JP2006308677A - Blade driving device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade driving device for a camera which enables a motor to be surely attached to the base plate of a shutter device or the like. <P>SOLUTION: A first stator frame 5 and a second stator frame 6 constituting a stator frame include a permanent magnet rotor 4 inside through a bearing, and a coil 7 is wound round the outside of the first and the second stator frames 5 and 6 so as to surround the bearing part, then a yoke 9 is fit to the outside of the coil 7. A tapered surface 6d is formed on the second stator frame 6. The yoke 9 has two attaching pieces 9b and 9c, which are pressed to be bent in an inside radial direction and inserted in holes 1f and 1g formed on the base plate 1, and thereafter by releasing the pressing force, the attaching pieces 9b and 9c are restored to original form by restoring force due to their own elasticity, and hook parts 9b-3 and 9c-2 at their edges are engaged with the edges of the holes 1f and 1g. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camera blade drive device in which blade members such as shutter blades, aperture blades, and filter blades are driven by a motor.

  In cameras for information terminal devices including mobile phones and small shutter devices, diaphragm devices, filter devices, etc. used in compact cameras, the blade member is directly or indirectly by an output pin integrated with the rotor of the motor. Many are configured to reciprocate. In many cases, the shutter device has two shutter blades and reciprocates them in opposite directions. However, the shutter device is adopted for a camera having a very small lens diameter such as a camera for a mobile phone. Some shutter devices have a single shutter blade. In the case of two shutter blades, there are a shutter blade that is rotated and a shutter blade that is operated linearly. It is also known that the configuration of these shutter devices can be a photographic lens barrier device.

  In addition, in the case of an aperture device used in a small camera, recently, it is provided exclusively for the purpose of light quantity control, and the demand for cost reduction is extremely large. The number of aperture blades that simultaneously rotate in the same direction so that a plurality of substantially circular aperture openings can be regulated is decreasing. Instead, for video cameras, two aperture blades are used in a reciprocal manner. Many still cameras are operated in a straight line, and for still cameras, many aperture blades with small circular apertures are rotated to advance and retract the exposure aperture. It has become. Also known is a diaphragm blade having a small circular opening which is operated linearly.

  Further, in the case of a filter device, the opening of a member having a shape similar to that of the diaphragm blade having the circular opening described above (however, the opening may be approximately the same size as the exposure opening). Many filter blades are attached by attaching an ND filter plate so as to cover the opening in the vicinity of the portion. However, in some cases, two members having such a circular opening are prepared, and a member manufactured only with the ND filter plate is overlapped between them, and the three members are combined into one blade. In this way, it is conceivable that the reciprocating operation is simultaneously performed, and it is also known that one filter blade is manufactured only by the ND filter plate.

  Among such devices, the shutter device, the diaphragm device, and the filter device may be unitized independently, but two or more of them may be configured as one unit.

  In addition, each of the above-described blade members has recently been reciprocated by a motor. As one of those motors, a current control type motor known as a moving magnet type motor is known. It has been. A feature of this motor is that it is easier to miniaturize at a lower cost than a stepping motor, and a rotor having a permanent magnet that is magnetized in the radial direction (often in the case of two poles) is parallel to its rotational axis. It has one or two output pins (also called drive pins) extended in such a manner that it can be rotated only within a predetermined rotation angle range in a direction corresponding to the energization direction to the stator coil. Yes. The rotor of this type of motor may be made of a permanent magnet together with the main body portion of the rotor having a substantially cylindrical shape, or may be made of a synthetic resin integrally formed with the main body portion. Sometimes it is said.

  On the other hand, as a stator of this type of motor, various configurations are known, but as a typical configuration among them, a rotor is supported in a housing chamber configured by two stator frame members, It has been known for a long time that a coil is wound on the outside of the stator frame so as to surround two bearing portions, and a cylindrical yoke is fitted on the outside of the coil. And, by changing the shape of the yoke, the configuration in which the motor unit can be attached to and detached from the base plate of each device as described above without requiring a dedicated mounting member is described in the following patent document. 1.

