JP4334337B2 - Camera blade drive - Google Patents

Description

  The present invention relates to a camera blade drive device in which blade members 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 blade members that are reciprocated by an actuator. In many cases, the lens shutter device has two blade members, but in the case of a camera having a small lens diameter, there are also one having a single blade member. In addition, in the case of a diaphragm device used in a camera having a small lens diameter, a single blade member having a small circular opening is provided, and the opening is advanced and retracted in the photographing optical path as necessary. There is a lot going on.

  Further, in the case of the filter device, one blade member has a shape similar to that of the above-described diaphragm device (however, the opening is substantially the same as the photographing optical path regulating opening formed on the base plate). In some cases, the ND filter plate is attached with an adhesive so as to cover the opening in the vicinity of the opening, but without attaching the ND filter plate, While preparing two blade members of the above shape and covering the opening between them, the blade member manufactured only with the ND filter plate is polymerized, and the three blade members are simultaneously in the same direction. It is also possible to reciprocate by the same angle.

  On the other hand, recently, cameras are becoming smaller and thinner, and in the case of a camera using a solid-state imaging device, it has been built in a portable information terminal device such as a mobile phone or a PDA. . However, in the case of a portable information terminal device with a camera, there is a problem that the camera configuration becomes large, so that a device equipped with the shutter device or the aperture device as described above has not yet been realized. . For this reason, shutter devices and diaphragm devices can be used not only for silver salt film cameras and digital cameras that have been used so far, but also for portable information terminal devices with cameras. There is a demand for further downsizing and thinning.

  By the way, in order to reduce the size and thickness of each device as described above, it is necessary to further reduce the size of the blade member and make the actuator small and thin. As for actuators, there are limitations and it is not easy to do so. For this reason, of course, on the one hand, such efforts are repeated, but on the other hand, an effort is made to devise how to attach the actuator to the ground plane so that the size of the ground plane can be as small as possible.

And in patent document 1, when attaching an actuator (motor) to a base plate (shutter base plate) at two places, one is attached with a screw, but the other is a hook portion provided on the base plate without using a screw. A shutter device that does not provide a mounting surface with screws and does not need to increase the size of the base plate (shutter base plate), and reduces the number of screw parts to reduce the cost by attaching with (saddle part). It is disclosed.
JP 2002-315294 A

  By the way, in order to make it possible to employ each device as described above in a portable information terminal device with a camera, it is not only necessary to make the blade member and the actuator small. Since the blade member is generally operated between the lenses constituting the photographing lens, in order to reduce the thickness of the portable information terminal device with a camera, the photographing lens is configured as a blade chamber. However, in order to do so, the ground plate and the cover plate must be made as thin as possible. However, in the case of a base plate, it is usually made of a synthetic resin, and since an actuator, a blade member, a cover plate, and the like must be attached, it has to be formed relatively thick. For this reason, it is necessary to keep the mounting portions at a predetermined thickness and to form a relatively large area facing the photographic lens so that there is no problem even if the blade member slides. It is extremely difficult. Moreover, since each apparatus as described above is assembled by an operator, the smaller the size, the higher the manufacturing cost. For this reason, it is necessary to reduce the number of components by increasing the number of functions of the structural members, or to make assembly as simple as possible and easy to disassemble.

  The present invention has been made to solve such problems. The object of the present invention is to provide a structure in which the photographing lens can be brought close to the ground plate without contacting the ground plate, and the shape of the cover plate is devised. Thus, it is an object to provide a camera blade driving device that is easy to assemble and disassemble, and that can be attached to an actuator with respect to a ground plane, and that is suitable for reducing the size, thickness, and cost of a camera.

  In order to achieve the above object, the blade driving device for a camera of the present invention includes a base plate made of a synthetic resin having an opening to avoid contact with a photographing lens, and a base plate made of a thin metal plate. Are manufactured with substantially the same outer shape, and are attached to the main plate at a predetermined interval. A plurality of protrusions are formed on the main plate side, and a tip is provided at a predetermined position of the outer edge. A cover plate on which at least one bent portion having a hook portion is formed, and a circular optical path regulating opening made of a thin metal plate material, which is smaller than the opening and centered on the optical axis A diameter regulating plate which is positioned on the base plate and pressed against the base plate by the projecting portion to form a blade chamber between the cover plate and the blade plate, and is disposed in the blade chamber To be able to rotate on the main plate A blade member, and a plurality of mounting portions, which are disposed on a surface of the base plate opposite to the aperture regulating plate side for reciprocating rotation of the blade member. And an actuator attached to the main plate by engaging at least one with the hook portion.

