JP2011197082A - Blade driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade driving device enabled in the miniaturization of the outer diameter direction and the thinning of the optical axis direction by making an auxiliary member have a plurality of functions.SOLUTION: A blade chamber is constituted of a shutter plate 1 having an opening 1a and a cover plate 2 having an opening 2a so that these openings overlap each other. In the blade chamber, there are arranged: an aperture blade 5 having an opening 5a for regulating a small aperture diameter; shutter blades 7, 8 and 9; and an aperture auxiliary blade 6 that is arranged between the aperture blade 5 and the shutter blades 7, 8 and 9, and has an opening 6a that has an aperture larger than that of the opening 5a and is arranged at a position overlapping the openings 1a and 2a. A blade drive actuator 4 operates the aperture auxiliary blade 6 so that the aperture auxiliary blade 6 covers a gap formed between the aperture blade 5 and edges of the openings 1a and 2a when the opening 5a of the aperture blade 5 is made to enter the opening 6a.

Description

  The present invention relates to a small blade driving device that is most suitable for a digital camera, particularly a digital camera built in a small portable device.

  The conventional lens shutter aperture mechanism is such that when photographing with an aperture smaller than the exposure aperture, that is, with a small aperture diameter, the small aperture member completely blocks the exposure aperture except for the small aperture aperture diameter. Therefore, the small aperture member has an outer shape larger than at least the exposure opening. For this reason, when not photographing with a small aperture diameter, it is necessary to retract the small aperture member from the exposure opening and store it between the side edge of the exposure opening and the outer edge. The area is restricted by the size of the small aperture member on which the small aperture diameter is formed, and the radial dimension cannot be reduced by any means.

  Further, as a demand for thinning, in the lens shutter unit in the photographing lens group in order to shorten the lens length, the distance between the front lens end on the subject side and the aperture member on the subject side from the shutter, and the rear group lens on the image plane side from the shutter It arrange | positions so that the distance of an edge and a shutter member may be closely approached. For this reason, the distance between the front group lens end and the diaphragm blade and the distance between the rear group lens end and the shutter blade are reduced, so that the cover plate facing the front group lens side and the shutter base plate facing the rear group lens side are exposed. A technique is adopted in which the diameter around the exposure opening is reduced by increasing the diameter of the opening and escaping the lens end. The optical aperture diameter is provided on a partition plate that separates the aperture member and the shutter member.

  In recent years, further downsizing of digital cameras has been demanded, and lens shutters mounted on digital cameras are inevitably required to be downsized and thinned. In particular, there is a strong demand for further miniaturization and thinning of digital cameras mounted on mobile phones, and there is a demand for minimizing the projection area of the lens in the optical axis direction. For this reason, the lens shutter is not in the shape of a circle centered on the optical axis as in the case of a conventional lens shutter, but must be a lens shutter having an irregular shape with an asymmetrical optical axis.

  FIG. 26 is a diagram for explaining the structure of a conventional general blade driving device built in a portable device. FIG. 27 is a partial cross-sectional view showing the structure of a conventional general blade driving device built in a portable device. This blade driving device includes shutter blades 7, 8, and 9 that realize a shutter function, a diaphragm blade 5 that realizes a light quantity control function, and a diaphragm auxiliary blade 6 between a shutter base plate 1 and a cover plate 2. . The shutter blades 7, 8, 9, the diaphragm blade 5, and the diaphragm auxiliary blade 6 are partitioned by a partition plate 13. That is, the conventional blade driving device forms a blade chamber between two ground plates, and arranges a shutter blade and a diaphragm blade in the blade chamber, and arranges a partition plate between the diaphragm blade and the shutter blade. In general, the blades are configured such that the blades do not interfere with each other when the blades are operated (see, for example, Patent Documents 1 and 2).

  Nowadays, further downsizing of portable devices is required. For this reason, in digital cameras built in portable devices, demands for miniaturization such as a reduction in the projection area (outer diameter of the ground plane) in the optical axis direction and a reduction in thickness become stronger, and the blade drive device is similarly reduced in size. The need has increased. Therefore, the size of each blade is reduced (the width in the operation direction) so that the accommodation area of the blade when retracted from the opening is reduced to reduce the size in the diameter direction of the aperture, and the aperture blade and the shutter blade There is a technology that promotes thinning in the optical axis direction by eliminating the partition plate disposed between the two (see, for example, Patent Documents 3 and 4).

  Moreover, the method of fixing the blade drive actuator in the conventional blade drive device is complicated because the entire assembly is fixed with screws using a press plate formed separately after the yoke is assembled to the bobbin. Because of the large number of parts, there are problems such as an increase in parts management costs and an increase in manufacturing costs. Therefore, in order to solve such a problem, a technique has been proposed in which the number of parts for assembling is reduced or the assembling work is simplified to reduce parts management costs, manufacturing costs, etc. (for example, And Patent Documents 5 to 8).

Japanese Patent No. 3954349 Utility Model Registration No. 2521238 JP 2002-14387 A JP 2002-139765 A Japanese Patent No. 4163904 JP 2009-53433 A JP 2006-33914 A JP 2008-139405 A

  The techniques described in Patent Documents 3 and 4 have succeeded in eliminating the partition plate that has been a major factor that hinders thinning in the optical axis direction. However, the problem is that a gap is formed between the aperture blade and the edge of the exposure aperture when a diaphragm blade having a small aperture diameter is introduced into the exposure aperture diameter. Therefore, there is a problem that the thickness in the optical axis direction is increased by the amount of the new member added.

  In the techniques described in Patent Documents 5 to 8, the number of parts is reduced by integrating several parts, or a bobbin, a yoke, or the like is fixed to the blade driving device by heat melting or adhesion. In this way, the assembly work is simplified, and the parts management cost and the manufacturing cost are reduced. However, such a conventional technique is not suitable for an extremely small blade driving device used for a digital camera mounted on a mobile phone or the like because there is no space or size for inserting a fixing screw. In addition, mounting by heat melting or adhesion is convenient for reducing the thickness of the device or providing durability such as a drop impact, but it is impossible to disassemble and reassemble the device for repair etc. There is an inconvenience.

