JP4060671B2 - Focal plane shutter for camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a focal plane shutter for a camera of a type in which a shutter blade is composed of a plurality of arms pivotally attached to a shutter base plate and one or more blades pivotally supported on each of the arms.
[0002]
[Prior art]
In a focal plane shutter for a camera, two shutter blades (referred to as front blade and rear blade) are arranged in two blade chambers formed between three plate members including a shutter base plate. When photographing, the slits formed by the shutter blades continuously form the imaging surface of the rectangular solid-state imaging device and the photosensitive surface of the film (hereinafter, these surfaces are collectively referred to as an exposure surface). Those that are exposed are known. This type of focal plane shutter is used in both silver salt cameras and digital still cameras (including those that can take moving images). Further, only one shutter blade is disposed in a blade chamber formed between two plate members including a shutter base plate, and when the exposure surface is closed at the end of photographing, the shutter blade is opened after a predetermined time. Or keep it closed until the next shot. The However, this focal plane shutter is used only in a digital still camera.
[0003]
In any type of focal plane shutter, one shutter blade is composed of a plurality of arms pivotally attached to the shutter base plate and one or more blades pivotally supported on each of the arms. When the arm is reciprocated within a predetermined angle range, the blade operates between a position covering the exposure surface and a position retracted from the front surface of the exposure surface. In addition, the shutter blade configured as described above is attached to the shutter base plate and is operated in conjunction with a drive member that reciprocates by a predetermined angle. The drive member is a blade of the shutter base plate. Since it is attached to the outdoor surface, a through hole is formed in the shutter base plate, and a drive pin provided in the drive member is inserted into the through hole and connected to one of the above arms in the blade chamber. ing. Therefore, the through-hole is normally formed as a long hole having a substantially arc shape since the drive pin reciprocates around the rotation axis of the drive member.
[0004]
[Problems to be solved by the invention]
As is well known, on the surface outside the blade chamber of the shutter base plate, in addition to the drive member described above, various components necessary for operating the shutter blades (hereinafter collectively referred to as a shutter opening / closing mechanism) are provided. A lot attached The However, most of them are attached relatively close to the slot. In addition, these members are actuating members that rotate during setting operation and exposure operation, members that are in sliding contact with these actuating members, and members that are in contact with these actuating members, Therefore, in the vicinity of the long hole, every time the shutter is operated, fine wear powder is generated by the sliding contact or contact thereof. In addition, wear powder generated from a component (for example, a mirror driving mechanism) on the camera body side also comes to the vicinity of the long hole. In addition, some of the abrasion powder generated in the vicinity of the long hole or flying in the vicinity of the long hole directly enters the blade chamber from the long hole. Some of them are moved up by the impact of the next operation of the mirror and the mirror.
[0005]
In this way, when the wear powder enters the blade chamber from the long hole, it eventually reaches the solid-state image sensor and the film, and those exposure surfaces (in the case of a solid-state image sensor, a filter or a transparent cover disposed on the front surface). (Including the surface of the plate). If more than a predetermined amount of wear powder or large wear powder adheres to the exposure surface, a suitable shooting result cannot be obtained, and the defect is manifested in a part of the image when enlarged and reproduced. It will be converted. In particular, in the case of a digital still camera, unlike a film, since a solid-state image sensor is fixed in the camera, even if the wear powder is extremely fine, they are accumulated. Become a problem.
[0006]
By the way, it is impossible to prevent the generation of wear powder or to prevent the generated wear powder from flying on the exposure surface at all. For this reason, it is necessary to efficiently suppress wear powder and the like flying on the exposure surface. Further, the wear powder is generated not only from the shutter opening / closing mechanism as described above but also from the shutter blades arranged in the blade chamber. Therefore, conventionally, a configuration has been proposed in which wear powder generated in the blade chamber or entering the blade chamber can be suppressed as much as possible toward the exposure surface. However, a configuration that can suitably suppress the wear powder generated from the shutter opening / closing mechanism or the like before entering the blade chamber before that is not generally known.
