JP2008116641A - Shutter device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shutter device for a camera constituted so that a shutter blade attached to a blade shaft may not fall in the midst of actuation even when the tip of either blade shaft exists in a blade chamber out of two blade shafts to which two shutter blades are attached. <P>SOLUTION: The blade chamber is constituted between a bottom board 1 and a cover plate 2, and the tip of the shorter blade shaft 1f, out of the blade shafts 1f and 1g erected on the bottom board 1, exists in the blade chamber and the tip of the longer blade shaft 1g is inserted in a hole 2c provided on the cover plate 2. The shutter blade 8 arranged on the bottom board 1 side is rotatably attached to the blade shaft 1f, the shutter blade 9 arranged on the cover plate 2 side is rotatably attached to the blade shaft 1g, and the blade shaft 1f is inserted in a circular-arc shaped slot 9a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shutter device for a camera, generally called a lens shutter.

  In the camera shutter device, a blade chamber is formed between the base plate and the cover plate, and the blade chamber is rotatably attached to each blade shaft standing on the base plate in the blade chamber. There is known a shutter device in which two shutter blades are reciprocally rotated in opposite directions at the same time by driving means to open and close an opening for a photographing optical path. Recently, there is a great demand for thinning (reducing the dimension in the direction along the optical axis) for this type of shutter device, so that the cover plate is also made as thin as possible. Further, when the shutter blade is operated at high speed, it may be greatly deformed and fall off from the blade shaft when it comes into contact with the stopper when stopped. Therefore, in order to avoid such a situation, it is known that the tip of the blade shaft is inserted into the hole of the thin cover plate and is configured to protrude out of the blade chamber. It is described in the following Patent Document 1.

  In addition, this type of shutter device is sometimes configured as a unit together with the aperture device, and such a unit has been called a shutter device with an aperture for a long time. In order to prevent the shutter blades and the diaphragm blades from colliding with the other blades during operation, the base plate and the cover plate are partitioned by an intermediate plate to form two blade chambers, and the shutter plate is placed in the blade chamber on the main plate side. It is known that a blade is disposed and a diaphragm blade is disposed in a blade chamber on the cover plate side. Recently, a reduction in thickness is also required for such a device. Therefore, the intermediate plate and the cover plate are made thin, and the blade shaft of the shutter blade is inserted into the hole of the thin intermediate plate so as to protrude into the blade chamber on the cover plate side, and is erected on the ground plate. It is known that the blade shaft for the diaphragm blade is inserted into the hole in the intermediate plate and the tip thereof is inserted into the hole in the cover plate. It is described in Patent Document 2.

JP 2005-241866 A Japanese Patent Laid-Open No. 2000-60088

  By the way, as described above, in the shutter device having the configuration described in Patent Document 1, the tips of the two blade shafts protrude outside the blade chamber from the cover plate (“auxiliary ground plate” in Patent Document 1). In addition, the tip of the drive pin (“output pin” in Patent Document 1) of the drive means that causes the shutter blade to open and close and the tips of the plurality of stoppers protrude from the cover plate to the outside of the blade chamber. However, since the shutter device is required to be thin, other parts constituting the camera are disposed close to the cover plate in the camera. For this reason, the cover plate is made thin and one of them may be used, so that it is required not to project the tip out of the blade chamber. Therefore, as a configuration that makes it possible, it is only necessary that the tip of the blade shaft or the like is always present in the hole formed in the cover plate. On top of that, it is very difficult to make such a configuration.

  Further, as described above, in the shutter device with a diaphragm having the configuration described in Patent Document 2, the tip of the two blade shafts has a blade chamber on the side of the cover plate (“auxiliary base plate” in Patent Document 2) from the intermediate plate. Sticks out. In addition, in the blade chamber on the cover plate side, there is a drive pin (“output pin” in Patent Document 2) of drive means for causing the shutter blade to open and close, and there are a plurality of stoppers not shown. Will be. Therefore, in order to arrange the diaphragm blades in the blade chamber, the shape and the arrangement position are restricted, and the degree of design freedom is impaired. Therefore, as a configuration that makes it possible, at least one of the tip of the blade shaft of the shutter blade, the tip of the shutter blade stopper, and the tip of the drive pin that rotates the shutter blade is always attached to the intermediate plate. Although it is only necessary to make it exist in the hole, as in the case of the cover plate, since the intermediate plate is thin, it is very difficult to construct it in production.

