JP4522691B2 - Camera blade drive - Google Patents

Description

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

  Each of the lens shutter device, the diaphragm device, and the filter device employed in the camera has one or a plurality of blades, and these are reciprocated by an actuator. These devices may be configured as independent units, but two or three of them may be configured as one unit. A typical example of those unitized as a lens shutter device is described in Patent Document 1 below. The blades provided in each device as described above are referred to as shutter blades in the shutter device and diaphragm blades in the diaphragm device, but there is no general name in the case of the filter device. Therefore, in the following, in order to distinguish from shutter blades and diaphragm blades, they will be referred to as filter blades.

By the way, in the case of a small lens shutter device, there are many that have two shutter blades, but there are also some that have one. In addition, in the case of a diaphragm device, there are those equipped with a plurality of diaphragm blades, but in the case of a small diaphragm device used for a digital still camera or a portable information terminal device, it has a small circular opening. One with a single aperture blade is common. Further, in the case of the filter device, the opening is covered with a single blade member having a shape similar to that of the above-described diaphragm blade (however, the opening may be approximately the same size as the exposure opening). In this way, an ND filter plate attached is common. However, the ND filter plate is also manufactured as a blade member, polymerized between the two blade members having the openings as described above, and these three blade members are used as filter blades to rotate simultaneously in the same angular range. Some have been made to do.
JP 2001-117137 A

  By the way, recently, digital still cameras have been considerably reduced in size, and in particular, those that have been reduced in thickness have attracted attention. Therefore, even when the shutter device, the diaphragm device, and the filter device are unitized as described above, it is necessary to reduce the size in the optical axis direction and reduce the thickness as well as to reduce the size. Has been. Also, since recent portable information terminal devices such as mobile phones and PDAs have become mainstream with cameras, these units are small in size so that they can be incorporated into these portable information terminal devices. In addition to this, it is demanded to make it thinner than ever. Moreover, it goes without saying that such a small and thin film is suitable for use in a silver salt film camera.

  However, in the case of the conventional unit, as described in Patent Document 1 above, an actuator (motor) is attached to one surface of the ground plate (shutter ground plate), and the other surface. A plate member (auxiliary base plate) was attached at a predetermined interval in order to form a blade chamber. Therefore, in order to reduce the thickness of the unit, the structure of the actuator itself is made flat (thin), the blades (shutter blades) are made thin, the ground plate (shutter ground plate) and the plate member (auxiliary ground plate) I tried to make it as thin as possible.

  However, in the case of a base plate (shutter base plate), since it must have a complicated shape, it is usually made of synthetic resin, and an actuator (motor), blade (shutter blade), etc. must be attached. In addition, it cannot be made as thin as a plate member (auxiliary base plate). On the other hand, in the case of a plate member (auxiliary ground plate), as described in Patent Document 1, the tip of the shaft of the ground plate (shutter ground plate) provided for attaching the blade (shutter blade) or The tip of the output pin (drive pin) of the actuator (motor) penetrates the plate member (auxiliary base plate) and always protrudes out of the blade chamber. This is because if the shafts and the tips of the output pins (drive pins) are shortened, the plate member (auxiliary ground plate) is bent by the operation of the blades (shutter blades), and the shaft and output pins (drive pins) This is because the fitting with the blade (shutter blade) may be disengaged. Therefore, in such a unit configuration in which the shaft and the tip of the output pin (drive pin) protrude outside the blade chamber, the arrangement configuration with other components in the camera or in the portable information terminal device is restricted. become.

  The present invention has been made in order to solve such problems, and the object of the present invention is to install both the actuator and the blade on the same side surface of the main plate. It is an object to provide a camera blade driving device having a suitable configuration in which the other surface of the main plate can be planarized over substantially the entire area even when the thickness is reduced.

In order to achieve the above object, a camera blade driving device according to the present invention regulates an exposure opening by either a ground plane having an opening for a photographing optical path or an opening for the photographing optical path. A partition plate having an opening for a photographing optical path and attached to one surface of the base plate with a predetermined interval, and disposed between the base plate and the partition plate and rotated to the base plate At least one blade attached to be able to be attached, a stator attached to the base plate with the partition plate in between at a side position of the exposure opening, and a center of rotation perpendicular to the base plate retreat more said blades to said exposure aperture to the output pin by the fact that provoking is reciprocally rotated is arranged for up stator from said base plate in spaces without the partitioning plate between the base plate and the stator So that is provided with a permanent magnet rotor, the causing.

