JP2008145651A - Shutter device and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a focal plane shutter and a camera which are capable of securing sufficient light shielding performance. <P>SOLUTION: A shutter device is so composed that light shielding blades 131 and 141 are pressed in an optical axis direction by a front curtain guide plate 150 and a rear curtain guide plate 160 in accordance with movement of the blades 131 and 141 during exposure. The shutter device is so configured that blades 131 and 141 pressed in the optical axis direction by the front curtain guide plate 150 and the rear curtain guide plate 160 are released in accordance with movement of the blades 131 and 141 upon reset. Thus fluttering and vibration of the blades 131 and 141 are suppressed when the blades are stopped, and energy loss which is caused by frictional resistance when the blades 131 and 141 elevated upon reset is small. Consequently, sufficient light shielding performance can be secured without exerting adverse influences such as the increase of operation power and the reduction of high-speed operation performance, and quality of a picked-up image can be improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technology of a shutter device and a camera for opening and shielding a photographing aperture that guides subject light.

  In the focal plane shutter, since the shutter blades travel at a high speed, when the traveled shutter blades stop, a phenomenon such as bouncing in the traveling direction or undulation toward the incident optical axis direction of the subject light easily occurs. . When such a phenomenon occurs, light leaks from the gap between the overlapping shutter blades, so that the captured image is adversely affected.

  In order to prevent such a phenomenon, a focal plane shutter that constantly presses shutter blades with a pressing plate is known (see Patent Document 1). Further, there is known a focal plane shutter configured such that a shaft end of an arm to which a shutter blade is attached is brought into sliding contact with a guide portion so as to have a braking effect of the shutter blade (see Patent Document 2).

JP-A-10-161182 JP-A-9-179167

  However, in the conventional focal plane shutter, not only when the shutter blades are stopped, but also when starting to run in the opposite direction again after stopping, the load is applied to the shaft ends of the shutter blades and the arm, which increases power consumption. And there is a concern about the deterioration of high-speed continuous shooting performance.

(1) A shutter device according to a first aspect of the present invention includes a shutter blade that travels in a direction substantially orthogonal to the optical axis of subject light incident on the photographing aperture, opens and shields the photographing aperture, and a shutter blade during exposure. And a pressing member that presses the shutter blade in the optical axis direction by movement and releases the shutter blade pressed in the optical axis direction by the movement of the shutter blade at the time of return.
(2) According to a second aspect of the present invention, in the shutter device according to the first aspect, the pressing member moves in the traveling direction by the movement of the shutter blade at the time of exposure and presses the shutter blade toward the optical axis direction. Features.
(3) According to a third aspect of the present invention, in the shutter device according to the first or second aspect, the pressing member includes a conversion unit that converts the movement of the traveling shutter blade into the movement in the optical axis direction. And
(4) According to a fourth aspect of the present invention, in the shutter device according to the third aspect, the shutter device further includes a guide member that guides the shutter blade when the shutter blade travels in a direction substantially orthogonal to the optical axis. It is provided in the guide member.
(5) According to a fifth aspect of the present invention, in the shutter device according to the fourth aspect, the pressing member contacts the front end of the traveling shutter blade in the traveling direction and moves in a direction substantially orthogonal to the optical axis together with the shutter blade. And the pressing portion that presses the shutter blade toward the optical axis direction, and the conversion portion moves in a direction substantially perpendicular to the optical axis when the contacting portion is in contact with the front end. The movement is changed to a movement in which the pressing unit presses the shutter blade toward the optical axis direction.
(6) According to a sixth aspect of the present invention, in the shutter device according to the fifth aspect, the pressing member biases the abutting portion toward a direction opposite to the traveling direction of the shutter blades at the time of exposure. It further has these.
(7) According to a seventh aspect of the present invention, in the shutter device according to the sixth aspect of the invention, the converting portion moves the contact portion in the opposite direction due to the urging force of the urging portion, and the pressing portion releases the shutter blade. It is characterized by changing to a movement to do.
(8) According to an eighth aspect of the present invention, in the shutter device according to any one of the first to seventh aspects, the shutter blade is a first-curtain shutter blade that first travels at the time of exposure to open the photographing aperture; Sometimes the front curtain shutter blades start running and the rear curtain shutter blades that start running to shield the shooting apertures, and the pressing member is at least one of the front curtain shutter blades and the rear curtain shutter blades At least one shutter blade is provided so as to press the shutter blade toward the optical axis direction.
(9) The invention of claim 9 is the shutter device according to any one of claims 1 to 8, further comprising a traveling mechanism for causing the shutter blade to travel in a direction substantially perpendicular to the optical axis, and the shutter blade. Is characterized in that one end along a direction perpendicular to the traveling direction and the optical axis direction is connected to the traveling mechanism, and the other end is pressed toward the optical axis direction by a pressing member.
(10) A camera according to a tenth aspect of the invention includes the shutter device according to any one of the first to ninth aspects.

According to the first aspect of the present invention, sufficient light shielding performance can be secured without adverse effects such as an increase in operating power and a decrease in high-speed operating performance.
According to the tenth aspect of the present invention, sufficient light shielding performance can be ensured without adversely affecting the power consumption and high-speed continuous shooting performance, and the image quality of the captured image can be improved.

--- First embodiment ---
A first embodiment in which a shutter device and a camera according to the present invention are applied to an electronic camera will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a digital still camera according to this embodiment as viewed from the side. For convenience of explanation, front and rear, right and left, and up and down directions are defined as shown in each drawing. The horizontal direction is defined so as to coincide with the horizontal direction when the digital still camera is viewed from the front. This digital still camera CA is an interchangeable lens single-lens reflex type, and an interchangeable lens LB having a photographing lens L is attached to the camera body CB via a lens mount 21. The photographic light flux that has passed through the photographic lens L is guided into the camera body CB through the opening 21a of the lens mount 21, reflected by the mirror 22 and imaged on the finder screen 23, and is passed through the pentaprism 24 and the eyepiece 25. Observed through.

  When the release operation is performed, the mirror 22 is flipped up and retracted from the photographing optical path, and then the focal plane shutter 100 as a shutter device is driven, and the transmitted light flux of the photographing lens L is passed through the optical filter 201 to the CCD or the like. Incident on the image sensor 250. The photoelectric conversion output of the image sensor 250 is subjected to various processes by an image processing circuit (not shown) to generate digital image data. The imaging element 250 and the filter 201 are integrated in advance as an imaging unit UN. Note that an imaging element (for example, CMOS) other than a CCD may be used for the imaging element 250.

  FIG. 2 is an exploded view of the focal plane shutter 100 when viewed from an obliquely rear side of the camera body CB. The focal plane shutter 100 includes a shutter base plate 110, a shutter cover 120, an intermediate plate 101, a front curtain light shielding blade portion 130, a rear curtain light shielding blade portion 140, a front curtain guide plate 150, and a rear curtain guide plate 160. It has. When the focal plane shutter 100 is attached to the camera body CB, a front curtain drive lever and a rear curtain drive lever (not shown) driven by a drive mechanism (not shown) are arranged on the front surface of the focal plane shutter 100. Is done. The front curtain drive lever drives the front curtain light shielding blade portion 130, and the rear curtain drive lever drives the rear curtain light shielding blade portion 140.

  The shutter base plate 110 is a substrate on which components constituting the focal plane shutter 100 are disposed. The shutter base plate 110 is provided with a photographing opening 111 for guiding a subject image to the image sensor 250 and elongated holes 112 and 113. The photographing aperture 111 has a substantially rectangular shape, and the length in the left-right direction is longer than the length in the vertical direction.

  The shutter cover 120 is a plate-like member attached to the rear surface side of the shutter base plate 110. The shutter cover 120 is provided with an opening 121 and elongated holes 122 and 123. The intermediate plate 101 is a plate-like member provided between the shutter base plate 110 and the shutter cover 120, and the opening 102 is provided so as to correspond to the photographing opening 111 and the opening 121. A front curtain guide plate 150 and a rear curtain guide plate 160, which will be described later, are attached to the intermediate plate 101.