  The present invention has been made to solve such problems, and the object of the present invention is to cause two shutter blades to be simultaneously reciprocated in opposite directions by the drive pins of the drive means. In the shutter device that opens and closes the opening for the photographing optical path, the tip of one blade shaft of the two blade shafts that are erected on the base plate and rotatably mounted with two shutter blades is The shutter blade attached to the blade shaft does not fall off during operation even if it is present in the blade chamber without protruding out of the blade chamber of the shutter blade, and thereby, the shutter blade outside the blade chamber. It is an object to provide a camera shutter device in which the space effect is suitable.

  In order to achieve the above object, the camera shutter device of the present invention has an opening for a photographing optical path, is short on the surface on the blade chamber side, and is long with the first blade shaft in the blade chamber. The blade chamber is formed between the ground plate having the second blade shaft standing upright, the opening for taking the optical path of light, and the hole for inserting the tip of the second blade shaft. A cover plate having a long hole, a first shutter blade rotatably attached to the first blade shaft in the blade chamber, and a first shutter blade having a long hole in the blade chamber. A drive pin that is fitted to both the second shutter blade disposed on the cover plate side of the blade and rotatably attached to the second blade shaft, and the long holes of the two shutter blades The two shutters are moved by reciprocating the drive pin. So that and a driving means for being rotated in opposite directions blade simultaneously perform opening and closing operation of the opening. In that case, it is more preferable that the second shutter blade has an arc-shaped long hole centered on the second blade shaft, and the first blade shaft is inserted into the long hole. It becomes a composition.

  Further, in the above-described configuration, there is further provided a second hole in addition to the opening for the photographing optical path and the first hole for inserting the tip of the second blade shaft, and between the ground plate and the cover plate. A first blade chamber in which the two shutter blades are arranged on the base plate side is formed on the base plate side, and an intermediate plate forming a second blade chamber is provided on the cover plate side, and the base plate is erected. A light quantity control blade rotatably attached to the third blade shaft inserted from the second hole of the intermediate plate in the second blade chamber, and a drive pin. Second drive means for reciprocatingly rotating the light amount control blade by reciprocating and moving it forward and backward in the photographing optical path, and the tip of the first blade shaft is in the first blade chamber, and is attached to the cover plate. Of the second blade shaft and the third blade shaft At least the third hole for inserting the tip of the blade shaft Chi may be are formed.

  According to the present invention, the tip of the blade shaft to which one of the blade blades mounted on the main plate is attached does not protrude outside the blade chamber of the shutter blade as in the prior art, and the blade shaft enters the blade chamber. Even if it exists, the shutter blade is disposed closer to the main plate than the other shutter blade, so that it does not fall off the blade shaft during operation. In addition, the space outside the blade chamber can be advantageously utilized, so that the arrangement design in the camera can be suitably performed, and when another blade chamber is configured adjacently. There is a feature that the degree of freedom of the shape and arrangement design of the light quantity control blade (aperture blade, filter blade) arranged in the blade chamber is increased.

  The embodiment of the present invention will be described with reference to two illustrated examples. In the present invention, it is possible to configure a shutter device in which only one blade chamber is provided between the ground plate and the cover plate, and two shutter blades are disposed therein, and an intermediate plate is provided between the ground plate and the cover plate. Two blade chambers are formed by partitioning with each other, two shutter blades are disposed in the blade chamber on the base plate side, and exposure control blades (aperture blades or filter blades) are disposed in the blade chamber on the cover plate side. A shutter device can also be used. And Example 1 is comprised like the former, Example 2 is comprised as what was equipped with the aperture blade among the latter. In addition, the shutter devices of those embodiments can be used not only for digital cameras but also for cameras using silver halide films, but their operation is adopted for digital cameras. I will explain in the case of. 1 to 3 are for explaining the first embodiment, and FIGS. 4 to 8 are for explaining the second embodiment.

