JP5373352B2 - Camera blade drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera blade driver that an electromagnetic actuator having approximately U-shaped yoke drives at least one of the blades back and forth and that its design flexibility can be maintained even when making it thin and using a miniaturized base plate. <P>SOLUTION: An electromagnetic actuator is attached to the base plate 1 at the side opposite to the blade container, a coil 5 cylindrically wound on an almost U-shaped yoke 6 is inserted into an escape recess 1i and disposed close to the blade container on the base plate 1. There are areas communicating and non-communicating with the blade container at the bottom of the escape recess 1i. At the non-communicating area, a beam 11j is formed thick as predetermined from the blade container on the base plate 1 toward the cover plate 2, and a stopper 1s is formed there to stop the shutter blade 8 while using its surface facing the cover plate 2 to receive this plate 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a camera blade drive device in which at least one blade is reciprocated by an electromagnetic actuator.

  Camera blade driving devices include a shutter device, a diaphragm device, a filter device, and a lens barrier device. Recently, these devices have at least one blade reciprocated by an electromagnetic actuator. Yes. In the case of a shutter device, a diaphragm device, and a filter device, two or more of them may be unitized as a single camera blade drive device. On the other hand, it is common to install a plurality of electromagnetic actuators. And recently, the base plate is almost always made of synthetic resin.

  In addition, by rotating the diaphragm drive ring in the camera blade drive device, a plurality of diaphragm blades are simultaneously rotated in the same direction, and the size of the aperture opening is continuously changed by the cooperation of the diaphragm blades. In the case of an aperture device that can be made to operate, at present, a stepping motor is usually adopted as an electromagnetic actuator. However, in the case of most other camera blade driving devices, the following Patent Document 1 is used. As described above, the permanent magnet rotor is rotated in a direction corresponding to the current supply direction to the stator coil only within a predetermined rotation angle range. It is normal to adopt.

  Further, in such a current control type electromagnetic actuator, as described in Examples 1 and 2 (FIGS. 1 to 5) of Patent Document 1 below, a stator coil is used as a rotor made of a permanent magnet. As shown in Examples 3 to 5 (FIGS. 6 to 11), the stator coil is wound on the outside of the two stator frames bearing the bearings so as to surround the bearing portions. In addition, there is a substantially U-shaped and the magnetic pole part at the tip of the two leg parts wound around a yoke facing the peripheral surface of the permanent magnet rotor, but the latter type is It is suitable for reducing the dimension in the direction parallel to the optical axis direction and making the device thinner.

  However, among the above-described Examples 3 to 5, in the case of Examples 3 and 4 (FIGS. 6 to 9), in order to further reduce the thickness of the device, a rectangular escape hole penetrating the ground plane And the outer peripheral surface of the stator coil wound in a cylindrical shape on one leg of the yoke can be brought close to the blade chamber side surface of the main plate. The present invention relates to a blade driving device for a camera in which at least one blade is reciprocated by the latter type of current-controlled electromagnetic actuator.

JP 2005-241866 A

  In the electromagnetic actuator mounting configuration described in Examples 3 and 4 of Patent Document 1, a part of the stator coil wound in a cylindrical shape is present when the blade is retracted from the exposure opening. It is arranged in a rectangular relief hole formed so as to overlap. Therefore, it is possible to reduce the thickness of the device and to reduce the size of the device by reducing the planar outer shape of the ground plane. And although it is not indicated in patent documents 1, when such an escape hole is formed in the perimeter part of a ground plane, one side of a rectangle is opened, and the remaining 3 sides form the outer periphery of a ground plane. Any shape may be used.

  By the way, in the case of a synthetic resin base plate, various protruding portions are formed by integral molding on the blade chamber side surface. And as the projecting part, there are a stopper that the blade comes into contact with, a blade mounting shaft for rotatably mounting the blade, a part necessary for mounting a cover plate constituting the blade chamber between the ground plate and the like. is there. However, when the above-described escape holes are formed in the base plate in order to reduce the thickness of the device, those projecting portions cannot be formed in the relief hole formation region.

  For this reason, in Examples 3 and 4 described in Patent Document 1, the shutter blade stoppers are arranged in a very narrow area close to the rectangular relief hole, as shown in FIG. There is a problem that the position is restricted and the degree of freedom of design of the entire apparatus is extremely impaired. In addition, since it is necessary to form these protruding portions outside the region where the escape holes are formed, there is also a problem that the planar outer shape of the ground plane cannot be changed to a desired shape or cannot be sufficiently reduced in size. It was.

  The present invention has been made to solve such problems, and the object of the present invention is to have a substantially U-shaped yoke in which a coil is wound in a cylindrical shape and a rotor made of a permanent magnet. An electromagnetic actuator adapted to reciprocate at least one blade disposed in the blade chamber is attached to the ground plane opposite to the blade chamber, and the outer periphery of the coil wound in a cylindrical shape In the blade driving device for a camera in which the surface is arranged in the escape hole provided in the base plate close to the surface on the blade chamber side of the base plate, the escape hole corresponds to at least the operating region of the blade. It is an object of the present invention to provide a camera blade driving device that allows only a region to be used as a penetrating region and effectively uses the cover plate side of the non-penetrating region, thereby increasing the degree of freedom in designing the device and reducing the size.

In order to achieve the above object, the present invention provides a ground plane having an opening for a photographing optical path, and at least one blade chamber between the ground plane having an opening for the photographing optical path. A cover plate, at least one blade that is disposed in the blade chamber and reciprocated to move back and forth in the photographing optical path, and a rotation axis perpendicular to the surface of the ground plate outside the blade chamber. The permanent magnet rotor is substantially U-shaped, and a coil is wound around one of the two leg portions in a cylindrical shape, with the tip portion of the two leg portions serving as a magnetic pole portion, and facing the circumferential surface of the rotor in at least one electromagnetic actuator, a camera blade drive device includes a reciprocally operating the blade by reciprocating rotation of the rotor have a yoke which is disposed to the blade to the base plate transmembrane region that penetrates down to room The through regions have been relief hole is formed consisting of a non-transmembrane region which is not penetrated to the said blade chamber is adjacent the cylindrical outer peripheral surface of the coil by inserting the coil into該逃down hole If you are on so that you arranged close to the surface of the blade chamber side of the base plate, the transmembrane region, have been formed in a predetermined region including the region corresponding to the operating range of at least the blade, the non the transmembrane region, said near the transmembrane region from the surface of the blade chamber side of the base plate is formed beam portion having a predetermined shape toward the cover plate side and the vane on the beams portion abuts a stopper To be provided . In that case, it is more preferable for downsizing of the apparatus if the beam portion regulates a part of the planar outer shape of the ground plane.