  In that case, at least one blade shaft is provided on the one surface of the base plate, the blade is rotatably attached to the blade shaft, and the partition plate is positioned by the blade shaft. This is advantageous in terms of cost. Further, when the stator includes a bobbin member around which a coil is wound and at least one yoke attached to the bobbin member, and the bobbin member is attached to the base plate, the actuator is flattened. Thus, it is advantageous for thinning, and is advantageous in terms of both cost and space.

Further, the permanent magnet rotor, have rotatably mounted on a rotary shaft provided on the base plate or the bobbin member, the distal end portion of the rotary shaft, the positioning at the time of attachment to the base plate of the stator When you as a role to advantageous on the assembly ing. The permanent magnet rotor is rotatably attached to a rotating shaft provided on the base plate or the bobbin member, and a part of the permanent magnet rotor is in a recess formed in the bobbin member with the rotating shaft as a center. or as are present in, said base plate is, have a notch, there, whereupon or to have accepted the coil so as not protrude on the other surface, and slimming Become. Furthermore, the vane, the stator, and the rotor can be provided in another set, and even in such a case, the advantage of thinning is hardly changed. .

  According to the camera blade driving device of the present invention, since both the actuator and the blade are attached to the same side surface of the main plate, the other surface of the main plate can be made flat over substantially the entire area. Since the unit itself can be reduced in thickness, it is particularly effective when employed in a thin digital still camera or a portable information terminal device with a camera.

  The best mode for carrying out the present invention will be described by way of two illustrated examples. In these embodiments, the shutter device and the aperture device are configured as a single unit, and can be applied to a digital still camera, a portable information terminal device with a camera, and a silver salt film camera. Is. However, the operation sequence of the shutter blades is different between a camera in which a film is disposed on the image plane and a camera in which a solid-state image sensor is disposed. Therefore, in explaining the operation, it is preferable to explain both cases, but since the difference between them is well known to those skilled in the art, the latter case will be mainly described. To do.

  1 to 4 are for explaining the first embodiment, and FIG. 1 is a plan view showing an initial state before photographing in the case of being adopted in a camera equipped with a solid-state imaging device. 2 is a cross-sectional view showing a part of FIG. 1 appropriately cut, FIG. 3 is an exploded perspective view, and FIG. 4 is a plan view showing a state immediately after the shutter blades are closed. is there. 5 to 7 are diagrams for explaining the second embodiment, FIG. 5 is a plan view showing a state immediately after the shutter blades are closed, and FIG. 6 is a part of FIG. FIG. 7 is a cross-sectional view shown by cutting appropriately, and FIG. 7 is an exploded perspective view.

  First, the configuration of the present embodiment will be described mainly with reference to FIG. The base plate 1 of the present embodiment is made of a synthetic resin and is a relatively thick member, and an opening 1a for a photographing optical path is formed substantially at the center. Further, two notches 1b and 1c are formed with the opening 1a therebetween, and similarly two escape holes 1d and 1e are formed. Furthermore, two blade shafts 1f and 1g, two rotation shafts 1h and 1i, and two attachment portions 1j and 1k are provided on one surface of the main plate 1 by integral molding. Among them, the blade shafts 1f and 1g are formed in a two-stage shaft composed of two shaft portions having different diameters as can be seen from the cross-sectional shape of the blade shaft 1f shown in FIG. Further, screw holes are formed in the front end surfaces of the attachment portions 1j and 1k.

  The permanent magnet rotors 2 and 3 are rotatably attached to the rotary shafts 1h and 1i. These permanent magnet rotors 2 and 3 are formed by mixing a magnetic material and a synthetic resin material (also referred to as a plastic magnet, a plastic magnet, etc.), and are arm portions 2a projecting in the radial direction. , 3a, output pins 2b, 3b are formed so as to be parallel to the rotation shafts 1h, 1i. Then, as can be seen from the permanent magnet rotor 2 shown in FIG. 2, the permanent magnet rotors 2 and 3 do not protrude the arm portions 2 a and 3 a from the opposite surface of the base plate 1, It is inserted into the escape holes 1d and 1e.