  A first embodiment will be described with reference to FIGS. 1 is a plan view showing the photographing standby state of the present embodiment, FIG. 2 is a cross-sectional view showing the overlapping relationship of the constituent members of the present embodiment, and FIG. 3 shows the photographing end state. It is the shown top view. First, the configuration of this embodiment will be described. The base plate 1 of the present embodiment is made of synthetic resin, is relatively thick and has a complicated shape as can be seen from FIG. 2, and as shown in FIG. Opening 1a is formed. Further, a cover plate 2 is attached to the base plate 1 by means (not shown) at a predetermined interval, and a single blade chamber is formed between the two. Although the cover plate 2 is shown in FIG. 1 with a part thereof broken, as shown in FIG. 3, the cover plate 2 has substantially the same planar shape as the base plate 1 and the opening portion described above. At a position facing 1a, an opening 2a for the photographing optical path having a slightly larger diameter than the opening 1a is provided.

  As shown in FIG. 2, two mounting shafts 1b and 1c and a rotor shaft 1d are erected on the surface of the main plate 1 outside the blade chamber by integral molding. Among them, the mounting shafts 1b and 1c were cylindrical at the stage of manufacturing the main plate 1. However, when the motor frame 3 is mounted, the mounting shafts 1b and 1c are inserted into holes provided in the motor frame 3 and their tips are thermally melted. It is deformed into a flange shape. In the actuator chamber formed between the main plate 1 and the motor frame 3, an electromagnetic actuator serving as a shutter blade driving unit, which will be described later, is disposed.

  The electromagnetic actuator of the present embodiment is not shown in the planar shape of the constituent members, but has a configuration similar to that of a known electromagnetic actuator disclosed in Japanese Patent Laid-Open No. 2003-186079. That is, the rotor 4 of the present embodiment has a substantially cylindrical shape and is made of a permanent magnet main body 4a magnetized in two radial directions, and a synthetic resin integrated with the main body 4a. Arm portion 4b and a drive pin 4c formed at the tip of the arm portion 4b, and is rotatably attached to the rotor shaft 1d. The drive pin 4c is inserted into the blade chamber from a well-known long hole 1e formed in an arc shape in the base plate 1, and its tip is formed in the cover plate 2 and has a shape similar to that of the long hole 1e. It is inserted in the hole 2b. In the present embodiment, the arm portion 4b and the drive pin 4c are made of synthetic resin, but it is also known that they are made of permanent magnets.

  Next, the configuration of the stator will be described. In the case of the electromagnetic actuator described in the above-mentioned Japanese Patent Application Laid-Open No. 2003-186079, two yokes having two leg portions and having a substantially U shape are arranged to overlap each other. In the case of the example, they are made into one part and arranged as a yoke 5. The yoke 5 is fitted with a bobbin 7 around which the coil 6 is wound on one leg, and the tip of both legs is a magnetic pole, and the circumference of the rotor 4 is sandwiched between the body 4a. It faces the surface. In the case of the present embodiment, the motor frame 3 and the bobbin 7 are separate members, but it is also known that they are formed as a single component by integral molding with a synthetic resin.

  As shown in FIG. 1, two blade shafts 1f, 1g and four stopper shafts 1h, 1i, 1j, 1k are erected on the surface of the base plate 1 on the blade chamber side by integral molding. . Among them, the two blade shafts 1f and 1g have different lengths, and the tip of the shorter blade shaft 1f exists in the blade chamber, but the longer blade shaft 1g has its tip. Is inserted into a hole 2 c provided in the cover plate 2. The stopper shafts 1h, 1i, 1j, 1k have their tips inserted into holes 2d, 2e, 2f, 2g provided in the cover plate 2.

