JP2008033119A - Blade driving device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade driving device for cameras constituted in such a manner that the collision of two blades within a blade chamber can be prevented by providing a belt-like member extremely simple in mounting work. <P>SOLUTION: The two shutter blades 7, 8 which are simultaneously rotated back and forth in mutually opposite directions by driving pins 4c with respect to blade shafts 1g, 1h erected on a main base plate 1 are rotatably mounted. Also, the rectilinear belt-like member 9, which is disposed between two sheets of blades 7 and 8, is mounted with the holes formed at its both ends movably in their axial direction with respect to the two mounting shafts 1n, 1p erected on the main base plate 1. Consequently, the blade driving device for cameras which obviates the collision of the two shutter blades 7, 8 during the actuation can be realized at a low cost. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a camera blade drive device in which a plurality of shutter blades and light amount control blades (aperture blades, filter blades) are arranged in one blade chamber.

  In the shutter device described in Patent Document 1 below, two shutter blades are reciprocally rotated in opposite directions simultaneously by the driving means, and in the case of an opening operation, the shutter device starts to open from the center of the exposure aperture, In the case of the closing operation, the exposure opening is closed last in the center. When two shutter blades perform such an operation, it is ideal that each shutter blade operates on a plane perpendicular to the optical axis when performing the closing operation. The tip of the two may collide with each other by tilting or bending. Therefore, even when the tips are lengthened and the exposure opening is fully open, It is trying to overlap. However, with such a configuration, each shutter blade becomes large, so that the shutter blades do not collide with each other without lengthening the tip of the shutter blade. Patent Document 2 listed below discloses a shutter device in which two blade chambers are configured by partitioning with an intermediate plate, and two shutter blades are operated in separate blade chambers.

  Then, as described in Patent Document 2, when two blade chambers are configured by partitioning between two ground plates with an intermediate plate, the two shutter blades are operated in separate blade chambers. The shutter chamber and the light amount control device (aperture device, filter device) can be configured as a single unit, and the shutter blade and the light amount control blade (aperture blade or filter blade) can be provided in different blade chambers. By disposing the blades in operation, the blades do not collide during operation, and when the two light quantity control devices are configured as one unit, the blades are disposed in different blade chambers. The light quantity control blades (the diaphragm blades, the diaphragm blades and the filter blades, and the filter blades) do not collide during operation. In this way, the present invention provides a shutter device having two shutter blades that rotate in opposite directions and open the exposure opening from the central portion and finally close the central portion. The present invention relates to a blade driving device in which the apparatus is configured as one unit and a blade driving device in which two light quantity control devices are configured as one unit.

JP 2003-177447 A JP 2005-99167 A

  As described in Patent Document 2, when two blade chambers are configured by partitioning two ground plates with an intermediate plate, collision between the blades is completely prevented. However, such a configuration has a problem that it is not preferable in terms of cost because the intermediate plate is a considerably large member. Also, in order to suitably fix the intermediate plate between the two ground plates, it is necessary to devise the shape of the outer periphery of the two ground plates and the intermediate plate, and the mounting configuration becomes complicated. There is a problem that it is not preferable in terms of processing and cost. On the other hand, a configuration has been proposed in which a plurality of blades arranged in one blade chamber do not collide without providing an intermediate plate. However, in such a case, for example, in the case of a shutter device including two shutter blades that are reciprocally operated in opposite directions at the same time, the shape of the blades is changed to the center of the exposure opening in the case of opening operation. In the case of a closing operation that begins to open from the portion, it becomes difficult to obtain a desired blade shape, such as being unable to make the shape that can be closed at the center of the exposure opening last.

  The present invention has been made in order to solve such problems, and the object of the present invention is to provide a small member without using a large member like a conventional intermediate plate and to perform an extremely large installation work. It is an object of the present invention to provide a camera blade driving device that is advantageous in terms of cost and can prevent collision of two blades by providing a simple belt-like member.

  In order to achieve the above object, a camera blade driving device of the present invention includes a main ground plate having an opening for a subject optical path, and an opening for the subject optical path. Attached to the auxiliary ground plate constituting one blade chamber and the first blade mounting shaft erected on the blade chamber side surface of the main ground plate, and reciprocally rotates to advance and retract to the opening. A first blade to be moved and a second blade mounting shaft that is erected on the blade chamber side surface of the main base plate, and is arranged on the auxiliary base plate side relative to the first blade, and reciprocally rotates. The second blade that is advanced and retracted by the opening by means of the above and the holes provided at both ends are fitted to the two mounting shafts erected on the blade chamber side surface of the main base plate so as to be movable in the axial direction thereof. And are arranged between the first blade and the second blade. So that includes a belt-shaped member.

