JP2013210483A - Blade driving device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade driving device for a camera, which has two or more blade members simultaneously rotated in directions opposite each other by the drive pin of drive means, the blade driving device being free from the limitation of the shape and/position of a blade member even in a case where a stopper for accurately stopping the blade member is provided on a bottom board.SOLUTION: A blade driving device comprises: a bottom board having an exposure opening and having a first axis and second axis extending upward; a first blade member attached to the first axis so as to be rotatable, a second blade member attached to the second axis so as to be rotatable; and an electromagnetic actuator configured to reciprocally actuate a drive pin fitted in the long hole of the first blade member and the long hole of the second blade member, thereby rotating the first blade member and second blade member simultaneously in directions opposite each other, and causing it approach the opening or retract therefrom. At least one of the two blade members is stopped by contacting the shaft to which the other blade member is attached, when caused to approach the opening.

Description

  The present invention relates to a camera blade driving device that drives blade members such as shutter blades and diaphragm blades by driving means such as an electromagnetic actuator.

  As one of the shutter devices employed in compact cameras and cameras built in information terminal devices such as mobile phones, a plurality of shutter blades that are rotatably attached to the ground plane are arranged in different directions depending on driving means such as electromagnetic actuators. There is known a configuration in which the opening for exposure is opened and closed (for example, Patent Document 1). Such shutter devices are predominantly composed of two shutter blades, but some are composed of three or four shutter blades. Further, when the shutter blades are composed of three or four shutter blades, it is also known that two of the shutter blades are divided blades that simultaneously rotate in the same direction at different speeds.

  Further, in such a shutter device, when the blade member is moved back and forth to the exposure opening, in order to stop the blade member with high accuracy at the position where the exposure opening is fully opened and the position where the exposure opening is fully closed. It is also known to provide a stopper shaft for contacting the blade member (see Patent Document 1).

JP 2002-139765 A

  However, since such a stopper shaft is provided so as to protrude from the ground plate rather than the blade member in order to contact the blade member, it does not interfere with the stopper shaft when the blade member operates. As described above, there is a problem that the shape and / or arrangement of the blade member is limited.

  The present invention has been made in order to solve such problems. The object of the present invention is to provide a shape of the blade member and a stopper plate for accurately stopping the blade member even if the stopper shaft is provided on the base plate. To provide a blade driving device for a camera that is not limited in arrangement.

  In order to achieve the above object, a camera blade driving device of the present invention has an opening for exposure and has a base plate on which a first shaft and a second shaft are erected, and a long hole. A first blade member rotatably attached to the first shaft, a second blade member having a long hole and rotatably attached to the second shaft, and the first blade member A drive pin that fits into both the long hole of the second blade member and the long hole of the second blade member is reciprocated to simultaneously rotate the first blade member and the second blade member in opposite directions to the opening. An electromagnetic actuator for advancing and retreating, wherein the first blade member is stopped by contacting the second shaft when the first blade member enters the opening, and / or the second blade. The member comes into contact with the first shaft when the member enters the opening. Characterized in that it is stopped by Rukoto.

  Further, in the camera blade driving device of the present invention, when the first blade member is retracted from the opening, and is brought into contact with the second shaft when being moved into the opening. The second blade member is stopped by contacting the second shaft from a different direction, and / or when the second blade member is retracted from the opening, and is moved into the opening. It is preferable to stop by contacting the first shaft from a direction different from the case of contacting the first shaft.

  Further, the camera blade drive device of the present invention has a long hole into which the drive pin is fitted and is rotatably attached to a third shaft erected on the base plate. A third blade member that is rotated and advanced and retracted into and from the opening is provided, and the third blade member is stopped by contacting the second shaft when the third blade member is advanced into the opening. Is preferred.

  Further, the camera blade drive device of the present invention has a long hole into which the drive pin is fitted and is rotatably attached to a third shaft erected on the base plate. A third blade member that is rotated and advanced and retracted into the opening, and a long hole into which the drive pin fits, and is rotatably attached to a fourth shaft that is erected on the base plate. And a fourth blade member that is rotated by the electromagnetic actuator and moved forward and backward to the opening, and the third blade member contacts the second shaft when being moved into the opening. It is preferable that the fourth blade member is stopped by contacting the first shaft when the fourth blade member enters the opening, and / or the fourth blade member is stopped by contact.

  ADVANTAGE OF THE INVENTION According to this invention, even if the stopper axis | shaft for stopping a blade | wing member with sufficient precision is provided in a ground plate, the blade drive device for cameras which does not restrict | limit the shape and / or arrangement | positioning of a blade | wing member can be obtained.

It is a top view which shows the state by which the two shutter blades were evacuated from the opening part for exposure of the unit which used the blade drive device for cameras which concerns on Example 1 of this invention as a shutter mechanism. It is a top view which shows the state in which the two shutter blades were made to approach into the opening part for exposure of the unit which used the blade drive device for cameras which concerns on Example 1 of this invention as a shutter mechanism. It is sectional drawing along the AA of FIG. 2 of the unit which used the blade drive device for cameras which concerns on Example 1 of this invention as the shutter mechanism. It is a top view which shows the state by which the four shutter blades were evacuated from the opening part for exposure of the unit which used the blade drive device for cameras which concerns on Example 2 of this invention as a shutter mechanism. It is a top view which shows the state in which the four shutter blades were made to approach the opening part for exposure of the unit which used the blade drive device for cameras which concerns on Example 2 of this invention as a shutter mechanism. It is sectional drawing along the BB line of FIG. 5 of the unit which used the blade drive device for cameras which concerns on Example 2 of this invention as the shutter mechanism. It is a top view which shows the state by which two shutter blades were evacuated from the opening part for exposure of the unit which used the blade drive device for cameras which concerns on Example 3 of this invention as a shutter mechanism. It is a top view which shows the state in which the two shutter blades were made to approach the opening part for exposure of the unit which used the blade drive device for cameras which concerns on Example 3 of this invention as a shutter mechanism. It is sectional drawing along CC line of the unit which used the blade drive device for cameras which concerns on Example 3 of this invention as the shutter mechanism.