  Two shutter blades 8 and 9 are arranged in the blade chamber. Among them, the shutter blade 8 disposed on the base plate 1 side is rotatably attached to the blade shaft 1f, and a known long hole is fitted to the drive pin 4c of the rotor 4 described above. ing. Further, the shutter blade 9 disposed on the cover plate 2 side is rotatably attached to the blade shaft 1g, and a known long hole is fitted to the drive pin 4c of the rotor 4 described above. In addition, the shorter blade shaft 1f is inserted into the long hole 9a formed in an arc shape centering on the blade shaft 1g. 1 and 3, the main body 4a of the rotor 4 is not shown, but the rotor shaft 1d is erected outside the blade chamber at a position near the blade shaft 1f. Therefore, in FIG. 1, when the rotor 4 (not shown) rotates in the counterclockwise direction, the drive pin 4c moves in the arc-shaped elongated holes 1e, 2b formed in a substantially lower right direction. Then, when it rotates in the clockwise direction, it moves in the substantially upper left direction.

  Next, the operation of this embodiment will be described. FIG. 1 shows a photographing standby state, and the shutter blades 8 and 9 fully open the opening 1a. For this reason, a solid-state image sensor (not shown) is exposed to subject light, and the photographer can observe the subject image on the monitor. At this time, the coil 6 of the electromagnetic actuator is not energized. However, as is well known, at this time, the rotor 4 is urged to rotate in the clockwise direction by the magnetic attraction force acting between the main body portion 4a and the yoke 5, thereby driving the rotor 4. A force is applied to the pin 4c to move substantially upward in the left direction in FIG. 1 to rotate the shutter blade 8 in the clockwise direction and rotate the shutter blade 9 in the counterclockwise direction. However, the shutter blades 8 and 9 are in contact with the stopper shafts 1h and 1i and are prevented from rotating, and this state is maintained.

  When the release button is pressed at the time of shooting, the charge accumulated in the solid-state image sensor is released, shooting is started, and new charge is accumulated in the solid-state image sensor. When a predetermined time elapses, a forward current is supplied to the coil 6 by a signal from the exposure time control circuit. Therefore, the rotor 4 is rotated counterclockwise, and the drive pin 4c is moved substantially in the lower right direction in FIG. 1, so that the shutter blade 8 is rotated counterclockwise, and the shutter blade 9 is It can be rotated clockwise. Thereby, the two shutter blades 8 and 9 close the opening 1a, and when the opening 1a is closed, immediately after that, the shutter blade 8 abuts against the stopper shaft 1j, and the shutter blade 9 contacts the stopper shaft. Abut 1k.

  In this way, when the shutter blades 8 and 9 are brought into contact with the stopper shafts 1j and 1k, the shutter blades 8 and 9 are greatly bent by the impact, thereby slightly bending the thin cover plate 2 instantaneously. It may end up. Therefore, conventionally, if the tip of the blade shaft 1f is in the blade chamber as in the blade shaft 1f of the present embodiment, the shutter blade 8 may fall off the blade shaft 1f. Both the blade shafts 1f and 1g have their tips inserted into holes provided in the cover plate 2 so that no gap is formed between the tips and the cover plate. However, in the case of the present embodiment, there is no concern that such a situation will occur. This is because the shutter blade 8 is disposed on the base plate 1 side and the shutter blade 9 is disposed between the cover plate 2 and the shutter blade 8. That is, it is rare that a gap of one or more shutter blades is formed between the tip of the mounting shaft 1f and the cover plate 2, and only when the other shutter blade 9 is pushed, This is because a large force that moves to the tip of the mounting shaft 1 f is not at all applied. Therefore, in this embodiment, when the shutter blades 8 and 9 come into contact with the stopper shafts 1j and 1k, such a situation does not occur, and the rotation of the rotor 4 is stopped. FIG. 3 shows the stop state.

