JP5230111B2 - Camera blade drive - Google Patents

Description

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

  A lens shutter device (hereinafter referred to as a shutter device), a diaphragm device, a filter device, and a lens barrier device adopted in recent cameras each have one or a plurality of blades, which are reciprocated by an electromagnetic actuator. It is made to operate. As is well known, these devices may be unitized independently, but two or three may be configured as one unit.

  In general, the shutter device is one in which two shutter blades are reciprocally rotated in opposite directions at the same time, but in some cases, one shutter blade is reciprocally rotated. There is also. In addition, at least one of the two shutter blades that are simultaneously reciprocally rotated in opposite directions is constituted by two divided blades, and the divided blades are sufficiently overlapped when fully opened. It is also known to reduce the size of the apparatus by reducing the space for accommodating the blades. It is also known that the shutter device configured as described above can be used as a lens barrier device by arranging the blades on the front surface of the photographing lens.

  In addition, as a diaphragm device, conventionally, a diaphragm ring is used and a plurality of diaphragm blades are reciprocally rotated in the same direction at the same time. However, a cellular phone, a PDA (PERSONAL DIGITAL ASSISTANT), etc. In recent small digital cameras including a camera for incorporating an information terminal device, one in which a single aperture blade having a small circular opening is reciprocally rotated is generally used. Further, as a recent filter device, a filter blade is usually formed by covering an opening formed in the one diaphragm blade with an ND filter plate.

  Furthermore, a step motor may be used as the electromagnetic actuator, but when the apparatus is small, it is common to use a current control type electromagnetic actuator. In this electromagnetic actuator, a rotor made of a permanent magnet is rotated in a direction corresponding to the direction of current supply to the stator coil, and the blade is reciprocated by its output pin. Can be roughly divided into two types depending on the difference in the structure of the stator. In the first type, the stator coil is wound around the outer side of the stator frame accommodating the rotor so as to surround the two bearing portions of the rotor. In the type, the stator coil is wound around a substantially U-shaped yoke. The second type of electromagnetic actuator is suitable for reducing the thickness of the entire apparatus.

  The present invention relates to a blade drive device for a camera that employs a second type of electromagnetic actuator among the current control type electromagnetic actuators described above. An actuator is employed, and a shutter device and a diaphragm device are configured as one unit.

JP 2005-156616 A

  By the way, the blade drive device described in Patent Document 1 has the following configuration (the description in parentheses is the name and code of the member used in Patent Document 1). A vane chamber is formed between the base plate (base plate 1) and the partition plate (partition plate 6) made of a thin material, and the partition plate (partition plate 6) is interposed at a side position of the exposure opening. Cover frames (bobbin members 7 and 12) are attached to the main plate (base plate 1). The yoke (yoke 9, 10, 14, 15) is arranged between the partition plate (partition plate 6) and the cover frame (bobbin members 7, 12), but the permanent magnet rotor (permanent magnet rotor). 2, 3) are arranged between the main plate (base plate 1) and the cover frame (bobbin members 7, 12). Such an arrangement is advantageous for reducing the size and thickness of the blade driving device, so that it can be used not only for a single camera, but also for a camera built in an information terminal device such as a mobile phone or a PDA, a vehicle-mounted camera, etc. It is extremely suitable for use.

  However, even though such an arrangement is suitable for reducing the thickness of the device, it is not necessarily preferable when it is intended to reduce the size of the device by reducing the area of the main plate (ground plate 1). Absent. The permanent magnet rotor (permanent magnet rotors 2 and 3) is disposed between the main plate (base plate 1) and the cover frame (bobbin members 7 and 12), so that the area of the main plate (base plate 1) is reduced. Attempts to prevent the blades (aperture blades 4, shutter blades 5) from interfering with the permanent magnet rotors (permanent magnet rotors 2, 3) during operation require that the blades (aperture blades 4, shutters). This is because it is necessary to devise the mounting position and shape of the blade 5), and the design becomes troublesome. In particular, when the number of blades is three or more and the accommodation area of the blades when fully opened is further reduced, the influence of such a problem is increased.

  The present invention has been made in order to solve such problems. The object of the present invention is to suitably arrange the permanent magnet rotor between the cover frame and the thin partition plate so that the shape of the ground plane is as follows. Of course, it is an object to provide a blade driving device for a camera, which has a degree of freedom in designing the mounting position and shape of the blades and is suitable for reduction in thickness and size.

In order to achieve the above object, a camera blade driving device according to the present invention is provided for a photographing optical path that regulates an exposure opening by at least one of a base plate having a photographing optical path opening and the opening. A partition plate which has an opening and is attached to one surface of the base plate and forms a vane chamber with the base plate; and the partition plate is interposed at one lateral position of the exposure opening. in the ground plate Te, the provided for one tangential opening is attached to the base plate so as to cover a peripheral region extending in one edge portion of該地plate from a position spaced a predetermined distance or more, between the partition wall plate a cover frame constituting the actuator chamber, located on the actuator chamber, rotatably mounted relative to the axis of the rotor for being erected on the partition plate side of the cover frame, Output that rotates integrally A permanent magnet rotor that faces the blade chamber, and one leg portion that is substantially U-shaped and that faces the circumferential surface of the rotor with the tip portions of the two leg portions as magnetic pole portions. a yoke are fitted the bobbin wound with a coil in the are arranged in the blade chamber, standing on the partition plate side of the cover frame for extraordinary look and said rotor to said blade chamber optionally rotatably attached to the shaft of the vanes located axially and coaxially, a first blade which is caused to advance and retreat in the exposure opening by the output pin is disposed in the vane chamber, wherein The cover frame is erected on the partition plate side, faces the blade chamber and is rotatably attached to at least one blade shaft located on a different axis from the rotor shaft, Advancing and retracting to the exposure opening by output pin A second blade comprising at least one is, so that has a.