  Further, at least a part of the surface of the beam portion on the cover plate side may be formed as a receiving surface of the cover plate in order to regulate a gap between the ground plate and the cover plate. In that case, a shaft for fixing the cover plate by heat welding may be further provided on the receiving surface of the cover plate.

  Further, two blade chambers are configured by partitioning the ground plate and the cover plate with an intermediate plate, and at least a part of the surface of the beam portion on the cover plate side includes the ground plate and the intermediate plate. The intermediate plate may be formed as a receiving surface of the intermediate plate, and in that case, a shaft for fixing the intermediate plate with heat caulking is further provided on the receiving surface of the intermediate plate. It may be made to be.

  Further, two blade chambers are configured by partitioning the ground plate and the cover plate with an intermediate plate, and the beam portion is disposed at least between the intermediate plate and the cover plate. A blade mounting shaft for rotatably mounting the blade may be provided.

  Further, at least positioning pins for the cover plate may be provided on the beam portion, and two blade chambers are configured by partitioning the ground plate and the cover plate with an intermediate plate. The beam portion may be provided with at least a positioning pin for the intermediate plate.

  The present invention has an approximately U-shaped yoke in which a coil is wound in a cylindrical shape and a permanent magnet rotor, and is an electromagnetic that reciprocates at least one blade disposed in a blade chamber. The actuator is attached to the ground plane surface opposite to the blade chamber, and the outer circumferential surface of the coil wound in a cylindrical shape is close to the blade chamber side surface of the ground plate in the escape hole provided in the ground plate. In the camera blade driving device arranged as described above, the escape hole has at least a region corresponding to the operation region of the blade as a through region, and the other non-through region has a surface on the blade chamber side of the main plate. Since the beam portion having a predetermined shape is formed from the top to the cover plate, forming a stopper or the like there is an advantage that the degree of freedom of design is increased and the size can be reduced. is there.

  Embodiments of the present invention will be described with reference to three illustrated examples. As described above, the camera blade driving device of the present invention can be implemented as a single shutter device, diaphragm device, filter device, lens barrier device, or two or more of the shutter device, diaphragm device, and filter device. It can be implemented as a unit. However, it is needless to mention all those embodiments, and in the following, a single shutter device will be described as a first embodiment, and a shutter device and a filter device as a unit will be described as a second and third embodiment. Therefore, other embodiments will be appropriately described in the description of each example. 1 to 7 are for explaining the first embodiment, FIGS. 8 to 14 are for explaining the second embodiment, and FIGS. 15 to 19 are for explaining the third embodiment. It is for explaining.

  The camera blade driving device of the present embodiment is configured as a shutter device having two shutter blades. FIG. 1 is a front view showing a photographing standby state when employed in a digital camera, and FIG. 2 is a partial view showing only a part of the ground plane in the same manner as FIG. is there. 3 is a rear view of FIG. 1, and FIG. 4 is a rear view of FIG. FIG. 5 is a cross-sectional view showing the overlapping relationship of the constituent members of this embodiment in an easy-to-understand manner, and FIG. 6 is a cross-sectional view of only the main part of this embodiment. Further, FIG. 7 is a rear view showing the state immediately after photographing in the same manner as FIG.

First, the configuration of this embodiment will be described. The base plate 1 of the present embodiment is made of a synthetic resin and is a relatively thick member. As shown in FIG. 1, the planar shape is substantially rectangular. The base plate 1 is formed with a concave portion 1a having a large diameter in a region slightly lower left than the central portion, and an opening portion 1b for a photographing optical path centered on the optical axis is formed in the central portion. ing. Further, as shown in FIG. 3, a cover plate 2 which is a thin plate member and has substantially the same outer shape as the base plate 1 is provided on the back surface of the base plate 1 with a predetermined interval by means described later. The blade chamber is attached to the main plate 1. The cover plate 2 is also formed with an opening 2a for the photographing optical path centered on the optical axis. However, since the diameter of the opening 1b is smaller, the exposure opening of this embodiment is an opening. It is regulated by the part 1b. However, the diameter of the opening 2a may be reduced to restrict the exposure opening.

  Both surfaces of the ground plane 1 are formed in a complicated shape. First, as shown in FIGS. 1 and 2, two stator mounting shafts 1c and 1d are erected on the surface opposite to the blade chamber. Further, as can be seen from FIG. 2, a receiving portion 1e is formed at a level one step deeper from the reference plane in accordance with the shape of a yoke 6 having a substantially U shape, which will be described later. This is used as a housing portion 1 f of the rotor 3 described later. And in the accommodating part 1f, the rotor attachment axis | shaft 1g is erected and the arc-shaped escape hole 1h is formed as a through-hole to the blade chamber side.

  Further, as can be seen from FIG. 2, a rectangular relief hole 1i having one long side coincident with the outer peripheral edge of the main plate 1 is formed by cutting a part of the receiving portion 1e. . The escape hole 1i is a penetrating region in which a part of the planar region communicates with the blade chamber, and the other non-penetrating region has a predetermined thickness from the blade chamber side surface to the cover plate 2 side. It is formed as a beam portion 1j. In this embodiment, in order to reduce the planar outer shape of the main plate 1, the escape hole 1 i is formed adjacent to the outer peripheral edge of the main plate 1, and the beam portion 1 j is one of the outer peripheral edges of the main plate 1. However, the present invention is not limited to such a configuration, and may be formed so as not to be adjacent to the outer periphery as in Examples 3 and 4 of Patent Document 1, for example. Absent. The same applies to the following embodiments.

  Next, the configuration of the electromagnetic actuator will be described. First, the rotor 3 is rotatably mounted on the rotor mounting shaft 1g. The rotor 3 of this embodiment is made of a permanent magnet magnetized in two radial directions, and an output pin 3c is formed at the tip of an arm portion 3b protruding from a cylindrical main body portion 3a. doing. The output pin 3c is inserted into the blade chamber from the arc-shaped escape hole 1h. In the case of this embodiment, the arm 3b and the output pin 3c of the rotor 3 are also permanent magnets like the main body 3a, but the arm 3b and the output pin 3c are made of synthetic resin. Things are also known.

  The stator frame 4 of the present embodiment is made of synthetic resin, and has two plate-like portions 4a and 4b as shown in FIGS. 1 and 5 and a hollow bobbin portion formed therebetween. In the bobbin portion 4c, flanges 4c-1 and 4c-2 are formed at the boundary between the plate-like portions 4a and 4b. Further, mounting holes 4a-1 and 4b-1 are formed in the two plate-like portions 4a and 4b. A coil 5 is wound around the bobbin portion 4c so that the overall shape is cylindrical. Further, the yoke 6 is substantially U-shaped, and the tip ends of the two leg portions 6a and 6b serve as magnetic pole portions, and one leg portion 6a is inserted into the hollow bobbin portion 4c.

