JP5021053B2 - Camera blade drive - Google Patents

Description

  The present invention relates to a camera blade driving device for driving blades such as a shutter of a camera.

  As a conventional small motor used in a camera blade driving device for driving a camera shutter or the like, for example, one described in JP-A-7-191377 is known. The motor described in this publication includes a rotor magnet (rotor), a stator disposed so as to face the rotor magnet, a coil that generates electromagnetic force in the stator and applies the rotational force to the rotor magnet, and the rotor magnet. And two support members that support the substrate so as to be able to rotate and to be sandwiched.

In the above prior art, shaft portions are provided at the rotation centers of the upper and lower surfaces of the rotor magnet, and holes are formed in the two support members so as to be fitted to the shaft portions of the rotor magnet. The rotor magnet is rotatably supported by inserting the portion.
However, if the hole formed in the support member as in the prior art passes through the support member, dust or the like may enter from the hole and adhere to the shaft portion of the rotor magnet. The rotating operation of the rotor magnet may become unstable. Further, if the holes for fitting the shaft portions of the two support members are not arranged in a straight line, the shaft portions of the rotor are assembled in a state of being displaced or inclined, and the rotor can be smoothly rotated. Can not.
Therefore, when such a motor is used as a driving source for a blade that moves forward and backward with respect to the opening for exposure, the blade cannot be accurately operated at a predetermined timing, and a preferable shutter operation or aperture operation is obtained. Is difficult.

JP-A-7-191377

  The present invention has been made in view of the above circumstances, and its object is to enable a stable rotating operation of the rotor while simplifying the structure, facilitating assembly, etc. It is an object of the present invention to provide a camera blade driving device capable of smoothly driving a blade that moves forward and backward with respect to an opening for exposure.

The camera blade drive device of the present invention is provided with a base plate having an opening for photographing, a blade that is rotatably supported by the base plate and moves forward and backward with respect to the opening for exposure, and is erected on the base plate. Shaft part, a rotating main body part formed of a permanent magnet , an operating piece projecting from the rotating main body part, and a through-hole directly formed in the permanent magnet of the rotating main body part for insertion of the shaft part. and its a rotor operating piece can be connected to the blade, assembled from the protruding direction of the shaft portion on the base plate is arranged outside the rotor while being fitted freely rotated from the protruding direction of the shaft portion in the shaft portion And a stator including a coil and a yoke for applying a rotational force to the rotor, and a base that is brought into contact with the end face of the shaft portion from the protruding direction of the shaft portion so as to cover the rotor and the stator fitted in the shaft portion. Including a cover plate fixed to the plate. It is set to.
According to this configuration, the rotor is rotatably fitted to the shaft portion provided on the base plate, is covered with the base plate and the cover plate, and is connected to the blade so as to exert a rotational force. The rotation of the rotor arranged at the position causes the blades to advance and retreat with respect to the exposure opening.
In other words, since the rotor is rotatably supported without being exposed to the outside, dust or the like is prevented from adhering to the rotation center of the rotor, and is provided so as to protrude from the base plate. Since the rotor is rotatably supported by only one shaft portion, the shaft portion can be prevented from being displaced or tilted during assembly, and the rotor can be rotated stably. The blades can be driven to smoothly advance and retract with respect to the opening.
In addition, the rotor is rotatably fitted in the shaft portion protruding from the base plate and connected to the blades, and the cover plate is brought close to the rotor and the stator so as to cover the end surface of the shaft portion. Since the assembly is completed simply by contacting and fixing to the base plate, the assembly work can be easily performed, and the base plate and the cover plate do not hinder the rotation of the rotor in the area of the rotor. In this way, the rotor can be rotated more smoothly and reliably.

In the above configuration, the shaft portion may be formed of a magnetic material.
According to this configuration, since an attractive force is generated between the rotor (permanent magnet) and the shaft portion, when the coil (copper wire) is not energized, some force acts on the rotor due to an impact or the like. And it can prevent that a rotor rotates accidentally. Also, when the coil (copper wire) is energized and the rotor rotates, the shaft portion is always located at the center of rotation of the rotor due to the attractive force of the rotor (permanent magnet). Applies a uniform force and can rotate the rotor more stably.