[0007]
The present invention has been made to solve such problems, and the object of the present invention is to provide a drive member attached to a shutter base plate outside the blade chamber and a shutter blade disposed in the blade chamber. In order to connect the two to the blade chamber, wear dust generated from the shutter opening / closing mechanism and the components on the camera body side, or the like, is preferably prevented from entering the blade chamber. It is an object of the present invention to provide a focal plane shutter for a camera that can perform the above.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a focal plane shutter for a camera according to the present invention has a substantially rectangular opening for a photographing optical path and at least one oblong hole in one side region of the opening. A shutter base plate having an aperture for the photographing optical path, at least one plate member attached to the shutter base plate to form at least one blade chamber, and disposed in the blade chamber A plurality of arms pivotally attached to the shutter base plate and at least one blade pivotally supported by each of the arms. Have At least one shutter blade and a predetermined distance adjacent to the shutter base plate So that it does not cover the opening for the optical path The long hole Overturn In this way, the shielding plate is disposed in the blade chamber and has at least one long hole in a region not facing the long hole, and is rotatably attached to the shutter base plate outside the blade chamber. At least one driving member for operating the shutter blade; It is connected to the drive member via a connecting member that operates in the elongated hole of the shutter base plate. Between the shutter base plate and the shielding plate, the shutter base plate is rotatably attached. With A drive pin that is connected to one of the arms through the elongated hole of the shield plate; Have And an intermediary member.
[0009]
In that case, it is advantageous in terms of the configuration of the shutter if the shielding plate is substantially the same size as the shutter base plate and has an opening for the photographing optical path. Further, it is more effective if the shielding plate is provided with an adhesive sheet having an adhesive surface facing the shutter base plate on at least a part of the surface facing the shutter base plate.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the illustrated examples. The present embodiment is a focal plane shutter having two shutter blades that can be applied to both a digital still camera and a silver salt camera. FIG. 1 is a plan view of the embodiment viewed from the subject side in a state in which the focal plane shutter of the embodiment is incorporated in the camera, and shows a state immediately after the exposure operation ends. FIG. 2 is a cross-sectional view of the main part, and the upper side of the figure is the subject side. Further, FIG. 3 is a plan view of the embodiment showing about half of the left side when viewed in the same manner as in FIG. 1, and shows a set state. In the description of this embodiment, the front side means the subject side, and the back side means the photographer side.
[0011]
First, the configuration of the embodiment will be described. In FIG. 1, a photographing optical path opening 1 a having a rectangular shape is formed in a substantially central portion of the shutter base plate 1. Further, as is conventionally known, an intermediate plate 2 and an auxiliary base plate 3 are disposed in order on the back side of the shutter base plate 1 with a predetermined interval between the shutter base plate 1 and the intermediate plate 2. The blade chamber of the rear blade is configured, and the blade chamber of the leading blade is configured between the intermediate plate 2 and the auxiliary base plate 3, but in the case of the present embodiment, in particular, the shutter base plate 1 and the intermediate plate 2 A shielding plate 4 is disposed between the two. In the case of the present embodiment, the outer shape of the intermediate plate 2, the auxiliary ground plate 3, and the shielding plate 4 is exactly the same as shown by the broken line in FIG. In these substantially central portions, openings 2a, 3a, 4a for photographing optical paths that are slightly larger than the opening 1a of the shutter base plate 1 are formed. Therefore, in the case of the present embodiment, the opening 1a regulates the imaging light passage area.
[0012]
Further, the intermediate plate 2, the auxiliary ground plate 3, and the shielding plate 4 are all attached to shafts 1 b, 1 c, 1 d, and 1 e erected on the back side of the four corners of the shutter ground plate 1. And the attachment structure is the same at all four locations, and the attachment structure for the shaft 1b is shown in FIG. That is, the cylindrical spacer 5 is fitted to the shaft 1b after the hole of the shielding plate 4 is fitted, and the cylindrical spacer 6 is then fitted after the hole of the intermediate plate 2 is fitted. The screw 7 is screwed into the screw hole formed at the tip of the shaft 1b after the hole of the auxiliary base plate 3 is fitted and finally the hole is formed. Therefore, the interval between the shutter base plate 1 and the shielding plate 4 is regulated by the spacer 1b-1 formed at the base of the shaft 1b, and the interval between the shielding plate 4 and the intermediate plate 2 is regulated by the spacer 5, The interval between the auxiliary ground planes 3 is regulated by the spacer 6. Thus, in this embodiment, since the shielding plate 4 happens to have the same shape as the intermediate plate 2, it is as if the blade chamber of the rear blade is configured by the shielding plate 4 and the intermediate plate 2. It is like that.