  Embodiments of a camera blade driving device according to the present invention will be described in detail with reference to the drawings. Note that the camera blade driving device according to the present invention is a shutter mechanism, which is unitized with an aperture mechanism and configured so as to be applicable to both a digital camera and a silver salt film camera. In the following first to third embodiments, description will be made assuming that the digital camera is employed.

  Hereinafter, a unit including a shutter mechanism and a diaphragm mechanism to which the camera blade driving device according to the first embodiment is applied will be described in detail with reference to FIGS.

  FIG. 1 is a plan view showing a state in which two shutter blades are retracted from an exposure opening of a unit using the camera blade driving device according to the present embodiment as a shutter mechanism. FIG. 2 is a plan view showing a state in which two shutter blades are made to enter an exposure opening of a unit having the camera blade driving device according to the present embodiment as a shutter mechanism. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2 of a unit in which the camera blade driving device according to the present embodiment is used as a shutter mechanism.

  First, the configuration of this unit will be described.

  This unit is attached to the shutter base plate 1, the intermediate plate 2, and the auxiliary base plate 3. The shutter base plate 1, the intermediate plate 2, and the auxiliary base plate 3 are integrally attached at a predetermined interval. The space between the shutter base plate 1 and the intermediate plate 2 serves as a blade chamber of the shutter blades. And the auxiliary base plate 3 is used as a blade chamber for diaphragm blades. In addition, circular opening portions 1a, 2a, and 3a (hereinafter collectively referred to as “exposure openings”) for subject light entry are formed at substantially central portions of the shutter base plate 1, the intermediate plate 2, and the auxiliary base plate 3, respectively. Has been. In FIG. 1, the openings 1a are indicated by solid lines, and the openings 2a and 3a are indicated by broken lines. Similarly in FIGS. 4 and 7 described later, the openings 2a and 3a are indicated by broken lines. In this unit, the diameter of the opening 1a is smaller than the diameter of the openings 2a and 3a, and the opening 1a regulates the exposure opening. However, the opening 2a or the opening 3a may regulate the exposure opening. The exposure opening is an opening having the maximum diameter that regulates the optical path of the subject light. The shutter base plate 1, the intermediate plate 2, and the auxiliary base plate 3 have similar outer shapes, but in FIG. 1, only a part of the intermediate plate 2 and the auxiliary base plate 3 are shown. In FIG. The intermediate plate 2 and the auxiliary base plate 3 are not shown. The same applies to FIG. 4, FIG. 5, FIG. 7, and FIG. Also, the mutual mounting configuration of the shutter base plate 1, the intermediate plate 2, and the auxiliary base plate 3 and the mounting configuration to the camera are not shown.

  The shutter base plate 1 is made of synthetic resin, and has two elongated holes 1b and 1c each having an arc shape on the left side and the lower right side of the opening 1a in FIG. Further, three shafts 1d, 1e, and 1h and four stopper shafts 1f, 1g, 1i, and 1j are formed on the surface of the shutter base plate 1 on the blade chamber side of the shutter blade. Of these three shafts, the shaft 1h is formed in a cylindrical shape. The shafts 1d and 1e are cylindrical shaft portions 1d-1 and 1e-1 and contact portions 1d-2 and 1e-2 having a shape in which a part of the column is recessed in a direction parallel to the ground plane. It is formed in the shape which has. In FIG. 1 and FIG. 2, the portions recessed to form the contact portions 1 d-2 and 1 e-2 are indicated by hatching with diagonal lines.

  Further, on the surface of the shutter base plate 1 on the blade chamber side of the shutter blade, the thick portion 1k surrounds a part around the shaft 1d, and the thick portion 1m surrounds the shaft 1e. Each is formed. And as FIG. 3 shows, the thick part 1k is formed so that it may protrude in the intermediate | middle board 2 side rather than the thick part 1m. The thick portions 1k and 1m are not shown in FIG. 1, and are indicated by hatching with dots in FIG.

  Although the intermediate plate 2 is made of synthetic resin and is not clearly shown, long holes having the same shape are formed at positions corresponding to the long holes 1b and 1c of the shutter base plate 1, and the shutter base plate Holes are formed at positions corresponding to the three shafts 1d, 1e, 1h and the four stopper shafts 1f, 1g, 1i, 1j. Further, on the blade chamber side surface of the shutter blade of the intermediate plate 2, the thick portion 2b is formed so as to surround the shaft 1d so as to be substantially opposed to the thick portions 1k and 1m of the shutter base plate 1. However, the thick portions 2c are formed so as to surround a part around the shaft 1e. As shown in FIG. 3, the thick portion 2c protrudes toward the shutter base plate 1 from the thick portion 2b, that is, opposite to the thick portions 1k and 1m. Is formed. The thick portions 2b and 2c are not shown in FIG. 2, but are indicated by hatching with dots in FIG.

  Although the auxiliary ground plate 3 is made of synthetic resin and is not clearly shown, long holes having the same shape are formed at positions corresponding to the long holes 1b and 1c of the shutter ground plate 1, and the shutter ground plate Concave portions are formed at positions corresponding to the three shafts 1d, 1e, 1h and the four stopper shafts 1f, 1g, 1i, 1j.