  In that case, one of the two mounting shafts into which the holes of the belt-shaped member are fitted is either the first blade mounting shaft or the second blade mounting shaft, The two mounting shafts into which the holes are fitted are the first blade mounting shaft and the second blade mounting shaft, and the belt-shaped member is formed in an arc shape surrounding the opening. The mounting shaft is also used, which is advantageous in terms of cost.

  Further, the first blade and the second blade may be shutter blades that are simultaneously rotated in opposite directions by the same driving means, and, of the first blade and the second blade, One may be a shutter blade that is reciprocally rotated by the first drive means, and the other may be a light amount control blade that is reciprocally rotated by the second drive means.

  In the present invention, in order to prevent the collision of two blades, the member disposed between them is a belt-like member, and the attachment to the main base plate is performed by attaching holes provided at both ends to the two attachment shafts. Therefore, it is not only a small member compared to the conventional intermediate plate, but also the mounting operation is simple and extremely effective in terms of cost.

  Embodiments of the present invention will be described with reference to four illustrated examples. 1 to 3 are for explaining the first embodiment, FIGS. 4 and 5 are for explaining the second embodiment, and FIGS. 6 and 7 are for explaining the third embodiment. FIG. 8 and FIG. 9 are for explaining the fourth embodiment.

  In this embodiment, two shutter blades that are reciprocated simultaneously in opposite directions by the same driving means start to open from the center of the exposure opening when performing the opening operation, and when the closing operation is performed, the exposure opening. It is a shutter apparatus comprised so that the center part may be closed last. The shutter device of this type can be used for a camera using a silver salt film and a digital camera including a camera for various information terminal devices. The operation of this embodiment is applied to a digital camera. The case where it is adopted will be described. 1 is a plan view showing a photographing standby state, FIG. 2 is a plan view showing a photographing end state, and FIG. 3 is a cross-sectional view for explaining the overlapping relationship of members constituting the apparatus. is there.

  First, the configuration of the present embodiment will be described mainly with reference to FIGS. 1 and 3. The main ground plate 1 of the present embodiment is made of synthetic resin, has a relatively thick and complicated shape as can be seen from FIG. 3, and has a circular shape at its substantially central portion as shown in FIG. A subject optical path opening 1a is formed. An auxiliary ground plate 2 is attached to the main ground plate 1 at a predetermined interval, and a single blade chamber is formed between the two. Although this auxiliary ground plane 2 is shown only in FIG. 3 and omitted in FIGS. 1 and 2, the planar shape is substantially the same as that of the main ground plane 1, and a circular shape is formed at the substantially central portion thereof. An opening for the subject optical path is formed. However, since the diameter of the opening 1a is smaller than that of the opening, the exposure opening in this embodiment is restricted by the opening 1a. The auxiliary ground plate 2 is attached to the main ground plate 1 at a plurality of locations by a method called heat caulking. This attachment method is well known, but in the case of the present embodiment, as shown in FIG. 3, a two-stage shape integrally formed with the main base plate 1 is shown as one of them. After inserting the tip of the shaft 1b into a hole provided in the auxiliary base plate 2, it is melted by heat and deformed into a flange shape.

  As shown in FIG. 3, three shafts 1c, 1d, and 1e are erected on the surface outside the blade chamber of the main base plate 1 by integral molding. The synthetic resin-made stator frame 3 is attached by the above-described thermal caulking, and an actuator chamber is formed between the main base plate 1 and the stator frame 3. The electromagnetic actuator of the present embodiment does not show all the constituent members in detail, but has almost the same configuration as the electromagnetic actuator disclosed in JP-A-2006-72174.

  That is, the rotor 4 of this embodiment includes a cylindrical permanent magnet 4a magnetized in two radial directions, a synthetic resin arm portion 4b integrated with the permanent magnet, and an arm portion 4b. The drive pin 4c formed at the tip of the shaft 1c is rotatably attached to the shaft 1c. The drive pin 4c is inserted into the blade chamber from a well-known slot 1f (only the cross-sectional shape is shown in FIG. 3) formed in an arc shape in the main base plate 1, and the tip thereof is connected to the auxiliary base plate 2 It is inserted into the long hole 2a having the same shape. In the present embodiment, the arm portion 4b and the drive pin 4c are made of synthetic resin, but it is also known that they are made of permanent magnets.

