JP6426436B2 - Blade driving device, light amount adjusting device, and imaging device - Google Patents

Description

  The present invention relates to, for example, a blade drive device such as a diaphragm device, a light amount adjustment device using the blade drive device, and an imaging device such as a camera equipped with the light amount adjustment device.

  In the iris diaphragm device used for an imaging device etc., the diaphragm aperture which makes light pass is formed of several blade | wings. Patent Document 1 discloses a configuration in which a large number of light shielding blades are pivoted by using a pivotable drive ring around a fixed opening formed in a fixed plate to form a diaphragm opening.

JP 2003-5248 A

  In recent years, in a blade driving device such as a diaphragm device, a demand for driving stability of a blade directed to a path through which light passes has increased.

  The present invention provides a blade drive device, a light amount adjustment device, and an imaging device that can realize stable driving of the blade.

The present invention comprises: an opening forming member having an opening through which light passes; and a transverse blade which is disposed outside the opening of the opening forming member and which rotates in a state of crossing the opening . said transverse blade has a leading edge portion of the one end portion serving as a free end, of the end portion, and the rear end portion wherein the leading edge portion which partially protrudes on the opposite side of the blade advancing direction, the rear A narrow constriction portion provided between the end portion and the proximal end portion to which the driving force is transmitted, the plurality of crossing vanes disposed outside the opening of the opening forming member in the process of squeezing the light transmission path in the opening, said transverse wings, while leaving the state where said cutting edge portion and the rear end portion is superposed in the optical axis direction with respect to the peripheral edge of the opening, said opening the upper part rotates, connecting the rear end portion from said most distal end portion of said transverse blade edge A portion not covering the opening between the edge of the opening and a portion not covering the opening between the narrow portion and the edge of the opening A blade driving device characterized in that it is covered by a crossing blade . According to an aspect of such invention, since the end portion after the crossing blades has left a state superimposed on the peripheral edge of the opening, it is possible to realize a stable driving of the transverse blades. Further, high speed driving of the blades can be coped with by making use of the portion covering the opening by the other cross blade and minimizing the area covering the opening by one cross blade .

Further, in the present invention, prior SL has a through hole where the light communicated with the opening portion of the opening forming member passes, a drive ring which rotates around the said opening,
The drive ring may be engaged with a plurality of the transverse vanes disposed around the opening to rotate the transverse vanes . According to such an aspect of the present invention, it is possible to rotate the plurality of crossing blades substantially simultaneously by the drive ring disposed around the opening.

Further, in the present invention, the drive ring is disposed on the aperture forming member, and the cross blade further includes another aperture forming member disposed with the drive ring between the drive ring and the aperture forming member. And, disposed between the drive ring and the other opening forming member, and overlap the opening peripheral edge of the other opening forming member and the peripheral edge of the through hole of the drive ring in the optical axis direction. The overlapping area of the cross blade with the other opening forming member may be relatively larger than the overlapping area of the cross blade with the drive ring. According to such an aspect of the present invention, since the rear end of the cross blade overlaps with both the other opening forming member and the drive ring, the driving stability of the blade can be enhanced.

  Further, in the present invention, the outer shape of the drive ring is provided substantially smaller than the opening forming member, and the opening forming member includes a drive ring accommodating portion for rotatably accommodating the drive ring, and In the outer side of the drive ring accommodating portion of the opening forming member, there is provided a blade accommodating portion for accommodating the rear end portion of the transverse blade in a state where the crossing blade is retracted from the opening. According to this aspect of the present invention, since the outer shape difference between the drive ring and the opening forming member is made to provide the blade housing portion in the opening forming member, crossing of the entire outer shape of the blade driving device is prevented. The rear end portion of the blade can be partially protruded to realize stable driving of the blade.

Further, in the present invention, the outer shape of the drive ring is provided substantially smaller than the opening forming member, and the blade in which the crossing blade travels between the other opening forming member and the drive ring. A traveling space is formed, and a part of the blade traveling space is provided by cutting out a part of an outer peripheral portion corresponding to the outside of the drive ring in the opening forming member, and the rear end of the crossing vanes And a blade receiving portion for receiving the portion. According to the aspect of the present invention, since the blade traveling space of the crossing blade can be secured by the blade housing portion provided by cutting the opening forming member, the drive ring, and the opening forming member, the entire outer shape of the blade driving device The rear end portion of the cross blade can be partially protruded to realize stable driving of the blade while preventing upsizing of the blade.