  A first electromagnetic actuator and a second electromagnetic actuator in which the rotor is reciprocally rotated only within a predetermined angle range on the surface side of the shutter base plate 1, that is, the surface opposite to the surface on the blade chamber side of the shutter blades. Is attached. The configurations of these electromagnetic actuators are well known (for example, various configurations such as those described in JP 2000-66267 A and those described in JP 2007-17495 A are known. Therefore, the illustration of the stator is omitted, and only the rotor 4 of the first electromagnetic actuator and the rotor 5 of the second electromagnetic actuator are illustrated. The rotors 4 and 5 are made of permanent magnets, and are composed of a cylindrical main body portion, arm portions projecting in the radial direction, and drive pins 4a and 5a provided at the tips thereof. Each is rotatably attached to a rotor mounting shaft (not shown) provided upright on the main plate 1. And this main-body part is magnetized by two poles to radial direction. The drive pin 4a passes through the long hole 1b of the shutter base plate 1 and is inserted into the blade chamber, and the drive pin 5a passes through the long hole 1c of the shutter base plate 1 and is inserted into the blade chamber. The rotor 4 is not shown in FIG. Similarly, in FIGS. 6 and 9 to be described later, the rotor 4 is not shown.

  Two shutter blades 6 and 7 are arranged in the blade chamber of the shutter blade formed between the shutter base plate 1 and the intermediate plate 2, and are rotatably attached to the shafts 1d and 1e of the shutter base plate 1. ing. Among these, the shutter blade 6 disposed on the side of the intermediate plate 2 is formed with a long hole 6a and projecting portions 6b and 6c, and rotates to the cylindrical shaft portion 1d-1 of the shaft 1d. It is attached as possible. Further, the shutter blade 7 arranged on the shutter base plate 1 side is formed with a long hole 7a and projecting portions 7b and 7c, and is rotatable to the cylindrical shaft portion 1e-1 of the shaft 1e. It is attached. The drive pin 4a of the rotor 4 is inserted into both the long holes 6a and 7a, and the two shutter blades 6 and 7 are advanced and retracted to the exposure opening as the rotor 4 rotates. . As can be seen from FIG. 3, the shutter blade 6 operates between the thick portion 1 k of the shutter base plate 1 and the thick portion 2 b of the intermediate plate 2, and the shutter blade 7 is the thick portion of the shutter base plate 1. It operates between 1 m and the thick part 2 c of the intermediate plate 2. Therefore, the shutter blade 6 is restricted from moving in the height direction of the shaft 1d and is prevented from coming off from the cylindrical shaft portion 1d-1 toward the contact portion 1d-2. The movement of the shaft 1e in the height direction is restricted so that it does not come off from the cylindrical shaft portion 1e-1 toward the contact portion 1e-2.

  One diaphragm blade 8 is disposed in the blade chamber of the diaphragm blade formed between the intermediate plate 2 and the auxiliary base plate 3, and is rotatably attached to the shaft 1 h of the shutter base plate 1. The aperture blade 8 has a long hole 8a and an opening 8b having a diameter smaller than that of the exposure opening. Since the driving pin 5a of the rotor 5 is inserted into the long hole 8a, the diaphragm blade 8 is advanced and retracted to the exposure opening as the rotor 5 rotates.

  Next, the operation of this unit will be described.

  As already described, this unit is configured to be used in a digital camera. FIG. 1 shows the initial state. That is, the digital camera used in this unit is a normally open type, and when the power is on, the shutter blade 6 is retracted from the exposure opening with its protruding portion 6b abutting against the stopper shaft 1f. The shutter blade 7 is retracted from the exposure opening with its protruding portion 7b abutting against the stopper shaft 1g. The aperture blade 8 is withdrawn from the exposure opening in contact with the stopper shaft 1i. For this reason, when the power is on, the exposure aperture is not covered by the shutter blades 6 and 7, so that the solid-state imaging device (not shown) is exposed to the subject light and the subject image can be observed on the monitor. In addition, since the diaphragm blade 8 does not cover the exposure opening, the subject image can be easily observed on the monitor. Further, at this time, the first electromagnetic actuator and the second electromagnetic actuator are not energized, but due to the well-known stator configuration, the rotor 4 rotates counterclockwise and the rotor 5 rotates clockwise. The power to do is given respectively.

  When the release button is pressed at the time of shooting, it is first determined based on the measurement result of the subject light whether to shoot with the subject light amount reduced or not. Then, when shooting with a reduced amount of subject light, a positive current is supplied to the stator coil of the second electromagnetic actuator. Thereby, the rotor 5 is rotated counterclockwise, and the diaphragm blades 8 are rotated counterclockwise via the drive pins 5 a provided on the rotor 5. Then, the diaphragm blade 8 is caused to enter the exposure opening, the opening 8b faces the exposure opening, and is stopped by contacting the stopper shaft 1j.

  Thereafter, when the charge accumulated in the solid-state imaging device is released by a signal from the exposure control circuit, exposure for photographing is started and new charges are accumulated in the solid-state imaging device. When a predetermined time elapses, a positive current is supplied to the stator coil of the first electromagnetic actuator by a signal from the exposure control circuit. Thereby, the rotor 4 is rotated in the clockwise direction, and the shutter blades 6 and 7 are rotated in opposite directions via the drive pins 4 a provided on the rotor 4. Then, the shutter blades 6 and 7 close the exposure opening. Immediately after the exposure opening is completely closed, the shutter blade 6 stops when its overhanging portion 6c contacts the contact portion 1e-2 of the shaft 1e. The shutter blade 7 is stopped when the protruding portion 7c comes into contact with the contact portion 1d-2 of the shaft 1d. FIG. 2 shows a state in which the operation of the shutter blades 6 and 7 is stopped as described above.

