JP5922636B2 - 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.

As a conventional camera blade driving device, a ground plate having a circular opening for an optical path, an intermediate plate having a circular opening for an optical path and a parallel opening to the ground plate, and being arranged in parallel with the intermediate plate A cover plate having a circular opening for an optical path, two shutter blades arranged between the base plate and the intermediate plate and moving between a position facing the opening and a position retracted from the opening; an intermediate plate; Provided with a filter blade disposed between the cover plates and moving between a position facing the opening and a position retracted from the opening, a shutter blade, and an electromagnetic actuator provided on the ground plate for driving each filter blade The filter blade is attached to a reinforcing blade having a circular opening having an inner diameter larger than the openings of the intermediate plate and the cover plate, and an ND filter plate attached to the reinforcing blade so as to cover the opening. Ri configured, those formed sufficiently larger than the opening of the outer contour intermediate plate and the cover plate of the filter blade is known (e.g., see Patent Document 1).
In this apparatus, the filter blades are sufficiently large (wide) with respect to the openings of the intermediate plate and the cover plate, so that the inertia force or the driving force of the electromagnetic actuator when the filter blades are continuously operated, etc. Therefore, even when the filter blade is bent and overrun, the outer edge of the filter blade collides with the inner edge of the opening of the intermediate plate and the cover plate, resulting in a malfunction due to the outer edge and the inner edge being caught or entangled. hard.

  However, in response to demands for downsizing, narrowing, etc. in recent cameras, etc., the outer contours of the filter blades are formed to be small in an arc shape with the above configuration, and are brought close to the circular openings of the intermediate plate and the cover plate. Then, there is a possibility that the outer edge part may collide with the inner edge part of the opening part of the intermediate plate and the cover plate. Therefore, the width and the size of the filter blade (blade member) are narrowed with such a conventional configuration. It was difficult to achieve the above.

JP 2005-338691 A

  The present invention has been made in view of the above circumstances, and its object is to provide an outer contour of a blade member in order to meet the recent demands for thinning, downsizing, and high functionality of cameras. Occupies as small an area as possible as a whole to reduce the size, thickness, weight, cost, etc., while opening the inner plate, cover plate, partition plate, etc. of the adjacent blade member The blade drive device for a camera capable of stably operating the blade member (ND filter blade, shutter blade, diaphragm blade, etc.) by preventing the blade member (outer edge portion) from colliding, catching, entanglement, etc. Is to provide.

The camera blade driving device of the present invention includes a ground plate having a first opening , a flat plate member having a second opening larger than the first opening at a position corresponding to the first opening, and a flat plate member. and the blade member to pivot between an adjacent disposed actuated position covering the first opening and a retracted position retracted from the first opening, a driving source Ru rotate the blade members about a predetermined position The blade member for a camera includes a blade member having an outer edge portion larger than the first opening portion , and the second opening portion has an outer edge when the blade member rotates from the operating position to the retracted position. It is characterized by having an inner edge part that moves relatively while intersecting the part in a bowl shape .
In the above configuration, the inner edge portion relatively intersects the outer edge portion in a bowl shape when the blade member rotates from the operating position to the retracted position and when the blade member rotates from the retracted position to the operating position. A moving configuration can be employed.

In the above configuration, the first opening is a circular opening for an optical path , and the flat plate member is disposed in parallel with the base plate to define a blade chamber that houses the blade member and has a second opening. And the second opening of the partition plate has an arcuate inner edge having a larger radius of curvature than the circular opening, and is continuous and tapered at both ends of the arcuate inner edge with a radius of curvature larger than the arcuate inner edge. at Close is formed to include a substantially V-shaped inner edges, the blade member is adapted to move toward the operating position from the side of the substantially V-shaped inner edge, arcuate outer edge forms a predetermined radius of curvature It is possible to adopt the configuration formed in the above .

In the above configuration, the outer edge of the blade member is formed so as to form an arc-shaped inner edge substantially the same radius of curvature of the second opening portion of the partition plate, it is possible to adopt a configuration.

In the above-described configuration, the blade member is an ND filter blade formed by only a flat ND filter from an effective region covering at least the first opening to a region on the free end side .

The said structure can employ | adopt the structure which is a diaphragm blade | wing which has a 3rd opening part which makes a shutter blade | wing which opens and closes a 1st opening part, or the aperture diameter smaller than a 1st opening part .