In the above configuration, a configuration in which the shaft portion is magnetized can be adopted.
According to this configuration, since an attractive / repulsive force is generated between the shaft portion and the rotor (permanent magnet thereof), the optimum initial position (stop position) of the rotor can be easily obtained by using this. Can be set. For example, if the shaft is magnetized so that the position where a strong attractive force is generated is the initial position, the coil (copper wire) is not energized, and there is a strong space between the shaft and the rotor. Since the attractive force acts, the malfunction of the rotor due to impact or the like can be prevented, and the rotor can be kept stopped at the initial position.

  According to the camera blade driving device of the present invention having the above-described configuration, the rotor can be stably rotated while achieving the simplification of the structure, the ease of assembly, etc. Thus, it is possible to obtain a camera blade driving device that can smoothly drive the blades that move forward and backward.

It is a disassembled perspective view which shows embodiment of the blade drive device for cameras which concerns on this invention. It is a top view of the blade drive device for cameras shown in FIG. It is sectional drawing of the blade drive device for cameras shown in FIG. It is sectional drawing which shows other embodiment of the blade drive device for cameras which concerns on this invention. It is sectional drawing which shows other embodiment of the blade drive device for cameras which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the camera blade driving device 1 is rotated around a base plate 8 having a photographing opening 8 a, a cover plate 9 disposed at a predetermined interval from the base plate 8, and the base plate 8. The blades 6a and 6b that are supported movably and move forward and backward with respect to the opening 8a for exposure, the shaft portion 11 protruding from the base plate 8, and the shaft portion 11 are rotatably fitted and are also fitted to the blades 6a and 6b. A connected rotor 2, a yoke 14 as a stator that is disposed outside the rotor 2 and applies a rotational force to the rotor 2, a coil 15, a connecting yoke 21, and the like are provided.

As shown in FIGS. 1 and 3, the rotor 2 is formed at a rotation body portion 4 including a bearing portion 3 a and a cylindrical permanent magnet 3 b disposed on the outer peripheral portion thereof, and a rotation center portion of the rotation body portion 4. And a working piece 7 formed so as to protrude from the lower part of the outer peripheral surface of the rotary body 4.
A shaft portion 11 protruding from the base plate 8 is inserted into the through hole 5.
The actuating piece 7 is formed to project in a substantially L-shaped cross section so as to be connected to two blades 6a and 6b (only one blade 6a is shown in FIG. 2). Here, the operating piece 7 is integrally formed with the rotating main body 4 by a mold or the like.
The rotor 2 is accommodated in a space formed by the base plate 8 and the cover plate 9 by inserting the shaft portion 11 into the through hole 5 and assembling a cover plate 9 described later from above. It is designed to be supported rotatably.

As shown in FIGS. 1 to 3, the base plate 8 is formed as, for example, a plastic disc placed on the shutter base plate 10, and has a photographing opening 8a formed in a circular shape at the center thereof. A hole 8b and a projecting portion 8c for fixing the cover plate 9, a shaft portion 11 formed by projecting integrally, a through hole 12 formed at a position adjacent to the shaft portion 11, and the like are provided.
The photographing opening 8a is opened and closed by two blades 6a and 6b.
The shaft portion 11 has a protruding portion 13 formed at a length protruding from the upper surface of the rotating main body portion 4 at the upper end portion thereof, is formed in a step-down manner from the protruding portion 13, and contacts the lower surface of the cover plate 9 to cover the cover plate 9. It is formed so as to demarcate an upper end surface (lower part) 11a and the like that are formed so as to be received.
In the through hole 12, the operating piece 7 connected to the blades 6a and 6b is movably disposed in a state where the rotor 2 is fitted into the shaft portion 11 (the shaft portion 11 is inserted into the through hole 5). It is formed as follows.
The shaft portion 11 is connected and fixed to the base plate 8 so that the cover plate 9 covers the rotor 2 in a state where the rotor 2 is fitted (the shaft portion 11 is inserted into the through hole 5). Then, the upper end surface 11a comes into contact with the lower surface of the cover plate 9, and the space between the cover plate 9 and the base plate 8 is maintained at a predetermined gap in the region where the rotor 2 rotates.

