JP2001343676A - Shutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a shutter device in such a way as being suitable for high speed actuation by keeping actuation resistance and inertia small while securing the superposed amount of blades for shielding light without complicating the structure of a blade unit. SOLUTION: This shutter device is provided with a base plate where a shutter aperture is formed, 1st and 2nd arm members turnably supported on the base plate, and a plurality of shutter blades supported by the 1st and the 2nd arm members. A plurality of connection parts to be connected with the shutter blades are formed on the 1st and the 2nd arm members. The connection parts of the 1st and the 2nd arm members are arranged so that one of the connection parts formed on the 2nd arm member may be positioned between the connection part formed on the 1st arm member and the turning center of the 1st arm member when the shutter blades open the shutter aperture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split blade type shutter device.

[0002]

2. Description of the Related Art Conventionally, a (common) mechanism used in a focal plane shutter of a type in which a plurality of divided blade groups are rotatably supported by a parallel link mechanism composed of two arms is an arm. There is a long arm type and a short arm type depending on the difference in the blade group holding means.

Here, a so-called vertical running focal plane shutter for moving a blade group up and down will be described.

First, as shown in the invention described in Japanese Utility Model Publication No. 35-29651, the long arm type has a blade group on the opposite side of the rotatable backbone of the arm across the shutter opening. The arm is rotatably held. Therefore, the arm becomes longer than the width of the shutter opening. In the long arm type, since the angle of rotation of the arm required for opening and closing the shutter opening by the blade group can be small, the amount of displacement in the direction perpendicular to the traveling direction of the blade group due to the opening and closing operation is small, and it is necessary to reduce the width of the shutter. This is advantageous. However, when the number of blade groups that can be held by two arms is three or more, there are disadvantages that the structure becomes complicated and that the inertia of the blade unit becomes large due to the long arm, which is disadvantageous for high-speed traveling. For this reason, with the recent increase in the speed of the exposure time of the shutter and the increase of the speed of the flash light emission synchronization time, the long arm type, which is not suitable for the high speed, has been used.

Therefore, the short arm type which has been considered to solve the disadvantage of the long arm type is disadvantageous for miniaturization of the lateral width, but without interposing the shutter opening, the short side of the arm close to the main part of the arm. A large number of blade groups are configured to be rotatably held by two arms near the same side of the shutter opening.

In order to further reduce the inertia, it is desirable that the length of the arm be as short as possible. As a conventional example of the short arm type, FIGS. 19 and 20 (FIG. 19 shows a traveling ready state,
FIG. 20 shows a state in which the traveling is completed. It is a substrate (101) having a shutter opening (101a).
(Shutter base plate), the first curtain consists of five blades,
A first arm (106) and a second arm (107) whose backbones are rotatably supported on shafts (101d, 101e).
The slit forming blade (102) formed to open and close the shutter opening and the covering blade (103, 104, 1)
05, 105 ') to rotate freely.
a, 108b, 108c, 108d, 108e, 109
a, 109b, 109c, 109d, 109e) to form parallel links. The rear curtain is composed of four blades, and the shutter opening is opened and closed by a first arm (114) and a second arm (115), which are also rotatably supported on the main body by shafts (101f, 101g). Slit forming blade (110) and the covering blade (1)
11, 112, 113) so as to freely rotate the blades (116 a, 116 b, 116 c, 116 d, 117).
a, 117b, 117c, 117d) to form parallel links. In both the front curtain and the rear curtain, the arrangement of the blade caulking dowels is straightforward so as to draw a gentle arc in order, and the first arm and the second arm are mutually overlapped with the blade unit overlapping the shutter opening. It was lining up closely. (Hereinafter referred to as a first conventional example)

Further, from the viewpoint that it is difficult to reduce the size of the parallel link mechanism composed of two arms, the third link (and the
The following has been proposed as an attempt to reduce the size by adding an auxiliary arm of the present invention.

In the device described in Japanese Utility Model Publication No. Hei 6-26896, at the time of superposition, the support portions of the first and second arms for supporting the slit forming blades are accommodated in a storage portion area existing between the finder and the opening window. The outer dimension of the focal plane shutter in the left-right direction is reduced by setting the third arm supporting the other covering blade group outside the area.

In order to dispose the three arms in a small space, each arm is thinned, and the first arm and the third arm are overlapped with each other while the blade unit opens the shutter opening. The base rotation center of the third arm enters between the base rotation center of the third arm and the caulking dowel of the third covering blade, and the first rotation center of the third arm and the caulking dove of the third covering blade. The swaging dowel of the third covering blade on the arm is inserted. (Hereinafter referred to as a second conventional example)

The invention described in Japanese Utility Model Publication No. 6-26897 discloses a method in which one of the two main arms supporting the slit forming blade is connected to and supported by one of the other blades. The other supporting portion is connected and supported to the other main arm and the auxiliary arm, so that the focal plane shutter is reduced in size and improved in durability. (Hereinafter, this is referred to as a third conventional example.)

Further, the invention described in Utility Model Registration No. 2501747 includes a slit forming blade operated by a first parallel link mechanism, and a cover blade operated by a second parallel link mechanism. The connection distance on the slit forming blade of the second parallel link is longer than the connection distance on the cover blade of the second parallel link to maintain the parallelism of the slit forming blade of the focal plane shutter, and from the shutter opening to the backbone side of each parallel link. This is to reduce the space. (Hereinafter referred to as a fourth conventional example)

[0012] Further, as another device which is miniaturized by another configuration, a device described in Japanese Utility Model Publication No. 57-57367 discloses a slit forming blade and a cover blade operated by a parallel link mechanism comprising two arms. In order to support one end of the first cover blade following the slit forming blade, a blade support member rotatably supported on one arm is provided on one arm, and design freedom of a support position of the first cover blade is provided. This is to prevent interference between the blade and the support position when the size is increased and the size is reduced. Then, in a superposed state where the blade unit opens the shutter opening, the support portion of the first cover blade enters between the shaft support point on the arm of the blade support member and the shaft support point on the arm of the second cover blade. It has become. (Hereinafter referred to as a fifth conventional example)

[0013]

Generally, when the size of the shutter is reduced (especially the width of the shutter is reduced), the number of connecting portions between the arm and the blade is reduced by reducing the number of divided blade groups. Thus, the area occupied by the connecting portion is reduced, which is advantageous for miniaturization. On the other hand, when the number of blade groups is reduced, the amount of overlap between the blades for shielding the shutter opening of a predetermined size is reduced, and it becomes difficult to secure the light shielding property.

When the arm length is shortened by downsizing in the first conventional example, the number of front curtain blades is as large as five, and the spacing of the swaging blades is narrowed while the arrangement of the blades is straightened. Since the degree of freedom of the free support position is reduced, interference within the blade unit (for example, in FIG. 20, the outer periphery of the main body 106b of the first arm 106 and the blade caulking
09e around the second arm 107 and the outer periphery of the covering blade 105 ', the outer periphery of the first arm 106 around the blade caulking dowel 108e and the second arm 107 and the covering blades 104 and 105 around the blade caulking dowels 109c and 109d. When the arm length is shortened for the parallel link, if the length of the arm of the parallel link is shorter than the fixed length of the blade, the blade cannot be increased by a predetermined distance. In order to move the blade, it is necessary to increase the rotation angle of the arm.) In addition, it is difficult to maintain the amount of overlap between the slit forming blade and the cover blade when the blade closing the shutter opening is deployed. Could not be downsized.

On the other hand, when the rear curtain of the four-blade configuration is commonly used for the front curtain, as shown in FIG. 20, when the rear curtain is deployed, the overlap amount of each blade is about 2 mm, which is small. Even if the width of each blade is increased within the range of the blade storage space in the superimposed state in which the front curtain opens the shutter opening, as in the case of the five-bladed blade described above, the intervals of the blade caulking dowels are closely aligned with the arrangement of the blades being straightened, Due to the restriction on the arrangement of the blade caulking dowels, the degree of freedom of the rotatable support position of the cover blade is reduced, and interference within the blade unit (for example, in FIG. 19, the first arm 1
14 and the second arm 115 around the blade caulking dowel 117d and the outer periphery of the covering blade 113d, and the first arm 114 around the blade caulking dowel 116d.
Arm 1 around the outer periphery of the blade and around the caulking dowel 117c
15 and interference with the outer periphery of the covering blade 112), and it can be spread only about 1 mm further to the side opposite to the running direction of the blade, so that the desired amount of blade overlap of 4 mm cannot be secured. . (See below for a description of the placement of the wing caulking dowels.)

