JP2014048660A - Camera focal plane shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera focal plane shutter that does not damage a surface of a shutter blade nor affect an operation velocity even if the operation is repeatedly performed.SOLUTION: In a focal plane shutter constituting two blade chambers composed of a shutter base plate 1, a cover plate 2 and an intermediate plate 3 and including a front blade and a rear blade, rollers 19 and 20 are attached on a blade chamber side composed of the shutter base plate 1 and the cover plate 2. The rollers 19 and 20 come into contact with tip parts of blade members of the front blade and the rear blade are caused to be rotated upon operating a shutter blade, thereby blade members of the front blade and the rear blade are operated without receiving friction from the shutter base plate 1 and the cover plate 2, and it becomes possible to speed up the shutter blade.

Description

  The present invention relates to a focal plane shutter for a camera having one or two shutter blades.

  In the focal plane shutter for a camera, two blade chambers are formed between three plate members called a shutter base plate, an intermediate plate, and a cover plate. Two shutter blades, each of which is referred to as `` I '', and one shutter blade is arranged in the blade chamber formed between the shutter base plate and the cover plate. It has been.

  In any focal plane shutter, the configuration of the shutter blades is substantially the same, a plurality of arms having one end in the length direction rotatably attached to the shutter base plate, and a blade member pivotally supported by these arms. It consists of

  Since the blade member is generally made of a thin material, it may be displaced or deformed in the optical axis direction. However, if such displacement / deformation occurs, the blade member comes into contact with another plate member. When the shutter blade is operated in a state where the blade member of the shutter blade is in contact with the plate member, there is a problem that the operating speed of the shutter blade changes.

  Conventionally, the blade member is formed on the plate member by supporting the blade member by forming a rail-like thick portion along the operation locus of the shutter blade with respect to the plate member. I have tried not to touch it. However, if the rail-like thick part is provided in this manner so as to support only a specific part of the blade member, the part in contact with the thick part on the rail may be concentrated and worn out.

  In order to solve such a problem, Patent Document 1 discloses a rail-like thick portion (“suppression strip” in Patent Document 1) provided on a shutter base plate, and shutter blades (“Blade” in Patent Document 1). It is formed in a shape that does not follow the operation trajectory of the “group”). Thereby, since the place which slide-contacts with the rail-shaped thick part in the blade | wing member of a shutter blade | wing can be disperse | distributed, there exists an effect that it becomes difficult to damage a blade | wing member.

JP 2001-83571 A

  As described in Patent Document 1, when the rail-like thick portion is formed in a shape that does not follow the operation trajectory of the shutter blade, the operation of the shutter blade is stable and the blade member is not easily damaged. However, the blade member receives friction due to sliding contact with the rail-like thick portion.

  The present invention has been made to solve such a problem, and the object of the present invention is to prevent the blade member of the shutter blade from being in contact with the plate member and damaging it, and to increase the operating speed of the shutter blade. It is an object of the present invention to provide a focal plane shutter for a camera that can be further increased in speed.

  In order to achieve the above object, a focal plane shutter for a camera according to the present invention has a shutter base plate made of a synthetic resin having an opening for a subject optical path, and an opening for a subject optical path. A cover plate that is attached and forms a blade chamber between the shutter base plate, a plurality of arms, and a blade member pivotally supported by the arms, and is disposed on the shutter base plate in the blade chamber. At least one shutter blade that is rotatably attached to one end of each arm with respect to a plurality of blade mounting shafts that are erected, and the blade of the shutter base plate or the cover plate A rotating member that rotates in contact with the blade member of the shutter blade when the shutter blade operates is attached to the chamber side surface.

  Further, when the rotating member is a roller attached so as to rotate along the traveling direction of the blade member of the shutter blade, the rotating member can be easily attached to the shutter base plate, and the shutter blade Operation is smooth.

  Further, if the rotating member is a sphere that is rotatably mounted, the operation of the shutter blades becomes smooth.