JP 2003-215653 A

  The present invention relates to a blade driving device for a camera in which a stator is a current-controlled motor having a typical configuration as described above, and the above-described various blade members are reciprocated. By the way, the configuration described in Patent Document 1 is such that the motor can be attached to the main plate only with an attachment piece (bending piece) formed on the yoke. The cost can be reduced as compared with the case of using and mounting, and it is extremely effective. However, the demands for downsizing of these types of devices have become even greater recently, and in addition to miniaturization of the motor itself, the plane shape and thickness of the ground plane must be reduced as much as possible. is there.

  Therefore, when viewed from such a viewpoint, the configuration described in Patent Document 1 has several problems because the yoke must be rotated when the motor is attached to the main plate. That is, in the case of a motor, just because a reduction in size is required does not mean that the driving force may be reduced. Therefore, as part of the miniaturization of the motor, if the outer shape of the stator frame is reduced, when the yoke is rotated, it becomes easier for the yoke to come into contact with the coil wound in the concave groove outside the stator frame, There is a possibility that the coil may be damaged, and there is a problem that the mounting work must be carefully performed. In addition, the configuration described in Patent Document 1 requires that the mounting piece (bending piece) can be moved by a predetermined rotation angle when the motor is attached / detached. Elongated slits and insertion holes are formed including unnecessary parts. For this reason, if the ground plate is made thin, a predetermined strength cannot be obtained at the mounting portion, and there is a problem that it is difficult to mount the motor in a predetermined posture by being deformed at the time of mounting.

  The present invention has been made to solve such problems, and the object of the present invention is that a moving magnet type motor can be easily attached to and detached from a ground plate such as a shutter device or an aperture device, It is an object to provide a blade driving device for a camera having a motor mounting structure that is excellent in space efficiency of the mounting portion and can be manufactured at a low cost and that is extremely effective in reducing the size of the device.

  In order to achieve the above object, a camera blade driving device according to the present invention comprises a housing chamber provided with a closed wall at both ends of a cylindrical shape by two frame members, and a bearing portion is provided on each closed wall. And a stator frame formed with a series of concave grooves so as to surround the two bearing portions on the outer surface, a coil wound in the concave grooves, and a permanent magnet. A rotor that is supported by the bearing portion and is reciprocally rotated in a predetermined rotation angle range in a direction corresponding to a direction of energization of the coil, and at least the rotor is integral with the rotor and protrudes outside One output pin, a cylindrical portion, and a plurality of mounting pieces projecting from the cylindrical portion and having flexibility in the radial direction of the cylindrical portion, and the cylindrical portion is an outer periphery of the stator frame The mounting piece is fitted to the surface and extends to the tip extending parallel to the rotation axis. A yoke having a hook portion bent in a radial direction, an opening for photographing optical path, a long hole through which the output pin is operably penetrated, and a tip portion of the mounting piece are individually provided. A base plate having a plurality of mounting holes penetrating through the yoke, and the yoke deflects the mounting piece in an inner radial direction and inserts the hook portion into the mounting hole. The hook portion is engaged with the base plate using the restoring force of the mounting piece.

  In this case, the stator frame and the ground plate may be provided with a plurality of positioning pins on one of them and a plurality of positioning holes on which the positioning pins are fitted. And you may make it the attachment state of the said stator frame with respect to the said baseplate being controlled only by engagement with at least two of the said attachment holes, and the said attachment piece.

  In the present invention, when the motor configured as described above is attached to the main plate, the yoke is not rotated with respect to the stator frame, unlike the attachment configuration described in Patent Document 1, so that the outer side of the stator frame. There is no risk of damaging the coil being wound, and the mounting operation can be performed very easily. In addition, the mounting hole formed in the base plate for the mounting may be a size that allows the minimum mounting piece of the yoke to be inserted from the vertical direction of the base plate, so even if the thickness of the base plate is reduced, It is possible to sufficiently maintain the strength of the mounting portion. In addition, like the mounting configuration described in Patent Document 1, the mounting portion is also excellent in space efficiency and can be manufactured at low cost.

  The embodiment of the present invention will be described with reference to two illustrated examples. In these embodiments, the aperture device and the shutter device are configured as one unit, and are generally referred to as a shutter with an aperture. However, the diaphragm blades and the shutter blades have a known shape, and the connection configuration between these blades and the output pins (drive pins) of the respective motors is also a known configuration. Therefore, those details are not shown in the drawings, and only a brief description thereof will be given. 1 to 4 are for explaining the first embodiment, and FIG. 5 is for explaining the second embodiment.

