JP2008136260A - Electromagnetic actuator, and blade drive unit for camera using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic actuator, in which a bobbin for making one leg of a substantially U-shaped yoke penetrate the bobbin, is arranged at a frame member having a rotor between a bottom board and the member, and which can position the yoke at the bottom board by making the relative position of the yoke and the frame member not displaced at assembling, and to provide a blade drive unit for a camera that uses the electromagnetic actuator. <P>SOLUTION: The synthetic resin made frame member 5, having the rotor 4 between the bottom board 1 and the frame member has the cylindrical bobbin 5c wound with a coil 6, and a protrusion 5f which is spherical at its tip. The substantially U-shaped yoke 7 has a guide groove 7e and a hole 7d at a base 7a. When the leg 7c of the yoke 7 is inserted into the bobbin 5c, the protrusion 5f is pressed against the groove 7e, the frame member 5 is thereby deformed; and when the hole 7d is made to oppose the protrusion 5f, the frame member is restored to original shape and attached to the yoke 7. After that, a positioning shaft 1k of the bottom board 1 is fitted into the hole 7d, and the frame member 5 is attached to the bottom board 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  According to the present invention, a coil is wound around one leg of a substantially U-shaped yoke so that a magnetic pole formed at the tip of both legs faces the peripheral surface of a rotor having a permanent magnet. And a camera blade drive device in which at least one blade is reciprocated using the electromagnetic actuator.

  In Patent Document 1 below, a rotor having a permanent magnet (a rotor in Patent Document 1; a name used in Patent Document 1 in parentheses below) is attached to the ground plane (base) and the ground plane. The two yokes (upper yoke and lower yoke), which are rotatably arranged between the frame member (bobbin and presser member) and are substantially U-shaped, each have one leg (linear portion). ) Is inserted into the cylindrical bobbin part (bobbin) provided on the frame member (bobbin and presser member) and wound with the coil (coil), and inserted into the ends of both legs (straight line part, curved part). An electromagnetic actuator is described in which the formed magnetic pole portions (first magnetic pole portion and second magnetic pole portion) are opposed to the circumferential surface of the rotor (rotor). The yokes (upper yoke and lower yoke) are positioned by fitting holes (positioning holes) to shafts (pins) provided on the base plate (base).

  The following Patent Document 2 describes an electromagnetic actuator having a configuration in which a frame member (bobbin and pressing member) in the electromagnetic actuator described in Patent Document 1 is separated into a plate-shaped pressing plate and a bobbin. Has been. Therefore, the electromagnetic actuator described in Patent Document 1 has a smaller number of parts, so that it can be said that the configuration is more advantageous than the electromagnetic actuator described in Patent Document 2 if only that point is observed. Moreover, although the electromagnetic actuator of patent document 1 has piled up two yokes (upper yoke, lower yoke), each leg part (straight part) is inserted in the bobbin part (bobbin), The electromagnetic actuator described in Patent Document 2 is configured such that only one yoke is required. Accordingly, if only the yoke point is viewed, the number of parts is reduced by one, and therefore the electromagnetic actuator described in Patent Document 2 can be said to be more advantageous than the electromagnetic actuator described in Patent Document 1.

  At the present stage, an optimal patent document cannot be presented. However, in the configuration of the electromagnetic actuator described in Patent Document 1, one yoke is used as in the electromagnetic actuator described in Patent Document 2. An electromagnetic actuator (hereinafter referred to as a conventional electromagnetic actuator) is also known. The present invention relates to an electromagnetic actuator having such a configuration and a blade driving device for a camera using the electromagnetic actuator.

JP 2004-32873 A JP 2006-101649 A

  When assembling the conventional electromagnetic actuator as described above, first, the rotor is rotatably attached to the shaft standing on the main plate, and then one leg of the yoke is attached to the bobbin of the frame member. The hole is formed in the yoke, the hole formed in the yoke is fitted to the shaft provided in the base plate, positioning is performed, and finally the frame member is attached to the base plate. However, when the hole of the yoke is fitted to the shaft of the main plate, the relative position of the frame member and the yoke is shifted so that one leg portion of the yoke is easily removed from the bobbin portion. The yoke is a member smaller than the frame member, and when the hole is fitted to the shaft of the main plate, it is hidden by the frame member and is difficult for the operator to see. For this reason, the operator performs assembly work while paying close attention so that the relative positional relationship between the yoke and the frame member does not shift, and the assembly work time is significantly increased, which is extremely disadvantageous in terms of cost. There was a problem. Further, since the relative position between the frame member and the yoke is easily shifted, there is a problem that automation by the assembly robot is extremely difficult.