  In order to eliminate the above-described problems caused by the prior art, the present invention provides a blade drive device that can be thinned in the optical axis direction as well as in the outer diameter direction by providing the auxiliary member with a plurality of functions. The purpose is to provide. It is another object of the present invention to provide a blade driving device that reduces the number of parts for assembly, is easy to assemble and disassemble, and has durability against impacts such as dropping.

  In order to solve the above-described problems and achieve the object, the blade driving device according to the present invention can be operated in the blade chamber by two ground plates constituting a blade chamber between the two openings so as to overlap each other. A diaphragm blade having a diaphragm aperture that restricts a small diaphragm aperture, a shutter blade disposed in the blade chamber, and disposed between the diaphragm blade and the shutter blade in the blade chamber. An auxiliary member having an exposure opening that is disposed at a position where the aperture is large and overlaps with the opening, diaphragm blade driving means for driving the diaphragm blade so as to advance and retract the diaphragm opening with respect to the exposure opening, and the shutter Shutter blade driving means for driving the shutter blade so that the blade opens and closes the exposure opening, and the auxiliary member is moved forward by the diaphragm blade driving means. The diaphragm blade driving means is provided so as to be operable in accordance with the driving of the diaphragm blades, and the diaphragm blade driving means, when the diaphragm opening of the diaphragm blades enters the exposure opening, the aperture member and the opening portion by the auxiliary member. The auxiliary member is operated so as to cover a gap formed between the edges of the auxiliary member.

  In the blade driving device according to the present invention, the diaphragm blade driving means is attached to one of the ground plates outside the blade chamber, and the shutter blade driving means is attached to the other ground plate outside the blade chamber. The diaphragm blade driving means and the shutter blade driving means are arranged at positions where at least a part thereof overlaps in a direction orthogonal to the optical axis.

  The blade drive device according to the present invention is a U-shape in which the blade chamber is formed of a nonmagnetic metal material having elasticity together with the diaphragm blade drive means and the shutter blade drive means attached to the outside. It is fixed by the clip of this.

  Furthermore, the blade driving device according to the present invention has a sliding surface formed on the inner surface of the blade chamber that protrudes from the base surface of the main plate, and includes one of the diaphragm blade, the auxiliary member, and the shutter blade. The thrust direction of the member is regulated by sliding the surface of the part while contacting the sliding surface.

  According to the blade driving device of the present invention, the auxiliary member functions as a partition plate for partitioning the storage region of the diaphragm blade and the shutter blade disposed in the blade chamber, and the diaphragm blade enters the exposure opening diameter. The projection area (outer diameter of the ground plane) in the optical axis direction can be reduced and the optical axis can be reduced because it is configured to operate so as to cover the gap between the aperture blade formed at the time of exposure and the edge of the exposure opening. There is an effect that the direction can be reduced in thickness. In addition, since an elastic clip is used to fix the blade chamber, the number of parts for assembly can be reduced, assembly and disassembly are easy, and durability against impact such as dropping can be provided. There is an effect. Further, a sliding surface of each blade is formed inside the blade chamber, and the operation time of the shutter blade varies due to a difference in camera posture by sliding each blade in contact with the sliding surface. Can be eliminated, and uneven exposure can be prevented.

It is the front view seen from the to-be-photographed object side for demonstrating the structure of the blade chamber of the blade drive device concerning Embodiment 1. FIG. It is the front view seen from the to-be-photographed object side for demonstrating the structure of the blade chamber of the blade drive device concerning Embodiment 1. FIG. It is the front view seen from the to-be-photographed object side for demonstrating the structure of the blade chamber of the blade drive device concerning Embodiment 1. FIG. It is a fragmentary sectional view which follows the AA line of FIG. It is a figure for demonstrating the assembly process of the blade drive device concerning Embodiment 1. FIG. It is a figure for demonstrating the assembly process of the blade drive device concerning Embodiment 1. FIG. It is the front view seen from the to-be-photographed object side which shows the state which attached the blade drive actuator to the cover board. It is the front view seen from the image side which shows the state which attached the blade drive actuator to the shutter base plate. It is a figure for demonstrating the function of the clip for fixing the blade | wing drive device concerning Embodiment 1. FIG. It is the front view seen from the to-be-photographed object side which shows the state which fixed the blade | wing drive device concerning Embodiment 1 with the clip. It is the front view seen from the image side which shows the state which fixed the blade | wing drive device concerning Embodiment 1 with the clip. FIG. 5 is a diagram for explaining the mounting of the shutter driving flexible board to the blade driving device according to the first embodiment; It is the front view seen from the to-be-photographed object side which shows the state with which the shutter drive flexible substrate was mounted | worn with the blade | wing drive device concerning Embodiment 1. FIG. It is the front view seen from the image side which shows the state with which the shutter drive flexible substrate was mounted | worn with the blade | wing drive device concerning Embodiment 1. FIG. It is a figure for demonstrating the action | operation of the blade | wing drive device concerning Embodiment 1. FIG. It is a figure for demonstrating the action | operation of the blade | wing drive device concerning Embodiment 1. FIG. It is a figure for demonstrating the action | operation of the blade | wing drive device concerning Embodiment 1. FIG. It is a figure which shows the inner surface (subject side surface) of the shutter base plate which comprises the blade chamber of the blade drive device concerning Embodiment 2. FIG. It is the perspective view seen from the to-be-photographed object side which shows the structure of the blade chamber of the blade drive device concerning Embodiment 2. FIG. It is a figure which shows the inner surface (image side surface) of the cover board which comprises the blade chamber of the blade drive device concerning Embodiment 2. FIG. It is the perspective view seen from the image side which shows the structure of the blade chamber of the blade drive device concerning Embodiment 2. FIG. It is a figure for demonstrating the action | operation of the blade | wing drive device concerning Embodiment 2. FIG. It is a figure for demonstrating the action | operation of the blade | wing drive device concerning Embodiment 2. FIG. It is a figure for demonstrating the action | operation of the blade | wing drive device concerning Embodiment 2. FIG. It is a figure for demonstrating the action | operation of the blade | wing drive device concerning Embodiment 2. FIG. It is a figure for demonstrating the structure of the conventional common blade | wing drive device incorporated in a portable apparatus. It is a fragmentary sectional view which shows the structure of the conventional common blade | wing drive device incorporated in a portable apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a blade driving device according to the present invention will be described in detail with reference to the accompanying drawings. Each of the following embodiments has a diaphragm mechanism and a shutter mechanism as a unit, and is used for a digital camera built in a small portable device such as a cellular phone.

