JP6563692B2 - Blade driving device, light amount adjusting device, and imaging device - Google Patents

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 light amount adjustment 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 when the shutter blade is brought into contact with a stopper or the like to stop the operation of the shutter blade, or a member that transmits power to the blade is applied to the stopper or the like. It may occur in the same way when touching.

  The present invention provides a blade driving device, a light amount adjusting device, and an imaging device that can realize a highly accurate blade driving by reducing a bounding operation.

Blade drive device of the present invention, the opening forming member for forming an opening through which light passes, and out of the opening, and the blade to have a engaging hole, the engaging pin to be engaged with the engagement hole There is erected, and a power transmission member for transmitting power to the blade, against the abutment portion provided in the opening forming member, part of the power transmitting member, or the engaging pin, or of the vane Impact mitigation that relieves impact at the time of abutment against the abutment portion by retreating in a direction intersecting the movement direction of the engagement pin by sliding the engagement pin at a timing before abutting either Means.
According to this aspect of the present invention, since the bounce operation is reduced by effectively suppressing unnecessary power to the blades directly or indirectly by the impact relaxation means at the position where the blades should stop, Drive with precision.
Moreover, according to this aspect of the present invention, the impact mitigating means acts on the engaging pin of the power transmission member, so that the bounce operation can be effectively reduced.
In the wing drive device of the present invention, an opening forming member that forms an opening through which light passes, a blade that enters and exits the opening, and an engagement pin is erected, and the engagement pin are engaged. A power transmission member that transmits power to the blades and a contact portion provided in the opening forming member, a part of the power transmission member, or the engagement pin, or At the timing before any of the blades is brought into contact, the engagement pin slides to retreat in a direction intersecting the moving direction of the engagement pin, thereby reducing the impact at the time of contact with the contact portion. And an impact mitigating means.
According to this aspect of the present invention, since the bounce operation is reduced by effectively suppressing unnecessary power to the blades directly or indirectly by the impact relaxation means at the position where the blades should stop, Drive with precision.
Moreover, according to this aspect of the present invention, the impact mitigating means acts on the engagement pin of the blade, so that the bounce operation can be effectively reduced.

In the present invention, the impact mitigating means is configured to be in sliding contact with the engaging portion of the blade and the power transmission member after the blade has covered the opening. Also good.
According to this aspect of the present invention, the state in which the blades close the opening can be maintained.

In the present invention, the impact reducing means includes a sliding contact member with which the engaging portion slides, and a biasing spring that biases the sliding contact member so as to advance and retreat in one direction. The biasing spring may be compressed when the portion is in sliding contact with the sliding contact member, and the impact of the engagement portion coming into contact with the contact portion may be reduced.
According to this aspect of the present invention, the bounce operation can be effectively reduced by using the compressive force of the biasing spring.

The blade drive device of the present invention includes an opening forming member that forms an opening through which light passes, a blade that is provided on one side of the opening forming member, and enters and exits the opening, and the opening forming member. Driving means provided on the other surface side for driving the blade, and the driving means is inserted from the other surface side of the opening forming member into the elongated hole provided in the opening forming member, and An engagement pin that is movably provided along the long hole and engages with an engagement hole provided in the blade on one surface side of the opening forming member; The engagement pin that protrudes into the elongated hole from the periphery of the abutting portion that is one end of the elongated hole with which the engaging pin abuts, and the engaging pin that moves in the elongated hole contacts the abutting portion. In the moving direction of the engaging pin by sliding contact at the previous timing It characterized retracted in a direction crossing with that having a shock absorbing means to alleviate the impact during abutment against the abutment portion.
According to this aspect of the present invention, the bounce operation can be reduced by sliding the engagement pin against the impact relaxation means before the engagement pin contacts the one end (contact portion) of the elongated hole.

In the present invention, the opening forming member is provided with a blade contact portion that contacts an end of the blade on the opposite side of the blade movement direction from the opening side. The timing of contact with the contact portion may be after the engagement pin is in sliding contact with the impact relaxation means.
According to this aspect of the present invention, since the engaging pin is in sliding contact with the impact reducing means before the blade comes into contact with the blade contact portion, the impact when the blade comes into contact with the blade contact portion is reduced. , And the durability of the blades is improved.