  Next, the configuration of the stator will be described. The stator frame 3 is formed with a hollow bobbin portion 3a and two terminal pins 3b and 3c by integral molding. A coil 5 is wound around the bobbin portion 3a, and both ends thereof are wound around the terminal pins 3b and 3c. Then, both ends thereof are soldered to a flexible printed wiring board (not shown) attached to the stator frame 3. Further, the yoke 6 of the present embodiment is not shown in a planar shape, but is substantially U-shaped like the yoke described in the above Japanese Patent Laid-Open No. 2006-72174, and has two leg portions. One is inserted into the hollow portion of the bobbin portion 3a. And this yoke 6 makes the front-end | tip part of two legs a magnetic pole part, and is made to oppose a surrounding surface so that said rotor 4 may be pinched | interposed. In the case of this embodiment, the bobbin portion 3a is formed integrally with the stator frame 3, but this type of electromagnetic actuator is also known in which they are configured as separate members.

  As shown in FIG. 1, two blade shafts 1g, 1h, four stopper shafts 1i, 1j, 1k, 1m, two mounting shafts 1n, 1p is standingly formed by integral molding, and those front-end | tips are inserted in each hole formed in the auxiliary | assistant ground plane 2. FIG. In addition, two shutter blades 7 and 8 and a belt-like member 9 are arranged in the blade chamber. Among them, the shutter blade 7 disposed on the main base plate 1 side has a long hole 7a, is rotatably attached to the blade shaft 1g, and is disposed on the auxiliary base plate 2 side. The shutter blade 8 has a long hole 8a and is rotatably attached to the blade shaft 1h. The drive pins 4c of the rotor 4 are fitted in the long holes 7a, 8a of the shutter blades 7, 8. Further, the belt-like member 9 disposed between the shutter blades 7 and 8 has a straight shape, and the holes formed at both ends of the belt-like member 9 are arranged with respect to the mounting shafts 1n and 1p. It is fitted so that it can move in the direction. The electromagnetic actuator is attached to the surface of the main base plate 1 outside the blade chamber so as to substantially overlap the shutter blade 8 in FIG.

  Next, the operation of this embodiment will be described. FIG. 1 shows a photographing standby state, and the shutter blades 7 and 8 have the opening 1a fully opened. 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. At this time, the coil 5 of the electromagnetic actuator is not energized. However, as is well known, at this time, the rotor 4 is urged to rotate counterclockwise by the opposing arrangement relationship between the magnetic poles of the permanent magnet 4a and the two magnetic pole portions of the yoke 6. Thus, the drive pin 4c is given a force that moves substantially downward in FIG. 1 and rotates the shutter blades 7 and 8 in opposite directions. However, since the shutter blades 7 and 8 are in contact with the stopper shafts 1i and 1j and are prevented from rotating, this state is maintained.

  When the release button is pressed at the time of shooting, the charge accumulated in the solid-state image sensor is released, shooting is started, and new charge is 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. Therefore, the rotor 4 is rotated clockwise and the driving pin 4c is moved substantially upward in FIG. 1, so that the shutter blade 7 is rotated clockwise and the shutter blade 8 is rotated counterclockwise. Is done. As a result, the two shutter blades 7 and 8 close the opening 1a. In the present embodiment, the belt-like member 9 is interposed between the tip portions of the two shutter blades 7 and 8. Therefore, the tips do not collide with each other during the closing operation. Thereafter, when the shutter blades 7 and 8 completely cover the central portion of the opening 1a, immediately after that, the shutter blade 7 abuts against the stopper shaft 1k, and the shutter blade 8 abuts against the stopper shaft 1m. Is stopped. FIG. 2 shows the stop state.