In the above configuration, as ground plane, comprising a substantially circular Omogai contour, the convex outer contour portion protruding from Omogai contour so as to cover the outer edge of the blade member when the blade member to the retracted position Is formed .

  According to the camera blade drive device having the above configuration, the area occupied by the outer contour of the blade member is reduced, and as a whole, the blade member is achieved while being reduced in size, thickness, weight, and cost. Prevents the blade member (outer edge portion) from colliding with the opening (inner edge portion) of the adjacent flat plate member (intermediate plate, cover plate, partition plate, etc.), hooked, entangled, etc. Blades, shutter blades, diaphragm blades, etc.) can be stably operated, and a camera blade driving device suitable for a camera that is required to be thin, small, highly functional in recent years 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 is a plan view showing a state in which the blade member (ND filter blade) is located at a retracted position retracted from the circular opening of the main plate in the camera blade driving device shown in FIG. 1. FIG. 2 is a plan view showing a state in which a blade member (ND filter blade) is located at an operating position facing a circular opening of a base plate in the camera blade driving device shown in FIG. 1. It is a top view which shows the flat member (partition plate) contained in the blade drive device for cameras shown in FIG. It is a top view which shows the ND filter blade | wing as a blade | wing member contained in the blade drive device for cameras shown in FIG. In the camera blade drive device shown in FIG. 1, it is an operation diagram showing the relationship between the blade member (ND filter blade) and the opening of the flat plate member (partition plate), (a) blade member (ND filter blade) FIG. 4B is a plan view showing a state where the blade member (ND filter blade) is slightly moved toward the retracted position. FIG. FIG. 3 is an operation diagram showing the relationship between the blade member (ND filter blade) and the opening of the flat plate member (partition plate) in the camera blade drive device shown in FIG. 1, and (c) is the blade member (ND filter blade). FIG. 6B is a plan view showing a state in which the blade member (ND filter blade) has moved further toward the retracted position. FIG. is there. 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. It is a top view which shows the state by which the blade | wing member (ND filter blade | wing) was assembled | attached from the top. FIG. 2 shows an assembling procedure in the camera blade driving device shown in FIG. 1, (c) is a plan view showing a state in which another partition plate is assembled from above the blade member (ND filter blade); FIG. 5 is a plan view showing a state in which a back plate is assembled from above another partition plate. FIG. 2 shows another embodiment of a blade member included in the camera blade driving device shown in FIG. 1, wherein (a) is a plan view showing a shutter blade as a blade member, and (b) is a diaphragm blade as a blade member. FIG.

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 and 30 as flat plate members, an ND filter blade 40 as a blade member disposed between the two partition plates 30 and 30, and an electromagnetic actuator 50 as a drive source provided on the ground plate 10 ( A rotor 51, a yoke 52, a coil 53, a bobbin integrated holding plate 54, and the like.

As shown in FIGS. 1, 2, and 3, the main plate 10 has a circular opening 10a for the optical path, a support shaft 10b that rotatably supports the rotor 51, and a fan-shaped passage through which the drive pin 51a of the rotor 51 is movable. The through hole 10c, the fixing portion 10d for fixing the presser plate 54, 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 being opened. Stoppers 10g and 10h for stopping at the retracted position retracted from the portion 10a and the operating position facing the opening 10a, positioning protrusions 10i for positioning the back plate 20, latching portions 10j for assembling the back plate 20, and the back plate 20 A screw hole 10k for screwing the screw B to be fastened is provided.
Further, the main plate 10 has a substantially circular main outer contour portion 10m and a protrusion protruding from the main outer contour portion 10m so as to cover the rear outer edge portion 40b of the ND filter blade 40 when the ND filter blade 40 is in the retracted position. It is formed so as to include the outer contour portion 10n.

As shown in FIGS. 1, 2, and 3, the back plate 20 is formed so as to have substantially the same outer contour as the base plate 10, and has a circular opening 20a and a positioning projection 10e having an inner diameter larger than the circular opening 10a. A hole 20b through which the 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, and a hooking portion 10k of the base plate 10 are hooked by snap fitting. A latching piece 20j, a through hole 20k through which the screw B is passed, and the like are provided.
Further, the back plate 20 protrudes from the main outer contour portion 20m so as to cover the substantially circular main outer contour portion 20m and the rear outer edge portion 40b of the ND filter blade 40 when the ND filter blade 40 is in the retracted position. It is formed so as to include the convex outer contour portion 20n.
And after the two partition plates 30 and 30 and the ND filter blade | wing 40 are integrated, the back plate 20 is assembled | attached to the baseplate 10 so that the whole may be covered, and it is fastened with the screw | thread B.

