JP6049598B2 - Camera blade drive - Google Patents

Description

  The present invention relates to a camera blade drive device including a blade member (shutter blade, diaphragm blade, ND filter blade, etc.) that adjusts the amount of light in a camera, and in particular, a position facing an opening and a position retracted from the opening. The present invention relates to a camera blade driving device including an ND filter blade that swings between the two to adjust the amount of light.

  Conventional camera blade driving devices include a base plate having an opening for an optical path, a diaphragm blade that is supported swingably with respect to the base plate, and moves between a position facing the opening and a retracted position retracted from the opening. , Equipped with a back plate that forms a vane chamber that slidably accommodates the diaphragm blades in cooperation with the ground plate, an electromagnetic actuator provided on the ground plate to drive the diaphragm blades, etc. There has been known one employing a laminated structure in which a flat ND filter is sandwiched between a pair of reinforcing blades having a small diameter (for example, see Patent Document 1).

  However, in this apparatus, since the ND filter is sandwiched between the pair of reinforcing blades and the effective area where the ND filter is exposed is surrounded by the reinforcing blade in an annular shape and is reinforced, the effective area of the ND filter is at least the ground plane. When the ND filter blade is formed with the same area (diameter size) as the opening, the outer diameter of the pair of reinforcing blades is further increased, and therefore wider to retract the ND filter blade from the opening. A space for retreat (occupied area) is required, which leads to an increase in the width and size of the apparatus, and cannot meet the recent demands for downsizing and narrowing of cameras and the like. Further, in the configuration in which the periphery of the effective area of the ND filter is reinforced in an annular shape by the reinforcing plate, the opening is blocked by the annular reinforced portion when the ND filter blade is directed to the opening, and an instantaneous blackout is generated.

  Other camera blade driving devices include a base plate having an opening for an optical path, a center plate and an auxiliary base plate arranged in parallel to the base plate, a position and an opening that are arranged between the center plate and the auxiliary base plate and face the opening. ND filter blades that are swingably supported by the base plate so as to move between the retracted positions retracted from the part, electromagnetic actuators (moving magnet type motors) provided on the base plate to drive the ND filter blades, etc. The ND filter blade is formed by only one flat ND filter, and in order to prevent the ND filter blade from being damaged, the intermediate ground plate and the auxiliary ground plate so that the ND filter blade corresponds to the effective area covering the opening. A recess that is not in contact with the ND filter blade is formed by chemical etching, or an auxiliary base plate is embossed to remove the effective area of the ND filter blade. One provided with two protrusions for sliding the portion is known (for example, see Patent Document 2).

  However, in this apparatus, in the embodiment in which the recesses are formed by performing chemical etching on the intermediate base plate and the auxiliary base plate, it is necessary to use a metal plate as the intermediate base plate and the auxiliary base plate. In the embodiment in which the protrusion is provided by embossing the auxiliary base plate, the processing is similarly required for the embossing and the manufacturing cost. In addition, the embossing tends to cause variations in the height of the protrusions, and the ND filter blades may not be supported movably in a narrow space.

JP 2004-309531 A JP 2005-173133 A

  The present invention has been made in view of the above-described circumstances, and the object of the present invention is to provide an outside of the ND filter blade in order to meet the recent demands for thinning, downsizing, and high functionality of cameras. The area occupied by the contour is reduced as much as possible to reduce the size, thickness, weight, cost, etc. as a whole, and prevent damage to the effective area of the ND filter, etc. It is an object of the present invention to provide a camera blade driving device capable of performing the above adjustment.

The camera blade driving device according to the present invention includes a base plate having an opening for an optical path, a back plate arranged in parallel to the base plate, a position between the base plate and the back plate, and a position facing the opening and a retreat from the opening. An ND filter blade that moves between the ND filter blade and a drive source that swingably drives the ND filter blade, wherein the ND filter blade is an effective area that covers at least the opening. A rail plate is provided that is formed by only a flat ND filter over the region from the free end side to the free end side, and is disposed adjacent to the ND filter blade so that the free end side portion of the ND filter blade is slidably contacted. The ND filter blade is characterized in that it is substantially entirely covered so that at least a part thereof is exposed at a position retracted from the opening .
According to this configuration, since at least the region from the effective region (covering the opening) of the ND filter blade to the free end side is formed by only the flat ND filter, the opening corresponds to the amount corresponding to the absence of the annular reinforcing plate. The outer contour of the region can be reduced, and the ND filter blade can be reduced in size, thickness, weight, cost, etc., and the free end portion of the ND filter blade (the ND filter) can be a rail plate. Since the guide is slidably contacted with each other, it can be reliably operated by compensating for a decrease in strength while preventing damage or the like in the effective region, and therefore a desired light amount adjustment can be performed.
In addition, the occupied area occupied when the ND filter blade is retracted from the opening can be reduced, and downsizing of the entire apparatus can be achieved.
Furthermore, since only the ND filter is formed from the effective region of the ND filter blade to the region on the free end side, no instantaneous blackout occurs when the ND filter blade goes to the opening.