As shown in FIGS. 1 to 3, the cover plate 9 is made of plastic, is formed in an arc shape so as to cover the rotor 2 and the two yokes 14 and 14, and is fixed so as to protrude from the back surface thereof. Projections 18a, 18a, 18b, 18b, and through holes 20, 23 formed in the upper surface portion.
The protrusions 18 a and 18 a are formed so as to be inserted into holes 8 b and 8 b formed in the base plate 8.
The protrusions 18b and 18b are formed so as to be inserted into holes 14a formed in each yoke 14.
The through hole 20 is formed so that the protruding portion 13 of the shaft portion 11 is inserted.
The through hole 23 is formed so that a leg portion 22 of a connecting yoke 21 described later is inserted.

As shown in FIGS. 1 and 3, the cover plate 9 includes a bobbin 16 in which the rotor 2 is fitted into the shaft portion 11 of the base plate 8 and a yoke 14 and a coil 15 are wound on the base plate 8. In such a state, the bolts 19, 19 are screwed into the projecting portions 8 c, 8 c so as to cover these components from above, and are fixed to the base plate 8.
At this time, the protrusions 18b and 18b are inserted into the holes 14a of the yokes 14, and the protruding portions 13 of the shaft portion 11 are inserted into the through holes 20 formed in the upper surface portion of the cover plate 9, so that the upper end surface ( The lower part 11a is in contact with the lower surface of the cover plate 9 to receive the cover plate 9.

  In this way, the rotor plate 2 is rotatably fitted to the shaft portion 11 protruding from the base plate 8, and the cover plate is formed so as to cover the rotor 2, the yoke 14, and the coil 15 (and the bobbin 16) from above. 9 is brought close to the upper end surface 11a of the shaft portion 11 and fixed to the base plate 8 so that the assembling is completed. Since the base plate 8 and the cover plate 9 are maintained at a predetermined interval so as not to prevent the rotation of the rotor 2, the assembling work can be easily performed and the rotor 2 can be more smoothly and reliably secured. Can be rotated.

The two yokes 14 and 14 form a magnetic field, and are arranged on the base plate 8 and outside the rotor 2 so as to sandwich the rotor 2 as shown in FIGS. Each is provided with a standing bent portion 17 as an iron core, a hole 14a into which a protrusion 18b is inserted, and the like.
Each yoke 14 is provided with a coil 15 for generating an electromagnetic force to give the rotor 2 a rotational force.
Each coil 15 is formed by winding a copper wire around a bobbin 16 having a hollow portion 16a. By inserting the bent portion 17 of the yoke 14 into the hollow portion 16a of the bobbin 16, the coil 15 (bobbin 16). Is fixed to the yoke 14.

As shown in FIGS. 1 to 3, the connecting yoke 21 is disposed on the cover plate 9 and formed in an arc shape so as to connect the two yokes 14, 14, and is formed at both ends thereof. Leg portions 22 and 22 are provided.
The connecting yoke 21 has its leg portions 22 and 22 inserted into the through holes 23 and 23 of the cover plate 9 and is connected to the standing bent portions 17 and 17 of the yokes 14 and 14.
The two yokes 14, 14, the two coils 15, 15 and the connecting yoke 21 constitute a stator.

  In the camera blade drive device 1 configured as described above, when a positive direction is applied to the copper wire of the coil 15 by a signal from a control device (not shown), an electromagnetic force is generated in the yoke 14, and the rotor 2. 2 rotates counterclockwise in FIG. 2, and the blades 6a and 6b move toward the open position that opens the opening 8a. On the other hand, when the copper wire of the coil 15 is energized in the reverse direction, an electromagnetic force in the opposite direction is generated in the yoke 14, the rotor 2 rotates clockwise in FIG. 2, and the blades 6a and 6b are in the closed position. Move towards.