(Embodiment 1)
1 to 3 are front views of the blade chamber of the blade driving device according to the first embodiment as viewed from the subject side.

  As shown in FIG. 1, a circular opening 1 a in which a lens (not shown) is to be disposed is formed slightly below the center of the shutter base plate (first base plate) 1. In addition, hook portions 1b, 1c, and 1d are provided at the lower center of the shutter base plate 1 and at the left and right ends of the upper portion, respectively. The hook portions 1b, 1c, and 1d are used to fix a cover plate (second base plate) 2 described later to the shutter base plate 1. Further, elongated holes 1e and 1m into which blade driving pins 3a and 4a described later are inserted are formed in the upper part of the shutter base plate 1.

  Stoppers 1f, 1g, and 1h are provided on the periphery of the shutter base plate 1. The stoppers 1f, 1g, and 1h serve as stoppers for the blades described later, and function as spacers for forming an interval between the cover plate 2 and the shutter base plate 1 when the cover plate 2 is attached to the shutter base plate 1. Also have. On the upper part of the shutter base plate 1, blade shafts 1i, 1j, 1k, and 11 are provided for axially mounting the blades described later. The blade shafts 1i, 1j, 1k, and 11 are arranged at positions as close as possible to each other so that the blades do not interfere with each other on the projection surface in the optical axis direction even when the blades are driven. The

  First, the hole 9 a of the shutter blade 9 is axially attached to the blade shaft 1 l of the shutter base plate 1. As a result, the shutter blade 9 can be rotated about the blade shaft 11. Further, the hole 8a of the shutter blade 8 is pivotally attached to the blade shaft 1k of the shutter base plate 1 from above. Thereby, the shutter blade 8 can be rotated around the blade shaft 1k. Further, the hole 7a of the shutter blade 7 is pivotally attached to the blade shaft 1j of the shutter base plate 1 from above. As a result, the shutter blade 7 can rotate about the blade shaft 1j. The blade drive pins 4a of the blade drive actuator 4 penetrating the long holes 1m of the shutter base plate 1 are inserted into the long holes 7b, 8b, 9b in a state where the shutter blades 7, 8, 9 are overlapped. When the blade drive pin 4a of the blade drive actuator 4 is driven, the shutter blades 7, 8, and 9 slide with respect to each other.

  Next, as shown in FIG. 2, a hole 6 b of the aperture auxiliary blade 6 is pivotally attached to the blade shaft 1 j of the shutter base plate 1 from above the shutter blade 7. Thereby, the aperture assist blade 6 can be rotated about the blade shaft 1j. From there, the aperture 5b of the aperture blade 5 is pivotally attached to the blade shaft 1i of the shutter base plate 1. Thereby, the aperture blade 5 can be rotated around the blade shaft 1i.

  In the state where the diaphragm blade 5 and the diaphragm auxiliary blade 6 overlap with each other, the blade drive pin 3a of the blade drive actuator 3 that passes through a long hole (not shown) of the cover plate 2 described later is inserted into each of the long holes 5c, 6c. The When the blade drive pin 3a of the blade drive actuator 3 is driven, the diaphragm blade 5 and the diaphragm auxiliary blade 6 slide relative to each other. The aperture auxiliary blade 6 is formed with an opening 6 a having a slightly smaller diameter than the opening 1 a of the shutter base plate 1. This opening 6a becomes the optical aperture diameter. The aperture blade 5 is formed with an opening 5a having a smaller diameter than the opening 6a. This opening 5a becomes a small aperture opening.

  Subsequently, as shown in FIG. 3, the cover plate 2 is attached from above the state shown in FIG. 2. An opening 2 a that is slightly larger than the opening 6 a of the aperture auxiliary blade 6 and is as large as the opening 1 a of the shutter base plate 1 is formed slightly below the center of the cover plate 2. When the cover plate 2 is attached to the shutter base plate 1, the opening 2 a is in a position where the opening 2 a accurately overlaps the opening 1 a of the shutter base plate 1. Further, a shutter abutting reference portion 2d is formed around the opening 2a. Further, attachment claw portions 2b and 2c are formed at both upper end portions of the cover plate 2.

  A stopper 2 e is formed on the back surface of the cover plate 2. The stopper 2e serves as a stopper for each blade, and also has a function as a spacer for forming a gap between the cover plate 2 and the shutter base plate 1 when the cover plate 2 is attached to the shutter base plate 1. In addition, an accommodating portion 2 f that accommodates the bobbin 11 around which the coil 10 is wound is formed on the upper portion of the cover plate 2.

  FIG. 4 is a partial cross-sectional view taken along the line AA of FIG. As shown in FIG. 4, in the blade driving device according to the first embodiment, the operation region (shutter blade chamber) of the shutter blades 7, 8, 9 (shutter member) and the operation region (aperture member) of the diaphragm blade 5 (throttle member). There is no partition plate separating the blade chamber. Therefore, it can be seen that the reduction in thickness in the optical axis direction is significantly promoted as compared with the conventional blade driving device (see FIG. 27).