  The diaphragm blade 4 has a hole 4b and a long hole 4c in addition to the opening 4a for restricting the small-diameter diaphragm opening, and the hole 4b is formed in the blade shaft 1g with a large diameter shaft portion. The long hole 4c is fitted to the output pin 3b of the rotor 3. The shutter blade 5 has a hole 5a and a long hole 5b. The hole 5a is rotatably fitted to a shaft portion having a large diameter formed on the blade shaft 1f, and the long hole 5b. Is fitted to the output pin 2 b of the rotor 2.

In this way, after the diaphragm blade 4 and the shutter blade 5 are attached in order, an extremely thin partition plate 6 is attached to the blade shafts 1f and 1g. That is, the partition plate 6 has two holes 6b and 6c and two arc-shaped long holes 6d and 6e in addition to the opening 6a that restricts the exposure opening (large aperture stop). The holes 6b and 6c are fitted to shaft portions with small diameters formed in the blade shafts 1f and 1g, and the output pins 2b and 3b are passed through the long holes 6d and 6e. As described above, in this embodiment, the opening 6a regulates the exposure opening, and the opening 1a is formed to be much larger than that so that the unit is as close to the lens as possible. Can be arranged. However, when it is not necessary to do so, the diameter of the opening 1a may be made smaller than the opening 6a so that the opening 1a regulates the exposure opening.

  Finally, two stators with the same configuration are attached. First, one stator is composed of a bobbin member 7 made of synthetic resin, a coil 8 (not shown in FIG. 3), and two yokes 9 and 10 each having a substantially U shape. As shown in FIG. 3, the bobbin member 7 has a constricted winding part 7a and two holes 7b and 7c. A coil 8 is wound around the winding part 7a, and the hole 7b. Is fitted to the rotating shaft 1h. Further, the yokes 9 and 10 are opposed to the circumferential surface of the permanent magnet rotor 2 with the tip ends of the two leg portions as magnetic pole portions, and each one leg portion is set at the center of the winding portion 7a. It is inserted into the hollow portion formed in the above and attached to the bobbin member 7. The stator having such a configuration is, as described above, after the bobbin member 7 is positioned by the rotating shaft 1h, the screw 11 is inserted into the hole 7c, and is screwed to the attachment portion 1j. At this time, as can be seen from FIG. 2, the tip of the blade shaft 1f and the output pin 2b does not protrude upward from the bobbin member 7, and the tip of the rotating shaft 1h does not protrude. Further, a part of the coil 8 is in the notch 1b of the ground plane 1 and contributes to the thinning of the unit. 1 and 4, only the planar shape of the yoke 10 out of the two yokes 9 and 10 is shown.

  On the other hand, the other stator includes a bobbin member 12, a coil 13 (not shown in FIG. 3), and two yokes 14 and 15. In the bobbin member 12, the coil 13 is wound around the winding portion 12a, and the hole 12b is fitted to the rotating shaft 1i. Moreover, the yokes 14 and 15 are opposed to the circumferential surface of the permanent magnet rotor 3 with the tip ends of the two leg portions as magnetic pole portions, and one leg portion of each of the yokes 14 and 15 is hollow in the winding portion 12a. Inserted into the part. The stator is screwed to the mounting portion 1k by positioning the bobbin member 12 on the rotary shaft 1i and inserting the screw 16 into the hole 12c. At this time, the tip of the blade shaft 1g and the output pin 3b does not protrude upward from the bobbin member 7, and the tip of the rotating shaft 1i does not protrude. Further, a part of the coil 13 enters the notch 1c of the ground plane 1 and contributes to the thinning of the unit. 1 and 4, only a part of the planar shape of the yoke 14 is shown out of the two yokes 14 and 15.