  In this manner, when the state shown in FIG. 2 is reached, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. When the transfer is completed, a current in the opposite direction is supplied to the coil 5 unlike the above, so that the rotor 4 is rotated counterclockwise, and the drive pin 4c is moved substantially downward in FIG. I will move to. Therefore, the shutter blades 7 and 8 are rotated in opposite directions to open the opening 1a from the substantially central portion. When the shutter blades 7 and 8 fully open the opening 1a, immediately after that, the shutter blade 7 contacts the stopper shaft 1i, and the shutter blade 8 contacts the stopper shaft 1j, thereby rotating the rotor 4. Be stopped. Thereafter, when the power supply to the coil 5 is cut off, the state shown in FIG. 1 is restored. The operation of the present embodiment has been described in the case where it is adopted in a digital camera. However, when it is adopted in a silver salt film camera, the state shown in FIG. Thus, photographing is performed by opening and closing the shutter blades 7 and 8.

  Thus, according to the present embodiment, as described in Patent Document 2, it is not necessary to fix the intermediate plate between the main ground plate 1 and the auxiliary ground plate 2, so that the two ground plates 1 and 2 are mutually connected. The mounting structure is simple, and the assembling work is simple because only the holes provided at both ends of the belt-like member 9 are fitted to the mounting shafts 1n and 1p. Moreover, in the case of the intermediate plate, it is a large member, and holes for passing through the blade shafts 1g, 1h, the stopper shafts 1i, 1j, 1k, 1m, and the drive pin 4c must be formed at predetermined positions. However, the belt-like member 9 of the present embodiment only forms two holes. Therefore, the configuration of the present embodiment is extremely advantageous in terms of cost compared to the case where an intermediate plate is provided. This also applies to the embodiments described below.

  Next, the second embodiment shown in FIGS. 4 and 5 will be described. FIG. 4 is a plan view of the photographing standby state shown in the same manner as FIG. 1, and FIG. It is a top view of the imaging | photography completion state shown similarly to FIG. And since the structure of a present Example only differs in the shape of the strip | belt-shaped member 9 in said Example 1, and its attachment method, about another structural member and those parts, it is FIG.1 and FIG.2. The reference numerals used in FIG. Also in this embodiment, the two shutter blades 7 and 8 are simultaneously rotated in opposite directions by the electromagnetic actuator having the same configuration as in the first embodiment. The operation is substantially the same as in the first embodiment. Therefore, the description of the operation of this embodiment is also omitted.

  The belt-like member 11 of the present embodiment has an arc shape that surrounds most of the opening 1 a and is disposed between the shutter blades 7 and 8. Further, the main base plate 1 is not provided with the mounting shafts 1n and 1p provided in the first embodiment. Therefore, the belt-like member 11 of the present embodiment has holes provided at both ends thereof fitted to the blade shafts 1g and 1h. Even with this configuration, the shutter blades 7 and 8 can be opened and closed without hindrance. Further, with this configuration, the belt-like member 11 is larger as a part than the belt-like member 9 of the first embodiment, but it is not necessary to provide two dedicated mounting shafts on the main ground plate 1, so that As a whole, the cost is reduced as compared with the case of 1. In the case of this embodiment, the two attachment shafts of the belt-like member 11 are shared by the two blade shafts 1g and 1h. However, only one of the attachment shafts is shared, and the other attachment shaft is shown in FIG. The mounting shaft 1n shown in FIG. 1 or the mounting shaft 1p may be used.

  Next, the third embodiment shown in FIGS. 6 and 7 will be described. FIG. 6 is a plan view of the photographing standby state shown in the same manner as FIG. 1, and FIG. 7 is the same as FIG. It is a top view of the photography end state shown in FIG. In this embodiment, one shutter blade that is reciprocally rotated by the first driving means, and one sheet that has an opening (aperture opening) smaller than the exposure opening and is reciprocally rotated by the second driving means. The diaphragm blade is configured as a blade driving device for a digital camera arranged in one blade chamber. The first driving means and the second driving means in the present embodiment are electromagnetic actuators having the configuration described in the first embodiment. Therefore, description of the specific configuration of these electromagnetic actuators is omitted.

  First, the configuration of this embodiment will be described. The main base plate 21 of the present embodiment is made of a synthetic resin, and has a circular subject optical path opening 21a at a substantially central portion thereof. Moreover, although not shown in figure in this main ground plate 21, the auxiliary ground plate of the shape similar to the auxiliary ground plate 2 in Example 1 is attached at predetermined intervals similarly to the auxiliary ground plate 2, One blade chamber is formed between the two. Also, in this auxiliary base plate, a circular opening for the subject optical path is formed in the substantially central portion, but also in this embodiment, the opening portion 21a of the main base plate 21 regulates the exposure opening. is doing.