  In the focal plane shutter for a camera according to the present invention, since the rotating member is attached to the surface of the shutter base plate on the blade chamber side so as to be in contact with the blade member of the shutter blade, the shutter blade rotates when the shutter blade operates. By rotating the member, the blade member of the shutter blade can operate without receiving friction from the shutter base plate, and the surface of the shutter blade is not damaged by sliding contact with the shutter base plate, and the operating speed of the shutter blade can be increased. The effect which becomes.

FIG. 2 is a plan view of the focal plane shutter for a camera according to the first embodiment when viewed from the subject side, that is, the photographing lens side, and shows a state immediately after the exposure operation of the rear blade group is completed. FIG. 3 is a plan view of the focal plane shutter for a camera according to the first embodiment when viewed from the imaging element side with the intermediate plate and the cover plate removed, and shows a state immediately after the exposure operation of the rear blade group is completed. In the focal plane shutter for cameras of Example 1, it is the perspective view and sectional drawing which show the roller attached to the shutter base plate. FIG. 3 is a plan view in which shutter blades are set from the state of FIG. 2. It is a top view which shows the state which is operating the front blade group and the rear blade group from the state of FIG. FIG. 3 is a cross-sectional view taken along line A-A ′ showing contact between a shutter blade and a roller in the state of FIG. 2. FIG. 5 is a cross-sectional view taken along line A-A ′ showing contact between the shutter blade and the roller in the state of FIG. 4. FIG. 6 is a cross-sectional view taken along line A-A ′ showing contact between the shutter blade and the roller in the state of FIG. 5. In the focal plane shutter for cameras of Example 1, it is the perspective view and sectional drawing which show the spherical body attached to the shutter base plate.

  The embodiment of the present invention will be described with reference to two illustrated examples. 1 to 8 are for explaining the first embodiment, and FIG. 9 is for explaining the second embodiment.

  First, Example 1 will be described with reference to FIGS. FIG. 1 is a plan view of the shutter blade exposure operation end state viewed from the subject side, that is, from the photographing lens side. FIG. 2 is a plan view of the shutter blade exposure operation end state viewed from the image sensor side with the intermediate plate and cover plate removed. FIGS. 3A and 3B are diagrams showing how to attach a roller that is a rotating member in the first embodiment, where FIG. 3A is a perspective view and FIG. 3B is a cross-sectional view. FIG. 4 is a plan view of the shutter blades set in the same manner as in FIG. FIG. 5 is a plan view of the shutter blade during an exposure operation as seen in the same manner as FIG. 6 to 8 are cross-sectional views taken along the line A-A 'showing the contact state between the shutter blades and the rollers in the states of FIGS.

  First, the configuration of the first embodiment will be described. In the focal plane shutter for a camera according to the present embodiment, an intermediate plate 3 is disposed between the shutter base plate 1 and the cover plate 2, and a blade chamber in which a leading blade is disposed between the shutter base plate 1 and the intermediate plate 3 is provided. The blade chambers in which the rear blades are arranged between the cover plate 2 and the intermediate plate 3 are respectively configured. The cover plate 2 and the intermediate plate 3 are attached to the shutter base plate 1 by appropriate means and have substantially the same shape as the shutter base plate 1. FIG. 1 is a diagram showing a surface of the shutter base plate 1 opposite to the blade chamber, and FIGS. 2, 4 and 5 are diagrams showing a surface of the shutter base plate 1 on the blade chamber side. 2, 4 and 5, only the shutter base plate 1 is shown, and the cover plate 2 and the intermediate plate 3 are not shown. The shutter base plate 1 of the present embodiment is made of synthetic resin, and has a rectangular opening 1a centered on the optical axis at the center thereof. The cover plate 2 and the intermediate plate 3 are also made of synthetic resin, and an opening having substantially the same shape as the shutter base plate 1 is formed at the center thereof. A rectangular exposure opening is formed by overlapping the openings of the shutter base plate 1, the cover plate 2, and the intermediate plate 3. Further, the shutter base plate 1 and the cover plate 2 of this embodiment are formed thicker than the intermediate plate 3 because it is necessary to handle rollers 19 and 20 described later.