  Next, a method for assembling the blade driving device according to the first embodiment will be described. 5 and 6 are diagrams for explaining an assembly process of the blade driving device according to the first embodiment. 5 is a perspective view of the blade driving apparatus according to the first embodiment as viewed from the subject side, and FIG. 6 is a perspective view of the apparatus as viewed from the image side. FIG. 7 is a front view seen from the subject side showing a state in which the blade drive actuator is attached to the cover plate. FIG. 8 is a front view seen from the image side showing a state in which the blade drive actuator is attached to the shutter base plate.

  First, the shutter blades 7, 8, 9, the diaphragm blade 5, and the auxiliary diaphragm blade 6 are assembled into the shutter base plate 1 in a state where they are axially attached to the blade shafts on the shutter base plate 1. That is, the hole 9 a of the shutter blade 9 is pivotally attached to the blade shaft 1 l of the shutter base plate 1. Further, the hole 8a of the shutter blade 8 is pivotally attached to the blade shaft 1k of the shutter base plate 1 from above. Further, the hole 7a of the shutter blade 7 is pivotally attached to the blade shaft 1j of the shutter base plate 1 from above.

  Further, the hole 6b of the aperture auxiliary blade 6 is pivotally attached to the blade shaft 1j of the shutter base plate 1 from above. Further, the hole 5b of the diaphragm blade 5 is pivotally attached to the blade shaft 1i of the shutter base plate 1 from above. From this state, the positions of the hook portions 1b, 1c, 1d of the shutter base plate 1, the stopper 2e of the cover plate 2, and the mounting claws 2f, 2b, 2c are aligned, and the shutter base plate 1 and the cover plate 2 are engaged and coupled. .

  Next, from that state, the blade drive pins connected to the magnet rollers 4b of the blade drive actuator 4 through the long holes 1m of the shutter base plate 1 to the long holes 7b, 8b, 9b of the shutter blades 7, 8, 9 The part 4a is penetrated. Then, the magnet roller 4 b is fitted to the magnet roller rotating shaft 1 n on the shutter base plate 1.

  Here, the configuration of the blade drive actuator 4 for operating the shutter blades 7, 8, and 9 will be described. As shown in FIG. 8, the blade drive actuator 4 is a moving magnet type motor, and this stator has a substantially U-shaped yoke 12 having two end portions as magnetic pole portions, and a coil on the outside of the cylindrical portion. It consists of a bobbin 11 wound with 10. The bobbin 11 has coil winding terminal portions 11a and 11b at both ends, and an overhanging portion 11c provided for fixing the bobbin 11 to a housing portion 1o for housing the bobbin 11 formed on the shutter base plate 1. 11d. The yoke 12 is accommodated between yoke positioning pins 1p and 1q formed on the shutter base plate 1.

  On the other hand, as shown in FIG. 7, the long holes 5c and 6c of the diaphragm blade 5 and the diaphragm auxiliary blade 6 are connected to the magnet roller 3b of the blade drive actuator 3 through the long holes (not shown) of the cover plate 2. The blade drive pin part 3a is penetrated. Then, the magnet roller 3 b is fitted to the magnet roller rotating shaft 2 g on the cover plate 2. The configuration of the blade drive actuator 3 is the same as that of the blade drive actuator 4. The yoke 12 is accommodated between yoke positioning pins 2h and 2i formed on the cover plate 2.

  As described above, at least a part of the blade driving actuator 4 (shutter blade driving unit) for driving the shutter blades and the blade driving actuator 3 (diaphragm blade driving unit) for driving the diaphragm blades in the direction orthogonal to the optical axis. By arranging at positions where the two overlap each other, the projected area in the optical axis direction (outer diameter direction of the main plate) can be reduced.

  Next, a clip for fixing the entire blade driving device according to the first embodiment will be described. FIG. 9 is a diagram for explaining a function of a clip for fixing the blade driving device according to the first embodiment. FIG. 4A is a perspective view of the blade driving device viewed from the subject side, and FIG. 4B is a perspective view of the blade driving device viewed from the image side. FIG. 10 is a front view seen from the subject side showing a state in which the blade driving device is fixed with a clip. FIG. 11 is a front view seen from the image side showing a state in which the blade driving device is fixed by a clip.

  The clip 14 is a nonmagnetic metal material having elasticity (spring property), and is sandwiched between the blade chambers formed by combining the shutter base plate 1 and the cover plate 2 with the blade drive actuators 3 and 4 attached thereto. It is formed in a U-shape that can be embedded. The clip 14 is formed with fitting holes 14a, 14b, 14c, 14d, 14e, and 14f for fixing the blade chamber.

  Then, as shown in FIG. 10, the magnet roller rotating shaft 2g and the yoke positioning pins 2h, 2i of the cover plate 2 are fitted into fitting holes 14a, 14b, 14c formed in the clip 14, respectively. Further, as shown in FIG. 11, the magnet roller rotating shaft 1n and the yoke positioning pins 1p, 1q of the shutter base plate 1 are fitted into fitting holes 14d, 14e, 14f formed in the clip 14, respectively. At this time, the clip 14 is fixed to the shutter base plate 1 and the cover plate 2 with the protruding portions 11c and 11d of the bobbin interposed therebetween. In this state, the coil winding terminal portions 11 a and 11 b of the bobbin 11 protrude from both surfaces of the clip 14.

  Next, attachment of the shutter drive flexible board to the blade drive device according to the first embodiment will be described. FIG. 12 is a diagram for explaining attachment of the shutter-driven flexible board to the blade driving device according to the first embodiment. FIG. 4A is a perspective view of the blade driving device viewed from the subject side, and FIG. 4B is a perspective view of the blade driving device viewed from the image side. FIG. 13 is a front view seen from the subject side showing a state in which the shutter driving flexible board is mounted on the blade driving device. FIG. 14 is a front view seen from the image side showing a state in which the shutter drive flexible substrate is mounted on the blade drive device.