  In this manner, when the state shown in FIG. 3 is reached, the electric charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information. When the transfer is completed, a reverse current different from the above is supplied to the coil 6, so that the rotor 4 is rotated in the clockwise direction, and the drive pin 4c is moved in the upper left direction in FIG. I will move it. Therefore, the shutter blades 8 and 9 are rotated in opposite directions to open the opening 1a. When the opening 1a is fully opened, immediately after that, the shutter blade 8 contacts the stopper shaft 1h, and the shutter blade 9 contacts the stopper shaft 1i, thereby stopping the rotation of the rotor 4. Although an impact also occurs at this time, as described above, there is no concern that the shutter blade 8 will fall off the mounting shaft 1f. Thereafter, when the energization of the coil 6 is cut off, the state shown in FIG. 1 is restored.

  As described above, according to the present embodiment, even if the cover plate 2 is made thin, the tip of the blade shaft 1f can be kept in the blade chamber. The arrangement design of the members adjacent to 2 becomes easy.

  Next, Embodiment 2 shown in FIGS. 4 to 8 will be described. This embodiment is configured as a shutter device with an aperture. 4 is a plan view showing a photographing standby state, and FIG. 5 is a cross-sectional view shown in the same manner as FIG. FIG. 6 is a plan view showing a photographing end state performed without the diaphragm blades facing the photographing optical path. Further, FIG. 7 is a plan view showing a state in which the diaphragm blades face the photographing optical path, and FIG. 8 is a plan view showing a photographing end state performed in the state of FIG. FIG. 4 shows the cover plate 2 and the intermediate plate 10 with a part thereof broken, and the plan views of FIGS. 6 to 8 make it easy to see the blade chamber in which the diaphragm blades are arranged. For this purpose, the cover plate 2 shown in FIG. 4 is removed and shown.

  First, the configuration of the present embodiment will be described. The mounting configuration of the shutter blades in this embodiment and the configuration of the electromagnetic actuator that is a driving unit for the shutter blades are substantially the same as those in the first embodiment. Therefore, in each drawing, those constituent members and portions are denoted by the same reference numerals as those in the first embodiment. Therefore, a detailed description thereof will be omitted, and only a configuration different from that in the first embodiment will be described.

  In this embodiment, the base plate 1 and the cover plate 2 are partitioned by the intermediate plate 10, the shutter blades 8 and 9 are arranged in the blade chamber configured on the base plate 1 side, and the blade chamber configured on the cover plate 2 side. The diaphragm blades 11 are arranged on the front side. Therefore, first, the intermediate plate 10 has substantially the same planar shape as the cover plate 2 and is opposite to the openings 1a and 2a described above, and has the same size as the opening 2a. Is forming. In addition, a long hole 10b having the same shape as the long hole 2b is formed in the intermediate plate 10 so as to face the long holes 1e and 2b, and the holes 2c, 2d, 2e, and Holes 10c, 10d, 10e, 10f, and 10g having the same shape as those are formed at positions facing 2f and 2g. For this reason, the tip of the blade shaft 1f is present in the blade chamber on the main plate 1 side, but the blade shaft 1g and the stopper shafts 1h, 1i, 1j, 1k 10f and 10g are penetrated and the front-end | tips are inserted in the holes 2c, 2d, 2e, 2f and 2g of the cover plate 2. Further, the drive pin 4 c of the rotor 4 described above passes through the long holes 1 e and 10 b and the tip thereof is inserted into the long hole 2 b of the cover plate 2.

  In the case of the present embodiment, one blade shaft 1m and two stopper shafts 1n and 1p are further erected on the surface of the base plate 1 on the blade chamber side. Among them, the blade shaft 1 m passes through the hole 10 h formed in the intermediate plate 10, and the tip thereof is inserted into the hole 2 h formed in the cover plate 2. The stopper shafts 1n and 1p pass through holes 10i and 10j formed in the intermediate plate 10, and their tips are inserted into holes 2i and 2j formed in the cover plate 2, respectively.

