JP4549196B2 - Camera blade drive - Google Patents

Description

  The present invention relates to a camera blade drive device in which blade members such as shutter blades and diaphragm blades are driven by a motor.

  Each of the shutter device, the diaphragm device, and the filter device employed in the camera has one or a plurality of blade members. Among them, in the case of a shutter device, recently, there are many shutter blades, and digital cameras (digital still cameras, digital video cameras, cameras incorporated in information terminal devices such as mobile phones, etc.) Of these, only a single camera is used in a relatively small camera. When the shutter blade is configured as one sheet, it is normal to open and close the exposure opening by reciprocatingly rotating the shutter blade. However, when the shutter blade is configured as two sheets, to open and close the exposure opening, There are one in which two blades are reciprocated in opposite directions and one in which the two blades are linearly reciprocated in opposite directions.

  In the case of an aperture device, recently, with the advent of digital cameras, one aperture blade having a circular opening smaller than the exposure aperture is moved forward and backward as necessary. However, there is also one that restricts the aperture opening by the cooperation of two aperture blades. When the diaphragm blade is configured as a single sheet, there are two types, one for reciprocating rotation of the diaphragm blade and the other for linearly reciprocating to advance and retract the exposure aperture. There are one that reciprocally rotates two blades in opposite directions and one that linearly reciprocates in opposite directions.

  Further, in the case of a filter device, it is usual that at least one filter blade is moved forward and backward as necessary to the exposure opening. Similar to the aperture blade, it has a circular opening (however, it may be approximately the same size as the exposure opening), and an ND filter plate is attached so as to cover the opening in the vicinity of the opening. The filter blade is composed only of the ND filter plate or the ND filter plate, and the ND filter plate is sandwiched between two blades having a circular opening so that the three are as if they were one blade. In some cases, they are simultaneously reciprocated at the same operating angle.

  By the way, recently, each blade member as described above is usually driven by an electromagnetic actuator, and one of the electromagnetic actuators has a configuration as described in Patent Document 1 below. A current-controlled motor is known. This motor is called a moving magnet (type) motor or the like, and the rotor has a permanent magnet that is magnetized in the radial direction (often in the case of two poles). When reciprocating within an angular range, one or two output pins (also referred to as drive pins) provided integrally therewith cause the blade member to reciprocate. Moreover, one or two coils are wound around the two stator members bearing the rotor so as to surround the bearing portions. When there is one coil, the current supply direction is switched, and the rotor is rotated by a predetermined angle in a direction corresponding to the supply direction. When there are two coils, normally, currents in opposite directions are simultaneously supplied to both of them, and the rotor is stopped at a position where the rotational forces are balanced.

  In addition, in this type of current control type motor, the stop position of the rotor is difficult to stabilize in a state where the coil is not energized. Therefore, in order to ensure that the blade member can start operating from a predetermined initial position every time shooting is performed, the position of the blade member is detected by a Hall element or a photo sensor before shooting, and the blade member is shifted from the initial position. It is known that when it is in the position, imaging is started after the coil is energized to return to the initial position. Further, as described in Patent Document 1, a magnetic member is attached to the stator side facing the magnetic pole of the rotor so that the blade member can maintain a stable state at the initial position, and the coil Even when the current is not energized, there is also known one that stabilizes the stop position of the rotor by the attractive force acting between the magnetic member and the permanent magnet of the rotor. Even if such a magnetic body member is arranged not to face the circumferential surface of the rotor but to face at least one of the axial end faces of the rotor, the same effect can be obtained.

Japanese Utility Model Publication No. 7-19740

  By the way, as described in Patent Document 1, the rotor of the motor described above is rotatably fitted in the holes formed in the two stator members as described in Patent Document 1. Or a hole is formed in the center of the end face of the rotor, and a shaft provided on the stator member is rotatably fitted therein to be supported. The position in the radial direction is restricted by the peripheral surface or the outer peripheral surface of the shaft. However, since the two stator members are in a bearing state in which the rotor is housed inside, the coils are wound around the outer sides of the rotor members, so that the stator members are positioned. When the coil is wound, if the relative position of the two bearing portions is slightly deviated, there may be a problem in the rotation of the rotor after manufacture. If such a defect is discovered, the coil must be rewound and then wound again. Conventionally, the processing accuracy and relative positioning accuracy of the two bearing portions are increased. In addition, when the rotor is assembled or the coil is wound, the work is performed with great care so as not to shift the position of the rotor.

