JP2008249814A - Blade driving device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade driving device for a camera, in which even when the distance between two blade attachment shafts is reduced, one of two blades attached to these two blade attachment shafts does not interfere with the other blade attachment shaft, when the two blades are simultaneously rotated in directions opposite to each other, so that the blades can be actuated at high speed. <P>SOLUTION: The two blade attachment shafts 1g and 1h are erected and provided on a shutter base plate 1, wherein one blade attachment shaft 1g is in a circular cylindrical shape, but the other blade attachment shaft 1h comprises a circular-cylindrical-shaped shaft part 1h-1 on the top end side and a deformed shaft part 1h-2 on the root side in such a shape that one part is cut off in a radial direction. A shutter blade 3 is rotatably attached to the blade attachment shaft 1g and a shutter blade 4 is rotatably attached to the circular-cylindrical-shaped shaft part 1h-1 of the blade attachment shaft 1h. The shutter blade 3 is therefore actuated in the formation surface of the deformed shaft part 1h-2, then, does not interfere with the blade attachment shaft 1h even when the shutter blades 3 and 4 are simultaneously rotated in the directions opposite to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blade driving device for a camera in which blades such as shutter blades and diaphragm blades are driven by driving means such as an electromagnetic actuator.

  As one of the shutter devices used in compact cameras and cameras built into information terminal equipment (including mobile phones), two shutter blades are simultaneously reciprocated in opposite directions by driving means such as electromagnetic actuators. What was comprised so that it might make was known, and the example is described in the following patent document 1. FIG. Further, at least one of the shutter blades is composed of two divided blades that can be simultaneously rotated at different speeds in the same direction, and when fully opened, these divided blades are sufficiently overlapped to reduce the accommodation space. It is also known. It is known that any shutter device having such a configuration can be directly employed as a lens barrier device by arranging a blade on the front surface of the photographing lens.

  In addition, two blades that are reciprocally rotated in opposite directions simultaneously by one driving means are provided, and an aperture having a diameter smaller than the exposure aperture is formed in one blade to form a diaphragm blade, and the other blade A diaphragm device is known in which the diaphragm blade can be made smaller by using a light shielding blade, and such a diaphragm device is also described in Patent Document 1. Further, Patent Document 1 discloses a filter device in which an ND filter is attached to such a diaphragm blade so as to cover the opening.

  Among such devices, it is also known from Patent Document 1 that a shutter device, a diaphragm device, and a filter device are configured as one unit. Thus, the present invention relates to a camera blade drive device including two blades that are simultaneously rotated in opposite directions by one drive means. Further, as the deformation device, the present invention relates to a blade driving device for a camera constituted by two divided blades that can simultaneously rotate at least one blade in the same direction at different speeds.

JP 2002-139765 A

  As is well known, the higher the operating speed of the shutter blade, the better. As a result, the exposure time can be shortened and uneven exposure can be reduced. Also in the case of a diaphragm device or a filter device, the higher the operating speed of the blade, the better. Accordingly, the time from the release to the start of shooting exposure is shortened, and an image in a desired state can be easily obtained when shooting a moving subject. Furthermore, even in the case of a barrier device, it is better that the operating speed of the blades is fast, so that it is possible to start photographing (release) quickly.

  By the way, in the case of the camera blade driving device as described above, that is, the camera blade driving device having two blades rotating in opposite directions at the same time, the two blades are erected on the ground plate. It is rotatably attached to each blade attachment shaft, and the drive means connects the two blade attachment shafts with a drive pin fitted between the two blade attachment shafts in the long holes of the blades. It is configured to reciprocate in a direction substantially perpendicular to the line and to cause each blade to reciprocate.

  Therefore, in the blade driving device having such a configuration, in order to increase the operation speed of the blade, the interval between the two blade mounting shafts may be reduced. By doing so, even if the operating speed and the operating angle range of the drive pin are the same, the operating angle of the two blades increases, and the operating speed of each blade increases accordingly. However, recent blade drive devices have been miniaturized as much as possible, so if the distance between the two blade mounting shafts is made too small, the blades attached to one blade mounting shaft will be There is a problem that, during the operation, it collides with the other blade mounting shaft and the predetermined opening / closing operation cannot be performed.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a camera having two blades that are simultaneously rotated in opposite directions by the drive pins of the drive means. In order to increase the operating speed of the blade, the blade driving device for a camera in which one blade does not interfere with the other blade mounting shaft even if the interval between the two blade mounting shafts is reduced. Is to provide.

  In order to achieve the above object, each of the camera blade driving devices of the present invention has an opening for a subject optical path and forms a blade chamber between the two, and the surface on one blade chamber side The two blade mounting shafts are erected with a predetermined interval between them, and each has a long hole and is individually rotatably attached to the two blade mounting shafts. It has two blades and a drive pin fitted in the two long holes, and the drive pin is in a direction substantially orthogonal to a line connecting the shafts between the two blade mounting shafts. Drive means for rotating the two blades in opposite directions by reciprocating, and at least one of the two blade mounting shafts attaches one of the two blades In addition to the cylindrical shaft part that is Parts have a profiled shaft portion of the excised shape, other part of the two blades are to be placed in the space of the cut portion.