  In this manner, when the exposure opening is closed and the closing operation of the shutter blades 6 and 7 is stopped, the imaging information is transferred to the storage device in that state. When the transfer is completed, the stator coil of the first electromagnetic actuator is energized in the opposite direction to the above case. Accordingly, the rotor 4 is rotated counterclockwise in FIG. 2, and the shutter blades 6 and 7 are opened by the drive pin 4a. Immediately after the exposure opening is fully opened, the shutter blade 6 is stopped by the protruding portion 6b coming into contact with the stopper shaft 1f, and the shutter blade 7 is stopped by the protruding portion 7b contacting the stopper shaft 1g. Stopped by touching. On the other hand, since the stator coil of the second electromagnetic actuator is also energized in the direction opposite to the above case, the rotor 5 rotates the diaphragm blade 8 in the clockwise direction via the drive pin 5a. The diaphragm blade 8 is stopped by abutting the stopper shaft 1i after completely retracting from the exposure opening. Thereafter, when energization of the stator coils of the two electromagnetic actuators is cut off, the initial state of FIG. 1 is obtained.

  The above explanation of the operation was for shooting with the light amount of the subject light being reduced. However, when shooting is performed without reducing the light amount of the subject light, the stator coil of the second electromagnetic actuator is initially attached to the stator coil. Only the shutter blades 6 and 7 are rotated by the first electromagnetic actuator without being energized.

  According to the unit used as the shutter device to which the camera blade driving device according to the present invention configured as described above is used, the shaft to which one shutter blade is attached is used as a closing stopper for the other shutter blade. Conventionally, a closing stopper provided as a dedicated shaft becomes unnecessary. Therefore, as compared with the conventional shutter device described in FIG. 2 and the like of Patent Document 1, it is possible to increase the shape of the blade member and / or the degree of freedom of operation, and to facilitate the design. In addition, the apparatus can be miniaturized. In addition, less material is used, and costs can be reduced.

  In this unit, when the shutter blade 6 is retracted from the exposure opening, the shutter blade 6 abuts the overhanging portion 6b against the stopper shaft 1f, and the shutter blade 7 abuts the overhanging portion 7b against the stopper shaft 1g. When the shutter blade 6 is brought into contact with the exposure opening and the shutter blade 6 is brought into contact with the exposure opening, the overhanging portion 6c of the shutter blade 6 is brought into contact with the contact portion 1e-2 of the shaft 1e. It is the structure made to contact | abut to contact part 1d-2. However, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-177447, a shutter device in which a plurality of shutter blades operated by one drive pin are rotated in opposite directions to close an exposure opening. In the conventional art, a configuration in which only one of the shutter blades is brought into contact with the stopper when the shutter blade is moved back and forth in the exposure opening is also known. Therefore, also in this unit, only one of the shutter blades 6 and 7 is brought into contact with the contact portion of the corresponding one of the shafts 1e and 1d when being brought into the exposure opening. It may be configured such that when it is retracted from the exposure opening, only one of the shutter blades 6 and 7 is brought into contact with the corresponding stopper shaft of the stopper shafts 1f and 1g. It doesn't matter. In the case of such a configuration, since it is not necessary to provide both the stopper shafts 1f and 1g, only one of them may be provided.

  In this unit, the shafts 1d and 1e are composed of cylindrical shaft portions 1d-1 and 1e-1 and contact portions 1d-2 and 1e-2. For smoothness, the shafts 1d and 1e may be formed only by the contact portions 1d-2 and 1e-2 without providing the cylindrical shaft portions 1d-1 and 1e-1. And when doing so, it cannot be overemphasized that the thick parts 1k, 1m, 2b, and 2c become unnecessary.

  A unit composed of a shutter mechanism and a diaphragm mechanism to which the camera blade driving device according to the second embodiment is applied will be described in detail below with reference to FIGS.

  FIG. 4 is a plan view showing a state in which the four shutter blades are retracted from the opening for exposure in the unit using the camera blade driving device according to the present embodiment as a shutter mechanism. FIG. 5 is a plan view showing a state in which four shutter blades are made to enter the opening for exposure in a unit having the camera blade driving device according to the present embodiment as a shutter mechanism. FIG. 6 is a cross-sectional view taken along the line BB in FIG. 5 of a unit in which the camera blade driving device according to this embodiment is used as a shutter mechanism.

  First, the configuration of this unit will be described. This unit is provided with four shafts 1n, 1o, 1p, and 1q instead of the shafts 1d and 1e and the stopper shafts 1f and 1g of the shutter base plate 1 in the unit of the first embodiment, and the shutter base plate in the unit of the first embodiment. 1 thick portions 1k and 1m and intermediate plate 2 thick portions 2b and 2c are not provided, and shutter blades 9, 10, 11, and 12 are attached in place of shutter blades 6 and 7 in the unit of the first embodiment. Since the other configurations are the same as those of the unit of the first embodiment, the same members and parts as those of the unit of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Four shafts 1n, 1o, 1p, 1q are provided on the surface of the shutter base plate 1 on the blade chamber side of the shutter base plate 1 instead of the shafts 1d, 1e and the stopper shafts 1f, 1g of the shutter base plate 1 in the unit of the first embodiment. Is formed. These four shafts 1n, 1o, 1p, and 1q are composed of contact portions 1n-1, 1o-1, 1p-1, and 1q-1, and the shafts of the shutter base plate 1 in the unit of the first embodiment. 1d, 1e has a shape such that the cylindrical shaft portions 1d-1, 1e-1 are not provided, and only the contact portions 1d-2, 1e-2 are formed. Of these four axes 1n, 1o, 1p, and 1q, cross-sectional shapes of the axes 1o and 1p are shown in FIG. In addition, in FIG. 6, the part cut out from the cylinder in order to form contact part 1o-1 and 1p-1 is shown with the dashed-two dotted line.