  The front curtain light shielding blade portion 130 includes three front curtain light shielding blades 131, a front curtain main arm 132, and a front curtain driven arm 133. The rear curtain light shielding blade portion 140 includes three rear curtain light shielding blades 141, a rear curtain main arm 142, and a rear curtain driven arm 143. The front curtain light shielding blade portion 130 is disposed in front of the intermediate plate 101, and the rear curtain light shielding blade portion 140 is disposed behind the intermediate plate 101. Each arm 132, 133, 142, 143 is pivotally supported on the rear surface of the shutter base plate 110 so as to be rotatable. Three front curtain light shielding blades 131 are rotatably attached to the front curtain main arm 132 and the front curtain driven arm 133 by caulking pins. Similarly, three rear curtain light shielding blades 141 are rotatably attached to the rear curtain main arm 142 and the rear curtain driven arm 143 by caulking pins.

  Since the front curtain main arm 132 and the front curtain driven arm 133 constitute a known link mechanism, when the front curtain main arm 132 and the front curtain driven arm 133 are rotationally driven with respect to the shutter base plate 110, the three The front curtain shading blade 131 is driven in conjunction so as to move up and down behind the photographing aperture 111. Similarly, when the rear curtain main arm 142 and the rear curtain follower arm 143 are rotationally driven with respect to the shutter base plate 110, the three rear curtain light shielding blades 141 are interlocked so as to move up and down behind the photographing opening 111. Driven. That is, each arm 132, 133, 142, 143 is a traveling mechanism for causing the light shielding blades 131, 141 to travel in a direction substantially orthogonal to the optical axis.

  The front curtain main arm 132 and the rear curtain main arm 142 are provided with holes 132a and 142a, and pins of the front curtain drive lever and the rear curtain drive lever (not shown) penetrating through the elongated holes 112 and 113 of the shutter base plate 110 are front-faced. Inserted from the side. When the pin of the front curtain drive lever that fits into the hole 132a is driven along the elongated hole 112, the front curtain main arm 132 is driven to rotate with respect to the shutter base plate 110. The blades 131 are driven in conjunction with each other. Similarly, when the pin of the rear curtain drive lever that fits into the hole 142a is driven along the elongated hole 113, the rear curtain main arm 142 is rotationally driven with respect to the shutter base plate 110. The trailing curtain shading blade 141 is driven in conjunction.

  Before the release, the front curtain light shielding blade 131 shields the photographing opening 111, and the rear curtain light shielding blade 141 is stored above the photographing opening 111. When a release button (not shown) is pressed, the front curtain shading blade 131 travels downward and opens the photographing opening 111. After a predetermined time has elapsed from the start of traveling of the front curtain light shielding blade 131, the rear curtain light shielding blade 141 starts traveling downward to shield the photographing aperture 111. FIG. 2 shows a state where the front curtain light shielding blade 131 and the rear curtain light shielding blade 141 travel downward after the release, and the rear curtain light shielding blade 141 shields the photographing opening 111.

  FIG. 3 is an exploded view showing only the front curtain guide plate 150 and the front curtain light shielding blade 130. FIG. 3 shows a state in which the front curtain light-shielding blade 131 stops after traveling downward. The front curtain guide plate 150 is a plate-like member fixed in the vicinity of the right front end portion of the front surface of the intermediate plate 101, guides the right end portion of the traveling front curtain light shielding blade 131, and downwards as will be described later. The front curtain shading blade 131 that has traveled is pressed rearward along the optical axis direction. The front curtain guide plate 150 is provided at a guide portion 151 that extends in the vertical direction, an attachment portion 152 that is attached to the front surface of the intermediate plate 101, and a lower portion of the guide portion 151. The front curtain guide plate 150 travels downward. And a pressing portion 153 that presses the blade 131 toward the rear.

  The guide part 151 is formed so as to form a substantially flat surface extending in the vertical direction. The attachment portion 152 is a portion provided so as to branch from the guide portion 151, the lower end is connected to the guide portion 151, is located on the same plane as the guide portion 151, and is bent obliquely rearward from the lower end upward. So as to extend vertically. An upper end 152a of the attachment portion 152 is bent downward. The attachment portions 152 are provided at two locations, an upper portion and a lower portion of the front curtain guide plate 150.

  The pressing portion 153 is a portion provided at the lower portion of the guide portion 151, and includes a contact portion 153a with which the lower end of the front curtain light-shielding blade 131 that has traveled downward contacts and a front curtain light-shielding blade that has traveled downward. And a pressing surface 153b that presses 131 backward along the optical axis direction. The contact portion 153a is a portion where the lower end of the guide portion 151 is bent upward, and as shown by an arrow a in FIG. 3, the lower end of the front curtain light shielding blade 131 that has traveled downward, that is, the front curtain light shielding. The blade 131 is formed to receive the front end in the traveling direction. The pressing surface 153 b is a portion that is substantially flush with the guide portion 151. The position of the contact portion 153a in the front curtain guide plate 150 in the vertical direction is slightly higher than the stop position at the lower end of the front curtain light-shielding blade 131 that has traveled downward when the attachment portion 152 is attached to the intermediate plate 101. It is set to be upward.

  FIG. 4 is an exploded view showing only the rear curtain guide plate 160 and the rear curtain light shielding blade 140. FIG. 4 shows a state in which the rear curtain light-shielding blade 141 stops after traveling downward. The rear curtain guide plate 160 is a plate-like member that is fixed in the vicinity of the right side edge of the rear surface of the intermediate plate 101, guides the right edge of the traveling rear curtain light-shielding blade 141, and downwards as will be described later. The rear curtain light-shielding blade 141 that has traveled is pressed forward along the optical axis direction. The rear curtain guide plate 160 is provided in the vicinity of the guide portion 161 extending in the vertical direction, the mounting portion 162 attached to the rear surface of the intermediate plate 101, and the center of the guide portion 161 in the vertical direction, and traveled downward. A pressing portion 163 that presses the rear curtain light shielding blade 141 forward.

  The guide part 161 is formed so as to form a substantially flat surface extending in the vertical direction. The attachment portion 162 is a portion provided so as to branch from the guide portion 161, the lower end is connected to the guide portion 161, is located on the same plane as the guide portion 161, and is bent obliquely forward from the lower end upward. So as to extend vertically. An upper end 162a of the attachment portion 162 is bent downward. The attachment portions 162 are provided at two locations on the upper and lower portions of the trailing curtain guide plate 160.

  The pressing portion 163 is a portion provided in the vicinity of the center of the guide portion 161 in the vertical direction. The pressing portion 163 travels downward and a contact portion 163a that contacts the lower end of the rear-curtain shading blade 141 that travels downward. And a pressing surface 163b for pressing the rear curtain light-shielding blade 141 forward in the optical axis direction, which shields the photographing aperture 111 from light. The pressing surface 163 b is a portion facing the right end portion of the rear curtain light shielding blade 141 that shields the photographing opening 111. The contact portion 163a is a portion where the lower end of the pressing surface 163b is bent upward, and is formed so as to receive the lower end of the rear curtain light-shielding blade 141 traveling downward as indicated by an arrow b in FIG. ing. The position of the contact portion 163a in the rear curtain guide plate 160 in the vertical direction is slightly higher than the stop position at the lower end of the rear curtain light-shielding blade 141 that travels downward when the attachment portion 162 is attached to the intermediate plate 101. It is set to be upward.

  Although the guide plates 150 and 160 are different from each other in the shape of the mounting portions 152 and 162 and the presence or absence of the pressing portions 153 and 163, the conventional focal planes are used to guide the end portions of the traveling light shielding blades. It is a member similar to the guide plate provided in the shutter.