  In that case, the actuator may have two attachment portions, and one attachment portion may be attached to the base plate by a screw, or the aperture restriction plate may have a plurality of holes. In addition, the positioning may be performed by fitting them to a plurality of positioning pins provided on the base plate.

  The camera blade drive device of the present invention does not have an opening for restricting the optical path on the base plate made of synthetic resin, and forms a large opening to avoid contact with the photographing lens, so that the camera configuration can be made thin. become. In addition, the metal aperture regulating plate having the optical path regulating opening is not fixed to the base plate, but is simply pressed by the cover plate, so that assembly and disassembly operations are facilitated, which is advantageous in terms of cost. Further, since the actuator is attached at least at one place by the hook portion of the cover plate without using a screw, it is not necessary to increase the shape of the ground plate, which is advantageous for downsizing and cost reduction. Furthermore, the metal cover plate is advantageous in reducing the number of parts because it is configured with the blade chamber, the aperture restriction plate, and the actuator.

  Embodiments of the present invention will be described with reference to the illustrated examples. The embodiment is configured as a camera shutter device built in a mobile phone. FIG. 1 is a plan view thereof, and FIG. 2 is a cross-sectional view of the main part of FIG. As described above, by replacing the shutter blade with a diaphragm blade or a filter blade, a diaphragm device or a filter device can be obtained. In addition, these devices can be applied not only to mobile phones and other information terminal devices with cameras, but also to conventional silver halide film cameras and digital cameras.

  First, the configuration of this embodiment will be described. The base plate 1 is made of synthetic resin, and a circular opening 1a is formed so that the center is at the optical axis position. The opening 1a is for preventing the base plate 1 from touching the photographing lens even when a photographing lens (not shown) is disposed close to the shutter device of the present embodiment when the shutter device of the present embodiment is disposed in the camera. Thus, a part of the photographing lens can be inserted into the opening 1a within the range of the thickness of the base plate 1. Therefore, if such an object is achieved, the opening 1a is not necessarily circular. Further, as shown in FIG. 1, a shaft 1b is provided on the surface side of the main plate 1, and a shaft 1c, two positioning pins 1d, 1e, two stoppers 1f, 1 g is provided. Furthermore, although two attachment parts are provided in the back side of the ground plate 1, one attachment part 1h of them is shown by FIG.

  The aperture restricting plate 2 is made of a thin metal plate and is not clearly shown. However, the outer shape is substantially the same as that of the ground plate 1, and the two mounting portions described above (only one mounting portion 1h is shown). Only the position of is escaped. The aperture restriction plate 2 is formed with a circular opening 2a so that the center is the optical axis position. The opening 2a is considerably smaller in diameter than the opening 1a of the base plate 1, The optical path of photographing light is regulated. The aperture restriction plate 2 has two holes 2b and 2c, which are detachably fitted to the positioning pins 1d and 1e. Further, although not explicitly shown, the aperture restricting plate 2 is formed with a circular hole and an arc-shaped long hole, and as can be seen from FIG. 2, the shaft 1c has the circular hole. It penetrates. Further, a motor output pin 12b, which will be described later, is inserted into the arc-shaped elongated hole.

  The cover plate 3 is made of a thin metal plate material and is not clearly shown. However, the outer shape is substantially the same as that of the ground plate 1, and the above-described two mounting portions (only one mounting portion 1h is shown) The blade chamber is configured by being attached with screws 4 and 5 and providing a predetermined space between the aperture regulating plate. In the case of the present embodiment, although not denoted, an opening having the same shape as the opening 1a is formed in the cover plate 3 so that the center is the optical axis position. . However, in the case of the opening, it may be larger than the opening 2a for restricting the diameter, and the size is not particularly meaningful.