As shown in FIGS. 1 and 4, the two partition plates 30 and 30 are formed in a substantially disc shape, and pass through an opening 30 a and a positioning protrusion 10 e that are larger than the circular 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, and other holes and notches are provided.
As shown in FIG. 4, the opening 30a has an arcuate inner edge 30a ′ having a larger radius of curvature than the circular opening 10a, and an arcuate inner edge 30a ′ having a larger radius of curvature than the arcuate inner edge 30a ′. Are formed so as to include a substantially V-shaped inner edge portion 30a ″ that is continuous with both ends of the plate and is tapered (on the straight line L).

Further, when the ND filter blade 40 is located at the operating position, the substantially outer V-shaped inner edge portion 30a '' of the opening 30a is formed at the rear outer edge portion 40b of the ND filter blade 40 as shown in FIG. When the ND filter blade 40 moves from the operating position to the retracted position, the ND filter blade 40 is relatively crossed with the rear outer edge portion 40b of the ND filter blade 40 in a bowl shape. It is formed to move to.
Of the two partition plates 30, 30, the opening 30 a of the partition plate 30 disposed on the side away from the base plate 10 has a base plate 10 in view of optical characteristics such as light refraction, diffraction, and required aperture. The opening is formed in a similar shape that is slightly larger than the opening 30a of the partition plate 30 disposed on the side close to.

As shown in FIGS. 5A and 5B, the ND filter blade 40 includes an ND filter 41 and a reinforcing plate 42 bonded to one surface of the ND filter 41, and includes an opening 30a (and a circular opening 10a). ) Is formed so as to include a front outer edge portion 40a located on the side toward the rear side) and a rear outer edge portion 40b located on the opposite side of the front outer edge portion 40a.
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 at least a circular opening 10a (in FIG. 5A and FIG. (Circle shown) is formed from the effective region covering the free end side region.
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.
When the ND filter blade 40 moves between the retracted position where the ND filter blade 40 is retracted from the opening 30a and the circular opening 10a and the operating position facing the opening 30a and the circular opening 10a, the reinforcing plate 42 moves to the circular opening 10a. It is formed in a contour that does not enter, and is provided with a support hole 42a through which the support 10f of the main plate 10 passes, a drive hole 42b into which the drive pin 51a of the rotor 51 is inserted, and the like.

  Furthermore, as shown in FIG. 4, the front outer edge portion 40a of the ND filter blade 40 is formed in a substantially straight shape, and the rear outer edge portion 40b of the ND filter blade 40 is formed in an arc shape having a predetermined radius of curvature, The arcuate inner edge 30a ′ of the opening 30a of the partition plate 30 is formed to have a curvature radius substantially the same (approximate). In addition, the ND filter blade | wing 40 can be narrowed and reduced in size in an optimal state by selecting suitably the curvature radius of the rear side outer edge part 40b.

The ND filter blade 40 having the above-described configuration is disposed between the two partition plates 30, 30, and is supported so as to be swingable through the support shaft 10 f of the base plate 10 through the support shaft hole 42 a. Driving force is exerted by passing the driving pin 51a through the driving hole 42b, and the retracted position retracted from the circular opening 10a (and the opening 30a) as shown in FIG. 2 and the circular opening 10a (as shown in FIG. 3). And an operating position facing the opening 30a).
Thus, since at least the region from the effective region (covering the circular opening 10a) of the ND filter blade 40 to the free end side is formed only by the flat ND filter 41, a reinforcing plate is provided around the effective region as in the prior art. Therefore, the outer contour can be reduced as compared with the case where the ND filter blade 40 is reinforced in an annular shape. Therefore, the ND filter blade 40 can be reduced in size, thickness, weight, cost, and the like.

Here, the relative movement relationship between the partition plate 30 (the opening 30a thereof) and the ND filter blade 40 (the front outer edge portion 40a and the rear outer edge portion 40b thereof) will be described. The ND filter blade 40 is shown in FIG. When moving from the retracted position to the operating position shown in FIG. 3, the front outer edge 40 a partially faces (enters) the substantially V-shaped inner edge 30 a ″ of the opening 30 a from the arc-shaped inner edge. While passing through 30 a ′, the rear outer edge portion 40 b moves so as to face (enter) the substantially V-shaped inner edge portion 30 a ″ of the opening 30 a.
In this moving process, the front outer edge portion 40a that forms a straight line always forms an angle that intersects the inner edge portion (substantially V-shaped inner edge portion 30a ″, arcuate inner edge portion 30a ′) of the opening 30a in a bowl shape. Therefore, it is possible to prevent the front outer edge portion 40a from colliding with the inner edge portion (particularly, the arc-shaped inner edge portion 30a ′) of the opening portion 30a and causing a catch or entanglement, thereby ensuring a smooth operation.