  The two actuators configured as described above are generally current-controlled motors called moving magnet type motors, moving magnet motors, iris motors, and the like. Usually, the motor is magnetized in two poles in the radial direction and is rotated only in a predetermined angular range in a direction corresponding to the direction of the current supplied to the coils 8 and 13. Further, in this type of motor, if no current is supplied to the coils 8 and 13, the stop positions of the permanent magnet rotors 2 and 3 become unstable. It is well known that it can be stabilized by providing a member. In the case of the present embodiment, such a function is performed depending on the shape of the magnetic pole portions of the yokes 9, 10, 14, and 15. However, since it is not directly related to the present invention, detailed description thereof is omitted. In addition, the motor of the present embodiment has a flat shape suitable for thinning, but this type of motor has a plurality of different types of configurations in addition to the configuration of the present embodiment. Are known. Therefore, the actuator used as the drive source of the present invention is not limited to the motor configured as in this embodiment.

  Next, the operation of the present embodiment will be described. As already described, the present embodiment can also be adopted in a silver salt film camera, but in particular, a small digital still camera or a camera-equipped mobile phone. In the case of a camera with a built-in solid-state image pickup device, it will be described. FIG. 1 shows an initial state before photographing. At this time, the diaphragm blade 4 and the shutter blade 5 are retracted from the opening 6a, and the opening 6a that regulates the exposure opening is fully opened (large-diameter diaphragm opening control state), so that the solid-state imaging device is used. Is exposed to the subject light. Therefore, in this initial state, when the power is turned on, the subject image can be observed on the monitor. At this time, the coils 8 and 13 are not energized, but the stopped state of the rotors 2 and 3 is reliably maintained.

  When the release button is pressed at the time of shooting, first, based on the measurement result of the subject light, it is determined whether to shoot with the subject light amount reduced or not taken. If the subject light quantity is to be reduced for shooting, the aperture blade 4 is actuated first, and then the shutter blade is actuated. However, when taking pictures without reducing the subject light quantity, Only the shutter blade 5 is operated without operating the aperture blade 4. Therefore, in the explanation of the operation of the present embodiment, a case will be described in which both the blades 4 and 5 are actuated and photographing is performed while reducing the amount of subject light.

  In that case, first, a forward current is supplied to the coil 13. Thereby, the rotor 3 rotates clockwise, and the diaphragm blade 4 is rotated counterclockwise by the output pin 3b. Therefore, the diaphragm blade 4 enters the opening 6a, and when the center of the opening 4a reaches the center position of the opening 6a, the diaphragm blade 4 comes into contact with a stopper (not shown) and stops. Thereafter, the coil 13 may continue to be energized, but even if the energization is cut off for power saving, the rotor 3 is reliably maintained in a stopped state.

  In this way, when the operation of the aperture blade 4 is stopped, the charge accumulated in the solid-state image sensor is released by a signal from the exposure control circuit, and exposure for photographing is started. When a predetermined time elapses, a current in the reverse direction is supplied to the other coil 8 by a signal from the exposure control circuit. Thereby, the rotor 2 is rotated counterclockwise, and the shutter blade 5 is rotated clockwise by the output pin 2b. Therefore, the shutter blade 5 is made to enter the opening 6a, and immediately after closing the opening 4a, the shutter blade 5 comes into contact with a stopper (not shown) and stops. This state is the state shown in FIG.

  When the opening 4a is closed, the imaging information is transferred to the storage device in that state. When the transfer is completed, a forward current is supplied to the coil 8, contrary to the above case. Thereby, the rotor 2 is rotated in the clockwise direction, and the shutter blade 5 is rotated in the counterclockwise direction by the output pin 2b, so that the shutter blade 5 is retracted from the opening 6a. Then, immediately after retreating completely from the opening 6 a, when the abutting stop is brought into contact with a stopper (not shown), the coil 8 is deenergized.

  Thereafter, a reverse current is supplied to the coil 13, contrary to the above case. Thereby, the rotor 3 is rotated counterclockwise, and the aperture blade 4 is rotated clockwise by the output pin 3b. Therefore, the diaphragm blade 4 moves away from the opening 6a, and immediately stops the contact with a stopper (not shown) immediately after the opening 6a is fully opened. Thereafter, the state in which the coil 13 is de-energized is the initial state shown in FIG. In the above description, the return operation of the diaphragm blade 4 is started after the shutter blade 5 returns to the position shown in FIG. 1. If it is after closing the part 6a (namely, opening part 4a), it does not interfere even if it starts. In the case of the present embodiment, the diaphragm blade 4 and the shutter blade 5 do not collide during operation because they partially overlap in any operation state.