  Example 1 is demonstrated using FIGS. 1-4. FIG. 1 is a plan view seen from the object side when incorporated in the camera, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is a yoke shown in FIGS. FIG. 4 is a cross-sectional view showing a state immediately before the motor is attached to the main plate. As can be seen from FIG. 2, the shutter with a diaphragm of the present embodiment includes a base plate 1, an intermediate plate 2, and an auxiliary base plate 3 arranged at a predetermined interval from the subject side. A plurality of screws are attached to the main plate 1 from the auxiliary main plate 3 side. A space between the base plate 1 and the intermediate plate 2 is used as a blade chamber for shutter blades, and a space between the intermediate plate 2 and the auxiliary base plate 3 is used as a blade chamber for diaphragm blades. However, as is well known, both the shutter blades and the diaphragm blades are arranged in one blade chamber constituted by the ground plate 1 and the auxiliary ground plate 3 without partitioning the ground plate 1 and the auxiliary ground plate 3 by the intermediate plate 2. It doesn't matter if you do.

  The intermediate plate 2 and the auxiliary ground plate 3 have substantially the same shape as the planar shape of the ground plate 1 shown in FIG. The base plate 1, the intermediate plate 2 and the auxiliary base plate 3 have a circular opening concentrically formed at a substantially central portion thereof, but the diameter of the opening formed in the intermediate plate 2 is one. In FIG. 1, only the opening 1a of the base plate 1 and the opening 2a of the intermediate plate 2 are shown, and the opening of the auxiliary base plate 3 is not shown in FIG. Therefore, in the present embodiment, the opening 2a is an exposure opening and restricts the maximum aperture of the subject optical path.

  The base plate 1 is made of synthetic resin, and three attachment holes 1b, 1b, 1b necessary for attachment to the camera body are provided on the subject side surface. Further, an annular recess 1c is formed so as to surround the opening 1a, and a lens (not shown) can be arranged close to the ground plane 1 side. Further, a shutter blade driving motor M1 and a diaphragm blade driving motor M2 are attached to the subject side of the base plate 1. These motors M1 and M2 are well-known current-controlled motors called moving magnet type motors, and have the same configuration in the case of the present embodiment. The same. Therefore, in the following, the motor M1 for driving the shutter blades will be described in detail on behalf of them.

  First, the rotor 4 has a two-pole permanent magnet magnetized in the radial direction. In the case of this embodiment, as clearly shown in FIG. An output pin 4b formed so as to extend parallel to the rotation shaft 4a at a radial position of the rotation shaft 4a is made of a synthetic resin, and is integrally formed with a cylindrical permanent magnet by an outsert process. And the output pin 4b is arrange | positioned on the extension line | wire of said 2 pole boundary line. As a rotor of this type of motor, a rotor made of a permanent magnet including the output pin 4b is known. However, in the present invention, the rotor 4 is not prevented from being configured as such. .

  The stator frame of the present embodiment is configured in a cylindrical shape in which both ends in the axial direction are closed by a first stator frame 5 and a second stator frame 6 made of synthetic resin, and inside the rotor 4 is bearing. Further, as is well known, recessed grooves 5a and 6a are formed on the outer peripheral surfaces of the first stator frame 5 and the second stator frame 6, and by connecting these recessed grooves 5a and 6a, two grooves are formed. A series of annular grooves are formed so as to surround the two bearing portions. A coil 7 is wound in the annular concave groove. In addition, a window 5b is formed on the peripheral surface of the first stator frame 5, and an arc-shaped long hole 6b centered on the rotation shaft 4a is formed in the second stator frame 6 so as to rotate. The child 4 can be rotated within a predetermined rotation angle. Further, the base plate 1, the intermediate plate 2, and the auxiliary base plate 3 are also formed with long holes 1d, 2b, 3a similar in shape to the long hole 6b, although the sizes thereof are different from each other. Is penetrated.