On the other hand, when the ND filter blade 40 returns after being overrun (overtravel) due to continuous movement or overdrive force of the drive source, or when moving from the operating position toward the retracted position, FIG. ), (B) and FIGS. 7 (a), 7 (b), and 2, the rear outer edge portion 40b retreats outward from the substantially V-shaped inner edge portion 30a '' of the opening 30a. ), The front outer edge 40a faces (enters) the arcuate inner edge 30a of the opening 30a, and then moves so as to face the substantially V-shaped inner edge 30a '' of the opening 30a.
In this moving process, the front outer edge portion 40a that forms a straight line always forms an angle that intersects the inner edge portion (substantially V-shaped inner edge portion 30a ″, arcuate inner edge portion 30a ′) of the opening 30a in a bowl shape. In particular, the rear outer edge portion 40b having a circular arc shape moves backward with an angle that always intersects the substantially V-shaped inner edge portion 30a ″ of the opening 30a (not parallel) in a bowl shape. Further, it is possible to prevent the rear outer edge portion 40b of the ND filter blade 40 from colliding with the substantially V-shaped inner edge portion 30a ″ of the opening portion 30a to cause a catch or entanglement, thereby ensuring a smooth operation.

  In this way, in particular, the rear outer edge portion 40b of the ND filter blade 40 is prevented from colliding with the inner edge portion (substantially V-shaped inner edge portion 30a ″) of the opening portion 30a to prevent the ND filter blade 40 from being caught or entangled. Thus, the outer contour of the ND filter blade 40 can be reduced to a size close to the circular opening 10a of the ground plane 10 that defines the diameter of the optical path, and the ND filter blade 40 is retracted. The occupied area in the position can be reduced, and the overall size of the apparatus can be reduced.

As shown in FIG. 1, the electromagnetic actuator 50 includes a rotor 51 that rotates within a predetermined angular range, a yoke 52 that forms a magnetic path, an exciting coil 53, a pressing plate 54, and the like.
The rotor 51 includes a drive pin 51 a connected to the drive hole 42 b of the ND filter blade 40, a cylindrical magnet 51 b, and the like, and is supported by a support shaft 10 b of the base plate 10 so as to be rotatable within a predetermined angle range.
The yoke 52 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 54 so as to face the outer peripheral surface of the rotor 51.
The coil 53 is wound around a bobbin portion integrally formed with the presser plate 54.
The holding plate 54 integrally has a fitting hole into which the yoke 52 is fitted and a bobbin portion around which the coil 53 is wound, and the base plate 10 is fixed so as to prevent the rotor 51 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 50 is attached to the front side of the main plate 10, as shown in FIG. 8A, one partition plate 30 is attached.
Subsequently, as shown in FIG. 8B, the ND filter blades 40 are attached from one partition plate 30 so as to be adjacent to the partition plate 30.
Subsequently, as shown in FIG. 9C, another partition plate 30 is disposed and attached from above the ND filter blade 40.
Finally, as shown in FIG. 9 (d), 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 drive device having the above-described configuration, when the ND filter blade 40 moves back from the retracted position to the operating position and returns after overrun (overtravel), the rear outer edge portion 40b of the ND filter blade 40 is returned. Is retreating at an angle that always intersects the inner edge (substantially V-shaped inner edge 30a ″) of the opening 30a (not parallel) at an angle that always intersects the hook, and therefore the rear outer edge 40b of the ND filter blade 40 Can be prevented from colliding with the inner edge of the opening 30a to cause catching and entanglement to ensure smooth operation. Therefore, the outer contour of the ND filter blade 40 is defined as the ground plane that defines the diameter of the optical path. The size can be reduced to a size close to 10 circular openings 10a. Thereby, the occupation area in the state in which the ND filter blade 40 is in the retracted position can be reduced, and downsizing of the entire apparatus can be achieved.
In particular, since the main plate 10 is formed to include a substantially circular main outer contour portion 10m and a convex outer contour portion 10n, the rear outer edge portion 40b of the ND filter blade 40 is accommodated in the convex outer contour portion 10n. In this way, the other regions can have outer contours with smaller outer diameters, and further downsizing and the like can be achieved as a whole device.