  In this case, the ground plate on which the two blade attachment shafts are erected has a third blade attachment shaft adjacent to at least one of the blade attachment shafts and in a region opposite to the other blade attachment shaft. A third blade having a long hole into which the drive pin is fitted is rotatably attached to the third blade mounting shaft, and the third blade is Together with the blades attached to the adjacent blade attachment shafts, the drive pins may be simultaneously reciprocated at different speeds in the same direction.

  According to the present invention, in a camera blade drive device including two blades that are simultaneously rotated in opposite directions by a drive pin of a drive unit, at least one of two blade mounting shafts is mounted on a blade. In addition to the cylindrical shaft part, it has a deformed shaft part with a shape cut out in a radial direction over a predetermined length in the axial direction, and the other blade part is formed as if it was cut out Since it is arranged in the space where it is arranged, the operating speed of the two blades can be increased without changing the operating speed of the drive pin.

  Embodiments of the invention are illustrated by the three illustrated examples. Among them, Example 1 and Example 3 are configured as shutter devices that can be employed in both digital cameras and silver salt film cameras, and Example 2 is a digital camera and silver salt film camera. It is configured as a diaphragm device that can also be employed. 1 to 6 are for explaining the first embodiment, FIGS. 7 to 10 are for explaining the second embodiment, and FIGS. 11 to 15 are for explaining the third embodiment. It is for explanation.

  Example 1 will be described with reference to FIGS. As described above, the present embodiment is configured as a shutter device that can be used for both a digital camera and a silver salt film camera. However, the operation of the present embodiment is applied to a digital camera. I will explain it. FIG. 1 is a plan view showing a fully opened state of the shutter blades before photographing, and FIG. 2 is a plan view showing a closed state of the shutter blades immediately after photographing. 3 and 4 are partial plan views showing in detail the blade chamber in the enclosure A of FIG. 1, and FIG. 3 is a view of the base plate side from the cover plate side, and FIG. It is the figure which looked at the cover board side from the baseplate side, Comprising: The two shutter blades arrange | positioned in a blade chamber are shown by both of them. FIG. 5 is a cross-sectional view taken along the line CC of FIG. 1 and shows the base plate on the upper side and the cover plate on the lower side, but a comparison with FIGS. 3 and 4 is necessary. Therefore, for convenience, the cross-sectional portion is also indicated by the line CC in FIGS. Further, FIG. 6 is a partial plan view showing the blade chamber in the box B in FIG. 2 as seen in FIG.

  First, the configuration of this embodiment will be described. The base plate 1 of the present embodiment is made of a synthetic resin, and as shown in FIGS. 1 and 2, the subject optical path opening 1a having a circular shape around the optical axis is formed. A relatively large hole 1b is formed in the lower right portion of the opening 1a. The cover plate 2 of this embodiment is also made of synthetic resin, and is attached to the base plate 1 by an appropriate means, and constitutes a blade chamber between the base plate 1 and the cover plate 2. The cover plate 2 is shown in FIG. 1 and FIG. 2 with a part thereof omitted, but the outer shape has the same shape as the base plate 1 and overlaps with the opening 1a. An opening 2a for a subject optical path having a slightly larger diameter than 1a is formed. Therefore, in this embodiment, the exposure opening is regulated by the opening 1a.

  As can be seen from FIGS. 1 and 2, four stopper pins 1c, 1d, 1e, and 1f and two blade mounting shafts 1g and 1h are erected on the surface of the main plate 1 on the blade chamber side. Further, as shown in FIG. 1, on the surface of the cover plate 2 on the blade chamber side, three circular recesses 2b, 2c, 2d and one bullet-shaped recess 2e are formed. In addition, the tips of the stopper pins 1c, 1d, 1e, and 1f are inserted into the recessed portions 2b, 2c, 2d, and 2e.

  As shown in FIG. 3, a thick portion 1i is formed on the surface of the base plate 1 on the blade chamber side so as to surround the hole 1b and the blade mounting shafts 1g and 1h. And the end surface of the thick part 1i is divided into two by providing a step, and separately from the reference surface 1i-1 occupying most of the region, the reference surface 1i is located in the vicinity of the blade mounting shaft 1h. It has a high surface 1i-2 that is slightly higher than -1. Further, of the two blade mounting shafts 1g and 1h, one blade mounting shaft 1g has a cylindrical shape as is well known, but the other blade mounting shaft 1h has a tip side as shown in FIG. The cylindrical shaft portion 1h-1 and a root-shaped deformed shaft portion 1h-2 having a shape that is partially cut off in the radial direction. In FIG. 3, since it is the opposite side, it cannot be actually seen. However, in order to understand the cross-sectional shape of the deformed shaft portion 1 h-2, the space portion formed in the cut shape is shown. It is indicated by hatching.