In this case, when the tip of the rotor shaft faces the blade chamber and serves also as the blade shaft located on the same axis as the rotor shaft , a plurality of blades When it is provided, the design becomes easy, which is advantageous for downsizing of the apparatus. Further, the bobbin is formed integrally with the cover frame, or the cover frame has a notch, and a part of the bobbin and a part of the coil are arranged in the notch. If this is done, it is advantageous for making the device thinner.

Their to, camera blade driving device of the present invention, miniaturization, since it is possible to thin, as a device for controlling the amount of light received by the solid-state imaging device adopts the internal camera to various devices Since it is advantageous, an information terminal device such as a mobile phone or PDA incorporating the device, an in-vehicle camera, and the like also belong to the present invention.

  The blade drive device for a camera according to the present invention can be attached to the base plate after the permanent magnet rotor, the partition plate, and the blade are assembled in order with respect to the shaft erected on the cover frame. Therefore, the assembly work can be suitably performed, and since the permanent magnet rotor is supported by the cover frame and the thin partition plate, the degree of freedom in the design of the mounting position and shape of the blades is increased even if the base plate is made small, This is particularly advantageous when it is desired to increase the number of blades to make the ground plane smaller.

  The embodiment of the present invention will be described with reference to two illustrated examples. The present invention can be applied to various digital cameras and silver salt film cameras as long as they are small cameras. Further, as described above, the shutter device, the diaphragm device, and the filter device may be configured as individual units, or a plurality of them may be configured as one unit. Both of the two embodiments are configured so as to be applicable to a camera of an information terminal device such as a mobile phone. In the first embodiment, only the shutter device is configured as a unit, and in the second embodiment, the shutter device and the diaphragm device are configured as one unit. 1 to 5 are for explaining the first embodiment, and FIGS. 6 to 9 are for explaining the second embodiment.

  Example 1 will be described with reference to FIGS. First, the configuration of the present embodiment will be described mainly with reference to FIG. 1 and FIG. The base plate 1 of the present embodiment is made of a synthetic resin and is a relatively thick member, and forms a circular photographing optical path opening 1a. The base plate 1 has five mounting shafts 1b, 1c, 1d, 1e, and 1f, three stopper pins 1g, 1h, 1i, and positioning pins 1j provided on one surface by integral molding. In addition, as shown in FIG. 3C, a long hole 1k that does not pass through and three holes 1m, 1n, and 1p that do not pass through are provided. Further, a thick portion 1q (see FIG. 3C) is formed at a portion where the positioning pin 1j is erected. On the other hand, the other surface has a planar shape with no protrusions.

  The partition wall plate 2 is formed in a very thin plate shape, forms a blade chamber between itself and the base plate 1, and has a circular opening 2 a for the photographing optical path at a position overlapping the opening 1 a of the base plate 1. have. In this embodiment, the opening 1a and the opening 2a have substantially the same diameter, and the exposure opening is regulated by both of them. However, the exposure opening can be reduced by reducing the diameter of one of the openings. In practice, the exposure opening is often restricted by the opening 2a. The partition plate 2 has holes 2b, 2c, 2d, 2e, and 2f for fitting the mounting shafts 1b, 1c, 1d, 1e, and 1f, and a notch portion for escaping the tip of the stopper pin 1g. 2g, holes 2h and 2i for fitting the tips of the stopper pins 1h and 1i, and a relatively large hole 2k for fitting the thick portion 1q are formed. A long hole 2j having substantially the same shape is formed at the corresponding position, and three holes (not shown) having substantially the same shape are also formed at positions corresponding to the holes 1m, 1n, and 1p.

  The cover frame 3 is made of a synthetic resin and has a complicated shape, and an actuator chamber is formed between the cover frame 3 and the partition plate 2 at a side position of the exposure openings (openings 1a and 2a). A bobbin portion 3a having a hollow portion 3j is formed at substantially the center in the length direction of the cover frame 3, and a coil 4 is wound around the bobbin portion 3a. Are wound around the pins 3b and 3c provided upright. The cover frame 3 is provided with three holes 3d, 3e, 3f. As can be seen from the mounting shaft 1b shown in FIG. 3 (c), the two mounting shafts 1b and 1c are each composed of two shaft portions having different diameters. A small-diameter shaft portion formed on the distal end side of the mounting shafts 1b and 1c is fitted. The positioning pin 1j is loosely fitted in the hole 3e. Further, three shafts 3g, 3h, 3i are erected on the partition plate 2 side of the cover frame 3. Among them, as can be seen from FIG. 3C, the shaft 3 g is composed of two shaft portions having different diameters, and the shaft portion on the tip side having a small diameter is a hole (reference numeral). None) and the tip is inserted into the hole 1 n of the main plate 1. Further, the shafts 3h and 3i pass through holes (not shown) formed in the partition plate 2, and the tips thereof are inserted into the holes 1m and 1p of the ground plate 1, respectively.

  The permanent magnet rotor 5 is disposed in the actuator chamber and is rotatably attached to a shaft portion having a large diameter among the shafts 3g. The permanent magnet rotor 5 is formed by mixing a magnetic material and a synthetic resin material, and the tip of the arm portion 5a projecting in the radial direction is parallel to the shaft 3g, An output pin 5 b is formed, and the output pin 5 b passes through the long hole 2 j of the partition plate 2 and the tip thereof is inserted into the long hole 1 k of the ground plate 1. As is well known, the cylindrical portion of the permanent magnet rotor 5 is magnetized in two poles in the radial direction. The permanent magnet rotor 5 of the present embodiment has such a configuration, but as is well known (see, for example, Japanese Patent Application Laid-Open No. 2005-241866), only the cylindrical portion is made of a permanent magnet, and the arm Also known is one in which the portion 5a and the output pin 5c are integrally formed of synthetic resin. The permanent magnet rotor of the present invention includes those configured as described above.