Further, in the present invention, the engagement pin may come into contact with one end portion of a cam hole which is an engagement hole of the blade after slidingly contacting the impact mitigating means.
According to this aspect of the present invention, the load on the engagement hole of the blade can be reduced.

Note that the present invention can also be widely applied to a light amount adjusting device such as a shutter device including the above-described blade driving device, or an imaging device such as a camera including the above-described blade driving device.
According to this aspect of the present invention, since the blade driving device in which the bounding operation is effectively reduced is mounted, high-precision blade driving can be realized, and high-precision light amount adjustment or high-precision imaging processing can be realized.

  According to the present invention, it is possible to realize a blade driving device, a light amount adjusting device, and an imaging device that can realize a highly accurate blade driving by reducing a bounding operation.

The disassembled perspective view of the blade | wing drive device (light quantity adjustment apparatus) which concerns on one Embodiment of this invention. The external appearance top view which shows the principal part of FIG. The external appearance top view which shows the principal part back side of FIG. The expanded sectional view of FIG. The top view which shows a blade | wing full open state. The figure which shows the relationship between the rotor and pin at the time of the fully open state of FIG. The top view which shows a blade closed state. FIG. 8 is a detailed view showing the relationship between the rotor and the spring in the blade closed state of FIG. 7. The top view which shows the fully closed state which the blade | wing contacted the stopper of the main plate. The figure which shows the relationship between the rotor of a blade | wing full-closed state of FIG. 9, and a spring.

  The blade driving device according to the present invention is configured so that the blade and the power transmission are performed at a timing before either the blade or the power transmission member that transmits power to the blade is brought into contact with the contact portion provided in the opening forming member. The bounce operation is reduced by bringing the impact relaxation means into sliding contact with the engaging portion of the member.

  More specifically, an opening forming member that forms an opening through which light passes, a blade that enters and leaves the opening, a power transmission member that engages the blade and transmits power to the blade, the blade, and power transmission And an impact mitigating means that slidably contacts the engaging portion of the member and retracts. In order to effectively reduce the bounce motion finally transmitted to the blades, the impact mitigation means mitigates, for example, one of the causes of the bounce motion, which is a physical impact generated in the power transmission process, that is, an opening forming member. It is a means for decelerating the speed immediately before contact with the contact portion provided in the contact.

  For example, the impact of the engaging portion of the blade and the power transmission member, or the engagement portion of the blade or the power transmission member before the contact with the contact portion provided on the opening forming member is reduced. Make sliding contact with the means. In addition, the contact part which contact | abuts the engaging part of a blade | wing and a power transmission member and the contact part which contact | abuts a blade | wing become separate contact parts provided in the opening formation member. For example, the blade contact portion for contacting the blade and the engagement contact portion for contacting the engagement portion are provided at different positions of the opening forming member.

  With these configurations, for example, it is possible to alleviate the physical impact that occurs during the reciprocating operation of the blades within a predetermined range, particularly at the time of folding, and to reduce the bounce operation transmitted to the blades thereafter. Therefore, when the blades are operated at high speed, bounce is likely to occur. In such a case, it is very effective to apply the present invention, and the durability of the blades can be improved.

  Here, the “engagement portion of the blade and the power transmission member” means, for example, the engagement of the power transmission member when engaging the engagement pin standing on the power transmission member and the engagement hole of the blade. It corresponds to a pin and corresponds to an engagement pin of a blade when engaging an engagement pin standing on the blade and an engagement hole of the power transmission member.

  Further, the contact portion (engagement contact portion) for contacting the blade and the engagement portion of the power transmission member may be provided, for example, in an opening forming member that forms an opening through which the blade enters and exits. You may provide in members other than a formation member. In the former case (when the contact portion is provided on the opening forming member), for example, a through hole that penetrates the opening forming member is provided, and the engaging pin is inserted in the through hole. Can be brought into contact with one end of the through hole. In this case, one end of the through portion is an example of the contact portion. Note that the contact portion is not limited to the form of the through hole provided in the opening forming member, and may be formed by, for example, a part of the opening forming member cut out.