  The stator frame 4 in which the coil 5 is wound around the bobbin portion 4c and the yoke 6 is attached in this manner is attached to the base plate 1 by a processing method called heat welding. That is, the stator mounting shafts 1 c and 1 d erected on the base plate 1 have a cylindrical shape at the stage of manufacturing the base plate 1. Therefore, the mounting holes 4a-1 and 4b-1 formed in the plate-like portions 4a and 4b of the stator frame 4 are fitted to the cylindrical stator mounting shafts 1c and 1d. As a result, the yoke 6 is brought into contact with the receiving portion 1e, and the flanges 4c-1 and 4c-2 of the bobbin portion 4c and the coil 5 are brought close to the blade chamber side surface of the base plate 1. In this state, when the tips of the stator mounting shafts 1c and 1d protruding from the mounting holes 4a-1 and 4b-1 are heated and deformed into a flange shape, they are shown in FIGS. An installation configuration like this is obtained.

5 and 6, in such an electromagnetic actuator mounting state, the flanges 4c-1 and 4c-2 of the bobbin portion 4c and the outer peripheral surface of the coil 5 wound in a cylindrical shape are ground plates. Since it is inserted to the vicinity of the surface on the one blade chamber side, the dimension in the direction parallel to the optical axis in the attachment region of the electromagnetic actuator is extremely small. In addition, since the beam portion 1j is formed in the present embodiment, the two parts forming the short side of the escape hole 1i are formed by molding as compared with the case where the beam portion 1j is not formed. deformation which is made Dzu pleasure.

  As shown in FIGS. 3 and 7, the beam 1j is formed on the surface of the main plate 1 on the blade chamber side as described above, and the height of the beam 1j is the same as the thickness of the beam 1j. Now, three attachment portions 1k, 1m, and 1n of the cover plate 2 are formed. Therefore, the surface of the beam portion 1 j on the cover plate 2 side is also a receiving surface of the cover plate 2. However, the present invention is not limited to the case where the surface of the beam portion 1j on the cover plate 2 side is the receiving surface of the cover plate 2.

  Further, cover plate mounting shafts 1p, 1q, 1r are erected on the three mounting portions 1k, 1m, 1n. These cover plate mounting shafts 1p, 1q, and 1r are formed in a columnar shape like the cover plate mounting shaft 1p shown in FIG. The cover plate 2 has its mounting holes 2b, 2c, and 2d fitted to the cover plate mounting shafts 1p, 1q, and 1r, and then heats the tips of the cover plate mounting shafts 1p, 1q, and 1r to provide flanges. It is attached to the main plate 1 by being deformed into a shape.

  Further, a stopper 1s is formed on the beam portion 1j, and the tip thereof is inserted into the hole 2e of the cover plate 2. Furthermore, on the surface on the blade chamber side of the base plate 1, two blade mounting shafts 1t, 1u and three stoppers 1v, 1w, 1x are erected. Among them, the blade mounting shaft 1t is It also serves as a positioning pin when the cover plate 2 is attached to the main plate 1. The tips of the blade mounting shafts 1t and 1u are inserted into the holes 2f and 2g of the cover plate 2, and the tips of the stoppers 1v and 1x are inserted into the holes 2h and 2i of the cover plate 2, respectively.

  Two shutter blades 7 and 8 are arranged in the blade chamber. Among them, the shutter blade 7 arranged on the base plate 1 side has a long hole 7a and is rotatably attached to the blade attachment shaft 1t. The shutter blade 8 disposed on the cover plate 2 side has a long hole 8a and is rotatably mounted on the blade mounting shaft 1u. The output pin 3c of the rotor 3 described above is fitted in the long holes 7a and 8a of the shutter blades 7 and 8 in the blade chamber, and the tip is formed in a shape substantially the same as the escape hole 1h of the base plate 1. The plate 2 is inserted into the relief hole 2j.

  Next, the operation of this embodiment will be described with reference to FIGS. 1 and 3 show a shooting standby state when employed in a digital camera. In this state, the power switch of the camera is on, but the coil 5 is not energized. However, as is well known, at this time, the magnetic force of the main body portion 3a acts between the magnetic pole of the main body portion 3a of the rotor 3 and the magnetic pole portion of the yoke 6 disposed to face the peripheral surface. The rotor 3 is biased so as to rotate counterclockwise in FIG.

  Therefore, in FIG. 3, the shutter blade 7 is biased to rotate counterclockwise and the shutter blade 8 rotates clockwise, but the shutter blade 7 is rotated by the stopper 1v and the shutter blade 8 is rotated by the stopper 1w. It is blocked and this state is maintained. For this reason, subject light strikes a solid-state imaging device (not shown), and the photographer can observe the subject image on the monitor.

  When the release button is pressed at the time of shooting, the charge accumulated in the solid-state image sensor is released and shooting is started, and new charges are accumulated in the solid-state image sensor. When a predetermined time elapses, a forward current is supplied to the coil 5 by a signal from the exposure time control circuit. Accordingly, the rotor 3 is rotated in the clockwise direction in FIG. 1, and in FIG. 3, the shutter blade 7 is rotated in the clockwise direction, and the shutter blade 8 is rotated in the counterclockwise direction, and the opening 1b. Close. Immediately after closing the opening 1b, the shutter blade 7 contacts the stopper 1x, and the shutter blade 8 contacts the stopper 1s and is stopped. FIG. 7 shows the state at that time.

  Thereafter, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. When this is finished, a current in the reverse direction is supplied to the coil 5. Therefore, since the rotor 3 is rotated counterclockwise in FIG. 1, in FIG. 7, the shutter blade 7 is rotated counterclockwise, and the shutter blade 8 is rotated clockwise, and the opening 1b. Open up. Immediately after the opening 1b is fully opened, the shutter blade 7 contacts the stopper 1v, and the shutter blade 8 contacts the stopper 1w and is stopped. Thereafter, when the coil 5 is de-energized, the imaging standby state shown in FIGS. 1 and 3 is restored.

  As can be seen from the above description of the operation, in the configuration of the present embodiment, the planar outer shape of the main plate 1 is extremely reduced to reduce the size of the apparatus. Where it is difficult to arrange a stopper that abuts when the opening 1b is opened, the stopper 1s can be provided by forming the beam 1j.

