1a, 2a opening 1b, 1c, 1d, 1e, 1f, 1g, 1n shaft 1h, 1i, 2b, 2c, 10a, 10b hole 1j, 1k, 1m receiving part 1p, 1q stopper 1r, 2d, 3a Hole 1s Hook 1t, 1u, 4a, 5b Positioning pin 2 Cover plate 3 Shutter blade 4 First stator frame 5 Second stator frame 5a, 9a Terminal pin 6 Coil 7 Yoke 8 Magnetic rod 9 Photo sensor 10 Flexible print Wiring board 11 Rotor 11a Permanent magnet 11b Arm 11c Drive pin 11d Shading wall

Claims (4)

A stator frame that is attached to a base plate that is removably attached to an opening for photographing optical path with at least one blade member; and a permanent magnet that is rotatably attached to the stator frame. A rotor that is provided on the stator frame and that can rotate the rotor in a direction corresponding to a current supply direction only within a predetermined angle range, and a light emitting unit and a light receiving unit. And a photosensor attached to the stator frame, and a drive unit that is rotatably attached to the stator frame and moves the blade member forward and backward to the opening. And a drive member that has a light-shielding part or a reflection part that can move forward and backward in the detection optical path of the photosensor and is rotated in conjunction with the rotation of the rotor, and the drive member is the rotor Rotating axis and flat The drive unit and the light-shielding unit or the reflection unit are provided on the drive member as portions extending in directions opposite to each other and parallel to the rotation axis. Detects whether the light-shielding part or the reflection part is at a predetermined rotational position, and when the light-shielding part or the reflection part is not at the predetermined rotational position before the start of photographing, the light-shielding part or An actuator for a camera blade driving device, wherein a current can be passed through the coil until the reflecting portion moves to the predetermined rotational position .   2. The actuator of the camera blade driving device according to claim 1, wherein when the blade member is completely retracted from the opening portion, the detection optical path is blocked by the light shielding portion. . 3. The actuator for a camera blade drive device according to claim 1 , wherein the drive member is formed integrally with the rotor . The stator frame includes a first stator frame that is attached to the main plate, and a second stator frame that supports the rotor with the first stator frame, and the coil includes The first sensor frame and the second stator frame are wound around the bearing portion, and the photosensor is attached to the first stator frame. The actuator of the camera blade drive device according to any one of the above.