  As can be seen from FIG. 5, in the case of the present embodiment, the wall surface formed by partially cutting the blade mounting shaft 1h in the radial direction is the same surface as the inner wall surface of the hole 1b. However, the inner wall surface of the hole 1b may be formed so as to protrude as indicated by a two-dot chain line. In the present embodiment, the deformed shaft portion 1h-2 is formed at such a position. However, the present invention is limited to forming the deformed shaft portion 1h-2 at such a position. However, depending on the shape specifications of the base plate 1 and the cover plate 2 and the overlapping relationship of shutter blades, which will be described later, as long as it is formed over a predetermined length in the axial direction of the blade mounting shaft 1h, the blade mounting shaft 1h You may form in the intermediate part of a length direction, and may form in a front-end | tip part. This also applies to the following embodiments.

  On the other hand, as shown in FIG. 4, a thick portion 2 f is formed on the surface of the cover plate 2 on the blade chamber side so as to substantially face the thick portion 1 i. The end face of the thick part 2f is also divided into a reference face 2f-1 and a high face 1f-2, and the high face 1f-2 is opposed to the reference face 1i-1 of the thick part 1i. The reference surface 2f-1 is opposed to the high-level surface 1i-2 of the thick portion 1i. Further, the cover plate 2 is formed with an arcuate depression 2g at the substantially central part of the thick part 2f, and two depressions 2h and 2i shallower than the depression 2g are formed on both sides thereof. The tip of the blade attachment shaft 1g is inserted into the recess 2h, and the tip of the blade attachment shaft 1h is inserted into the recess 2i.

  Two shutter blades 3 and 4 are arranged in the blade chamber constituted by the base plate 1 and the cover plate 2. Among them, the shutter blade 3 disposed on the base plate 1 side has a long hole 3a as shown in FIG. 3, and is rotatably mounted on the blade mounting shaft 1g. The shutter blade 4 disposed on the cover plate 2 side has a long hole 4a and is rotatably attached to the cylindrical shaft portion 1h-1 of the blade attachment shaft 1h. As can be seen from FIG. 5, the shutter blade 3 operates between the reference surface 1 i-1 of the base plate 1 and the high level surface 2 f-2 of the cover plate 2, and the shutter blade 4 is the high level surface 1 i of the base plate 1. -2 and the reference surface 2f-1 of the cover plate 2 are operated. Therefore, the shutter blade 3 is restricted from moving in the axial direction of the blade mounting shaft 1g, and a part of the shutter blade 3 operates in a space formed as if a part of the blade mounting shaft 1h is cut off in the radial direction. The shutter blade 4 is restricted from moving in the axial direction of the blade mounting shaft 1h so that it does not come off from the cylindrical shaft portion 1h-1 toward the deformed shaft portion 1h-2.

  As shown in FIG. 5, a rotor mounting shaft 1 j is erected on the surface of the main plate 1 outside the blade chamber. And the permanent magnet rotor 5 is rotatably attached there. The permanent magnet rotor 5 is composed of a cylindrical body portion 5a, an arm portion 5b extending in the radial direction therefrom, and a drive pin 5c formed at the tip thereof. 1 is inserted into the long holes 3a and 4a of the shutter blades 3 and 4 through the large hole 1b formed in the blade chamber 1 and the tip of the circle is formed in the cover plate 2. It is inserted in the arc-shaped depression 2g. In the case of the present invention, since the configuration of the electromagnetic actuator need not be described in detail, the constituent members of the stator are not shown. Further, as this type of permanent magnet rotor, there is also known one in which only the main body portion 5a in the present embodiment is made of a permanent magnet and the arm portion 5b and the drive pin 5c are made of a synthetic resin.

  Next, the operation of this embodiment will be described. FIG. 1 shows a shooting standby state in which the camera is turned on. At this time, since the shutter blades 3 and 4 have the exposure opening (opening 1a) fully opened and the solid-state imaging device (not shown) is exposed to the subject light, the photographer observes the subject image on the monitor. Is possible. At this time, the stator coil (not shown) of the electromagnetic actuator is not energized, but as is well known, the permanent magnet rotor 5 has a force that rotates counterclockwise using its magnetic force. Has been granted. For this reason, the driving pin 5c gives a force that rotates counterclockwise to the shutter blade 3, and a force that rotates clockwise to the shutter blade 4, but the shutter blade 4 has a stopper pin 1f. This fully open state is maintained.

  When the release button is pressed during shooting, the charge accumulated in the solid-state imaging device is released by a signal from the exposure control circuit, and exposure for shooting is started. When a predetermined time elapses, a current is supplied to the stator coil by a signal from the exposure control circuit, so that the permanent magnet rotor 5 is rotated in the clockwise direction, and the shutter blade 3 is moved clockwise by the drive pin 5c. And the shutter blade 4 is rotated counterclockwise to close the opening 1a. The operating speed of the shutter blades 3 and 4 at this time becomes faster as the distance between the blade mounting shafts 1g and 1h and the drive pin 5c is shorter. However, if it is too short, the shutter blade interferes with the blade mounting shaft of the other shutter blade. Therefore, in the case of the present embodiment, a deformed shaft portion 1h-2 is formed on the blade mounting shaft 1h so that the shutter blade 3 can operate without interference. Therefore, the opening 1a is closed at a faster speed than usual. Needless to say, if the deformed shaft portion is formed also on the blade mounting shaft 1g, the closing operation can be made faster. Therefore, the present invention may be configured as such. This is the same in the embodiments described below.