  Two blade shafts 21b, 21c, four stopper shafts 21d, 21e, 21f, 21g, and one mounting shaft 21h are erected on the surface of the main base plate 21 on the blade chamber side by integral molding, These tips are inserted into the respective holes formed in the auxiliary base plate as in the case of the first embodiment. In the blade chamber, one shutter blade 22, one diaphragm blade 23, and a belt-like member 24 are arranged. Among them, the shutter blade 22 disposed on the main base plate 1 side has a long hole 22a, is rotatably attached to the blade shaft 21b, and is disposed on the auxiliary base plate side. The diaphragm blade 23 has a long hole 23a and a diaphragm opening 23b, and is rotatably attached to the blade shaft 21c. Further, the belt-like member 24 disposed between the shutter blade 22 and the aperture blade 23 has a linear shape, and the holes formed at both ends thereof are formed with respect to the blade shaft 21c and the mounting shaft 21h. These are fitted so as to be movable in the axial direction.

  As described above, the first driving means for reciprocating the shutter blades 22 and the second driving means for reciprocatingly rotating the aperture blades 23 are both electromagnetic actuators described in the first embodiment. The first electromagnetic actuator that drives the shutter blade 22 is attached to the surface outside the blade chamber of the main base plate 21 so as to substantially overlap the shutter blade 22 in FIG. The long hole (not shown) formed in the main base plate 21 is inserted into the long hole 22a of the shutter blade 22 in the blade chamber. Therefore, in FIG. 6, when the rotor rotates in the clockwise direction, the drive pin 25 moves substantially to the upper left. Further, the second electromagnetic actuator for driving the diaphragm blade 23 is located on the right side of the opening 21a in FIG. 6 so as to overlap a part of the diaphragm blade 23 and a part of the shutter blade 22 outside the blade chamber of the main base plate 21. The drive pin 26 attached to the surface and integral with the rotor passes through a long hole (not shown) formed in the main base plate 21 and is inserted into the long hole 23a of the diaphragm blade 23 in the blade chamber. . Therefore, in FIG. 1, when the rotor rotates counterclockwise, the drive pin 26 moves substantially to the lower left.

  Next, the operation of this embodiment will be described. FIG. 6 shows a photographing standby state, and the shutter blade 22 fully opens the opening 21a. Further, the aperture blade 23 has not entered the opening 21a and is in a retracted state. 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. At this time, the coil of each electromagnetic actuator is not energized. However, at this time, the rotor of the first electromagnetic actuator is biased to rotate counterclockwise by the opposing arrangement relationship between the permanent magnet and the magnetic pole portion of the yoke, and the rotor of the second electromagnetic actuator. Is biased to rotate clockwise for the same reason. Therefore, the drive pin 25 attempts to rotate the shutter blade 22 clockwise, and the drive pin 26 attempts to rotate the diaphragm blade 23 clockwise. However, the shutter blade 22 contacts the stopper shaft 21d, and the diaphragm blade 23 stops the stopper. This state is maintained in contact with the shaft 21f.

  When the release button is pressed at the time of shooting, in the initial stage, the subject light is first measured by the photometry circuit. Actual photographing is started after entering the opening 1a. First, a case where it is determined that photographing is performed without restricting subject light will be described. In that case, the charge accumulated in the solid-state image sensor is immediately released, imaging 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 of the first electromagnetic actuator by a signal from the exposure time control circuit. As a result, the rotor is rotated clockwise, so that the shutter blade 22 is rotated counterclockwise by the drive pin 25 and closes the opening 21a. At this time, the shutter blade 22 and the aperture blade 23 are closed. Since the belt-like member 24 is interposed therebetween, the tip of the shutter blade 22 does not collide with the diaphragm blade 23. Then, when the opening 21a is completely closed, immediately after that, the shutter blade 22 abuts against the stopper shaft 21e, whereby the rotation of the rotor is stopped.

  In this way, when the closing operation of the shutter blade 22 is stopped, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. When the transfer ends, a current in the opposite direction is supplied to the coil of the first electromagnetic actuator, unlike the above. Therefore, the rotor is rotated counterclockwise, and the shutter blade 22 is rotated clockwise by the drive pin 25, so that the shutter blade 22 opens the opening 21a. Does not collide with the aperture blade 23. Then, the shutter blade 22 is brought into contact with the stopper shaft 21d and stopped immediately after the exposure opening 21a is fully opened. Thereafter, when the current to the coil of the first electromagnetic actuator is cut off, the state returns to the state shown in FIG.