  According to the camera blade driving device 1 of the above-described embodiment, the rotor 2 is rotatably fitted to the shaft portion 11 provided on the base plate 8 and is covered with the base plate 8 and the cover plate 9 so as to rotate. Since the rotor 2 is rotatably supported without being exposed to the outside, the dust or the like is collected in the rotation center portion (through hole 5) of the rotor 2. Since the rotor 2 is rotatably supported by only one protruding shaft portion 11, it is possible to prevent the shaft portion 11 from being displaced or tilted during assembly. The rotor 2 can be stably rotated, and therefore the blades 6a and 6b can be driven to smoothly advance and retreat with respect to the opening 8a for exposure.

Further, since the cover plate 9 is fixed to the base plate 8 so as to cover the rotor 2 by contacting the upper end surface 11a of the shaft portion 11 with the rotor 2 fitted in the shaft portion 11, The rotor 2 is rotatably fitted in the shaft portion 11 projecting from the base plate 8, and the cover plate 9 is brought close to the upper surface 11 a of the shaft portion 11 so as to cover the rotor 2 from above. Thus, since the assembly is completed simply by fixing to the base plate 8, the assembly operation can be easily performed, and in the region of the rotor 2, the base plate 8 and the cover plate 9 are connected to the rotor 2. Since the rotation is maintained at a predetermined interval so as not to prevent the rotation, the rotor 2 can be rotated more smoothly and reliably.
In the present invention, the bearing portion 3a of the rotary main body 4 may also be formed of a permanent magnet, and the through hole 5 may be provided in the permanent magnet.

Next, another embodiment of the camera blade driving device according to the present invention will be described with reference to FIG. In the figure, members that are the same as or equivalent to those in the above-described embodiment are given the same reference numerals, and descriptions thereof are omitted.
As shown in FIG. 4, a camera blade drive device 1A according to this embodiment includes a base plate 8A having a photographing opening 8a, a cover plate 9 disposed at a predetermined interval from the base plate 8A, and a base. The blades 6a and 6b that are rotatably supported by the plate 8A and move forward and backward with respect to the opening 8a for exposure, the shaft portion 33 protruding from the base plate 8A (the concave portion 31), and the shaft portion 33 are rotatable. The rotor 2 is fitted to the blades 6a and 6b and connected to the blades 6a and 6b. The yoke 14 is disposed outside the rotor 2 and applies a rotational force to the rotor 2, the coil 15, the connecting yoke 21 and the like. It has.

As shown in FIG. 4, the base plate 8 </ b> A is formed, for example, as a plastic disc placed on the shutter base plate 10, and has a photographing opening 8 a and a cover plate 9 formed in a circular shape at the center thereof. 8b and projecting portion 8c for fixing the shaft portion 33, a recess portion 31 for fitting the shaft portion 33 to project the shaft portion 33, and a position adjacent to the recess portion 31 (the projecting shaft portion 33). A through hole 12 is provided.
The shaft portion 33 is made of a magnetic material such as iron, and has an upper end similar to that of the above-described shaft portion 11 in addition to the protruding portion 32 formed with a length protruding from the upper surface of the rotating body portion 4. It is formed so as to define an end face, is fitted in the recess 31 and is fixed to the base plate 8A with an adhesive or the like.
The shaft portion 33 is magnetized by a magnetizing device or the like and has a pole. Here, the shaft portion 33 is incorporated into the rotating main body portion 4 when the operating piece 7 of the rotor 2 is in an initial position (for example, a position corresponding to the closed position of the blades 6a and 6b as shown in FIG. 2). The magnet is magnetized so as to generate the strongest attractive force with the permanent magnet 3b.

  According to this embodiment, when the operating piece 7 of the rotor 2 is in the initial position and the copper wire of the coil 15 is not energized, the pole of the shaft portion 33 and the rotating main body portion 4 (permanently) of the rotor 2. Since the strongest attraction force is generated between the poles of the magnet 3b), even if some force acts on the rotor 2 due to an impact or the like, the rotor 2 is not easily rotated and the stopped state is maintained. Is done. Further, when the rotor 2 rotates by energizing the copper wire of the coil 15, the shaft portion 33 is always positioned at the rotation center of the rotor 2 due to the suction force between the rotating main body portion 4 and the shaft portion 33. Therefore, the rotor 2 always rotates in a state where a uniform force is applied.