[0013]
As shown in FIGS. 1 and 3, two arc-shaped long holes 1f and 1g are formed as through holes in the left region of the opening 1a. Although omitted in FIG. 1 for the sake of clarity, the well-known butyl rubber cushioning members 8 and 9 having a C-shaped planar shape are attached to the upper ends of the long holes 1f and 1g. Yes. The shutter base plate 1 has a shaft on the surface side. 1h In addition to the shafts 1b, 1c, 1d, and 1e, shafts 1i and 1j are erected on the back side. Furthermore, although not shown because it is well known, a plurality of shafts are erected on the surface side of the shutter base plate 1 in the left region of the opening 1a, and a support plate and a printed wiring board are provided at their tips. Are attached so as to be parallel to the shutter base plate 1. Of the support plate and the printed wiring board, a well-known front blade electromagnet and rear blade electromagnet (not shown) are attached to the support plate disposed on the shutter base plate 1 side.
[0014]
The leading blade driving member 10 and the trailing blade driving member 11 are both made of synthetic resin, and are supported by the shutter base plate 1 and the support plate (not shown) so that the respective rotation shafts 10a and 11a can rotate. Has been. And since the support structure is the same, the case of the drive member 11 for rear blades is demonstrated using FIG. A hole is formed in the shutter base plate 1 in advance, and a bearing member 12 is fixed thereto. On the other hand, the rear blade drive member 11 has shaft portions 11b and 11c formed at both ends of the rotating shaft 11a, and the shaft portion 11b at the upper end is rotatably fitted in the hole formed in the support plate. The shaft portion 11c at the lower end is rotatably fitted in the hollow portion of the bearing member 12. At this time, the shaft portion 11 c at the lower end passes through the holes 4 b and 2 b of the shielding plate 4 and the intermediate plate 2 and is inserted into the hole 3 b of the auxiliary ground plate 3. The shaft portions 10b and 10c formed on the rotating shaft 10a of the leading blade drive member 10 are similar to the shaft portions 11b and 11c formed on the rotating shaft 11a of the trailing blade drive member 11. 1 and shown in FIG.
[0015]
Therefore, other configurations of the leading blade driving member 10 and the trailing blade driving member 11 will be described with reference to FIGS. 1 and 3. First, the front blade drive member 10 has a roller 13 and an iron piece member 14 attached to the front surface side, and the iron piece member 14 can be adsorbed by the above-described front blade electromagnet (not shown) in the state of FIG. It is like that. Although not shown, the leading blade driving member 10 is urged to rotate counterclockwise by a well-known leading blade driving spring. On the other hand, the rear blade drive member 11 has a cylindrical driven portion 11d formed on the back side, and an iron piece member 15 is attached to the front side. The iron piece member 15 can be attracted to the above-described electromagnet for the rear blade (not shown) in the state shown in FIG. Although not shown, the rear blade drive member 11 is urged to rotate counterclockwise by a known rear blade drive spring.
[0016]
A set member 16 is rotatably attached to the shaft 1h provided upright on the surface side of the shutter base plate 1. This set member 16 is not shown in figure, the pushing part 16a which pushes the roller 13 attached to the driving member 10 for front blades, the pushing part 16b which pushes the to-be-driven part 11d of the driving member 11 for rear blades 1 has a driven portion 16c pressed by a member on the camera body side, and is biased to rotate clockwise by a return spring (not shown). FIG. 1 illustrates the rotation. It shows a state where it is blocked by stop means not shown. Hereinafter, for the set member 16, this position is referred to as an initial position.