  The yoke 6 of the present embodiment is substantially U-shaped, the tip of two legs is a magnetic pole, and is opposed to the circumferential surface so as to sandwich the permanent magnet rotor 5, and one leg is The hollow portion 3j formed at the center of the bobbin portion 3a is inserted. The yoke 6 has a hole 6a in which the positioning pin 1j is fitted.

  In the case of this embodiment, three shutter blades 7, 8, 9 are arranged in the blade chamber. The shutter blade 7 arranged closest to the partition plate 2 is rotatably attached to the shaft 3h, and the output pin 5b is fitted into the long hole 7a. The shutter blade 8 disposed in the middle is rotatably attached to the shaft 3g, and the output pin 5b is fitted in the long hole 8a. The shutter blade 9 disposed on the first base plate 1 side is rotatably attached to the shaft 3i, and the output pin 5b is fitted in the long hole 9a.

  Here, how to assemble the shutter device having such a configuration will be described mainly with reference to FIGS. FIG. 2A shows the cover frame 3 around which the coil 4 has already been wound. In the case of the present embodiment, the cover frame 3 around which the coil 4 is wound in this way is placed in an upside-down state on a dedicated jig, and the other constituent members are placed upward (see FIG. 2A). Assemble one after another from the bottom. First, the yoke 6 is assembled. In this case, one leg portion of the yoke 6 is inserted into the hollow portion 3j formed in the bobbin portion 3a, and the hole 6a of the yoke 6 is positioned at the position of the hole 3e of the cover frame 3. Match. The state is shown in FIG. 2 and 3, the yoke 6 is shown with the illustration of the tip (magnetic pole part) of the leg part inserted into the hollow part of the bobbin part 3a omitted.

  Next, as shown in FIG. 2C, the permanent magnet rotor 5 is assembled to the shaft 3 g of the cover frame 3. After that, as shown in FIG. 3 (a), three holes formed in the partition plate 2 and not labeled are fitted to the shafts 3g, 3h, 3i, and the long holes 2j are connected to the output pins 5b. To fit. At this time, the hole formed in the partition plate 2 and fitted to the shaft 3g (not indicated) has a diameter that can be fitted only to a shaft portion having a small diameter of the shaft 3g. The partition plate 2 is received by a stepped surface of the shaft 3g and serves to prevent the permanent magnet rotor 5 from coming off. Thereafter, the holes formed in the three shutter blades 7, 8, 9 and not labeled are sequentially fitted to the shafts 3h, 3g, 3i, and the long holes 7a, 8a, 9a are connected to the output pins 5b. When it is fitted, the state shown in FIG.

  After the shutter blades 7, 8 and 9 are assembled in this way, finally, the partition plate 2 and the cover frame 3 are attached to the base plate 1. In that case, the thick portion 1q of the base plate 1 is fitted into the hole 2k formed in the partition plate 2, and the positioning pin 1j is fitted into the hole 6a of the yoke 6 and the hole 3e of the cover frame 3. At the same time, the stopper pins 1h, 1i are fitted into the holes 2h, 2i of the partition plate 2. At the same time, the shaft portion having a small diameter formed on the front end side of the mounting shafts 1b and 1c is fitted into the holes 3d and 3f of the cover frame 3, and the mounting shafts 1d, 1e and 1f are inserted into the holes 2d and 2d of the partition plate 2. 2e and 2f are fitted. Thereby, the tips of the shafts 3g, 3h, 3i of the cover frame 3 were inserted into the holes 1n, 1m, 1p formed in the base plate 1 and the tips of the output pins 5b were formed in the base plate 1. It will be in the state inserted in the long hole 1k which has not penetrated.

  By the way, as described above, when the mounting shafts 1b and 1c are fitted into the holes 3d and 3f of the cover frame 3, the tips of the mounting shafts 1b and 1c protrude through the holes 3d and 3f. It has become. When the mounting shafts 1d, 1e, 1f are fitted into the holes 2d, 2e, 2f of the partition plate 2, the tips of the mounting shafts 1d, 1e, 1f also protrude through the holes 2d, 2e, 2f. It is in the state. In FIG.3 (c), the tip shape of the attachment shafts 1b and 1e at that time is shown with the dashed-dotted line. In this embodiment, in this state, the tip of each mounting shaft 1b, 1c, 1d, 1e, 1f is thermally melted and deformed into a bowl shape, so that the partition plate 2 and the cover frame 3 are made to the base plate 1. It is attached. FIG. 3C shows the shutter device assembled in this way.

  FIG. 3C shows the imaging module A incorporated in the camera together with the shutter blade driving device of this embodiment. This imaging module A includes a photographing lens G and a solid-state imaging device C inside, and is arranged with the opening A1 approaching the partition plate 2. In the case of the present embodiment, the imaging module A is disposed behind the blade driving device. However, it goes without saying that the blade driving device of the present embodiment may be disposed between the solid-state imaging device C and the photographing lens G. The same applies to the blade driving device of Example 2 described later.

  Thus, the shutter device of this embodiment has a configuration suitable for miniaturization and thinning. For this reason, this shutter device can be employed in various cameras, but is particularly configured to be easily employed in a camera for a mobile phone. FIGS. 5A to 5C show an example in which the shutter device according to the present embodiment is arranged in a mobile phone when the shutter device is employed in a mobile phone camera. 5 (a) is a front view when the mobile phone is not used, FIG. 5 (b) is a left side view of FIG. 5 (a), and FIG. 5 (c) is a front view when used. It is. As can be seen from these drawings, the shutter device S of the present embodiment can be arranged at any position of the mobile phone as required.