  Further, in the present invention, a plurality of the crossing blades are provided, and at least one of the blade receiving portions is provided so as to receive the respective rear ends of the plurality of crossing blades in common. Do. According to the aspect of the present invention, space saving of the blade driving device can be achieved by sharing the blade housing portion with a plurality of crossing blades.

  The present invention is also broadly applicable to a light amount adjusting device characterized in that the blade driving device is used for light amount adjustment, or an imaging device characterized in that the light amount adjusting device is provided. According to this aspect of the present invention, it is possible to realize a light amount adjustment device or an imaging device capable of performing stable driving of the blades and performing appropriate light amount adjustment.

According to the present invention, it is possible to realize a blade drive device and the light quantity regulatory apparatus and imaging apparatus capable of realizing a stable driving of the blade.

FIG. 1 is an exploded perspective view of a diaphragm device according to a first embodiment of the present invention. FIG. 2 is a front view showing the diaphragm blade in the first embodiment. The front view which shows the fully closed and fully open state in 1st Embodiment. The disassembled perspective view of the aperture | diaphragm apparatus which concerns on the 2nd Embodiment of this invention. The front view which shows the aperture blade in 2nd Embodiment. The disassembled perspective view of the aperture | diaphragm apparatus which concerns on the 3rd Embodiment of this invention. The front view which shows the aperture blade in 3rd Embodiment. FIG. 2 is a cross-sectional view of an imaging device equipped with the diaphragm device of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

First Embodiment
FIG. 1 is an exploded view of an iris diaphragm device as an application example of a blade driving device (light amount adjusting device) according to a first embodiment of the present invention.

  The diaphragm device of the present embodiment is a blade drive device which drives blades to block an optical path through which light passes, and more specifically, forms a light passing path by a light passing aperture forming member having an opening through which light passes. The apparatus for adjusting the light quantity is provided by the plurality of crossing blades moving into the light passage path (opening).

  For example, as shown in FIG. 1, the diaphragm device of the present embodiment is a base member (fixed opening forming member) 1 which is a disk-shaped opening forming member in which a fixed opening (opening) 1a through which light passes is formed. And the cover member 7 which is a disk-like opening forming member in which the fixed opening 7a is formed. That is, the base member 1 and the cover member 7 become one of the light passage opening forming members. Further, the base member 1 is an annular projection (annular projection) in which a plurality of shaft portions 1d serving as rotation centers of a plurality of diaphragm blades 5 described later and a through hole 3d of the drive ring 3 described later are inserted and engaged. ) 1b and a guide 1e for guiding the rotation of the drive ring 3 described later on the side surface of the projection 1d. The traveling direction (light passing direction) of the light passing through the fixed aperture 1 a and the diaphragm aperture formed by the plurality of diaphragm blades 5 is hereinafter referred to as the optical axis direction.

  The blade drive unit 6 for driving the plurality of diaphragm blades 5 is constituted by an actuator such as a stepping motor, for example, and attached to the base member 1. The blade drive arm 2 is attached to the output shaft of the blade drive unit 6. The blade drive arm 2 is provided with a ring drive pin 2b. Such a blade drive unit 6 serves as means for applying rotational power to each diaphragm blade 5 via a drive ring 3 described later by rotating the blade drive arm 2 around the output shaft.

  In the drive ring 3 serving as an annular drive member engaged with each aperture blade 5, the long hole 3b engaged with the ring drive pin 2b and a plurality of (six in the present embodiment) aperture blades 5 are rotated. A plurality of blade drive pins 3c are provided. Each of the plurality of blade drive pins 3 c is engaged with the cam hole 5 c formed in the base end 5 a of the diaphragm blade 5. The cam hole portion 5c of each of the diaphragm blades 5 is provided in a region facing the drive ring 3 so as not to enter the fixed opening 1a.

  The base end 5a of the diaphragm blade 5 is further formed with a hole 5d into which the shaft 1d of the base member 1 is inserted. The drive ring 3 is an annular member surrounding the light passage and having a through hole 3 d and an outer diameter portion 3 e smaller than the outer peripheral portion 1 h of the base member 1. The through hole 3 d of the drive ring 3 is formed larger than the fixed opening 1 a of the base member 1. Further, the through hole 3 d of the drive ring 3 is formed larger than the fixed opening 7 a of the cover member 7.