[0017]
Next, the structure of the member arrange | positioned at the back side of the shutter base plate 1 is demonstrated. First, the points that have not been described so far will be described for the intermediate plate 2, the auxiliary ground plate 3, and the shielding plate 4. The long holes 1f and 1g formed in the shutter base plate 1 are formed in an arc shape centering on the positions of the rotation shafts 10a and 11a of the drive members 10 and 11, respectively. Arc-shaped long holes 2c and 2d having small radii around the positions of the rotary shafts 10a and 11a are formed. In addition, the auxiliary base plate 3 is formed with an arc-shaped long hole 3c centered on the position of the rotating shaft 10a with the same radius as the long hole 2c. Further, arc-shaped long holes 4c and 4d centering on the positions of the rotary shafts 10a and 11a are formed in the shielding plate 4 with the same radius as the long holes 2c and 2d. Further, although not clearly shown in the drawing and not provided with a reference numeral, in the case of the present embodiment, an extremely thin adhesive is provided on the shutter base plate 1 side of the shielding plate 4 with the adhesive surface being the shutter base plate 1 side. The sheet is affixed entirely.
[0018]
Mediating members 17 and 18 are disposed between the shutter base plate 1 and the shielding plate 4. One end of each of the mediating members 17 and 18 is rotatably attached to the shaft portions 10c and 11c of the drive members 10 and 11, and the other end is operated in the long holes 1f and 1g. The connecting members 19 and 20 are connected to the driving members 10 and 11. Therefore, the mediating members 17 and 18 can be rotated at the same angle in the same direction by the drive members 10 and 11. The mediating members 17 and 18 are provided with drive pins 17a and 18a. The drive pins 17a pass through the long holes 4c and 2c, and their tips are inserted into the long holes 3c of the auxiliary base plate 3. As shown in FIG. 2, the drive pin 18a passes through the long holes 4d and 2d, and the tip thereof is in the blade chamber of the leading blade. As shown in FIG. 2, in this embodiment, the connecting member 20 is fixed to both the rear blade drive member 11 and the mediating member 18 by caulking. For example, one end is for the rear blade. Although fixed to the drive member 11, the other end Intermediary member 18 The connecting member 20 may be formed integrally with the rear blade drive member 11 in such a case.
[0019]
Next, although the structure of a front blade | wing and a rear blade | wing is demonstrated, illustration of a front blade | wing is abbreviate | omitted in FIG. First, the leading blade includes an arm 21 rotatably attached to the shaft portion 10c of the leading blade driving member 10, an arm 22 rotatably attached to the shaft 1i of the shutter base plate 1, and the two arms 21 thereof. , 22 and four blades 23, 24, 25, 26 that are pivotally supported in order toward the tip end portion, and the blade 26 pivotally supported at the forefront is a slit-forming blade. The arm 21 is formed with a long hole 21a (not shown in FIG. 1), and the drive pin 17a is fitted therein.
[0020]
On the other hand, the rear blade includes an arm 27 rotatably attached to the shaft portion 11c of the rear blade drive member 11, an arm 28 rotatably attached to the shaft 1j of the shutter base plate 1, and the two arms 27. , 28 and four blades 29, 30, 31, 32 that are pivotally supported in order toward the tip end portion, and the blade 32 pivotally supported at the forefront is a slit forming blade. The arm 27 is formed with a long hole 27a (not shown in FIG. 1), and the drive pin 18a is fitted therein.
[0021]
Next, the operation of this embodiment will be described. FIG. 1 shows a stop state immediately after the exposure operation is finished. At this time, the leading blade driving member 10 rotates counterclockwise by the biasing force of the leading blade driving spring (not shown), and the connecting member 19 comes into contact with the buffer member 8 (see FIG. 3). State is maintained. At this time, the four blades 23 to 26 of the leading blade are overlapped and stored in the upper position of the opening 1a. On the other hand, the rear blade drive member 11 is rotated counterclockwise by the biasing force of the rear blade drive spring (not shown), and the connecting member 20 contacts the buffer member 9 (see FIG. 3). Is maintained. At this time, the four blades 29 to 32 of the rear blade are deployed to cover the opening 1a.