In the above configuration, the ND filter blade is joined to one surface of the ND filter and passes through the support shaft of the base plate and the drive pin of the drive source in the region on the swing fulcrum side outside the effective region covering the opening. The rail plate can include a reinforcing plate having a drive hole through which the reinforcing plate is passed, and the rail plate can be arranged so as to be adjacent to one side of the free end side of the ND filter blade on the side where the reinforcing plate is joined.
According to this configuration, the reinforcing plate is joined in the region on the swing fulcrum side that is out of the effective region of the ND filter blade, so that mechanical strength can be ensured particularly in the region where the driving force of the driving source is exerted. In addition, since the rail plate is arranged on the side where the reinforcing plate is joined, the region from the effective region of the ND filter blade to the free end side (ND filter) is maintained in a flat state, so that the effective region is not damaged. It can guide so that it may move smoothly, preventing.

In the above configuration, the rail plate includes a spacer plate that is disposed adjacent to the reinforcing plate on the side where the ND filter is joined and has a support shaft hole through which the support shaft passes and a drive hole through which the drive pin passes. It is possible to adopt a configuration including two rail plates arranged so as to be adjacent only to both surfaces on the free end side.
According to this configuration, the ND filter blade ND filter is disposed between the reinforcing plate and the spacer plate, and both surfaces on the free end side of the ND filter blade (the ND filter) are slidably supported by the rail plate. Therefore, the ND filter portion can be reliably maintained in a flat state, and can be guided so as to move more smoothly while preventing damage or the like in the effective region.

In the above configuration, the two rail plates can adopt a configuration having substantially the same shape .

In the above configuration, the ND filter blade is formed of only a flat ND filter over the entire area so as to define a support hole through which the support shaft of the main plate passes and a drive hole through which the drive pin of the drive source passes. A spacer plate that is disposed adjacent to one surface of the ND filter blade and has a support shaft hole through which the support shaft passes and a drive hole through which the drive pin passes; The rail plate can adopt a configuration in which the rail plate is disposed so as to be adjacent to one surface on the free end side of the ND filter blade on the side where the spacer plate is disposed.
According to this configuration, the ND filter blades are all formed by the ND filter, and the spacer plate is arranged adjacent to the swing fulcrum side region that is out of the effective region. In this case, mechanical strength can be ensured by the spacer plate, and since the rail plate is arranged on the side where the spacer plate is arranged, the entire area of the ND filter blade (ND filter) is maintained in a flat state. Thus, it is possible to guide so as to move smoothly while preventing damage or the like in the effective region.

In the above configuration, the ND filter blade is formed of only a flat ND filter over the entire area so as to define a support hole through which the support shaft of the main plate passes and a drive hole through which the drive pin of the drive source passes. In the region on the swing fulcrum side deviating from the effective region covering the opening, each of the ND filter blades is disposed adjacent to both sides of the ND filter blade and has a support hole for passing the support shaft and a drive hole for passing the drive pin. It is possible to adopt a configuration that includes two spacer plates, and the rail plates include two rail plates arranged so as to be adjacent to both surfaces of the free end side of the ND filter blade.
According to this configuration, the ND filter blades are all formed by the ND filter, and the ND filter blade (ND filter) is disposed between the two spacer plates, so that both surfaces on the free end side of the ND filter blade (ND filter) are Since each slidably supported by the rail plate, the ND filter blade (ND filter) is surely maintained in a flat state and guided so as to move more smoothly while preventing scratches in the effective area. be able to.

In the configuration in which all the ND filter blades are formed of ND filters, a configuration in which the spacer plate (one spacer plate or two spacer plates) is bonded to the ND filter can be adopted.
According to this configuration, since the spacer plate is joined to the ND filter (which forms the entire area of the ND filter blade), the mechanical strength can be further increased.