  The present invention has been made in order to solve such problems, and the object of the present invention is to provide a radial bearing of a rotor, a shaft and a hole at the center of rotation of the rotor as in the prior art. It is an object to provide a camera blade drive device that is easy to assemble so that it can be dispensed with.

  In order to achieve the above object, a camera blade drive device according to the present invention is a closed body having at least one blade member attached so as to be capable of reciprocating with respect to a base plate, and a thrust receiving surface at one end in an axial direction. A cylindrical first stator member having a wall and an opening at the other end, and a thrust receiving surface in a region that closes the opening and faces the thrust receiving surface of the first stator frame. A second stator frame having at least one of the first stator frame attached to the main plate, and a substantially cylindrical yoke attached to the inner peripheral surface of the first stator member. A cylindrical portion having at least one coil wound around the outer side of the two stator frames so as to surround the two thrust receiving surfaces, a cylindrical portion having a permanent magnet magnetized in the radial direction, and the cylindrical portion At least provided integrally with The cylindrical portion is composed of one output pin, and a part of both end faces in the axial direction are in contact with the two thrust receiving faces, and a part of the circumferential face protrudes in a ring shape over the entire circumference. And at least one projecting portion in contact with the inner peripheral surface of the yoke, the output pin extending to the outside of the two stators and connected to the blade member. To.

  In that case, when the yoke has a substantially rectangular opening or a cut-out part in which at least one of the axial directions is opened over a predetermined angle range equal to or larger than the rotation angle of the rotor, The rotor can be suitably positioned when no power is supplied. Further, the protrusion may be formed in a ring shape by a plurality of protrusions arranged at a predetermined interval, and at least on a circumferential surface in the vicinity of both ends in the axial direction of the cylindrical portion. One by one may be formed. Further, in the rotor, the central shaft portion of the cylindrical portion, the protruding portion, and the output pin may be made of a synthetic resin material, or all are made as permanent magnets. You may do it.

  In the present invention, in order to provide a radial bearing for a rotor, a shaft and a hole are provided in the center of both end faces of the rotor as in the prior art, or a hole and a shaft to be fitted to two stators are provided. Therefore, when assembling the rotor or winding the coil, it is not necessary to pay much attention to the positional deviation between the two stator members, and the assembly work is facilitated.

  Embodiments of the present invention will be described with reference to four illustrated examples. As described above, the present invention can be applied to any of the shutter device, the diaphragm device, and the filter device. However, it is not necessary to explain all of these devices. Of these devices, a case will be described in which the shutter device is configured to include two shutter blades that rotate in opposite directions. Even if the shutter device has the same configuration, the operation sequence differs depending on whether the shutter device is used in a digital camera or a camera using a silver salt film, but both must be explained. Since I think that there is no, I will explain the case where it is adopted in a digital camera.

  This embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a plan view showing a fully opened state of the shutter blades, and FIG. 2 is a cross-sectional view showing a main part of FIG. FIG. 3 is a perspective view showing the shape of the yoke of this embodiment, and FIG. 4 is a plan view showing the closed state of the shutter blades. First, the configuration of the present embodiment will be described with reference to FIGS. As can be seen from FIG. 1, the ground plate 1 having a circular outer shape is made of synthetic resin and has a circular subject optical path opening 1a at the center. Although not shown in figure, this ground plate 1 is attached with an auxiliary ground plate having substantially the same outer shape as the ground plate 1 at a predetermined interval on the back side thereof, and constitutes a blade chamber between them. . Further, the auxiliary base plate also has an opening for a subject optical path having a circular shape at the center, but in the following description, it is assumed that the opening 1a of the base plate 1 regulates the exposure opening.

