JP2016218194A - Blade driving device and shutter apparatus, and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a blade driving device capable of achieving blade driving in which bound motion is reduced, and a shutter apparatus; and an imaging apparatus.SOLUTION: A blade driving device includes: an opening forming member for forming an opening through which light passes; blades that are inserted into or withdrawn from the opening; and a power transmission member that engages with the blades to move in a reciprocating manner within a predetermined range and transmits power to the blades. Magnetic reaction or adsorption to the power transmission member is generated at a returning motion time of the reciprocating power transmission member, and the motion of a driving transmission member is controlled.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a blade driving device that drives a blade that enters and exits a path through which light passes, a shutter device that includes the blade driving device, and an imaging device that includes the blade driving device.

    As a camera lens shutter, there is known a structure in which a shutter blade is disposed at a position close to a photographing lens and a circular photographing optical path opening is opened and closed by the shutter blade (see Patent Document 1). In the camera blade drive mechanism of Patent Document 1, a long hole is provided in the main ground plate, and the output pin of the rotor reciprocates in the long hole, and the shutter blade engaged with the output pin is on the main ground plate. The shutter blade is brought into contact with the stopper and stopped at each end stage of the closing operation or opening operation of the shutter blade.

Japanese Patent Laid-Open No. 2005-24640

  In the camera blade driving device as in Patent Document 1, the output pin is brought into contact with the end of the long hole provided in the main base plate, so that the impact at the time of contact is transmitted to the shutter blade. A so-called bounce operation occurs in which the operation of the shutter blades is not stable. The bounce operation is not limited to the contact of the output pin described above, but also occurs when the shutter blade is brought into contact with a stopper or the like to stop the operation of the shutter blade.

  The present invention provides a blade driving device, a shutter device, and an imaging device that can realize blade driving with reduced bounding motion.

The blade driving device of the present invention is configured to reciprocate within a predetermined range by engaging an opening forming member that forms an opening through which light passes, a blade that enters and exits from the opening, and the blade. A power transmission member that transmits power to the blades, and causes a magnetic repulsion or adsorption action to the power transmission member when the power transmission member that reciprocates is turned back. The operation of the member is controlled.
According to this aspect of the present invention, the bounce operation can be reduced by controlling the operation of the power transmission member by exerting a magnetic action on the power transmission member during the folding operation.

Further, in the present invention, the opening forming member is provided with a through hole in which the drive pin of the power transmission member is inserted and reciprocated, and the drive pin is inserted into the opening when the power transmission member is turned back. When contacting the one end of the through hole, the drive pin may generate a magnetic repulsive force on the drive transmission member in a direction away from the one end of the through hole.
According to this aspect of the present invention, it is possible to effectively suppress the impact when the drive pin comes into contact with one end of the through hole, using the magnetic repulsive force.

In the present invention, the first magnet portion provided in the opening forming member and the second magnet portion provided in the power transmission member are brought close to each other during the folding operation of the power transmission member. Magnetic repulsion or adsorption may be temporarily generated.
According to such an aspect of the present invention, if the power transmission member is temporarily turned only during the folding operation of the power transmission member, and the operation of the power transmission member is controlled, the bounding operation is performed. Can be reduced.

In the present invention, a magnetic repulsion action is generated on the same pole side of the first magnet portion provided in the opening forming member and the second magnet portion provided in the power transmission member, and the power Control may be performed so that the operation of the transmission member is decelerated.
According to this aspect of the present invention, if the operation of the power transmission member is decelerated and controlled by the magnetic repulsive force, the bounce operation can be reduced.

In the present invention, a magnetic adsorption action is generated on the opposite pole side of the first magnet portion provided in the opening forming member and the second magnet portion provided in the power transmission member, and the power Control may be performed so that the operation of the transmission member stops.
According to this aspect of the present invention, the bounce operation can be reduced if the operation of the power transmission member is stopped and controlled by the magnetic attractive force.

In the present invention, the power transmission member has a rotation center shaft for turning the drive pin engaged with the engagement hole of the blade, and the power transmission member of the power transmission member provided with the drive pin is provided. A second magnet portion that acts magnetically with the first magnet portion provided in the opening forming member may be embedded in the end portion.
According to this aspect of the present invention, the bounce operation can be reduced by controlling the rotation operation of the power transmission member by a magnetic action.

