JP2015125370A - Focal plane shutter and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce occurrence of static electricity when a blade member slides in a focal plane shutter, and reduce a load exerted on the blade member.SOLUTION: A focal plane shutter comprises: a base plate 10 that includes an opening part for exposure; plate-like blade members 30 and 40 that are movably provided in the base plate to open/close the opening part and are formed of a resin material; and a plate-like adjacent plate (intermediate plate 50 and guide plate 60) that are arranged adjacent to the blade member, and are formed of a resin material, and the blade members include a plurality of blades 31 to 34 and 41 to 44 that open the opening part by being overlapped each other and close the opening part by being developed. The adjacent plate (intermediate plate 50 and guide plate 60) includes a plurality of penetration holes 50e and 50f and 60c in an area where the plurality of blades relatively moves. Accordingly, occurrence of static electricity and the like can be reduced or suppressed, and the blade member is smoothly moved and a desired shutter operation can be obtained.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focal plane shutter and a camera having a blade member that opens and closes an opening for exposure, and in particular, in a camera such as a digital camera, an adjacent plate adjacent to the blade member and the blade member that opens and closes the opening for exposure. The present invention relates to a focal plane shutter in which (partition plate, intermediate plate, guide plate, presser plate) and the like are formed of a resin material, and a camera using the focal plane shutter.

  As a conventional focal plane shutter, a substantially rectangular base plate (substrate) having an opening for exposure and formed of a synthetic resin material, and an intermediate formed of a synthetic resin material and disposed at a predetermined distance from the base plate. A partition plate that is arranged with a predetermined distance from the plate, the intermediate plate and made of a synthetic resin material, a back plate (back plate) that is arranged with a predetermined interval from the divider plate and made of a synthetic resin material, A wing member (front curtain) formed of a synthetic resin material is movably disposed between the partition plate and the back plate to open and close the opening of the base plate, and moves between the intermediate plate and the partition plate to open and close the opening of the base plate. Focal plane equipped with a freely arranged vane member (rear curtain) formed of a synthetic resin material, a drive member (front curtain lever, rear curtain lever) for driving the vane member, and the like Yatta is known (e.g., see Patent Document 1).

However, in this focal plane shutter, the blade members (front curtain, rear curtain) are formed in a thin plate shape with a resin material, and the blade plate is slid adjacently, such as an intermediate plate, a partition plate, and a back plate. Since the adjacent plates are all made of a resin material in a thin plate shape, static electricity is generated when the blade member slides, and when the intermediate plate, partition plate, or back plate is charged, the static electricity causes the blade member to move. Adsorption increases the load when the blade member is activated, and there is a risk that it will be difficult to drive the blade member with a motor with a small driving force. There is also a risk that the movement of the blade member may be hindered by adsorbing.
On the other hand, using a motor that generates a large driving force to overcome static electricity leads to an increase in the size and cost of the device, making it difficult to mount on a digital camera or the like that requires a reduction in size. Adsorption of dust, dust, wear powder, etc. due to the above cannot be eliminated.

JP 2012-27332 A

  The present invention has been made in view of the above circumstances, and the object of the present invention is to simplify the structure, reduce the weight, reduce the cost, save space, and the like without increasing the number of parts. While reducing the generation of static electricity, reducing the load on the blade member, reducing the adsorption of dust, dust, abrasion powder, etc. due to static electricity, and smoothly operating the blade member, the desired shutter operation (exposure operation) It is an object of the present invention to provide a focal plane shutter and a camera capable of performing the above.

The focal plane shutter of the present invention has a ground plate having an opening for exposure, a flat blade member formed of a resin material that is movably provided on the ground plate to open and close the opening, and adjacent to the blade member. A focal plane shutter including a plurality of blades that overlap each other to open and open and close the opening. And the said adjacent board has a some through-hole in the area | region where a some blade | wing moves relatively, It is characterized by the above-mentioned.
According to this configuration, the plurality of blades included in the blade member move along the adjacent plate and expand to reach a closed position where the opening is closed, and move along the adjacent plate and overlap to form the opening. It reaches the open position to open.
Here, although the plurality of blades slide along the adjacent plate, the adjacent plate is provided with a plurality of through holes, so that the area charged by sliding (friction) is reduced and the generation of static electricity is reduced. Therefore, the load that static electricity exerts on the blade member (a plurality of blades) is reduced, the frictional resistance is reduced by reducing the sliding area, and the adsorption of dust, dust, wear powder, etc. due to static electricity is reduced, The blade member moves smoothly and can perform a desired shutter operation (exposure operation).