---- About movement of the leading curtain guide plate 150 ---
The movement of the leading curtain guide plate 150 will be described with reference to FIGS. FIG. 5 is a view of the inside of the focal plane shutter 100 before being released from the front. For convenience of explanation, in FIG. 5, the illustration of the rear curtain light shielding blade 140 and the rear curtain guide plate 160 is omitted. Of the three front-curtain light-shielding blades 131, the blade located at the lowest position when the photographing aperture 111 is shielded is referred to as a front-curtain light-shielding first blade 131a. Further, the blade located second from the bottom when the photographing aperture 111 is shielded is referred to as a front-curtain light-shielding second blade 131b, and the blade located at the top is referred to as a front-curtain light-shielding third blade 131c. In FIG. 5, reference numeral 103 denotes a locking portion provided on the intermediate plate 101 to which the upper end 152 a of the mounting portion 152 of the front curtain guide plate 150 is locked.

  As described above, the front curtain light shielding blade 131 shields the photographing aperture 111 before the release, and the rear curtain light shielding blade 141 is stored above the photographing aperture 111. The lower end of the front curtain light shielding first blade 131a is separated from the contact portion 153a of the front curtain guide plate 150. FIG. 6A is a diagram schematically showing the vicinity of the lower part of the front curtain guide plate 150 before the release, as viewed from the right side. As described above, since the mounting portion 152 of the front curtain guide plate 150 is curved obliquely rearward toward the upper side, when the upper end 152a is locked to the locking portion 103 of the intermediate plate 101, the front curtain guide plate The 150 guide portions 151 are separated from the intermediate plate 101 toward the front.

  When a release button (not shown) is pressed, a front curtain drive lever (not shown) is rotated in the clockwise direction in FIG. Thereby, as described above, the front curtain light-shielding blade 131 travels downward to open the photographing opening 111. When the front curtain shading blade 131 travels downward, the right end is guided by the guide portion 151 of the front curtain guide plate 150 and the forward movement is restricted. As described above, since the position of the contact portion 153a in the vertical direction is set to be slightly higher than the stop position at the lower end of the front curtain light shielding blade 131 that has traveled downward, the front curtain light shielding blade. When 131 runs downward, the lower end portion of the first curtain light shielding first blade 131a comes into contact with the contact portion 153a immediately before stopping.

  FIG. 6B is a diagram schematically showing the vicinity of the lower portion of the front curtain guide plate 150 immediately before the lower end portion of the front curtain light-shielding first blade 131a and the contact portion 153a come into contact, as viewed from the right side. . FIG. 6C is a diagram schematically showing the vicinity of the lower portion of the front curtain guide plate 150 after the lower end portion of the front curtain light-shielding first blade 131a and the contact portion 153a are in contact, as viewed from the right side. is there. When the lower end portion of the first curtain light shielding first blade 131a comes into contact with the contact portion 153a, the first curtain light shielding first blade 131a presses the contact portion 153a downward at the lower end portion.

  Since the upper end 152a is locked to the locking portion 103 of the intermediate plate 101, when the abutting portion 153a is pressed downward by the front curtain light-shielding first blade 131a, the mounting portion 152 is elastically deformed, As shown by the arrow C1 in FIG. 6C, the front curtain guide plate 150 is allowed to move downward. In other words, the attachment portion 152 corresponds to an urging portion that urges the front curtain guide plate 150 in a direction (upward) opposite to the traveling direction of the front curtain light shielding blade 131 during exposure.

  At this time, the front curtain guide plate 150 also moves rearward, so that the front curtain guide plate 150 moves downward and rearward as indicated by an arrow C2. By the movement of the front curtain guide plate 150, the pressing surface 153b presses the front curtain light-shielding blade 131 backward as indicated by an arrow C3. That is, the front curtain guide plate 150 moves in the traveling direction of the front curtain light shielding blade 131 by the movement of the front curtain light shielding blade 131 during exposure and presses the front curtain light shielding blade 131 toward the optical axis direction (rear). In this manner, the attachment portion 152 converts the movement of the traveling front curtain light blocking blade 131 into the movement of the front curtain guide plate 150 in the optical axis direction.

  The amount of backward movement of the front curtain guide plate 150 is such that the three front curtain light shielding blades 131 are pressed against the pressing surface for the first time when the front curtain light shielding first blade 131a travels to the position immediately before stopping after contacting the contact portion 153a. It is set to be sandwiched between 153b and the front surface of the intermediate plate 101. Therefore, when the front curtain light-shielding blade 131 travels downward, the frictional resistance caused by being sandwiched between the pressing surface 153 b and the front surface of the intermediate plate 101 is applied to the front curtain light-shielding blade 131 until just before the front curtain light-shielding blade 131 stops. Does not work. However, when the front curtain light-shielding first blade 131a presses the contact portion 153a downward, it receives a reaction force due to the elastic force of the mounting portion 152, so that the impact force at the time of stopping is absorbed. Further, when the front curtain light shielding blade 131 travels to the stop position, a frictional resistance caused by being sandwiched between the pressing surface 153 b and the front surface of the intermediate plate 101 acts on the front curtain light shielding blade 131.

  The impact absorbing function and the frictional action suppress the vertical bounce (flapping) when the front curtain light-shielding blade 131 is stopped. Thus, the intermediate plate 101 and the front curtain guide plate 150 serve as a brake for stopping the front curtain light-shielding blade 131 that travels downward. It is desirable that the reaction force due to the elastic force of the mounting portion 152 is appropriately set so as to efficiently absorb the impact force when the front curtain light shielding blade 131 is stopped.

  Further, since the front curtain light-shielding blade 131 is pressed rearward, vibration (swimming) in the front-rear direction of the front curtain light-shielding blade 131 is also suppressed, and the front curtain light-shielding blade 131 is rubbed or damaged, and generation of wear dust is generated. Such a problem is suppressed. When the front curtain guide plate 150 moves rearward in the optical axis direction due to the deformation of the mounting portion 152, a force that moves forward in the optical axis direction acts on the intermediate plate 101 as a reaction. Therefore, even if the front curtain guide plate 150 presses the front curtain light shielding blade 131 rearward, the intermediate plate 101 does not move rearward and the travel path of the rear curtain light shielding blade 141 is not narrowed.

  In the conventional focal plane shutter, a brake member whose width in the optical axis direction is gradually narrowed along the traveling direction of the blade is used to brake the light shielding blade by sandwiching the traveling light shielding blade. There is something to do. However, in the conventional focal plane shutter, the light shielding blade is gradually sandwiched by the brake member, so that the friction between the brake member, the light shielding blade, and the light shielding blade is along the traveling direction of the light shielding blade. Occurs over long distances.

  On the other hand, in the focal plane shutter 100 of the present embodiment, although the friction between the pressing surface 153b and the intermediate plate 101 and the front curtain light shielding blade 131 and the front curtain light shielding blade 131 occurs, the front curtain light shielding blade 131 stops. It only occurs at a short distance just before. Also, between the front-curtain light-shielding first blade 131a and the pressing portion 153, the lower end portion of the front-curtain light-shielding first blade 131a abuts on the abutting portion 153a, and the pressing portion 153 moves downward together with the front-curtain light shielding first blade 131a. Therefore, there is no rubbing in the vertical direction. For this reason, the focal plane shutter 100 according to the present embodiment has a very small distance at which rubbing occurs compared to the conventional focal plane shutter.

  FIG. 6D is a schematic diagram when the vicinity of the lower part of the front curtain guide plate 150 is viewed from the right side when the front curtain shading blade 131 moves to the lowest position and stops. FIG. 7 is a view of the inside of the focal plane shutter 100 in the same state as FIG. 6D as viewed from the front. For the convenience of explanation, in FIG. 7, illustration of the rear curtain light shielding blade 140 and the rear curtain guide plate 160 is omitted. When the front curtain light shielding blade 131 moves to the lowest position, the front curtain light shielding blade 131 is held in a state of being sandwiched between the pressing surface 153b and the front surface of the intermediate plate 101 as described above.