The second conventional example (Japanese Utility Model Publication No. 6-26896)
No. 3), a third arm for supporting the covering blade group is added, so that the structure becomes more complicated and the operating resistance increases compared to a general parallel link mechanism having two arms as in the first conventional example. There was a disadvantage that the inertia of the blade unit was increased. In addition, since three arms are arranged in a small space, each arm becomes thin, and the strength of the arms themselves is weak. In addition, at the time of superposition, since the support portions of the first and second arms that support the slit forming blades are accommodated in the storage region existing between the finder and the opening window, the connection distance of the parallel link on the slit forming blades is reduced. However, it is difficult to maintain the parallelism of the exposure slit.

The third conventional example (Japanese Utility Model Publication No. 6-26897)
In the second conventional example, a third arm (auxiliary arm) for supporting the covering blade group is added similarly to the second conventional example, so that a general two-arm parallel link mechanism as in the first conventional example is used. In comparison, the structure becomes complicated, the operating resistance increases, and the inertia of the blade unit increases.
Although the number of arms is increased in order to distribute the load to the arms, three (or more) arms are arranged in the space reduced by the miniaturization, so that each arm becomes thin, and eventually the arms become thin. There is a disadvantage that the strength of the arm itself is reduced.

In the fourth conventional example (utility model registration
No. 2501747), one blade unit is provided with two parallel link mechanisms, and a third arm (and further a fourth arm) for supporting the cover blade group is added. As compared with a general parallel link mechanism using an arm, the structure is complicated, the operating resistance is increased, and the inertia of the blade unit is increased. Further, since three (or four) arms are arranged in the space reduced by the miniaturization, each arm becomes thin, and there is a disadvantage that the strength of the arm itself is weak.

The fifth conventional example (Japanese Utility Model Publication No. 57-57367)
In (2), since the weight of the blade supporting member and the blade is loaded on the supporting portion on the arm supporting the blade supporting member, there is a disadvantage that the durability of the supporting portion is particularly poor. Further, since the blade supporting member is added, the structure becomes more complicated than that of the general parallel link mechanism having two arms as in the first conventional example, the operating resistance increases, and the inertia of the blade unit increases. There was an inconvenience.

Therefore, the second to fifth conventional examples are disadvantageous for high-speed running of the blade unit. For example, in the case of a camera, an exposure time shorter than 1/4000 second or an exposure time shorter than 1/200 second is realized. It was difficult to achieve the flash synchronization time. Also, since the shutter charge energy required to achieve the same curtain speed increases, the size of the camera is increased, and it is inconvenient to increase the frame speed during continuous shooting.

An object of the invention of the present application is to reduce the size, in particular, to reduce the size in the direction perpendicular to the blade traveling direction, secure the overlapping amount of the blades for light shielding, to reduce the inertia of the blade unit, and to improve the operating efficiency. It is another object of the present invention to provide a shutter device suitable for high-speed operation.

[0022]

The invention according to claim 1 is
A substrate on which a shutter opening is formed; first and second arm members rotatably supported by the substrate;
And a plurality of shutter blades supported by the second arm member, wherein the first and second arm members each have a plurality of connection portions with the shutter blade, and the shutter blade is provided with the shutter blade. When opening the opening, one of the connecting portions formed on the second arm member is positioned between the connecting portion formed on the first arm member and the center of rotation of the first arm member. In this case, a connecting portion of the first and second arm members is arranged.

According to a second aspect of the present invention, there is provided a substrate on which a shutter opening is formed, and a first substrate rotatably supported by the substrate.
And a second arm member, and a plurality of shutter blades supported by the first and second arm members, wherein the first and second arm members each have a connection portion with the shutter blade. When the shutter blades open the shutter opening, a plurality of connecting portions formed in the second arm member are formed at positions closest to the center of rotation of the second arm member. A connection portion to be connected is located between the rotation center of the first arm member and the connection portion of the first arm member formed closest to the rotation center of the first arm member. As described above, the connection part of the first and second arm members is arranged.

According to a third aspect of the present invention, there is provided a substrate having a shutter opening formed therein, and a first substrate rotatably supported by the substrate.
And a second arm member, and a plurality of shutter blades supported by the first and second arm members, wherein the first and second arm members each have a connection portion with the shutter blade. Are formed, and when the shutter blade opens the shutter opening, one of the joining portions formed on the first arm member is connected between two connecting portions formed on the second arm member. A connection portion of the first and second arm members is arranged so as to be located.

According to a fourth aspect of the present invention, there is provided a substrate on which a shutter opening is formed, and a first substrate rotatably supported by the substrate.
And a second arm member, and a plurality of shutter blades supported by the first and second arm members, wherein the first and second arm members each have a connection portion with the shutter blade. Are formed, and when the shutter blade opens the shutter opening, the connection portion of the first arm member formed closest to the rotation center of the first arm member is connected to the second arm member. A connection portion of the second arm member formed at a position second closest to the rotation center of the arm member and a second connection portion formed at a position third closest to the rotation center of the second arm member; The connection part of the first and second arm members is arranged so as to be located between the connection part of the arm member and the connection part of the arm member.

According to a fifth aspect of the present invention, there is provided a substrate on which a shutter opening is formed, and a first substrate rotatably supported by the substrate.
And a second arm member, and a plurality of shutter blades supported by the first and second arm members, wherein the first and second arm members each have a connection portion with the shutter blade. Are formed, and when the shutter blade opens the shutter opening, the rotation center of the first arm member is positioned between two connection portions formed on the second arm member. , A connecting portion of the second arm member is arranged.

According to a sixth aspect of the present invention, there is provided a substrate on which a shutter opening is formed, and a first substrate rotatably supported by the substrate.
And a second arm member, and a plurality of shutter blades supported by the first and second arm members, wherein the first and second arm members each have a connection portion with the shutter blade. Are formed, and when the shutter blade opens the shutter opening, the rotation center of the first arm member is formed at a position closest to the rotation center of the second arm member. The second arm member so as to be located between a connection portion of the second arm member and a connection portion of the second arm member formed at a position second closest to the rotation center of the second arm member. It is characterized in that a connecting portion of the member is arranged.

According to a seventh aspect of the present invention, there is provided a substrate on which a shutter opening is formed, and a first substrate rotatably supported by the substrate.
And a second arm member, and a plurality of shutter blades supported by the first and second arm members, wherein the first and second arm members each have a connection portion with the shutter blade. Are formed, and when the shutter blade opens the shutter opening, a line connecting two connecting portions formed on the first arm member and two connecting portions formed on the second arm member And a connecting portion between the first and second arm members is arranged so that a line connecting the first and second arm members coincides with each other.

The invention according to an eighth aspect is directed to a substrate wherein a shutter opening is formed and a first substrate rotatably supported by the substrate.
And a second arm member, and a plurality of shutter blades supported by the first and second arm members, wherein the first and second arm members each have a connection portion with the shutter blade. Are formed, and when the shutter blade opens the shutter opening, a connection portion of the first arm member formed at a position closest to a rotation center of the first arm member and the first arm A line connecting the connection portion of the first arm member formed at a position closest to the rotation center of the member to the connection portion of the first arm member; and a line formed at a position closest to the rotation center of the second arm member. 2
The first arm member is connected to the first arm member so that a line connecting the second arm member connection portion and the second arm member connection portion formed at a position second closest to the rotation center of the second arm member coincides with each other. And a connection portion for the second arm member.

According to a ninth aspect of the present invention, there is provided a substrate on which a shutter opening is formed, and a first substrate rotatably supported by the substrate.
And a second arm member, and a plurality of shutter blades supported by the first and second arm members, wherein the first and second arm members each have a connection portion with the shutter blade. Are formed, and when the shutter blade opens the shutter opening, the rotation center of the first arm member is formed at a position closest to the rotation center of the second arm member. The second arm member is located between a connection portion of the second arm member and a connection portion of the second arm member formed at a position second closest to the center of rotation of the second arm member. A connecting portion of the second arm member formed at a position second closest to the center of rotation of the first arm member and a position closest to the center of rotation of the first arm member and the center of rotation of the first arm member The first formed in So as to be positioned between the connection portion of the over arm member is characterized in that a connecting portion of the first and second arm members.