  As described above, the operation has been described in the case where it is adopted in a camera equipped with a solid-state imaging device, but here, the case where it is adopted in a silver salt film camera will be briefly described. In that case, in FIG. 1, the state where the shutter blade 5 has the opening 6a closed is the initial state. When the release button is pressed during shooting, if it is decided to shoot without reducing the amount of the subject light based on the measurement result of the subject light, the opening operation of the opening 6a on the shutter blade 5 is closed and closed. Only the operation is performed in order. However, when shooting is performed with the light amount of the subject light being reduced, the diaphragm blades 4 are first actuated to the state shown in FIG. The blade 5 is caused to perform an opening operation and a closing operation in order, and finally, the diaphragm blade 4 is retracted from the opening 6a.

  Next, the second embodiment will be described with reference to FIGS. 5 to 7. The difference between the first embodiment and the present embodiment is that in the case of the first embodiment, both the rotors 2 and 3 are the base plate 1. In the case of the present embodiment, it is attached to the bobbin members 7 and 12 separately. For this reason, the configuration of some members related to this point is different, but most of the configuration is the same as that of the first embodiment, and the operation is exactly the same as that of the first embodiment. Accordingly, in the following description, members and parts that are substantially the same as those of the first embodiment will be denoted by the same reference numerals, and different points will be mainly described.

  The base plate 1 of the present embodiment is not provided with the escape holes 1d and 1e and the rotation shafts 1h and 1i in the first embodiment. Instead, two holes 1m and 1n and two arc-shaped long holes 1p and 1q are formed, but the others are the same as in the first embodiment. The diaphragm blades 4, shutter blades 5 and partition plates 6 of the present embodiment have exactly the same shape as in the first embodiment, and are attached to the blade shafts 1f and 1g of the base plate 1 in the same manner. The permanent magnet rotors 2 and 3 of the present embodiment are substantially the same as those of the first embodiment, but the mounting method is different, and this will be described later.

  One stator is composed of a synthetic resin bobbin member 7, a coil 8, and yokes 9 and 10, but only the shape of the bobbin member 7 is different from that in the first embodiment. . That is, the bobbin member 7 of the present embodiment is not provided with the hole 7b in the first embodiment, but instead is provided with an escape hole 7d and a rotating shaft 7e. The rotor 2 is rotatably mounted so that the vertical relationship is reversed from the case of 1. The tip of the rotating shaft 7e is fitted into the hole 1m of the base plate 1, and the output pin 2b of the rotor 2 is a long hole 6d of the partition plate 6, a long hole 5b of the shutter blade 5, and a long hole 1p of the ground plate 1. Are inserted in this order. Further, such a stator is positioned with respect to the base plate 1 by the rotating shaft 7e of the bobbin member 7, and is screwed to the mounting portion 1j by screws 11. In the mounted state, a part of the coil 8 is in the notch 1b of the ground plate 1, but does not protrude from the opposite surface of the ground plate 1 together with the rotating shaft 7e and the tip of the output pin 2b. . Further, the arm 2a of the rotor 2 enters the escape hole 7d of the bobbin member 7, but does not protrude upward as shown in FIG.

  On the other hand, the other stator is different from the first embodiment only in the shape of the bobbin member 12, and is not provided with the hole 12b in the first embodiment. Instead, the escape hole 12d and the rotating shaft are provided. 12e is provided, and the rotor 3 is rotatably attached to the rotating shaft 12e with the vertical relationship reversed from that in the first embodiment. The tip of the rotating shaft 12e is fitted into the hole 1n of the base plate 1, and the output pin 3b of the rotor 3 includes the long hole 6e of the partition plate 6, the long hole 4c of the diaphragm blade 4, and the long hole 1q of the base plate 1. Are inserted in this order. The stator is positioned with respect to the base plate 1 by the rotating shaft 12e of the bobbin member 12, and is screwed to the mounting portion 1k by screws 16. And in the attachment state, although a part of coil 13 has entered into the notch 1c of the ground plane 1, it does not protrude to the surface on the opposite side of the ground plane 1 together with the rotating shaft 12e and the tip of the output pin 3b. . Further, the arm 3a of the rotor 3 enters the escape hole 12d of the bobbin member 12, but does not protrude upward. From this, the two output pins 2b and 3b in the present embodiment are both formed longer than in the case of the first embodiment.