  Note that the camera blade driving device of this embodiment is configured as a single shutter device having two shutter blades, but if the plane area of the shutter blade 7 of this embodiment is increased, the shutter blade 8 It becomes a shutter device provided with one shutter blade which is not provided with. Both the shutter device configured as in the present embodiment and the shutter device provided with one shutter blade can be directly employed in the camera as a lens barrier device. Further, the configuration of the shutter device including one shutter blade as described above can be used as a diaphragm device by forming an aperture having a diameter smaller than the exposure aperture in the shutter blade to form a diaphragm blade. is there. Furthermore, if the aperture of such a diaphragm blade is covered with a filter plate to form a filter blade, a filter device can be obtained. Further, the filter blades in that case can be those described in JP-A-2005-091656. Therefore, all of these devices are the blade driving device for a camera of the present invention.

  Next, Example 2 will be described with reference to FIGS. 8 to 14. The camera blade driving device of this example includes a shutter device including two shutter blades and one filter blade. The filter device is configured as one unit. 8 is a front view showing a photographing standby state, FIG. 9 is a partial view showing only a part of the main plate shown in FIG. 8, and FIG. 10 is a rear view of FIG. FIG. 11 is a rear view of FIG. 9. FIG. 12 is a cross-sectional view showing the overlapping relationship of the constituent members of the present example in an easy-to-understand manner, and FIG. 13 is a cross-sectional view of the main part of the present example. Further, FIG. 14 is a rear view showing a state immediately after the end of photographing in the same manner as FIG.

  First, the configuration of this embodiment will be described. The base plate 11 of the present embodiment is made of synthetic resin, and a concave portion 11a having a large diameter and an opening portion 11b for a photographing optical path are formed around the optical axis at a substantially central portion thereof. Further, in FIG. 10, an intermediate plate 12 that is thinner than the ground plane 11 and has a small planar outer shape is disposed on the near side of the ground plane 11, and is attached to the ground plane 11 by means not shown. The blade chamber of the filter blade 22 described later is configured. The intermediate plate 12 is also formed with a photographing optical path opening 12a having a diameter larger than that of the opening 11a with the optical axis as the center.

  Further, in FIG. 10, a cover plate 13 having substantially the same outer shape as that of the base plate 11 is disposed on the front side of the intermediate plate 12, and is attached to the base plate 11 by means described later. The blade chambers of two shutter blades 23 and 24, which will be described later, are configured. In FIGS. 10 and 14, a part of the cover plate 13 is formed so that a part of the blade chambers can be seen. Shown excised. The cover plate 13 is also formed with a photographing optical path opening 13 a centered on the optical axis, but the diameter is substantially the same as the opening 12 a of the intermediate plate 12. Therefore, in the case of the present embodiment, the opening 11b of the base plate 11 regulates the exposure opening. However, it goes without saying that the diameter of the opening 12a of the intermediate plate 12 and the opening 13a of the cover plate 13 may be minimized so as to restrict the exposure opening.

  Both surfaces of the base plate 11 are formed in a more complicated shape than the case of the base plate 1 of the first embodiment. And as FIG. 8 shows, the two electromagnetic actuators are attached to the surface of the ground plate 11 on the opposite side to a blade chamber. However, the configuration of these electromagnetic actuators and the mounting configuration to the main plate 11 are almost the same as those in the embodiment. Therefore, those configurations will be briefly described.

  First, a related configuration of the electromagnetic actuator arranged on the right side in FIG. 8 will be described. As shown in FIGS. 8 and 9, two stator mounting shafts 11c and 11d are erected on the surface of the base plate 11 on the side opposite to the blade chamber. Further, as can be seen from FIG. 9, a receiving portion 11e of a substantially U-shaped yoke 16 described later is formed one step deep from the reference plane, and a receiving portion 11f of the rotor 14 described later is formed deeper. It is formed in a keyhole shape. A rotor mounting shaft 11g is erected in the accommodating portion 11f, and an arc-shaped escape hole 11h is formed as a through hole to the blade chamber side.

  In addition, as can be seen from FIG. 9, a rectangular relief hole 11 i is formed so that one long side coincides with the outer peripheral edge of the main plate 11 by cutting a part of the receiving portion 11 e. . This escape hole 11i is a penetrating region in which a part of the planar region communicates with the blade chamber, and the other non-penetrating region is a beam portion having a predetermined thickness from the blade chamber side surface to the cover plate 13 side. 11j. In addition, although the planar shape of the penetration area | region of a present Example differs from the case of said Example 1, the main reason is the plane of the blade chamber comprised between the ground plane 11 and the intermediate | middle board 12. This is because the outer shape is different.

  The configuration of the electromagnetic actuator is different only in the shape of a part of the stator frame 4 in the first embodiment. First, the rotor 14 is rotatably attached to the rotor attachment shaft 11g. The rotor 14 includes a main body portion 14a made of a permanent magnet magnetized in two radial directions, an arm portion 14b, and an output pin 14c. The output pin 14c is inserted into the blade chamber from the arc-shaped escape hole 11h.

  The stator frame 15 is made of synthetic resin and includes two plate-like portions 15a and 15b and a hollow bobbin portion 15c formed between them. The bobbin portion 15c includes a flange 15c- 1,15c-2 is formed. The stator frame 15 is different from the plate parts 4a and 4b of the stator frame 4 of the first embodiment in the shape of the plate parts 15a and 15b. A coil 16 is wound around the bobbin portion 15c so that the overall shape is a cylindrical shape, and the yoke 17 has one leg portion with the tips of the two leg portions 17a and 17b as magnetic pole portions. 17a is inserted into the bobbin portion 15c.

The stator frame 15 in which the coil 16 is wound around the bobbin portion 15c and the yoke 17 is attached in this manner is the same as in the case of the stator frame 4 of the first embodiment. It is attached to 11c, 11d. In the attached state, as can be seen from FIGS. 13 and 14, the flanges 15 c-1 and 15 c-2 of the bobbin portion 15 c and the outer peripheral surface of the coil 16 wound in a cylindrical shape are the blades of the base plate 11. It is inserted to the vicinity of the chamber side surface. Therefore, as in the case of the first embodiment, the dimension in the direction parallel to the optical axis in the electromagnetic actuator mounting region is small. Also in the case of the present embodiment, since the beam portion 11j is formed, the two portions forming the short side of the escape hole 11i are compared with the case where the beam portion 11j is not formed. deformed by the molding process has Dzu pleasure.

  Next, although the structure of the electromagnetic actuator arrange | positioned at the left side in FIG. 8 and the attachment structure to the ground plane 11 are demonstrated, those structures are almost the same as the case of said electromagnetic actuator. Therefore, a brief description will be given focusing on the different points.