  When the opening 1a is closed in this manner, immediately after that, the shutter blade 3 comes into contact with the stopper pin 1e, and the shutter blade 4 comes into contact with the stopper pin 1c, whereby the rotation of the permanent magnet rotor 5 is stopped. . FIG. 2 shows the stop state, and FIG. 6 shows the blade chamber in the enclosure B of FIG. 2 as seen from the cover plate 2 side as seen in FIG. It is. Thus, in the case of the present embodiment, from the fully open state to the closed state, a part of the shutter blade 3 always operates in a space formed as if a part of the blade attachment shaft 1h is cut off. It is like that. In the case of the present embodiment, it is configured as described above, but the shape of the shutter blade 3 may be operated in the above space only for one period during operation. The same applies to each of the embodiments.

  In the state shown in FIG. 2, the imaging information is transferred from the solid-state imaging device to the storage device. When the transfer ends, a current in the reverse direction is supplied to the stator coil in the opposite direction. Therefore, the permanent magnet rotor 5 is rotated counterclockwise, the shutter pin 3 is rotated counterclockwise by the drive pin 5c, and the shutter blade 4 is rotated clockwise to open the opening 1a. . Immediately after the opening 1a is fully opened, the shutter blade 3 contacts the stopper pin 1d and the shutter blade 4 contacts the stopper pin 1f, and the rotation of the permanent magnet rotor 5 is stopped. Thereafter, when the energization of the stator coil is cut off, the imaging standby state shown in FIG. 1 is restored.

  By the way, the above explanation of the operation has been made in the case where the shutter device of the present embodiment is adopted in a digital camera. However, in the case where it is adopted in a silver salt film camera, the state shown in FIG. When photographing, the shutter blades 3 and 4 are returned to the state shown in FIG. 2 after being fully opened as shown in FIG. In addition, although this embodiment is configured as a shutter device, it can also be used as a lens barrier device by placing it in front of the photographing lens. Therefore, such a lens barrier device is also a blade driving device of the present invention.

  Next, Example 2 will be described with reference to FIGS. As described above, this embodiment is configured as a diaphragm device. FIG. 7 is a plan view showing a state in which the aperture blade is retracted from the exposure aperture, and FIG. 8 is a plan view showing a state in which the aperture blade is inserted into the exposure aperture. 9 and 10 are partial plan views showing in detail the blade chamber in the enclosure D of FIG. 7, and FIG. 9 is a view of the main plate side from the cover plate side, and FIG. It is the figure which looked at the cover board side from the baseplate side, Comprising: Two blades arrange | positioned in a blade chamber are shown by both of them. The configuration of the present embodiment is that the two shutter blades 3 and 4 in the first embodiment are replaced with the light shielding blade 6 and the aperture blade 7, and the positions of the stopper pins 1c, 1d, and 1e are as follows. Only the structure is changed, and other configurations are substantially the same as those in the first embodiment. Therefore, a cross-sectional view is not used in the description of the present embodiment, and the same reference numerals as those in the first embodiment are used for members and portions other than the light shielding blade 6 and the diaphragm blade 7.

  First, the configuration of this embodiment will be described. The base plate 1 of the present embodiment is made of synthetic resin, and forms a subject optical path opening 1a that is circular around the optical axis. A relatively large portion is formed in the lower right part of the opening 1a. Although the hole 1b is formed, the opening 1a has a diameter larger than that of the first embodiment. The cover plate 2 constituting the blade chamber with the base plate 1 is also made of synthetic resin, and is partially omitted in FIGS. 7 and 8, but overlaps the opening 1a. A subject optical path opening 2a having a slightly larger diameter than the opening 1a is formed. Therefore, also in the present embodiment, the exposure opening is restricted by the opening 1a.

  As shown in FIGS. 7 and 8, four stopper pins 1c, 1d, 1e, 1f and two blade mounting shafts 1g, 1h are erected on the surface of the base plate 1 on the blade chamber side. However, as described above, among the four stopper pins 1c, 1d, 1e, and 1f, the arrangement positions of the three stopper pins 1c, 1d, and 1e are different from those in the first embodiment. In addition, on the surface of the cover plate 2 on the blade chamber side, four recess portions into which the tips of the stopper pins 1c, 1d, 1e, and 1f are inserted are formed, but in FIG. 7 and FIG. Since the cover plate 2 is partially cut away, only the circular recess 2c into which the tip of the stopper pin 1d is inserted and the bullet-shaped recess 2e into which the tip of the stopper pin 1f is inserted are shown. It is shown.