  The diaphragm blades 11 arranged in the blade chamber on the cover plate 2 side include a diaphragm opening 11a having a circular shape smaller than the opening 1a, and, in operation, the blade shaft 1g and the drive pin 4c. It has an opening 11b for preventing interference and is rotatably attached to the blade shaft 1m. An electromagnetic actuator for reciprocating the diaphragm blade 11 (hereinafter referred to as a second electromagnetic actuator) is substantially the same as the above-described electromagnetic actuator for reciprocating the shutter blades 8 and 9 (hereinafter referred to as a first electromagnetic actuator). Have the same structure. Therefore, although the illustration of the entire configuration is omitted, only the drive pin 12 that rotates integrally with the rotor is shown in FIGS. 4 and 6 to 8. And since the rotor is rotatably attached to the surface outside the blade chamber of the main plate 1, the drive pin 12 is formed in the arc-shaped long hole 1 q formed in the main plate 1 and the intermediate plate 10. It penetrates the long hole 10k having the same shape and is fitted into a known long hole formed in the diaphragm blade 11 in the blade chamber on the cover plate 2 side, and the tip thereof has the same shape as the long holes 1q and 10k. Are inserted into the long holes 2k formed in the cover plate 2. Therefore, in FIG. 4, the drive pin 12 moves substantially to the right when a rotor (not shown) rotates counterclockwise, and then returns to the position of FIG. 4 when the rotor rotates clockwise. It has become.

  Next, the operation of this embodiment will be described. FIG. 4 shows a photographing standby state, and the shutter blades 8 and 9 fully open the opening 1a. Further, the diaphragm blade 11 does not enter the opening 1a and is in a retracted state. For this reason, a solid-state image sensor (not shown) is exposed to subject light, and the photographer can observe the subject image on the monitor. At this time, the coil of each electromagnetic actuator is not energized. However, at this time, the rotor of the first electromagnetic actuator is urged to rotate clockwise by the magnetic attractive force acting between the main body portion 4a and the yoke 5, and the second electromagnetic actuator Similarly, the rotor is also biased to rotate clockwise. Therefore, the drive pin 4c tries to rotate the shutter blade 8 in the clockwise direction and the shutter blade 9 in the counterclockwise direction, and the drive pin 12 tries to rotate the diaphragm blade 11 in the counterclockwise direction. This state is maintained by the blades 8, 9, and 11 being in contact with the stopper shafts 1h, 1i, and 1n.

  When the release button is pressed at the time of shooting, in the initial stage, first, subject light is measured by the photometry circuit. As a result, when it is determined that the subject light is dimmed, the aperture blade 11 is first opened. When actual shooting is started after entering the unit 1a and it is determined that shooting is performed without dimming the subject light, the charge accumulated in the solid-state imaging device is immediately released, and shooting is performed. Be started. However, in the latter case, only the shutter blades 8 and 9 are reciprocally rotated by the first electromagnetic actuator. Therefore, the explanation of the operation thereof is the same as the cover plate 2 and the intermediate plate 10 in the explanation of the operation of the first embodiment. It becomes the same just to read. Therefore, in order to avoid duplication, description of the operation in the latter case is omitted, and the state corresponding to FIG. 3 of the first embodiment is only shown in FIG.

  Therefore, a case will be described in which when the release button is pressed during shooting, it is determined that the subject light is dimmed based on the measurement result of the photometry circuit. In this case, first, a forward current is supplied to the coil of the second electromagnetic actuator. Thereby, the rotor (not shown) is rotated counterclockwise, and in FIG. 4, the drive pin 12 is moved substantially to the right. Thereby, the aperture blade 11 is rotated clockwise and enters the opening 1a. When the center of the aperture opening 11a reaches the center position of the aperture 1a, the aperture blade 11 comes into contact with the stopper shaft 1p and stops. FIG. 7 shows the state at that time.