[0022]
In the setting operation of this embodiment, a member on the camera main body (not shown) pushes the driven portion 16c of the setting member 16, and the setting member 16 is counterclockwise against a biasing force of a return spring (not shown). This is done by rotating to. When the set member 16 starts to rotate counterclockwise, first, the pushing portion 16a pushes the roller 13 while rotating the roller 13, and the leading blade driving member 10 is biased by a leading blade driving spring (not shown). Rotate clockwise against Accordingly, the mediating member 17 also rotates in the clockwise direction, so that the drive pin 17a rotates the arm 21 in the clockwise direction. Therefore, the four blades 23 to 26 of the leading blade move downward while reducing the overlap between adjacent blades.
[0023]
When the leading blade slit forming blade 26 overlaps the trailing blade slit forming blade 32 by a predetermined amount, the pushing portion 16b of the set member 16 starts to push the pushed portion 11d of the trailing blade driving member 11, and thereafter The rear blade drive member 11 is also rotated clockwise against the urging force of a rear blade drive spring (not shown). As a result, the mediating member 18 also rotates in the clockwise direction, so that the drive pin 18a rotates the arm 27 in the clockwise direction, and the four blades 29 to 32 of the rear blades overlap each other. Move downward while increasing.
[0024]
The leading blade driving member 10 and the trailing blade driving member 11 are thus rotated clockwise against the urging force of each driving spring, but the rotation of the set member 16 is caused by the trailing blade. The four blades 29 to 32 are superimposed and stored in the lower position of the opening 1a, and the four blades 23 to 26 of the leading blade are deployed to completely cover the opening 1a, and each The iron piece members 14 and 15 attached to the drive members 10 and 11 are stopped at a stage where they reliably contact the iron cores of the leading blade electromagnet and the trailing blade electromagnet which are not shown. FIG. 3 shows a completed state of the set operation thus performed.
[0025]
Thereafter, when the release button of the camera is pressed at the time of photographing, first, the leading blade electromagnet and the trailing blade electromagnet are energized, and the iron piece members 14 attached to the leading blade driving member 10 and the trailing blade drive member 11, 15 is held by suction. Next, the camera body member (not shown) releases the pressing force of the set member 16 against the driven portion 16c, so that the set member 16 is rotated clockwise by the biasing force of the return spring (not shown). It will be rotated. When the pressing portions 16a and 16b of the set member 16 are separated from the roller 13 of the leading blade driving member 10 and the driven portion 11d of the trailing blade driving member 11, the driving members 10 and 11 are exposed. Start waiting. The set member 16 continues to rotate thereafter, returns to the initial position shown in FIG. 1, and stops.
[0026]
Thereafter, the current supply to the leading blade electromagnet is first cut off, and the power supply to the trailing blade electromagnet is cut off after a predetermined time. Therefore, first, when the energization to the leading blade electromagnet is cut off, the suction force to the iron piece member 14 of the leading blade driving member 10 is lost, and the leading blade driving member 10 is driven by a leading blade driving (not shown). It is rapidly rotated counterclockwise by the biasing force of the spring. Therefore, since the drive pin 17a of the mediating member 17 rotates the arm 21 counterclockwise, the four blades 23 to 26 of the leading blade move upward while increasing the overlapping amount of the adjacent blades, forming a slit. The opening 1 a is opened by the lower edge of the blade 26.
[0027]
Next, when the energization to the rear blade electromagnet is cut off and the attractive force to the iron piece member 15 is lost, the rear blade drive member 11 rapidly turns counterclockwise by the biasing force of the rear blade drive spring (not shown). To be rotated. As a result, the drive pin 18a of the mediating member 18 rotates the arm 27 counterclockwise, so that the four blades 29 to 32 of the rear blade move upward while reducing the overlapping amount of adjacent blades, The opening 1 a is covered with the upper edge of the slit forming blade 32. Therefore, thereafter, the exposure surface is continuously exposed by the slit formed between the two slit forming blades 26 and 32.
[0028]
At the final stage of such an exposure operation, the leading blade drive member 10 stops after the connecting member 19 abuts against the buffer member 8 and is braked by compressing the buffer member 8. As a result, the four blades 23 to 26 of the leading blade are in a retracted state at a position above the opening 1a and are stationary. In this way, immediately after the connecting member 19 comes into contact with the buffer member 8, the connecting member 20 comes into contact with the buffer member 9 and is braked in the same manner and then stops. As a result, the four blades 29 to 32 of the rear blade are still in a state of completely covering the opening 1a, but this state is the state shown in FIG.