According to a tenth aspect of the present invention, there is provided a substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and the first and second arm members. In a shutter device having a plurality of supported shutter blades, a plurality of connection portions with the shutter blades are formed on the first and second arm members, respectively.
When the shutter blade opens the shutter opening,
The center of rotation of the second arm member and the center of rotation of the second arm member, the center of rotation of the first arm member being formed closest to the center of rotation of the second arm member. The first arm is located between the second arm member and the connecting portion formed at the second closest position to the second arm member, and is formed at the position closest to the rotation center of the first arm member. The connecting portion of the member is located at the center of rotation of the second arm member.
Between the connecting portion of the second arm member formed at the position closest to the third position and the connecting portion of the second arm member formed at the position closest to the third position about the center of rotation of the second arm member. The connecting portion of the first and second arm members is arranged so as to be located at a position.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 4 show a focal plane shutter blade unit according to a first embodiment of the present invention. FIG.
FIG. 2 is a front view showing a traveling completed state. FIG. 3 and FIG. 4 are explanatory diagrams of the effect of devising the blade holding position on the arm.

In these figures, reference numeral 1 denotes a substrate having a shutter opening (hereinafter referred to as a shutter base plate), 1a denotes a shutter opening, and 1b denotes a not-shown front curtain driving lever (provides running energy to the front curtain by a spring force or the like. 1c is an elongated hole for escaping the travel trajectory of the drive pin of the rear curtain drive lever (not shown) that imparts travel energy to the rear curtain by a spring force or the like. , 2
Is a leading blade slit forming blade (# 1 blade), 2a is a leading blade slit forming end, 3 to 5 are leading blade covering blades, 3 is a leading blade # 2, 4 is a leading blade # 3, 5 is a leading blade # Called 4.

Reference numeral 6 denotes a first arm for the front curtain, whose base portion 6b is rotatably pivoted around an axis 1d provided on the shutter base plate 1, and is provided with a caulking dowel 8a provided on the distal end side of the arm. The front curtain slit forming blade 2 is rotatably supported on the arm 6. Reference numeral 6a denotes a hole into which a drive pin of a not-shown front-curtain drive lever is fitted. Power is transmitted from a not-shown front-curtain drive lever provided with a rotary shaft coaxially with the shaft 1d through this hole.

Reference numeral 7 denotes a second arm for the front curtain, whose base 7b is rotatably pivoted around a shaft 1e provided on the shutter base plate 1, and is provided with a caulking dowel 9a provided on the tip end side of the arm. The front curtain slit forming blade 2 is rotatably supported on the arm 7. In this manner, a parallel link is formed by the front curtain slit forming blade 2, the first arm 6 and the second arm 7 for the front curtain.

Similarly, among the front curtain covering blades, # 2 blade 3,
The # 3 blade 4 and the # 4 blade 5 are rotatably supported by caulking dowels 8b and 9b, 8c and 9c, 8d and 9d at the intermediate portion between the first arm 6 and the second arm 7 for the front curtain. ,
Form parallel links. The above constitutes the front curtain.
The rear curtain has the same configuration as the front curtain, 10 is a rear curtain slit forming blade, 10a is a rear curtain slit forming end, 11 to 13 are rear curtain covering blades, 11 is a rear blade # 2, and 12 is a rear blade #. 3,
13 is referred to as rear wing # 4.

Reference numeral 14 denotes a first arm for a rear curtain, whose base portion 14b is rotatably pivoted around an axis 1f provided on the shutter base plate 1, and is provided with a caulking dowel 16a provided on the distal end side of the arm. The rear curtain slit forming blade 10 is rotatably supported on the arm 14. Reference numeral 14a denotes a hole into which a drive pin of a rear curtain drive lever (not shown) is fitted, through which power can be transmitted from a rear curtain drive lever (not shown) provided with a rotary shaft coaxially with the shaft 1f.

Numeral 15 denotes a second arm for the rear curtain, whose base 15b is rotatably pivoted around a shaft 1g provided on the shutter base plate 1, and is provided with a caulking dowel 17a provided on the tip end side of the arm. The rear curtain slit forming blade 10 is rotatably supported on the arm 15.

In this manner, the trailing shutter slit forming blade 10
The first arm 14 and the second arm 15 for the rear curtain form a parallel link. Similarly, of the rear curtain covering blades, # 2 blade 11, # 3 blade 12, and # 4 blade 13 are provided at the intermediate portions of the first arm 14 and the second arm 15, respectively, by swaging dowels 16b and 17b, 16c and 17c. , 16d and 1
It is rotatably supported at 7d to form a parallel link. The above constitutes the second curtain.

The length of the arm of the front curtain and the rear curtain is shortened for miniaturization. However, as long as the size of the shutter opening in the blade running direction is constant, the arm length of the parallel link is reduced. If the length is shortened, it is necessary to increase the rotation angle of the arm to move the blade by a predetermined distance.

As described above, when an attempt is made to increase the rotation angle of the arm, when the blades are superimposed on the four-blade unit, the main unit on the first arm 114 as in the first conventional example is displaced. Part 114b and feather caulking dowels 116c, 116d
In contrast, the swaged dowel 117 on the second arm 115
In an arrangement in which b, 117c, and 117d abut, the rotation angle of the arm does not increase, and it is difficult to reduce the size of the shutter.

Therefore, in order to increase the rotation angle of the arm, as shown in FIGS.
b and 14b and feather caulking dowels 8d and 16d,
Blade swaging dowels 9b, 9 on second arms 7 and 15
An arrangement in which c, 9d and 17b, 17c, 17d alternately enter so as not to abut is effective. In particular, in the state shown in FIG.
7c is located between the blade swaging dowel 16d of the first arm 14 and the rotation center 1f of the first arm 14, and in the state shown in FIG.
Arrangement such that the blade swaging dowel 9c of the arm 7 is located between the blade swaging dowel 8d of the first arm 6 and the rotation center 1d of the first arm 6 greatly contributes to downsizing of the shutter device. .

Furthermore, at least two blades (# 3 blades, # 4 blades) 4, 5 and 12, 13 arranged on the side close to the arm trunk portion, the caulking dowels 8c, 9c, 8d, 9d and 1
If 6c, 17c, 16d, and 17d can be arranged as close as possible to and along the lateral end 11 of the outer shape of the shutter base plate, the effect of miniaturization will be great.

As a specific example, in the rear curtain of the first conventional example, the swivel dowels 116c, 116c of the two blades 112, 113 arranged on the side close to the backbone of the arm are not overlapped with the rotation angle of the arm and the blades are superimposed. Since 117c, 116d and 117d are not close to the horizontal end 101l of the outer shape of the shutter base plate and cannot be arranged along the horizontal end 101l, the lateral distance between the blade caulking dowels 116c and 116d (and 117c and 117d) is 3.08 mm. The dimension (lateral dimension) in the direction orthogonal to the blade running direction of the shutter is increased.

From this, it can be easily expected that even if an attempt is made to reduce the size by following the same arrangement relationship of the blade caulking dowels and the like as in the first conventional example, it cannot be made too small.

On the other hand, in the first embodiment, in the state shown in FIG.
However, the respective blade swaging dowels are arranged so as to be located between the blade swaging dowel 16d of the first arm 14 and the rotation center 1f of the first arm 14. In the state shown in FIG. 1, each of the blade caulking dowels 16d of the first arm 14 is arranged between the blade caulking dowel 17c of the second arm 15 and the blade caulking dowel 17b. I have. Furthermore, the center of rotation 1f of the first arm 14 is disposed between the blade swaging dowel 17c and the blade swaging dowel 17d of the second arm 15.

Similarly, in the state shown in FIG. 2, the blade swaging dowel 9c of the second arm 7 is located between the blade swaging dowel 8d of the first arm 6 and the rotation center 1d of the first arm 6. As shown, each caulking dowel is arranged. Further, in the state shown in FIG.
The blade swaging dowel 8d of the second arm 7 is arranged between the blade swaging dowel 9c and the blade swaging dowel 9b of the second arm 7. Furthermore, the center of rotation 1d of the first arm 6 is disposed between the blade caulking dowel 9c of the second arm 7 and the blade caulking dowel 9d.

As described above, by disposing the blade caulking dowels on the first and second arms, the blade caulking dowels 16c and 16c of the first arm 14 in the state shown in FIG.
The line connecting d is the blade caulking dowel 17 of the second arm 15.
It almost coincides with the line connecting c and 17d.

Similarly, in the state shown in FIG. 2, the line connecting the blade caulking dowels 8c and 8d of the first arm 6 is the second
Substantially coincides with a line connecting the blade caulking dowels 9c and 9d of the arm 7 of FIG.