  As shown in FIG. 1, the shutter base plate 1 is formed with two arc-shaped elongated holes 1b and 1c, and a well-known buffer having a C-shaped planar shape at the lower end thereof. Members 4 and 5 are attached. Further, shafts 1d, 1e, and 1f are erected on the surface of the shutter base plate 1 opposite to the blade chamber side, and shafts 1g, 1h, 1i, and 1j are erected on the surface of the blade chamber side. Has been. Of these shafts, the shaft 1d and the shaft 1g, and the shaft 1e and the shaft 1j are formed concentrically on the blade chamber side of the shutter base plate 1 and on the opposite side thereof. Further, an attachment portion 1k for attaching the roller 19 is formed on the surface of the shutter base plate 1 on the blade chamber side as will be described later. The cover plate 2 and the intermediate plate 3 are also provided with long holes of the same shape at positions corresponding to the two long holes 1b and 1c of the shutter base plate 1, respectively. Moreover, the attachment part 2a for attaching the roller 20 is formed in the surface at the side of the blade chamber of the cover board 2 so that it may mention later.

  Next, the member attached to the surface on the opposite side to the blade chamber side of the shutter base plate 1 will be described. A rear blade drive member 6 is rotatably attached to a shaft 1d erected on the surface opposite to the blade chamber side of the shutter base plate 1. Further, a leading blade driving member 7 is rotatably attached to a shaft 1e provided upright on a surface opposite to the blade chamber side of the shutter base plate 1. Further, a set member 8 is rotatably attached to a shaft 1f provided upright on the surface of the shutter base plate 1 opposite to the blade chamber side. The rear blade drive member 6 and the front blade drive member 7 have drive pins 6a and 7a, respectively. The drive pins 6a and 7a pass through the long holes 1b and 1c, respectively. It is inserted into a long hole not shown. However, since these configurations are known, the illustration of the rear blade drive member 6, the front blade drive member 7, and the set member 8 is omitted in FIGS. 2, 4 and 5, and only the drive pins 6a and 7a are illustrated. Show.

  Next, the member attached to the surface of the shutter base plate 1 on the blade chamber side will be described with reference to FIG. A front blade and a rear blade as shutter blades are attached to the surface of the shutter base plate 1 on the blade chamber side. The leading blade is composed of two arms 14 and 15 and three blade members 16, 17, and 18 that are pivotally supported in order in the length direction thereof, and the blade that is pivotally supported at the forefront. Reference numeral 18 denotes a slit forming blade. The two arms 14 and 15 are rotatably attached to shafts 1i and 1j provided upright on the blade chamber side surface of the shutter base plate 1, respectively. Further, the arm 15 is formed with a hole 15a, and the driving pin 7a of the leading blade driving member 7 is fitted therein. In addition, although the connection axis | shaft which is a rivet part is used for each pivot structure of such two arms 14 and 15 and the three blade members 16, 17, and 18, since the structure is well-known, Description is omitted.

  The rear blade is composed of two arms 9 and 10 and three blade members 11, 12, and 13 that are pivotally supported in order in the length direction thereof. Reference numeral 13 denotes a slit forming blade. The two arms 9 and 10 are rotatably attached to shafts 1g and 1h that are erected on the surface of the shutter base plate 1 on the blade chamber side, respectively. Further, the arm 9 is formed with a hole 9a, and the driving pin 6a of the trailing blade driving member 6 is fitted therein. As with the leading blade, a connecting shaft, which is a rivet component, is used for each pivotal structure of the two arms 9 and 10 of the trailing blade and the three blade members 11, 12, and 13. Since it is publicly known, the description is omitted.