  The present invention has been made to solve such problems, and the object of the present invention is to provide a bobbin on a frame member that is attached to the main plate and has a rotor disposed between the main plate and the main plate. An electromagnetic actuator having a structure in which one leg of a substantially U-shaped yoke is inserted into the bobbin, and one leg is inserted into the bobbin in advance during assembly. A small electromagnetic actuator that is advantageous in terms of cost, and can be positioned with respect to the base plate without shifting the relative positional relationship with the frame member, and a blade for a camera using the same It is to provide a driving device.

  In order to achieve the above object, an electromagnetic actuator according to the present invention includes a ground plate having a positioning portion, a bobbin portion having a cylindrical shape and wound with a coil, and a protruding portion protruding toward the ground plate side. A frame member attached in parallel to the base plate, and a rotor having a permanent magnet and rotatably attached to at least one of them between the base plate and the frame member And a base portion and two leg portions projecting in substantially the same direction from the base portion, and the base portion has a positioned portion that is positioned while being in contact with the positioning portion. The leg portions of the two leg portions are inserted into the bobbin portion, the tip portions of the two leg portions are used as magnetic pole portions and are opposed to the circumferential surface of the rotor, and after the one leg portion is inserted into the bobbin portion, The positioning part engages with the protrusion and a predetermined force A yoke and is adapted not come from the bobbin portion not applied, so that has a. In that case, when the one leg portion is inserted into the bobbin portion, the base portion of the yoke has a shallow groove that slides and guides the tip end of the protruding portion from the rotor side to the positioned portion. If it is formed, the leg portion can be preferably inserted into the bobbin portion.

  Further, the frame member is formed with a hole in place of the projection at the position where the projection is provided, and the positioning portion of the yoke is only on the surface on the ground plane side. A projection that engages with the hole provided in place of the projection is provided on the surface of the frame member at the position where the positioned portion is provided. In this case, when the one leg portion of the yoke is inserted into the bobbin portion on the yoke-side surface, the tip of the protruding portion of the yoke is slidably contacted to the hole. If the shallow groove to be guided is formed, the leg portion can be suitably inserted into the bobbin portion.

  Further, in the electromagnetic actuator according to the present invention, the positioning portion is a shaft portion standing on the base plate, and the positioned portion is a notch portion formed by cutting into a creek shape of the base portion. Alternatively, the positioning portion may be a shaft portion erected on the base plate, and the positioned portion may be a hole for fitting the shaft portion. Furthermore, if the tip end surface of the protrusion is formed as a spherical surface or a circular arc surface, the leg portion can be smoothly inserted into the bobbin portion.

  Further, the ground plate having an opening for photographing, at least one blade attached to the ground plate so as to reciprocate to move back and forth, and the blade are reciprocated. If the drive source is the electromagnetic actuator described in any of the above, various camera blade drive devices having a reduced thickness in the direction along the optical axis can be obtained. It is done. In that case, the rotor has an output pin that integrally reciprocates within a predetermined angle range, and the blades can be reciprocated by the output pin. It will be very advantageous. Further, unlike such a configuration, the base plate having the photographing opening and the two positioning portions, and attached to the base plate so as to be able to reciprocate in order to advance and retract to the opening. At least one blade, two frame members having two bobbin portions and two protrusions, two yokes, and a drive source for reciprocating the blades. The two yokes may be arranged with the rotor interposed therebetween, and the drive source may be any one of the electromagnetic actuators described above. In that case, the rotor has an output gear, and if the blade is indirectly reciprocated by the output gear, the plurality of blades are simultaneously rotated in the same direction. Thus, an aperture device for a camera in which the aperture diameter is changed can be obtained.