Both the front curtain and the rear curtain are arranged alternately, such as by swaging the blade, so that the rotation angle of the arm can be greatly increased.
2 arranged on the side close to the arm backbone with the blades superposed
4 blades (# 3 blade, # 4 blade) 4,5 and 12,13
Caulking dowels 8c, 9c, 8d, 9d and 16c, 17
Since c, 16d, and 17d can approach the lateral end 11 of the shutter base plate outer shape and can be arranged along the lateral end 11, the lateral distance between the front curtain vanes 8c and 8d (and 9c and 9d) is 0.44 mm, Second-curtain feather caulking dowels 16c and 16d
The horizontal distance of (and 17c and 17d) is 0.77 mm, and considering the overcharged angle up to 4 °, these horizontal distances in the superimposed state of both the front curtain and the rear curtain are almost 0 (zero) mm.
Can be.

Accordingly, it can be seen that the effect of reducing the size in the direction (lateral dimension) perpendicular to the direction of travel of the blades of the shutter is remarkable.

Next, the operation of the above configuration will be described.

In the traveling preparation completion state shown in FIG. 1, the leading shutter drive lever and the trailing shutter drive lever (not shown) are each attracted and held by a time control magnet (not shown).

When the suction of the front curtain time control magnet is first released by the shutter release signal, the front curtain driving spring (not shown) generates a clockwise rotating force on the front curtain driving lever, and the front curtain is driven by the force of the front curtain driving spring (not shown). Rotates the first arm 6 and the second arm 7 clockwise. Along with this, the leading blade slit forming blade 2 and the leading blade covering blades # 2 blade 3, # 3 blade 4,
The # 4 blade 5 has a shutter opening 1
leading edge slit forming ends 2a and # 2 with respect to the long side 1h
While keeping the blades 3, # 3 blades 4, # 4 blades 5 parallel, the shutter opening 1 is moved downward from above the shutter opening 1a.
Move to open a.

In this way, the front curtain moves to the position shown in FIG. 2 so as to open the shutter opening 1a.

After a predetermined period of time corresponding to the set exposure second after the attraction of the front curtain second control magnet is released,
The attraction of the second-curtain time control magnet is released, and the rear curtain is rotated clockwise by the first arm 14 by the force of a rear-curtain drive spring (not shown) that generates clockwise turning power on the rear-curtain drive lever.
And the second arm 15 is rotated. Accordingly, the rear curtain slit forming blade 10 and the rear curtain covering blade # 2 blades 11, #
The three blades 12 and the # 4 blade 13 are operated by a parallel link.
The rear curtain slit forming end 10a and the # 2 blade 11, # 3 blade 12, and # 4 blade 1 with respect to the long side 1h of the shutter opening 1a.
The shutter opening 1a is moved downward from above the shutter opening 1a while keeping the shutter 3 parallel.

In this way, the rear curtain moves to the position shown in FIG. 2 so as to cover the shutter opening 1a, and the exposure ends.

At the time of shutter charging, the front curtain and the rear curtain are moved by a charging mechanism (not shown) without opening the shutter opening 1a with the front curtain being advanced. An operation of turning the curtain drive lever in a counterclockwise direction is performed, and the front curtain and the rear curtain are moved again from the position shown in FIG. 2 to the position shown in FIG.

Assuming that the focal plane shutter according to the first embodiment is mounted on a single-lens reflex camera using a silver halide film of 135 format, the vertical dimension A of the shutter opening 1a is 24.7 mm and the horizontal dimension is 3
6.6mm. Shutter aperture 1a in this format
Since the size of the shutter device is determined, when the size of the shutter device is reduced, the size of the components around the shutter opening 1a is reduced.

Therefore, the dimension from the end face of the shutter opening 1a on the arm trunk side (left side in FIG. 1) to the end face of the shutter base plate 1 on the side supporting the arm trunk (left side in FIG. 1) is B, Let C be the dimension from the end face of the shutter opening 1a on the blade tip side (right side in FIG. 1) to the end face of the shutter base plate 1 on the blade tip side (right side in FIG. 1).

Further, the dimension from the center of rotation of the arm backbone to the center of rotation of the swaging dowel supporting the slit forming blade at the tip of the arm is D, the maximum operating angle of the arm around the center of rotation of the backbone of the arm is θ, and the first arm is Let E be the dimension between the first and second arms of the parallel link formed by the second arm.

Here, points of interest for miniaturization will be described.

The number of blades rotatably supported by the arm The front and rear curtains of the first embodiment each have four blades, whereas the blades of the first conventional example have five blades on the arm. If the camera is supported, the camera will be in the winding-up completed state (a recent built-in camera waits for the next shooting in this state)
A predetermined blade overlap amount necessary for light shielding when the front curtain closes the shutter opening when the blade group is deployed (4 mm as shown in FIG. 1 in the first embodiment, 4 m as shown in FIG. 19 in the first conventional example).
Under the condition of securing m), the width of one blade can be made smaller with five blades.

If so, the larger the number of blade groups, the smaller the folded blade group is in the stored state of the blade group with the shutter opening opened, so that the size of the shutter in the vertical direction corresponding to the running direction of the blade group is reduced.

However, simply as the number of blade groups increases, the arm length increases as the number of blade support locations increases, so that the size in the shutter lateral direction perpendicular to the blade group traveling direction increases. In addition, when the arm length is not increased as much as possible (the first conventional example corresponds to this), the margin in the arm is reduced by the increase in the number of blade supporting portions, so that the size in the lateral direction of the shutter is further reduced. It becomes difficult.

In addition, the overlap of the five blades is one more in the case of the five blades than in the case of the four blades, the total blade area is increased, and the inertia of the whole blade unit is increased by adding one blade support. It increases surely, which is disadvantageous for high-speed driving.

On the other hand, in the case of three blades, the number of blade supporting portions is reduced, and the margin on the arm is increased, which is advantageous for further reducing the size in the lateral direction of the shutter. However, under the condition that a predetermined blade overlap amount (for example, 4 mm) is secured when the blade group with the shutter opening closed is unfolded, the blade is not folded small in the stored state of the blade group with the shutter opening opened, so that it matches the running direction of the blade group of the shutter. The dimension in the vertical direction becomes larger.

If the size in the vertical direction is to be reduced, the amount of overlap between the blades when the blade group is expanded becomes small, and the light shielding property cannot be maintained. After all, the three blades have a poor balance of the vertical and horizontal dimensions of the shutter, and are difficult to mount on a camera.

Actually, in order to secure the blade overlap amount capable of realizing a sufficient light-shielding performance, achieve a good balance of the aspect ratio of the shutter, and effectively reduce the width, as in the first embodiment, -A four-sheet configuration is optimal for both rear curtains.

Arm length (dimension D from the center of rotation of the trunk of the arm to the center of rotation of the swaging dowel supporting the slit forming blade at the tip of the arm) A group of four blades is rotatably supported.
The longitudinal dimension A of a is aimed at a minimum length such that the slit forming blades 2 and 10 can move sufficiently.

Maximum arm operating angle θ around the center of rotation of the backbone of the arm When the arm length D is reduced as described above, the shutter opening 1a
In order for the moving distance of the slit forming blade to clear the vertical dimension A of the above, naturally, θ will be increased accordingly.

One dimension E between the first and second arms is as follows. When the maximum operating angle θ of the arm is increased, if the dimension between the arms is the same as before, it is stored (superimposed) when the blade group is deployed.
In some cases, interference between the first and second arms, particularly between the blade support portions, occurs, and a sufficient operating angle cannot be obtained.

The other is that when the operating angle is increased, the blade tip side opposite to the blade supporting portions of the slit forming blades 2 and 10 is in the shutter opening 1a in a state close to the blade group deployed state and the retracted (superimposed) state. To enter a lot. This is because there is a fitting play in the blade support, and this play is enlarged at a position farther than the support, so that the slit forming blades 2 and 10
(Slit formation parts 2a and 10a) means deterioration of the parallelism.

In order to solve the above two problems, the dimension E between the first and second arms is increased. Also, from the characteristics of the parallel link, by expanding the span between the arms forming the parallel link, the stability of the parallelism during operation of the slit forming blade supported by the arm is improved.

If the arm length D is shortened and the arm maximum operating angle θ is increased from the blade end side end surface of the shutter opening 1a to the blade end side end surface of the shutter base plate 1, the blade group (particularly the slit) is opened and closed. The displacement amount in the direction perpendicular to the running direction of the forming blade) increases, and the dimension C
It is disadvantageous to reduce. However, the slit forming portion corner R (2c, 10
c) is reduced to the minimum necessary, the slit forming portion is provided to the very end of the blade, the length of the slit forming blade is cut down, or the tip shape of each blade is simplified to a linear shape along the end surface of the shutter base plate, and the blade group In order to secure the light-shielding property and to prevent the blade from coming off when a photographer inadvertently presses with a finger or the like, the amount of engagement between the tip of each blade and the shutter base plate 1 or the cover plate around the shutter opening 1a at the time of development is determined. By doing so, the dimension C can be reduced.