  That is, since the drive ring 3 rotates around the opening through which the light passes, and the through hole 3 d communicates with the fixed opening 1 a of the base member 1, it becomes one of the members through which the light passes. For example, in the present embodiment, since the drive ring 3 is incorporated into the housing portion of the base member 1 (inside the protrusion 1b of the base member 1), the base member 1 is not an opening forming member. In the present embodiment, the outer shape of the drive ring 3 is smaller than the outer shapes of the base member 1 and the cover member 7. Further, although the shaft portion 1d of the base member 1 is located outside the outer diameter portion 3e of the drive ring 3, the shaft portion 1d of the base member 1 is between the through hole 3d of the drive ring 3 and the outer diameter 3e. It may be located at

  FIG. 2 is a front view showing the diaphragm blade in the first embodiment. As shown in FIG. 1 and FIG. 2, among the blade groups of the respective diaphragm blades 5, one of the stop blades 5 on the both end sides is formed on the protrusion 1b formed in the periphery of the fixed opening 1a of the cover member 1 in the optical axis direction. Partially overlapping, the other partially overlapping with the peripheral edge of the fixed opening 7 a of the cover member 7. The diaphragm blades 5 are arranged at substantially equal angular intervals in the circumferential direction. Each diaphragm blade 5 interlocks with the rotation of the drive ring 3 to form the diaphragm aperture in the optical axis direction, as described later in detail.

  Each diaphragm blade 5 is disposed between the base member 1 disposed so as to sandwich the drive ring 3 and the cover member 7 disposed at the opposite position, and the fixed opening of the cover member 7 in the optical axis direction. It overlaps with each of the peripheral portion of 7 a and the protrusion 1 b of the base member 1. In the present embodiment, the area where the diaphragm blades 5 overlap with the cover member 7 is relatively larger than the area where the diaphragm blades 5 overlap with the base member 1. As a result, since the rear end portions 1 f of the respective diaphragm blades 5 overlap in the optical axis direction on both the cover member 7 and the base member 1, the driving stability of the blades can be enhanced. In particular, driving stability of the blade can be enhanced by setting a large overlapping area to the cover member 7 provided with the fixed opening 7a. Here, in the superimposed state, not only the relationship between the blade and the other members in physical contact but also the blade substantially in the optical axis direction so as to surround the periphery of the light passing path. Including the state of overlapping and stacking.

  Here, in each diaphragm blade 5, a portion engaged with the drive ring 3 and to which rotational power is transmitted is referred to as a base end 5a, and one end on the opposite side to the base end 5a which is a rotation center side. The (free end side) is referred to as a distal end 5e, and the portion between the proximal end 5a and the distal end 5e is referred to as an intermediate portion 5b. Further, in the diaphragm blade 5, the tip end portion of the distal end portion 5e of the diaphragm blade 5 is referred to as a beak 5g, and a partially protruding portion on the opposite side in the advancing direction of the diaphragm blade 5 is referred to as the beak 5g. It is called the rear end 5f. Further, a blade edge portion in which the beak portion 5g and the rear end portion 5f are linearly connected is referred to as a front end head 5h.

  That is, each diaphragm blade 5 becomes, in order from the side engaging with the drive ring 3 to the free end side, the proximal end 5a, the narrow intermediate portion (neck portion) 5b, and the distal end 5e, One end side of the front end portion 5e is the beak portion 5g in the blade traveling direction, and the other end side is the rear end portion 5f. Then, in the process of narrowing the light passage path, that is, in the process of entering from the beak portion 5g toward the light passage opening, each aperture blade 5 has fixed openings 1a and 7a from the base end 5a to the tip 5e of the blades. And the rear end portion 5f (rear end side) in the rotation direction is also a transverse type rotation blade overlapping the fixed openings 1a and 7a. For example, in the present embodiment, at least the beak portion 5g is in the fixed opening 1a while the beak portion 5g or the vicinity thereof travels on the peripheral edge portion of the fixed opening 1a in the blade traveling process. It remains in the state of remaining on the peripheral edge of the fixed opening 1a without rushing to the bottom, and when the rear end 5f is positioned on the projection 1b of the fixed opening 1a, it becomes the minimum throttling state. The portion 5g and the rear end portion 5f substantially remain on the projection 1b of the fixed opening 1a. That is, in the minimum aperture state using each aperture blade 5, the aperture blade 5 on the drive ring 3 side of the blade group and the rear end 5f of the aperture blade 5 on the cover member 7 side have the fixed openings 1a and 7a. It is in a state of being always superimposed on the upper side, that is, in a state of remaining on the outside of each fixed opening 1a, 7a. In the present embodiment, all the diaphragm blades 5 are the above-described traverse type rotary vanes (transverse vanes), and are configured in the same manner, and therefore the individual description will be omitted.