  Next, the operation of this embodiment will be described. FIG. 1 shows an initial state (photographing standby state) before photographing. At this time, the shutter blades 7, 8, and 9 fully open the exposure openings (openings 1a and 2a), and expose the solid-state imaging device C to the subject light. Therefore, in this initial state, since the power is already turned on, the photographer can observe the subject image on the monitor. At this time, the coil 4 is not energized, but as is well known, a magnetic attractive force acts between the magnetic pole of the permanent magnet rotor 5 and the magnetic pole part of the yoke 6, and the permanent magnet A force that rotates counterclockwise is applied to the rotor 5. However, since the shutter blade 7 is in contact with the stopper pin 1h and the shutter blade 8 is in contact with the stopper pin 1g, the permanent magnet rotor 5 cannot rotate, and the stop state shown in FIG. It is reliably maintained.

  When the release button of the camera is pressed during shooting, the charge accumulated in the solid-state imaging device is released by a signal from the exposure control circuit, and exposure for shooting starts. When a predetermined time elapses, a current is supplied to the coil 4 in the positive direction by a signal from the exposure control circuit. Thereby, the permanent magnet rotor 5 is rotated clockwise, the shutter blade 7 is rotated counterclockwise by the output pin 5b, and the shutter blades 8 and 9 are rotated clockwise, thereby opening the opening 2a (exposure). At this time, since the distance from the output pin 5b to the shaft 3g is shorter than the distance from the output pin 5b to the shaft 3i, the shutter blade 8 rotates faster than the shutter blade 9 Will go. When the shutter blades 7, 8, 9 close the opening 3a, immediately after that, the shutter blade 8 abuts against the stopper pin 2i, so that the permanent magnet rotor 5 and the shutter blades 7, 8, 9 rotate. Stop. This state is the state shown in FIG. 4, and at this time, the overlapping amount of the shutter blades 8 and 9 is minimized.

  When the opening 2a is closed, the imaging information is transferred to the storage device in that state. When the transfer ends, a current is supplied to the coil 4 in the opposite direction, contrary to the above case. As a result, the permanent magnet rotor 5 is rotated counterclockwise, the shutter pin 7 is rotated clockwise by the output pin 5b, and the shutter blades 8 and 9 are rotated counterclockwise to open the exposure opening. However, in the process, the overlapping amount of the shutter blades 8 and 9 increases. Immediately after the opening 2a is fully opened, the shutter blade 7 comes into contact with the stopper pin 1h and the shutter blade 8 comes into contact with the stopper pin 1g, so that the permanent magnet rotor 5 and the shutter blades 7, 8, 9 The rotation is stopped. Thereafter, when the power supply to the coil 4 is cut off, the initial position (photographing standby state) shown in FIG. 1 is restored.

  By the way, as described above, the shutter blades 8 and 9 are simultaneously rotated in the same direction to change the overlapping amount during operation. Therefore, considering the case where the shutter blades 8 and 9 in the state of FIG. 4 are one shutter blade, when the exposure opening is fully opened, a part of the opening direction of the shutter blade that is one sheet is opened. However, it will come out of the blade chamber to the left in FIG. As can be seen from the above, in the case of the present embodiment, by using three shutter blades, the area of the base plate 1 can be reduced, and the overall size of the shutter device can be reduced.

  However, the shutter device of the present embodiment is not only reduced in size by using three shutter blades, but is further reduced in size for another reason. As can be seen from FIGS. 1 and 4, a part of the shutter blades 7, 8, 9 can be arranged so as to overlap the permanent magnet rotor 5. If the permanent magnet rotor 5 is disposed between the base plate 1 and the cover frame 3, the three shutter blades 7, 8, and 9 are preferably used unless the base plate 1 is made larger than the present embodiment. Can not be placed. Further, if it is attempted to arrange the base plate 1 without enlarging it, for example, the arm portion 5a of the permanent magnet rotor 5 must be lengthened, or the outer shape of the shutter blades 7, 8, 9 must be made special. As a result, the degree of freedom in design is greatly impaired and machining becomes difficult. And, as described in Patent Document 1, this means that even when the shutter blades are configured as one sheet, the shutter blades 8 and 9 in the present embodiment are configured as one and two shutter blades are configured. The same can be said for the case.

  Furthermore, since the present invention is based on the premise that a blade chamber is formed between the partition plate 2 made of a very thin plate material and the ground plate 1 as in this embodiment, the partition plate 2 has a shaft. Cannot be erected. Therefore, conventionally, the shafts 3g, 3h, and 3i for assembling the shutter blades 7, 8, and 9 are erected on the main plate 1. If configured in this manner, the shafts 3g, 3h, and 3i are arranged at the final stage of assembly work. When the cover frame 3 is attached to the base plate 1, since a plurality of members are attached to both the base plate 1 and the cover frame 3, the assembling work of both is very troublesome. However, according to the configuration of the present embodiment, the cover frame 3 in which all members other than the base plate 1 are assembled and the ground plate 1 in which nothing is assembled are assembled to each other. Become.

  In the present embodiment, both the permanent magnet rotor 5 and the shutter blade 8 are assembled to the shaft 3g standing on the cover frame 3. However, in the present invention, the shutter blade 8 is covered with the cover. There is no problem even if it is assembled to a dedicated shaft erected on the frame 3. However, in that case, since the partition plate 2 is a thin plate member and serves to prevent the permanent magnet rotor 5 from coming off, the tip of the shaft 3g protrudes into the blade chamber without any measures. There is a possibility that. And if it protrudes into the blade chamber, it is necessary to prevent the shutter blade from colliding during operation. Therefore, the configuration of this embodiment is superior.