In the above configuration, the outer periphery of the ND filter blade includes a curved portion having a shape corresponding to the opening and a straight portion adjacent to the edge of the opening at a position where the ND filter blade is retracted from the opening, and is in sliding contact with the rail plate. A configuration in which the free end side portion is provided between the curved portion and the straight portion can be employed .

In the above configuration, the base plate and the back plate include at least two partition plates arranged so as to form a plurality of blade chambers, the ND filter blades are arranged between the two partition plates, and the rail plate has two partition plates. The structure arrange | positioned so that it may adjoin to a partition plate between boards can be employ | adopted.
According to this configuration, in a configuration in which another blade member (a shutter blade, a diaphragm blade, or the like) is disposed between the base plate and one partition plate and between the back plate and the other partition plate, the ND filter blade and the two partition plates By arranging the rail plate, it is possible to obtain a camera blade driving device having a shutter function, a diaphragm function, and the like in addition to a light amount adjustment function using an ND filter.

  According to the camera blade drive device having the above-described configuration, the occupied area occupied by the outer contour of the ND filter blade can be made smaller than before, and as a whole, while achieving miniaturization, thickness reduction, weight reduction, cost reduction, etc. Especially for cameras suitable for cameras that are capable of stably adjusting the amount of light while preventing damage, etc. in the effective area of the ND filter, and which are required to be thinner, smaller, and more functional in recent years. A blade drive device can be obtained.

It is a disassembled perspective view which shows one Embodiment of the blade drive device for cameras which concerns on this invention. FIG. 2 shows an ND filter blade included in the camera blade drive device shown in FIG. 1, (a) is a plan view of the ND filter blade, and (b) is a free end side from an effective area covering the opening in the ND filter blade. It is the top view which showed the area | region of the cross hatching. FIG. 2 is a plan view showing a state where the ND filter blade is in a position retracted from an opening in the camera blade driving device shown in FIG. 1. FIG. 2 is a plan view showing a state in which the ND filter blade is in a position facing an opening in the camera blade driving device shown in FIG. 1. FIG. 2 shows an assembling procedure in the camera blade driving device shown in FIG. 1, (a) is a plan view showing a state in which one partition plate is assembled to the main plate, and (b) is one partition plate. FIG. 4C is a plan view showing a state where one rail plate is assembled from above, and FIG. 5C is a plan view showing a state where ND filter blades are assembled from above one rail plate. FIG. 2 shows an assembly procedure in the camera blade driving device shown in FIG. 1, (d) is a plan view showing a state in which another rail plate is assembled from above the ND filter blade, and (e) is another rail. The top view which shows the state by which the other partition plate was assembled | attached from on the board, (f) is a top view which shows the state by which the back plate was assembled | attached from the other partition plate. It is a disassembled perspective view which shows other embodiment (The structure which formed the ND filter blade | wing only with the ND filter and has arrange | positioned two spacer plates) other than the camera blade | wing drive device which concerns on this invention. FIG. 8 shows an ND filter blade included in the camera blade driving device shown in FIG. 7, (a) is a plan view of the ND filter blade, and (b) is a free end side from an effective area covering the opening in the ND filter blade. It is the top view which showed the area | region of the cross hatching.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the camera blade driving device according to this embodiment is disposed between a substantially disk-shaped ground plate 10, a back plate 20 disposed in parallel with the ground plate 10, and between the ground plate 10 and the back plate 20. Two partition plates 30, 30, an ND filter blade 40 as a blade member disposed between the two partition plates 30, 30, a spacer plate 50 disposed adjacent to the ND filter blade 40, and the ND filter blade 40 (ND filter 41) Two rail plates 60, 60 that support both surfaces of the free end side so as to be in sliding contact, and an electromagnetic actuator 70 (rotor 71, yoke 72, coil 73) as a drive source provided on the base plate 10. Bobbin integrated presser plate 74 and the like.