  Next, a case will be described in which when the release button is pressed during shooting, it is determined by the measurement result of the photometry circuit that shooting is performed with subject light limited. As described above, in the state of FIG. 6, the rotor of the second electromagnetic actuator is stopped at the extreme position of clockwise rotation. In this case, first, a current in the reverse direction is supplied to the coil of the second electromagnetic actuator. As a result, the rotor is rotated counterclockwise, and the diaphragm blade 23 enters the opening 21a to rotate the diaphragm blade 23 counterclockwise by the drive pin 26. Since the belt-like member 24 is interposed between the shutter blade 22 and the shutter blade 22, the diaphragm blade 23 does not collide with the shutter blade 22 during the operation. When the center of the aperture 23b reaches the center of the aperture 21a, the aperture blade 23 comes into contact with the stopper shaft 21g and stops.

  Immediately after entering this state, the charge accumulated in the solid-state image sensor is released, imaging 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 of the first electromagnetic actuator by a signal from the exposure time control circuit. As a result, the rotor is rotated clockwise, and the shutter blade 22 is rotated counterclockwise by the drive pin 25 to close the opening 21a. Then, when the opening 21a is completely closed, immediately after that, the shutter blade 22 abuts against the stopper shaft 21e, whereby the rotation of the rotor is stopped. The stop state is the state shown in FIG.

  In the state of FIG. 7, when the charge accumulated in the solid-state image sensor is transferred to the storage device as imaging information, a current in the reverse direction is supplied to the coil of the first electromagnetic actuator. The shutter blade 22 is rotated in the clockwise direction by the drive pin 25. Therefore, the shutter blade 22 opens the opening 21a. On the other hand, since a forward current is supplied to the coil of the second electromagnetic actuator, the rotor is rotated clockwise and the diaphragm blade 23 is rotated clockwise by the drive pin 26. Therefore, the aperture blade 23 moves away from the opening 21a. The shutter blade 22 is stopped by contacting the stopper shaft 21d immediately after the opening 21a is fully opened, and the diaphragm blade 23 is contacted by the stopper shaft 21f immediately after retreating completely from the opening 21a. Is stopped. Thereafter, when the energization of the coils of both electromagnetic actuators is cut off, the state shown in FIG. 6 is restored.

  As described above, the belt-like member 24 of the present embodiment is linear like the belt-like member 9 of the first embodiment, but in the case of the first embodiment, in order to attach the belt-like member 9, two dedicated members are used. In the present embodiment, only the mounting shaft 21h is used as the dedicated mounting shaft, and the other mounting shaft is the blade shaft 21c of the diaphragm blade 23. I also use it. For this reason, the configuration of this embodiment is advantageous in terms of cost compared to the case where two dedicated mounting shafts are provided for mounting the belt-shaped member 24. In addition, if the belt-like member 24 is not formed in a straight line but is formed in an arc shape surrounding the opening 21a, the attachment shaft at one end thereof can be shared by the blade shaft 21b.

  This embodiment is a blade driving device in which the shutter blade 22 and the diaphragm blade 23 are arranged in one blade chamber. However, the diaphragm blade 23 of this embodiment covers the diaphragm opening 23b. It is known that if an ND filter sheet is attached, it becomes a filter blade which is one of the same light quantity control blades. Therefore, the blade driving device of the present invention can be configured as a blade driving device in which shutter blades and filter blades are arranged in the blade chamber. Further, by replacing the shutter blades of the present embodiment with filter blades, it can be configured as a blade driving device in which the diaphragm blades and the filter blades are arranged. Further, by replacing the shutter blades of the present embodiment with the diaphragm blades, it can be configured as a blade driving device in which two diaphragm blades having different aperture openings 23b are arranged. Furthermore, the shutter blades and the diaphragm blades of the present embodiment can be configured as a blade driving device in which two filter blades are arranged by using filter blades to which filter sheets having different concentrations are attached. When configured as a blade driving device in which two light quantity control blades are arranged in the blade chamber, it is possible to employ not only a digital camera but also a camera using a silver salt film. These are also true for Example 4 below.