In the above configuration, the blade member includes a leading blade member and a trailing blade member that open and close the opening, and the leading blade member and the trailing blade member overlap each other to open the opening and deploy to close the opening. The adjacent plate is arranged at a predetermined interval from the base plate, and is divided into a moving region of the leading blade member and a moving region of the trailing blade member and has an opening facing the opening of the ground plate. The intermediate plate can include a plurality of through-holes in a region deviating from the opening and a region where the plurality of blades of the leading blade member and the trailing blade member overlap each other.
According to this structure, the plurality of blades included in the leading blade member move along the intermediate plate and expand to reach a closed position where the opening is closed, and move along the intermediate plate and overlap to open the opening. It reaches the open position to release. The plurality of blades included in the rear blade member move along the intermediate plate and expand to reach a closed position where the opening is closed, and move along the intermediate plate and overlap to open the opening. It reaches the open position.
Here, the plurality of blades of the leading blade member and the trailing blade member slide along the one side surface and the other side surface of the intermediate plate, respectively, but the intermediate plate includes the leading blade member and the trailing blade member. Since a plurality of through holes are provided in a region where a plurality of blades overlap, the charged region due to sliding (friction) is reduced and the generation of static electricity is reduced. Therefore, the leading blade member and the trailing blade member overlap. The load exerted by static electricity when the unfolding operation is performed is reduced, the frictional resistance is reduced by reducing the sliding area, and the adsorption of dust, dust, wear powder, etc. due to static electricity is reduced. The trailing blade member moves smoothly and can perform a desired shutter operation (exposure operation).

In the above configuration, the blade member includes a plurality of arms having connecting portions that connect the plurality of blades, and the intermediate plate has a plurality of through holes in a region deviated from the outermost movement locus in which the connecting portions of the plurality of arms move. A configuration having the following can be adopted.
According to this configuration, since the plurality of through holes are provided in a region deviated from the outermost movement trajectory in which the connecting portion of the arm that connects the plurality of blades moves, the blade member (the plurality of blades and the plurality of arms). ) Moves, the connecting portion can move smoothly without being caught by the inner edge of the through hole.

In the above configuration, the blade member includes a leading blade member and a trailing blade member that open and close the opening, and the leading blade member and the trailing blade member overlap each other to open the opening and deploy to close the opening. And the adjacent plates are free ends of the leading blade member and the trailing blade member to guide the free end sides of the leading blade member of the leading blade member and the free end sides of the plurality of blades of the trailing blade member, respectively. Including two guide plates arranged adjacent to the region on the side, the two guide plates having a plurality of through holes in a region inside the outermost movement locus on the free end side of the plurality of blades. Can be adopted.
According to this configuration, the plurality of blades included in the leading blade member reach the closed position in which the region on the free end side thereof moves and expands along the guide plate to close the opening, and on the free end side thereof The region moves along the guide plate and overlaps to reach an open position where the opening is opened. In addition, the plurality of blades included in the rear blade member have their free end side regions moved along the guide plate and deployed to reach a closed position, and the free end side regions are guides. It moves along the plate and reaches an open position where it overlaps and opens the opening.
Here, the plurality of blades of the leading blade member and the trailing blade member slide along the guide plates arranged corresponding to each of the leading blade member and the trailing blade member. Since a plurality of through-holes are provided in the region inside the outermost movement locus on the free end side, the charged region due to sliding (friction) is reduced and the generation of static electricity is reduced. The load exerted by static electricity when the blade member and the rear blade member slide is reduced, the frictional resistance is reduced by reducing the sliding area, and the adsorption of dust, dust, wear powder, etc. due to static electricity is reduced. The blade member and the rear blade member move smoothly, and a desired shutter operation (exposure operation) can be performed. In particular, since a plurality of through holes are provided in a region inside the outermost movement locus on the free end side of the plurality of blades, when the leading blade member and the trailing blade member move, the free ends of the plurality of blades The edge can move smoothly without being caught by the inner edge of the through hole.