  Furthermore, the contact portion (blade contact portion) for contacting the blade may be provided integrally with the opening forming member, or provided on another member such as a stopper rubber joined to the opening forming member. Also good. In addition, you may provide a blade contact part and an engagement contact part in an opening formation member, respectively. In that case, after the blade is in contact with the blade contact portion, the engagement pin may be in contact with the engagement contact portion, or vice versa. .

  In any case, in the present invention, before the timing at which the blade is brought into contact with the blade contact portion or the engagement pin (engagement portion) is brought into contact with the engagement contact portion, the impact mitigating means is provided. On the other hand, the bounce operation transmitted to the blades can be reduced by sliding the blades and the engaging portions of the power transmission members in sliding contact to alleviate the impact at the time of subsequent contact.

  Hereinafter, a camera shutter device (an example of a light amount adjusting device) using a blade driving device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  1 to 4 show the configuration of a camera shutter 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 and a press plate 20 having opening portions 10e and 20a for exposure, and shutter blades (hereinafter also referred to as blades) that open and close these opening portions 10e and 20a. ) 30 and an electromagnetic actuator 40 as an electromagnetic drive source for driving the shutter blade 30.

  The base plate 10 is provided with an opening 10e for exposure, and the press plate 20 is provided with an opening 20a. These openings 10e and 20a are portions through which light passes. The plate 20 serves as an opening forming member that forms the opening.

As shown in FIGS. 1 and 2, the base plate 10 has a predetermined opening or more when the opening 10 e for exposure, the supporting shafts 10 a and 10 b for supporting the shutter blade 30, and the shutter blade 30 move to the opening or closing side. Stoppers 10b and 10c are formed as restricting members that restrict the movement of. These stoppers 10 c and 10 d serve as contact portions with which the shutter blade 30 contacts.

  Further, the electromagnetic actuator 40 attached to the main plate 10 serves as a driving means for driving the shutter blade 30 and is magnetized to the N pole and the S pole and rotatable within a predetermined angle range as shown in FIGS. The rotor 41 is supported by the rotor 41, the exciting coil 42, and a yoke 43 forming a magnetic circuit.

  The rotor 41 is integrally formed with a drive pin 41a connected to the shutter blade 30 at a position that is not coaxial with the rotation center. As shown in FIGS. 1, 2, 3, 5, 7, and 9, the shutter blade 30 includes a first shutter blade 31 and a second shutter blade 32. The first and second shutter blades 31 and 32 are formed with circular holes 31a and 32a and elongated holes 31b and 32b, respectively.

The support shafts 10b and 10a of the main plate 10 are inserted into the circular holes 31a and 32a, and the first shutter blade 31 and the second shutter blade 32 are rotatably supported. Incidentally, long hole 31b, the 32b drive pin 41 a is inserted. The drive pin 41 a is erected on the rotor 41, and power is transmitted to the shutter blades 30 as the rotor 41 rotates. Therefore, the rotor 41 serves as a power transmission member that transmits power to the shutter blades 30.

  As the rotor 41 rotates, the shutter blades 30 come close to each other and return to the standby position from the standby position shown in FIG. 5 as shown in FIG. It rotates so that it may space apart, and it opens and closes opening part 10e, 20a by both cooperation work. FIG. 9 shows a state in which the shutter blade 30 has covered the opening 10e.

Further, as shown in FIG. 4, pins 51 are inserted into the pin insertion holes 10 f of the base plate 10. Further, as shown in FIG. 4, a spring (biasing spring) 50 is inserted into the spring insertion hole 10 g of the base plate 10. This pin 51 is inserted into an elongated through hole provided in the base plate 10, and is a drive pin for the rotor 41 disposed on the other surface side of the base plate 10 with respect to the shutter blade 30 disposed on the one surface side of the base plate 10. 41a engages through a through-hole.

Then, the driving pin 41 a is moved along the through hole is brought into sliding contact with the pin 51 at one end side of the through hole. More specifically, the tip portion of the pin 51 protrudes into the through hole at a position before coming into contact with one end portion of the through hole, and the drive pin 41 a moving toward the one end portion of the through hole is formed through the through hole. Immediately before coming into contact with one end of the hole, it comes into sliding contact with the tip of the pin 51. At this time, the protruding direction of the pin 51 is a direction that intersects the movement direction of the drive pin 41 a. Thus, the drive pin 41 a is when sliding contact with the pin 51, the pin 51 is retracted towards the outside of the through hole.