  Subsequent to the front curtain light shielding blade 131, the rear curtain light shielding blade 141 starts to travel and shields the photographing aperture 111. Thereby, the photographing opening 111 is opened for a predetermined time. In the meantime, the transmitted light beam of the photographing lens L enters the image sensor 250 through the optical filter 201, and the subject image is captured.

  After the subject image is captured by the image sensor 250, a reset operation including a shutter charge operation is started. When the reset operation is started, a front curtain drive lever and a rear curtain drive lever (not shown) are rotated counterclockwise in FIG. 7 by a driving force of a drive motor (not shown). As a result, the front curtain main arm 132 and the rear curtain main arm 142 are rotated counterclockwise in the figure, and the front curtain light shielding blade 131 and the rear curtain light shielding blade 141 start to travel upward.

  When the front curtain light-shielding blade 131 moves slightly upward, the front curtain guide plate 150 moves upward while being moved forward by the elastic force of the mounting portion 152. That is, only by slightly moving the front curtain light shielding blade 131 upward, the pressing surface 153b that presses the right end portion of the front curtain light shielding blade 131 toward the intermediate plate 101 moves forward, and the pressing surface 153b. The front curtain light shielding blade 131 is released from the holding of the front curtain light shielding blade 131 by the intermediate plate 101. The attaching portion 152 converts the upward movement due to the elastic force into a movement in which the pressing surface 153b opens the front curtain light shielding blade 131.

  As a result, the frictional resistance acting on the front-curtain light-shielding blade 131 due to being pressed backward by the pressing surface 153b is eliminated, so that the front-curtain light-shielding blade 131 can easily move upward. In addition, since the front curtain guide plate 150 is moved forward by the elastic force of the mounting portion 152, the traveling path of the front curtain light-shielding blade 131 can be ensured reliably. It should be noted that the front curtain guide plate has the elastic force of the mounting portion 152 directed in the direction opposite to the traveling direction of the front curtain light shielding blade 131 during exposure, that is, upward in the charging direction of the front curtain light shielding blade 131. Since 150 is energized, no extra load is applied during shutter charging.

  In the conventional focal plane shutter, since the light shielding blade is sandwiched between the brake members as described above, even when the front curtain light shielding blade rises at the time of resetting, the distance is long along the traveling direction of the light shielding blade. Friction resistance was generated by the brake member. On the other hand, in the focal plane shutter 100 according to the present embodiment, the front curtain light shielding blade 131 is held between the pressing surface 153b and the intermediate plate 101 only by moving the front curtain light shielding blade 131 slightly upward as described above. From the front curtain shading blade 131 is released. For this reason, the energy loss due to frictional resistance when the front curtain light-shielding blade 131 rises at the time of resetting is small.

  In this way, the front curtain guide plate 150 guides the right end of the traveling front curtain light shielding blade 131 and serves as a brake for stopping the front curtain light shielding blade 131 traveling downward. Suppresses 131 flapping and swimming.

---- About the movement of the trailing curtain guide plate 160 ---
The movement of the trailing curtain guide plate 160 will be described with reference to FIGS. The movement of the trailing curtain guide plate 160 is the same as the movement of the leading curtain guide plate 150. FIG. 8 is a view of the inside of the focal plane shutter 100 before the release from the front, and FIG. 9 is a view of the inside of the focal plane shutter 100 before the start of the reset after the release from the front. For the convenience of explanation, in FIGS. 8 and 9, the illustration of the front curtain light-shielding blade portion 130 and the front curtain guide plate 150 is omitted. Of the three rear curtain light shielding blades 141, the blade located at the lowest position when the photographing aperture 111 is shielded is referred to as a rear curtain light shielding first blade 141a. Further, the blade located second from the bottom when the photographing aperture 111 is shielded is referred to as a rear-curtain light-shielding second blade 141b, and the blade located at the top is referred to as a rear-curtain light-shielding third blade 141c. 8 and 9, reference numeral 104 denotes a locking portion provided on the intermediate plate 101 to which the upper end 162 a of the mounting portion 162 of the trailing curtain guide plate 160 is locked.

  As described above, the front curtain light shielding blade 131 shields the photographing aperture 111 before the release, and the rear curtain light shielding blade 141 is stored above the photographing aperture 111. The lower end of the rear curtain light shielding first blade 141a is separated from the contact portion 163a of the rear curtain guide plate 160. As described above, since the mounting portion 162 is curved obliquely rearward upward, when the upper end 162a is locked to the locking portion 104 of the intermediate plate 101 as in the case of the front curtain guide plate 150. The guide portion 161 is separated from the intermediate plate 101 toward the rear.

  When a release button (not shown) is pressed, a rear curtain drive lever (not shown) is rotated in the clockwise direction in FIG. 8 following the front curtain drive lever. As a result, as described above, the rear curtain light-shielding blade 141 travels downward to shield the photographing opening 111. When the rear curtain light-shielding blade 141 travels downward, the right end is guided by the guide portion 161 of the rear curtain guide plate 160 and the rearward movement is restricted. As described above, since the vertical position of the contact portion 163a is set to be slightly above the stop position at the lower end of the rear curtain light shielding blade 141 that has traveled downward, the rear curtain light shielding blade. When 141 runs downward, the lower end portion of the rear curtain light shielding first blade 141a comes into contact with the contact portion 163a immediately before stopping.

  FIG. 10A is a diagram schematically showing the vicinity of the lower portion of the rear curtain guide plate 160 before the lower end portion of the rear curtain light-shielding first blade 141a and the abutting portion 163a abut, as viewed from the right side. . FIG. 10B is a diagram schematically showing the vicinity of the lower part of the rear curtain guide plate 160 immediately before stopping after the rear curtain light-shielding first blade 141a comes into contact with the contact portion 163a, as viewed from the right side. It is. When the lower end portion of the rear curtain light shielding first blade 141a comes into contact with the contact portion 163a, the rear curtain light shielding first blade 141a presses the contact portion 163a downward at the lower end portion.

  Since the upper end 162a is locked to the locking portion 104 of the intermediate plate 101, when the abutting portion 163a is pressed downward by the rear curtain light shielding first blade 141a, the mounting portion 162 is elastically deformed, The rear curtain guide plate 160 is allowed to move downward. At this time, the rear curtain guide plate 160 also moves forward, so the rear curtain guide plate 160 moves downward and forward. That is, the rear curtain guide plate 160 moves in the traveling direction of the rear curtain light shielding blade 141 by the movement of the rear curtain light shielding blade 141 during exposure, and presses the rear curtain light shielding blade 141 toward the optical axis direction (forward). As described above, the mounting portion 162 converts the movement of the traveling rear curtain light shielding blade 141 into the movement of the rear curtain guide plate 160 in the optical axis direction.

  The amount of forward movement of the rear curtain guide plate 160 is such that the three rear curtain light-shielding blades 141 are pressed against the pressing surface only when the rear curtain light-shielding first blade 141a travels to the position immediately before the stop after contacting the contact portion 163a. It is set so as to be sandwiched between 163b and the rear surface of the intermediate plate 101. Therefore, when the rear curtain light shielding blade 141 travels downward, the frictional resistance caused by being sandwiched between the pressing surface 163b and the rear surface of the intermediate plate 101 causes the rear curtain light shielding blade 141 to stop immediately before the rear curtain light shielding blade 141 stops. Does not work. However, when the rear curtain light-shielding first blade 141a presses the contact portion 163a downward, it receives a reaction force due to the elastic force of the mounting portion 162, so that the impact force at the time of stopping is absorbed. Further, when the rear curtain light shielding blade 141 travels to the stop position, a frictional resistance caused by being sandwiched between the pressing surface 163b and the rear surface of the intermediate plate 101 acts on the rear curtain light shielding blade 141.