  Here, FIGS. 3A and 3B show the fully closed state of the diaphragm blade 5 and the fully open state after the rotation is completed, which will be described in addition to FIGS. 1 and 2. The base member 1 is provided with accommodation portions 1f (1f1, 1f2, 1f3, 1f4, 1f5, 1f6) for accommodating the blade rear end portion 5f in a state where the diaphragm blade 5 is fully open. Further, the outer shape in the vicinity of the rotation center hole 5d of the diaphragm blade 5 is also accommodated in the accommodation portion.

  Outside the housing portion 1 f, a non-housing portion 1 g thicker than the housing portion 1 f is provided in the direction in which the diaphragm blades 5 overlap in the optical axis direction. The housing portion 1 f reaches the outer peripheral portion 1 h of the base member 1 and there are housing portions 1 f 1 and 1 f 4 which are notches. Further, a housing portion 1i for housing the drive ring 3 is provided in the base member 1 between the outer diameter portion 3e of the drive ring 3 and the outer peripheral portion 1h of the base member 1, and the base member 1 in the optical axis direction. The drive ring 3 is housed so as not to be convex than the housing portion 1 f of the above. That is, the diaphragm blade 5 on the drive ring 3 side of the blade group is not in surface contact with the drive ring 3 and is supported by the upper surface of the projection 1 b and the accommodation portion 1 f of the base member 1 Sliding contact in the direction.

  Then, by providing the accommodating portion 1 f in each diaphragm blade 5, it is possible to reduce the total thickness of the base member 1 and the diaphragm blade 5 in the optical axis direction, and by providing the non-accommodating portion, the base member 1 or It is possible to increase the rigidity of the light amount adjustment device.

  Here, for example, in the present embodiment, the light passage of the transverse rotation blade in which both the rotation center 5d of the diaphragm blade 5 to the tip end 5e and the rear end 5f of the rotation direction from the rotation center 5d cross The shape of the opening is formed to adjust the light amount. At this time, the light amount adjustment structure is realized by overlapping the diaphragm blades 5 which are a plurality of traverse type rotary blades.

  In the blade group, the front end 5e of the diaphragm blade 5 on the cover member 7 side in the rotational direction of the blade at least partially overlaps the fixed opening 7a of the cover member 7, and the rear end 5f in the rotational direction (rear end side) Is also a transverse type rotary blade overlapping the fixed opening 7a. That is, three points are supported substantially when combined with the base end 5a on the rotation center side.

  Even if the diaphragm blade 5 is rotated from fully closed to fully open, the tip end 5e of the diaphragm blade 5 substantially always overlaps with the peripheral edge of the fixed opening 7a of the cover member 7, that is, located outside the fixed opening 7a. ing. Therefore, since the tip 5e of the diaphragm blade 5 is superimposed on the peripheral edge of the fixed opening 7a, the entire tip 5e on the free end side of the diaphragm blade 5 does not fall into the fixed opening 7a and does not cross. Therefore, the driving stability of the blades can be sufficiently secured even if the weight of overlapping blades is added.

  In the present embodiment, among the blade group consisting of the diaphragm blades 5, the diaphragm blade 5 at one end side in the optical axis direction is directly superimposed on the base member 1 (protrusion 1b), and the other end side in the optical axis direction The diaphragm blade 5 directly overlaps the cover member 7, and the remaining diaphragm blade 5 is indirectly overlapped and held between the blades. That is, in the blade traveling space defined between the drive ring 3 and the cover member 7, the diaphragm blades 5 on the drive ring 3 side or the cover member 7 side are fixed openings 1 a and 7 a of the base member 1 or the cover member 7. Is superimposed on the periphery of the optical axis in the optical axis direction. Further, since the remaining diaphragm blades 5 sandwiched between the diaphragm blades 5 at both ends of the blade group are also substantially overlapped in the optical axis direction, each of the blade groups is overlapped in the optical axis direction with each other. The diaphragm blades 5 are stacked. Further, in a state where the blade group is fully closed, in the fixed opening 7a of the cover member 7 or the projection 1b of the base member 1, a portion overlapping in the optical axis direction is substantially equally distributed over the outer peripheral direction of the opening. It is formed. For this reason, the diaphragm blades 5 mutually enhance the driving stability of the blades in the relative stacking relationship.