  The second stator frame 6 has two positioning pins 6c and 6c on the lower surface and is fitted in the two positioning holes 1e and 1e provided in the main plate 1. , 6c may be provided in the base plate 1, and positioning holes corresponding to the positioning holes 1e, 1e may be provided in the second stator frame 6. A tapered surface 6 d having a planar shape is formed on the outer peripheral surface formed in the lower portion of the second stator frame 6. Incidentally, although the magnetic rod 8 is embedded in the first stator frame 5 of the present embodiment, as is well known, the magnetic rod 8 stops the rotor 4 when the coil 7 is not energized. This is for magnetically holding the position. The number is not limited to one as shown.

  The yoke 9 of the present embodiment has a cylindrical shape as a whole and is covered with a stator frame. The yoke 9 is formed with an annular edge 9a on the upper end surface in FIG. 2, and the stator frame is pressed from above so that the positioning pin 6c and the positioning hole 1e are not disengaged. Yes. In FIG. 2, two plate-like attachment pieces 9b and 9c having elasticity are formed on the lower side of the yoke 9, that is, on the open end side of the cylindrical shape with the central axis of the cylindrical shape in between. Has been. And the attachment piece 9b consists of the bending part 9b-1, the vertical part 9b-2, and the hook part 9b-3, and the attachment piece 9c consists of the vertical part 9c-1 and the hook part 9c-2. . On the other hand, the base plate 1 is formed with two square holes 1f and 1g. And the hook part 9b-3 is hung on the hole 1f using the elastic restoring force which the vertical part 9b-2 of the attachment piece 9b has, and the hole 1g has the attachment piece 9c. The hook portion 9c-2 is hung using the elastic restoring force of the vertical portion 9c-1.

  Here, how to attach the motor M1 to the main plate 1 will be described. As can be understood from the above description, the first stator frame 5 and the second stator frame 6 constituting the stator frame of the present invention are in a state where the rotor 4 is supported inside, and the concave groove 5a. , 6a is wound around the coil 7 in advance so as to be firmly integrated. Further, the yoke 9 is fitted to the stator frame configured as described above, but in the case of this embodiment, the yoke 9 is necessarily integrated with the stator frame using an adhesive or the like. You don't need to be.

  Therefore, first, the yoke 9 is fitted to the stator frame, and the vertical portions 9b-2 and 9c-1 of the attachment pieces 9b and 9c are directed toward the central axis of the cylindrical portion, that is, Push toward the inner radial direction of the tube. At this time, since the vertical portion 9b-2 of the mounting piece 9b is not in contact with the second stator frame 6, it is bent in the inner radial direction by being pushed as described above. On the other hand, since only a part of the vertical portion 9c-2 of the attachment piece 9c is in contact with the outer peripheral surface of the second stator frame 6, the non-contact portion has an inner diameter when pressed as described above. It is bent in the direction and comes into contact with the tapered surface 6d. FIG. 4 shows the state at this time.

  With the yoke 9 thus deformed, first, the hook portions 9b-3 and 9c-2 are inserted into the holes 1f and 1g, and the second stator frame 6 is positioned in the process. The pins 6c and 6c are inserted into the positioning frames 1e and 1e of the main plate 1. When the positioning pins 6c and 6c have been inserted into the positioning frames 1e and 1e, that is, when the bottom surface of the second fixed frame 6 is in contact with the top surface of the ground plate 1, the pressing force against the vertical portions 9b-2 and 9c-1 Solve. Thereby, the vertical portions 9b-2 and 9c-1 are restored to their original shapes by their own restoring force, and the hook portions 9b-3 and 9c-2 are moved in the outer radial direction on the blade chamber side, and the holes 1f and 1g Engage with the edge. The state where the motor M1 is attached in this way is the state shown in FIGS.