  Immediately after entering this state, the charge accumulated in the solid-state image sensor is released, imaging is started, and new charges are accumulated in the solid-state image sensor. When a predetermined time elapses, a forward current is supplied to the coil 6 of the first electromagnetic actuator by a signal from the exposure time control circuit. As a result, the rotor 4 is rotated counterclockwise, so that the driving blade 4c causes the shutter blade 8 to rotate counterclockwise and the shutter blade 9 clockwise to close the opening 1a. When the opening 1a is completely closed, immediately after that, the shutter blade 8 comes into contact with the stopper shaft 1j and the shutter blade 9 comes into contact with the stopper shaft 1k, thereby stopping the rotation of the rotor 4. However, at this time, even if the thin intermediate plate 10 is momentarily deformed by an impact, the shutter blade 9 is disposed between the shutter blade 8 and the intermediate plate 10, so that the shutter blade 8 is connected to the blade shaft 1 f. There is no such thing as dropping out of. FIG. 7 shows a state in which the shutter blades 8 and 9 are stopped as described above.

  In the state of FIG. 7, when the charge accumulated in the solid-state imaging device is transferred to the storage device as imaging information, a current in the reverse direction is supplied to the coil of the first electromagnetic actuator. Is rotated in the clockwise direction, and the shutter blades 8 and 9 are rotated in opposite directions by the drive pin 4c to perform the opening operation of the opening 1a. On the other hand, since the current in the reverse direction is supplied also to the coil of the second electromagnetic actuator, the rotor is rotated in the clockwise direction, and the aperture pin 11 is rotated in the counterclockwise direction by the drive pin 12 to open the aperture. Retreat from part 1a. The shutter blades 8 and 9 are stopped by contacting the stopper shafts 1h and 1i immediately after the opening 1a is fully opened, but even if the intermediate plate 10 is instantaneously deformed by the impact at that time. The shutter blade 8 does not fall off the blade shaft 1f. On the other hand, the diaphragm blade 11 is brought into contact with the stopper shaft 1n and stopped immediately after it is completely retracted from the opening 1a. Thereafter, when the energization of the coils of both electromagnetic actuators is cut off, the state shown in FIG. 4 is restored.

  In this embodiment, as can be seen from FIGS. 4 and 7, the aperture blade 11 disposed in the blade chamber on the cover plate 2 side is in the blade chamber on the ground plate 1 side at any operating position. It exists on the extension line of the blade shaft 1f. Therefore, if the blade shaft 1f protrudes from the hole formed in the intermediate plate 10 into the blade chamber on the cover plate 2 side as in the prior art, the diaphragm blade 11 can be arranged as in this embodiment. become unable. However, even if the tip of the blade shaft 1f is present in the hole formed in the intermediate plate 10 by design, the intermediate plate 10 is thin, so that it can actually be manufactured as such. It is difficult and the intermediate plate 10 is easily bent, so that it comes into contact with the diaphragm blade 11 and is damaged. However, in the case of the present embodiment, the shutter blade 8 arranged on the base plate 1 side is attached to the blade shaft 1f, and the shutter blade 9 arranged on the intermediate plate 10 side is attached to the blade shaft 1g. The tip of the blade shaft 1f can be present in the blade chamber on the main plate 1 side. As a result, the aperture blade 11 can be arranged as in the present embodiment.

  As described above, in the present embodiment, the cover plate 2 is formed with two long holes 2b and 2k and eight holes 2c, 2d, 2e, 2f, 2g, 2h, 2i and 2j. . However, among them, the long hole 2b is for inserting the tip of the drive pin 4c. However, since the drive pin 4 c is for operating only the shutter blades 8 and 9, it only needs to be inserted into the long hole 10 b of the intermediate plate 10. Therefore, it is possible to shorten the drive pin 4 c so that the long hole 2 b is not formed in the cover plate 2. Even if the long hole 2b is formed, the tip of the drive pin 4c can be prevented from protruding from the long hole 2b. The same applies to the blade shaft 1g having the tip inserted into the hole 2c and the stopper shafts 1h, 1i, 1j, 1k having the tip inserted into the holes 2d, 2e, 2f, 2g. It can also be said. Accordingly, in this case, only the tip of the drive pin 12 and the tips of the stopper shafts 1p and 1n protrude from the cover plate 2, so that the arrangement design of the members adjacent to the cover plate 2 in the camera is designed. It becomes easy.