  As shown in FIGS. 1, 3, and 4, the base plate 10 has a fan-shaped passage through which an optical path opening 10 a, a support shaft 10 b that rotatably supports the rotor 71, and a drive pin 71 a of the rotor 71 are movable. The through hole 10c, the fixing portion 10d for fixing the holding plate 74, the positioning projection 10e for positioning the partition plates 30 and 30, the support shaft 10f for swingably supporting the ND filter blade 40, and the ND filter blade 40 are opened. Stoppers 10g and 10h for stopping at positions retreated from 10a and positions facing the opening 10a, positioning projections 10i for positioning the rail plates 60 and 60, positioning projections 10j for positioning the back plate 20, and a back plate 20 for assembling A screw hole 10m and the like for screwing the screw B to fasten the latching portion 10k and the back plate 20 are provided.

As shown in FIGS. 1, 3, and 4, the back plate 20 is formed in a substantially circular plate shape having an outer diameter substantially the same as that of the base plate 10, and has an opening portion 20 a having an inner diameter larger than the opening portion 10 a, positioning A hole 20b through which the projection 10e passes, a hole 20c through which the support shaft 10f passes, a hole (or notch) 20d through which the stoppers 10g and 10h pass, a hole 20e through which the positioning projection 10i passes, a hole 20f through which the positioning projection 10j passes, and a hooking of the base plate 10 The part 10k is provided with a latching piece 20g that is latched by a snap fit, a through hole 20h through which the screw B is passed, and the like.
Then, after the two partition plates 30 and 30, the ND filter blade 40, the spacer plate 50, and the two rail plates 60 and 60 are assembled, the back plate 20 is assembled to the base plate 10 so as to cover the whole, and screw Fastened with B.

As shown in FIG. 1, the two partition plates 30 and 30 are formed in a substantially disc shape, and pass through the opening 30 a and the positioning protrusion 10 e that are opened as different diameter openings larger than the opening 10 a in a substantially central region. A hole 30b, a hole 30c through which the support shaft 10f passes, a hole 30d through which the stoppers 10g and 10h pass, a hole 30e through which the positioning projection 10i passes, a hole 30f through which the positioning projection 10j passes, and other holes and notches are provided.
And the two partition plates 30 and 30 are the blade | wings which arrange | position the ND filter blade | wing 40 between the partition plates 30 and 30 by respectively arrange | positioning a predetermined clearance gap between the baseplate 10 and the backplate 20. FIG. A blade chamber in which another blade member (for example, a shutter blade) can be disposed between the base plate 10 and one partition plate 30; and between the back plate 20 and the other partition plate 30 A blade chamber in which other blade members (for example, diaphragm blades) can be arranged can be defined.

As shown in FIGS. 2A and 2B, the ND filter blade 40 includes an ND filter 41 and a reinforcing plate 42 bonded to one surface of the ND filter 41.
The ND filter 41 is formed into a thin plate shape (thickness of about 0.05 mm to 0.1 mm) using an ND filter material, and is indicated by at least an opening 10a (indicated by a two-dot chain line in FIGS. 2A and 2B). It is formed from the effective area covering the circle) to the area on the free end side (area A indicated by cross-hatching in FIG. 2B).
The ND filter 41 is an optical density filter that reduces the amount of light without causing almost any color change, and ND is an abbreviation for Neutral Density.
The reinforcing plate 42 is formed in a contour that does not enter the opening 10a when the ND filter blade 40 moves between the position where the ND filter blade 40 is retracted from the opening 10a and the position facing the opening 10a. A shaft hole 42a through which the shaft passes, a drive hole 42b into which the drive pin 71a of the rotor 71 is inserted, and the like are provided.

The ND filter blade 40 is disposed between the two partition plates 30 and 30 and is supported so as to be swingable through the support shaft 10f of the base plate 10 through the support shaft hole 42a. A driving force is exerted by passing 71a through the driving hole 42b, and it moves between a position retracted from the opening 10a as shown in FIG. 3 and a position facing the opening 10a as shown in FIG. ing.
Here, since at least the area from the effective area (covering the opening 10a) of the ND filter blade 40 to the free end side is formed by only the flat ND filter 41, the area around the effective area is annularly formed by a reinforcing plate as in the prior art. Thus, the outer contour can be made smaller than in the case where the ND filter blade is reinforced, and therefore, the ND filter blade 40 can be reduced in size, thickness, weight, cost, and the like.