  Next, the rollers 19 and 20 attached to the shutter base plate 1 and the cover plate 2 will be described with reference to FIG. 3A is a perspective view showing a state in which the roller 19 is attached to the attachment portion 1k of the shutter base plate 1. FIG. 3B is a view in which the roller 19 is attached to the attachment portion 1k of the shutter base plate 1. FIG. It is sectional drawing which showed a mode that it is. A roller 19 is rotatably attached to an attachment portion 1k formed on the blade chamber side surface of the shutter base plate 1 so as to be in contact with the tip portion of the blade member of the leading blade. The roller 19 includes a cylindrical body portion 19a and a shaft portion 19b. The shaft portion 19b protrudes from the surface of the shutter base plate 1 so that the shaft portion 19b is attached to the mounting portion 1k of the shutter base plate 1. It is attached. As will be described later, the roller 19 is rotated in contact with the three blade members 16, 17 and 18 when the leading blade operates. The attachment portion 1k for attaching the roller 19 is formed at a position where the body portion 19a of the roller 19 comes into contact with the tip end portion of the blade member 18 when the leading blade is overlapped and retracts to the lower side of the exposure opening. Yes. The mounting portion 1k is formed so that the rotation direction of the roller 19 substantially coincides with the operation direction of the blade members 16, 17, 18 of the leading blade. Therefore, the roller 19 rotates along the traveling direction of the blade members 16, 17, 18 of the leading blade when the leading blade operates.

  A roller 20 is attached to the attachment portion 2a formed on the blade chamber side surface of the cover plate 2 so as to be in contact with the tip of the blade member of the rear blade. Since it is the same as the case of, the description is omitted. The mounting portion 2a for attaching the shaft portion 20b of the roller 20 is formed at a position where the body portion 20a of the roller 20 comes into contact with the tip end portion of the blade member 13 when the rear blade overlaps and retracts to the upper side of the exposure opening. Has been. Further, like the attachment portion 1k, the attachment portion 2a is formed so that the rotation direction of the roller 20 substantially coincides with the operation direction of the blade members 11, 12, 13 of the rear blade. Therefore, the roller 20 rotates along the traveling direction of the blade members 11, 12, 13 of the rear blade when the rear blade operates. The roller of the present embodiment is made of synthetic resin, and the trunk portion and the shaft portion are formed by integral molding. However, the shaft portion and the trunk portion are separately manufactured, and the shaft portion is formed with respect to the trunk portion. You may make it attach. Moreover, when the trunk | drum which contacts a blade member is made from metal, the antistatic effect is acquired and it becomes much more suitable. The shaft portion may be made of metal and molded so as to be integrated with the body portion of the synthetic resin.

  Next, the exposure operation of the shutter blade will be described with reference to FIGS. FIG. 2 shows a state immediately after the exposure operation is completed. At this time, the three blade members 16, 17, and 18 of the front blade are superimposed and stored below the exposure opening, and the three blade members 11, 12, and 13 of the rear blade are deployed. Covers the exposure aperture. The blade member 18 of the leading blade is in contact with the trunk portion 19 a of the roller 19, and the blade member 11 of the trailing blade is in contact with the trunk portion 20 a of the roller 20. From this state, when the setting member 8 shown in FIG. 1 is rotated for setting operation, the leading blade driving member 7 shown in FIG. It is rotated against the urging force. Therefore, the leading blade arm 14 is rotated by the drive pin 7a fitted in the hole 14a. Accordingly, the three blade members 16, 17, and 18 of the leading blade are operated upward while reducing the amount of overlap between them.

  Thereafter, when the amount of overlap between the blade member 18 of the leading blade and the blade member 13 of the trailing blade reaches a predetermined amount, the trailing blade drive member 6 shown in FIG. It is rotated against the biasing force of the drive spring. Therefore, the arm 9 of the rear blade is rotated by the drive pin 6a fitted in the hole 9a. Accordingly, the three blade members 11, 12, and 13 of the rear blade are operated upward while increasing the overlapping amount.

  In this way, the set operation is performed, and the three blade members 16, 17 and 18 of the leading blade are in a developed state to completely cover the exposure opening, and the three blade members 11 and 12 of the rear blade. , 13 are superposed and stored above the exposure opening, the set member 8 stops rotating, the rotation of each of the drive members stops, and the setting operation ends. In this way, the leading blade and the trailing blade are set. This state is shown in FIG.