  In the present embodiment, the bobbin portion 3a is provided in the cover frame 3. However, the cover frame of the present invention is not limited to such a configuration, and the bobbin portion 3a is a member independent of the cover frame 3. It does not matter. Such a configuration is shown as a modification in FIG. In the case of this modification, holes 31d and 31f corresponding to the holes 3d and 3f are formed in the cover frame 31, and a notch 31k is formed. The bobbin 32 around which the coil 4 is wound has pins 32b and 32c corresponding to the pins 3b and 3c. When the cover frame 31 is attached to the main plate 1, the bobbin 32 and a part of the coil 4 enter the notch 31k.

  In the above description of the operation, the shutter device according to the present embodiment is described in the case where the shutter device is used in a digital camera. However, in the case where the shutter device is used in a silver salt film camera, the state shown in FIG. When shooting, the shutter blades 7, 8, and 9 are fully opened as shown in FIG. 1 and then returned to the state shown in FIG.

Furthermore, although the shutter blade of the present embodiment has a configuration of three sheets, the present invention may have a configuration of two shutter blades . The shutter device thus configured can be used as it is as a lens barrier device. Further, the shutter blade root, by forming a small circular opening than the exposure opening, to be employed as a throttle device, by attaching the ND filter plate to the small openings, it becomes possible to employ a filter device . Therefore, the present invention is applied to all these apparatuses.

  Next, Example 2 will be described with reference to FIGS. In this embodiment, the shutter device and the diaphragm device are configured as one unit. The configuration of the shutter device is substantially the same as that in the first embodiment. Therefore, constituent members of the shutter device are denoted by the same reference numerals as those in the first embodiment, and detailed descriptions thereof are omitted. However, the ground plate and the partition plate in the present embodiment are different from those in the first embodiment. Therefore, the description of the configuration of the present embodiment will be mainly performed on the ground plate, the partition plate, and the diaphragm device.

  The base plate 11 of the present embodiment is made of a synthetic resin and forms a circular photographing optical path opening 11a. The base plate 11 is integrally formed on one surface with six mounting shafts 11b, 11c, 11d, 11e, 11f, and 11g, five stopper pins 11h, 11i, 11j, 11k, and 11m, and two positioning pins. 11n and 11p are erected, and as shown in FIG. 10 in which FIG. 9D is enlarged, two long holes 11q and 11r that do not penetrate and five holes that do not penetrate 11s, 11t, 11u, 11v, and 11w are provided. Further, thick portions 11x and 11y (see FIG. 10) are formed at portions where the positioning pins 11n and 11p are erected.

  As shown in FIG. 10, an intermediate plate 12 and a partition plate 13 are disposed above the base plate 11. A first blade chamber is formed between the base plate 11 and the intermediate plate 12, and a second blade chamber is formed between the intermediate plate 12 and the partition plate 13. Further, the intermediate plate 12 of this embodiment is made of a material thinner than the partition plate 13. For this reason, in FIG. 10, the cross section cannot be clearly shown, and is shown by a thick line. Further, the planar shape of the intermediate plate 12 is exactly the same as the planar shape of the partition plate 13 shown in FIG. 7 including the positions and shapes of holes and the like formed therein. Therefore, only the planar shape of the partition plate 13 will be described below.

  The partition plate 13 according to the present embodiment has a photographing optical path opening 13 a having the same diameter at a position overlapping the opening 11 a of the base plate 11. Therefore, in the case of the present embodiment, the exposure opening is regulated by the three of the openings 11a and 13a and the opening of the intermediate plate 12. However, also in this embodiment, the diameter of the opening 13a of the partition plate 13 may be made smaller than the diameters of the other two openings, and the exposure opening may be restricted only by the opening 13a. The partition plate 13 is provided with holes 13b, 13c, 13d, 13e, 13f, and 13g for fitting the mounting shafts 11b, 11c, 11d, 11e, 11f, and 11g and the tip of the stopper pin 11k. Recessed notch 13h, holes 13i, 13j, 13k, 13m for fitting the tips of the stopper pins 11h, 11i, 11j, 11m, and the relatively thick two for fitting the thick portions 11x, 11y. In addition to the two holes 12q and 13r, two long holes 13n and 13p having substantially the same shape are formed at positions corresponding to the long holes 11q and 11r, and the holes 11s, 11t, 11u, Five holes (not shown) having substantially the same shape are also formed at positions corresponding to 11v and 11w.

  As described above, the shutter device according to the present embodiment has substantially the same configuration as the shutter device described in the first embodiment. Therefore, in each drawing, the same reference numerals as those in the first embodiment are given to the actuator of the shutter device and the three shutter blades. However, in FIGS. 7 and 11, the long holes 7a. No reference numerals are assigned to 8a and 9a. In the case of this embodiment, the three shutter blades 7, 8, 9 are arranged in a blade chamber formed between the main plate 11 and the intermediate plate 12. The shape of the tip of the shutter blade 8 is different from that in the first embodiment.