  The base plate 1 is formed with a relatively large slot 1b in addition to the opening 1a. Further, two positioning pins 1c and 1d are provided on the surface outside the blade chamber of the base plate 1, and two shafts 1e and 1f and two stopper pins 1g and 1h are provided on the surface inside the blade chamber. ing. Two shutter blades 2 and 3 are arranged in the blade chamber. Among them, the shutter blade 2 has a long hole, and a hole formed in the vicinity thereof is rotatably fitted to the shaft 1e, but also has a known shape, Those slots and holes are not labeled. Further, the shutter blade 3 has long holes, and the holes formed in the vicinity thereof are rotatably fitted to the shaft 1f. No sign.

  A motor is attached to the surface outside the blade chamber of the base plate 1 as a driving means for the shutter blades 2 and 3. The motor of the present embodiment is a current in which a rotor having a permanent magnet reciprocates only within a predetermined angle range corresponding to the energization direction of one stator coil as described in Patent Document 1. It is a control type motor. First, as shown in FIG. 2, the rotor 4 of this embodiment has a cylindrical shape and is magnetized to have two poles in the radial direction (the boundary of the magnetic poles is indicated by a one-dot chain line in FIG. 1). The permanent magnet 4a and the central shaft portion 4b integrally formed with a synthetic resin material therein constitute a cylindrical portion of the present invention. Further, the two projecting portions 4c and 4d formed to project in a ring shape over the entire circumference of the outer peripheral surface of the cylindrical portion, and the output pin 4e provided at a lower position in the radial direction of the cylindrical portion are It is molded by the outsert process using a synthetic resin material at the same time as the central shaft part 4b through the disk parts formed on both end faces.

  On the other hand, the stator includes a first stator frame 5, a second stator member 6, a yoke 7, and a coil 8. Among them, the first stator member 5 is made of synthetic resin, and in FIG. 2, the cylindrical upper end is closed with a wall 5a and the lower end is opened. Two positioning pins 5b and 5c (the positioning pin 5c is shown in FIG. 1) are provided. A substantially central region of the inner surface of the wall 5 a is a thrust receiving surface of the rotor 4. In the present embodiment, the inner surface of the wall 5a is formed in the same plane, and the upper end surface of the rotor 4 has a shape in which only the central region protrudes slightly. A slightly protruding shape may be used, and in such a case, the end face of the rotor 4 may be the same plane.

  The second stator member 6 is also made of synthetic resin, and is a long member having a substantially flat plate shape as a whole as compared with the first stator member 5, and is fitted to the positioning pins 5 b and 5 c of the first stator member 5. Long holes 6a and 6b to be combined (the long hole 6b is shown in FIG. 1) and a long hole 6c having substantially the same shape as the long hole 1b of the main plate 1 are provided. Further, a region facing the thrust receiving surface of the first stator member 5 in the state where the open end of the first stator member 5 is closed is used as the other thrust receiving surface of the rotor 4. In the case of this embodiment, the thrust receiving surface is formed in a shape protruding slightly toward the rotor 4 side, and the lower end surface of the rotor 4 is formed as a single plane. 4 may protrude slightly from the central region of the lower end surface, and in such a case, the thrust receiving surface of the second stator member 6 is flush with the surrounding surface. There is no problem.

  As shown in FIG. 3, the yoke 7 has a substantially cylindrical shape. In the case of the present embodiment, the yoke 7 has a substantially rectangular opening 7a in a part thereof, and the first stator. It is fixed (press-fitted) inside the member 4. The inner peripheral surface of the yoke 7 is in contact with the protrusions 4 c and 4 d of the rotor 4 and serves as a radial receiving surface of the rotor 4. Therefore, in the case of the present embodiment, in FIG. 2, the two protruding portions 4 c and 4 d are provided at the upper and lower positions of the cylindrical portion of the rotor 4. It is not limited to a case, It is good also as three or more, for example, you may make it provide only one in the approximate center part of the axial direction of a cylindrical part. In that case, these protrusions may be formed integrally with the central shaft portion 4b or may be formed separately, but in the case of being formed integrally, the amount of protrusion is less than the amount of protrusion of these protrusions. It is necessary to provide a plurality of thin connection runners formed in the protruding amount in the axial direction of the cylindrical part. Further, in the case of the present embodiment, the protrusions 4c and 4d are formed in a series of ring shapes, but the protrusions of the present invention are not limited to such shapes, and a plurality of protrusions are predetermined. However, it may be formed in a ring shape with an interval of.