  In such a set state, when the release button of the camera is pressed, after the set member 8 returns to the initial position, the leading blade driving member 7 is first rotated by the biasing force of the leading blade driving spring (not shown). The drive pin 7a rotates the leading blade arm 15 to cause the leading blade to perform an exposure operation. Therefore, the three blade members 16, 17, and 18 of the leading blade open the exposure opening by the slit forming edge of the blade member 18 while increasing the mutual overlap amount. After a predetermined time has elapsed, the trailing blade driving member 6 is rotated by a biasing force of a trailing blade driving spring (not shown), and the driving pin 6a rotates the trailing blade arm 9 to cause the trailing blade. To perform the exposure operation. Therefore, the three blade members 11, 12, and 13 of the rear blade cover the exposure opening by the slit forming edge of the blade member 13 while reducing the overlapping amount. FIG. 5 shows a state in which the exposure operation is performed by the slit formed by the slit forming edge of the leading blade member 18 and the slit forming edge of the trailing blade member 13 in this manner.

  Thereafter, the leading blade stops when the driving pin 7a of the leading blade driving member 7 contacts the buffer member 5, and the trailing blade of the leading blade contacts the buffer member 4 with the driving pin 6a of the trailing blade drive member 6. Stop at. In this way, the state where the exposure operation is completed is the state shown in FIG. In the above description of the exposure operation, the case where the exposure operation is performed by forming a slit with the front blade and the rear blade has been described. However, the operation of the rear blade is started after the operation of the front blade is completed. Then, the exposure operation may be performed.

  Such an exposure operation is performed by rotating the leading blade driving member 7 and the trailing blade driving member 6 by a powerful biasing force of a leading blade driving spring and a trailing blade driving spring (not shown). Therefore, the blade members 16, 17, 18 of the front blade and the blade members 11, 12, 13 of the rear blade are bent during the operation, and are deformed in the optical axis direction. When such deformation has occurred, conventionally, the operating speed of the shutter blades has changed as a result of sliding contact with the shutter base plate 1 and the cover plate 2 as described above. However, in the present embodiment, even if it is deformed in the optical axis direction, the rollers 19 and 20 that are in contact with the tip portions of the blade members rotate, so that each blade member becomes the shutter base plate 1 and the cover plate 2. Therefore, the operation speed of the shutter blades can be improved. This will be described with reference to FIGS.

  FIG. 6 shows an exposure operation end state, and is a cross-sectional view taken along line A-A ′ in FIG. 4. In this state, the leading blade is superimposed and stored below the exposure opening, and the trailing blade is deployed to cover the exposure opening. The leading end of the blade member 18 of the leading blade is in contact with the trunk portion 19 a of the roller 19, and the leading end of the blade member 11 of the trailing blade is in contact with the trunk portion 20 a of the roller 20.

  Then, when the set member rotates for the set operation as described above, the leading blade and the trailing blade are operated upward accordingly. At this time, as the leading blade is actuated upward, the leading blade member 16, 17, 18 is moved upward while rotating the roller 19 with the blade member 18 in contact with the body 19a of the roller 19. It will be operated to. When the blade member 18 moves away from the body portion 19 a of the roller 19, the blade member 17 comes into contact with the body portion 19 a of the roller 19 and is operated upward while rotating the roller 19. When the blade member 17 moves away from the body portion 19 a of the roller 19, the blade member 16 comes into contact with the body portion 19 a of the roller 19 and is operated upward while rotating the roller 19.

  Similarly, as the rear blades are operated upward, the blade members 11, 12, and 13 of the rear blades rotate the roller 20 in a state where the blade member 11 is first in contact with the body 20 a of the roller 20. It is operated upwards. When the blade member 12 comes into contact with the body portion 20 a of the roller 20, the blade member 12 is operated upward while rotating the roller 20. When the blade member 13 comes into contact with the body portion 20 a of the roller 20, the blade member 13 is operated upward while rotating the roller 20.