  Next, the configuration of the actuator and diaphragm blades of the diaphragm device will be described. First, the configuration of the actuator is exactly the same as the configuration of the actuator of the shutter device. Therefore, a brief description will be given. The cover frame 14 constitutes an actuator chamber between the partition plate 13 and the cover frame 14. A coil 15 is wound around a bobbin portion 14a of the cover frame 14, and both ends thereof are wound around pins 14b and 14c. As can be seen from the mounting shaft 11e shown in FIG. 10, the mounting shafts 11e and 11f of the main plate 11 are composed of two shaft portions having different diameters and are formed on the tip side of the shafts having a small diameter. The portions are fitted in the holes 14d and 14f of the cover frame 14, respectively. The positioning pin 11p is fitted in the hole 14e of the cover plate 14. Two shafts 14g and 14h are erected on the partition plate 13 side of the cover frame 14. Of these, as can be seen from FIG. 10, the shaft 14 g is composed of two shaft portions having different diameters, and the shaft portion on the distal end side having a small diameter is a hole formed in the partition plate 13 and the intermediate plate 12 ( The front end of the base plate 11 is inserted into the hole 11w. Further, the shaft 14 h passes through holes (not shown) formed in the partition plate 13 and the intermediate plate 12, and the tip thereof is inserted into the hole 1 v of the base plate 11.

  The permanent magnet rotor 16 is rotatably attached to a shaft portion having a large diameter among the shafts 14g. The permanent magnet rotor 16 is formed with an arm portion 16a and an output pin 16b. The output pin 16b passes through a long hole 13p of the partition plate 13 and a long hole (not indicated) of the intermediate plate 12. The tip is inserted into the long hole 11r of the main plate 11. The cylindrical portion of the permanent magnet rotor 16 is magnetized in two poles in the radial direction.

  The yoke 17 having a substantially U-shape is opposed to the circumferential surface of the permanent magnet rotor 16 with the tip ends of two legs as magnetic poles, and one leg is formed at the center of the bobbin portion 14a. Inserted into the hollow portion 14i. As shown in FIG. 9, the yoke 17 is formed with a hole 17a, into which the positioning pin 11p is fitted.

  A diaphragm blade 18 is disposed in a blade chamber formed between the intermediate plate 12 and the partition plate 13. The aperture blade 18 of the present embodiment has an opening 18a having a diameter smaller than that of the opening 13a, and is rotatably attached to the shaft 14h of the cover frame 14. Further, the aperture blade 18 is formed with a long hole 18c into which the output pin 16b of the permanent magnet rotor 16 is inserted.

  The method of assembling the blade driving device of the present embodiment having such a configuration is similar to the method of assembling the shutter device of the first embodiment. Therefore, the assembly method will be described mainly with reference to FIGS. FIG. 8A shows two cover frames 3 and 14 around which the coils 4 and 15 are wound. Two such cover frames 3 and 14 are placed upside down on a dedicated jig, and the other components are assembled in order from above (downward in FIG. 8A). First, the yokes 6 and 17 are inserted at their leg portions into the hollow portions 3j and 14i of the bobbin portions 3a and 14a, and the holes 6a and 17a are aligned with the positions of the holes 3e and 14e of the cover frames 3 and 14, respectively. This state is shown in FIG. Then, as shown in FIG. 8C, after the permanent magnet rotors 5 and 16 are assembled to the shafts 3g and 14g of the cover frames 3 and 14, as shown in FIG. The five holes formed in the partition plate 13 and having no reference numerals are fitted to the shafts 3g, 3h, 3i of the cover plate 3 and the shafts 14g, 14h of the cover frame 14, and the long holes 13n, 13p are formed into the rotor. The output pins 5b and 16b of 5 and 16 are fitted.

  Next, as shown in FIG. 9 (a), a hole formed in the aperture blade 18 and not labeled is fitted to the shaft 14h of the cover frame 14, and the long hole 18c is made permanent. The magnet rotor 16 is fitted to the output pin 16b. Thereafter, as shown in FIG. 9 (b), the five holes formed in the intermediate plate 12 and having no reference numerals are connected to the shafts 3g, 3h, 3i of the cover plate 3 and the shaft 14g of the cover frame 14. , 14h, and two long holes, which are also not labeled, are fitted to the output pins 5b, 16b of the permanent magnet rotors 5, 16. Next, the holes formed in the three shutter blades 7, 8, 9 and not labeled are fitted in order to the shafts 3h, 3g, 3i, and the long holes 7a, 8a, 9a are connected to the output pins. When fitted to 5b, the state shown in FIG. 9C is obtained.

  Then, after assembling the base plate 11, the two cover frames 3 and 14 are attached to the base plate 11. First, when assembling the base plate 11, the thick portions 11x and 11y of the base plate 11 are fitted into the holes 13q and 13r formed in the intermediate plate 12 and the partition plate 13, and one positioning pin 11n is installed. The hole 6a of the yoke 6 and the hole 3e of the cover frame 3 are fitted, and the other positioning pin 11p is fitted to the hole 17a of the yoke 17 and the hole 14e of the cover frame 14, and the stopper pins 11h, 11i, 11j. , 11m are fitted into the four holes formed in the intermediate plate 12 and not labeled, and the holes 13i, 13j, 13k, 13m of the partition plate 13. At the same time, a small diameter shaft portion formed on the front end side of the mounting shafts 11b and 11c is fitted into the holes 3d and 3f of the one cover frame 3, and formed on the front end side of the mounting shafts 11e and 11f. The shaft portion having a small diameter is fitted into the holes 14d and 14f of the other cover frame 14, and the mounting shafts 11d and 11g are formed on the intermediate plate 12 with two holes and the partition plate 13 which are not labeled. The holes 13d and 13g are fitted. Thereby, the tips of the shafts 3g, 3h, 3i, 14g, and 14h of the two cover frames 3 and 14 are inserted into the holes 11t, 11s, 11u, 11w, and 11v of the main plate 11, and the two permanent magnet rotors 5 and 5 are inserted. The tips of the 16 output pins 5b and 16b are inserted into the long holes 11q and 11r of the main plate 11, respectively.