  7 and 8, the rotor mounting shaft 1j erected on the surface outside the blade chamber of the main plate 1 and the permanent magnet rotor 5 rotatably mounted on the rotor mounting shaft 1j are shown in the above-described drawings. 1 and FIG. 2 are shown. Further, as shown in FIG. 9, a thick portion 1 i is formed on the surface of the base plate 1 on the blade chamber side, and as shown in FIG. 10, the blade of the cover plate 2. A thick portion 2f is formed on the chamber-side surface so as to be substantially opposed to the thick portion 1i. The thick portions 1i and 2f have the same shapes as those of the first embodiment. It is exactly the same as the case. And also in the case of the blade mounting shaft 1h of the present embodiment, although not shown, like the blade mounting shaft 1h shown in FIG. It is composed of a deformed shaft portion 1h-2 on the base side of a shape that is partially cut in the radial direction. In FIG. 9, in order to understand the cross-sectional shape of the deformed shaft portion 1h-2, the cut portion is cut out. The space formed as shown is hatched.

  In the case of the present embodiment, a light shielding blade 6 and a diaphragm blade 7 are arranged in a blade chamber constituted by the base plate 1 and the cover plate 2. Among them, the light-shielding blade 6 arranged on the base plate 1 side has a long hole 6a, as clearly shown in FIGS. 9 and 10, and is rotatably attached to the blade mounting shaft 1g. It has been. Further, the diaphragm blade 7 arranged on the cover plate 2 side has a diameter larger than that of the long hole 7a clearly shown in FIGS. 9 and 10 and the opening 1a as shown in FIGS. It has a small opening 7b and is rotatably attached to a cylindrical shaft portion 1h-1 of the blade mounting shaft 1h. The light shielding blade 6 operates between the reference surface 1 i-1 of the base plate 1 and the high level surface 2 f-2 of the cover plate 2, and the diaphragm blade 7 is connected to the high level surface 1 i-2 of the base plate 1 and the cover plate 2. It operates between the reference surface 2f-1. For this reason, in this embodiment, a part of the light shielding blade 6 operates in a space formed as if a part of the blade mounting shaft 1h is cut off in the radial direction. The drive pins 5c of the permanent magnet rotor 5 are fitted into the long holes 6a and 7a of both the blades 6 and 7, respectively.

  Next, the operation of this embodiment will be described. FIG. 7 shows a shooting standby state in which the camera is turned on. At this time, the light shielding blade 6 and the diaphragm blade 7 are retracted from the exposure opening and are not energized to a stator coil (not shown) of the electromagnetic actuator. However, for the reason described in the first embodiment, the light shielding blade 6 is maintained in contact with the stopper pin 1d, and the aperture blade 7 is maintained in contact with the stopper pin 1f.

  When the release button is pressed at the time of shooting, prior to the start of shooting, the photometry circuit automatically determines whether shooting is performed using the aperture blade 7 or not. If it is determined by the photometry circuit that shooting is performed without using the aperture blade 7, shooting is performed using, for example, the shutter device shown in the first embodiment while maintaining the state of FIG. 7. However, when it is determined by the photometry circuit that photographing is performed using the aperture blade 7, current is supplied to a stator coil (not shown), so that the permanent magnet rotor 5 is rotated clockwise from the state of FIG. The light shielding blade 6 is rotated clockwise by the drive pin 5c, and the diaphragm blade 7 is rotated counterclockwise by the drive pin 5c to enter the opening 1a. At this time, the light-shielding blade 6 does not interfere with the blade mounting shaft 1h and always operates in a space formed by cutting out a part of the blade mounting shaft 1h. Then, it is made to enter the opening 1a at a speed higher than the conventional speed.

  After the two blades 6 and 7 have entered the opening 1a in this way, the light-shielding blade 6 contacts the stopper pin 1e, and the diaphragm blade 7 contacts the stopper pin 1c, whereby the permanent magnet rotor. The rotation of 5 is stopped. FIG. 8 shows the stopped state. At this time, the subject optical path is restricted by the opening 7b. As can be seen from FIG. 8, in the case of the present embodiment, the light shielding blade 6 covers a part of the opening 1a that cannot be covered only by the diaphragm blade 7 alone. Therefore, the aperture blade 7 can be reduced by that amount, and the accommodation space when the aperture blade 7 is retracted from the opening 1a (that is, in the state of FIG. 7) can be reduced. ing.

  In this way, when the state shown in FIG. 8 is reached, shooting is started immediately. When the photographing is finished, a current in the reverse direction is supplied to a stator coil (not shown), contrary to the above. Therefore, in the state shown in FIG. 8, the permanent magnet rotor 5 is rotated counterclockwise, the light shielding blade 6 is rotated counterclockwise by the drive pin 5c, and the aperture blade 7 is rotated clockwise, thereby opening the opening portion. Retreat from 1a. Immediately after the opening 1a is fully opened, the light shielding blade 6 contacts the stopper pin 1d and the diaphragm blade 7 contacts the stopper pin 1f, and the rotation of the permanent magnet rotor 5 is stopped. Thereafter, when the energization to the stator coil (not shown) is cut off, the imaging standby state shown in FIG. 7 is restored.