Arrangement of blade support (wing caulking dowel) on arm FIG. 3 and FIG. 4 are explanatory views of the effect on the arrangement of the blade support on the arm. FIG. 3 is a plan view illustrating a slit forming portion, and FIG. 4 is a plan view illustrating a light shielding portion, both of which are in the middle of running a shutter. Since both the first and second curtains have the same structure, only the second curtain is shown in the description.

In these figures, reference numeral 10b denotes an end of the slit forming blade 10 on the side of the backbone of the slit forming arm, and reference numeral 18 (indicated by a two-dot chain line) denotes a # 3 blade 12 arranged in a conventional manner.
And 11a is the arm-side light-shielding piece of the # 2 blade 11, and 12a is the arm-side light-shielding piece of the # 3 blade 12.

As shown in FIG. 19 and FIG. 20, the conventional blade supporting portion (blade caulking dowel) on the arm is arranged in the rear curtain of the four-bladed structure, in which the center of rotation of the arm main body (101f, 1
01g) and the slit forming blade support portion (11
6a, 117a) When viewed from the distance from the line connecting the rotation center, the rotation center of the # 2 blade support portion (116b, 117b) is the farthest among the rotation portions of the blade support portion (the distance is f in the figure). ), # 3 for blades, and # 4 for blades.

On the other hand, in the front curtain of the five-sheet configuration, similarly, when viewed from a line segment connecting the rotation center of the arm main part (101d, 101e) and the rotation center of the slit forming blade support part (108a, 109a) at the tip of the arm. The rotation center of the support portion (108c, 109c) of the # 3 blade is the farthest among the rotation centers of the support portions of the blade (the distance is g in the figure).
The order is for blades, # 4 blades, and # 5 blades.

As described above, in order to effectively reduce the lateral dimension of the shutter, a four-blade configuration is optimal for both the front curtain and the rear curtain. When the learned blade support portion arrangement is performed on the arm, the arrangement of the # 3 blade caulking dowel 18 is as shown by a two-dot chain line in FIG.

In this case, since the end 10b of the slit forming portion of the slit forming blade 10 interferes with the caulking dowel 18 for the # 3 blade, the end 10b of the slit forming portion arm is formed as shown by an arrow. It must be moved about 1.5 mm to the tip of the blade as in 10b '.

Then, the outermost movement trajectory of the slit forming portion arm base end 10b 'is indicated by H and enters the shutter opening 1a, so that the slit cannot be formed as a shutter. In order to avoid this, it is necessary to extend the tip of the slit forming blade 10 by approximately 1.5 mm and move the entire blade unit by approximately 1.5 mm toward the backbone of the arm (leftward in the figure) with respect to the shutter opening 1a.

In addition to this, the arm-side light-shielding piece 11a of the # 2 blade 11 also interferes with the caulking dowel 18 for the # 3 blade, so the light-shielding piece 11a must be released. For example, if the light-shielding piece 11a is deleted as shown by hatching in the figure, as shown in FIG. 4, the portion 19 (the slit-forming blade 10 and the arm-side light-shielding piece 12a of the # 3 blade 12 cannot be shielded during the operation of the blade unit). Gap formed between them), and the shutter function cannot be realized.

In this case, the horizontal dimension of the shutter is about 1.5 mm
However, it is not necessary to make the size larger than that of the first embodiment, and the horizontal dimension can be reduced only slightly as compared with the shutter of the first conventional example.

On the other hand, in the first embodiment, the arrangement of the blade supporting portions (wing caulking dowels) on the arm is also the same as the arm base rotation center (1f, 1g) and the slit forming blade supporting portions (16a, 17a) at the tip of the arm. Looking at the distance from the line segment connecting the rotation center, the rotation center of the support portion (16c, 17c) of the # 3 blade is the farthest from the rotation center of the blade support portion (the distance is F in the figure). #For 2 blades, #
The order is for four blades.

By arranging in this way, the above described
There is no interference between the end 10b of the slit forming portion of the slit forming blade 10 and the caulking dowel 17c for the # 3 blade,
The outermost movement trajectory of the slit forming portion arm main body side end 10b does not enter the shutter opening 1a as shown by I. Further, the arm-side light shielding piece 11 of the # 2 blade 11
Since a does not interfere with the # 3 blade caulking dowel 17c, a sufficient arm-side light-shielding piece 11a can be formed, so that light can be reliably shielded during operation.

As a result, the lateral dimension of the shutter of the first embodiment can be reduced by 6 mm as compared with the shutter of the first conventional example.

Next, the dimensions of each part will be concretely examined.

First, the dimension B is 19.2 mm in the first conventional example shown in FIGS. 19 and 20. The diameter of the swaged dowel is reduced, and the allowance during and after movement between the blade members is reduced. Although the size can be reduced to about 1 mm, it is possible to reduce the size of B more than that, since the arm side end of the slit forming portion of the slit forming blade enters the inside of the shutter opening, the front curtain and the rear A rectangular slit formed by the slit forming portion of the curtain and the shutter opening cannot be formed, and the shutter function cannot be realized. The technology of the present invention is required to reduce the B size to 2 mm or more.

On the other hand, a shutter which is reduced in size by the technique of the present invention and which is close to the optimum balance is the first embodiment,
The dimensions are 14.2mm. To further pursue the limit of miniaturization, the material of the rotation center shafts 1d, 1e, 1f, 1g of the arm backbone was changed from plastic integrally formed with the shutter base plate to metal such as stainless steel. Reduce the diameter from φ1.6mm to φ1.0mm. Accordingly, the outer radius of the main part of each arm of the front curtain and the rear curtain is reduced by 0.3 mm.

Accordingly, the end surface of the shutter base plate on the left side in FIG. 1 can be shifted to the right. Since the size reduction of 2 mm is the upper limit of the B dimension from the first conventional example, and the size reduction of 0.3 mm is the lower limit of the B size from the first embodiment, it is expressed by the following relational expression.

{(14.2−0.3) /24.7} A ≦ B ≦ {(19.2−2) /24.7} A∴0.56A ≦ B ≦ 0.70A (1) Within the B dimension range of the above formula (1) Thus, the dimension B can be freely selected by the technique of the present invention.

Next, regarding the dimension C, the first dimension in FIGS.
In the conventional example of Fig. 1, it is 7.7mm, and if the minimum size at which the miniaturization can be felt at all is 0.3mm, the upper limit dimension is 7.4mm.

Since the dimension C is determined substantially by the tip trajectory of the slit forming blade, as described above, if the arm length D is shortened and the arm maximum operating angle θ is increased as in the present invention, the blade by opening and closing operation is increased. The displacement amount in the direction perpendicular to the running direction of the group (especially the slit forming blades) increases, and the dimension C
It is disadvantageous to reduce.

However, the shutter which is reduced in size by the technique of the present invention and is close to the optimum balance (first embodiment)
Then, the C dimension can be set to 6.7 mm. Further pursuing the limit of miniaturization, the slit forming portion corner R on the tip side of the slit forming blade is made as small as possible (almost zero).
When the slit forming part is provided just up to the tip of the blade,
The length of the slit forming blade tip can be reduced by 0.7 mm.

The tip of the blade other than the slit formation is also about
Cut down 0.7mm, C dimension lower limit is 6.0mm. If it is smaller than this, the slit forming portion enters the inside of the shutter opening 1a during the operation of the blade group, and the function of the shutter cannot be realized. In addition, when the blade group is deployed, the amount of engagement between the tip of each blade and the shutter base plate 1 or the cover plate around the shutter opening 1a is also the minimum necessary for ensuring light-shielding properties and preventing the blades from coming off due to inadvertent pressing by the photographer. Even the limit cannot be secured.

Therefore, the dimension C is expressed by the following relational expression.

(6.0 / 24.7) A ≦ C ≦ (7.4 / 24.7) A∴0.24A ≦ C ≦ 0.30A (2) Within the range of the C dimension of the above formula (2), it is free according to the technology of the present invention. C dimension can be selected.