  Further, in the process of narrowing the light passage paths in the fixed openings 1a and 7a, each diaphragm blade 5 of the present embodiment has a tip 5h extending from the beak portion 5g to the rear end 5f of each diaphragm blade 5, , 7a, and a portion of each diaphragm blade 5 which does not cover the fixed opening 1a, 7a is covered with a part of another diaphragm blade 5. As described above, in order to stably drive each diaphragm blade 5, a part (rear end 5f) of the diaphragm blade 5 is partially protruded and superimposed on the peripheral edge of the fixed opening 7a to realize stable driving. Further, by utilizing the part covering the fixed openings 1 a and 7 a by the other diaphragm blades 5 and minimizing the area covering the fixed openings 1 a and 7 a by one diaphragm blade 5, each diaphragm blade 5 Thus, the weight of each diaphragm blade 5 can be reduced, and high speed driving of the diaphragm blade 5 can be coped with. The distal end head 5h may be recessed toward the proximal end 5a.

  Further, in the present embodiment, a narrow portion (intermediate portion 5b) having a narrow width in the blade traveling direction is provided between the tip end 5e of each diaphragm blade 5 and the base end 5a to which the driving force is transmitted. ing. In the intermediate portion 5b, a portion which does not cover the fixed openings 1a and 7a in the blade advancing direction is formed, but a configuration in which it is covered by a part of another diaphragm blade 5 is adopted. As a result, it is possible to provide the middle portion 5 b in each diaphragm blade 5 and to set the outer shape of each diaphragm blade 5 small. That is, in order to reliably cover the fixed openings 1a and 7a, the area which covers the fixed openings 1a and 7a by one diaphragm blade 5 is minimized by utilizing the part covering the fixed openings 1a and 7a by the other diaphragm blades 5 Further, high speed driving of the diaphragm blade 5 can be coped with.

  Furthermore, in the present embodiment, when the diaphragm blade 5 retracts from the fixed opening 7a of the cover member 7, the vicinity of the front end is on the outer periphery of the fixed opening 7a and is not fallen. The outer end surface 5i of the distal end head 5h, which has an outer shape between 5f, crosses the end surface of the fixed opening 1a without rubbing and can perform stable rotation.

  In addition, when the diaphragm blade 5 is supported as in the present embodiment, the amount of warping does not change substantially, that is, the opening area also changes at a constant rate, and a stable light amount adjustment device can be obtained. Note that the diaphragm blade 5 does not fall into the fixed opening 7a (or fixed opening 1a) as in the present embodiment, regardless of whether the gravity direction of the light amount adjustment device matches or does not match the optical axis direction. A stable opening area can be obtained without being affected by the direction of gravity from the state to the fully open state.

  Also in the rear end 5f of the rotation direction of the diaphragm blade 5, since the rear end 5f is not inside the fixed opening 7a (or fixed opening 1a) of the cover member 7 in the minimum throttle state, the diaphragm blade 5 A rear end 5f is added to two points of the base end and supported so as to cross the fixed opening 7a, and an intermediate portion 5b located between the tip 5e and the base 5a of the diaphragm blade 5 is the blade itself. It is possible to effectively prevent the weight from falling into the fixed opening 7a. Further, when there are a plurality of diaphragm blades 5, the amount of falling into the fixed opening 7a becomes relatively large, but in the present embodiment, each diaphragm blade 5 is provided with the rear end portion 5f. The three-point support of the beak portion 5g, the base end 5a, and the rear end 5f enables stable rotation without falling into the fixed opening 7a. In particular, according to the present embodiment, since each diaphragm blade 5 is a cross blade and the partial rear end 5f is overlapped, stable rotational movement is possible even if the diameter of the light passage opening is increased. Can be secured.