  The cover plate 3 is formed with four protruding portions 3a, 3b, 3c, 3d and one bent portion 3e on the ground plate 1 side. Among them, the four projecting portions 3 a, 3 b, 3 c, and 3 d press the above-mentioned diameter regulating plate 2 to the ground plate 1. Therefore, if the cover plate 3 is removed from the main plate 1, the aperture restriction plate 2 can be easily removed from the main plate 1. Further, the bent portion 3e formed on the outer edge of the cover plate 3 has a length that the tip of the bent portion 3e reaches to the opposite side of the base plate 1, and a square hole 3f as a hook portion is formed at the tip. However, the bent portion 3e has flexibility in terms of its material. Further, the cover plate 3 is formed with a circular hole 3g (see FIG. 2) and an arc-shaped long hole 3h (see FIG. 2). The hole 3g has a tip of the shaft 1c. And an output pin 12b of a motor to be described later is inserted into the long hole 3h.

  The shutter blade 6 is disposed in the blade chamber, and a circular hole is rotatably fitted to the shaft 1c. The shutter blade 6 has a long hole 6a as is well known. In this embodiment, only one shutter blade is provided as described above. However, as is apparent from FIG. 1, the shutter blade has two well-known configurations, and they are simultaneously rotated in opposite directions. Even if it is constituted, the layout design is made so that the main plate 1 does not need to be enlarged. It is also easy to selectively manufacture a shutter device having only one shutter blade as in this embodiment and a shutter device having two shutter blades.

  In FIG. 1, an actuator for reciprocatingly rotating the shutter blade 6 is attached to the surface side of the base plate 1. This actuator is a current control type motor called a moving magnet type motor, etc., and the permanent magnet rotor reciprocates only within a predetermined angle range in accordance with the direction of energization of the stator coil. It is a rotating motor. Since the present invention is not directly related to the configuration of such a motor, it cannot be said that the detailed configuration can be understood. However, the following description will be made within the range shown in the drawings. I will do it.

  First, the stator includes a stator frame 7, a coil 8, and two yokes 9 and 10. In addition to the hole 7 a for fitting the tip of the shaft 1 b of the base plate 1, the stator frame 7 is provided with two attachment portions. One of the attachment portions is a screw hole. The other attachment portion is an engagement portion 7b and is latched in the hole 3f of the bent portion 3e. As can be seen from FIG. 1, in the case of this embodiment, there is no place that can be screwed at the left position of the stator frame 7. In order to perform screwing, both the stator frame 7 and the base plate 1 need to protrude leftward. However, doing so increases the size of the device and requires screws. Therefore, in the case of the present embodiment, such a configuration is adopted. Further, if a plurality of such mounting structures are provided on the right side or the lower right side of the stator frame 7, the screws 11 can be dispensed with.

  The stator frame 7 attached in this way has a cylindrical bobbin portion 7b, and a coil 8 is wound around the outer periphery thereof. Further, the yokes 9 and 10 each having two legs are overlapped, and one leg of each is inserted into the hollow part of the bobbin part 7b, and the tip of each of the two legs is connected to the magnetic pole of the stator. As a part. And although these yokes 9 and 10 are not indicated clearly, position control is carried out by the shape of the hollow part formed in the ground plate 1, etc. Further, although the individual shapes of the yokes 9 and 10 are not clearly shown, the leg portion inserted into the bobbin portion 7b has the same shape, but the one not inserted into the bobbin portion 7b. As is well known in this type of motor, when the coil 8 is in a non-energized state, the leg 12 has a shape that favorably maintains a stopped state of the rotor 12 described later.

  Next, the rotor 12 is rotatably attached to the shaft 1b of the main plate 1, and the magnetic pole portions of the yokes 9 and 10 are arranged so as to face the circumferential surface thereof. Further, the rotor 12 is made of a permanent magnet that is magnetized in two poles in the radial direction. At the tip of the arm portion 12a that projects in the radial direction, there is a rotating shaft (axis 1b) of the rotor 12. Output pins 12b are formed so as to be parallel. And the output pin 12b has penetrated the circular arc long hole 1i (refer FIG. 2) formed in the base plate 1, and the circular arc long hole which is formed in the aperture restriction board 2, The blade chamber 6 is fitted into the long hole 6 a of the shutter blade 6, and the tip thereof is inserted into the arc-shaped long hole 3 h of the cover plate 3.