[0029]
By the way, in the case of the present embodiment, not all members are shown, but actually, in the region on the surface side of the shutter base plate 1 and on the left side of the opening portion 1a, a lot of shutter opening / closing mechanisms are configured. These members are attached. A considerable number of these members are displaced or temporarily deformed in relation to the above operation. In the case of a single-lens reflex camera, a mirror box is disposed on the surface side of the shutter base plate 1 so as to surround the opening 1a. The drive mechanism is located outside the mirror box on the left side of the mirror box (shutter opening / closing mechanism). May be attached to the wall surface on the side where the Therefore, every time photographing is performed, minute wear powder that is difficult to see is generated from the members of these mechanisms.
[0030]
For example, even in the case of the members shown in the present embodiment, the leading blade driving member 10, the trailing blade driving member 11, and the set member 16 are rotating members. 12), and in the case of the set member 16, the wear powder is generated between the shaft 1h. Similarly, in the case of the roller 13, wear powder is generated between the roller 13 and the rotating shaft. Further, when the pushing portion 16b of the set member 16 pushes the pushed portion 11d of the trailing blade drive member 11, a cam action works, so that wear powder is generated. Further, when the connecting members 19 and 20 come into contact with the buffer members 8 and 9, since the buffer members 8 and 9 are C-shaped, the connecting members 19 and 20 compress the buffer members 8 and 9. At this time, wear powder is generated. And since the buffer members 8 and 9 are comparatively soft, the generated abrasion powder contains a thing larger than the abrasion powder generated from others.
[0031]
As described above, a mirror box is usually arranged around the opening 1a. For this reason, the wear powder generated from the shutter opening / closing mechanism and the mirror driving mechanism has a relatively low rate of entering the blade chamber from the opening 1a. Therefore, most of them try to enter from the long holes 1f and 1g. In addition, some of the wear powder that tries to enter in such a way may fly directly when generated, but once adhered to the surfaces of the shutter base plate 1 and other members, it is caused by vibrations or the like during subsequent photographing. Some will come. For such a situation, conventionally, the shielding plate 4 as in the present embodiment has not been arranged, so that all of the abrasion powder entering through the long holes 1f and 1g directly enters the blade chamber. It was. The wear powder that entered the blade chamber adhered to the shutter blade and then entered further into the exposure surface.
[0032]
On the other hand, in the case of the present embodiment, the shielding plate 4 covers the long holes 1f and 1g as if they are closed from the inside of the blade chamber, so that the air flow is restricted and wear powder enters. Is suppressed. In addition, particularly in the case of the present embodiment, the adhesive sheet is attached to the surface of the shielding plate 4 on the side of the shutter base plate 1 so that the adhesive surface is the shutter base plate 1 side. Even if it passes, most of it is captured by the pressure-sensitive adhesive sheet and extremely prevents entry into the space where the rear blades are arranged. Therefore, in the case of the present embodiment, the wear powder generated from the shutter opening / closing mechanism and the mirror driving mechanism outside the blade chamber hardly reaches the exposure surface.
[0033]
In the case of the present embodiment, the shape of the shielding plate 4 is the same as that of the intermediate plate 2 and is close in size to the shutter base plate 1. Therefore, the shaft that is erected on the shutter base plate 1 in the past is used. The shielding board 4 is attached using it. Therefore, the mounting configuration of the shielding plate 4 is suitable. In addition, this configuration has an advantage that the area for capturing the wear powder is increased, and the capturing function can be maintained for a long time. However, the present invention is not limited to such a configuration, and the shielding plate 4 may be, for example, the size of the region on the left side of the opening 4a, and the adhesive sheet may not be attached. Even if it is affixed, it does not matter that it is affixed only to the peripheral part centering on the surface facing the long holes 1f, 1g, rather than affixing to the entire surface of the shielding plate 4.