Next, with regard to the D dimension, FIG. 19 and FIG.
23.0mm in the conventional example 1 and the B dimension of the first conventional example
When the technology of the present invention is used in correspondence with the reduction of 19.2 mm by 2 mm, FIG. 5 (running schematically showing the balance between the arm of the front curtain and the slit forming blade and the inclination of the slit forming portion with respect to the main plate size) In the diagram of the completed state, 2 'indicated by a two-dot chain line indicates a state in which the slit forming blade has moved to the most distal end side, and 2 "indicates a state in which the slit forming blade has moved to the traveling preparation completed position. D dimension is from
22.2mm.

In the shutter that is reduced in size by the technique of the present invention and is close to the optimum balance (first embodiment), the D dimension is 1
9.8mm, further pursuing the limit of miniaturization, another 0.5
mm can be reduced to 19.3 mm. For this purpose, the maximum operating angle θ of the arm is increased, the first and second arm shapes that would otherwise interfere with each other are made thinner to increase the escape amount, the diameter of the blade caulking is reduced, and the light-shielding piece near the arm is reduced. This is made possible by alleviating the constraint on the shape of each blade and further reducing the amount of overlap between adjacent blades when the blades are deployed.

FIG. 6 is a diagram showing a completed state of running, schematically showing the balance between the arm of the front curtain and the slit forming blade with respect to the main plate size and the inclination of the slit forming portion. The state where the blades have moved to the most tip side,
2 ″ indicates a state in which the slit forming blade has moved to the travel ready position. Note that the same applies to the second curtain, so omit it.

If the dimension D is smaller than this, it becomes difficult to support each blade in terms of space. In addition, if the arm shape is further reduced or the diameter of the blade caulking is reduced, the arm strength and the blade caulking strength decrease. It's gone, and it goes bankrupt. In addition, the light shielding is inadequate, and the function as a shutter cannot be achieved.

Accordingly, the D dimension is expressed by the following relational expression.

(19.3 / 24.7) A ≦ D ≦ (22.2 / 24.7) A∴0.78A ≦ D ≦ 0.90A (3) Within the range of the dimension D of the above-mentioned formula (3), it is free by the technique of the present invention. To
D dimension can be selected.

Next, regarding the arm maximum operating angle θ, FIG.
9. In the first conventional example shown in FIG. 20, the arm operating angle from the traveling completion state to the traveling preparation completion state is 74 ° to 75 °, and the overcharge is up to 4 ° (measuring of a charging mechanism (not shown depending on each shutter). No overcharge due to roller
(Varies between 0 ° and 4 °), and the total arm operating angle is 79 °.

When the technique of the present invention is used corresponding to the above-mentioned B dimension 17.2 mm and D dimension 22.2 mm, as shown in FIG. 5, the lower limit value of the arm maximum operating angle θ is 80 ° + (overcharge 0 °).
44 °).

In the shutter (first embodiment) which is miniaturized by the technique of the present invention and is close to the optimum balance, θ is 87 ° +
(Overcharge 0 ° -4 °), and pursuing the limit of further miniaturization, θ is 90 ° + (overcharge 0 ° -4 °) corresponding to the above-mentioned D dimension of 19.3mm as shown in FIG. Becomes

Therefore, θ is represented by the following relational expression.

80 ° ≦ θ ≦ 94 ° (4) Within the range of θ in the above equation (4), θ can be freely set by the technique of the present invention.
Can be selected.

As θ is increased in this manner, the drive pins of the front curtain drive lever and the rear curtain drive lever (not shown) that apply running energy to the front curtain and the rear curtain, respectively, by spring force, etc.
(6a, 1)
4a) is limited. In other words, the front and rear curtain drive levers
Since the arm rotates coaxially with the rotation centers 1d and 1f of the arms 6 and 14, when the turning radius of the drive pin is increased, the larger the θ, the more the area occupied by the drive pin operation trajectory is increased, and the degree of freedom of the blade arrangement is increased. This is disadvantageous for miniaturization.

Therefore, it is required to minimize the turning radius of the drive pin. In addition, it is preferable that the positions of the drive pins (the same positions as 6a in FIG. 2 and 14a in FIG. 1) in the overcharge state after the completion of the running of the front curtain and the charging of the rear curtain be as close to the left end of the shutter base plate as possible.

In recent cameras, a film is wound on a rubber-wound spool utilizing a frictional force without using a sprocket for the film feeding mechanism.
Indexing of the film screen is now performed by the photo sensor instead of detecting the rotation amount of the sprocket.

For this reason, a clearance has been provided above and below the left end of the shutter base plate from a certain area in accordance with the shape of a sprocket that has been present on the left side of the shutter with the wall of the camera body (not shown) interposed therebetween (FIG. 19). , 101i, 1 in FIG.
01j).

In the first embodiment of the present invention, noting that it is not necessary to provide the escape of the sprocket, the turning radius of the drive pin is made as small as possible, and the running completion state of the front curtain and the charging completion of the rear curtain are completed. The position of each drive pin (the same position as 6a in FIG. 2 and 14a in FIG. 1) in the overcharged state is changed from the rotation centers 1d and 1f of the first arms 6 and 14.
Is approached to the left end of the shutter base plate 1 so that the first curtain is right below and the second curtain is right above.

Next, regarding the E dimension, the first dimension shown in FIGS.
The parallelism of the slit forming portion at this time is represented by the inclination angle of the slit forming portion and the distance between both ends of the slit forming portion (linear portion) in the blade running direction (vertical direction in the figure).

The condition is that there is no looseness in the fitting of the rotating shafts (101d, 101e, etc.) of the arm backbone.
The swaged dowels supporting the slit forming blades on the arm are fitted with holes H8-shafts f8, and the maximum play is 34 μm for a diameter of 1.5 mm.

The results are shown in FIG. 9 (a diagram of the running completion state schematically showing the balance between the arm of the front curtain and the slit forming blades and the inclination of the slit forming section with respect to the main plate dimensions, and the same applies to the rear curtain, and the description is omitted. ). According to this, the inclination angle of the slit forming portion is 0 ° 18′18 ″, and the distance in the blade running direction at both ends of the slit forming portion is 0.22 mm.

Using the technology of the present invention, corresponding to the above-mentioned B dimension 17.20 mm, D dimension 22.2 mm and the lower limit value 80 ° of the arm maximum operating angle θ, the inclination angle of the slit forming section and the blade running at both ends of the slit forming section. In order to maintain the directional distance at the same level or higher under the same backlash condition as the conventional example, as shown in FIG.
The dimensions are 8.25mm.

In the shutter which is reduced in size by the technique of the present invention and is close to the optimum balance (first embodiment), the E dimension is
8.46 mm, and FIG. 7 (a diagram of the traveling completed state schematically showing the balance between the arm of the front curtain and the slit forming blade and the inclination of the slit forming portion with respect to the main plate size of the shutter according to the first embodiment, Under the same backlash conditions as in the above-mentioned conventional example, the inclination angle of the slit forming portion is 0 ° 18'0 ", and the distance in the blade traveling direction at both ends of the slit forming portion is 0.22 mm, as shown in It is slightly better than the one.

If the E dimension is kept at 8.06 mm as before with a shutter (first embodiment) that is reduced in size according to the technology of the present invention and reduced in size, only the E dimension in FIG. Under the same backlash conditions as in the above conventional example, the inclination angle of the slit forming portion is 0 ° 21′0 ″, as shown in FIG.
The distance in the blade running direction at both ends of the slit forming portion is 0.26 mm, and the parallelism of the slit forming portion is lower than that of the conventional one.

This means that the exposure unevenness of the exposure screen becomes worse. As a result, it can be seen that it is appropriate to increase the E dimension to 8.46 mm in order to improve the performance of the downsized shutter of the first embodiment over the conventional one.

Further pursuing the limit of miniaturization, the aforementioned D
In correspondence with the dimension 19.3 mm and the upper limit value 94 ° of the arm maximum operation angle θ, the technology of the present invention is used, and as before, the material of the rotation center axes 1d, 1e, 1f, 1g of the arm trunk is changed to the shutter base plate. Change the integrally molded plastic to a metal such as stainless steel and reduce the shaft diameter from φ1.6mm to φ1.0mm. Accordingly, the outer radius of the main part of each arm of the front and rear curtains is reduced by 0.3 mm. As a result, the front curtain and the rear curtain in FIG. 1 can be moved closer to each other by 0.3 mm in the vertical direction. In addition, if it is allowed to be the same as the vertical dimension of the first conventional shutter without enlarging the portion 1k adjacent to the finder eyepiece optical path of the camera, both the front and rear curtains in the vertical direction One arm can move 0.8mm.