  By the way, although this embodiment is configured as a diaphragm device, when an ND filter is attached to the diaphragm blade 7 so as to cover the opening 7b of the diaphragm blade 7, the diaphragm blade 7 of the present embodiment becomes a filter blade. Thus, the diaphragm device of this embodiment becomes a filter device. Therefore, such a filter device is also a blade driving device of the present invention.

  Next, Example 3 will be described with reference to FIGS. The present embodiment is configured as a shutter device having three shutter blades, and the operation thereof will be described in the case where it is adopted in a digital camera. FIG. 11 is a plan view showing a fully opened state of the shutter blades before photographing, and FIG. 12 is a plan view showing a closed state of the shutter blades immediately after photographing. FIGS. 13 and 14 are partial plan views showing in detail the blade chamber in the enclosure E of FIG. 11, and FIG. 13 is a view of the main plate side from the cover plate side, and FIG. It is the figure which looked at the cover board side from the main plate side, Comprising: Three shutter blades arrange | positioned in a blade chamber are shown by both of them. Further, FIG. 15 is a cross-sectional view taken along the line F-F in FIG. 11 and shows the base plate on the upper side and the cover plate on the lower side.

  First, the configuration of this embodiment will be described. The base plate 11 of the present embodiment is made of synthetic resin, and forms a subject optical path opening 11a that is circular around the optical axis. A relatively large portion is formed in the lower right part of the opening 11a. Hole 11b is formed. The cover plate 12 of this embodiment is also made of synthetic resin, and is attached to the base plate 11 by an appropriate means, and constitutes a blade chamber between the base plate 11 and the cover plate 12. 11 and 12, the cover plate 12 is shown with a part omitted, but the outer shape has the same shape as the base plate 11, and the opening portion overlaps the opening portion 11a. A subject optical path opening 12a having a slightly larger diameter than 11a is formed. Therefore, also in the present embodiment, the exposure opening is restricted by the opening 11a.

  11 and 12, five stopper pins 11c, 11d, 11e, 11f, and 11g and three blade mounting shafts 11h, 11i, and 11j are provided on the surface of the base plate 11 on the blade chamber side. It is erected. The cover plate 2 has two keyhole-shaped recesses 12b and 12c formed on the blade chamber side surface, and the tips of the stopper pins 11e and 11f are inserted into the recesses 12b and 12c. Has been. In addition to this, the cover plate 12 is formed with recesses into which the tips of the stopper pins 11c, 11d, and 11g are inserted, but their illustration is omitted.

  As shown in FIG. 13, a thick portion 11k is formed on the surface of the base plate 11 on the blade chamber side so as to surround the hole 11b and the blade mounting shafts 11h, 11i, 11j. And the end surface of the thick part 11k is divided into two by providing a step, and apart from the reference surface 11k-1 occupying most of the region, the reference surface 11k is located in the region near the blade mounting shaft 11j. The higher surface 11k-2 is slightly higher than -1. Of the three blade mounting shafts 11h, 11i, and 11j, the two blade mounting shafts 11h and 11i have a cylindrical shape. However, as can be seen from FIG. The shaft portion 11j-1 and the deformed shaft portion 11j-2 on the base side having a shape that is partially cut off in the radial direction. Then, in FIG. 13, in the same manner as in FIG. 3 and FIG. 9, the space formed in the cut-out form is shown in order to understand the cross-sectional shape of the deformed shaft portion 11 j-2. This is indicated by hatching.

  On the other hand, as shown in FIG. 14, a thick portion 12d is formed on the surface of the cover plate 12 on the blade chamber side so as to be substantially opposed to the thick portion 11k. The end surface of the thick portion 12d is also divided into a reference surface 12d-1 and a high-order surface 12d-2. Contrary to the case of the thick-walled portion 11k, the region where the high-order surface 12d-2 is formed is large. The higher surface 12d-2 is opposed to the reference surface 11k-1 of the thick portion 11k, and the reference surface 12d-1 is opposed to the high surface 11k-2 of the thick portion 11k. . Further, the cover plate 12 is formed with an arcuate recess 12e and a circular recess 12f on the reference surface 12d-1 of the thick portion 12d, and two circular recesses on the higher surface 2d-2. 12g and 12h are formed. The tip of the blade attachment shaft 11h is inserted into the recess 12h, the tip of the blade attachment shaft 11i is inserted into the recess 12g, and the tip of the blade attachment shaft 11j is inserted into the recess 12f. Yes.