As shown in FIG. 1, the spacer plate 50 has a contour that does not enter the opening 10 a and is substantially the same shape and thickness as the reinforcing plate 42 of the ND filter blade 40, and passes the support shaft 10 f of the base plate 10. A support hole 50a, a drive hole 50b for inserting the drive pin 71a of the rotor 71, and the like are provided. The spacer plate 50 may be the same as the reinforcing plate 42.
The spacer plate 50 is disposed adjacent to the reinforcing plate 42 on the side where the ND filter 41 is joined with respect to the ND filter blade 40, passes the support shaft 10f of the base plate 10 through the support shaft hole 50a, and the rotor 71. By passing the drive pin 71a through the drive hole 50b, the joint area of the ND filter 41 is sandwiched in cooperation with the reinforcement plate 42 and moved together with the reinforcement plate 42.

As shown in FIGS. 1, 3, and 4, the two rail plates 60, 60 are formed in a flat plate shape having the same thickness as the reinforcing plate 42 and the spacer plate 50, and are on the free end side of the ND filter blade 40. Are provided with curved regions 60a and 60a for sliding the surfaces, holes 60b and 60b for passing the positioning projections 10i, and the like.
The two rail plates 60, 60 are positioned so as to be adjacent to the respective partition plates 30, 30 while being positioned by the positioning protrusions 10i of the base plate 10 between the two partition plates 30, 30, and ND filters. When the blade 40 swings between a position retracted from the opening 10a and a position facing the opening 10a, both surfaces on the free end side of the ND filter blade 40 are brought into sliding contact with the curved regions 60a and 60a. Supports and guides.
In this way, the two rail plates 60, 60 support both sides of the free end side of the ND filter blade 40 (the ND filter 41) in a slidable manner, so that the portion of the ND filter 41 is surely flat. The state can be maintained and the ND filter 41 can be smoothly moved while being prevented from being damaged in the effective region.
In particular, since the two rail plates 60, 60 are formed to have the same thickness as the reinforcing plate 42 and the spacer plate 50, the ND filter blade 40 (particularly, the portion of the ND filter 41) is deformed. In addition, it can be supported in a flat plate so as to be movable with high accuracy, and it is possible to reliably prevent damage or the like in the effective region.

As shown in FIG. 1, the electromagnetic actuator 70 includes a rotor 71 that rotates within a predetermined angular range, a yoke 72 that forms a magnetic path, an exciting coil 73, a pressing plate 74, and the like.
The rotor 71 includes a drive pin 71a connected to the drive hole 42b of the ND filter blade 40 and the drive hole 50b of the spacer plate 50, a cylindrical magnet 71b, and the like, and rotates a predetermined angle range by the support shaft 10b of the base plate 10. It is supported freely.
The yoke 72 is formed in a substantially U shape so that the two magnetic pole portions are fitted and fixed in the fitting holes of the presser plate 74 so as to face the outer peripheral surface of the rotor 71.
The coil 73 is wound around a bobbin portion integrally formed with the presser plate 74.
The holding plate 74 integrally includes a fitting hole into which the yoke 72 is fitted and a bobbin portion around which the coil 73 is wound, and the base plate 10 is fixed so as to prevent the rotor 71 fitted into the support shaft 10b from falling off. It is fixed to the part 10d.

Next, the assembly of the camera blade driving device having the above-described configuration will be described with reference to FIGS.
First, in the state where the electromagnetic actuator 70 is attached to the front side of the main plate 10, as shown in FIG. 5A, one partition plate 30 is attached.
Subsequently, as shown in FIG. 5B, one rail plate 60 is attached from one partition plate 30 so as to be adjacent to the partition plate 30.
Subsequently, as illustrated in FIG. 5C, the ND filter blades 40 are attached from above the partition plate 30 and the rail plate 60. Here, when the ND filter blade 40 is attached, the reinforcing plate 42 is adjacent to the partition plate 30, and one surface on the free end side of the ND filter blade 40 (one surface of the ND filter 41) is a curved region of the rail plate 60. It is attached so as to be in sliding contact with 60a.
Subsequently, as shown in FIG. 6 (a), the spacer plate 50 is attached so as to overlap the reinforcing plate 42 from above the ND filter blade 40, and is also overlapped with the assembled rail plate 60. The rail plate 60 is attached. Accordingly, the other surface on the free end side of the ND filter blade 40 (the other surface of the ND filter 41) is supported so as to be in sliding contact with the curved region 60a of the other rail plate 60.
That is, in this state, the ND filter blade 40 (the ND filter 41) is supported such that both surfaces on the free end side are in sliding contact with the rail plates 60 and 60, respectively.
Subsequently, as shown in FIG. 6B, another partition plate 30 is arranged and attached from above the spacer plate 50 and the other rail plate 60.
Finally, as shown in FIG. 6C, the back plate 20 is attached from above the partition plate 30 and fastened to the base plate 10 with screws B.
As described above, when assembling the apparatus, the components are assembled so as to be sequentially overlapped to complete the assembly of the apparatus, so that the assembling work can be easily performed.