  Thus, by forming the shaft portion 33 of a magnetic material and magnetizing the shaft portion 33, the rotor 2 may be erroneously operated due to an impact or the like when the copper wire of the coil 15 is not energized. Can be prevented. Further, when the copper wire of the coil 15 is energized, not only does the adverse effect on the rotor 2 due to dust etc. disappear, but also a uniform force acts on the rotor 2 so that the rotational operation of the rotor 2 is more stable. Become.

  Also in this embodiment, the rotor 2 is rotatably fitted to the shaft portion 33 provided on the base plate 8A and is covered with the base plate 8A and the cover plate 9 in the same manner as the above-described embodiment, so that the rotational force is increased. Since the rotor 2 is connected to the blades 6a and 6b so as to be exerted and supported so as to be rotatable without being exposed to the outside, dust or the like adheres to the rotation center portion (through hole 5) of the rotor 2. In addition, since the rotor 2 is rotatably supported by only one shaft portion 33 provided in a projecting manner, it is possible to prevent positional deviation and inclination of the shaft portion 33 during assembly, The rotor 2 can be stably rotated. Therefore, the blades 6a and 6b can be driven so as to smoothly advance and retreat with respect to the opening 8a for exposure.

  Further, since the cover plate 9 is fixed to the base plate 8A so as to cover the rotor 2 by contacting the upper end surface 11a of the shaft portion 33 with the rotor 2 fitted in the shaft portion 33, The rotor 2 is rotatably fitted in the shaft portion 33 projecting from the base plate 8A, and the cover plate 9 is brought close to the upper portion 11a of the shaft portion 33 so as to cover the rotor 2 from above. As the assembly is completed simply by fixing to the base plate 8A, the assembly operation can be easily performed, and in the region of the rotor 2, the base plate 8A and the cover plate 9 are attached to the rotor 2. Since the rotation is maintained at a predetermined interval so as not to prevent the rotation, the rotor 2 can be rotated more smoothly and reliably.

  In the above-described embodiment, the configuration in which the shaft portion 33 is magnetized is shown. However, even if the shaft portion 33 is not magnetized, the shaft portion is a magnetic body, and thus the permanent magnet 3b of the rotor 2 is used. A suction force acts on the shaft 2 and the shaft portion is attracted to the rotor 2. For this reason, when the coil 15 is not energized, the rotor 2 is difficult to rotate, and malfunction of the rotor 2 due to impact or the like can be reduced.

Next, still another embodiment of the camera blade driving device according to the present invention will be described with reference to FIG. In the figure, members that are the same as or equivalent to those in the above-described embodiment are given the same reference numerals, and descriptions thereof are omitted.
As shown in FIG. 5, a camera blade drive device 1B according to this embodiment includes a base plate 8A having a photographing opening 8a, a cover plate 9 disposed at a predetermined interval from the base plate 8A, and a base. The blades 6a and 6b that are rotatably supported by the plate 8A and move forward and backward with respect to the opening 8a for exposure, the shaft portion 33B protruding from the base plate 8A, and the shaft portion 33B are rotatably fitted and blades A rotor 2 connected to 6a and 6b, a yoke 14 as a stator which is disposed outside the rotor 2 and applies a rotational force to the rotor 2, a coil 15, a connecting yoke 21 and the like are provided.

The shaft portion 33B is made of a magnetic material, for example, iron, and as shown in FIG. 5, is formed so as to define a protruding portion 32B at the upper end portion thereof and other upper end surfaces similar to the shaft portion 11 described above. The base plate 8A is fixed with an adhesive or the like by being fitted into the recess 33.
The protrusion 32 </ b> B protrudes from the upper surface of the rotary body 4, is formed to have a length that extends through the through hole 20 of the cover plate 9 to the height position of the connection yoke 21, and is in contact with the connection yoke 21.