Moreover, in the said invention, the said blade | wing was provided with two or more with respect to one said opening part, and each said engagement hole of the said blade | wing was penetrated in common with respect to one said drive pin. It may be a feature.
According to such an aspect of the present invention, it is possible to reduce the bouncing motion for a plurality of blades together.

In the present invention, the shutter device including the above-described blade driving device or the imaging device including the above-described blade driving device is also widely targeted.
According to this aspect of the present invention, it is possible to realize an imaging device such as a shutter device or a camera that reduces the influence of the bounding operation on the blade (shutter blade) and enables high-quality imaging.

  According to the present invention, it is possible to realize a blade driving device, a shutter device, and an imaging device that can realize blade driving with reduced bounding motion.

The disassembled perspective view of the light quantity adjustment apparatus (blade drive device) which concerns on one Embodiment of this invention. The external appearance top view which shows the principal part of the light quantity adjustment apparatus of FIG. The expanded sectional view of the light quantity adjustment apparatus shown in FIG. The top view which shows the fully open state which the shutter blade opened the opening part fully. The block diagram of a rotor (drive pin). The figure which shows the relationship between the rotor and permanent magnet at the time of the fully open state shown in FIG. The top view which shows the fully closed state which the shutter blade | wing fully opened the closing part. The figure which shows the relationship between the rotor and permanent magnet at the time of the fully-closed state shown in FIG. The figure which the permanent magnet corresponding to the permanent magnet of a rotor (drive pin) front-end | tip becomes a different polarity.

  The blade drive device of the present invention controls the folding operation of the power transmission member by using a magnetic repulsive force or attraction force in the process of reciprocating the power transmission member that transmits power to the blades, for stable operation of the blade. This is to reduce the bounce operation that is a harmful effect.

  More specifically, a blade that enters and exits an opening (light passage path) through which light passes, and a power transmission member that engages with the blade and reciprocates within a predetermined range to transmit power to the blade. When the power transmission member that reciprocates is turned back, a magnetic repulsion or adsorption action is generated on the power transmission member to control the operation of the drive transmission member.

  Here, controlling the operation of the drive transmission member means, for example, in order to reduce the physical impact received by the blade or the power transmission member during the folding operation of the power transmission member. This includes limiting the operation of the drive transmission member by using a magnetic attractive force or repulsive force.

  That is, when the cause of the bounce operation is that the traveling blade or the driving power transmission member physically collides with another member, the magnetic action is performed immediately before or just after the collision. And the operation of the power transmission member is temporarily limited.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 show an entire camera shutter device which is an example of a light amount adjusting device (blade driving device) according to an embodiment of the present invention.

  As shown in the figure, the camera shutter device of the present embodiment includes a base plate 10 having openings 10j and 20a for exposure, a press plate 20 disposed on one side of the base plate 10, and openings 10j and 20a. Shutter blades 31, 32, 33, and 34 for opening and closing and an electromagnetic actuator as an electromagnetic drive source for driving the shutter blades 31 and the like.

  The base plate 10 is an opening forming member having an opening 10j for exposure. The support shafts 10d, 10e, 10f, and 10g for supporting the shutter blade 31 and the like are provided on one surface on the side of the presser plate 20, and the shutter blade 31. Stoppers 10h and 10i are provided as restricting members for restricting movement of a predetermined amount or more when the head or the like moves to the open or close side.

  The presser plate 20 is disposed on one side of the above-described base plate 10 and forms a travel space in which the plurality of shutter blades 31 and the like travel with the base plate 10. The pressing plate 20 has an opening 20a that communicates with the opening 10j of the base plate 10, and serves as an opening forming member that forms the opening 20a.

  Further, the electromagnetic actuator is disposed on the other surface side of the presser plate 20, that is, on the side opposite to the side on which the shutter blades 31 and the like are disposed. As shown in the figure, this electromagnetic actuator includes a rotor 41 that is magnetized to N and S poles and is rotatably supported within a predetermined angle range, an exciting coil 42, a yoke 43 that forms a magnetic circuit, and the like. Consists of. A rotor (drive lever) 41 serving as a power transmission member for the blades is integrally formed with a drive pin 41c connected to the shutter blade 31 and the like at a non-coaxial position with respect to the rotation center.