According to the camera blade driving device having the above-described configuration, at least the effective region (covering the opening 10a) of the ND filter blade 40 from the free region is formed by only the flat ND filter 41. The outer contour of the region corresponding to the opening 10a can be made smaller by the absence of an annular reinforcing plate, and the ND filter blade 40 can be reduced in size, thickness, weight, cost, and the like. Since the free end portion of the filter blade 40 (the ND filter 41) is guided by being brought into sliding contact with the rail plates 60, 60, it is reliably operated while compensating for a decrease in strength and preventing damage or the like in the effective region. Therefore, a desired light amount adjustment can be performed.
In addition, since the outer diameter of the effective area of the ND filter blade 40 can be reduced, the occupied area when the ND filter blade 40 retracts from the opening 10a can be reduced, and the overall size of the apparatus can be reduced. Can do.
In particular, the ND filter 41 of the ND filter blade 40 is disposed between the reinforcing plate 42 and the spacer plate 50, and both surfaces on the free end side of the ND filter blade 40 (the ND filter 41) are rail plates 60 and 60, respectively. Therefore, the ND filter 41 can be reliably maintained in a flat state, and can be guided so as to move smoothly while preventing damage or the like in the effective region.
Furthermore, since only the ND filter 41 is formed from the effective region of the ND filter blade 40 to the region on the free end side, an instantaneous blackout occurs when the ND filter blade 40 moves toward the opening 10a. Nor.

In the above embodiment, the configuration in which the two rail plates 60 and 60 and the spacer 50 are employed has been described. However, the present invention is not limited to this. For example, the spacer plate 50 is eliminated and one rail plate 60 is provided. Alternatively, a configuration may be adopted in which only one rail plate 60 is disposed so as to be adjacent to one side of the free end side of the ND filter blade 40 on the side where the reinforcing plate 42 is joined.
Also in this configuration, the reinforcing plate 42 is joined in the region on the swing fulcrum side that is out of the effective region of the ND filter blade 40, so that mechanical strength can be ensured particularly in the region where the driving force of the rotor 71 is exerted. In addition, since the rail plate 60 is disposed on the side to which the reinforcing plate 42 is joined, the region from the effective region of the ND filter blade 40 to the free end side (ND filter 41) is maintained in a planar state, It can be guided so as to move smoothly while preventing damage and the like.
Moreover, in the said embodiment, although the structure which arrange | positions the spacer board 50 adjacent to the reinforcement board 42 was shown, it is not limited to this, The spacer board 50 is joined to the ND filter 41 and the reinforcement board 42. A configuration may be adopted.
According to this configuration, the spacer plate 50 is joined to the ND filter 41 and the reinforcing plate 42, whereby the mechanical strength can be further increased in cooperation with the reinforcing plate 42.
Furthermore, in the said embodiment, in the structure provided with the two partition plates 30 and 30, the structure which arrange | positions the two rail plates 60 and 60 adjacently between them was shown, However, It is limited to this Instead, if the configuration does not employ other blade members, the two partition plates 30 and 30 are eliminated, and the two rail plates 60 and 60 are arranged adjacent to the base plate 10 and the back plate 20, respectively. May be.

7 and 8 show another embodiment of the camera blade driving device according to the present invention, which is the same as the above-described embodiment except that the ND filter blade is changed and two spacer plates are employed. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.
As shown in FIG. 7, the camera blade drive device according to this embodiment is a blade member disposed between the base plate 10, the back plate 20, the two partition plates 30 and 30, and the two partition plates 30 and 30. ND filter blades 140, two spacer plates 150 disposed adjacent to both surfaces of the ND filter blades 140, and two rail plates 60 and 60 that support both surfaces of the ND filter blades 140 on the free end side so as to be in sliding contact with each other. And an electromagnetic actuator 70 as a drive source.