  Four shutter blades 9, 10, 11, and 12 are arranged in the blade chamber of the shutter blade formed between the shutter base plate 1 and the intermediate plate 2, and the four shutter blades 9, 10 are arranged. , 11, 12 are rotatably attached to the shafts 1n, 1o, 1p, 1q of the shutter base plate 1, respectively. Among these, the shutter blade 9 disposed closest to the intermediate plate 2 has a long hole 9a and an overhang portion 9b, and is rotatably attached to the shaft 1n. The shutter blade 10 disposed closer to the shutter base plate 1 than the shutter blade 9 has a long hole 10a and projecting portions 10b and 10c, and is rotatably attached to the shaft 1o. Yes. The shutter blade 11 disposed on the shutter base plate 1 side of the shutter blade 10 has a long hole 11a and overhang portions 11b and 11c, and is rotatably attached to the shaft 1p. Yes. Further, the shutter blade 12 arranged closest to the shutter base plate 1 has a long hole 12a and an overhanging portion 12b, and is rotatably attached to the shaft 1q. The drive pins 4a of the rotor 4 are inserted into all the long holes 9a, 10a, 11a, 12a, and the four shutter blades 9, 10, 11, 12 are rotated with the rotation of the rotor 4. To advance and retract to the exposure aperture.

  Next, the operation of this unit will be described. In addition, description is abbreviate | omitted about the point which overlaps with the operation | movement of the unit of Example 1, and only a different point is demonstrated.

  FIG. 4 shows an initial state, in which the shutter blade 9 and the shutter blade 10 are retracted to the side of the exposure opening in an overlapping state, and the shutter blade 11 and the shutter blade 12 are also overlapped. Thus, it is retracted to a position on the side of the exposure opening that is substantially opposite to the shutter blades 9 and 10 across the exposure opening. In this state, the shutter blade 10 has its protruding portion 10b in contact with the contact portion 1n-1 of the shaft 1n, and the shutter blade 11 has its protruding portion 11b in contact with the shaft 1q. 1q-1.

  When the release button is pressed during shooting, the subject light is measured, and it is determined whether to shoot with or without reducing the amount of the subject light. When shooting with the light amount of the subject light reduced, a forward current is supplied to the stator coil of the second electromagnetic actuator and the diaphragm blade 8 enters the exposure opening, and then the shutter blades 9, 10,. 11 and 12 are activated.

  When the charge accumulated in the solid-state imaging device (not shown) is released by the signal from the exposure control circuit, exposure for photographing is started and new charges are accumulated in the solid-state imaging device. When a predetermined time elapses, a positive current is supplied to the stator coil of the first electromagnetic actuator by a signal from the exposure control circuit. Thereby, the rotor 4 is rotated in the clockwise direction, and the shutter blades 9, 10, 11, 12 are rotated via the drive pins 4 a provided on the rotor 4. At this time, the shutter blade 9 and the shutter blade 10 are rotated counterclockwise, and the shutter blade 11 and the shutter blade 12 are rotated clockwise. However, since the shutter blade 9 and the shutter blade 10 are different in the positional relationship between the fulcrum and the action point, the shutter blade 10 is rotated faster than the shutter blade 9. Therefore, in this operation, the shutter blade 9 and the shutter blade 10 cover the exposure opening while changing the overlapping amount. Similarly, the shutter blade 11 and the shutter blade 12 cover the exposure opening while changing the overlapping amount. Immediately after the four shutter blades 9, 10, 11, and 12 completely close the exposure opening, the overhang portions 9b and 10c of the shutter blades 9 and 10 contact the contact portion 1p-1 of the shaft 1p. The shutter blades 11 and 12 are stopped when the projecting portions 11c and 12b come into contact with the contact portion 1o-1 of the shaft 1o. FIG. 5 shows a state in which the operation of the four shutter blades 9, 10, 11, 12 is stopped as described above.

  When the imaging information is transferred to the storage device in the state of FIG. 5, the stator coil of the first electromagnetic actuator is energized in the opposite direction to the above case. Thereby, the rotor 4 is rotated counterclockwise in FIG. 5, and the four shutter blades 9, 10, 11 and 12 are opened by the drive pin 4a. Then, the shutter blades 9 and 10 and the shutter blades 11 and 12 are withdrawn from the exposure opening while changing the overlapping amount, and when the four shutter blades 9, 10, 11, and 12 are fully opened, Immediately thereafter, the projecting portion 10b of the shutter blade 10 contacts the contact portion 1n-1 of the shaft 1n, whereby the shutter blade 9 and the shutter blade 10 are stopped, and the projecting portion 11b of the shutter blade 11 is pivoted. The shutter blade 11 and the shutter blade 12 are stopped by contacting the 1q contact portion 1q-1. Then, a current in the opposite direction to that described above is supplied to the stator coil of the second electromagnetic actuator, and the diaphragm blade 8 is retracted from the exposure opening, and the initial state of FIG. 4 is obtained.