In the above embodiment, the case where the ND filter blade 40 is employed as the blade member and the present invention is employed in the relationship between the ND filter blade 40 and the partition plate 30 is shown, but the present invention is not limited thereto. As a blade member, as shown in FIGS. 10A and 10B, a shutter blade 140 that opens and closes the circular opening 10a or a shutter blade 240 that has an opening 240c that has a smaller diameter than the circular opening 10a. The present invention may be adopted in a configuration including
As described above, even when the present invention is applied to the shutter blades 140 and the diaphragm blades 240, the outer contours of the shutter blades 140 and the diaphragm blades 240 can be reduced, thereby achieving downsizing, thinning, weight reduction, cost reduction, and the like. In addition, it is possible to prevent the outer edge of the shutter blade 140 and the diaphragm blade 240 from colliding with the inner edge of the opening 30a to cause a catch or entanglement, thereby ensuring a smooth operation.
In the said embodiment, although the partition plate 30 which has the opening part 30a was shown as a flat member which has an opening part, it is not limited to this, Instead of the partition plate 30, an intermediate | middle board, a cover board, A back plate or the like may be applied, and when a circular opening as an optical path is defined by a member other than the ground plate, the ground plate may be applied as a flat plate member.

  As described above, the camera blade driving device of the present invention reduces the occupied area occupied by the outer contour of the blade member, and achieves overall reduction in size, thickness, weight, cost, etc. The blade member prevents the blade member (outer edge portion) from colliding with the opening (inner edge portion) of the flat plate member (intermediate plate, cover plate, partition plate, etc.) adjacent to the blade member, being caught, entangled, etc. (ND filter blades, shutter blades, diaphragm blades, etc.) can be operated stably, so that it can be applied to cameras that are required to be thinner, smaller, and more functional in recent years. It is also useful in other cameras and optical equipment.

DESCRIPTION OF SYMBOLS 10 Base plate 10a Circular opening part 10m Main outer contour part 10n Convex outer contour part 20 Back plate 20m Main outer contour part 20n Convex outer contour part 30 Partition plate (flat plate member)
30a Opening 30a ′ Arc-shaped inner edge 30a ″ substantially V-shaped inner edge 40 ND filter blade 40a Front outer edge 40b Rear outer edge 41 ND filter 42 Reinforcing plate 50 Electromagnetic actuator (drive source)
140 Shutter blade 240 Aperture blade 240c Opening

Claims (4)

A ground plane for a light path and having a circular first opening, a flat plate member having a second opening larger than the first opening at a position corresponding to the first opening, and adjacent to the flat plate member A blade member that rotates between a working position that covers the first opening and a retracted position that retreats from the first opening, and a drive source that rotates the blade member around a predetermined position. Including a blade driving device for a camera,
The blade member has an outer edge portion larger than the first opening,
The second opening is formed to have an inner edge that relatively moves while intersecting the outer edge in a hook shape when the blade member rotates from the operating position to the retracted position .
The flat plate member includes a partition plate that is arranged in parallel with the base plate to define a blade chamber that houses the blade member and has the second opening,
The second opening of the partition plate is continuous with both ends of the arcuate inner edge with an arcuate inner edge having a larger radius of curvature than the first opening and a larger radius of curvature than the arcuate inner edge. And a substantially V-shaped inner edge that closes with a taper,
The blade member moves from the substantially V-shaped inner edge side toward the operating position,
The outer edge of the blade member is substantially the same as the arc-shaped inner edge of the second opening of the partition plate on the side facing the substantially V-shaped inner edge in a state where the blade member is in the operating position. A blade driving device for a camera, wherein an arcuate outer edge portion having a radius of curvature is formed . The blade member is an ND filter blade formed only with a flat ND filter from an effective region covering at least the first opening to a region on the free end side.
The camera blade driving device according to claim 1 , wherein The blade member is a shutter blade that opens and closes the first opening, or a diaphragm blade having a third opening that has a smaller aperture than the first opening.
The camera blade driving device according to claim 1 , wherein The main plate has a substantially circular main outer contour portion and a convex outer contour portion that protrudes from the main outer contour portion so as to cover the arc-shaped outer edge portion of the blade member when the blade member is located at the retracted position. Formed to contain,
The camera blade drive device according to any one of claims 1 to 3, wherein

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