  Next, the fourth embodiment shown in FIGS. 8 and 9 will be described. FIG. 8 is a plan view of the photographing standby state shown in the same manner as FIG. 6, and FIG. It is a top view of the imaging | photography completion state shown similarly to FIG. And since the structure of a present Example only differs in the shape of the strip | belt-shaped member 24 in said Example 3, and its attachment method, about other structural members and those site | parts, FIG.6 and FIG.7. The reference numerals used in FIG. Also in this embodiment, the shutter blades 22 and the diaphragm blades 23 are rotated in the same manner by the actuator having the same configuration as in the third embodiment. Is also omitted.

  The belt-like member 31 of this embodiment has an arc shape that surrounds about half of the opening 21 a and is disposed between the shutter blade 22 and the aperture blade 23. Further, the main base plate 21 is not provided with the mounting shaft 21h provided in the third embodiment. Therefore, the belt-like member 31 of the present embodiment has holes provided at both ends thereof fitted to the blade shafts 21b and 21c. Even with this configuration, the shutter blade 22 and the diaphragm blade 23 can be individually reciprocated without colliding with each other. Further, with this configuration, the band-shaped member 31 is larger as a component than the band-shaped member 24 of the third embodiment, but it is not necessary to provide two dedicated mounting shafts on the main base plate 21. The cost is reduced as a whole compared to the case of 3.

  In each of the above embodiments, the electromagnetic actuator has been described on the assumption that the electromagnetic actuator has a configuration similar to that described in Japanese Patent Application Laid-Open No. 2006-72174. The means is not limited to this type of electromagnetic actuator, and may be a step motor as long as it can reciprocate the two blades, or mechanical drive means using a spring. It does not matter.

It is a top view of Example 1 which shows a photography standby state. It is a top view of Example 1 which shows a photography end state. 1 is a cross-sectional view of Example 1. FIG. It is a top view of Example 2 which shows a photography standby state. It is a top view of Example 2 which shows a photography end state. It is a top view of Example 3 which shows a photography standby state. It is a top view of Example 3 which shows a photography end state. It is a top view of Example 4 which shows a photography standby state. It is a top view of Example 4 which shows a photography end state.

Explanation of symbols

1,21 Main ground plate 1a, 2a, 21a Opening 1b, 1c, 1d, 1e Shaft 1f, 2a, 7a, 8a, 22a, 23a Long hole 1g, 1h, 21b, 21c Blade shaft 1i, 1j, 1k, 1m, 21d, 21e, 21f, 21g Stopper shaft 1n, 1p, 21h Mounting shaft 2 Auxiliary ground plate 3 Stator frame 3a Bobbin portion 3b, 3c Terminal pin 4 Rotor 4a Permanent magnet 4b Arm portion 4c, 25, 26 Drive pin 5 Coil 6 Yoke 7, 8, 22 Shutter blade 9, 11, 24, 31 Strip member 23 Aperture blade 23b Aperture opening

Claims (5)

  A main ground plate having an opening for a subject optical path; an auxiliary ground plate having an opening for a subject optical path and forming a blade chamber between the main ground plate; and the main ground plate The first blade is attached to a first blade mounting shaft that is erected on the blade chamber side surface of the blade and is moved back and forth by reciprocating rotation. The first blade is erected on the blade chamber side surface of the main base plate. A second blade that is attached to the second blade attachment shaft and that is disposed closer to the auxiliary base plate than the first blade and is reciprocally rotated to advance and retract into the opening, and holes provided at both ends Are fitted between the first blade and the second blade so as to be movable in the axial direction with respect to two mounting shafts erected on the blade chamber side surface of the main base plate. A blade drive device for a camera, comprising: .   2. The one of the two attachment shafts into which the holes of the belt-shaped member are fitted is one of the first blade attachment shaft and the second blade attachment shaft. Camera blade drive device.   The two attachment shafts into which the holes of the belt-like member are fitted are the first blade attachment shaft and the second blade attachment shaft, and the belt-like member has an arc shape surrounding the opening. The camera blade driving device according to claim 1, wherein   4. The camera blade driving device according to claim 1, wherein the first blade and the second blade are shutter blades that are simultaneously rotated in opposite directions by the same driving unit. 5.   One of the first blade and the second blade is a shutter blade that is reciprocally rotated by a first drive means, and the other is a light amount control blade that is reciprocally rotated by a second drive means. The camera blade drive device according to any one of claims 1 to 3.

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