  Thus, since the magnetic shaft portion 33B is in contact with the connecting yoke 21, when the copper wire of the coil 15 is energized, the shaft portion 33B has a pole. As a result, an attractive / repulsive force is generated between the shaft portion 33B and the permanent magnet 3b of the rotor 2, and the shaft portion 33B acts to increase the magnetic force and assists the function of the yoke 14. As a result, the rotational force of the rotor 2 can be increased.

  Also in this embodiment, the rotor 2 is rotatably fitted to the shaft portion 33B provided on the base plate 8A and is covered with the base plate 8A and the cover plate 9 in the same manner as in the above-described embodiment, so that the rotational force is increased. Since the rotor 2 is connected to the blades 6a and 6b so as to be exerted and supported so as to be rotatable without being exposed to the outside, dust or the like adheres to the rotation center portion (through hole 5) of the rotor 2. In addition, since the rotor 2 is rotatably supported by only one shaft portion 33B provided so as to protrude, it is possible to prevent the positional deviation or inclination of the shaft portion 33B during assembly, The rotor 2 can be stably rotated. Therefore, the blades 6a and 6b can be driven so as to smoothly advance and retreat with respect to the opening 8a for exposure.

  Further, since the cover plate 9 is fixed to the base plate 8A so as to cover the rotor 2 by contacting the upper end surface 11a of the shaft portion 33B with the rotor 2 fitted in the shaft portion 33B, The rotor 2 is rotatably fitted to the shaft portion 33B projecting from the base plate 8A, and the cover plate 9 is brought close to the rotor plate 2 so as to cover the rotor 2 from above to bring the upper end surface 11a of the shaft portion 33B into contact. As the assembly is completed simply by fixing to the base plate 8A, the assembly operation can be easily performed, and in the region of the rotor 2, the base plate 8A and the cover plate 9 are attached to the rotor 2. Since the rotation is maintained at a predetermined interval so as not to prevent the rotation, the rotor 2 can be rotated more smoothly and reliably.

  In the embodiment described above, the configuration in which the shaft portions 11, 33, 33B inserted into the through holes 5 of the rotor 2 are projected (standing) on the base plate 8 is shown, but the present invention is limited to this. Instead of this, the shaft portion may be projected (standing) on the cover plate.

  As described above, the camera blade driving device according to the present invention achieves a simplified structure, facilitates assembly, etc., and enables stable rotation of the rotor, so that the opening for exposure can be controlled. Since the blades that move forward and backward can be driven smoothly, the present invention can be applied to various cameras such as a portable camera, a fixed camera, and a surveillance camera.

1, 1A, 1B Camera blade drive device 2 Rotor 3b Permanent magnet 4 Rotating body 5 Through hole 6a, 6b Blade 7 Actuating piece 8, 8A Base plate 8a Exposure opening 8b Hole 8c Projection 9 Cover plate 11, 33, 33B Shaft 11a Upper end surface 12 Through hole 13 Projection 14 Yoke (stator)
14a Hole 15 coil (stator)
16 Bobbin 16a Hollow portion 17 Standing bent portions 18a, 18b Protrusion 19 Bolt 20, 23 Through hole 21 Connecting yoke (stator)
22 Leg 31 Recess 32B Projection

Claims (3)

A base plate having an opening for photographing;
A blade that is rotatably supported by the base plate and moves forward and backward with respect to the opening;
A shaft portion erected on the base plate;
A rotating body part formed by a permanent magnet, an operating piece projecting from the rotating body part, and a through-hole formed directly in the permanent magnet of the rotating body part so that the shaft part can be inserted; A rotor in which the operating piece can be connected to the blade while being rotatably fitted to the shaft portion from the protruding direction of the shaft portion;
A stator including a coil and a yoke that are assembled to the base plate from the projecting direction of the shaft portion and arranged on the outside of the rotor and that imparts rotational force to the rotor;
A cover plate fixed to the base plate and brought into contact with the end surface of the shaft portion from the protruding direction of the shaft portion so as to cover the rotor and the stator fitted into the shaft portion;
including,
A blade drive device for a camera. The shaft portion is formed of a magnetic material.
The camera blade driving device according to claim 1, wherein The shaft portion is magnetized.
The blade driving device for a camera according to claim 2.

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