The said structure WHEREIN: The structure by which the metal plating process is given to the adjacent board can be employ | adopted.
According to this configuration, the surface of the adjacent plate (intermediate plate, guide plate) is subjected to metal plating, so that the blade member (front blade member, rear blade member) slides along the adjacent plate. However, charging is suppressed or prevented, and more effective antistatic action can be obtained in cooperation with the plurality of through holes.

The camera of the present invention includes a focal plane shutter having any one of the above-described configurations.
According to this configuration, the generation of static electricity is reduced and the load on the blade member is reduced while achieving the simplification of structure, weight reduction, cost reduction, space saving, etc. without increasing the number of parts. In addition, it is possible to obtain a camera that can reduce the adsorption of dust, dust, wear powder, and the like due to static electricity and can smoothly operate the blade member to perform a desired shutter operation (exposure operation).

  According to the focal plane shutter having the above-described configuration, it is possible to reduce the generation of static electricity while reducing the generation of static electricity while achieving simplification, weight reduction, cost reduction, space saving, etc. without increasing the number of parts. It is possible to reduce the load exerted, reduce the adsorption of dust, dust, abrasion powder, and the like due to static electricity, and smoothly operate the blade member to perform a desired shutter operation (exposure operation).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of a focal plane shutter according to the present invention, in which a leading blade member is deployed to close an opening, and rear blade members overlap to open an opening. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of a focal plane shutter according to the present invention, in which a leading blade member overlaps to open an opening, and a trailing blade member expands to close the opening. It is a top view which shows the adjacent board (intermediate board) contained in the focal plane shutter shown in FIG.1 and FIG.2. FIG. 3 is a plan view showing an adjacent plate (guide plate) included in the focal plane shutter shown in FIGS. 1 and 2. FIG. 3 is a partial sectional view showing an internal structure of the focal plane shutter shown in FIGS. 1 and 2 and showing a base plate, an intermediate plate, a back plate, two guide plates, a leading blade member, and a trailing blade member. FIG. 3 is a plan view showing an arrangement relationship between the outermost movement trajectory of the connecting portion of the arm included in the leading blade member and the trailing blade member and a plurality of through holes provided in the intermediate plate in the focal plane shutter shown in FIGS. 1 and 2. . FIG. 3 is a plan view showing the positional relationship between the outermost movement trajectory on the free end side of the leading blade member and the trailing blade member and a plurality of through holes provided in the guide plate in the focal plane shutter shown in FIGS. 1 and 2. It is a fragmentary sectional view which shows other embodiment of the adjacent board (intermediate board, guide board) contained in the focal plane shutter concerning this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 5, the focal plane shutter according to this embodiment is movable with respect to a substantially rectangular base plate 10, a back plate 20 disposed at a predetermined interval from the base plate 10, and the base plate 10. A leading blade member 30 (four blades 31, 32, 33, 34 and two arms 35, 36) as a supported blade member, and a trailing blade member as a blade member supported movably with respect to the base plate 10 40 (four blades 41, 42, 43, 44 and two arms 45, 46), an intermediate plate 50 as an adjacent plate disposed at a predetermined interval between the base plate 10 and the back plate 20, and a leading blade Two guide plates 60 and 60 as adjacent plates disposed adjacent to the free end regions of the member 30 and the rear blade member 40, a front blade drive lever (not shown) for driving the front blade member 30, and the rear Blade member 40 Rear blade drive lever (not shown) to be driven, set member (not shown) for setting the front blade drive lever and the rear blade drive lever to the set position before the exposure operation, the front blade drive lever and the rear blade set at the set position An electromagnet (not shown) that holds and holds the drive lever is provided.

  The base plate 10 is formed in a substantially rectangular flat plate shape using a resin material. As shown in FIGS. 1, 2, and 5, the exposure opening 10 a, the arc-shaped long hole 10 b, and the long hole 10 c are formed. The supporting shafts 10d and 10e that are erected on the back side and rotatably support the leading blade member 30, the supporting shafts 10f and 10g that rotatably support the rear wing member 40, and the leading blade drive that are erected on the front side. A support shaft (not shown) that supports the lever rotatably, a support shaft (not shown) that is erected on the front side and rotatably supports the rear blade drive lever, and a set member (not shown) that is erected on the front side ) Is supported rotatably (not shown) and the like.