  As shown in FIGS. 12 to 14, the shutter drive flexible board 15 is mounted on the shutter drive flexible board 15 on the coil winding terminal protrusions 11 a and 11 b of the bobbin 11 protruding from both surfaces of the clip 14. The coil winding terminal portions 11a and 11b are soldered in a state where the circuit terminal holes 15a, 15b, 15c and 15d are fitted.

  As described above, in the blade driving device according to the first embodiment, the shutter base plate 1 and the cover plate 2 can be coupled by fitting each hook portion and each mounting claw. Thus, since the blade chamber can be assembled without using screws, rivets, etc., the operation is easy and the number of necessary parts can be reduced. Also, the blade chamber can be easily disassembled. Further, the blade drive actuator 4 is attached to the shutter base plate 1 and the blade drive actuator 3 is attached to the cover plate 2 by the clip 14 formed of a nonmagnetic metal member having elasticity, and the protruding portions 11c and 11d of the bobbin 11 are mounted. This is done by sandwiching

  As described above, since the blade drive actuator can be attached to the blade chamber only by the clip 14 without being melted or bonded, the attachment work can be simplified. The electromagnetic actuator can be easily removed. Further, since the blade chamber is fixed by the elastic clip 14, there is a strong durability against an impact caused by dropping or the like. Furthermore, the shutter drive flexible board 15 is attached to the apparatus by simply soldering the coil winding terminal protruding through the metal clip 14 and the coil terminal fitting hole of the shutter drive flexible board 15 together. It is easy to work.

  Next, the operation of the blade driving device according to the first embodiment will be described with reference to FIGS. 2 and 15 to 17. 15 to 17 are diagrams for explaining the operation of the blade driving device according to the first embodiment. 2 is an initial state, FIG. 15 is a state where the diaphragm blades 5 are inserted from the state of FIG. 2, FIG. 16 is a state where the shutter blades are inserted from the state of FIG. 15, and FIG. It is a figure which shows the state which closed the blade | wing.

  As shown in FIG. 2, when photographing is not being performed (initial state), the aperture assist blade 6 is inserted into the subject optical path, and the shutter blades 7, 8, and 9 have their openings 6a fully opened. At this time, the blade drive actuators 3 and 4 are in a non-energized state. However, a rotational force in the clockwise direction is applied to the magnet roller 3b by a known actuator configuration, and the diaphragm blades 5 and the diaphragm auxiliary blades. 6 is brought into contact with the stoppers 1h and 1g. Thereby, the opening 5a of the diaphragm blade 5 is retracted from the optical path. Further, by applying a clockwise rotational force to the magnet roller 4b, the shutter blades 7, 8, 9 are brought into contact with the stoppers 1g, 1h, 1h, respectively.

  Next, when shifting to the shooting state (shooting with the subject light amount reduced), the diaphragm roller 5 is rotated clockwise by rotating the magnet roller 3b of the blade drive actuator 3 counterclockwise, and the stopper 2e and stop. At the same time, the aperture assist blade 6 is also rotated counterclockwise, slides against the shutter blade 7 and stops in contact with the stopper 1f. This state is shown in FIG. 15. At this time, the subject optical path is restricted by the opening 5a having a small aperture diameter. Further, when the aperture auxiliary blade 6 rotates counterclockwise, the opening 6a formed in the aperture auxiliary blade 6 also moves counterclockwise. In this way, when the aperture 5a of the aperture blade 5 is made to enter the aperture 6a of the aperture assist blade 6, the aperture assist blade 6 is opened by the aperture blade 5 and the aperture 1a of the shutter base plate 1 (and the cover plate). The gap 20 formed between the two openings 2a) is covered to prevent poor exposure.

  In other words, when the diaphragm blade 5 is inserted into the exposure opening and photographing is performed, the diaphragm auxiliary blade 6 is slightly rotated so as to cover a region other than the aperture opening but not blocked by the exposure opening. Yes. In this state, even if the blade drive actuator 3 is de-energized, the magnet roller 3b is continuously applied with the rotational force in the counterclockwise direction by the well-known actuator configuration, and the diaphragm blade 5 and the diaphragm auxiliary blade 6 Holds the state in contact with the stoppers 2e and 1f.

  In this way, when the small aperture state is obtained, a shooting start signal is then given. When a predetermined shooting time has elapsed, the blade drive actuator 4 is energized and the magnet roller 4b rotates counterclockwise. It is done. As a result, the shutter blade 7 and the shutter blades 8 and 9 rotate in opposite directions. At this time, the shutter blade 7 slides with respect to the aperture assist blade 6. And after closing the opening part 5a, it abuts on the stoppers 2e and 1g and stops. Therefore, since the shutter blade 7 always maintains a suitable sliding relationship with the auxiliary aperture blade 6 in the same manner as the shutter blade 8 from the start to the stop of the operation, as shown in FIG. Even without providing a partition plate 13, there is no interference with the diaphragm blade 5 in operation. FIG. 16 shows this state (shutter closed state).

  Thereafter, the blade drive actuators 3 and 4 are energized in the opposite direction to the shutter return operation from the shutter closed state. Therefore, the shutter blades 7, 8, 9 and the diaphragm blade 5 and the diaphragm auxiliary blade 6 are all rotated in the opposite direction, but the shutter blade 7 and the diaphragm auxiliary blade 6 do not interfere at this time. Absent. When the shutter blade 7 comes into contact with the stopper 1g, the shutter blades 8 and 9 come into contact with the stopper 1h, the diaphragm blade 5 comes into contact with the stopper 1h, and the auxiliary diaphragm blade 6 comes into contact with the stopper 1g and stops, The drive actuators 3 and 4 are de-energized to return to the initial state shown in FIG.