  As shown in FIGS. 8A and 8B, the ND filter blade 140 is a thin plate (0.05 mm to 0.1 mm thick) with only a flat ND filter (ND filter material) over the entire area. ). That is, the ND filter blade 140 has an opening 10a (FIGS. 8A and 8B) so as to define a support hole 140a through which the support shaft 10f of the main plate 10 passes and a drive hole 140b through which the drive pin 71a of the rotor 71 passes. In addition to the free end side region (region A shown by cross-hatching in FIG. 8B) from the effective region that covers the circle indicated by the two-dot chain line in FIG. The entire region including the region is formed of only the ND filter.

As shown in FIG. 7, the two spacer plates 150 and 150 do not enter the opening 10a when the ND filter blade 140 moves between a position retracted from the opening 10a and a position facing the opening 10a. A shaft hole 150a that is formed in a contour and allows the shaft 10f of the main plate 10 to pass through, a drive hole 150b into which the drive pin 71a of the rotor 71 is inserted, and the like are provided.
The two spacers 150 and 150 pass the support shaft 10f of the main plate 10 through the support shaft hole 150a and pass the drive pin 71a of the rotor 71 through the drive hole 150b, thereby covering the (opening 10a) of the ND filter blade 140. It moves together with the ND filter blade 140 while sandwiching the region on the swing fulcrum side (outside the effective region).

According to this embodiment, the ND filter blades 140 are all formed of only ND filters, the ND filter blades 140 (ND filters) are disposed between the two spacer plates 150, 150, and the ND filter blades 140 (ND filters). Since both sides of the free end side are supported by the rail plates 60 and 60 so as to be slidable, the ND filter blade 140 (ND filter) is securely maintained in a flat state, and scratches or the like in the effective area are prevented. It can guide so that it may move smoothly, preventing.
In addition, since all the ND filter blades 140 are formed of only the ND filter, an instantaneous blackout does not occur when the ND filter blades 140 go to the opening 10a.

In the above-described embodiment, the configuration in which the two rail plates 60 and 60 and the two spacers 150 are employed is shown. However, the present invention is not limited to this. For example, one spacer plate 150 and one rail plate are used. 60 may be employed, and one rail plate 60 may be disposed so as to be adjacent to one side of the free end side of the ND filter blade 140 on the side where the spacer plate 150 is disposed.
Also in this configuration, since the spacer plate 150 is disposed adjacent to the swing fulcrum side region outside the effective region of the ND filter blade 140, the mechanical strength is ensured particularly in the region where the driving force of the rotor 71 is exerted. In addition, since the rail plate 60 is disposed on the side where the spacer plate 150 is disposed, the entire area of the ND filter blade 140 (ND filter) is maintained in a flat state, and scratches or the like in the effective region can be prevented. It can guide so that it may move smoothly, preventing.
Moreover, in the said embodiment, in the structure which formed all the ND filter blades 140 with the ND filter, the structure which arrange | positions the 1 or 2 spacer board 150 adjacent to the single side | surface (or both surfaces) of the ND filter blade 140 is shown. However, the present invention is not limited to this, and a configuration in which one spacer plate 150 is joined to one side of the ND filter (which forms the entire area of the ND filter blade 140) or two spacer plates 150 and 150 (an ND filter blade). It is also possible to employ a configuration in which both surfaces of the ND filter (forming the entire area 140) are joined.
According to this configuration, since the spacer plate 150 is joined to the ND filter (ND filter blade 140), the mechanical strength can be further increased.
Furthermore, in the said embodiment, in the structure provided with the two partition plates 30 and 30, the structure which arrange | positions the two rail plates 60 and 60 adjacently between them was shown, However, It is limited to this Instead, if the configuration does not employ other blade members, the two partition plates 30 and 30 are eliminated, and the two rail plates 60 and 60 are arranged adjacent to the base plate 10 and the back plate 20, respectively. May be.

In the above embodiment, only the ND filter blades 40 and 140 are used as the blade members, and only the electromagnetic actuator 70 that drives the ND filter blades 40 and 140 is used as the drive source. Although it is shown, the present invention is not limited to this, and the present invention includes a configuration in which the shutter member includes a shutter blade or an aperture blade, and the drive source includes an electromagnetic actuator that drives the shutter blade and an electromagnetic actuator that drives the aperture blade. May be adopted.
In this case, it is possible to obtain a camera blade driving device having a shutter function using a shutter blade, a diaphragm function using a diaphragm blade, and the like in addition to a light amount adjustment function using an ND filter.