  According to the present invention, a cylindrical bobbin portion is provided on a frame member that is attached to a base plate and a rotor is disposed between the base plate and one leg of a yoke that is substantially U-shaped on the bobbin portion. In the electromagnetic actuator having the configuration in which the portion is inserted, when one leg portion of the yoke is inserted into the bobbin portion, the projection provided on one of the frame member and the yoke engages with the other, and the frame member Since the relative positional relationship between the yoke and the yoke does not deviate, it becomes easy to align the positioning portion of the yoke with the positioning portion provided on the base plate during assembly, which is extremely advantageous in terms of cost. In addition, this makes it easy to automate assembly.

  The embodiment of the present invention will be described with reference to two examples. In each embodiment, the present invention is configured as a camera shutter device. However, the case where the present invention is configured as a single electromagnetic actuator or the configuration of a camera blade driving device other than the shutter device will be described as appropriate. I will decide. 1 to 4 are for explaining the first embodiment, and FIGS. 5 to 8 are for explaining the second embodiment.

  This embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a plan view of the camera shutter device as seen from the subject side, and FIG. 2 shows the overlapping relationship of the members shown in FIG. It is sectional drawing shown clearly. 3 is a plan view showing only the frame member and the yoke of the electromagnetic actuator in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line AA in FIG. This embodiment is configured as a shutter device for a digital camera to be incorporated in an information terminal device including a mobile phone. For this reason, each component is actually a very small member that is difficult to handle in production, but is enlarged in each drawing.

  First, the configuration of this embodiment will be described. The ground plane 1 is made of a synthetic resin and has a substantially rectangular planar shape. However, as can be seen from FIG. 2, both sides have a complicated shape. As shown in FIG. 1, the base plate 1 is formed with a circular opening 1a for the photographing optical path, and a circular arc is formed at a slightly lower position in the left direction. A long hole 1b is formed. Further, the cover plate 2 having an outer shape slightly smaller than the base plate 1 and constituting the blade chamber between the base plate 1 and the opening 1a is slightly larger in diameter than the opening 1a at the position facing the opening 1a. A portion 2a is formed, and a long hole 2b (see FIG. 2) having substantially the same shape is formed at a position facing the long hole 1b.

  In addition to the blade shaft 1c and the two stopper shafts 1d and 1e, a plurality of mounting shafts 1f are erected on the surface of the base plate 1 on the blade chamber side. Among them, the tip of the blade shaft 1c is inserted into the hole 2b formed in the cover plate 2 as shown in FIG. 2, and the tips of the stopper shafts 1d and 1e are shown in FIG. As shown, the holes 2c and 2d formed in the cover plate 2 are inserted. Further, only two of the plurality of mounting shafts 1f are shown in FIG. 2, but they have a cylindrical shape before assembling, and are attached to the holes of the cover plate 2 at the time of assembling. And the cover plate 2 is attached by deforming the tip into a bowl shape by hot melting. In the blade chamber configured as such, the shutter blade 3 having the long hole 3a is rotatably attached to the blade shaft 1c. In FIG. 1, the shutter blade 3 in a state where the opening 1a is closed is indicated by a two-dot chain line.

  The base plate 1 is provided with a rotor shaft 1g, two mounting shafts 1h and 1i, a hook portion 1j, and a positioning shaft 1k on the surface opposite to the blade chamber, and the configuration of the electromagnetic actuator. Members are attached to them. As described in Patent Documents 1 and 2, the electromagnetic actuator of this embodiment includes a rotor having a permanent magnet, a substantially U-shaped yoke in which a bobbin around which a coil is wound is fitted on one leg. Is a current control type motor that rotates the rotor only in a predetermined angular range in a direction corresponding to the energization direction of the coil.

  First, the rotor 4 of this embodiment has a cylindrical permanent magnet main body 4a magnetized in two radial directions, and is rotatably attached to the rotor shaft 1g. However, in FIG. 1, the boundary of the magnetic pole is indicated by a one-dot chain line. The synthetic resin arm 4b that is integrated with the main body 4a and projects in the radial direction is provided with an output pin 4c at the tip thereof. The output pin 4 c is inserted into the blade chamber from the long hole 1 b of the base plate 1 and is fitted into the long hole 3 a of the shutter blade 3, and its tip is inserted into the long hole 2 b of the cover plate 2. Yes. In addition, although the main-body part 4a of a present Example is formed in the cylindrical shape, it forms in a substantially column shape and the center of the both end surfaces of the axial direction is supported by the base plate 1 and the frame member 5 mentioned later. You may make it. As is well known, the entire rotor 4 may be made of permanent magnets. Further, in FIG. 1, the arm 4b and the output pin 4c when the shutter blade 3 closes the opening 1a are indicated by a two-dot chain line.