As shown in FIGS. 1, 2, and 5, the back plate 20 is formed in a substantially rectangular flat plate shape using a resin material. The back plate 20 has an opening 20 a formed in a position corresponding to the opening 10 a, and is long. A long hole 20b corresponding to the hole 10b, a long hole 20c corresponding to the long hole 10c, and the like are provided.
The back plate 20 is connected to the base plate 10 (connecting portion thereof) with screws or the like at a predetermined interval on the back side of the base plate 10.

As shown in FIGS. 1 and 2, the leading blade member 30 includes four blades 31, 32, 33, 34, which are formed in an elongated flat plate shape using a resin material such as polyethylene terephthalate (PET), for example. It comprises two arms 35 and 36 that connect 31, 32, 33 and 34.
The arm 35 is rotatably supported by the support shaft 10d and has four connecting portions 35a such as caulks for connecting the four blades 31, 32, 33, and 34, respectively, and a part of the connecting portions 35a. It is connected to the drive pin of the blade drive lever.
The arm 36 is rotatably supported by the support shaft 10e and has four connecting portions 36a such as caulks that connect the four blades 31, 32, 33, and 34 respectively.
Then, as shown in FIG. 1, when the arm 35 is driven upward (counterclockwise) by the leading blade driving lever, the four blade bodies 31, 32, 33, 34 are developed. On the other hand, as shown in FIG. 2, the four blade bodies 31, 32, 33, and 34 are overlapped by being driven downward (clockwise) by the leading blade driving lever as shown in FIG. Thus, the opening 10a is opened.

As shown in FIGS. 1 and 2, the rear blade member 40 includes four blades 41, 42, 43, 44, which are formed into an elongated flat plate shape using a resin material such as polyethylene terephthalate (PET), for example. It comprises two arms 45 and 46 that connect 41, 42, 43 and 44.
The arm 45 is rotatably supported by the support shaft 10f and has four connecting portions 45a such as caulks for connecting the four blades 41, 42, 43, and 44, respectively, and a part of them is a rear part. It is connected to the drive pin of the blade drive lever.
The arm 46 is rotatably supported by the support shaft 10g and has four connecting portions 46a such as caulkings that connect the four blades 41, 42, 43, and 44, respectively.
Then, as shown in FIG. 1, the arm 45 is driven upward (counterclockwise) by the rear blade drive lever, so that the four blade bodies 41, 42, 43, 44 are overlapped and opened. On the other hand, as shown in FIG. 2, the four blade bodies 41, 42, 43, and 44 are unfolded by being driven downward (clockwise) by the rear blade drive lever as shown in FIG. Thus, the opening 10a is closed.

  As shown in FIGS. 1 to 3, 5, and 6, the intermediate plate 50 is formed into a substantially rectangular flat plate shape using a resin material such as polyethylene terephthalate (PET), for example. An opening 50a formed at a position corresponding to the opening 10a, three attachment holes 50b for attachment to the main plate 10, relief portions 50c and 50d for escaping the leading blade driving lever and the trailing blade driving lever, and the leading blade member 30 A plurality of through holes 50e formed in a region where the four blades 31, 32, 33, 34) overlap, and a rear blade member 40 (of the four blades 41, 42, 43, 44) formed in a region where they overlap. A plurality of through holes 50f and the like are provided.

As shown in FIG. 5, the intermediate plate 50 is disposed between the base plate 10 and the back plate 20 so as to define two blade chambers, that is, a moving region (blade chamber) of the leading blade member 30. The front blade member 30 is slid along the surface on one side, and the rear blade member 40 is slid along the surface on the other side, while being divided into the movement region (blade chamber) of the rear blade member 40. Is formed.
Here, as shown in FIG. 6, the plurality of through holes 50 e are regions where the leading blade member 30 (the plurality of blades 31, 32, 33, 34) overlaps below the opening 50 a and the four arms 35, The connecting portions 35a, 36a, 45a, and 46a of 36, 45, and 46 are formed in regions that are out of the outermost movement trajectories R1 and R1 in which they move.
Further, as shown in FIG. 6, the plurality of through holes 50 f are regions where the rear blade member 40 (the plurality of blades 41, 42, 43, 44) overlaps above the opening 50 a and the four arms 35, 36. , 45, 46 are formed in areas deviated from the outermost movement trajectories R1, R1 in which the connecting portions 35a, 36a, 45a, 46a move.
The plurality of through holes 50e and 50f are formed as circular holes, but are not limited to this shape, and for example, elliptical holes, long holes, and other shapes can be adopted.