In the present embodiment, the pin 51 is in sliding contact with the drive pin 41 a when become fully closed state illustrated in FIGS. At this time, since the pin 51 is urged by the spring 50, the pin 51 is retracted in the direction in which the spring 50 is compressed. Therefore, pin 51 and spring 50, the impact when the drive pin 41 a comes into contact with one end of the through hole, a means to relax by prior sliding action (an example of a shock absorbing means). In the present embodiment, the timing drive pin 41 a comes into contact with the end portion of the through hole, and a timing shutter blade 30 abuts against the stopper 10b, 10c was set to be at the same time.

Thus, when fully closed by the shutter blade 30, the physical impact when the drive pin 41 a comes into contact with one end of the through hole, the drive pin 41 a is brought into sliding contact with the pre relative to the pin 51 Thus, the shutter blade 30 in the fully closed state can be effectively prevented from bouncing. Accordingly, since the fully closed state can be maintained, re-exposure and the like can be effectively prevented.

On the other hand, in the present embodiment, when moving toward the other end of the drive pin 41 a from one end of the through hole, i.e., when the fully open state shown in FIGS. 5 and 6, the pin 51 is driven pin 41 a the act temporarily, while others never pin 51 acts on the driving pin 41 a. That is, as shown in FIGS. 5 and 6, when the shutter blade 30 is in the driving range to a position as possible closed from the fully open position opening the opening portion 10e, the drive pin 41 a of the rotor 41 is in contact with the pin 51 ( Drive without action).

As shown in FIGS. 7, 8, 9, and 10, in this embodiment, in the driving range from the position where the shutter blade 30 is fully closed to the position where the shutter 10 is fully closed, the rotor 41 is moved. The drive pin 41 a comes into contact with the pin 51 and reaches the fully closed state while receiving the biasing force of the spring 50. Here, “completely closed” means a state in which the shutter blade 30 covers the opening 10e of the base plate 10 and completely blocks light.

  When the shutter blade 30 is fully closed, the edges 31c and 32c provided on the first shutter blade 31 and the second shutter blade 32 are in contact with the stoppers 10d and 10c provided on the main plate 10, and when the shutter blade 30 is fully opened. When the edge portions 31d and 32d provided on the first shutter blade 31 and the second shutter blade 32 abut against the stoppers 10c and 10d, the opening / closing operation range of the shutter blade 30 is restricted.

  Thus, when the shutter blade 30 is fully closed in the closing operation, the shutter blade 30 is decelerated by the urging force of the spring 50 from the fully closed position to suppress the impact on the shutter blade when fully closed. Therefore, the durability performance can be improved, and it is very advantageous against the bound of the shutter blade 30.

  Note that, as described above, the biasing force of the spring 50 works outside the range of the light quantity change, so that the change in the light quantity is not affected by the mounting of the spring 50.

  In the shutter device according to the embodiment described above, the spring 50 is employed as the elastic member for the purpose of deceleration in the closed travel of the shutter blade 30. However, the present invention is not limited to this, and an elastic body other than the spring is used. May be adopted. Further, the number of shutter blades 30 is not limited to two. For example, when the opening can be fully closed, at least one shutter blade 30 is sufficient.

As mentioned above, although this invention was demonstrated in detail based on one Embodiment, this invention is not limited to one Embodiment mentioned above.
For example, in the above-described embodiment, the structure in which the present invention is applied to driving the shutter blades has been described. However, the present invention is of course not limited thereto, and the present invention may be applied to driving blades other than the shutter blades. . More specifically, the present invention is applied to a case where a blade provided with an optical filter is driven, a case where an optical filter is driven as a blade, or a blade provided with an opening smaller than the opening of an opening forming member. These various blades may be used in combination.