  Therefore, if the procedure described so far is performed in reverse, the motor M1 can be removed from the main plate 1. In short, in the case of the present embodiment, the motor M1 can be attached to and detached from the base plate 1 simply by moving the yoke 9 in the vertical direction with respect to the surface of the base plate 1 with the yoke 9 fitted. It has become. Therefore, in the assembling process, the relative position of the yoke 9 is not changed with respect to the stator frame composed of the first stator frame 5 and the second stator frame 6, and the coil 7 can be damaged. Absent. In this embodiment, the yoke 9 is provided with two mounting pieces 9b and 9c. However, if necessary, three or more mounting pieces may be provided. In the case of the present embodiment, the second stator frame 6 is formed with the tapered surface 6d only on the surface facing the vertical portion 9c-1, but the surface facing the other vertical portion 9b-2. Also does not prevent it from forming. Further, in this embodiment, the edge 9a is formed on the yoke 9, but the yoke 9 is integrated with at least one of the first stator frame 5 and the second stator frame 6 using an adhesive or the like. The edge portion 9a is not always necessary in the case where it is made to be.

  Then, next, the structure in two blade chambers is demonstrated. Two shutter blades 10 and 11 are arranged between the main plate 1 and the intermediate plate 2. And although the shape and mounting structure are not clearly shown, it has a well-known structure. That is, the shutter blades 10 and 11 are individually attached to two shafts provided on the main plate 1 so as to be rotatable, and the output pin 4b is fitted in both of the long holes formed in them. It is combined. Therefore, when the rotor 4 rotates in the clockwise direction in FIG. 1, the shutter blades 10 and 11 open the opening 2a. Thereafter, when the rotor 4 rotates in the counterclockwise direction, the opening 2a is closed. Has been.

  Further, a single diaphragm blade 12 is disposed between the intermediate plate 2 and the auxiliary base plate 3, but the shape and mounting configuration of the diaphragm blade 12 are not clearly shown. However, they are the same as well known. That is, the diaphragm blade 12 is formed with a diaphragm opening having a diameter smaller than that of the opening 2a and a hole for fitting the output pin of the motor M2, and is rotatably attached to a shaft provided on the base plate 1. It has been. Accordingly, when the rotor of the motor M2 rotates counterclockwise in FIG. 1, the aperture blade 12 also rotates counterclockwise, the aperture opening is inserted into the opening 2a, and the rotor rotates clockwise. The diaphragm blade 12 is configured to retract from the opening 2a.

  Next, the second embodiment will be mainly described with reference to FIG. 5. FIG. 5 shows the state immediately before the motor is attached to the ground plate, similarly to FIG. 4 used for the description of the first embodiment. FIG. Further, since the configuration of the present embodiment is almost the same as the configuration of the first embodiment, in FIG. 5, the same members and portions as those shown in FIG. Therefore, in the following, description thereof will be omitted, and only differences from the embodiment 1 will be described.

  In this embodiment, as can be seen by comparing FIG. 4 and FIG. 5, the positioning holes 1 e and 1 e are not formed in the base plate 1 as in the first embodiment, and the second stator frame 6 is not formed. The positioning pins 6c and 6c are not provided. In the case of the first embodiment, the square holes 1f and 1g of the base plate 1 are formed on the surfaces of the vertical portions 9b-2 and 9c-1 of the mounting pieces 9b and 9c of the yoke 9, as can be seen from FIG. Although the dimension of the parallel side is set to be considerably larger than the width dimension of the mounting pieces 9b and 9c, in the case of this embodiment, it is set to almost the same dimension and penetrates the mounting pieces 9b and 9c. The minimum size that can be achieved. Further, the yoke 9 is attached to at least one of the first stator frame 5 and the second stator frame 6 with an adhesive or the like.

  As described above, in the case of Example 1, the motor M1 is attached so that it cannot move in a direction parallel to the surface of the main plate 1 by fitting the positioning holes 1e, 1e and the positioning pins 6c, 6c. It was. However, in the case of the present embodiment, since such positioning holes 1e, 1e and positioning pins 6c, 6c are not provided, instead, such movement is limited by the shape of the holes 1f, 1g, The mounting state of the motor M1 is restricted. That is, in this embodiment, the motor M1 is prevented from moving in the direction of the side parallel to the surfaces of the vertical portions 9b-2 and 9c-1 of the mounting pieces 9b and 9c in FIG. Movement in a direction parallel to the side is prevented by a side orthogonal to the side. Also in the case of the present embodiment, three or more mounting pieces may be formed on the yoke 9 and three or more holes may be formed on the base plate 1 for engaging the hooks at the tips thereof. In this case, it is not necessary to make all of the engagement relationships as in the present embodiment, and as long as at least two engagement relationships are as in this embodiment, the other cases are the same as those in the first embodiment. It does not matter.