  FIG. 7 shows a cross-sectional view of the state where the setting operation is completed in this way. From this state, when the leading blade driving member 7 is rotated by the biasing force of the leading blade driving spring (not shown) as described above, the leading blade is actuated downward accordingly. At this time, the blade members 16, 17, and 18 of the leading blade are operated downward while rotating the roller 19 in a state where the blade member 16 is in contact with the body portion 19 a of the roller 19. When the blade member 17 comes into contact with the body portion 19 a of the roller 19, the blade member 17 is operated downward while rotating the roller 19. When the blade member 18 comes into contact with the body portion 19 a of the roller 19, the blade member 18 is operated downward while rotating the roller 19.

  Then, after the predetermined time has elapsed, when the trailing blade driving member 6 is rotated by a biasing force of a trailing blade driving spring (not shown), the trailing blade is operated downward. At this time, the blade members 11, 12, and 13 of the rear blade are operated downward while rotating the roller 20 in a state where the blade member 13 is in contact with the body portion 20 a of the roller 20. When the blade member 13 moves away from the trunk portion 20a of the roller 20, the blade member 12 comes into contact with the trunk portion 20a of the roller 20, and is operated downward while rotating the roller 20. And if the blade member 12 leaves | separates from the trunk | drum 20a of the roller 20, the blade member 11 will contact the trunk | drum 20a of the roller 20, and will be act | operated below, rotating the roller 20. FIG. FIG. 8 shows a cross-sectional view of the state during the exposure operation in this way.

  Thus, when the leading blades and the trailing blades are operated, the rollers 19 and 20 that are in contact with the tip portions of the respective blade members rotate, so that the shutter blades 1 and the cover plate 2 are brought into sliding contact with each other. The operating speed will not change. Therefore, even if the number of operations is repeated, the blade member of the shutter blade is not damaged, and further, the operation speed of the shutter blade can be improved. In addition, the rollers 19 and 20 are mounted so that the body portions 19a and 20a protrude from the surfaces of the shutter base plate 1 and the cover plate 2, so that the tip portions of the blade members are in contact with the body portions 19a and 20a. When there is, the portion other than the tip of the blade member does not come into contact with the shutter base plate 1 and the cover plate 2.

  In this embodiment, the roller 19 is attached at a position where the leading blade overlaps with the blade member 18 when the leading blade is stored under the exposure opening, and the roller 20 has a trailing blade. It is attached at a position where it comes into contact with the blade member 13 when being superimposed and stored above the exposure opening. The reason why the rollers are attached at such positions is that if the rollers are attached at the positions where the blade members overlap, the rollers can be sequentially brought into contact with all the blade members when the shutter blades are operated. This is because the surface of the blade member can be well protected. However, the roller of the present embodiment is not limited to the mounting position at the above location, and may be mounted anywhere as long as it is in contact with the blade member. Further, in this embodiment, one roller is attached so that the blade members of the leading blade and the trailing blade are in contact with each other at a position retracted from the exposure opening. However, each roller contacts with a plurality of rollers. You may do it. For example, a roller is attached so that the tip of the blade member contacts the roller at a position retracted from the exposure opening, a position in the middle of covering the exposure opening, and a position covering the exposure opening. The blade member may come into contact with another roller before leaving the roller. When the roller is attached in this manner, the effect of further protecting the surface of the blade member is enhanced.

  Next, Example 2 will be described with reference to FIG. In the present embodiment, a sphere is attached instead of the roller in the first embodiment, and the other configuration is the same as that of the first embodiment, and thus the description thereof is omitted.