  As shown in FIGS. 1 and 4, the shutter blade 31 and the like are composed of a first shutter blade 31, a second shutter blade 32, a third shutter blade 33, and a fourth shutter blade 34. The first to fourth shutter blades 31, 32, 33, 34 are respectively formed with circular holes 31a, 32a, 33a, 34a and elongated holes 31b, 32b, 33b, 34b. Further, the support shafts 10d, 10e, 10f, and 10g of the base plate 10 are inserted into the circular holes 31a, 32a, 33a, and 34a, and the first to fourth shutter blades 31, 32, 33, and 34 are rotatably supported. ing. A drive pin 41c is inserted into the long holes 31b, 32b, 33b, 34b.

  As the rotor 41 rotates, the shutter blades 31 and the like approach and move away from each other so that, for example, the shutter blade 31 and the like move from the standby position shown in FIG. 4 to the closing operation as shown in FIG. The opening 10j and the opening 20a are opened and closed by the cooperative operation of both.

  FIG. 7 shows a state in which the shutter blade 31 and the like have covered the opening 10j, and 32e and 33e shown in FIG. 4 are ridge lines that determine the opening amount when the shutter blade 31 and the like cover the opening 10j. Yes, the ridge lines pass through each other, and this is in a closed state. During the opening / closing operation, the shutter blades 31 and the like continue to receive an impact while abutting against the stoppers 10h and 10i installed on the main plate 10.

  Therefore, in order to alleviate the impact of each shutter blade 31 and the like, in this embodiment, as shown in FIGS. 6 and 8, the shutter blade 31 and the like are at the tip of the drive lever 40 before contacting the stoppers 10h and 10i. The permanent magnets (second magnet part) 50a and the permanent magnets (first magnet parts) 50b and 50c arranged on the base plate 10 so that the same poles magnetically interfere with each other during the opening / closing operation are magnetic characteristics of the same poles. Cause a repulsion phenomenon. The repulsive force generated at this time adjusts the magnetic characteristics of the permanent magnet 50 so that the shutter blades 31 and the like interlocked with the drive pin 41c can come into contact with the stoppers 10h and 10i.

  As a result, the drive speed of the drive pin 41c of the rotor 41 is temporarily reduced (decelerated), and the drive speed of the interlocking shutter blades 31 and the like is also reduced. As the driving speed is reduced, the impact force generated when the shutter blades 31 and the like come into contact with the stoppers 10h and 10i can be reduced. Therefore, breakage and damage to the shutter blades 31 and the like can be reduced. As a result, it is possible to extend the life of the light amount adjusting device or stabilize the light amount adjusting function (performance).

  As mentioned above, although this invention was demonstrated in detail based on one Embodiment, this invention is not limited to one Embodiment mentioned above.

  In the above-described embodiment, the case where the operation of the rotor 41 is controlled using the repulsive force between the same magnetic poles has been described. However, the present invention is not limited to this, for example, the ground plane 10, the electromagnetic actuator 40, The configuration of the shutter blade 30 is the same. As shown in FIG. 9, when the rotor 41 closes by reversing the N pole S pole of the permanent magnet 50 c and using a different polarity adsorption force, the rotor 41 ( The permanent magnet 50a installed at the tip of the drive pin 41c) and the permanent magnet 50c arranged so as to cause magnetic interference between the N poles and the S poles during the closing operation cause an attraction phenomenon that is a magnetic characteristic of the different poles. May be. In this case, the magnetic characteristics are adjusted so that the attraction phenomenon occurs before the ridgelines 32e and 33e of the shutter blades 32 and 33 pass each other before reaching the closed state. The driving speed of the rotor 41 is improved by the suction phenomenon, and the operating speed of each shutter blade 31 and the like linked thereto is also improved. Therefore, it is possible to improve the speed of closing the shutter blade, which is an important function of the light amount adjusting device. is there.

  In the above-described embodiment, the operation of the rotor 41 is controlled in consideration of the timing when the shutter blades 31 and the like come into contact with the stoppers 10h and 10i. However, the present invention is not limited to this, and the rotor 41 is not limited thereto. This drive pin 41c can also be applied to a structure in which the travel of the shutter blades is stopped by abutting against one end or both ends of a through hole (pin insertion hole) provided through the base plate 10. In other words, the operation of the rotor 41 may be controlled by a magnetic action in order to reduce the bounce operation that can be generated by the impact of contacting the drive pin 41c with the end of the through hole. In this case, when the drive pin 41c is brought into contact with one end portion of the through hole, a magnetic repulsive force may be generated on the rotor 41 in a direction away from the one end portion of the through hole. On the contrary, the drive pin 41c may be stopped at one end portion of the through hole by using a magnetic attractive force.