Therefore, when combined, the E dimension is 9.56 mm. As shown in FIG. 6, under the same backlash conditions as in the above-described conventional example, the inclination angle of the slit forming portion is 0 ° 16'59 ”, and the blade traveling distance at both ends of the slit forming portion is 0.21 mm, which is an improvement over the conventional one. ing.

It is to be noted that if the E dimension is larger than this, the viewfinder optical path of the camera is affected, and the vertical dimension of the shutter is undesirably increased.

Therefore, the E dimension is expressed by the following relational expression.

(8.25 / 24.7) A ≦ E ≦ (9.56 / 24.7) A∴0.33A ≦ E ≦ 0.39A (5) Within the E dimension range of the above formula (5), it can be freely performed by the technique of the present invention. E dimension can be selected.

As described above, in the first embodiment, the shutter base plate 1 on the side supporting the arm trunk (left side in FIG. 1) from the end surface of the shutter opening 1a on the arm trunk side (left side in FIG. 1). B to the end face of the shutter opening 1a, the dimension C from the end face of the blade tip side (right side in FIG. 1) to the end face of the shutter base plate 1 on the tip side of the blade (right side in FIG. 1), and rotation of the arm trunk. A dimension D from the center to the swivel dowel rotation center supporting the slit forming blade at the tip of the arm,
Maximum arm operating angle θ around the center of rotation of the backbone of the arm,
Each of the dimensions E between the first and second arms of the parallel link formed by the first arm and the second arm alone is (1) to (5).
Although it has been described that selection is possible within the range of the expression, as shown in FIGS. 5, 6, and 7, there are combinations (good balance) between the respective dimensions.

The main factors for miniaturization are D dimension and θ.
By adjusting the interference of the blade support portion and maintaining the parallelism of the slit forming blade with the E dimension, the interference adjustment of the blade support portion and the overlap of the blades are achieved by devising the arrangement of the blade support portion [connecting member (blade caulking dowel)] on the arm. Dimensions B and C are determined by D, θ, and E to ensure light-shielding properties such as maintaining the amount.

In the first embodiment, the length of the arm is reduced, the rotation angle of the arm is increased, and the link interval between the arms is increased. As a result, the blade overlap amount for light shielding is secured, the parallelism of the exposure slit is not deteriorated, the structure of the blade unit is not complicated, the operating resistance and inertia are kept small, and it is suitable for high-speed operation. The size of the shutter can be reduced, and in particular, the size in the direction perpendicular to the blade traveling direction can be reduced.

If the advantage that the inertia of the blade unit is small is not used for improving the curtain speed and the curtain speed is kept the same as the conventional one, the required shutter charge energy is reduced, and the charging mechanism is simple and thin. The camera can be made smaller. Further, it is convenient to increase the frame speed during continuous shooting by the camera.

(Second Embodiment) FIGS. 10 to 18 show a second embodiment of the present invention, in which the shutter device of the present invention is applied to an image display device suitable for a photo stand, an electronic album, or the like. It is.

This image display device optically projects a negative image onto a display screen, and comprises a spatial light modulator (hereinafter, referred to as an SLM) capable of inverting the negative image on the screen, thereby enabling general users to use the image. It allows you to appreciate the negative film that is used. In particular, SL
By using a ferroelectric liquid crystal (hereinafter referred to as FLC) for the M liquid crystal, the negative image can be instantaneously converted to SL using the flash used in cameras etc. by utilizing the memory characteristics of the FLC.
M is written in M, and the image is read and observed with light.

The details will be described below.

FIG. 10 is an image diagram of the image display device 321. By loading a developed IX240 film (hereinafter, referred to as a D-cart 322) as a negative film into the image display device 321, the photographing screen becomes negative. The image is inverted and displayed as a high-definition image.

FIG. 11 is a sectional view of the image display device 321. In the drawing, reference numeral 323 denotes a developed negative film on which a photographed image is drawn out of the D cart 322, and is configured to be indexed frame by frame by a known film winding mechanism, one frame at a time. .

Numeral 324 denotes a milky white diffusing plate for uniformly diffusing light emitted from a flash unit 325 described later.
It is configured to illuminate the negative film 323.
Reference numeral 325 denotes a strobe device used for a camera or the like, which includes a Xe tube, a reflector, a light emitting circuit, and the like, and emits light in response to a trigger signal from a known microprocessor (not shown).

Reference numeral 326 denotes an orange-base removing filter that serves to remove the orange-based color from the negative image, and is constituted by an optical filter that has a blue color that is a complementary color to orange.

Reference numeral 327 denotes a projection lens, which projects the negative image of the negative film 323 at a predetermined magnification through a reflection mirror 328 onto a photoelectric conversion layer of an SLM 329 described later.

Reference numeral 329 denotes an SLM, the structure of which will be described in detail with reference to FIG. FIG. 12 (a) shows the state of FIG.
FIG. 2B shows the configuration of the SLM 329 during image observation.

Reference numeral 329a denotes a color filter of a pure color or a complementary color, for example, an image sensor used in a video camera or the like.
It is desirable for the present image display device because a fine object used in a CCD can be observed without deteriorating a silver halide image.

Numerals 329b and 329h denote polarizing plates sandwiching a liquid crystal layer to be described later. In the configuration shown in FIG. 12, 329b has a polarization direction opposite to the paper surface and 329h has a horizontal direction relative to the paper surface. It has a configuration.

Reference numerals 329c and 329f denote transparent conductive films (hereinafter referred to as ITO films) which are usually made of indium oxide or the like.
Therefore, the AC power supply 330 and a circuit for driving the
331 is configured so that potentials of different polarities are generated in the respective ITO films 329c and 329f. Three
29d is a photo-con layer, an amorphous film or OPC
(Organic semiconductor film) or the like, and one surface is in close contact with the ITO film 329c, and the other surface is in close contact with the FLC 329e described later.

An FLC 329e is a liquid crystal layer, one side of which is in close contact with the photocon layer 329d as described above, and the other side of which is in close contact with the above-mentioned ITO film 329f. 329
g is a glass, which serves to seal the liquid crystal layer and at the same time protect the other layers. 329j is the negative film 32 projected by the projection lens 327 described above.
3 is a negative film image depicting a virtual image of a third pixel for explanation.

In FIG. 11, reference numeral 332 denotes a straight tube type illumination means often used for flat displays and the like.
Numeral 0 denotes a shutter device arranged before the SLM 329.

13 and 14 are views of the shutter device 300. FIG. 13 is a front view showing a state where the screen of the SLM 329 is shielded from external light, and FIG. 14 is a front view showing a state where the screen of the SLM 329 is opened.

In these figures, reference numeral 301 denotes a substrate having a shutter opening (hereinafter, referred to as a shutter base plate);
1a is a shutter opening, 301b is a long hole for escaping the traveling locus of a driving pin of a driving lever (a lever for applying a moving energy to the blade unit), 302 is a first blade, and 302a is extended in the longitudinal direction. End, 303 is second
, 304 is the third blade, 305 is the fourth blade, 3
Reference numeral 06 denotes a first arm, which has its main part 306b rotatably pivoted about a shaft 301d provided on the shutter base plate 301, and a swaging dowel 308 provided on the distal end side of the arm.
The first blade 302 is rotatably supported on the arm 306 by a.

Reference numeral 306a denotes a hole into which a drive pin of a drive lever (not shown) is fitted, through which power can be transmitted from a drive lever (not shown) provided with a rotary shaft coaxially with the shaft 301d. The drive lever (not shown) is a motor 333.
Is transmitted via a gear train 334 (simplified representation by a two-dot chain line in FIG. 11).

Reference numeral 307 denotes a second arm, and its backbone 30
7b is rotatably pivoted about a shaft 301e provided on the shutter base plate 301, and the first blade 302 is rotatably supported with respect to the arm 307 by a caulking dowel 309a provided on the distal end side of the arm. In this way, the first blade 302, the first arm 306, and the second arm 307 form a parallel link.

Similarly, the second blade 303 and the third blade 3
04, the fourth blade 305 is connected to the first arm 306 and the second
Each of the caulking dowels 308 is provided at an intermediate portion of the arm 307.
b, 309b, 308c and 309c, 308d and 309
It is rotatably supported at d and forms a parallel link. As described above, the blade unit 340 as the light shielding means is configured.

FIG. 15 is a block diagram of the present invention. In FIG. 15, reference numeral 335 denotes control means for controlling the entire sequence of the image display device 321, and 336 denotes a motor control for controlling the forward / reverse rotation of the motor 333. A circuit 337 is a light emitting circuit for controlling light emission of the strobe device 325, and a circuit 338 is an SLM.
An SLM control circuit that controls a SW 331 that switches ON / OFF of energization to the 329.