  Further, in the above-described embodiment, the bounce operation is prevented when the opening through which the light passes is completely closed. However, the present invention is of course not limited to this. For example, the opening through which the light passes is closed. You may apply so that the bound operation | movement accompanying the blade | wing stop operation | movement at the time of fully opening from a complete state may be prevented. Specifically, in the state shown in FIG. 2, that is, the timing before the blade is brought into the fully open state and brought into contact with the stopper, the state shown in FIG. 8, that is, the drive pin 41a for driving the blade 30. Is made to slide in contact with the pin 51 that can advance and retreat (impact mitigating member similar to the above-described embodiment), it is possible to effectively prevent the bounce operation when stopping the blade 30 in the fully opened state.

DESCRIPTION OF SYMBOLS 10 Base plate 10a, 10b Support shaft 10c, 10d Stopper 10e Opening part 10f Pin insertion hole 10g Spring insertion hole 20 Holding member 20a Opening part 30 Shutter blade 31 First shutter blade 31a Circular hole 31b Long hole 31c Closed stopper edge 31d Opening Stopper edge portion 32 Second shutter blade 32a Circular hole 32b Long hole 32c Closed stopper edge portion 32d Opening stopper edge portion 40 Electromagnetic actuator 41 Rotor 41a Drive pin 41b Hole 42 Coil 43 Yoke 44 Yoke holding member 45 Screw 50 Spring 51 Pin ( Part of impact mitigation means)

Claims (9)

An opening forming member that forms an opening through which light passes;
And out of the opening, and the blade to have a engaging hole,
An engagement pin that is engaged with the engagement hole, and a power transmission member that transmits power to the blade;
Against the abutment portion provided in the opening forming member, part of the power transmitting member, or the engaging pin or, one of the wings at a timing prior to contact, the engaging pin is slidable An impact mitigating means that retreats in a direction intersecting with the moving direction of the engagement pin by contacting to mitigate an impact at the time of contact with the contact portion;
A blade driving device comprising: An opening forming member that forms an opening through which light passes;
A vane that goes into and out of the opening and is provided with an engaging pin;
A power transmission member having an engagement hole with which the engagement pin is engaged, and transmitting power to the blade;
The engagement pin slides at a timing before a part of the power transmission member, the engagement pin, or the blade is brought into contact with the contact portion provided in the opening forming member. An impact mitigating means that retreats in a direction intersecting with the moving direction of the engagement pin by contacting to mitigate an impact at the time of contact with the contact portion;
A blade driving device comprising: 3. The blade driving device according to claim 1, wherein the impact relaxation means is configured to be in sliding contact with the engagement pin after the blade has covered the opening. 4. The impact mitigating means includes a sliding contact member with which the engaging pin slides, and a biasing spring that biases the sliding contact member so as to advance and retreat in one direction, and the engaging pin is attached to the sliding contact member. the biasing spring is compressed when the sliding contact, the blade drive according to any one of claims 1 to 3 wherein the engagement pin, wherein said that the contact portion in contact with the impact is relaxed apparatus. An opening forming member that forms an opening through which light passes;
A blade provided on one side of the opening forming member and entering and exiting the opening;
A driving means provided on the other surface side of the opening forming member for driving the blade;
With
The driving means is inserted from the other surface side of the opening forming member with respect to the long hole provided in the opening forming member, is provided movably along the long hole, and is provided on the blade. An engagement pin that engages with the hole on one side of the opening forming member;
Further, the engagement pin that protrudes into the elongated hole from the periphery of the abutting portion that is one end of the elongated hole with which the engaging pin abuts among the opening forming member, and moves within the elongated hole. Impact relaxation means for relieving the impact at the time of contact with the contact portion by retreating in a direction intersecting the moving direction of the engagement pin by sliding contact at a timing before contact with the contact portion. A blade driving device comprising: The opening forming member is provided with a blade abutting portion with which an end of the blade on the opposite side of the blade moving direction from the opening side abuts.
The blade driving device according to claim 5 , wherein the timing when the blade comes into contact with the blade contact portion is after the engagement pin is in sliding contact with the impact reducing means. The blade driving device according to claim 5 or 6 , wherein the engagement pin comes into contact with one end portion of a cam hole which is an engagement hole of the blade after slidingly contacting the impact reducing means. A light quantity adjusting device comprising the blade driving device according to any one of claims 1 to 7 . Imaging apparatus characterized by comprising a blade drive device according to any one of claims 1 to 7.

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