  In the present embodiment, when the blade drive arm 2 is rotated by the blade drive unit 6 and the drive ring 3 is rotated, the diaphragm drive pin 3c moves in the cam hole 5c while the diaphragm blade 5 is the shaft 1d. Rotate around the As a result, the aperture opening is formed by retracting all the aperture blades 5 out of the area of the fixed aperture 1a, and the minimum aperture opening formed by the largest overlapping amount of all the aperture blades 5 And adjust the amount of light passing through this aperture. In the following description, the state in which the open diaphragm opening is formed is referred to as an open state, and the state in which the smallest diaphragm opening is formed is referred to as a smallest drawn state.

  The cover member 7 has a fixed opening 7 a of the same diameter as the fixed opening 1 a of the base member 1, and the drive ring 3 and the diaphragm blade 5 are interposed between the cover member 7 and the base member 1. The base member 1 is fixed by screws. That is, since the fixed opening 7a is a light passage path, the cover member 7 is one of the light passage opening forming members having an opening through which light passes.

  Furthermore, as shown in FIG. 3, the diaphragm device described in the present embodiment may be provided with a shutter function of fully closing the diaphragm opening, and the minimum diaphragm state in which the diaphragm opening is minimum may be the fully closed state. .

Second Embodiment
FIG. 4 is an exploded perspective view of an iris diaphragm as a second embodiment of the light quantity adjustment device of the present invention. In the first embodiment, the configuration in which all the plurality of sheets are the diaphragm blades 5 has been described. In the present embodiment, the second diaphragm blade 12 is disposed between at least one diaphragm blade 5.

  FIG. 5 shows a front view of the diaphragm blade in the second embodiment. The second diaphragm blade 12 traverses the fixed openings 1a and 7a by the diaphragm blade tip 12e at least in the minimum diaphragm state. The second diaphragm blade 12 has a smaller shape area than the diaphragm blade 5 as in the first embodiment, and is effective for operation.

Third Embodiment
FIG. 6 is an exploded view of an iris diaphragm device as a third embodiment of the light amount adjustment device of the present invention. In the first embodiment, the configuration in which all the plurality of sheets are the diaphragm blades 5 has been described. In the present embodiment, at least one of the third diaphragm blades 16 f is disposed between the diaphragm blades 5.

FIG. 7 shows a front view of the diaphragm blade in the third embodiment. The third diaphragm blade 16 traverses the fixed opening 1a by the diaphragm blade rear end 16f at least in the minimum diaphragm state. The third diaphragm blade 16 has a smaller shape area than the first diaphragm blade 5 and is effective for operation.

Fourth Embodiment
FIG. 8 shows an imaging device as an example of an optical apparatus equipped with the diaphragm device described in the first, second, or third embodiment. The reference numerals 1, 3, 5 and 6 indicate that the members to which the reference numerals are attached are the members to which the same reference numerals are attached in the first embodiment.

  The light from the subject is incident on the photographing optical system 15, passes through the diaphragm aperture of the diaphragm device included in the photographing optical system 15, and forms a subject image on the imaging device 13 configured by a CCD sensor, a CMOS sensor, etc. . The imaging device 13 photoelectrically converts an object image and outputs an imaging signal. The imaging device generates a video signal from the imaging signal, and records or displays the video signal.

  In the first to third embodiments, the warpage of the plurality of first diaphragm blades 5 toward the base member 1 is limited by the second diaphragm blade 4. The lens 14 adjacent to the lens 4 can be disposed close to the diaphragm blades 4 and 5. For this reason, as shown in FIG. 10, it is possible to miniaturize the photographing optical system 15 and the imaging device as compared with the case of using the conventional diaphragm device in which the warp of the diaphragm blade 105 occurs.

  In addition, the diaphragm device described in the first and second embodiments can be mounted not only in the imaging device as described in the present embodiment but also in other optical devices such as an interchangeable lens.

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment when implementing the present invention.

  For example, in each of the above-described embodiments, the configuration has been described in which the light passing aperture is narrowed using a plurality of diaphragm blades, however, the present invention is of course not limited thereto, a configuration in which the light passing aperture is blocked by one blade. The present invention can be applied to a blade holding an optical filter (infrared cut filter, infrared / ultraviolet cut filter, ND filter, etc.) as a blade.

  In each of the above-described embodiments, the expansion device has been described in the structure in which the cover member, the blade group, the drive ring, and the base member (base plate) are sequentially stacked in the optical axis direction. The throttling device may be configured with a structure in which the cover member, the drive ring, the blades, and the base member are stacked in this order. In this case, the blade group is disposed in a blade travel space formed between the drive ring and the base member, and each diaphragm blade crosses the light passage opening communicating the drive ring or the base member, and By maintaining the state in which the rear end portion in the blade advancing direction overlaps the peripheral edge portion of the opening in the optical axis direction, the same effect as that of the above-described embodiment can be obtained.