Thus, since the plurality of through holes 50e, 50f are provided in the region where the plurality of blades 31, 32, 33, 34, 41, 42, 43, 44 of the leading blade member 30 and the trailing blade member 40 overlap, The area (area) to be charged due to sliding (friction) is reduced and the generation of static electricity is reduced. Therefore, the load exerted by static electricity when the leading blade member 30 and the trailing blade member 40 are deployed from the overlapping state. The frictional resistance is reduced by reducing the sliding area, the adsorption of dust, dust, abrasion powder, etc. due to static electricity is reduced, and the leading blade member 30 and the trailing blade member 40 move smoothly, The shutter operation (exposure operation) can be performed.
Further, a plurality of through holes 50e, 50f are formed in regions deviating from the outermost movement trajectories R1, R1 along which the connecting portions 35a, 36a, 45a, 46a of the four arms 35, 36, 45, 46 move. Therefore, when the leading blade member 30 and the trailing blade member 40 (eight blades 31, 32, 33, 34, 41, 42, 43, 44 and the four arms 35, 36, 45, 46) move. The connecting portions 35a, 36a, 45a, 46a can move smoothly without being caught by the inner edges of the through holes 50e, 50f.

As shown in FIGS. 1, 2, 4, 5, and 7, the two guide plates 60, 60 are made of, for example, a resin material such as polyethylene terephthalate (PET) and have a substantially L-shaped flat plate shape. Are formed so as to escape the opening 10a of the main plate 10, three attachment holes 60b for attaching to the main plate 10 and the back plate 20, respectively, and the four blades of the leading blade member 30 31, 32, 33, 34) on the free end side outermost movement locus R 2 and the rear blade member 40 (the four blades 41, 42, 43, 44) on the free end side outermost movement locus R 2 A plurality of through-holes 60c formed in the region are provided.
As shown in FIG. 5, one guide 60 is disposed adjacent to the inner side of the back plate 20 and adjacent to the free end side of the leading blade member 30, and the four blades 31 of the leading blade member 30. , 32, 33 and 34 are guided along the free ends.
Further, as shown in FIG. 5, the other guide plate 60 is disposed so as to be adjacent to the inside of the base plate 10 and adjacent to the region on the free end side of the rear blade member 40. The free ends of the blades 41, 42, 43, and 44 are guided.

As described above, the two guide plates 60, 60 have the outermost movements on the free end side of the plurality of blades 31, 32, 33, 34, 41, 42, 43, 44 of the leading blade member 30 and the trailing blade member 40. Since the plurality of through holes 60c are provided in the region inside the trajectories R2 and R2, the region charged by sliding (friction) is reduced, the generation of static electricity is reduced, and therefore the leading blade member 30 and The load exerted by static electricity when the rear blade member 40 slides is reduced, the frictional resistance is reduced by reducing the sliding area, and the adsorption of dust, dust, wear powder, etc. due to static electricity is reduced, and the front blade member 30 and the rear blade member 40 can move smoothly to perform a desired shutter operation (exposure operation).
In particular, since the plurality of through holes 60c are provided in the regions inside the outermost movement trajectories R2 and R2 on the free end side of the plurality of blades 31, 32, 33, 34, 41, 42, 43, and 44, When the leading blade member 30 and the trailing blade member 40 move, the free edge portions of the plurality of blades 31, 32, 33, 34, 41, 42, 43, 44 are not caught on the inner edge of the through hole 60c. It can move smoothly.