  By the way, when the subject light is bright and shooting is performed without using the opening 5a (small aperture diameter) as described above, the shooting is performed using the opening 6a of the aperture auxiliary blade 6. Therefore, in this case, in the initial state of FIG. 2, shooting is started without energizing the blade drive actuator 3. When a predetermined shooting time has elapsed, the blade drive actuator 4 is energized, and the magnet roller 4b is rotated counterclockwise. Therefore, as in the case described with reference to FIG. 16, the shutter blade 7 and the shutter blades 8 and 9 are rotated in opposite directions and stopped in the state shown in FIG. When shooting is completed in this closed state, the blade drive actuator 4 is reversed and returns to the state of FIG.

  As described above, according to the first embodiment, the auxiliary diaphragm blade 6 has a function as a partition plate that partitions the storage area of the diaphragm blade 5 and the shutter blades 7, 8, 9 disposed in the blade chamber. Since it is configured to operate so as to cover the gap between the aperture blade 5 formed when the aperture blade 5 enters the exposed aperture diameter and the edge of the aperture 1a or the aperture 2a, The projected area (outer diameter of the ground plane) can be reduced and the optical axis direction can be reduced.

  Further, since the partition plate 13 is not provided, it is possible to bring the front lens end La on the subject side closer to the aperture blade 5 without reducing the thickness of the shutter base plate 1 and the cover plate 2, and the rear group on the image plane side. It becomes possible to bring the lens end Lb close to the shutter blade 9, and the reduction in thickness in the optical axis direction is promoted (see FIG. 4). In addition, by disposing the shutter blade driving unit and the diaphragm blade driving unit at a position where at least a part thereof overlaps in the direction orthogonal to the optical axis, the projected area in the optical axis direction (the outer diameter direction of the main plate) can be reduced. Can do. Furthermore, since an elastic clip is used to fix the blade chamber, the number of parts for assembly can be reduced, assembly and disassembly are easy, and durability against strong impacts such as dropping can be provided. .

  In the first embodiment, the partition plate 13 as shown in FIG. 27 is not disposed, but the present invention does not prevent the partition plate 13 from being disposed. That is, even if the partition plate 13 is provided, the partition plate 13 may be very thin and small because it is not necessary to provide an opening in the partition plate 13. As a result, the dimension between the subject side surface of the cover plate 2 and the image surface side surface of the shutter base plate 1 can be reduced, and the thinning in the optical axis direction can be promoted.

(Embodiment 2)
In the first embodiment, an example of a blade driving device having a configuration in which a partition plate is not disposed in order to promote thinning in the optical axis direction has been described. However, if the partition plate is simply removed, the shutter blades and the diaphragm auxiliary blades corresponding to the partition plate are in surface contact with each other, and the load of the diaphragm blades and the diaphragm auxiliary blades may be directly applied to the shutter blades depending on the posture of the camera. . For this reason, variations in the travel speed of the shutter blades are likely to occur due to the difference in the posture of the camera, and there is a risk of uneven exposure. Therefore, in the second embodiment, each blade is treated so as not to disturb the operation of other blades. By doing in this way, the exposure nonuniformity by a camera attitude difference can be prevented. Hereinafter, the blade driving device according to the second embodiment will be described in detail.

  FIG. 18 is a diagram illustrating an inner surface (subject side surface) of a shutter base plate constituting a blade chamber of the blade driving device according to the second embodiment. FIG. 19 is a perspective view of the configuration of the blade chamber of the blade driving device according to the second embodiment, viewed from the subject side. The shutter base plate 1 has a sliding surface B on the tip image side surface 6d of the aperture auxiliary blade 6 and a sliding surface C on the image side surface 5d around the hole 5b of the aperture blade 5, which are different in height from the blade chamber base surface A. , A sliding surface D of the front image side surface 8c of the shutter blade 8, a sliding surface E of the image surface side surface 9c of the shutter blade 9, and a sliding surface F of the image side surface 6e around the long hole 6c of the auxiliary aperture blade 6 are provided. ing.

  The sliding surface E is slightly higher than the blade chamber base surface A, and is formed around the opening 1a of the shutter base plate 1 and in a direction extending upward from the periphery to the right side. The sliding surface D is slightly higher than the sliding surface E, and is gently formed from the lower side of the sliding surface E to the upper right side. The tip image side surface 8c of the shutter blade 8 slides on the sliding surface D so that the operation of the shutter blade 9 is not hindered. The sliding surface B is slightly higher than the sliding surface D and is formed below the sliding surface D.

  The sliding surface F has the same height as the sliding surface B and is formed between the blade shaft 1i and the long hole 1e. As the aperture stop blade 6 slides with respect to the sliding surface B and the sliding surface F, the operation of the shutter blade 7 is not hindered. The sliding surface C is slightly higher than the sliding surface F and is formed on the left side of the blade shaft 1i. By sliding the image side surface 5d around the hole 5b of the diaphragm blade 5 with respect to the sliding surface C, the diaphragm blade 5 does not interfere with the operation of the diaphragm auxiliary blade 6.

  FIG. 20 is a diagram illustrating an inner surface (image side surface) of a cover plate that configures the blade chamber of the blade driving device according to the second embodiment. FIG. 21 is a perspective view of the configuration of the blade chamber of the blade driving device according to the second embodiment, viewed from the image side. The cover plate 2 has a sliding surface H on the tip subject side surface 6f of the aperture auxiliary blade 6 and a sliding surface on the subject side surface 7c around the long hole 7b of the shutter blade 7 which are different in height from the blade chamber base surface G. I, sliding surface J of the subject side surface 8d around the hole 8a of the shutter blade 8, sliding surface K of the subject side surface 9d around the hole 9a of the shutter blade 9, sliding surface L of the tip subject side surface 7d of the shutter blade 7; A sliding surface P of the subject side surface 7e of the shutter blade 7 is provided.