  In each of the above-described embodiments, a structural example has been described in which the drive ring is dropped into the housing portion of the base member (inside the protrusion of the base member), but the present invention is of course not limited thereto. The hole may be an opening through which light passes, and the drive ring may be an opening forming member. In this case, the direct superposition target of the diaphragm blade on the drive ring side in the optical axis direction is the drive ring, and more specifically, the peripheral portion of the through hole of the drive ring.

  In the embodiment described above, although the base member and the cover member are distinguished and described, the present invention is not limited to this, and a driving ring that pivots is provided between the first substrate and the second substrate, The present invention can also be applied to a configuration in which cross vanes are provided between one substrate and the drive ring, or between the second substrate and the drive ring, or both.

DESCRIPTION OF SYMBOLS 1 base member 2 blade drive arm 3 drive ring 5 aperture blade 6 blade drive part 7 case 12 2nd aperture blade 13 imaging element 14 lens 16 3rd aperture blade

Claims (9)

An opening forming member having an opening through which light passes;
And a plurality of transverse blades disposed outside the opening of the opening forming member and pivoting in a state of crossing the opening ;
The crossing blade is
The cutting edge of one of the free ends ,
Among the one end, and the rear end portion partially protruding above the cutting edge portion on the opposite side of the blade travel direction,
A narrow neck provided between the rear end and the proximal end to which the driving force is transmitted ;
In the process of narrowing the light passage path in the opening by the plurality of crossing blades disposed outside the opening of the opening forming member,
The crossing blade rotates on the opening while leaving the leading end portion and the rear end portion overlapped in the optical axis direction with the peripheral portion of the opening ,
A portion which does not cover the opening between an edge connecting the leading edge to the rear end of the crossing blade and an edge of the opening, and an edge of the constriction and the opening And a portion not covered with the opening portion is covered with another crossing blade . Communicates with the opening in front Symbol opening forming member has a through hole through which the light passes, a drive ring which rotates around the said opening,
The drive ring is engaged with a plurality of said transverse blade disposed surrounding the opening, the blade drive device according to claim 1, characterized in that rotating the cross blade. Wherein said drive ring on the opening forming member is disposed, further comprising another opening forming member that sandwich the drive ring between the opening forming member,
The crossing blade is disposed between the drive ring and the other opening forming member, and in the optical axis direction, the opening periphery of the other opening forming member and the periphery of the through hole of the driving ring Superimpose on each
The blade drive according to claim 2 , wherein a region where the crossing blade overlaps with the other opening forming member is relatively larger than a region where the crossing blade overlaps with the drive ring. apparatus. The outer shape of the drive ring is provided substantially smaller than the opening forming member;
The opening forming member includes a drive ring accommodating portion that rotatably accommodates the drive ring, and the crossing vane in a state in which the crossing blade is retracted from the opening outside the drive ring accommodating portion of the opening forming member. The blade driving device according to claim 2 or 3 , further comprising: a blade receiving portion for receiving the rear end portion of the blade. The outer shape of the drive ring is provided substantially smaller than the opening forming member;
Between the other opening forming member and the drive ring, a blade traveling space in which the crossing blade travels is formed;
A part of the blade traveling space is provided by cutting out a part of an outer peripheral portion corresponding to the outer side of the drive ring in the opening forming member, and a blade accommodation for accommodating the rear end portion of the crossing blade The blade drive device according to claim 3 , further comprising: Comprising a plurality of said transverse vanes,
The blade drive device according to claim 4 or 5 , wherein at least one of the blade housing portions is provided to commonly receive each rear end portion of the plurality of crossing blades. The cross blade has a protrusion protruding in the blade traveling direction on the proximal end side which is the rotational center of the cross blade.
The projecting portion overlaps, in the optical axis direction, the distal end portion of another crossing blade provided with a rotation center on the opposite side across the opening in a fully open state of the light passage in the opening. The blade drive device according to any one of claims 1 to 6, characterized in that: Quantity regulatory apparatus characterized by using the light intensity regulatory the blade drive device according to any one of claims 1 to 7. Imaging apparatus characterized by comprising a quantity regulatory apparatus of claim 8.

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