  Thus, according to the configuration of the present embodiment, there is an advantage that the positioning holes 1e and 1e and the positioning pins 6c and 6c need not be provided as in the first embodiment. In addition, since the attachment / detachment work of the motor M1 with respect to the ground plane 1 is performed according to the case of Example 1, the description is abbreviate | omitted. Further, what has been described in the first embodiment is also applicable to the present embodiment, except for the description of the unique configuration of the first embodiment. Further, in this embodiment, as described above, the yoke 9 is attached to at least one of the first stator frame 5 and the second stator frame 6 with an adhesive. Therefore, the edge portion 9a formed on the yoke 9 is not necessarily required. Furthermore, as in the first embodiment, the yoke 9 does not necessarily have to be bonded to the stator frame composed of the first stator frame 5 and the second stator frame 6, and the relative positional relationship between the two is not limited. If not shifted, they may be integrated in a press-fitted state.

  Each of the above embodiments has been described in the case of a camera blade driving device in which the diaphragm device and the shutter device are configured as one unit. However, the present invention is not limited to such a device, and is a single unit. The present invention is also applicable to a device configured as a shutter device, a diaphragm device, a filter device, and a barrier device, and to a device in which two or more of a shutter device, a diaphragm device, and a filter device are unitized.

1 is a plan view of Example 1. FIG. It is the sectional view on the AA line of FIG. FIG. 3 is a perspective view of the yoke shown in FIGS. 1 and 2. It is sectional drawing of Example 1 which showed the state just before attaching a motor to a ground plane. It is sectional drawing of Example 2 which showed the state just before attaching a motor to a ground plane.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plate 1a, 2a Opening part 1b Mounting hole 1c Recessed part 1d, 2b, 3a, 6b Long hole 1e Positioning hole 1f, 1g Hole 2 Intermediate | middle board 3 Auxiliary ground plate M1, M2 Motor 4 Rotor 4a Rotating shaft 4b Output pin 5 1st Stator frame 5a, 6a Concave groove 5b Window 6 Second stator frame 6c Positioning pin 6d Tapered surface 7 Coil 8 Magnetic rod 9 Yoke 9a Edge portion 9b, 9c Mounting piece 9b-1 Bent portion 9b-2, 9c- DESCRIPTION OF SYMBOLS 1 Vertical part 9b-3, 9c-2 Hook part 10,11 Shutter blade 12 Aperture blade

Claims (3)

  Two frame members constitute a storage chamber provided with blocking walls at both ends of the cylindrical shape. Each of the blocking walls is provided with a bearing portion, and a series of concave grooves are formed on the outer surface so as to surround the two bearing portions. The formed stator frame, the coil wound in the concave groove, and a permanent magnet, which is supported by the bearing portion in the housing chamber and is predetermined in a direction corresponding to the energization direction of the coil. A rotor that is reciprocally rotated within a rotation angle range of at least one, an at least one output pin that is integral with the rotor and projects outward from the storage chamber, a tubular portion, and a tubular portion that projects from the tubular portion. A plurality of mounting pieces having flexibility in the radial direction of the cylindrical portion, the cylindrical portion being fitted on the outer peripheral surface of the stator frame, and the mounting piece extending in parallel with the rotating shaft A yoke having a hook portion bent in the outer radial direction, and a photographing optical path And a base plate having a plurality of holes through which the output pin is operably penetrated and a plurality of attachment holes through which the tip ends of the attachment pieces are individually penetrated. The yoke is configured to bend the attachment piece inward in the radial direction and insert the hook portion into the attachment hole, and then engage the hook portion with the base plate using the restoring force of the attachment piece. A blade drive device for a camera.   The stator frame and the ground plate are provided with a plurality of positioning pins on one of them and a plurality of positioning holes on which the positioning pins are fitted, respectively. Camera blade drive device.   2. The blade drive for a camera according to claim 1, wherein an attachment state of the stator frame to the base plate is restricted only by engagement between at least two of the attachment holes and the attachment piece. apparatus.

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