  In each of the above embodiments, a current control type motor called a moving magnet type motor or the like is used as an actuator. However, when the actuator is used in a silver salt film camera or a digital still camera, the actuator is small. It is also possible to use a step motor or a DC motor. In each of the above embodiments, the shutter device and the diaphragm device are configured as one unit, but the present invention may be configured as separate units. In addition, if an ND filter plate is attached to the diaphragm blade 4 in each of the above embodiments so as to cover the opening 4a, it is possible to provide a filter device, and the present invention includes such a configuration. It can be used as a filter device.

  Furthermore, although the shutter device in each of the above embodiments employs a single shutter blade 5, the present invention employs a well-known pair of shutter blades that operate in opposite directions. There is no problem. The same applies to the diaphragm blades in the diaphragm device. In those cases, the two blades may be rotated in opposite directions or linearly operated in opposite directions.

It is the top view of Example 1 which showed the initial state before imaging | photography. It is sectional drawing which cut | disconnected and shown a part of FIG. 1 suitably. 1 is an exploded perspective view of Example 1. FIG. It is the top view of Example 1 which showed the state immediately after closure of a shutter blade | wing. It is the top view of Example 2 which showed the state immediately after closure of a shutter blade | wing. It is sectional drawing which cut | disconnected and showed a part of FIG. 3 is an exploded perspective view of Example 2. FIG.

Explanation of symbols

1 Ground plate 1a, 4a, 6a Opening 1b, 1c Notch shaft 1d, 1e, 7d, 12d Relief hole 1f, 1g Blade shaft 1h, 1i, 7e, 12e Rotating shaft 1j, 1k Mounting portion 1m, 1n, 4b, 5a , 6b, 6c, 7b, 7c hole 1p, 1q, 4c, 5b, 6d, 6e long hole 2,3 permanent magnet rotor 2a, 3a arm part 2b, 3b output pin 4 diaphragm blade 5 shutter blade 6 partition plate 7, 12 Bobbin member 7a, 12a Winding portion 8, 13 Coil 9, 10, 14, 15 Yoke 11, 16 Screw

Claims (7)

An imaging optical path opening that regulates the exposure aperture by either the ground plane having an imaging optical path opening or the imaging optical path opening is predetermined on one surface of the ground plane. A partition plate that is mounted with a gap therebetween, at least one blade that is disposed between the base plate and the partition plate and is rotatably attached to the base plate, and a side of the exposure opening a stator attached to said base plate and between the partition plate in position, the base plate in spaces without the partition plate between said stator and said base plate to a vertical center of rotation relative to the base plate camera blade, characterized in that it comprises a permanent magnet rotor for advancing and retracting the light opening more the vane to the output pin by provoking disposed in and reciprocally rotate through up to the stator from Drive.   At least one blade shaft is provided on the one surface of the base plate, the blade is rotatably attached to the blade shaft, and the partition plate is positioned by the blade shaft. The camera blade drive device according to claim 1.   The said stator consists of the bobbin member which wound the coil, and at least 1 yoke attached to this bobbin member, and this bobbin member is attached to the said ground plate. 3. A blade driving device for a camera according to 2. The permanent magnet rotor, the base plate or the optionally rotatably mounted on a rotary shaft provided on the bobbin member, the distal end portion of the rotary shaft, the role of positioning when mounted to said base plate of said stator The camera blade driving device according to claim 3, wherein the camera blade driving device is provided. The permanent magnet rotor is rotatably attached to a rotating shaft provided on the base plate or the bobbin member, and a part thereof exists in a recess formed in the bobbin member around the rotating shaft. camera blade drive device according to claim 3 or 4, characterized in that as is. 6. The blade drive for a camera according to claim 3, wherein the base plate has a notch and receives the coil so as not to protrude into the other surface. apparatus. The camera blade drive device according to any one of claims 1 to 6, wherein another set of the blade, the stator, and the rotor is provided.