[0034]
In the above embodiment, the driving members 10 and 11 are actuated by a driving spring (not shown) at the time of photographing. However, the present invention is also applicable to those actuated by a motor. Moreover, although said Example is equipped with two shutter blade | wings, this invention is using the intermediate | middle board 2 among the three board members (shutter base plate 1, intermediate plate 2, auxiliary base plate 3) for blade chamber structure. Without being provided, it can also be applied to a focal plane shutter having one shutter blade in one blade chamber. Further, when the focal plane shutter is incorporated in a digital still camera, the auxiliary ground plate 3 in this embodiment may be mounted on the subject side and the shutter ground plate 1 may be on the photographer side. It is applicable also to what made it.
[0035]
【The invention's effect】
As described above, in the present invention, in order to connect the driving member attached to the shutter base plate outside the blade chamber and the shutter blade arranged in the blade chamber, an arc-shaped long hole is formed in the shutter base plate. In the focal plane shutter for a camera, an intermediate member connected to the drive member and a shielding plate are arranged in the blade chamber, and the oblong hole is covered from the blade chamber by the shielding plate, and provided in the intermediate member. Since the shutter blades are actuated by the driven pins, it is possible to suitably suppress wear powder generated by the operation of the shutter opening / closing mechanism or the like outside the vane chamber and passing toward the exposure surface. Further, it is more preferable to attach an adhesive sheet to the surface of the shielding plate on the shutter base plate side so that the adhesive surface is on the shutter base plate side.
[Brief description of the drawings]
FIG. 1 is a plan view of an embodiment viewed from a subject side in a state where it is incorporated in a camera, and shows a state immediately after the end of an exposure operation.
FIG. 2 is a cross-sectional view of the main part of FIG.
FIG. 3 is a plan view of an embodiment showing about half of the left side when viewed in the same manner as in FIG. 1, and shows a set state.
[Explanation of symbols]
1 Shutter base plate
1a, 2a, 3a, 4a opening
1b, 1c, 1d, 1e, 1h, 1i, 1j axes
1b-1 spacer
1f, 1g, 2c, 2d, 3c, 4c, 4d, 12a, 27a
2 Intermediate plate
2b, 3b, 4b hole
3 Auxiliary ground plane
4 Shield plate
5,6 Spacer
7 screw
8,9 cushioning member
10 Leading blade drive member
10a, 11a Rotating shaft
10b, 10c, 11b, 11c Shaft
11 Rear blade drive member
11d, 16c Driven part
12 Bearing members
13 Laura
14,15 Shingles
16 Set members
16a, 16b Pushing part
17, 18 Mediation member
17a, 18a Drive pin
19, 20 connecting member
21, 22, 27, 28 arms
23, 24, 25, 26, 29, 30, 31, 32 blades

Claims (3)

A shutter base plate having a substantially square-shaped opening for the photographing optical path and having at least one long hole in one side region of the opening, and an opening for the photographing optical path At least one plate member attached to the shutter base plate to form at least one blade chamber, a plurality of arms disposed in the blade chamber and pivotally attached to the shutter base plate, and each of the arms At least one shutter blade that is pivotally supported by the shutter, and at a predetermined interval adjacent to the shutter base plate so as not to cover the opening for the photographing optical path. a shielding plate having at least one elongated hole in a region which is not the elongated hole and the counter is arranged in the vane chamber in the long hole covering Migihitsuji, times the shutter base plate in the blade outdoor And at least one drive member operating the shutter blade by the possibility mounted with which the rotation, and the shutter base plate the slot the shutter base is connected to the driving member via a connecting member operating within plate An intermediate member having a drive pin that is rotatably attached to the shutter base plate between the shield plate and that is connected to one of the arms through the long hole of the shield plate; A focal plane shutter for a camera. 2. The focal plane shutter for a camera according to claim 1, wherein the shielding plate has substantially the same size as the shutter base plate and has an opening for a photographing optical path. 3. The adhesive sheet according to claim 1, wherein the shielding plate is provided with an adhesive sheet having an adhesive surface facing the shutter base plate at least at a part of the surface facing the shutter base plate. Focal plane shutter for cameras.

Images