  Although not shown in FIG. 1 because it is difficult to see the drawing, the opening 7a is formed on the right side of the coil 8 shown in FIG. 1, and the formation position of the edge 7b is from the output pin 4e. Is also on the lower side and near the right side of the coil 8, and the edge 7 c is formed on the upper side of the output pin 4 e and near the right side of the coil 8. Therefore, the angle range in which the opening 7a is formed (that is, the angle formed by two straight lines connecting the central axis of the yoke 7 to the two edges 7b and 7c parallel to the axis in FIG. 3). Is formed so as to be larger than the rotation angle range of the rotor 4, as can be seen by comparing the position of the output pin 4e shown in FIG. 1 with the position of the output pin 4e shown in FIG. Has been.

  Thus, in the case of a present Example, the hole and shaft part for bearing the rotor 4 are not provided in the two stator members 5 and 6 like the past. Therefore, the rotor 4 is also not provided with a shaft portion or a hole that fits rotatably in the hole or the shaft portion. Further, the yoke 7 is not fitted on the outer side of the first stator member 5 as in the prior art, but is fitted on the inner side, and the inner peripheral surface thereof serves as a radial receiving surface of the rotor 4. Therefore, in the conventional configuration, in order to suitably obtain a fitting state between the shaft and the hole having a very small diameter at two fitting portions, it is necessary to tighten the processing accuracy of the parts. In this case, the fitting state between the inner peripheral surface of the yoke 7 having a large diameter and the protrusions 4c and 4d of the rotor 4 may be suitably obtained, which is advantageous in terms of component processing. This also applies to the embodiments described later.

  Therefore, the method of assembling the motor in the present embodiment will be described. The method of assembling is exactly the same in the embodiments described later. First, the yoke 7 is fitted inside the first stator member 5. Next, the rotor 4 is inserted therein. At this time, in the case of the conventional configuration, the innermost part of the first stator member 5 is located on the bearing portion that cannot be visually observed at the time of insertion. However, in the present embodiment, it is simply inserted without paying such attention. Thereafter, the second stator member 6 is temporarily fixed to the first stator member 5, but in the case of the conventional configuration, the output pin 4c of the rotor 4 is inserted into the long hole 6c of the second stator member 6. In the state where the bearing portion provided in the second stator member 6 and the rotor 4 are aligned, the long holes 6a and 6b are formed in the positioning pins 5b and 5c of the first stator member 5, respectively. In the present embodiment, the long holes 6a and 6b can be fitted to the positioning pins 5b and 5c without worrying about the bearing of the rotor 4. it can.

  In this way, after the elongated holes 6a and 6b of the second stator member 6 are fitted to the positioning pins 5b and 5c of the first stator member 5, the two thrust receiving surfaces are surrounded so as to surround them. The coil 8 is wound in a groove formed outside the stator members 5 and 6. At this time, in the case of the conventional configuration, if the relative positional relationship between the two stator members 5 and 6 slightly deviates from the predetermined positional relationship, the relative positional relationship between these bearing portions also deviates. Since the rotor 4 cannot be suitably rotated, the relative positions of the two stator members 5 and 6 are not shifted at the time of the temporary fixing, and the predetermined relative positional relationship is not shifted when the coil 8 is wound. However, in this embodiment, the coil 8 can be wound without paying particular attention to the relative positional relationship between the two stator members 5 and 6. it can.

  The motor of the present embodiment is configured as a unit in this way, but when such a motor is attached to the main plate 1, the output pin 4 e of the rotor 4 is inserted into the long hole 1 b of the main plate 1. The holes and the notches provided in the second stator member 6 are fitted into the positioning pins 1c and 1d of the main plate 1 and then fixed by the two screws 9 and 10. The child member 6 is screwed to the main plate 1. In the blade chamber, the output pin 4e is fitted in both the long holes of the shutter blades 2 and 3. In the case of the present embodiment, the second stator member 6 is screwed to the main plate 1, but the second stator member 6 mainly only blocks the open end of the first stator member 5. In FIG. 2, projecting portions may be provided on the left and right sides of the lower end edge of the first stator member 6, and these projecting portions may be screwed to the base plate 1. Further, both the first stator member 5 and the second stator member 6 may be screwed together.