  Due to the absorbing action and frictional action of the impact force, the vertical bounce (fluttering) when the trailing curtain shading blade 141 is stopped is suppressed, so that light leakage after exposure can be prevented. In this way, the intermediate plate 101 and the rear curtain guide plate 160 serve as a brake for stopping the rear curtain light shielding blade 141 that travels downward. Furthermore, since the rear curtain light shielding blade 141 is pressed forward, vibration (swimming) of the rear curtain light shielding blade 141 in the front-rear direction is also suppressed, and the rear curtain light shielding blade 141 is rubbed or damaged and generation of wear dust is generated. Inconveniences such as light leakage are suppressed. It is desirable that the reaction force due to the elastic force of the mounting portion 162 is appropriately set so as to efficiently absorb the impact force when the trailing curtain light shielding blade 141 is stopped.

  After the subject image is captured by the image sensor 250, a reset operation including a shutter charge operation is started. When the reset operation is started, the rear curtain light-shielding blade 141 starts traveling upward as described above.

  When the rear curtain light-shielding blade 141 moves slightly upward, the rear curtain guide plate 160 moves upward while moving backward due to the elastic force of the mounting portion 162. That is, only by moving the rear curtain light shielding blade 141 slightly upward, the pressing surface 163b pressing the right end portion of the rear curtain light shielding blade 141 toward the intermediate plate 101 moves rearward, and the pressing surface 163b. Then, the rear curtain light shielding blade 141 is released from the holding of the rear curtain light shielding blade 141 by the intermediate plate 101. As a result, the frictional resistance acting on the rear curtain light shielding blade 141 due to being pushed forward by the pressing surface 163b is eliminated, and the rear curtain light shielding blade 141 can easily move upward. Further, since the rear curtain guide plate 160 is moved rearward by the elastic force of the mounting portion 162, the rear curtain light shielding blade 141 can be reliably secured. Note that the elastic force of the mounting portion 162 urges the rear curtain guide plate 160 upward, which is also the charging direction of the rear curtain light-shielding blade 141, so that no extra load is applied during shutter charging.

  Thus, the rear curtain guide plate 160 guides the right end of the traveling rear curtain light shielding blade 141 and serves as a brake for stopping the rear curtain light shielding blade 141 traveling downward. 141 Fluttering and swimming are suppressed.

The digital still camera described above has the following operational effects.
(1) The light shielding blades 131 and 141 are configured to be pressed toward the optical axis direction by the front curtain guide plate 150 and the rear curtain guide plate 160 by the movement of the light shielding blades 131 and 141 during exposure. Further, the light shielding blades 131 and 141 pressed in the optical axis direction by the front curtain guide plate 150 and the rear curtain guide plate 160 are configured to be released by the movement of the light shielding blades 131 and 141 at the time of reset. As a result, the traveling space of the light shielding blades 131 and 141 during exposure traveling can be reliably ensured, flapping and swimming when the light shielding blades 131 and 141 stop can be suppressed, and the light shielding blades 131 and 141 can be raised when resetting. Energy loss due to frictional resistance is small. Therefore, sufficient light shielding performance can be secured without adverse effects such as an increase in operating power and a decrease in high-speed operating performance, and the image quality of the captured image can be improved.

(2) The front curtain guide plate 150 and the rear curtain guide plate 160 are configured to move in the traveling direction by the movement of the light shielding blades 131 and 141 during exposure and to press the light shielding blades 131 and 141 toward the optical axis direction. . Thereby, rubbing between the front curtain guide plate 150 and the rear curtain guide plate 160 and the light shielding blades 131 and 141 can be suppressed, so that durability is improved. Moreover, since generation | occurrence | production of abrasion powder etc. is suppressed, it can suppress that the abrasion powder is reflected in the image.

(3) The mounting portions 152 and 162 are configured to convert the movement of the traveling light shielding blades 131 and 141 into the movement of the guide plates 150 and 160 in the optical axis direction. Thereby, since the light shielding blades 131 and 141 can be pressed in the optical axis direction with a simple configuration, the cost increase is small and the reliability is high.

(4) Since a conventional guide plate is used to press the light shielding blades 131 and 141 in the direction of the optical axis, the cost increases and the number of parts does not increase, and assembly is easy.

(5) Contact portions 153a and 163a that contact the front ends of the light shielding blades 131 and 141 in the traveling direction and move together with the light shielding blades 131 and 141 in a direction substantially orthogonal to the optical axis; The guide plates 150 and 160 are configured to include pressing portions 153 and 163 that press in the direction. Further, the attachment portion 152 is configured so that the movement of the contact portions 153a and 163a moving in the direction substantially orthogonal to the optical axis is changed to the movement of the pressing portions 153 and 163 pressing the light shielding blades 131 and 141 toward the optical axis direction. 162. Thereby, the structure of the guide plates 150 and 160 can be simplified, the manufacturing cost of the guide plates 150 and 160 can be suppressed, and the operation reliability can be improved.

(6) When the light shielding blades 131 and 141 are moved upward, the guide plates 150 and 160 are moved upward by the elastic force of the mounting portions 152 and 162. As a result, when the light shielding blades 131 and 141 move upward, the guide plates 150 and 160 are separated from the intermediate plate 101 and return to their original positions. Therefore, it is necessary to provide another mechanism for returning the guide plates 150 and 160. There is no. Therefore, an increase in cost can be suppressed, and the focal plane shutter 100 and the camera body CB can be reduced in size.

(7) When the light-shielding blades 131 and 141 move upward, the guide plates 150 and 160 are separated from the intermediate plate 101 by the elastic force of the mounting portions 152 and 162 so that the light-shielding blades 131 and 141 held therebetween are opened. Configured. Thereby, the energy loss by the frictional resistance when the light-shielding blades 131 and 141 rise at the time of resetting can be actively reduced.

(8) The front curtain light shielding blade 131 is configured to be pressed in the optical axis direction by the front curtain guide plate 150, and the rear curtain light shielding blade 141 is configured to be pressed in the optical axis direction by the rear curtain guide plate 160. As a result, both the front curtain light shielding blade 131 and the rear curtain light shielding blade 141 can suppress problems caused by flapping and swimming, so that sufficient light shielding performance can be reliably ensured.

(9) The right end portions of the light shielding blades 131 and 141 to which the arms 132, 133, 142, and 143 are not attached are configured to be pressed in the optical axis direction by the guide plates 150 and 160. Thereby, since the light shielding blades 131 and 141 can be directly pressed, the light of the light shielding blades 131 and 141 is not affected by shakiness of the connecting portion between the light shielding blades 131 and 141 and the arms 132, 133, 142, and 143. Axial movement can be reliably prevented, and light shielding performance can be ensured. In addition, since the guide plates 150 and 160 can be disposed in the same manner as the guide plate is disposed in the conventional focal plane shutter, the design change can be reduced, and there is no need to newly secure a layout space. This contributes to miniaturization of the focal plane shutter 100 and the camera body CB.

--- Second Embodiment ---
With reference to FIGS. 11 and 12, a second embodiment in which the shutter device and camera according to the present invention are applied to an electronic camera will be described. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be mainly described. Points that are not particularly described are the same as those in the first embodiment. This embodiment is different from the first embodiment mainly in that there is only one set of light shielding blade portions.

  FIG. 11 is an exploded view of the focal plane shutter 300 according to the second embodiment when viewed obliquely from the camera body CB. FIG. 12 is a schematic cross-sectional view of the focal plane shutter 300 immediately before the light shielding blade 341 travels downward and stops, when viewed from the left side. The focal plane shutter 300 includes a shutter base plate 110, a shutter cover 120, a light shielding blade portion 340, a first guide plate 350, and a second guide plate 360.

  The light shielding blade 340 has the same configuration as that of the rear curtain light shielding blade 140 of the first embodiment, and includes three light shielding blades 341, a main arm 342, and a driven arm 343. That is, the light shielding blade 341 corresponds to the rear curtain light shielding blade 141, the main arm 342 corresponds to the rear curtain main arm 142, and the driven arm 343 corresponds to the rear curtain driven arm 143. The main arm 342 is provided with a hole 342a corresponding to the hole 142a of the rear curtain main arm 142 of the first embodiment. Of the three light shielding blades 341, the blade located at the lowest position when the photographing aperture 111 is shielded is called a light shielding first blade 341a. Further, the blade located second from the bottom when the photographing aperture 111 is shielded is referred to as a light-shielded second blade 341b, and the blade located at the top is referred to as a light-shielded third blade 341c.