  Next, the operation of this embodiment will be described. FIG. 1 shows an initial state of the present embodiment, and the shutter blade 6 fully opens the opening 2a. Therefore, the solid-state image sensor is exposed to subject light, and the subject image can be observed on a monitor. At this time, the coil 8 of the motor is not energized, but as is well known, the rotor 12 is rotated clockwise by the magnetic attractive force acting between the rotor 12 and the yokes 9 and 10. The power to do is given. Therefore, the shutter blade 6 is given a force that rotates clockwise by the output pin 12b, and is kept in contact with the stopper 1g.

  When the release button is pressed during shooting, the charge accumulated in the solid-state imaging device is released, and exposure for shooting starts. When a predetermined time elapses, a current is supplied to the coil 8 in the positive direction by a signal from the exposure control circuit, and the rotor 12 is rotated counterclockwise. For this reason, the shutter blade 6 rotates counterclockwise, closes the opening 2a, and then stops with the front end abutting against the stopper 1f. When the opening 2a is closed in this way, the imaging information is transferred to the storage device in that state. When the transfer is completed, a current is supplied to the motor coil 8 in the opposite direction to the above case. Therefore, the rotor 12 rotates clockwise and causes the shutter blade 6 to open. Thereafter, when the shutter blade 6 fully opens the opening 2a and stops by contacting the stopper 1g, the power supply to the coil 8 is cut off, and the initial state of FIG. 1 is restored.

  In addition, although an Example is comprised so that it could incorporate suitably in the mobile phone with a camera as mentioned above, it is applied also to other information terminal devices with a camera, a digital camera, and a silver salt film camera. Needless to say, you can. However, when applied to a silver salt film camera, the shutter blades are often configured in two pieces, and the initial state is a closed state of the optical path regulating opening. In the embodiment, a moving magnet type motor is used as the actuator. However, since various types of configurations are known for this type of motor, any configuration may be adopted. However, other electromagnetic driving devices such as a step motor may be employed.

  In addition, the embodiment is an example when the present invention is configured as a shutter device, but the present invention may be a diaphragm device or a filter device. That is, as an example of the diaphragm device, a shutter blade 6 of the embodiment may be formed as a diaphragm blade by forming a circular opening smaller than the opening 2a, or a filter device. As an example, a filter blade may be formed by forming an opening of an appropriate size in the shutter blade 6 of the embodiment and attaching an ND filter plate so as to cover the opening. It is done. Furthermore, two blades such as the above-described diaphragm blades are prepared, and a blade manufactured only by the ND filter plate is sandwiched between them, so that a three-layer filter blade can be considered.

It is a top view of an Example. It is principal part sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plate 1a, 2a Opening part 1b, 1c Shaft 1d, 1e Positioning pin 1f, 1g Stopper 1h Mounting part 1i, 3h Long hole 2 Aperture control board 2b, 2c, 3f, 3g, 7a Hole 3 Cover board 3a, 3b, 3c 3d Protruding part 3e Bending part 4, 5, 11 Screw 6 Shutter blade 7 Stator frame 7b Engaging part 7c Bobbin part 8 Coil 9, 10 Yoke 12 Rotor 12a Arm part 12b Output pin

Claims (3)

  In order to avoid contact with the photographing lens, a synthetic resin ground plate having an opening and a metal thin plate material are manufactured in substantially the same outer shape as the ground plate, and have a predetermined distance from the ground plate. A cover plate which is attached in a space and has a plurality of protrusions formed on the base plate side and at least one bent portion having a hook portion at the tip at a predetermined position of the outer edge; The base plate is made of a thin metal plate and has a circular optical path regulating opening that is smaller than the opening and centered on the optical axis, and is positioned on the base plate and then is projected by the protrusion. A diameter regulating plate that is pressed against the cover plate and forms a blade chamber, a blade member that is disposed in the blade chamber and is rotatably attached to the base plate, and a plurality of mounting portions Have the vane part The actuator is disposed on the surface of the base plate opposite to the aperture regulating plate side and is attached to the base plate by engaging at least one of the mounting portions with the hook portion. And a blade drive device for a camera.   2. The blade driving device for a camera according to claim 1, wherein the actuator has two attachment portions, and one attachment portion is attached to the base plate by a screw.   The said aperture restriction board has a some hole, It is positioned by making them fit in the some positioning pin provided in the said ground plate, The Claim 1 or 2 characterized by the above-mentioned. Camera blade drive device.