  Next, the operation of the shutter device of this embodiment will be described. FIG. 1 shows a shooting preparation state in which the camera is already turned on. Therefore, the opening 1a is fully open, and the subject image can be observed with the liquid crystal finder. At this time, the coil 8 of the motor is not energized, but as can be seen from the boundary line of the magnetic poles indicated by the one-dot chain line on the rotor 4, the edge 7c of the opening 7a formed in the yoke 7 and the rotor Since the attractive force acting between the edge 7b of the opening 7a and the permanent magnet 4a is larger than the attractive force acting between the permanent magnet 4a and the permanent magnet 4a, the rotor 4 rotates counterclockwise. The power to do is given. Therefore, although the shutter blades 2 and 3 receive force in the opening operation direction by the output pin 4e, the shutter blade 3 contacts the stopper pin 1g, and this fully opened state is maintained.

  In this state, when a release button (switch) is pressed, the charge accumulated in the solid-state image sensor is released, and a new charge is accumulated to start photographing. Then, when a predetermined control time elapses, a positive current is supplied to the coil 8, and the rotor 4 rotates clockwise. Therefore, the shutter pin 2 is rotated counterclockwise by the output pin 4e, and the shutter blade 3 is rotated clockwise to close the opening 1a. Thereafter, when the shutter blades 2 and 3 completely close the opening 1a, immediately after that, the shutter blade 3 comes into contact with the stopper pin 1h, and the rotation of the rotor 4 and the shutter blades 2 and 3 is stopped. FIG. 4 shows this state. In this state, the coil 8 may continue to be energized, but this state is maintained even if the energization is cut off. That is, at this time, the attractive force acting between the edge 7c and the permanent magnet 4a is larger than the attractive force acting between the edge 7b of the opening 7a of the yoke 7 and the permanent magnet 4a. This is because the child 4 is given a clockwise rotation force and presses the shutter blade 3 against the stopper pin 1h.

  In this way, when the closing operation of the shutter blades 2 and 3 is completed, the imaging information accumulated by the imaging is transferred to the storage device via the image processing system. Is supplied with a reverse current. Thereby, the rotor 4 is rotated counterclockwise, and one shutter blade 2 is rotated clockwise by the output pin 4a, and the other shutter blade 3 is rotated counterclockwise. Therefore, the shutter blades 2 and 3 open the opening 1a. When the shutter blades 2 and 3 fully open the opening 1a, immediately after that, the shutter blade 3 comes into contact with the stopper pin 1g and the rotation of the rotor 4 and the shutter blades 2 and 3 is stopped. Thereafter, when the power supply to the coil 8 is turned off, the state shown in FIG. 1 is restored.

  In the case of this embodiment, the yoke 7 has a substantially square shape so that the shutter blades 2 and 3 can maintain the state shown in FIGS. 1 and 4 even when the coil 8 is not energized. Although the opening 7a is formed, the shape of the yoke 7 in FIG. 3 may be a shape obtained by excising the upper portion of the opening 7a, or a shape obtained by excising the lower portion. Even if both shapes are cut away, it is possible to obtain the same effect as in the present embodiment. Further, when it is desired that the yoke 7 has the same action without providing such an opening 7a and a cut-out portion, a magnetic member is disposed facing the end surface of the cylindrical portion of the rotor 4. You just have to do it. However, like a known diaphragm device, two coils are wound around the two stator members 5 and 6, and currents in opposite directions are supplied simultaneously to the rotor at a position where the opposite rotational forces are balanced. When 4 is stopped, it is not necessary to take measures such as the opening 7a.