  Three shutter blades 13, 14, 15 are arranged in the blade chamber constituted by the base plate 11 and the cover plate 12. Among them, the shutter blade 13 disposed on the first base plate 1 side has a long hole 13a as shown in FIG. 13, and is rotatably mounted on the blade mounting shaft 11h. The shutter blade 14 disposed in the middle has a long hole 14a and is rotatably mounted on the blade mounting shaft 11i. The shutter blade disposed on the most cover plate 12 side. 15 has a long hole 15a and is rotatably attached to the cylindrical shaft portion 11j-1 of the blade attachment shaft 11j. As can be seen from FIG. 15, the shutter blades 13 and 14 operate in a space formed as if a part of the blade mounting shaft 11 j is cut off in the radial direction.

  As shown in FIG. 15, a rotor mounting shaft 11 m is erected on the surface of the main plate 11 outside the blade chamber. And the permanent magnet rotor 16 is rotatably attached there. The permanent magnet rotor 16 has the same shape as the permanent magnet rotor 5 of the first embodiment, and includes a main body portion 16a, an arm portion 16b, and a drive pin 16c. The drive pin 16c is a base plate. 11 passes through the large hole 11b formed in the blade 11 and fits into the long holes 13a, 14a, 15a of the shutter blades 13, 14, 15 in the blade chamber, and the tip thereof is an arc shape formed in the cover plate 12. Is inserted into the recess 12e.

  Next, the operation of this embodiment will be described. FIG. 11 shows a photographing standby state in which the power of the camera is turned on. At this time, the shutter blades 13, 14, and 15 have their exposure openings (opening portions 11a) fully opened. The photographer can observe the subject image on the monitor. Further, the stator coil of the electromagnetic actuator is not energized, but as is well known, a force that rotates clockwise is applied to the permanent magnet rotor 16. For this reason, the driving pin 16c gives the shutter blades 13 and 14 a force that rotates in the clockwise direction, and the shutter blade 15 has the force that rotates in the counterclockwise direction. This fully open state is maintained by being in contact with the pin 11e. In this embodiment, the shutter blades 13 and 14 are greatly overlapped in this state. Therefore, as can be seen by comparing with the shutter blade 4 in FIG. 1 and the diaphragm blade 7 in FIG. 7, the space in the right region of the opening 11 a that houses the shutter blades 13 and 14 is large. It can be small.

  When the release button is pressed during shooting, the charge accumulated in the solid-state imaging device is released by a signal from the exposure control circuit, and exposure for shooting is started. When a predetermined time elapses, a current is supplied to the stator coil by a signal from the exposure control circuit, so that the permanent magnet rotor 16 is rotated counterclockwise, and the shutter blades 13, 14 is rotated counterclockwise, and the shutter blade 15 is rotated clockwise to close the opening 11a. In the case of this embodiment, during the operation, the shutter blades 13 and 14 are partly obtained by always forming the deformed shaft portion 11j-2 on the blade mounting shaft 11j. It comes to exist in. The shutter blade 14 is rotated faster than the shutter blade 13 because the distance from the blade mounting shaft 11i to the driving pin 16c is always shorter than the distance from the blade mounting shaft 11h of the shutter blade 13 to the driving pin 16c. It will be done.

  Immediately after the opening 11a is closed, the shutter blades 13 and 15 come into contact with the stopper pin 11c, and the shutter blade 14 comes into contact with the stopper pin 11f, whereby the rotation of the permanent magnet rotor 16 is stopped. The state shown in FIG. At this time, the opening 11 a is closed by the two shutter blades 13 and 15 even without the shutter blade 14. However, if only the shutter blades 13 and 15 are used, as can be seen from the fact that there is almost no overlap, the shutter blades 13 and 15 bounce when they come into contact with the stopper pins 11c, and re-exposure occurs. . Further, in a stationary state, light leaks from a place where there is almost no overlap. Therefore, in the present embodiment, such a situation does not occur due to the presence of the shutter blade 14.

  Thus, in the state of FIG. 12, the imaging information is transferred from the solid-state imaging device to the storage device. When the transfer ends, a current in the reverse direction is supplied to the stator coil in the opposite direction. Therefore, the permanent magnet rotor 16 is rotated clockwise, the shutter blades 13 and 14 are rotated clockwise by the drive pin 16c, the shutter blade 14 is rotated counterclockwise, and the opening 11a is opened. Go. Immediately after the opening 11a is fully opened, the shutter blade 13 contacts the stopper pin 11d, the shutter blade 14 contacts the stopper pin 11e, and the shutter blade 15 contacts the stopper pin 11g. The rotation of 16 is stopped. After that, when the energization to the stator coil is cut off, the imaging standby state shown in FIG. 11 is restored.

  As described above, the present embodiment normally has a configuration in which only one shutter blade is divided into two shutter blades 13 and 14 among two shutter blades that are reciprocally rotated in opposite directions at the same time. However, in the present invention, the other shutter blade 15 may be divided and provided with a total of four shutter blades. The operation of this embodiment has been described in the case where the shutter device of this embodiment is adopted in a digital camera. However, when the shutter device is adopted in a silver film camera, the state shown in FIG. At the time of shooting, the shutter blades 13, 14, and 15 are fully opened as shown in FIG. 11, and then returned to the state shown in FIG. In addition, although the present embodiment is configured as a shutter device, as in the case of the first embodiment, it can be used as a lens barrier device by being arranged as it is in front of the photographing lens.