  Furthermore, the present embodiment is configured as a shutter device with a diaphragm in which the diaphragm device is unitized as described above. However, ND filter blades are known as light quantity control blades in addition to aperture blades. Therefore, the present invention is not limited to the shutter device with an aperture as in the present embodiment, and may be configured as a shutter device with a filter in which the ND filter device is unitized together. And in order to comprise in that way, it will suffice to attach an ND filter sheet to the diaphragm blade 11 of the present embodiment so as to cover the opening 11a, but the size of the opening 11a in that case is The aperture may not be smaller than the opening 1a for the photographing optical path.

  In each of the above embodiments, the explanation of the operation has been described in the case where it is adopted in a digital camera. However, they can also be adopted in a camera using a silver salt film. And when it employ | adopts as the camera which uses a silver salt film, it cannot be overemphasized that the state shown by FIG. 3, FIG. 6 will be in a photography standby state.

It is a top view of Example 1 which shows a photography standby state. 1 is a cross-sectional view of Example 1. FIG. It is a top view of Example 1 which shows a photography end state. It is a top view of Example 2 which shows a photography standby state. 6 is a cross-sectional view of Example 2. FIG. It is a top view of Example 2 which shows the photography end state performed without using a diaphragm blade. It is a top view of Example 2 which shows the state which faced the aperture blade to the imaging optical path. FIG. 10 is a plan view of Example 2 showing a photographing end state performed in the state of FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plane 1a, 2a, 10a, 11a, 11b Opening part 1b, 1c Mounting shaft 1d Rotor shaft 1e, 1q, 2b, 2k, 9a, 10b, 10k Long hole 1f, 1g, 1m Blade shaft 1h, 1i, 1j, 1k, 1n, 1p Stopper shaft 2 Cover plate 2c to 2j, 10c to 10j Hole 3 Motor frame 4 Rotor 4a Body 4b Arm 4c, 12 Drive pin 5 Yoke 6 Coil 7 Bobbin 8, 9 Shutter blade 10 Intermediate plate 11 Aperture blade

Claims (3)

  A ground plane having an opening for the photographing optical path, the first blade axis having a short tip on the surface on the blade chamber side and the tip being in the blade chamber and a long second blade shaft, and for the photographing optical path A cover plate having a hole for inserting the opening and the tip of the second blade shaft and constituting the blade chamber between the base plate, and a long hole, the first in the blade chamber A first shutter blade that is rotatably attached to one blade shaft, and has a long hole, is disposed closer to the cover plate than the first shutter blade in the blade chamber, and is disposed on the second blade shaft. The second shutter blade rotatably mounted and a drive pin fitted in both the long holes of the two shutter blades, and by reciprocating the drive pin, the two sheets The shutter blades are simultaneously rotated in opposite directions to open and close the opening. Camera shutter apparatus characterized by comprising a driving means for.   2. The second shutter blade has an arc-shaped long hole centered on the second blade shaft, and the first blade shaft is inserted into the long hole. The camera shutter device described.   In addition to the opening for the photographing optical path and the first hole for inserting the tip of the second blade shaft, the base plate side has a second hole, and the base plate and the cover plate are separated from each other. A first blade chamber in which the two shutter blades are arranged is formed, an intermediate plate that forms a second blade chamber on the cover plate side, and a second plate of the intermediate plate that is erected on the ground plate. A light amount control blade rotatably attached to the third blade shaft inserted through the hole of the second blade chamber and a drive pin, and the light amount control blade is operated by reciprocating the drive pin. A second drive means for reciprocally rotating the first drive shaft to move back and forth in the photographing optical path, the tip of the first blade shaft is in the first blade chamber, and the cover plate includes the second blade shaft and the second drive shaft. At least the tip of the third blade shaft of the third blade shaft Camera shutter device according to claim 1 or 2, characterized in that holes be inserted.