  The frame member 5 of the present embodiment is made of synthetic resin and has holes 5a and 5b for inserting the mounting shafts 1h and 1i, and a cylindrical bobbin portion 5c is interposed between them. Is forming. A coil 6 is wound around the bobbin portion 5c. Further, on both sides of the bobbin portion 5c, two terminal pins 5d and 5e are erected toward the subject side, and both ends of the coil 6 are attached. Further, the frame member 5 is provided with a protrusion 5f having a spherical tip surface and a circular recess 5g for receiving a part of the main body 4a of the rotor 4 on the surface of the base plate 1 side. Inside the recess 5g, a ring-shaped sliding contact portion 5h is formed which is in sliding contact with the end surface of the main body portion 4a on the subject side. Although not shown, normally, a flexible printed wiring board is attached to the surface of the frame member 5 on the subject side.

  The yoke 7 of the present embodiment has a substantially U-shape with a base portion 7a and two leg portions 7b and 7c extending long in the same direction from the base portion 7a. In addition to the hole 7d formed in the base portion 7a, a straight shallow groove 7e is formed on the surface on the frame member 5 side from the rotor 4 side to the hole 7d. The cross-sectional shape is a concave shape composed of three straight sides. The positioning shaft 1k is fitted into the hole 7d from the base plate 1 side, and the protrusion 5f is engaged with the edge of the hole 7d from the frame member 5 side. Further, the two leg portions 7b and 7c have one leg portion 7c penetrated into the hollow portion of the bobbin portion 5c, and both ends thereof are opposed to the peripheral surface of the main body portion 4a with a magnetic pole portion. As can be seen from FIG. 2, these magnetic pole portions are opposed to the peripheral surface of the main body portion 4a at a position slightly above the middle of the main body portion 4a in the axial direction. Are lifted to the frame member 5 side by the magnetic force of the permanent magnets acting between the magnetic pole portions and the magnetic pole portions, and the upper end surfaces thereof are always brought into contact with the sliding contact portions 5h.

  Such a frame member 5 and the yoke 7 are attached to the main plate 1 as follows. First, the leg portion 7 c of the yoke 7 is inserted into the hollow portion of the frame member 5 and pushed in. At this time, it is pushed smoothly at first, but when the base portion 7a reaches the protruding portion 5f of the frame member 5, the height of the protruding portion 5f of the frame member 5 is higher than the depth of the groove 7e of the yoke 7. Since the direction is slightly higher, resistance to insertion occurs. Therefore, when the yoke 7 is pushed with a stronger force than before, the yoke 7 slightly deforms the frame member 5 by the action of the spherical surface of the projection 5f, and then the groove 7e is the highest of the projection 5f. However, it comes to be slid and touched. Then, as the hole 7d of the yoke 7 faces the protrusion 5f of the frame member 5, the frame member 5 returns to its original shape and puts the tip of the protrusion 5f into the hole 7d. 3 and 4 show the state in which the frame member 5 and the yoke 7 are attached to each other as described above. In the case of the present embodiment, the tip surface of the protrusion 5f is formed into a spherical surface, but an arc surface whose cross-sectional shape is substantially the same as the protrusion 5f shown in FIG. You may form in. Further, in the present embodiment, the hole 7d as the positioned portion is formed in a circular shape, but it may be a hole having another shape such as a square.

  After the frame member 5 and the yoke 7 are attached to each other in this way, the assembly is attached to the base plate 1. At that stage, the mounting shafts 1h and 1i of the base plate 1 are still long cylindrical. Yes. Therefore, first, the holes 5a and 5b of the frame member 5 and the mounting shafts 1h and 1i of the base plate 1 are aligned, and the frame member 5 is moved to the base plate 1 side to fit them together. However, when performing such alignment, and when moving to the main plate 1 side after that, the yoke 7 is in contact with the edge of the hollow portion of the bobbin portion 5c so that the base of the leg portion 7c is in contact with the hole. Since the edge of 7d is in contact with the spherical surface of the protrusion 5f, the relative positional relationship with the frame member 5 hardly changes. Therefore, in the next stage where the hole 7d of the yoke 7 and the positioning shaft 1k of the base plate 1 are fitted together, even if the relative positional relationship between them cannot be observed accurately, the two can be reliably fitted. Then, after fitting the hole 7d and the positioning shaft 1k, finally, the tips of the mounting shafts 1h, 1i of the columnar base plate 1 are thermally melted and deformed into a bowl shape, as shown in FIG. The attachment state shown in FIG. 2 is obtained.