  Example 2 will be described with reference to FIG. The shutter device according to the present embodiment is different from the shutter device according to the first embodiment only in the configuration of the rotor 4. Therefore, description of the specific configuration and operation method as the shutter device is omitted, and the description of the first embodiment is incorporated. FIG. 5 is a cross-sectional view shown in the same manner as FIG. 2 described above, and substantially the same members and parts as those in the first embodiment are denoted by the same reference numerals. Therefore, the description of the stator having the same configuration as that of the first embodiment is omitted, and the description of the first embodiment is also applied to the present embodiment. Further, in this embodiment, the method of assembling the motor is exactly the same as that in the first embodiment. Therefore, what was explained in Example 1 in this regard is also incorporated in this example.

  In the case of Example 1, the protrusions 4c and 4d provided on the rotor 4 were formed of a synthetic resin material, like the central shaft portion 4b and the output pin 4e. On the other hand, in the present embodiment, the central shaft portion 4b and the output pin 4e are formed of a synthetic resin material, but the protruding portions 4f and 4g are formed as a part of the permanent magnet 4a. Therefore, in the case of the present embodiment, it is necessary to increase the voltage of the current supplied to the coil 8 as compared with the case of the first embodiment. Therefore, even with such a configuration, the intended purpose can be achieved. In this embodiment, two ring-shaped protrusions are provided. However, as described in the description of the first embodiment, three or more may be provided, or only one may be provided. It may be. And even if it does so, in the case of a present Example, it is not necessary to provide a runner part. The same applies to the following embodiments.

  Example 3 will be described with reference to FIG. Also in the shutter device of the present embodiment, the configuration of the rotor 4 is different from that of the shutter device of the first embodiment. Therefore, description of the specific configuration and operation method as the shutter device is omitted, and the description of the first embodiment is incorporated. 6 is a cross-sectional view similar to FIG. 2 described above, and the same reference numerals are given to substantially the same members and parts as those in the first embodiment. Therefore, the description of the stator having the same configuration as that of the first embodiment is omitted, and the description of the first embodiment is also applied to the present embodiment. Furthermore, also in the case of the present embodiment, the way of assembling the motor is the same as that of the first embodiment. Therefore, what was explained in Example 1 in this regard is also incorporated in this example.

  In the case of Example 1, the protrusions 4c and 4d provided on the rotor 4 were formed of a synthetic resin material, like the central shaft portion 4b and the output pin 4e. On the other hand, in the case of the present embodiment, such a shape portion corresponding to the central shaft portion 4b is formed of a permanent magnet together with the output pin 4e, and only the protruding portions 4h and 4i are the same as those of the first embodiment. Similarly to the case, the permanent magnet 4a is integrally molded with a synthetic resin material. In this case, substantially the same performance can be obtained even if the protrusions 4h and 4i are made of a non-magnetic metal material. It is well known that the output pin 4e is also formed of a permanent magnet as in this embodiment.

  Example 4 will be described with reference to FIG. Also in the shutter device of the present embodiment, the configuration of the rotor 4 is different from that of the shutter device of the first embodiment. For this reason, the description of the first embodiment is used for the specific configuration and operation method of the shutter device. FIG. 7 is a cross-sectional view similar to FIG. 2 described above, and the same reference numerals are given to substantially the same members and parts as those in the first embodiment. Therefore, as for the stator having the same configuration as in the case of the first embodiment, what has been described in the first embodiment is also incorporated in this embodiment. Furthermore, also in the case of the present embodiment, the method of assembling the motor is the same as in the case of the first embodiment, and therefore the description of the first embodiment is incorporated.

  In the case of Example 1, the protrusions 4c and 4d provided on the rotor 4 were formed of a synthetic resin material, like the central shaft portion 4b and the output pin 4e. On the other hand, in the case of the present embodiment, as in the case of the above-described third embodiment, the shape portion corresponding to the central shaft portion 4b and the output pin 4e are formed of permanent magnets. In addition, like the protrusions 4f and 4g of the second embodiment, the protrusions 4j and 4k of the present embodiment are also formed as a part of the permanent magnet 4a. Therefore, in the case of the present embodiment, it is possible to obtain substantially the same performance as in the case of the third embodiment.