  The sliding surface H is slightly higher than the blade chamber base surface G, and the sliding subject H is positioned so as not to interfere with the operation of the diaphragm blade 5 when the tip subject side surface 6f of the auxiliary diaphragm blade 6 slides relative to the sliding surface H. Is formed. The sliding surface I is slightly higher than the sliding surface H, and the subject side surface 7c around the long hole 7b of the shutter blade 7 slides with respect to the sliding surface I. It is formed at a position that does not hinder operation. The sliding surface L is also formed at the same height as the sliding surface I. When the tip subject side surface 7d of the shutter blade 7 slides with respect to the sliding surface L, the auxiliary aperture blade 6 and the shutter blade 8 are moved. It does not interfere with the operation of the.

  Furthermore, the sliding surface P is also formed at the same height as the sliding surface I and the sliding surface L. In particular, the sliding surface P is formed so as to penetrate the elongated hole 6g of the auxiliary diaphragm blade 6. The subject side surface 7e of the shutter blade 7 slides with respect to the sliding surface P so that the operations of the aperture auxiliary blade 6 and the shutter blade 8 are not hindered. The sliding surface J is slightly higher than the sliding surface I, and when the subject side surface 8d around the hole 8a of the shutter blade 8 slides with respect to the sliding surface J, the operation of the shutter blade 7 and the shutter blade 9 is performed. It is formed in a position that does not interfere. The sliding surface K is slightly higher than the sliding surface J, and the subject side surface 9d around the hole 9a of the shutter blade 9 slides with respect to the sliding surface K so that the operation of the shutter blade 8 is not hindered. Formed in position.

  In the blade driving device according to the second embodiment, the configuration other than the above is the same as that of the blade driving device of the first embodiment. Hereinafter, the operation of the blade driving device according to the second embodiment will be described with reference to FIGS. 22 to 25.

  22 to 25 are diagrams for explaining the operation of the blade driving device according to the second embodiment. 22 is an initial state, FIG. 23 is a state where the diaphragm blades 5 are inserted from the state of FIG. 22, FIG. 24 is a state where the shutter blades are inserted from the state of FIG. 23, and FIG. It is a figure which shows the state which closed the blade | wing.

  As shown in FIG. 22, when photographing is not being performed (initial state), the aperture assist blade 6 is inserted into the subject optical path, and the shutter blades 7, 8, and 9 have their openings 6a fully opened. At this time, the blade drive actuators 3 and 4 are in a non-energized state. However, a rotational force in the clockwise direction is applied to the magnet roller 3b by a known actuator configuration, and the diaphragm blades 5 and the diaphragm auxiliary blades. 6 is brought into contact with the stoppers 1h and 1g. Thereby, the opening 5a of the diaphragm blade 5 is retracted from the optical path. Further, by applying a clockwise rotational force to the magnet roller 4b, the shutter blades 7, 8, 9 are brought into contact with the stoppers 1g, 1h, 1h, respectively.

  Next, when shifting to the shooting state (shooting with the subject light amount reduced), the diaphragm roller 5 is rotated clockwise by rotating the magnet roller 3b of the blade drive actuator 3 counterclockwise, and the stopper 2e and stop. At the same time, the aperture assist blade 6 is also rotated counterclockwise, slides against the shutter blade 7 and stops in contact with the stopper 1f. This state is shown in FIG. 23. At this time, the subject optical path is restricted by the small-diameter opening 5a. Further, when the aperture auxiliary blade 6 rotates counterclockwise, the opening 6a formed in the aperture auxiliary blade 6 also moves counterclockwise.

  In this way, when the aperture 5a of the aperture blade 5 is made to enter the aperture 6a of the aperture assist blade 6, the aperture blade 5 and the aperture 1a of the shutter base plate 1 (and the cover plate) by the aperture assist blade 6. The gap 20 formed between the two openings 2a) is covered to prevent poor exposure. In other words, when the diaphragm blade 5 is inserted into the exposure opening and photographing is performed, the diaphragm auxiliary blade 6 is slightly rotated so as to cover a region other than the aperture opening but not blocked by the exposure opening. Yes. In this state, even if the blade drive actuator 3 is de-energized, the magnet roller 3b is continuously applied with the rotational force in the counterclockwise direction by the well-known actuator configuration, and the diaphragm blade 5 and the diaphragm auxiliary blade 6 Holds the state in contact with the stoppers 2e and 1f.

  At this time, the subject side surface of the diaphragm blade 5 slides with respect to the blade chamber base surface G of the cover plate 2, and the image side surface slides with respect to the diaphragm auxiliary blade 6. The diaphragm blade 5 is restricted in the thrust position range toward the image side by sliding the image side surface 5d around the hole 5b with respect to the sliding surface C in the vicinity of the blade shaft 1i. Further, in the aperture auxiliary blade 6, the tip subject side surface 6f slides with respect to the sliding surface H, the tip image side surface 6d slides with respect to the sliding surface B, and the image side surface 6e around the slot 6c slides. By sliding with respect to the moving surface F, the thrust position range in the optical axis direction is regulated.

  In this way, when the small aperture state is obtained, a shooting start signal is then given. When a predetermined shooting time has elapsed, the blade drive actuator 4 is energized and the magnet roller 4b rotates counterclockwise. It is done. As a result, the shutter blade 7 and the shutter blades 8 and 9 rotate in opposite directions, close the opening 5a, and then come into contact with the stoppers 2e and 1g and stop. FIG. 24 shows this state (shutter closed state).