  The above explanation of the operation was for shooting with the light amount of the subject light being reduced. However, when shooting is performed without reducing the light amount of the subject light, the stator coil of the second electromagnetic actuator is initially attached to the stator coil. The shutter blades 9, 10, 11, 12 are merely rotated by the first electromagnetic actuator without being energized.

  According to the unit used as a shutter device to which the camera blade driving device according to the present invention configured as described above is applied, the shaft on which the shutter blade 9 is attached is used as an opening stopper of the shutter blade 10 and the shutter blade 10 is attached. The shaft on which the shutter blades 11 and 12 are attached is the closing stopper, the shaft on which the shutter blades 11 are attached is the closing stopper on the shutter blades 9 and 10, and the shaft on which the shutter blades 12 are attached is the opening stopper on the shutter blades 11. Therefore, similarly to the unit of the first embodiment, the stopper shaft that has been conventionally provided as a dedicated shaft is not necessary. Therefore, compared with the conventional shutter device, the shape of the blade member and / or the degree of freedom of operation can be increased, and the design can be facilitated. Further, among the shutter blades that close the exposure opening, the blades that are rotated in the same direction are accommodated by being overlapped when the exposure opening is fully opened. As a result, the space can be saved and the apparatus can be miniaturized. In addition, less material is used, and costs can be reduced.

  In this unit, when the shutter blade 10 is retracted from the exposure opening, the shutter blade 10 makes its protruding portion 10b contact the contact portion 1n-1 of the shaft 1n, and the shutter blade 11 has its protruding portion 11b. However, only one of the shutter blades may be brought into contact with the contact portion of each shaft.

  Further, in this unit, when the shutter blades 9 and 10 are brought into the exposure opening, the overhang portions 9b and 10c are brought into contact with the contact portions 1p-1 of the shaft 1p, so that the shutter blades 11 and 12 are brought into contact. The overhanging portions 11c and 12b are configured to contact the contact portion 1o-1 of the shaft 1o. However, at least one of the shutter blades may be brought into contact with the contact portion of each shaft.

  In the present embodiment, the four shafts 1n, 1o, 1p, and 1q are composed only of the contact portions 1n-1, 1o-1, 1p-1, and 1q-1, but the unit of the first embodiment. As described above, the shutter shaft may be formed of a cylindrical shaft portion and a contact portion, and each shutter blade may be attached to the cylindrical shaft portion and rotated. In such a case, in order to prevent the shutter blades from coming off from the cylindrical shaft portion toward the contact portion, a thick portion is provided in the vicinity of each shaft of the shutter base plate 1 and the intermediate plate 2. It is preferable that each shutter blade is restricted from moving in the height direction of the shaft.

  Hereinafter, a unit including a shutter mechanism and a diaphragm mechanism to which the camera blade driving device according to the third embodiment is applied will be described in detail with reference to FIGS.

  FIG. 7 is a plan view showing a state in which two shutter blades are retracted from the exposure opening of the unit using the camera blade driving device according to the present embodiment as a shutter mechanism. FIG. 8 is a plan view showing a state in which two shutter blades are made to enter the opening for exposure in a unit having the camera blade driving device according to the present embodiment as a shutter mechanism. FIG. 9 is a cross-sectional view taken along the line CC in FIG. 8 of the unit having the shutter driving mechanism for the camera blade according to the present embodiment.

  First, the configuration of this unit will be described. This unit is provided with shafts 1r and 1s instead of the shafts 1d and 1e and the stopper shafts 1f and 1g of the shutter base plate 1 in the unit of the first embodiment, and the thick portion 1k of the shutter base plate 1 in the unit of the first embodiment. , 1m are provided in place of the thick portions 1t, 1u, and the thick portions 2d, 2e are provided in place of the thick portions 2b, 2c of the intermediate plate 2, instead of the shutter blades 6, 7 in the unit of the first embodiment. The shutter blades 13 and 14 are attached, and other configurations are the same as those of the unit of the first embodiment. Therefore, the same members and parts as those of the unit of the first embodiment are denoted by the same reference numerals, Description of is omitted.

  On the surface of the shutter base plate 1 on the blade chamber side of the shutter blades, two shafts 1r and 1s are formed instead of the shafts 1d and 1e and the stopper shafts 1f and 1g of the shutter base plate 1 in the unit of the first embodiment. . And these shafts 1r and 1s are the cylindrical shaft portions 1r-1 and 1s-1, and the contact portions 1r-2 having a shape in which a part of the column is recessed in a direction parallel to the ground plane. , 1r-3, 1s-2, 1s-3. In FIGS. 7 and 8, portions that are recessed to form the contact portions 1r-2, 1r-3, 1s-2, 1s-3 are indicated by hatching.

  In addition, on the surface of the shutter base plate 1 on the blade chamber side of the shutter blade, a thick part 1t surrounds a part around the shaft 1r, and a thick part 1u surrounds the shaft 1s. Each is formed. And the thick part 1t is formed so that it may protrude in the intermediate | middle board 2 side rather than the thick part 1u. The thick portions 1t and 1u are not shown in FIG. 7, and are indicated by hatching with dots in FIG. Moreover, only the thick part 1u is shown in FIG.

  The intermediate plate 2 is formed with holes for passing through them at positions corresponding to the two shafts 1r and 1s of the shutter base plate 1. Further, on the surface of the shutter blade of the intermediate plate 2 on the blade chamber side, the thick portion 2d is formed so as to surround the shaft 1r so as to substantially face the thick portions 1t and 1u of the shutter base plate 1. However, the thick portions 2e are formed so as to surround a part around the shaft 1s. And this thick part 2e is formed so that it may protrude in the shutter baseplate 1 side rather than the thick part 2d, ie, it may be reverse to the thick parts 1t and 1u. The thick portions 2d and 2e are not shown in FIG. 8, and are indicated by hatching with dots in FIG. In FIG. 9, only the thick part 2d is shown.