  The rotating spheres 21 and 23 attached to the shutter base plate 1 and the cover plate 2 will be described with reference to FIG. 9A is a perspective view showing a state in which the sphere 21 is attached to the attachment portion 1m of the shutter base plate 1, and FIG. 9B is a perspective view of the sphere 21 attached to the attachment portion 1m of the shutter base plate 1. FIG. It is sectional drawing which showed a mode that it is. A spherical body 21 is rotatably attached to an attachment portion 1m formed on the surface of the shutter base plate 1 on the blade chamber side so as to be in contact with the tip portion of the blade member of the leading blade. A mounting portion 1m for attaching the sphere 21 is formed as a recess in the shutter base plate 1. And the attaching part 1m consists of the disk-shaped recessed part 1m-1 for attaching the pressing member 22, and the hemispherical recessed part 1m-2 formed in the center of this recessed part 1m-1 in order to attach the spherical body 21. It has become. When the sphere 21 is attached to the attachment portion 1m, the sphere 21 is first fitted in the recess 1m-2, and then the pressing member 22 is attached to the recess 1m-1. Similar to the mounting portion 1k in the first embodiment, the mounting portion 1m is formed at a position where the sphere 21 comes into contact with the tip portion of the blade member 18 when the leading blade overlaps and retracts below the exposure opening. Has been.

  Similarly, when the rear blade is superimposed on the cover plate 2 and retracts to the upper side of the exposure opening, the spherical body 23 uses the mounting member 24 so as to come into contact with the tip of the blade member of the rear blade. The mounting portion 2b is attached to the mounting portion 2b.

  The spheres 21 and 23 attached in this manner are rotated in contact with each blade member when the shutter blades are operated, as with the rollers 19 and 20 in the first embodiment, but the rollers 19 and 20 are fixed. The spheres 21 and 23 rotate only in the direction along the rotation axis, but the rotation axis is not fixed and the rotation direction is not specified, and the spheres 21 and 23 rotate freely according to the operating direction of the blade member. be able to. Therefore, the moving direction of the blade member of the shutter blade and the rotating direction of the spheres 21 and 23 can be completely matched, and the effect that the operating speed of the shutter blade can be further improved is obtained.

  Similar to the rotating roller in the first embodiment, the rotating sphere in the present embodiment is also attached to a position where the blade member comes into contact with the tip when the blade members are overlapped and retracted from the exposure opening. However, as long as the attachment position is a place which contacts the front-end | tip part of a blade | wing member, you may attach anywhere and you may attach two or more.

  In each of the above embodiments, the present invention is applied to a focal plane shutter of a type that includes two blade chambers using a shutter base plate, a cover plate, and an intermediate plate and includes a front blade and a rear blade. However, the embodiment of the present invention is not limited to such a type of focal plane shutter, and is also applicable to a type of focal plane shutter that includes a shutter blade and a single blade chamber using a shutter base plate and a cover plate. can do.

Shutter base plate 1
Opening 1a
Long hole 1b, 1c
Shaft 1d, 1e, 1f, 1g, 1h, 1i, 1j
Mounting part 1k, 1m, 2a, 2b
Cover plate 2
Intermediate plate 3
Buffer member 4,5
Rear blade drive member 6
Drive pin 6a, 7a
Driving member for leading blade 7
Set member 8
Arm 9, 10, 14, 15
Hole 9a, 15a
Blade member 11, 12, 13, 16, 17, 18
Coro 19, 20
Torso 19a, 20a
Shaft part 19b, 20b
Sphere 21, 23
Holding member 22, 24

Claims (3)

  A synthetic resin shutter base plate having an opening for a subject optical path, and a cover having an opening for the subject optical path and attached to the shutter base plate and forming a blade chamber between the shutter base plate and the shutter base plate A plate, a plurality of arms, and a blade member pivotally supported by the arms, and one end of each of the arms with respect to a plurality of blade mounting shafts erected on the shutter base plate in the blade chamber At least one shutter blade that is individually rotatably attached to the surface of the shutter base plate or the cover plate on the blade chamber side of the shutter blade when the shutter blade operates. A focal plane shutter for a camera, wherein a rotating member that rotates in contact with a blade member is attached.   2. The focal plane shutter for a camera according to claim 1, wherein the rotating member is a roller attached so as to rotate along a traveling direction of the blade member of the shutter blade.   The focal plane shutter for a camera according to claim 1, wherein the rotating member is a sphere that is rotatably attached.

Images