  In each of the above embodiments, the output pin 4e of the rotor 4 is directly connected to the shutter blades 2 and 3. However, the present invention is not limited to such a configuration and is indirectly connected. It may be configured as such. In that case, a member called an opening / closing lever or the like is mediated, and the output pin 4e is connected so that the opening / closing lever can be reciprocally rotated, and the pin provided on the opening / closing lever is connected to the shutter blade 2, It becomes the structure made to connect with 3 long holes. In addition, each of the above embodiments has a configuration of a shutter device that is generally referred to as a lens shutter. However, the present invention can also be used as a blade driving device for a focal plane shutter. Therefore, in the case of a focal plane shutter having two shutter blades, two motors are prepared.

  Further, the shutter device in each of the above embodiments has two shutter blades that reciprocally rotate in opposite directions at the same time, but the present invention is not limited to such a configuration, As is well known, the rotor is provided with two output pins, and can be configured as a shutter device or a diaphragm device in which two blades are operated linearly in opposite directions. It can also be configured as a shutter device, a diaphragm device, and a filter device in which the blades are reciprocally rotated. Further, when configured as a diaphragm device or a filter device, a single blade member having a small diaphragm opening or having a filter plate can be configured to reciprocate linearly. It is.

It is a top view of Example 1 applied to the shutter apparatus, Comprising: The shutter blade fully opened state is shown. It is sectional drawing which showed the principal part of FIG. FIG. 3 is a perspective view of the yoke shown in FIGS. 1 and 2. It is a top view of Example 1, Comprising: The closed state of a shutter blade | wing is shown. FIG. 3 is a cross-sectional view showing the main parts of Example 2 in the same manner as in FIG. It is sectional drawing which showed the principal part of Example 3 similarly to FIG. It is sectional drawing which showed the principal part of Example 4 similarly to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plane 1a, 7a Opening part 1b, 6a, 6b, 6c Long hole 1c, 1d, 5b, 5c Positioning pin 1e, 1f Shaft 1g, 1h Stopper pin 2, 3 Shutter blade 4 Rotor 4a Permanent magnet 4b Center shaft 4c , 4d, 4f, 4g, 4h, 4i, 4j, 4k Protruding part 4e Output pin 5 First stator member 5a Wall 6 Second stator member 7 Yoke 7b, 7c Edge 8 Coil 9, 10 Screw

Claims (6)

  At least one blade member attached so as to be reciprocally movable with respect to the main plate, and a cylindrical first fixing having a closed wall having a thrust receiving surface at one end in the axial direction and having the other end as an open portion A slave member has a thrust receiving surface in a region that closes the open portion and faces the thrust receiving surface of the first stator frame, and at least one of the first stator frame is in contact with the base plate A second stator frame attached, a substantially cylindrical yoke attached to an inner peripheral surface of the first stator member, and an outer side of the two stator frames so as to surround the two thrust receiving surfaces. At least one coil wound around, a cylindrical part having a permanent magnet magnetized in the radial direction, and at least one output pin provided integrally with the cylindrical part. Part of both end faces of direction The two thrust receiving surfaces are in contact with each other, and at least one projecting portion provided in a ring shape on a part of the circumferential surface is provided in contact with the inner circumferential surface of the yoke, and the output And a rotor extending to the outside of the two stators and connected to the blade member.   2. The yoke according to claim 1, wherein the yoke has a substantially rectangular opening or a cut-out part in which at least one of the axial directions is opened over a predetermined angle range equal to or larger than the rotation angle of the rotor. Camera blade drive device.   3. The camera blade driving device according to claim 1, wherein the protrusion is formed in a ring shape by a plurality of protrusions arranged at a predetermined interval. 4.   4. The camera blade driving device according to claim 1, wherein at least one of the protrusions is formed on a circumferential surface in the vicinity of both axial ends of the cylindrical portion. 5.   5. The camera according to claim 1, wherein the rotor includes a central shaft portion of the cylindrical portion, the protruding portion, and the output pin made of a synthetic resin material. Blade drive device.   The camera blade driving device according to claim 1, wherein all of the rotors are manufactured as permanent magnets.