  Two shutter blades 13 and 14 are disposed in a blade chamber formed between the shutter base plate 1 and the intermediate plate 2, and are rotatably attached to the shafts 1r and 1s of the shutter base plate 1. The shutter blade 13 disposed on the side of the intermediate plate 2 is formed with a long hole 13a and projecting portions 13b and 13c, and is rotatable to the cylindrical shaft portion 1r-1 of the shaft 1r. It is attached. Further, the shutter blade 14 arranged on the shutter base plate 1 side is formed with a long hole 14a and projecting portions 14b and 14c, and is rotatable to the cylindrical shaft portion 1s-1 of the shaft 1s. It is attached. Further, the drive pin 4a of the rotor 4 is inserted into both the long holes 13a and 14a, and the two shutter blades 13 and 14 are advanced and retracted to the exposure opening as the rotor 4 rotates. The shutter blade 13 operates between the thick portion 1t of the shutter base plate 1 and the thick portion 2d of the intermediate plate 2, and the shutter blade 14 is the thick portion 1u of the shutter base plate 1 and the thick portion of the intermediate plate 2. It operates between the thick part 2e. For this reason, the shutter blade 13 is restricted from moving in the height direction of the shaft 1r so as not to come off from the cylindrical shaft portion 1r-1 toward the contact portions 1r-2 and 1r-3. The blade 14 is restricted from moving in the height direction of the shaft 1s so that it does not come off from the cylindrical shaft portion 1s-1 toward the contact portions 1s-2 and 1s-3.

  Next, the operation of this unit will be described. In addition, description is abbreviate | omitted about the point which overlaps with the operation | movement of the unit of Example 1, and only a different point is demonstrated.

  FIG. 7 shows an initial state. The shutter blade 13 has its overhanging portion 13b abutted against the abutting portion 1s-2 of the shaft 1s, and the shutter blade 14 has its overhanging portion 14b. It is made to contact | abut to the contact part 1r-2 of the axis | shaft 1r.

  When the release button is pressed during shooting, the subject light is measured, and it is determined whether to shoot with or without reducing the amount of the subject light. When shooting with the light amount of the subject light reduced, two shutter blades 13 are supplied after a positive current is supplied to the stator coil of the second electromagnetic actuator and the diaphragm blade 8 enters the exposure opening. , 14 are activated.

  When the charge accumulated in the solid-state imaging device (not shown) is released by the signal from the exposure control circuit, exposure for photographing is started and new charges are accumulated in the solid-state imaging device. When a predetermined time elapses, a positive current is supplied to the stator coil of the first electromagnetic actuator by a signal from the exposure control circuit. Thereby, the rotor 4 is rotated in the clockwise direction, and the two shutter blades 13 and 14 are rotated in opposite directions via the drive pin 4a provided on the rotor 4 so as to perform the closing operation. . Immediately after the two shutter blades 13 and 14 completely close the exposure opening, the shutter blade 13 is stopped by the projecting portion 13c abutting against the abutting portion 1s-3 of the shaft 1s. The blade 14 is stopped when the projecting portion 14c abuts against the abutting portion 1r-3 of the shaft 1r. FIG. 8 shows a state in which the operation of the two shutter blades 13 and 14 is stopped in this way.

  When the imaging information is transferred to the storage device in the state of FIG. 8, the stator coil of the first electromagnetic actuator is energized in the opposite direction to the above case. Accordingly, the rotor 4 is rotated counterclockwise in FIG. 8, and the two shutter blades 13 and 14 are rotated in opposite directions via a drive pin 4 a provided on the rotor 4. Open operation is performed. Immediately after the two shutter blades 13 and 14 fully open the exposure opening, the shutter blade 13 is stopped by the projecting portion 13b contacting the contact portion 1s-2 of the shaft 1s, and the shutter blade 13 14 is stopped when the overhanging portion 14b abuts against the abutting portion 1r-2 of the shaft 1r. On the other hand, since the stator coil of the second electromagnetic actuator is also energized in the direction opposite to the above case, the rotor 5 rotates the diaphragm blade 8 in the clockwise direction via the drive pin 5a. The diaphragm blade 8 is stopped by abutting the stopper shaft 1i after completely retracting from the exposure opening. Thereafter, when energization of the stator coils of the two electromagnetic actuators is cut off, the initial state shown in FIG. 7 is obtained.

  The above explanation of the operation was for shooting with the light amount of the subject light being reduced. However, when shooting is performed without reducing the light amount of the subject light, the stator coil of the second electromagnetic actuator is initially attached to the stator coil. The shutter blades 13 and 14 are merely rotated by the first electromagnetic actuator without being energized.

  According to the unit used as the shutter device to which the camera blade driving device according to the present invention configured as described above is used, the shaft to which the shutter blade 13 is attached is used as the opening stopper and the closing stopper of the shutter blade 14, and the shutter Since the shaft to which the blade 14 is attached is used as an opening stopper and a closing stopper for the shutter blade 13, a stopper shaft that has been conventionally provided as a dedicated shaft is not required as in the units of the first and second embodiments. . In addition, since the number of shafts provided is smaller than the units of the first and second embodiments, the shape of the blade member and / or the degree of freedom of operation can be further increased as compared with the units of the first and second embodiments. Thus, the design can be facilitated and the apparatus can be miniaturized. In addition, less material is used, and costs can be reduced.