Next, the opening / closing operation of the leading blade member 30 and the trailing blade member 40 in this focal plane shutter will be briefly described with reference to FIGS. 1 and 2. First, a pause after completion of the exposure operation (after completion of the shutter operation). In the state, as shown in FIG. 2, the leading blade member 30 is located at a position where the four blades 41, 42, 43, 44 overlap to open the opening 10 a, and the trailing blade member 40 is The four blades 41, 42, 43, 44 are located at positions where the opening 10a is closed by unfolding.
Here, when a preparation command for the shutter operation (setting operation) is issued, the leading blade driving lever and the trailing blade driving lever rotate in one direction by the activation of the setting member, and as shown in FIG. (Four blades 31, 32, 33, 34) move upward and expand to close the opening 10a, and the rear blade member 40 (four blades 41, 42, 43, 44) moves upward. It moves toward and overlaps to open the opening 10a.

Then, based on the release signal or the like, when the leading blade driving lever and the trailing blade driving lever are attracted and held by the electromagnet and the set member returns to the rest position, the attracting of each electromagnet is released at a desired timing. The leading blade drive lever rotates in the other direction, and after a predetermined period, the trailing blade drive lever rotates in the other direction. As shown in FIG. 2, the leading blade member 30 (four blades 31, 32, 33, 34) ) Move from above to below and overlap to open the opening 10a, and the rear blade member 40 (four blades 41, 42, 43, 44) moves from above to below and expands to open. The part 10a is closed.
Thereby, the exposure operation (shutter operation) by the leading blade member 30 and the trailing blade member 40 is completed.

  In this movement process, the leading blade member 30 and the trailing blade member 40 slide and reciprocate along the intermediate plate 50 and the guide plates 60, 60, but the intermediate plate 50 includes the leading blade member 30 and the rear blade member 30. Since a plurality of through holes 50e and 50f are provided in a region where the plurality of blades 31, 32, 33, 34, 41, 42, 43, and 44 of the blade member 40 overlap, a region charged by sliding (friction) is provided. This reduces the generation of static electricity, and therefore reduces the load exerted by static electricity when performing the deployment operation from the state where the leading blade member 30 and the trailing blade member 40 overlap, and the frictional resistance is reduced by reducing the sliding area. In addition, the adsorption of dust, dust, wear powder, and the like due to static electricity is reduced, and the leading blade member 30 and the trailing blade member 40 move smoothly to perform a desired shutter operation (exposure operation). Kill.

  Further, the guide plates 60, 60 are provided with outermost movement trajectories R2, R2 on the free end side of the plurality of blades 31, 32, 33, 34, 41, 42, 43, 44 of the leading blade member 30 and the trailing blade member 40. Since the plurality of through holes 60c are provided in the inner region, the region charged by sliding (friction) is reduced, and the generation of static electricity is reduced. Therefore, the leading blade member 30 and the trailing blade member 40 are reduced. The load exerted by static electricity when sliding is reduced, the frictional resistance is reduced by reducing the sliding area, the adsorption of dust, dust, wear powder, etc. due to static electricity is reduced, and the leading blade member 30 and the trailing blade The member 40 can move smoothly and perform a desired shutter operation (exposure operation). In particular, since the plurality of through holes 60c are provided in the regions inside the outermost movement trajectories R2 and R2 on the free end side of the plurality of blades 31, 32, 33, 34, 41, 42, 43, and 44, When the leading blade member 30 and the trailing blade member 40 move, the free edge portions of the plurality of blades 31, 32, 33, 34, 41, 42, 43, 44 are not caught on the inner edge of the through hole 60c. It can move smoothly.

  According to the focal plane shutter having the above-described configuration, it is possible to reduce the generation of static electricity while reducing the generation of static electricity while achieving simplification, weight reduction, cost reduction, space saving, and the like without increasing the number of parts. The load on the leading blade member 30 and the trailing blade member 40) is reduced, and adsorption of dust, dust, abrasion powder, and the like due to static electricity is reduced, and the blade member (the leading blade member 30 and the trailing blade member 40) is made smooth. It can be operated to perform a desired shutter operation (exposure operation).

FIG. 8 shows another embodiment of the focal plane shutter according to the present invention, and is a partial cross-sectional view showing a state in which the surfaces of the intermediate plate 50 and the guide plate 60 are subjected to metal plating. is there.
In this embodiment, the intermediate plate 50 ′ and the guide plate 60 ′ are subjected to metal plating 50 m and 60 m over the entire surface of the intermediate plate 50 and the guide plate 60 described above.
As the metal plating, electrolytic Ni plating, electroless Ni plating, or the like can be employed.
According to this, the surface of the intermediate plate 50 ′ and the guide plate 60 ′ is subjected to the metal plating 50m, 60m, so that the blade member (the leading blade member 30, the rear blade member 40) is replaced with the intermediate plate 50 ′. In addition, even when sliding along the guide plate 60 ', charging is suppressed or prevented, and a more effective antistatic action is obtained in cooperation with the plurality of through holes 50e, 50f, 60c.