  Next, the operation of this embodiment will be described. FIG. 1 shows a photographing standby state, where the shutter blade 3 and the output pin 4c of the rotor 4 are in a state indicated by broken lines, and the opening 1a is fully opened. At this time, the coil 6 is not energized. However, as is well known, at this time, the rotor 4 rotates in the clockwise direction by the magnetic attractive force acting by the opposing arrangement relationship between the magnetic poles of the permanent magnet main body 4a and the two magnetic poles of the yoke 7. The shutter blade 3 is rotated counterclockwise by the output pin 4c, but this state is maintained because the shutter blade 3 is in contact with the stopper shaft 1d. Therefore, in this state, the photographer can observe the subject image via a liquid crystal display device or the like.

  When the release button is pressed at the time of shooting, the charge that has been accumulated in the solid-state image sensor is released, and accumulation of charges for shooting is started. When a predetermined time elapses, a forward current is supplied to the coil 6 by a signal from the exposure time control circuit. Therefore, the rotor 4 is rotated counterclockwise, and the shutter blade 3 is rotated clockwise by the output pin 4c. Thereby, the shutter blade 3 performs a closing operation, and immediately stops the contact with the stopper shaft 1e immediately after the opening 1a is completely closed. In FIG. 1, the positions of the shutter blade 3 and the output pin 4c at this time are indicated by a two-dot chain line.

  In this way, when the opening 1a is in the closed state, the imaging information is transferred to the image storage device. When the transfer is completed, a current in the reverse direction is supplied to the coil 6 this time. Therefore, the rotor 4 is rotated clockwise, and the shutter blade 3 is rotated counterclockwise by the output pin 4c. As a result, the shutter blade 3 opens the opening 1a, stops immediately after being fully opened, and comes into contact with the stopper shaft 1d. Then, immediately after that, the state in which the power supply to the coil 6 is cut off is the above-described photographing standby state.

  The present embodiment is configured as a shutter device in which one shutter blade is reciprocally rotated. However, as described in Patent Documents 1 and 2, the present invention has two shutters. It can also be configured as a shutter device in which the blades are simultaneously reciprocated in opposite directions. Further, the shutter device configured as described above and the shutter device according to the present embodiment can be employed as a lens barrier device with almost the same configuration. In the present invention, the shutter blade 3 of the present embodiment can be formed as a diaphragm device by forming a circular opening smaller than the opening 1a. A filter device can be obtained by attaching an ND filter plate to the formed opening. Further, two or more of such a shutter device, a diaphragm device, and a filter device may be configured as one unit. In such a configuration, an electromagnetic wave as in this embodiment is formed on a common ground plane. Two or more actuators are provided. These can also be said in the case of Example 2 below.

  Next, Example 2 will be described with reference to FIGS. 5 to 8. FIG. 5 is a plan view of the camera shutter device as viewed from the subject side, and FIG. 6 is a diagram of the members shown in FIG. It is sectional drawing which showed the overlapping relationship clearly. 7 is a plan view showing only the frame member and the yoke of the electromagnetic actuator in FIG. 5, and FIG. 8 is a cross-sectional view taken along the line BB in FIG. The configuration of this embodiment is different only in the shape of a part of the frame member 5 described in the first embodiment and the shape of a part of the yoke 7. Therefore, the description of the configuration of the present embodiment will be made only for the different parts, the same members and the same parts as those of the first embodiment will be given the same reference numerals as those in FIGS. 1 to 4 and the description thereof will be omitted. To do.

  The frame member 5 of the present embodiment is formed with the protruding portion 5i where the protruding portion 5f is formed in the first embodiment, but the other shapes are the same as those in the first embodiment. And the protrusion part 5i is formed as an inclined surface where the front end surface is flat and the bobbin part 5c side is the highest. Further, the yoke 7 of the present embodiment is formed with a notch portion 7f having a shape cut into a cove shape from the edge of the base portion 7a where the hole 7d is formed in the first embodiment. Other shapes are the same as those in the first embodiment.