  In this unit, when the shutter blade 13 is retracted from the exposure opening, the shutter blade 13 abuts the projecting portion 13b on the abutting portion 1s-2 of the shaft 1s, and the shutter blade 14 projects the projecting portion 14b. When the shutter blade 13 is brought into contact with the contact portion 1r-2 of the shaft 1r and enters the exposure opening, the overhang portion 13c contacts the contact portion 1s-3 of the shaft 1s, and the shutter blade 14 The projecting portion 14c is configured to abut against the abutting portion 1r-3 of the shaft 1r. However, when retracted from the exposure opening, one of the overhang portions 13b and 14b of the shutter blades 13 and 14 may be configured to abut against the abutting portion of the corresponding shaft. When entering the exposure opening, one of the projecting portions 13c and 14c of the shutter blades 13 and 14 may be brought into contact with the contact portion of the corresponding shaft.

  In each of the above-described embodiments, the unit provided with the camera blade driving mechanism according to the present invention has been described as being employed in a digital camera. However, as described above, it may be employed in a silver salt film camera. is there. In that case, the state where the exposure opening is closed as shown in FIGS. 2, 5, and 8 is the initial state, and the shutter blade is actuated to open the exposure opening at the time of photographing, so that FIGS. As shown in Fig. 2, the exposure opening is opened, and after a predetermined exposure time has elapsed, the shutter blade is operated so that the exposure opening is closed as shown in Figs. That's fine.

  In each of the above embodiments, the shutter mechanism is configured using two or four shutter blades. However, the shutter mechanism may be configured using three shutter blades. In that case, one of the shutter blades arranged on the side of the exposure opening is formed like the shutter blade of the unit of the first embodiment, and the other is formed as a divided blade like the shutter blade of the second embodiment. What is necessary is just to form.

  In each of the above embodiments, the camera blade driving device according to the present invention is described as a shutter mechanism and unitized with a diaphragm mechanism. However, the present invention is not limited to such an embodiment. Instead, the filter mechanism using an ND filter may be unitized instead of the diaphragm mechanism, or the shutter blade driving device, the diaphragm mechanism, and the filter mechanism may be unitized. When the diaphragm mechanism is composed of two or more diaphragm blades that are rotated in opposite directions, the camera blade driving device according to the present invention may be applied to the diaphragm mechanism. In that case, only the diaphragm mechanism and the filter mechanism may be unitized. Further, as a matter of course, the shutter mechanism and / or the diaphragm mechanism to which the camera blade driving device according to the present invention is applied may be used alone without being unitized.

Shutter base plate 1
Openings 1a, 2a, 3a, 8b
Long hole 1b, 1c, 6a, 7a, 8a, 9a, 10a, 11a, 12a, 13a, 14a
Axis 1d, 1e, 1h, 1n, 1o, 1p, 1q, 1r, 1s
Stopper shaft 1f, 1g, 1i, 1j
Cylindrical shaft 1d-1, 1e-1, 1r-1, 1s-1
Contact part 1d-2, 1e-2, 1n-1, 1o-1, 1p-1, 1q-1, 1r-2, 1r-3, 1s-2, 1s-3
Thick part 1k, 1m, 1t, 1u, 2b, 2c, 2d, 2e
Intermediate plate 2
Auxiliary ground plane 3
Rotor 4,5
Drive pin 4a, 5a
Shutter blades 6, 7, 9, 10, 11, 12, 13, 14
Overhang 6b, 6c, 7b, 7c, 9b, 10b, 10c, 11b, 11c, 12b, 13b, 13c, 14b, 14c
Aperture blade 8

Claims (4)

  A base plate having an exposure opening and a first shaft and a second shaft standing; a first blade member having a long hole and rotatably attached to the first shaft; And a second blade member that has a long hole and is rotatably attached to the second shaft, and a drive that fits into both the long hole of the first blade member and the long hole of the second blade member. An electromagnetic actuator that reciprocally operates a pin to simultaneously rotate the first blade member and the second blade member in opposite directions to advance and retreat to the opening, and the first blade member The second blade member is stopped by abutting against the second shaft when being moved into the opening, and / or the second blade member is brought into contact with the first shaft when being moved into the opening. Camera blade drive characterized by being stopped by contact Apparatus.   When the first blade member is retracted from the opening, the first blade member comes into contact with the second shaft from a direction different from the case where the first blade member comes into contact with the second shaft when the first blade member enters the opening. When stopped, and / or when the second blade member is retracted from the opening, the second blade member is not in a direction different from the direction in which the second blade member comes into contact with the first shaft when being moved into the opening. The camera blade driving device according to claim 1, wherein the blade driving device is stopped by contacting the first shaft.   The drive pin has a long hole into which the drive pin is fitted. The drive pin is rotatably attached to a third shaft erected on the main plate. The drive pin is rotated by the electromagnetic actuator and moved forward and backward by the opening. 2. The camera according to claim 1, further comprising: a three-blade member, wherein the third blade member is stopped by contacting the second shaft when the third blade member is caused to enter the opening. Blade drive device.   The drive pin has a long hole into which the drive pin is fitted. The drive pin is rotatably attached to a third shaft erected on the main plate. The drive pin is rotated by the electromagnetic actuator and moved forward and backward by the opening. A three-blade member and a long hole into which the drive pin fits, and is rotatably attached to a fourth shaft erected on the base plate, and is rotated by the electromagnetic actuator and the opening. A fourth vane member that is advanced and retracted, and the third vane member is stopped by coming into contact with the second shaft when being advanced into the opening, and / or 2. The camera blade driving device according to claim 1, wherein the fourth blade member is stopped by contacting the first shaft when the fourth blade member enters the opening.

Images