  Thus, in the state in which the ground plane 11 is assembled, the tips of the mounting shafts 11b, 11c, 11e, and 11f protrude through the holes 3d, 3f, 14d, and 14f of the cover frames 3 and 14. Thus, the tips of the mounting shafts 11d and 11g protrude through the holes 13d and 13g of the partition plate 13. Therefore, finally, the two cover frames 3 and 14 are attached to the main plate 11 by thermally melting the tips of the attachment shafts 11b, 11c, 11d, 11e, 11f, and 11g and deforming them into a bowl shape. FIG. 9D shows a state in which the two cover frames 3 and 14 are attached to the main plate 11 as described above. FIG. 10 showing an enlarged view of FIG. 9 (d) shows an imaging module A incorporating a solid-state imaging device C and a photographing lens, as in the case of FIG. 3 (c).

  Next, the operation of this embodiment will be described. The state shown in FIG. 7 is a state in which the power supply of the camera is turned on but the coils 4 and 15 of the two actuators are not energized. At this time, a force that rotates counterclockwise is applied to the permanent magnet rotor 5, and a force that rotates clockwise is applied to the permanent magnet rotor 16. Therefore, the driving pin 5c gives a force that rotates the shutter blade 7 clockwise, and the shutter blades 8 and 9 receive a force that rotates counterclockwise. , 11h, and this state is maintained. Further, the diaphragm blade 18 is applied with a force that rotates counterclockwise, but is in contact with the stopper 11k and is maintained in this state. Therefore, in this state, the opening 13a (exposure opening) is fully open so that the subject image can be observed by the liquid crystal display device.

  When the release button is pressed during photographing, the subject light is first measured by the photometry device, and when the subject light is relatively dark, only the shutter device is operated in substantially the same manner as in the first embodiment. When the subject light is relatively bright, the diaphragm device is first activated and then the shutter device is activated. In any case, the operation of the shutter device is the same. Therefore, in the following description of the operation, only the latter case will be described in order to avoid duplication.

  First, in order to operate the diaphragm blade 18, a current is supplied to the coil 15 in the reverse direction. Therefore, the permanent magnet rotor 16 is rotated counterclockwise, and the diaphragm blade 18 is rotated clockwise by the output pin 16b. Therefore, the diaphragm blade 18 enters the opening 13a, but the rotation of the permanent magnet rotor 16 and the diaphragm blade 18 is stopped when the diaphragm blade 18 contacts the stopper 11m. As a result, the amount of light received by the solid-state image sensor C is controlled and reduced. Even when the aperture blade 18 of this embodiment is a filter blade by covering the opening 18a with an ND filter sheet, the amount of light received by the solid-state image sensor C can be controlled as in this embodiment. It becomes possible.

  Next, in this state, the charges accumulated in the solid-state image sensor are released. Thereby, exposure for photographing is started, and new charges are accumulated. When a predetermined time controlled by the exposure time control circuit elapses, a current is supplied to the coil 4 in the positive direction by the end signal. Therefore, the permanent magnet rotor 5 is rotated clockwise, and the shutter blades 7, 8, and 9 are rotated by the output pin 5b. Then, when the opening 18a of the aperture blade 18 is closed, immediately after that, the shutter blade 8 abuts against the stopper 11j, whereby the rotation of the permanent magnet rotor 5 and the shutter blades 7, 8, 9 is stopped. FIG. 11 shows the stop state.

  When the state shown in FIG. 11 is reached, the imaging information accumulated in the solid-state imaging device is transferred to the storage device. When the imaging information is completed, a reverse current is supplied to the coil 4 and the coil 15 is positive. Directional current is supplied. Therefore, one permanent magnet rotor 5 is rotated counterclockwise, causing the shutter blades 7, 8, and 9 to open. When the shutter blades 7, 8, 9 fully open the opening 13a, immediately after that, the shutter blades 7, 8 abut against the stoppers 11i, 11h, so that the permanent magnet rotor 5 and the shutter blades 7, 8, 9 is stopped. On the other hand, when a positive current is supplied to the coil 4, the permanent magnet rotor 16 is rotated in the clockwise direction, and the diaphragm blade 18 is rotated in the counterclockwise direction. Then, when the diaphragm blade 18 completely retracts from the opening 13a and contacts the stopper 11k, the rotation of the permanent magnet rotor 16 and the diaphragm blade 18 is stopped. Thereafter, when the energization of the coils 4 and 15 is cut off, the state shown in FIG. 7 is obtained, and the next photographing is prepared.

  In this embodiment, the shutter device and the diaphragm device are configured as one unit, and the shutter blades and the diaphragm blades are arranged in separate blade chambers. However, the present invention is not limited to such an arrangement. For example, Japanese Patent Application Laid-Open No. 2003-5251 describes a configuration in which shutter blades and aperture blades are arranged in one blade chamber, and a configuration in which shutter blades and filter blades are arranged. The present invention may be configured as such, or the diaphragm blade and the filter blade may be arranged in one blade chamber. Japanese Patent Laid-Open No. 2002-139765 has two blade chambers with an intermediate plate as a boundary, a shutter blade in one blade chamber, and a diaphragm blade in the other blade chamber; Although a configuration in which shutter blades are disposed in one blade chamber and filter blades are disposed in the other blade chamber is described, the present invention may be configured as such, There may be a configuration in which the blades are arranged and the filter blades are arranged in the other blade chamber. Furthermore, in JP 2001-188275 A, two blade chambers are configured with an intermediate plate as a boundary, a shutter blade is disposed in one blade chamber, and a diaphragm blade and a filter blade are disposed in the other blade chamber. Although the configuration is described, the present invention may be configured as such.