  Before the release, the light shielding blade 341 shields the photographing aperture 111. When a release button (not shown) is pressed, the light shielding blade 341 travels upward and opens the photographing opening 111. When a subject image is captured by the image sensor 250, the light shielding blade 341 travels downward to shield the photographing aperture 111. FIG. 11 shows a state where the light shielding blade 341 shields the photographing aperture 111.

  The first guide plate 350 is a plate-like member fixed in the vicinity of the right front end portion of the front surface of the shutter cover 120, guides the right end portion of the traveling light shielding blade 341, and moves the light shielding blade 341 traveling upward. Press backward along the optical axis direction. The first guide plate 350 includes a guide portion 351 extending in the vertical direction, an attachment portion 352 attached to the front surface of the shutter cover 120, and a light-shielding blade 341 that is provided on the guide portion 351 and travels upward. And a pressing portion 353 that presses toward the rear.

  The guide part 351 is formed so as to form a substantially flat surface extending in the vertical direction. The attachment portion 352 is a portion provided so as to branch from the guide portion 351, the upper end is connected to the guide portion 351, is located on the same plane as the guide portion 351, and is bent obliquely rearward from the upper end downward. So as to extend vertically. A lower end 352a of the attachment portion 352 is bent upward. The attachment portions 352 are provided at two locations on the upper and lower portions of the first guide plate 350. In FIG. 12, reference numeral 125 denotes a locking portion provided on the shutter cover 120, where the lower end 352 a of the mounting portion 352 is locked.

  The pressing portion 353 is a portion provided on the upper portion of the guide portion 351, and includes a contact portion 353a with which the upper end of the light-shielding third blade 341c that has traveled upward contacts and a light-shielding blade 341 that has traveled upward. And a pressing surface 353b that presses backward along the optical axis direction. The contact portion 353a is a portion where the upper end of the guide portion 351 is bent downward, and receives the upper end of the light-shielding third blade 341c that has traveled upward, that is, the front end of the light-shielding blade 341 in the traveling direction. Is formed. The pressing surface 353b is a portion that is substantially flush with the guide portion 351. The position of the contact portion 353a in the first guide plate 350 in the vertical direction is slightly higher than the stop position of the upper end of the light-shielding third blade 341c that travels upward when the attachment portion 352 is attached to the shutter cover 120. It is set to be downward.

  The second guide plate 360 is a plate-like member fixed in the vicinity of the rear right end of the shutter base plate 110, guides the right end of the traveling light shielding blade 341, and moves the light shielding blade 341 traveling downward. Press forward along the optical axis direction. The second guide plate 360 is provided in the vicinity of the guide portion 361 extending in the vertical direction, the mounting portion 362 attached to the rear surface of the shutter base plate 110, and the center of the guide portion 361 in the vertical direction, and traveled downward. A pressing portion 363 that presses the light shielding blade 341 forward.

  The guide part 361 is formed so as to form a substantially flat surface extending in the vertical direction. The attachment portion 362 is a portion provided so as to branch from the guide portion 361. The lower end of the attachment portion 362 is connected to the guide portion 361 and is located in the same plane as the guide portion 361, and bends obliquely forward from the lower end upward. So as to extend vertically. An upper end 362a of the attachment portion 362 is bent downward. The attachment portions 362 are provided at two locations on the upper and lower portions of the second guide plate 360. In FIG. 12, reference numeral 115 denotes a locking portion provided on the shutter base plate 110 where the upper end 362 a of the mounting portion 362 is locked.

  The pressing part 363 is a part provided in the vicinity of the center of the guide part 361 in the vertical direction. The pressing part 363 travels downward and comes into contact with a contact part 363a where the lower end of the light shielding first blade 341a travels downward. And a pressing surface 363b for pressing the light shielding blade 341 that shields the photographing aperture 111 forward along the optical axis direction. The pressing surface 363b is a portion facing the right end portion of the light shielding blade 341 that shields the photographing opening 111. The contact portion 363a is a portion where the lower end of the pressing surface 363b is bent upward, and is formed so as to receive the lower end of the light shielding first blade 341a traveling downward. The vertical position of the contact portion 363a in the second guide plate 360 is slightly higher than the stop position at the lower end of the light-shielding first blade 341a that travels downward when the attachment portion 362 is attached to the shutter base plate 110. It is set to be upward.

--- About movement of each guide plate 350,360 ---
As described above, before the release, the light shielding blade 331 shields the photographing opening 111 from light. At this time, the lower end of the light shielding first blade 341a is in contact with the contact portion 363a of the second guide plate 360 to press the contact portion 363a downward. Therefore, the attachment portion 362 is elastically deformed, and the second guide plate 360 moves downward and forward. Accordingly, the three light shielding blades 341 are sandwiched between the pressing surface 363 b and the rear surface of the guide portion 351 of the first guide plate 350.

  When a release button (not shown) is pressed, a drive lever (not shown) is rotated. As a result, the light shielding blade 341 starts traveling upward. When the light shielding blade 341 moves slightly upward, the second guide plate 360 moves upward while moving backward by the elastic force of the mounting portion 362. That is, only by moving the light shielding blade 341 slightly upward, the pressing surface 363b pressing the right end portion of the light shielding blade 341 toward the front moves backward, and the pressing surface 363b and the first guide plate 350 are moved. The light shielding blade 341 is released from the holding of the light shielding blade 341 by the guide portion 351. As a result, the frictional resistance acting on the light shielding blade 341 due to being pushed forward by the pressing surface 363b is eliminated, so that the light shielding blade 341 can easily move upward.

  When the light shielding blade 341 travels upward, the right end is guided by the guide portions 351 and 361 of the guide plates 350 and 360 to restrict the movement in the front-rear direction. As described above, since the vertical position of the contact portion 353a is set to be slightly below the stop position of the upper end of the light-shielding third blade 341c that has traveled upward, the light-shielding blade 341 When traveling upward, the upper end portion of the light-shielding third blade 341c contacts the contact portion 353a immediately before stopping.

  When the upper end portion of the light shielding third blade 341c contacts the contact portion 353a, the light shielding third blade 341c presses the contact portion 353a upward at the upper end portion.

  Since the upper end 352a is locked to the locking portion 125 of the shutter cover 120, when the abutting portion 353a is pressed upward by the light shielding third blade 341c, the mounting portion 352 is elastically deformed and the first The guide plate 350 moves upward and rearward. By the movement of the first guide plate 350, the pressing surface 353b presses the light shielding blade 341 backward. The amount of movement of the first guide plate 350 to the rear is such that the three light-shielding blades 341 and the pressing surface 353b are the second when the light-shielding third blade 341c is in contact with the contact portion 353a and then travels to the position immediately before the stop. The guide plate 360 is set so as to be sandwiched between the upper front surface of the guide portion 361. Therefore, when the light shielding blade 341 travels upward, the frictional resistance caused by being sandwiched between the pressing surface 353b and the upper front surface of the guide portion 361 of the second guide plate 360 is the light shielding blade 341 until just before the light shielding blade 341 stops. Does not work.

  However, when the light-shielding third blade 341c presses the contact portion 353a upward, it receives a reaction force due to the elastic force of the mounting portion 352, so that the impact force at the time of stopping is absorbed. Further, when the light shielding blade 341 travels to the stop position, frictional resistance caused by being sandwiched between the pressing surface 353 b and the upper front surface of the guide portion 361 of the second guide plate 360 acts on the light shielding blade 341. Due to the absorbing action and frictional action of the impact force, the bounce in the vertical direction when the light shielding blade 341 is stopped is suppressed, so that there is no adverse effect during exposure. In this way, the second guide plate 360 and the first guide plate 350 serve as a brake that stops the light shielding blade 341 that travels upward. Further, since the light shielding blade 341 is pressed rearward, vibration (swimming) in the front-rear direction of the light shielding blade 341 is also suppressed, and problems such as rubbing and scratching of the light shielding blade 341 and generation of wear dust are suppressed. .