  On the base plate 11, two stator mounting shafts 11k and 11m are erected. Further, a receiving portion 11n of a yoke 21 to be described later is formed one step deep from the reference plane, and a receiving portion 11p of a rotor 18 to be described later is formed in a keyhole shape at a deeper position. And in the accommodating part 11p, the rotor attachment axis | shaft 11q is standingly arranged, and the circular arc-shaped escape hole 11r is formed as a through-hole to the blade chamber side. In FIG. 8, the escape hole 11r and the stator mounting shaft 11m are shown to overlap each other, but are only shown as such because the illustration in FIG. 8 is difficult. Actually, as shown in FIG. 12, the base plate 11 is formed with a flange portion 11t so as to cover a part of the escape hole 11r, and the stator mounting shaft 11m is formed on the flange portion 11t. It is erected.

  In addition, a rectangular relief hole 11 s is formed so that a part of the receiving portion 11 n of the yoke 21 is cut so that one long side coincides with the outer peripheral edge of the main plate 11. The escape hole 11s does not have a through region unlike the escape hole 11i. This is because, as can be seen from FIG. 12, there is no blade chamber formed between the base plate 11 and the intermediate plate 12 on the surface opposite to the surface where the escape hole 11s is formed. Even if the escape hole 11s has the same depth as the escape hole 11i, a through hole cannot be formed.

  The rotor 18 of this electromagnetic actuator is also composed of a permanent magnet main body 18a magnetized in two radial directions, an arm 18b, and an output pin 18c, and the rotor mounting shaft 11q. The output pin 18c is inserted into the blade chamber through the arc-shaped escape hole 11r.

  The stator frame 19 includes two plate-like portions 19a and 19b and a hollow bobbin portion 19c formed therebetween. The bobbin portion 19c includes flanges 19c-1 and 19c-2. However, the stator frame 19 differs from the plate-like portions 15a and 15b of the stator frame 15 only in the shape of the plate-like portions 19a and 19b. A coil 20 is wound around the bobbin portion 19c so that the overall shape is cylindrical, and the yoke 21 has one leg portion with the tips of the two leg portions 21a and 21b as magnetic pole portions. 21a is inserted into the bobbin portion 19c. The stator frame 19 in a state where the coil 20 is wound around the bobbin portion 19c and the yoke 21 is attached is attached to the stator attachment shafts 11k and 11m of the base plate 11 by heat welding.

  Although the beam portion 11j is formed on the surface of the base plate 11 on the blade chamber side as described above, the beam portion 11j of this embodiment is a single beam portion like the beam portion 1j in the first embodiment. 10 and 14, as shown in FIG. 10 and FIG. 14, it is the same dimension as the thickness of the beam part 11j and surrounds the opening part 11b so that it is clockwise from the upper left part. It is formed up to the lower part and is formed as if it is a part of the attachment part 11A. However, it may be formed independently of the other attachment portion 11A. In the present embodiment, the surface of the attachment portion 11A on the cover plate 13 side is the receiving surface of the intermediate plate 12, so that the surface of the beam portion 11j on the cover plate 13 side is naturally also the intermediate plate. 12 receiving surfaces. 10 and 14, the receiving portion 11 </ b> B formed in the lower left portion also has a receiving surface of the intermediate plate 12 on the surface on the cover plate 13 side.

  10 and 14, a lower left portion is formed with a mounting portion 11C that is one step higher than the mounting portion 11A, and a right side portion has a mounting portion 11D at the same height as the mounting portion 11C. Is formed. Cover plate mounting shafts 11E, 11F, and 11G are erected on the mounting portions 11C and 11D. Further, a receiving portion 11H is formed in the upper left portion, and the receiving portion 11H and the surface on the cover plate 13 side of the cover plate mounting shafts 11E, 11F, 11G are the receiving surface of the cover plate 13. It has become.

  A blade mounting shaft 11J, a positioning pin 11K of the cover plate 13, and stoppers 11L and 11M are erected on the surface of the base plate 11 on the blade chamber side, and a stopper 11N is erected on the boundary with the mounting portion 11A. Has been. In addition, the blade mounting shafts 11Q and 11R, the positioning pin 11S of the intermediate plate 12, and the stopper 11T are erected on the mounting portion 11A, and the stoppers 11U and 11V are erected on the boundary with the mounting portion 11D. ing. Among them, the positioning pin 11S and the stopper 11T of the intermediate plate 12 are erected on the beam portion 11j, as is apparent from FIG.

  The intermediate plate 12 has the hole 12b firmly fitted to the positioning pin 11S, the hole 12c to the positioning pin 11K, the hole 12d to the blade mounting shaft 11J, the hole 12e to the stopper 11N, and the hole 12f to the stopper. 11T, the hole 12g is fitted to the stopper 11M, the hole 12h is loosely fitted to the blade attachment shaft 11Q, and the hole 12i is loosely fitted to the blade attachment shaft 11R, and attached to the base plate 11 by means not shown.

  Further, the cover plate 13 has the hole 13b firmly fitted to the positioning pin 11K, the hole 13c to the positioning pin 11S, the hole 13d to the blade mounting shaft 11J, the hole 13e to the stopper 11N, and the hole 13f to the stopper. 11T, the hole 13g is loosely fitted to the stopper 11M, the hole 13h is loosely fitted to the blade attachment shaft 11Q, the hole 13i is fitted to the blade attachment shaft 11R, the hole 13j is fitted to the stopper 11U, and the hole 13k is loosely fitted to the stopper 11V. The cover plate 13 is attached to the base plate 11 by heat welding as described above by fitting the holes 13m, 13n, and 13p to the cover plate mounting shafts 11E, 11F, and 11G.

  In the blade chamber formed between the main plate 11 and the intermediate plate 12, filter blades 22 that operate substantially as one sheet are arranged. This filter blade 22 is a filter blade having a three-layer structure as described in JP-A-2005-091656, and two opaque blade members sandwich the blade member of the ND filter sheet. In the two opaque blade members, an opening 22a having a diameter smaller than that of the opening 11b is formed. The filter blade 22 has a long hole 22b and is rotatably attached to the blade attachment shaft 11J. Further, the output pin 14 c of the rotor 14 is fitted into the long hole 22 b of the filter blade 22, and the tip portion thereof has the same shape as the escape hole 11 h formed in the intermediate plate 12 and the cover plate 13. Are inserted into the relief holes 12j and 13q.