  Further, the camera blade driving device of each of the above embodiments has been described on the assumption that it is used in a camera of an information terminal device such as a mobile phone. However, the camera blade driving device of the present invention is reduced in size, Since the configuration is suitable for thinning, for example, as a blade drive device in an in-vehicle camera unit such as a camera for visual recognition behind a vehicle, a sensing camera used in a road lane recognition system, an obstacle detection system, etc. Can be used. And since the blade | wing drive device of this invention can control and control the light-receiving amount of a solid-state image sensor, it is advantageous when it employ | adopts for those vehicle-mounted cameras.

It is the top view of Example 1 which showed the state just before imaging | photography. FIGS. 2A and 2B are cross-sectional views for explaining an assembly process according to the first embodiment. FIG. 2A shows a cover frame around which a coil is wound, and FIG. 2B shows a yoke assembled to the cover frame. FIG. 2C shows a state in which a permanent magnet rotor is assembled to the cover frame. FIG. 3C is a cross-sectional view for explaining the assembly process after FIG. 2C, in which FIG. 3A shows a state in which the partition plate is assembled to the cover frame, and FIG. FIG. 3C shows the state where the shutter blades are assembled to the frame, and FIG. 3C shows the state where the cover frame is finally attached to the main plate. It is the top view of Example 1 which showed the state immediately after completion | finish of imaging | photography. FIGS. 5A and 5B are diagrams illustrating an example of a cellular phone in which the shutter device of Example 1 is incorporated, in which FIG. 5A is a front view when not in use, and FIG. 5B is a left side of FIG. FIG. 5C is a front view in use. FIG. 6 is an exploded perspective view showing a modification of the first embodiment. It is the top view of Example 2 which showed the state just before imaging | photography. FIG. 8A is a cross-sectional view for explaining an assembly process of the second embodiment, and FIG. 8A shows two cover frames each wound with a coil, and FIG. 8B shows two cover frames. 8 (c) shows a state where the yokes are assembled to each other, FIG. 8 (c) shows a state where the permanent magnet rotors are assembled to the two cover frames, and FIG. 8 (d) shows two covers. The state which attached the partition plate to the frame is shown. FIG. 9D is a cross-sectional view for explaining the assembly process after FIG. 8D, in which FIG. 9A shows a state in which one aperture blade is assembled to one cover frame. (B) shows a state in which the intermediate plate is assembled to the two cover frames, and FIG. 9 (c) shows a state in which the three cover blades are assembled to the other cover frame. 9 (d) shows a state in which two cover frames are finally attached to the main plate. FIG. 10D is a cross-sectional view showing FIG. It is the top view of Example 2 which showed the state immediately after completion | finish of imaging | photography.

Explanation of symbols

1,11 Ground plate 1a, 2a, 11a, 13a, 18a Opening 1b-1f, 11b-11g Mounting shaft 1g-1i, 11h-11k, 11m Stopper pin 1j, 11n, 11p Positioning pin 1k, 2j, 7a, 8a, 9a, 11q, 11r, 13n, 13p, 18c Long hole 1m, 1n, 1p, 2b-2f, 2h, 2i, 2k, 3d-3f, 6a, 11s-11w, 13b-13g, 13i-13k, 13m, 13q , 13r, 14d to 14f, 17a, 31d, 31f Hole 1q, 11x, 11y Thick part 2, 13 Partition plate 2g, 13h Notch part 3, 14, 31 Cover frame 3a, 14a Bobbin part 3b, 3c, 14b, 14c, 32b, 32c Pin 3g-3i, 14g, 14h Shaft 3j, 14i Hollow part 4, 15 Coil 5, 16 Permanent magnet rotor 5 a, 16a Arm portion 5b, 16b Output pin 6, 17 Yoke 7, 8, 9 Shutter blade 18 Aperture blade 31k Notch 32 Bobbin A Imaging module A1 Aperture C Solid-state imaging device G Imaging lens S Shutter device

Claims (4)

A main plate having an opening for a photographing optical path;
A partition plate that has an opening for a photographing optical path that regulates an exposure opening by at least one of the openings and that is attached to one surface of the base plate and constitutes a blade chamber between the base plate,
Cover a peripheral region from one position of the base plate to a side of one end of the base plate from a position separated by a predetermined distance or more with respect to one tangent line of the opening in the base plate with the partition plate in between at one side position of the exposure opening. is attached to the base plate as a cover frame constituting the actuator chamber between said partition plate,
Be arranged in the actuator chamber, wherein the rotatably mounted with respect to the axis of the rotor for being erected on the partition plate side of the cover frame, the vane chamber output pin that rotates integrally A permanent magnet rotor facing
A yoke that is substantially U-shaped and has a tip portion of its two leg portions opposed to the peripheral surface of the rotor as a magnetic pole portion, and a bobbin around which a coil is wound is fitted on one leg portion; ,
Wherein it is arranged in the blade chamber, rotatable with respect to the axis of the vanes located axially and coaxially for the partition plate is erected on the side extraordinary look and said rotor to said vane chamber of the cover frame attached to the, a first blade which is caused to advance and retreat in the exposure opening by the output pin,
With respect to at least one blade shaft that is arranged in the blade chamber, stands on the partition plate side of the cover frame, faces the blade chamber, and is located on an axis different from the rotor shaft. A second blade comprising at least one blade that is rotatably mounted and is advanced and retracted to and from the exposure opening by the output pin;
A blade drive device for a camera, comprising: The tip of the shaft for the rotor faces the blade chamber, and doubles as a shaft for the blade located on the same axis as the shaft for the rotor . Camera blade drive device.   The camera blade driving device according to claim 1, wherein the bobbin is integrally formed with the cover frame.   3. The camera blade according to claim 1, wherein the cover frame has a notch, and a part of the bobbin and a part of the coil are disposed in the notch. 4. Drive device.

Images