  The light shielding blade 341 opens the photographing aperture for a predetermined time. In the meantime, the transmitted light beam of the photographing lens L enters the image sensor 250 through the optical filter 201, and the subject image is captured.

  After the subject image is captured by the image sensor 250, a reset operation including a shutter charge operation is started. When the reset operation is started, a driving lever (not shown) is rotated in a direction opposite to that at the time of release by a driving force of a driving motor (not shown). As a result, the light shielding blade 341 starts traveling downward.

  When the light shielding blade 341 moves slightly downward, the first guide plate 350 moves downward while moving forward by the elastic force of the mounting portion 352. That is, only by moving the light shielding blade 341 slightly downward, the pressing surface 353b that has pressed the right end of the light shielding blade 341 rearward moves forward, and the pressing surface 353b and the second guide plate 360 are moved forward. The light shielding blade 341 is released from the clamping of the light shielding blade 341. As a result, the frictional resistance acting on the light shielding blade 341 due to being pressed backward by the pressing surface 353b is eliminated, so that the light shielding blade 341 can easily move downward.

  When the light shielding blade 341 travels downward, the right end is guided by the guide portions 351 and 361 of the guide plates 350 and 360 to restrict the movement in the front-rear direction. As described above, the position of the contact portion 363a in the vertical direction is set to be slightly above the stop position of the lower end of the light shielding first blade 341a that has traveled downward. When 341a travels downward, immediately before stopping, the lower end of the first light-shielding first blade 341a contacts the contact portion 363a and presses the contact portion 363a downward.

  Since the upper end 362a is locked to the locking portion 115 of the shutter base plate 110, when the contact portion 363a is pressed downward by the light shielding first blade 341a, the mounting portion 362 is elastically deformed as described above. Thus, the second guide plate 360 moves downward and forward. The amount of forward movement of the second guide plate 360 is such that the three light-shielding blades 341 and the pressing surface 363b are the first when the light-shielding first blade 341a contacts the contact portion 363a and then travels to a position immediately before stopping. It is set so as to be sandwiched between the rear surface of the guide portion 351 of the guide plate 350. Therefore, when the light shielding blade 341 travels downward, the frictional resistance caused by being sandwiched between the pressing surface 363b and the rear surface of the guide portion 351 of the first guide plate 350 is applied to the light shielding blade 341 until just before the light shielding blade 341 stops. Does not work.

  However, when the light-shielding first blade 341a presses the contact portion 363a downward, it receives a reaction force due to the elastic force of the attachment portion 362, so that the impact force at the time of stopping is absorbed. Further, when the light shielding blade 341 travels to the stop position, a frictional resistance caused by being sandwiched between the pressing surface 363 b and the rear surface of the guide portion 351 of the first guide plate 350 acts on the light shielding blade 341. Due to the absorbing action and frictional action of the impact force, the bounce in the vertical direction when the light shielding blade 341 is stopped is suppressed, so that light leakage after exposure can be prevented. Thus, the 1st guide plate 350 and the 2nd guide plate 360 play the role of the brake which stops the light-shielding blade 341 which drive | works below. Further, since the light shielding blade 341 is pressed forward, vibration (swimming) of the light shielding blade 341 in the front-rear direction is also suppressed, and problems such as rubbing and scratching of the light shielding blade 341, generation of wear dust, and light leakage are suppressed. Is done. It is desirable that the reaction force due to the elastic force of the mounting portion 362 is appropriately set so as to efficiently absorb the impact force when the light shielding blade 341 is stopped.

The digital still camera according to the second embodiment has the following effects in addition to the effects of the first embodiment.
(1) Guide plates 350 and 360 that press the light shielding blade 341 toward the optical axis by the movement of the light shielding blade 341 are provided for the focal plane shutter 300 provided with a pair of light shielding blade portions 340. Thus, even a simple mechanical shutter (focal plane shutter) that controls the shutter speed with a so-called electronic shutter and has only one pair of shutter blades has the same effects as the effects of the first embodiment. .

(2) Since each guide plate 350, 360 is configured to press the light shielding blade 341 in the optical axis direction when the traveling of the light shielding blade 341 upward and downward is stopped, the light shielding blade 341 moves either up or down. In this case, flapping and swimming are suppressed, and the durability of the light shielding blade 341 is improved.

---- Modified example ---
(1) In the above description, the attachment portions 152 and 162 have a curved shape, but the present invention is not limited to this, and the attachment portions 152 and 162 are not necessarily curved. When the guide plates 150 and 160 attached to the intermediate plate 101 are moved in the vertical direction by the light shielding blades 131 and 141, the guide plates 150 and 160 are configured to move along the optical axis direction. What is necessary is just and the shape of the attaching parts 152 and 162 is not limited to the shape mentioned above. The same applies to the attachment portions 352 and 362.

(2) In the above description, each of the front curtain light shielding blade 131 and the rear curtain light shielding blade 141 is configured to press the light shielding blades 131 and 141 in the optical axis direction when the light shielding blades 131 and 141 are stopped at the time of release. However, the present invention is not limited to this. For example, only one of the front curtain light shielding blade 131 and the rear curtain light shielding blade 141 may be pressed in the optical axis direction when the light shielding blades 131 and 141 are stopped during the release. When only one of the front curtain light shielding blade 131 and the rear curtain light shielding blade 141 is pressed in the optical axis direction when the light shielding blades 131 and 141 are stopped at the time of release, the front curtain light shielding blade 131 is pressed. It is more effective.

(3) In the second embodiment described above, when the light shielding blade 341 moves upward and stops, the first guide plate 350 presses the light shielding blade 341 in the optical axis direction. Further, when the light shielding blade 341 moves downward and stops, the second guide plate 360 is configured to press the light shielding blade 341 in the optical axis direction. However, the present invention is not limited to this. For example, as shown in FIG. 13, the guide plate 370 may be configured to press in the optical axis direction when stopping, regardless of the moving direction of the light shielding blade 341.

  FIGS. 13A to 13C are schematic cross-sectional views of the focal plane shutter 400 provided with the guide plate 370 when viewed from the right side. The guide plate 370 includes a guide portion 371, an attachment portion 372, an upper contact portion 373U, and a lower contact portion 373D, and is disposed behind the light shielding blade 341. The guide plate 370 is attached to the shutter base plate 110 by the attachment portion 372. When the upper end portion and the lower end portion of the light shielding blade 341 are not in contact with any of the contact portions 373U and 373D, the guide plate 370 is attached from the rear surface of the shutter base plate 110. The guide portion 371 is supported so as to be separated.

  As shown in FIG. 13B, when the lower end portion of the light shielding first blade 341a contacts the lower contact portion 373D and presses the lower contact portion 373D downward, the mounting portion 372 is elastically deformed. Then, the guide part 371 is moved downward and forward. As a result, the guide portion 371 presses the light shielding blade 341 forward and sandwiches the light shielding blade 341 with the rear surface of the shutter base plate 110.

  Similarly, as shown in FIG. 13C, when the upper end portion of the light-shielding third blade 341c comes into contact with the upper contact portion 373U and presses the upper contact portion 373U upward, the attachment portion 372 is elastically deformed. Then, the guide part 371 is moved upward and forward. As a result, the guide portion 371 presses the light shielding blade 341 forward and sandwiches the light shielding blade 341 with the rear surface of the shutter base plate 110. By comprising in this way, in addition to the effect mentioned above, there exists an effect that the number of parts can be reduced and cost can be reduced.

(4) In the above description, each guide plate 150, 160, 350, 360, and 370 is configured to press the light shielding blade in the optical axis direction by the movement of the light shielding blade in the vertical direction. Is not limited to this. For example, as shown in the conceptual diagram of FIG. 14, the pressing lever 380 may be rotated by the movement of the light shielding blade 341 to press the light shielding blade 341 in the optical axis direction.