  As described above, the camera blade drive device of the present invention can reduce the occupied area occupied by the outer contour of the blade member, and as a whole, while achieving downsizing, thinning, weight reduction, cost reduction, etc. In particular, since it is possible to stably adjust the amount of light while preventing damage or the like in the effective area of the ND filter, it can be applied to cameras and the like that have recently been required to be thinner, smaller, and more functional. Of course, it is also useful in other cameras and optical equipment.

DESCRIPTION OF SYMBOLS 10 Base plate 10f Support shaft 10a Opening part 20 Back plate 30 Partition plate 40,140 ND filter blade | wing 41 ND filter A Area | region 42 from the effective area | region to free end side Reinforcement board 42a, 140a Support shaft hole 42b, 140b Drive hole 50,150 Spacer Plates 50a and 150a Support shaft holes 50b and 150b Drive hole 60 Rail plate 60a Curved region (region where the surface on the free end side of the ND filter is in sliding contact)
70 Electromagnetic actuator (drive source)
71 Rotor 71a Drive pin

Claims (6)

A base plate having an opening for an optical path, a back plate disposed in parallel with the base plate, and a position between the base plate and the back plate and a position facing the opening and a position retracted from the opening. A camera blade drive device comprising: a moving ND filter blade; and a drive source for driving the ND filter blade in a swingable manner.
The ND filter blade is formed only with a flat ND filter from an effective area covering at least the opening to an area on the free end side,
A rail plate disposed adjacent to the ND filter blade to slidably move the free end side portion of the ND filter blade ;
The ND filter blade is substantially entirely covered so that at least a part is exposed at a position retracted from the opening,
The ND filter blade is joined to one surface of the ND filter in the region on the swing fulcrum side that is outside the effective region covering the opening, and the shaft hole through which the shaft of the base plate passes and the drive of the drive source Including a reinforcing plate having a drive hole through which the pin passes;
The rail plate is arranged so as to be adjacent to one side of the free end side of the ND filter blade on the side where the reinforcing plate is joined,
A spacer plate disposed adjacent to the reinforcing plate on the side to which the ND filter is joined and having a support hole for passing the support shaft and a drive hole for passing the drive pin;
The rail plate includes two rail plates arranged so as to be adjacent only to both surfaces on the free end side of the ND filter blade,
The two rail plates are camera blade driving devices having substantially the same shape . The ND filter blade is formed of only a flat ND filter over the entire area so as to define a support hole through which the support shaft of the base plate passes and a drive hole through which the drive pin of the drive source passes.
In a region on the swing fulcrum side deviating from an effective region covering the opening of the ND filter blade, a support shaft hole and the drive pin that are disposed adjacent to one surface of the ND filter blade and pass the support shaft are provided. Including a spacer plate having a drive hole therethrough,
The rail plate, the spacer plate is disposed adjacent to the one side of the free end side of the ND filter blade in arranged side camera blade drive device according to 請 Motomeko 1. The ND filter blade is formed of only a flat ND filter over the entire area so as to define a support hole through which the support shaft of the base plate passes and a drive hole through which the drive pin of the drive source passes.
In the region on the swing fulcrum side deviating from the effective region that covers the opening of the ND filter blade, the support shaft hole that is adjacently disposed so as to sandwich both surfaces of the ND filter blade and passes the support shaft; Including two spacer plates each having a drive hole for passing a drive pin;
The rail plate, the ND filter blade two rail plate including which are disposed adjacent to both sides of the free end side of the camera for the blade drive device according to 請 Motomeko 1. The spacer plate is bonded to the ND filter, a camera blade drive device according to 請 Motomeko 2 or 3. The outer periphery of the ND filter blade includes a curved portion having a shape corresponding to the opening, and a linear portion that is close to the edge of the opening at a position where the ND filter blade is retracted from the opening,
Portion of the rail plate and the sliding contact free end, said curved portion and Ru provided between the straight portion, a camera blade drive device according to any one of 請 Motomeko 1-4. Between the main plate and the back plate, including at least two partition plates arranged to form a plurality of blade chambers,
The ND filter blade is disposed between the two partition plates,
The rail plate, the two in the partition plates are disposed adjacent to the partition plate, camera blade drive device according to any one of 請 Motomeko 1-5.

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