In the said embodiment, although the case where the present invention was employ | adopted in the structure provided with the leading blade member 30 and the trailing blade member 40 as a blade | wing member, ie, two blade members were shown, it is limited to this. For example, the present invention may be employed in a configuration in which one shutter member is provided and the shutter operation is performed simply by moving the opening from the open state to the closed state.
In the above-described embodiment, the case where the present invention is adopted in the configuration including the intermediate plate 50 and the guide plate 60 as the adjacent plates is not limited to this, and only the intermediate plate 50 is provided. The present invention may be employed in a configuration, a configuration including only the guide plate 60, or a configuration including a partition plate having another form as an adjacent plate.

  As described above, the focal plane shutter according to the present invention reduces the generation of static electricity while achieving the simplification of structure, weight reduction, cost reduction, space saving, etc. without causing an increase in parts. Since the load on the blade member is reduced, the adsorption of dust, dust, wear powder, etc. due to static electricity is reduced, and the blade member can be operated smoothly to perform the desired shutter operation (exposure operation). The present invention is useful not only for small cameras such as cameras, but also for other optical devices having an opening for exposure.

DESCRIPTION OF SYMBOLS 10 Base plate 10a Opening part 20 Back plate 30 Lead blade member (blade member)
31, 32, 33, 34 Blade 35, 36 Arm 35a, 36a Connecting portion 40 Rear blade member (blade member)
41, 42, 43, 44 Blade 45, 46 Arm 45a, 46a Connecting portion 50, 50 'Intermediate plate (adjacent plate)
50a Openings 50e, 50f Multiple through holes 50m Metal plating 60, 60 'Guide plate (adjacent plate)
60c Multiple through holes 60m Metal plating R1, R2 Outermost movement trajectory

Claims (6)

A ground plate having an opening for exposure, a flat blade member formed by a resin material and movably provided on the ground plate to open and close the opening, and disposed adjacent to the blade member A focal plane shutter comprising a plurality of blades, each including a flat adjacent plate formed of a resin material, wherein the blade member overlaps each other to open and open the opening and close the opening. ,
The adjacent plate has a plurality of through holes in a region where the plurality of blades relatively move.
A focal plane shutter characterized by that. The blade member includes a front blade member and a rear blade member that open and close the opening,
The leading blade member and the trailing blade member each include a plurality of blades that overlap each other to open and open the opening and close the opening.
The adjacent plate is an intermediate plate that is disposed at a predetermined interval from the base plate and partitions the moving region of the leading blade member and the moving region of the trailing blade member and has an opening facing the opening of the ground plate. Including
The intermediate plate has the plurality of through holes in a region deviating from the opening and a region where the plurality of blades of the leading blade member and the trailing blade member overlap each other.
The focal plane shutter according to claim 1. The blade member includes a plurality of arms having a connecting portion that connects the plurality of blades,
The intermediate plate has the plurality of through holes in a region deviated from an outermost movement trajectory in which the connecting portions of the plurality of arms move.
The focal plane shutter according to claim 1 or 2, The blade member includes a front blade member and a rear blade member that open and close the opening,
The leading blade member and the trailing blade member each include a plurality of blades that overlap each other to open and open the opening and close the opening.
The adjacent plate is a region on the free end side of the leading blade member and the trailing blade member so as to guide the free end side of the plurality of blades of the leading blade member and the free end side of the plurality of blades of the trailing blade member, respectively. Including two guide plates arranged adjacent to
The two guide plates have the plurality of through holes in a region inside the outermost movement locus on the free end side of the plurality of blades,
The focal plane shutter according to any one of claims 1 to 3. The adjacent plate is subjected to metal plating treatment on the surface,
The focal plane shutter according to claim 1, wherein the focal plane shutter is a shutter. The focal plane shutter according to any one of claims 1 to 5 is provided.
A camera characterized by that.

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