  Such a frame member 5 and the yoke 7 are relatively attached as follows. The leg portion 7c of the yoke 7 is inserted into the hollow portion of the frame member 5 and pushed in. At this time, it is pushed smoothly at first, but when the base portion 7a reaches the protruding portion 5i of the frame member 7, a feeling of resistance is generated in the insertion. Therefore, when the yoke 7 is pushed with a stronger force than before, the yoke 7 gradually deforms the frame member 5 by the action of the inclined surface of the projection 5i, and the highest portion of the inclined surface becomes the level of the groove 7e. After that, the groove 7e is slid in contact with the highest portion of the protruding portion 5i and is pushed. When the edge of the notch 7f of the yoke 7 exceeds the highest position of the protrusion 5i of the frame member 5, the frame member 5 instantaneously returns to its original shape and drops the protrusion 5i into the notch 7f. . 7 and 8 show a state in which the frame member 5 and the yoke 7 are attached to each other as described above.

  After that, the assembly of the frame member 5 and the yoke 7 is attached to the main plate 1. Since the attachment method is exactly the same as in the first embodiment, the description thereof is omitted. Further, since the shutter device of this embodiment is operated in the same manner as in the case of Embodiment 1, the description thereof is also omitted. In the present embodiment, the positioned portion of the yoke 7 is formed as the notch 7f, but it may be a circular hole or a square hole. However, as can be seen by comparing FIG. 1 and FIG. 5 described above, the overall length of the yoke 7 can be shortened by using the notch 7f as in this embodiment. Furthermore, the shape of the notch 7f in this embodiment may be left as it is, and the shape of the protrusion 5i may be the shape of the protrusion 5f in the first embodiment. By doing so, the frame member 5 and the yoke 7 can be easily recombined when an assembly failure occurs or during repair.

  In each of the above embodiments, the groove 7e is formed in the yoke 7. However, if this groove 7e is formed, the frame member 5 and the yoke 7 are assembled to each other. Is easier, but not always necessary. Moreover, in each said Example, although the positioning part of this invention provided in the ground plane 1 is standingly arranged as the cylindrical positioning shaft 1k, the shape is not limited to a cylindrical shape. In particular, in the case of the yoke 7 having the shape of the second embodiment, the notched portion is not erected as a shaft portion, but protrudes from the side wall of the thick portion on which the frame member 5 is placed to the yoke 7 side. You may form in the peninsula shape which entered into 7f from the open part side. Further, in each of the above embodiments, the hole 7d and the notch 7f provided in the yoke 7 are all formed from the surface on the ground plane 1 side to the surface on the frame member 5 side. In the invention, they are formed only on the surface on the ground plate 1 side, and on the surface on the side of the frame member 5 corresponding to the formation position thereof, a projecting portion that is convex toward the frame member 5 is provided, and the frame member 5 may be provided with a hole with which the protrusion engages. In that case, it is preferable to form a groove corresponding to the groove 7e in each of the above embodiments from the end of the frame member 5 to the hole position.

  In each of the above embodiments, the present invention is configured as a shutter device among camera blade driving devices. In the above description, the configuration example in the case of using another camera drive device such as a diaphragm device has also been described. However, it is also an embodiment of the present invention that is configured as a single electromagnetic actuator by making the planar shape of the main plate close to the planar shape of the frame member. Furthermore, the electromagnetic actuator in each of the above embodiments is configured such that the frame member is provided with only one bobbin portion and only one yoke, but the present invention is limited to such a configuration. Not. For example, as in the electromagnetic actuator used in the camera diaphragm device described in JP-A-9-230420 and JP-A-2001-201780, the rotor permanent magnet has four poles, and the output pin Can be configured as an electromagnetic actuator in which two yokes are arranged with a rotor in between, and in that case, two bobbin portions and two protrusions can be formed. What is necessary is just to provide the frame member which has a part. Further, although the shape of the yoke is different, an electromagnetic actuator having four permanent magnets of the rotor and two yokes interposed between the rotors, the output pin being integrated with the rotor. There is also known an electromagnetic actuator provided in the above, but the present invention can also be configured as such an electromagnetic actuator.