  In the filter blade 22 of this embodiment, the diameter of the opening 22a is smaller than that of the opening 11b. However, as is well known, the diameter of the opening 22a may be the same as or larger than the opening 11b. I do not care. Further, in this embodiment, such a three-sheet superposed structure is used as a filter blade, but as is well known, an opening is formed in one blade and the opening is covered so as to cover the opening. A filter blade may be attached. Further, if the diameter of the opening of such a single filter blade is made smaller than that of the opening 11b and the ND filter sheet is not attached, a known diaphragm blade can be obtained. If this is replaced with such a diaphragm blade, this embodiment becomes a camera blade drive device in which the shutter device and the diaphragm device are unitized. Therefore, the camera blade driving device thus configured is also the camera blade driving device of the present invention. These are also true for Example 3 below.

  In addition, two shutter blades 23 and 24 are disposed in a blade chamber formed between the intermediate plate 12 and the cover plate 13. Among them, the shutter blade 23 arranged on the intermediate plate 12 side has a long hole 23a and is rotatably attached to the blade attachment shaft 11Q. The shutter blade 24 arranged on the cover plate 13 side has a long hole 24a, and is rotatably attached to the blade attachment shaft 11R. The output pin 18c of the rotor 18 is inserted into the escape hole 12k of the intermediate plate 12 formed in the same shape as the escape hole 11r, and the long holes 23a of the shutter blades 23, 24 are inserted in the blade chamber. 24a is fitted, and the tip thereof is inserted into an escape hole 13r formed in the cover plate 13 and having the same shape as the escape hole 12k.

  Next, the operation of this embodiment will be described with reference to FIGS. 8 and 10 show a shooting standby state. In this state, the power switch of the camera is on, but the coils 16 and 20 are not energized. However, at this time, the magnetic force of the rotors 14 and 18 acts between the main body portions 14a and 18a of the rotors 14 and 18 and the magnetic pole portions of the yokes 17 and 21 disposed so as to face the peripheral surfaces thereof. In FIG. 8, the rotors 14 and 18 are urged so as to rotate counterclockwise.

  Therefore, in FIG. 10, the filter blade 22 is biased to rotate counterclockwise, the shutter blade 23 is biased to rotate counterclockwise, and the shutter blade 24 rotates clockwise. However, the rotation of the filter blade 22 is blocked by the stopper 11T, and the rotation of the shutter blades 23 and 24 is blocked by the stoppers 11U and 11N, so that the opening 11b (exposure opening) is fully opened. State is maintained. For this reason, a solid-state image sensor (not shown) is exposed to subject light, and the photographer can observe the subject image on the monitor.

  When the release button is pressed at the time of shooting, in the initial stage, first, subject light is measured by the photometry circuit, and if it is determined that shooting is performed without dimming the subject light based on the result, the shutter blades 23, 24 are used. However, if it is determined that the subject light is dimmed, the filter blade 22 is first activated, and then the shutter blades 23 and 24 are activated.

  Therefore, first, when the release button is pressed at the time of shooting, when it is determined that the subject light is dimmed according to the measurement result of the photometry circuit, first, a forward current is supplied to the coil 16. The Thereby, the rotor 14 is rotated clockwise in FIG. Therefore, in FIG. 10, the output pin 14c rotates the filter blade 22 in the clockwise direction. When the center of the opening 22a reaches the center of the opening 11b, the filter blade 22 is brought into contact with the stopper 11L and stopped.

  In this state, as in the case of the first embodiment, the charge accumulated in the solid-state image sensor is immediately released, photographing is started, and new charges are accumulated in the solid-state image sensor. When a predetermined time elapses, a current in the reverse direction is supplied to the coil 20 by a signal from the exposure time control circuit, so that the rotor 18 is rotated clockwise in FIG. Therefore, in FIG. 10, the output pin 18c rotates the shutter blade 23 in the clockwise direction and rotates the shutter blade 24 in the clockwise direction to perform the closing operation of the opening portion 11b. Then, immediately after the opening 11b is closed, the closing operation is stopped when the shutter blade 23 comes into contact with the stopper 11M and the shutter blade 24 comes into contact with the stopper 11V. FIG. 14 shows the state at that time.

  Thereafter, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. When this is finished, a reverse current is supplied to the coil 16 and a forward current is supplied to the coil 20. As a result, the rotors 14 and 18 are rotated in the opposite direction. Therefore, in FIG. 14, the filter blade 22 is rotated counterclockwise, the shutter blade 23 is rotated counterclockwise, and the shutter blade 24 is rotated clockwise. When the opening 11b is fully opened, immediately after that, the filter blade 22 contacts the stopper 11T, and the shutter blades 23 and 24 contact the stoppers 11U and 11N and stop. Thereafter, when the energization of the coils 16 and 20 is cut off, the imaging standby state shown in FIGS. 8 and 10 is restored.

  Next, a brief description will be given of the operation when it is determined that the subject light is not dimmed according to the measurement result of the photometry circuit when the release button is pressed during shooting. In this case, the filter blade 22 is not operated as described above, and actual photographing is immediately started while the state of FIG. 10 is maintained. When a predetermined time elapses, a current in the reverse direction is supplied to the coil 20 by a signal from the exposure time control circuit, and the shutter blades 23 and 24 are closed as described above. Further, when the closing operation of the shutter blades 23 and 24 is completed and the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information, a forward current is supplied to the coil 20 as described above. Thus, the opening operation of the shutter blades 23 and 24 is performed. Then, after the opening operation of the shutter blades 23 and 24 is completed, when the power supply to the coil 20 is cut off, the photographing standby state shown in FIG. 10 is restored.

  In this embodiment, only the filter blade 22 has been operated in the state shown in FIG. 14, and the shutter blade 23 on the intermediate plate 12 side is still closed as shown in FIG. When it has not started, they will not overlap at all on the plane. Therefore, if the intermediate plate 12 is not present, the shutter blade 23 collides with the filter blade 22 when the shutter blade 23 starts closing operation from such a state. For this reason, the intermediate plate 12 is provided in the present embodiment, but the intermediate plate 12 is not necessarily required as long as a part of both the blades 22 and 23 can be kept in contact with each other.

  Further, even if a part of both the blades 22 and 23 are always kept in contact with each other, the presence of the filter blade 22 is present when shooting without dimming the subject light and when shooting with dimming. Since the position changes, the contact area between the two immediately before the closing operation of the shutter blade 23 starts is different. For this reason, the frictional resistance at the start of the closing operation of the shutter blades 23 is also different. However, if this need not be taken into consideration, the intermediate plate 12 is not necessary. Therefore, the camera blade driving device of the present invention does not necessarily include the intermediate plate even if the shutter device and the filter device are unitized. This also applies to the case where the shutter device and the diaphragm device are unitized as described above, and the same applies to the case where the shutter blades are configured as one sheet.