  The pressing lever 380 is a lever provided so as to be rotatable about a rotating shaft 385, and includes a contact portion 383a and a pressing portion 383b. The pressing lever 380 is urged counterclockwise by a spring 386 in the drawing. When the light shielding blade 341 travels downward, the lower end portion of the first light shielding blade 341a contacts the contact portion 383a of the pressing lever 380 and presses the contact portion 383a downward, as indicated by an arrow d1. As a result, the pressing lever 380 rotates around the rotation shaft 385 in the clockwise direction in the figure against the urging force of the spring 386 (arrow d2). By rotating the pressing lever 380 in the clockwise direction in the drawing, the pressing portion 383b presses the light shielding first blade 341a toward the right side in the drawing as indicated by an arrow d3.

  Thereafter, when the light shielding blade 341 starts traveling upward, the pressing lever 380 is rotated about the rotation shaft 385 in the counterclockwise direction by the urging force of the spring 386, so that the light shielding first blade 341a is pressed. The pressed portion 383b is retracted to the left side in the figure. As a result, the light-shielding first blade 341a can move upward without being affected by the pressing portion 383b. By comprising in this way, there exists an effect similar to the effect mentioned above.

(5) In the above description, since the pressing portion 153 is provided at the lower end portion of the guide portion 151, the guide portion 151 and the pressing surface 153b are located on the same plane. Is not limited to this. For example, the pressing surface 153 b may be offset forward or backward with respect to the guide portion 151 and may not be located on the same plane as the guide portion 151. The same applies to the other guide plates 160, 350, 360, and 370.

(6) In the above description, the front curtain light shielding blade portion 130 is disposed in front of the intermediate plate 101 and the rear curtain light shielding blade portion 140 is disposed behind the intermediate plate 101. The arrangement position of the curtain light-shielding blade 140 may be changed. In this case, the front and rear positions of the guide plates 150 and 160 need to be switched. Note that the intermediate plate 101 may be omitted.

(7) In the first embodiment described above, the strength of the elastic force of the mounting portion 152 and the mass of the front curtain guide plate 150 are not particularly mentioned, but the traveling speed, material, and mass of the front curtain light shielding blade 131 are not mentioned. The strength of the elastic force of the mounting portion 152 and the mass of the leading curtain guide plate 150 may be appropriately set according to the above. Thereby, the brake effect and the bounce prevention effect by the front curtain guide plate 150 can be optimized. The same applies to the other guide plates 160, 350, 360, and 370.

(8) Although not particularly mentioned in the above description, a member having a high coefficient of friction is attached to or applied to the surface of each guide plate 150, 160, 350, 360, 370 that contacts the light shielding blade in the optical axis direction. May be performed.

(9) In the above description, the right end portion of the light shielding blades 131 and 141 to which the arms 132, 133, 142, and 143 are not attached is configured to be pressed in the optical axis direction by the guide plates 150 and 160. The present invention is not limited to this. For example, the arms 132, 133, 142, and 143 may be configured to press in the optical axis direction.
(10) Each embodiment and modification described above may be combined.

  The present invention is not limited to the above-described embodiment, and the shutter blades that travel in a direction substantially orthogonal to the optical axis of the subject light incident on the photographing aperture to open and shield the photographing aperture; Shutter devices having various structures, comprising: a pressing member that presses the shutter blade toward the optical axis direction by the movement of the shutter blade at the time of exposure, and releases the shutter blade pressed toward the optical axis direction by the movement of the shutter blade at the time of return And a camera including this shutter device.

It is sectional drawing which looked at the digital still camera to which this invention is applied from the side. It is an exploded view when the focal plane shutter 100 is seen from the obliquely rear side of the camera body CB. It is an exploded view showing only the front curtain guide plate 150 and the front curtain light shielding blade portion 130. It is an exploded view showing only the rear curtain guide plate 160 and the rear curtain light shielding blade 140. It is the figure which looked at the inside of the focal plane shutter 100 before a release from the front. FIG. 6 is a view schematically showing the vicinity of the lower part of the front curtain guide plate 150 as viewed from the right side. It is the figure which looked at the inside of focal plane shutter 100 when front curtain shade blade 131 moved to the lowest position and stopped from the front. It is the figure which looked at the inside of the focal plane shutter 100 before a release from the front. It is the figure which looked at the inside of the focal plane shutter 100 before the reset start after a release from the front. It is the figure which showed typically the lower part vicinity of the trailing-curtain guide plate 160 seen from the right side. It is an exploded view when the focal plane shutter 300 of 2nd Embodiment is seen from the diagonally back of the camera body CB. It is a cross-sectional schematic diagram when the focal plane shutter 300 immediately before the light-shielding blade 341 travels downward and stops is viewed from the left side. It is a figure which shows a modification. It is a figure which shows a modification.

Explanation of symbols

100, 300, 400 Focal plane shutter
130 1st curtain light shielding blade part 131 1st curtain light shielding blade 140 2nd curtain light shielding blade part 141 2nd curtain light shielding blade 150 1st curtain guide plate 151, 161, 351, 361, 371 Guide part 152, 162, 352, 362, 372 Mounting part 153 , 163, 353, 363 Pressing portion 160 Rear curtain guide plate 340 Shading blade portion 341 Shading blade 350 First guide plate 360 Second guide plate 370 Guide plate 380 Pressing lever

Claims (10)

A shutter blade that travels in a direction substantially orthogonal to the optical axis of the subject light incident on the photographing aperture, and opens and shields the photographing aperture;
A pressing member that presses the shutter blade toward the optical axis direction by the movement of the shutter blade during exposure and releases the shutter blade pressed toward the optical axis direction by the movement of the shutter blade during return. A shutter device comprising: The shutter device according to claim 1,
The shutter member moves in the traveling direction by the movement of the shutter blades during exposure and presses the shutter blades in the optical axis direction. The shutter device according to claim 1 or 2,
The said pressing member has a conversion part which converts the motion of the said shutter blade to drive | work to the motion of the said optical axis direction, The shutter apparatus characterized by the above-mentioned. The shutter device according to claim 3.
A guide member for guiding the shutter blade when the shutter blade travels in a direction substantially perpendicular to the optical axis;
The shutter device, wherein the pressing member is provided on the guide member. The shutter device according to claim 4,
The pressing member abuts a front end of the traveling shutter blade in the traveling direction and moves together with the shutter blade in a direction substantially perpendicular to the optical axis, and the shutter blade faces the optical axis direction. And a pressing part that presses to press down,
The converting portion presses the movement of the contact portion in contact with the front end in a direction substantially orthogonal to the optical axis so that the pressing portion presses the shutter blade toward the optical axis direction. A shutter device characterized by being changed to a moving motion. The shutter device according to claim 5,
The shutter device further includes a biasing portion that biases the contact portion in a direction opposite to a traveling direction of the shutter blades during exposure. The shutter device according to claim 6,
The said conversion part changes the movement to the said opposite direction of the said contact part by the urging | biasing force of the said urging | biasing part to the movement which a press part releases the said shutter blade | blade, The shutter apparatus characterized by the above-mentioned. In the shutter device according to any one of claims 1 to 7,
The shutter blade first travels during exposure to open the photographing aperture, and after the front curtain shutter blade starts traveling during exposure and travels to shield the photographing aperture. Curtain shutter blades,
The shutter device is characterized in that at least one of the pressing members is provided so as to press at least the front-curtain shutter blade of the front-curtain shutter blade and the rear-curtain shutter blade toward the optical axis direction. In the shutter device according to any one of claims 1 to 8,
A travel mechanism for causing the shutter blades to travel in a direction substantially perpendicular to the optical axis;
The shutter blade is characterized in that one end along a direction orthogonal to the traveling direction and the optical axis direction is connected to the traveling mechanism, and the other end is pressed toward the optical axis direction by the pressing member. Shutter device.   A camera comprising the shutter device according to claim 1.

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