  In each of the above embodiments, an electromagnetic actuator is used as the driving means. However, as is known from the past, in the present invention, a member using a spring as a driving source may be used as the driving means. Absent. Even when an electromagnetic actuator is used as the drive means, as is well known, the drive pin may not be integral with the permanent magnet rotor. Further, in the description of each of the above embodiments, the shutter device, the diaphragm device, the filter device, and the lens barrier device have been described on the assumption that they are individually united. However, the shutter device, the diaphragm device, and the filter device are described. It goes without saying that it may be unitized with other devices.

It is the top view of Example 1 which showed the shutter blade fully opened state before imaging | photography. It is the top view of Example 1 which showed the closed state of the shutter blade | wing immediately after completion | finish of imaging | photography. It is the fragmentary top view which showed in detail the blade | wing chamber in the enclosure A of FIG. 1, Comprising: It is the figure which looked at the ground plane side from the cover board side. It is the fragmentary top view which showed the blade chamber in the enclosure A of FIG. 1 in detail, Comprising: It is the figure which looked at the cover board side from the ground plane side. It is CC sectional view taken on the line of FIG. 1, Comprising: A base plate is made into the upper side and a cover board is shown below. FIG. 4 is a partial plan view showing a blade chamber in an enclosure B in FIG. 2 as seen in FIG. 3. It is the top view of Example 2 which showed the state which the aperture blade has evacuated from the exposure opening. It is the top view of Example 2 which showed the state by which the aperture blade was inserted in exposure opening. It is the fragmentary top view which showed in detail the blade chamber in the enclosure D of FIG. 7, Comprising: It is the figure which looked at the ground plane side from the cover board side. It is the fragmentary top view which showed in detail the blade chamber in the enclosure D of FIG. 7, Comprising: It is the figure which looked at the cover board side from the ground plane side. It is the top view of Example 3 which showed the shutter blade fully opened state before imaging | photography. It is the top view of Example 3 which showed the closed state of the shutter blade | wing immediately after completion | finish of imaging | photography. It is the fragmentary top view which showed in detail the blade chamber in the enclosure E of FIG. 11, Comprising: It is the figure which looked at the ground plane side from the cover board side. It is the fragmentary top view which showed the blade chamber in the enclosure E of FIG. 11 in detail, Comprising: It is the figure which looked at the cover board side from the ground plane side. It is the FF sectional view taken on the line of FIG. 11, Comprising: A base plate is made into the upper side and a cover board is shown in the lower side.

Explanation of symbols

1,11 Ground plate 1a, 2a, 7b, 11a, 12a Opening 1b, 11b Hole 1c-1f, 11c-11g Stopper pin 1g, 1h, 11h-11j Blade mounting shaft 1h-1, 11j-1 Cylindrical shaft portion 1h -2, 11j-2 Deformed shaft part 1i, 2f, 11k, 12d Thick part 1i-1, 2f-1, 11k-1, 12d-1 Reference plane 1i-2, 2f-2, 11k-2, 12d- 2 High surface 1j, 11m Rotor mounting shaft 2, 12 Cover plate 2b-2e, 2g-2i, 12b, 12c, 12e-12h Recessed part 3, 4, 13, 14, 15 Shutter blade 3a, 4a, 6a, 7a , 13a, 14a, 15a Long hole 5,16 Permanent magnet rotor 5a, 16a Main body 5b, 16b Arm 5c, 16c Drive pin 6 Light shielding blade 7 Diaphragm blade

Claims (2)

  Each has an opening for the subject optical path and forms a blade chamber between them, and two blade mounting shafts are erected on the surface on the one blade chamber side at a predetermined interval. Two base plates, two blades each having a long hole and individually rotatably attached to the two blade mounting shafts, and a drive pin fitted in the two long holes Drive means for rotating the two blades in directions opposite to each other by reciprocating the drive pin between the two blade mounting shafts in a direction substantially perpendicular to a line connecting the shafts. And at least one of the two blade mounting shafts is a radial direction over a predetermined axial length in addition to a cylindrical shaft portion to which one of the two blades is mounted. Having a deformed shaft part with a part cut away, and the two blades The other part of, a camera blade drive device is characterized in that so as to be disposed in a space of the cut portion.   The ground plate on which the two blade attachment shafts are erected is provided with a third blade attachment shaft that is adjacent to at least one of the blade attachment shafts and in a region opposite to the other blade attachment shaft. A third blade having an elongated hole for fitting the drive pin is rotatably attached to the third blade mounting shaft, and the third blade is adjacent to the third blade mounting shaft. The camera blade drive device according to claim 1, wherein the blade is attached to the blade mounting shaft and is reciprocally rotated in the same direction at different speeds simultaneously by the drive pin.

Images