  In the above-described structure, the permanent magnets that accelerate and decelerate the drive of the rotor 41 are arranged so that the rotor 41 is opposed to the end of opening and closing. However, the present invention is not limited to this, for example, the rotor 41 If it arrange | positions so that it may affect the acceleration / deceleration of this, the arrangement position will not ask | require.

  Furthermore, in the above-described embodiment, the example in which the repulsive force is adjusted so that each shutter blade 31 abuts against the stoppers 10h and 10i has been described. However, the present invention is not limited to this, and for example, the repulsive force is limited. It is also possible to provide a repulsive force that does not allow the shutter blades 31 and the like to come into contact with the stoppers 10h and 10i.

  In the structure example described above, the rotor is accelerated and decelerated using the magnetic characteristics of the permanent magnet with two poles. However, if the rotor can be accelerated and decelerated, the number of poles and the structure of the permanent magnet are limited. There is no. Further, the number of the shutter blades 31 and the like is not limited to four, and at least one is sufficient if the opening can be fully closed.

10 Base plate 10a, 10b Permanent magnet insertion hole 10c, 10d, 10e, 10f, 10g Support shaft 10h, 10i Stopper 10j Opening portion 20 Pressing member 20a Opening portion 30 Shutter blade 31 First shutter blade 32 Second shutter blade 33 Third shutter Blade 34 Fourth shutter blade 31a, 32a, 33a, 34a Circular holes 31b, 32b, 33b, 34b Long holes 31c, 32c, 33c, 34c Closed stopper edges 32e, 33e Diameter ridge 40 Electromagnetic actuator 41 Rotor 41a Permanent magnet insertion hole 41b Hole 41c Drive pin 42 Coil 43 Yoke 44 Yoke pressing member 45 Screw 1
46 Screw 2
50 Permanent magnet 50a Drive lever tip installation 50b Ground plate installation 1
50c 2 for ground plane installation

Claims (9)

An opening forming member that forms an opening through which light passes;
A blade entering and exiting the opening;
A power transmission member that engages with the blade and reciprocates within a predetermined range, and transmits power to the blade;
A blade drive device that controls the operation of the drive transmission member by causing a magnetic repulsion or adsorption action to the power transmission member during the reciprocating operation of the power transmission member that reciprocates. . The opening forming member is provided with a through hole in which a drive pin of the power transmission member is inserted and reciprocated,
During the turning operation of the power transmission member, when the drive pin is brought into contact with one end portion of the through hole, the drive pin is magnetically moved with respect to the drive transmission member in a direction away from the one end portion of the through hole. The blade driving device according to claim 1, wherein a repulsive force is generated.   During the folding operation of the power transmission member, the first magnet portion provided in the opening forming member and the second magnet portion provided in the power transmission member are brought close to each other so that magnetic repulsion or adsorption is achieved. The blade driving device according to claim 1, wherein the operation of is temporarily generated.   A magnetic repulsion action is generated on the same pole side of the first magnet portion provided in the opening forming member and the second magnet portion provided in the power transmission member, and the operation of the power transmission member is decelerated. The blade driving device according to claim 1, wherein the blade driving device is controlled as follows.   A magnetic adsorption action is generated on the opposite side of the first magnet portion provided in the opening forming member and the second magnet portion provided in the power transmission member, and the operation of the power transmission member is stopped. The blade driving device according to claim 1, wherein the blade driving device is controlled as follows.   The power transmission member has a rotation center shaft for turning the drive pin engaged with the engagement hole of the blade, and the opening of the power transmission member provided with the drive pin has the opening The blade driving device according to any one of claims 1 to 5, wherein a second magnet portion that acts magnetically with the first magnet portion provided on the forming member is embedded.   The said blade | wing is provided with two or more with respect to the said one opening part, Each said engagement hole of the said blade | wing is inserted in common with respect to the said one drive pin, The Claim 6 characterized by the above-mentioned. The blade drive device described.   A shutter device comprising the blade driving device according to claim 1.   An imaging apparatus comprising the blade driving device according to claim 1.

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