  At this time, the shutter blade 7 slides relative to the aperture auxiliary blade 6. At the same time, the subject side surface 7e slides with respect to the sliding surface P formed so as to pass through the long hole 6g of the auxiliary aperture blade 6, and the tip subject side surface 7d slides with respect to the sliding surface L, When the subject side surface 7c around 7b slides along the sliding surface I, the thrust position range of the shutter blade 7 toward the subject side is regulated. Therefore, since the shutter blade 7 always maintains a suitable sliding relationship with the auxiliary aperture blade 6 in the same manner as the shutter blade 8 from the start to the stop of the operation, as shown in FIG. Even without providing a partition plate 13, there is no interference with the auxiliary diaphragm blade 6 in operation.

  Further, the shutter blade 8 slides on the subject side surface with respect to the shutter blade 7, but when the peripheral portion 8d of the hole 8a around the blade shaft 1k slides with respect to the sliding surface J, The thrust position range toward the subject is restricted. Further, the shutter blade 8 slides on its image surface side with respect to the shutter blade 9, but the tip image side surface 8 c also slides on the sliding surface D formed on the shutter base plate 1. By doing so, the thrust position range of the front image side surface 8c is regulated.

  The shutter blade 9 has an image side surface 9c that slides on a sliding surface E formed on the shutter base plate 1. However, since the contact area between the image side surface 9c and the sliding surface E is small, the shutter blade 9 There is no problem with low sliding resistance during operation. The subject side surface of the shutter blade 9 slides with respect to the shutter blade 8, but the subject side surface 9 d around the hole 9 a located in the peripheral portion of the blade shaft 1 i is formed on the cover plate 2. By sliding with respect to K, the thrust position range of the shutter blade 9 toward the subject is regulated.

  Thereafter, the blade drive actuators 3 and 4 are energized in the opposite direction to the shutter return operation from the shutter closed state. Therefore, the shutter blades 7, 8, 9 and the diaphragm blade 5 and the diaphragm auxiliary blade 6 are all rotated in the opposite direction, but the shutter blade 7 and the diaphragm auxiliary blade 6 do not interfere at this time. Absent. When the shutter blade 7 comes into contact with the stopper 1g, the shutter blades 8 and 9 come into contact with the stopper 1h, the diaphragm blade 5 comes into contact with the stopper 1h, and the auxiliary diaphragm blade 6 comes into contact with the stopper 1g and stops, The drive actuators 3 and 4 are de-energized to return to the initial state shown in FIG.

  By the way, when the subject light is bright and shooting is performed without using the opening 5a (small aperture diameter) as described above, the shooting is performed using the opening 6a of the aperture auxiliary blade 6. Therefore, in this case, in the initial state of FIG. 22, shooting is started without energizing the blade drive actuator 3. When a predetermined shooting time has elapsed, the blade drive actuator 4 is energized, and the magnet roller 4b is rotated counterclockwise. Therefore, as in the case described with reference to FIG. 24, the shutter blade 7 and the shutter blades 8 and 9 are rotated in opposite directions and stopped in the state shown in FIG. When shooting is completed in this closed state, the blade drive actuator 4 is reversed and returns to the state of FIG. The operation of each of the series of blades at this time is performed in a suitable state as described above.

  As described above, in the blade driving apparatus according to the second embodiment, a plurality of sliding surfaces dedicated to each blade protruding from the base surface of the blade chamber are formed inside the blade chamber, and these sliding surfaces are contacted. The blades slide while in contact with each other, thereby preventing excessive contact between the blades. For this reason, even if each blade is stacked due to the difference in posture of the camera, the weight of the specific blade is not directly added to the other blade, and the operation of the other blade is not hindered. Therefore, it is possible to eliminate variations in the operation time of the shutter blades due to a difference in camera posture, and it is possible to prevent uneven exposure. In addition, in a high humidity environment, it is possible to prevent problems such as excessive close contact between blades due to condensation, stoppage of operation, and variation in operation time.

  As described above, the blade driving device according to the present invention is useful for a digital camera, and is particularly suitable for a digital camera built in a small portable device.

DESCRIPTION OF SYMBOLS 1 Shutter base plate 2 Cover plate 3, 4 Blade drive actuator 5 Diaphragm blade 6 Diaphragm auxiliary blade 7, 8, 9 Shutter blade 10 Coil 11 Bobbin 12 Yoke 13 Partition plate 14 Clip

Claims (4)

Two ground plates that constitute the blade chamber between the two openings so that the respective openings overlap,
A diaphragm blade having a diaphragm opening that is operatively disposed in the blade chamber and regulates a small diaphragm aperture;
A shutter blade disposed in the blade chamber;
An auxiliary member that is disposed between the diaphragm blades and the shutter blades in the blade chamber and has an exposure opening that is disposed at a position that is larger than the diaphragm opening and overlaps the opening;
Diaphragm blade driving means for driving the diaphragm blade so as to advance and retract the diaphragm opening with respect to the exposure opening;
Shutter blade driving means for driving the shutter blade so that the shutter blade opens and closes the exposure opening;
With
The auxiliary member is provided so as to be operable according to driving of the diaphragm blades by the diaphragm blade driving means,
The aperture blade driving means covers the gap formed between the aperture blade and the edge of the opening by the auxiliary member when the aperture opening of the aperture blade enters the exposure aperture. A blade drive device characterized by operating an auxiliary member. The diaphragm blade driving means is attached to one of the ground plates outside the blade chamber, and the shutter blade driving means is attached to the other of the ground plates outside the blade chamber,
2. The blade driving device according to claim 1, wherein the diaphragm blade driving unit and the shutter blade driving unit are arranged at a position where at least a part thereof overlaps in a direction orthogonal to the optical axis.   The blade chamber is fixed by a U-shaped clip formed of a nonmagnetic metal material having elasticity together with the diaphragm blade driving means and the shutter blade driving means attached to the outside. The blade driving device according to claim 2. On the inner side of the blade chamber, a sliding surface protruding with respect to the base surface of the main plate is formed,
The thrust direction of the member is restricted by sliding while the diaphragm blade, the auxiliary member, and a part of the surface of the shutter blade are in contact with the sliding surface. The blade drive device according to any one of the above.

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