  Next, the third embodiment will be described with reference to FIGS. 15 to 19. FIG. 8 used in the description of the second embodiment is also used for the description of the present embodiment as it is. FIG. 15 is a partial view showing only a part of the ground plane of the present embodiment when viewed as shown in FIG. 8 as shown in FIG. FIG. 16 is a rear view of the present embodiment shown in FIG. 10, FIG. 17 is a rear view of FIG. 15, and FIG. 18 is a cross-sectional view of the main part of the present embodiment. It is. Further, FIG. 19 is a rear view showing the state immediately after the end of photographing in the same manner as FIG.

  In the present embodiment, like the camera blade driving device of the second embodiment, a shutter device including two shutter blades and a filter device including one filter blade are configured as one unit. is there. The present embodiment and the second embodiment described above are only partially different in configuration, and most of the configurations are the same. Therefore, in each drawing, the same reference numerals are given to substantially the same members and the same parts as those in the second embodiment. Therefore, in the following description, the configuration different from the case of the second embodiment will be mainly described, and the description of the same configuration is omitted.

  The base plate 11 of the present embodiment is formed on the opposite side of the blade chamber as in the second embodiment, but as shown by the broken line in FIG. 15, the beam portion 11j on the blade chamber side. The shape is different as will be described later. Two electromagnetic actuators having the same configuration as that of the second embodiment are similarly attached to the surface of the base plate 11 opposite to the blade chamber, and the output pins 14c of the rotors 14 and 18 are attached. 18c is inserted into the escape holes 11h and 11r. Further, in FIG. 16, the intermediate plate 12 is attached to the front side of the base plate 11 by means not shown, and the blade chamber of the filter blade 22 is configured between the base plate 11 and the same as in the case of the second embodiment. doing.

  In FIG. 16, a cover plate 13 is attached to the front side of the intermediate plate 12 by means to be described later, and two shutters having different shapes from the case of the second embodiment are provided between the cover plate 13 and the intermediate plate 12. Although the blade chambers of the blades 23 and 24 are configured, in FIGS. 16 and 19, a part of the cover plate 13 is cut away so that a part of the blade chamber can be seen. The output pins 14c and 18c of the rotors 14 and 18 have arc-shaped escape holes 12j and 13q provided in the intermediate plate 12 and the cover plate 13 in exactly the same manner as in the second embodiment. 12h and 13r are inserted.

  The beam portion 11j is formed on the surface of the base plate 11 on the blade chamber side as described above, but the beam portion 11j of the present embodiment is shown in FIG. Thus, it consists of the thin part 11j-1 and the thick part 11j-2. And the thin part 11j-1 is formed as a part of 11 A of attachment parts similarly to the case of Example 2, and uses the surface at the side of the cover board 13 as the receiving surface of the intermediate board 12, However, The intermediate board 12 The positioning pin 11S is moved toward the positioning pin 11K of the cover plate 13 and is erected. Instead, the blade mounting shaft 11Q in the second embodiment is erected. Further, the thick portion 11j-2 is connected to the receiving portion 11H in the second embodiment and is formed to have the same height. Therefore, the surface of the thick part 11j-2 on the cover plate 13 side is a receiving surface of the cover plate 13, and a cover plate mounting shaft 11W is newly provided on the surface.

  Since the beam portion 11j of the present embodiment is formed as described above, the shapes of the intermediate plate 12 and the cover plate 13 are slightly different from those of the second embodiment. That is, the outer shape of the intermediate plate 12 in contact with the beam portion 11j is different, and the formation positions of the holes 12b and 12h are moved. Further, the cover plate 13 is also provided with a hole 13s in addition to the positions where the holes 13c and 13h are formed, and by fitting the hole 13s to the cover plate mounting shaft 11W, heat caulking is performed. Is attached by. Thus, in this embodiment, since the cover plate 13 is attached to the base plate 11 at four locations, the cover plate 13 is firmly attached to the base plate 11 and the shutter blades 23 and 24 operate stably. Can be obtained.

In the case of the present embodiment, the stopper 11M that contacts when the shutter blades 23 are closed and the stopper 11V that contacts when the shutter blades 24 close are not provided in the second embodiment. A stopper 11X common to the shutter blades 23 and 24 is provided. Therefore, the intermediate plate 12 of the present embodiment is not provided with the hole 12g in the second embodiment, but instead is provided with a hole 12m, and the cover plate 13 has the holes 13g and 13k in the second embodiment. It is not provided, and instead of the hole 13g, a hole 13t having the same shape as the hole 12m is provided. Further, the stopper 11U that abuts when the shutter blade 23 is opened is moved downward as compared with the second embodiment. Therefore, the hole 13j of the cover plate 13 in the second embodiment is also moved together, but is not shown in FIGS. 16 and 19 because a part of the cover plate 13 is cut off.

  Further, as described above, the shutter blades 23 and 24 of the present embodiment are different in shape from those of the second embodiment. Therefore, as can be seen from FIGS. 16 and 19, the planar shape of the attachment portion 11 </ b> D is changed, and the blade chambers of the shutter blades 23 and 24 are small. Therefore, the outer shape of the intermediate plate 12 is also changed in accordance with the shape of the blade chamber. The members and parts not described above are the same as those in the second embodiment. As can be seen from FIG. 18, the beam portion 11j of the present embodiment has a surface that is opposite to the cover plate 13 side, and does not hinder the coil 16 from approaching the blade chamber side surface. The reinforcing portion 11j-3 having a substantially triangular cross section is formed along the long side of the escape hole 11i. If such a portion is formed, the strength of the reinforcing portion 11j is reduced even if the beam portion 11j is thin. Will be supplemented.

  The configuration of the present embodiment is as described above, but its operation is almost the same as that of the second embodiment. That is, when the filter blade 22 reciprocally rotated by the output pin 14c is rotated in the clockwise direction from the photographing standby state in FIG. 16, the filter blade 22 contacts the stopper 11L and is stopped in the state in FIG. When it is rotated in the direction, it comes into contact with the stopper 11T and returns to the state shown in FIG. Further, when the shutter blades 23 and 24 that are reciprocally rotated in opposite directions simultaneously by the output pin 18c are closed from the photographing standby state of FIG. 16, they come into contact with the common stopper 11X, and in the state of FIG. When it is stopped and then opened, it is brought into contact with the stoppers 11U and 11N and returned to the state shown in FIG.

  The operation in the case of shooting with the subject light dimmed and the operation in the case of shooting without dimming the subject light are performed according to the case of the second embodiment. Therefore, description of their operation is omitted.