It is the top view of Example 1 which looked at the shutter device for cameras from the to-be-photographed object side. It is sectional drawing which showed the overlapping relationship of the member shown by FIG. 1 clearly. It is the top view which showed only the frame member and yoke of the electromagnetic actuator in FIG. It is sectional drawing cut | disconnected by the AA line | wire of FIG. 3, and seeing in the arrow direction. It is the top view of Example 2 which looked at the shutter apparatus for cameras from the to-be-photographed object side. FIG. 6 is a cross-sectional view illustrating the overlapping relationship of the members illustrated in FIG. 5 in an easily understandable manner. It is the top view which showed only the frame member and yoke of the electromagnetic actuator in FIG. FIG. 8 is a cross-sectional view taken along line BB in FIG. 7 and viewed in the direction of the arrow.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plate 1a, 2a Opening part 1b, 2b, 3a Long hole 1c Blade shaft 1d, 1e Stopper shaft 1f, 1h, 1i Mounting shaft 1g Rotor shaft 1j Hook part 1k Positioning shaft 2 Cover plate 2b, 2c, 2d, 5a, 5b, 7d hole 3 shutter blade 4 rotor 4a main body 4b arm 4c output pin 5 frame member 5c bobbin 5d, 5e terminal pin 5f, 5i protrusion 5g depression 5h sliding portion 6 coil 7 yoke 7a base 7b, 7c leg 7e Groove 7f Notch

Claims (11)

  It has a ground plate having a positioning portion, a bobbin portion that is cylindrical and wound with a coil, and a protruding portion that protrudes toward the ground plate, and is attached in parallel to the ground plate. A frame member, a rotor having permanent magnets and rotatably attached to at least one of the base plate and the frame member, and a base and two legs projecting from the base in substantially the same direction The base part has a positioned part that is positioned and is in contact with the positioning part, and the two leg parts are inserted into the bobbin part. After the one leg portion is inserted into the bobbin portion, the positioned portion engages with the projection portion and applies a predetermined force. Otherwise, the yoke cannot be removed from the bobbin portion. , An electromagnetic actuator, characterized in that it comprises a.   The base of the yoke is formed with a shallow groove that slides and guides the tip of the protruding portion from the rotor side to the positioned portion when the one leg portion is inserted into the bobbin portion. The electromagnetic actuator according to claim 1.   The frame member is provided with a hole in place of the projection at the position where the projection is provided, and the positioning portion is provided only on the surface on the ground plane side of the yoke. In addition, a projection that engages with the hole provided in place of the projection is provided on the surface on the frame member side at the position where the positioned portion is provided. The electromagnetic actuator according to claim 1.   The frame member has a shallow groove on the yoke-side surface that guides the tip of the projection of the yoke by sliding contact with the bobbin when the one leg of the yoke is inserted into the bobbin. The electromagnetic actuator according to claim 3, wherein the electromagnetic actuator is formed.   5. The positioning part according to claim 1, wherein the positioning part is a shaft part erected on the base plate, and the positioning part is a notch part formed by cutting into a cove shape of the base part. The electromagnetic actuator in any one.   5. The electromagnetic wave according to claim 1, wherein the positioning portion is a shaft portion erected on the base plate, and the positioned portion is a hole for fitting the shaft portion. Actuator.   The electromagnetic actuator according to any one of claims 1 to 6, wherein a tip end surface of the protrusion is formed as a spherical surface or an arc surface.   The ground plate having an opening for photographing, at least one blade attached to the ground plate so as to reciprocate to move back and forth in the opening, and a drive source for reciprocating the blade A camera blade drive device, wherein the drive source is the electromagnetic actuator according to any one of claims 1 to 7.   The camera blade according to claim 8, wherein the rotor has an output pin that reciprocally rotates integrally within a predetermined angle range, and the blade is reciprocated by the output pin. Drive device.   The base plate having the photographing opening and the two positioning portions; at least one blade attached to the base plate so as to reciprocate in order to advance and retract to the opening; and two The frame member having the bobbin portion and the two protrusions, the two yokes, and a drive source for reciprocating the blades, the two yokes interposing the rotor. The camera blade drive device according to claim 1, wherein the drive source is the electromagnetic actuator according to claim 1.   The camera blade driving device according to claim 10, wherein the rotor has an output gear, and the blade is indirectly reciprocated by the output gear.

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