  In each of the above embodiments, the coils 5, 16, 20 are wound around the bobbin portions 4c, 15c, 19c of the stator frames 4, 15, 19; , 19 may be wound around a bobbin independent of the leg, and the bobbin may be fitted to the leg portions 6a, 17a, 21a of the yokes 6, 17, 21. Without forming the bobbin portions 4c, 15c, and 19c on the 15 and 19 or having an independent bobbin, the coils 5, 16, and 20 are used as air-core coils, and the air-core coils are connected to the yokes 6, 17, and 21, respectively. You may make it fit directly on leg part 6a, 17a, 21a.

It is the front view which showed the imaging | photography standby state when the blade drive apparatus for cameras of Example 1 comprised as a single shutter apparatus was employ | adopted for the digital camera. FIG. 2 is a partial view showing only a part of a ground plate used in Example 1 in the same manner as in FIG. 1. It is a rear view of FIG. FIG. 3 is a rear view of FIG. 2. It is sectional drawing which showed clearly the overlapping relationship of the structural member of Example 1. FIG. 3 is a cross-sectional view of a main part of Example 1. FIG. It is the rear view of Example 1 which showed the state immediately after imaging | photography. It is the front view which showed the imaging | photography standby state in case the camera blade | wing drive apparatus of Example 2 which united the shutter apparatus and the filter apparatus was employ | adopted for the digital camera. FIG. 9 is a partial view showing only a part of a base plate used in Example 2 in the same manner as in FIG. 8. It is a rear view of FIG. FIG. 10 is a rear view of FIG. 9. It is sectional drawing which showed clearly the overlapping relationship of the structural member of Example 2. FIG. 6 is a cross-sectional view of a main part of Example 2. FIG. It is the rear view of Example 2 which showed the state immediately after completion | finish of imaging | photography. FIG. 10 is a partial view showing only a part of the base plate used in Example 3 in the same manner as in FIG. 9. It is a rear view of Example 3 shown as FIG. FIG. 16 is a rear view of FIG. 15. 6 is a cross-sectional view of a main part of Example 3. FIG. It is the rear view of Example 3 which showed the state immediately after completion | finish of imaging | photography.

Explanation of symbols

1,11 Ground plate 1a, 11a Recessed part 1b, 2a, 11b, 12a, 13a, 22a Opening part 1c, 1d, 11c, 11d, 11k, 11m Stator mounting shaft 1e, 11e, 11n, 11B, 11H Receiving part 1f, 11f , 11p Housing portion 1g, 11g, 11q Rotor mounting shaft 1h, 1i, 2j, 11h, 11i, 11r, 11s, 12j, 12k, 13q, 13r Escape hole 1j, 11j Beam portion 1k, 1m, 1n, 11A, 11C , 11D Mounting portion 1p to 1r, 11E to 11G, 11W Cover plate mounting shaft 1s, 1v to 1x, 11L to 11N, 11T to 11V Stopper 1t, 1u, 11J, 11Q, 11R, 11X Blade mounting shaft 2, 13 Cover plate 2b, 2c, 2d, 4a-1, 4b-1 mounting holes 2e-2i, 12b-12i, 12m, 3d-13k, 13 , 13n, 13p, 13s, 13t Hole 3, 14, 18 Rotor 3a, 14a, 18a Body 3b, 14b, 18b Arm 3c, 14c, 18c Output pin 4, 15, 19 Stator frame 4a, 4b, 15a , 15b, 19a, 19b Plate-like part 4c, 15c, 19c Bobbin part 4c-1, 4c-2, 15c-1, 15c-2, 19c-1, 19c-2 Flange 5, 16, 20 Coil 6, 17, 21 Yoke 6a, 6b, 17a, 17b, 21a, 21b Leg 7, 8, 23, 24 Shutter blade 7a, 8a, 22b, 23a, 24a Long hole 11j-1 Thin part 11j-2 Thick part 11j-3 Reinforcement Part 11t collar part 11K, 11S positioning pin 12 intermediate member 22 filter blade

Claims (9)

A main plate having an opening for a photographing optical path;
A cover plate having an opening for a photographing optical path and forming at least one blade chamber with the base plate;
At least one blade disposed in the blade chamber and moved back and forth in the photographing optical path by being reciprocated;
A permanent magnet rotor and a substantially U-shaped rotor arranged on the outer surface of the blade chamber on the outer surface of the blade chamber, and a coil is wound around one of the two legs to form a cylinder. At least one electromagnetic actuator that has a yoke that is disposed with the tip portion of the portion as a magnetic pole portion and opposed to the circumferential surface of the rotor, and that reciprocates the blades by reciprocating rotation of the rotor;
In a camera blade drive device comprising :
The said base plate be formed relief holes consisting of a non-transmembrane region which is not penetrated to the said blade chamber adjacent to the transmembrane region and the through region penetrates to the blade chamber, said coil該逃down hole a cylindrical outer peripheral surface of the coil by inserting have to so that you arranged close to the surface of the blade chamber side of the base plate,
The penetrating region is formed in a predetermined region including a region corresponding to at least the operating region of the blade,
Wherein the non-transmembrane region, said near the transmembrane region from the surface of the blade chamber side of the base plate is formed beam portion having a predetermined shape toward the cover plate side and the vane on the beams part those A blade driving device for a camera, characterized in that a stopper is provided in contact therewith.   The camera blade driving device according to claim 1, wherein the beam portion regulates a part of a planar outer shape of the base plate.   The at least part of the surface of the beam portion on the cover plate side is formed as a receiving surface of the cover plate in order to regulate a distance between the ground plate and the cover plate. Or the blade drive device for cameras of 3.   The camera blade driving device according to claim 3, wherein a shaft for fixing the cover plate by heat welding is provided on a receiving surface of the cover plate.   Two blade chambers are configured by partitioning the ground plate and the cover plate with an intermediate plate, and at least a part of the surface of the beam portion on the cover plate side is an interval between the ground plate and the intermediate plate The blade driving device for a camera according to claim 1, wherein the blade driving device is formed as a receiving surface of the intermediate plate.   The camera blade driving device according to claim 5, wherein a shaft for fixing the intermediate plate by heat welding is provided on a receiving surface of the intermediate plate. Two blade chambers are configured by partitioning the ground plate and the cover plate with an intermediate plate, and at least the blades disposed between the intermediate plate and the cover plate are disposed on the beam portion. The blade driving device for a camera according to claim 1, wherein a blade mounting shaft for rotatably mounting is provided. Before Kihari part, at least, the camera blade drive device according to claim 1 or 2, characterized in that the positioning pins of the cover plate is provided. The space between the base plate and the cover plate is divided by an intermediate plate to form two blade chambers , and at least a positioning pin for the intermediate plate is provided in the beam portion. The blade driving device for a camera according to 1 or 2.

Images