Reference numeral 339a denotes a light-shielding state detection switch which is turned on when the blade unit 340 as the light-shielding means completely shields the shutter opening 301a. Reference numeral 339b denotes a light-shielding state when the blade unit 340 as the light-shielding means is in the shutter opening 301a.
Is a light-shielding release state detection switch that is turned on when light-shielding is completely released. Numeral 341 denotes a diffusion unit linked to the light shielding unit 340. The diffusion unit 341 diffuses the illumination light of the illumination unit 332 to cover the SLM from the state in which the covering of the SLM 329 by the light shielding unit 340 is released, and makes the SLM 329 substantially uniform. While the light shielding unit 340 covers the SLM 329 and shields the light, the diffusion unit 341 is in a state retracted from the state covering the SLM.

The operation of the light shielding means 340 in the image display device 321 will be described below with reference to the flowchart of FIG. Note that the flowchart starts when the D-cart 322 is loaded in the image display device 321 of the present embodiment.
21, a light-shielding state covering the shutter opening 301a,
That is, the user cannot observe the image of the SLM 329.

When the user uses the image display device 321 to
D cart 322 to view images in cart 322
Is loaded into the image display device 321 (S101), the image display device 321 performs a thrust operation of sending out the negative film 323 in the D cart 322, and one frame of the D cart 322 is provided to an aperture unit (not shown) of the image display device 321. The eye is positioned and stopped (S102).

In this state, the apparatus enters a standby mode for waiting for a signal from each switch (not shown) (S103).

When a signal from the remote controller or the like that advances the screen to a certain frame is input (S104), the designated frame is brought to the aperture section of the image display device 321 (S105). It waits in a command waiting state as to whether to display a frame (S106).

When a display command from the user is received from this state (S107), the control means 335 switches the switch state to OFF by the light shielding state detection switch 339a.
Is switched to ON, and it is confirmed whether or not it is detected that the light shielding means 340 is in the light shielding state.

That is, the operation described below (erasing the previously displayed frame image and writing a new image) is performed by the light shielding means 340 by the shutter opening 301 of the image display device 321.
In order to perform a in a state where light is completely shielded, it is checked whether or not the light shielding means 340 is set in that state (S108). If the light-shielding means does not completely shield the shutter opening 301a of the image display device 321, the process proceeds to a subroutine of "light-shielding means set" described later.

After confirming the position of the light shielding means 340,
First, SW3 to erase the image of the frame displayed last time
After turning on the power supply 31 (S109), the illuminating means 332 is turned on (S110), and an electric field on the opposite side to that at the time of writing is applied from the power supply 330 (S111).

Then, in the FLC 329e, all the cells are inverted to the horizontal state partially shown in FIG. 12 to be in the neutral state (S112). After performing the reset operation for a sufficient time for all cells to enter the above state,
1 is turned off to turn off the lighting means 332 (S113, S114).

From here, the flow of the writing operation of a new image is performed.

The current state of the image display device 321 is, for example, placed on a shelf such as an office desk or a home wall, and is placed in a brightness of about several hundred lux. The external light is supplied to one polarizing plate 329h and the liquid crystal layer 3
Approximately halved by passing through the photocon layer 329
d, but in the current state, SW331
Is open, no electric field is applied between the ITO films 329c and 329f, and the FLC 329e does not react.

Here, after the SW 331 is closed and the power is turned on,
(S115), the forward electric field when writing an image from the power supply 330
It is applied to the O films 329c and 329f (S116). Then, the strobe device 325 emits light (S117), and the image of the negative film 323 is projected by the strobe light to print the image on the SLM 329. Since the flash emission performed in step S117 is completed in about 500 μsec.
The ON of the SW 331 performed at the same time is performed for about the same time and at the same timing.
Is turned off to cut the electric field (S118).

Thereafter, the light shielding means 340 enters a subroutine "light shielding means open" for setting the shutter opening portion 301a of the image display device 321 to the light shielding release state so that the user can observe the image recorded on the SLM 329. After proceeding (S119), the illuminating means 332 is turned on so that the user can view it in a transmitted illumination manner (S120). Thereafter, the image display device 321 enters a standby state for receiving the next command (S103).

The operation of the subroutine "light shielding means set" and "light shielding means open" will be described below.

"Light-shielding means set" (refer to the flowchart in FIG. 17) In order for the light-shielding means 340 to completely shield the shutter opening 301a of the image display device 321, the motor 333 is first rotated forward (S130). Then, the gear train 33
14, the blade arm 306 rotates counterclockwise about the axis 301d, and the light blocking means 340 moves from the light blocking release state in FIG. 14 to the light blocking state in FIG. Then, the diffusion unit 341 linked with the light shielding unit 340 removes the cover from the state where the SLM 329 is covered so that writing to the SLM can be performed, and when the light shielding unit 340 completely shields the shutter opening 301 a of the image display device 321. At substantially the same timing, the light-shielded state detection switch 339a switches from OFF to ON.

Therefore, the control means 335 is
Detects that the shutter opening portion 301a of the image display device 321 has been completely shielded from light (S131).
A signal for stopping the rotation of the motor is output to the motor control means 336, and the rotation of the motor 333 is stopped.
(S132).

Here, this subroutine ends.

"Opening of Light-Shielding Means" (Refer to the flowchart of FIG. 18) First, the motor 3
33 is rotated reversely (S140). Then, the blade arm 306 rotates clockwise around the shaft 301d via the gear train 334, and the light shielding unit 340 changes from the light shielding state in FIG.
It moves to the light-blocking release state of No. 4. Then, the light shielding means 34
The diffusing means 341 linked to 0 spreads the illuminating light of the illuminating means 332 over the SLM from the state in which the covering of the SLM 329 is released, so that the illuminating light 332 hits the SLM 329 substantially uniformly, and the light shielding means 340 displays the image. When the shutter opening 301a of the device 321 is completely released from light shielding, the light shielding release state detection switch 339b is turned off at almost the same timing.
Switch from to ON.

Therefore, the control means 335 is provided with the light shielding means 340.
Detects that the shutter opening 301a of the image display device 321 has been completely shielded from light (S141).
35, a signal for stopping the rotation of the motor is output to the motor control means 336, and the rotation of the motor 333 is stopped (S142).

Here, this subroutine ends.

As described above, the external light is blocked by the light blocking means at the time of writing an image, so that the influence of the external light, which occurs in the conventional image display device which writes the image while exposing the SLM 329 to the external light, is obtained. The noise of the image due to was eliminated.

Therefore, in order to obtain a clear image, a device which had to project a film image with a large amount of writing light from the strobe device 325 is no longer necessary. As a result, the size of the strobe device 325 is increased. , And the image display device 321 can be made compact. Further, it is no longer necessary to brighten the FNO of the projection lens 327, so that the lens outer diameter of the projection optical system can be designed to be compact.

Further, a drastic reduction in image writing time has been achieved.

The shutter device according to the second embodiment includes:
It is mounted on an image display device for observing an SLM having a predetermined screen size (for example, 75 mm in length and 111 mm in width). For example, the shutter opening 301a has a vertical dimension A of 74.1 mm and a horizontal dimension of 109.
Set to 8mm. When the size of the shutter device is reduced, the size of the components around the shutter opening 301a is reduced.

Therefore, the shutter base plate 30 on the side supporting the arm backbone (left side in FIG. 13) from the end face of the arm backing side (left side in FIG. 13) of the shutter opening 301a.
The dimension from the end face of the shutter opening 301a to the end face of the shutter opening plate 301a (right side in FIG. 13) to the end face of the shutter base plate 301 on the tip side of the blade (right side in FIG. 13) is C. .

The dimension from the center of rotation of the arm backbone to the center of rotation of the caulking dowel supporting the first blade at the tip of the arm is D, the maximum operating angle of the arm about the center of rotation of the backbone of the arm is θ, and the first arm is θ. Let E be the dimension between the first and second arms of the parallel link formed by the second arm and the second arm.

The outer shape of the shutter device shown by a two-dot chain line in FIGS. 13 and 14 shows the case where a conventional blade unit is used, and the second embodiment uses the same technology as the first embodiment. Therefore, the lateral dimension of the shutter device is 18 mm smaller than the conventional one.

In the second embodiment, the blade units are arranged alternately, such as by swaging the blades, so that the rotation angle of the arm can be greatly increased. In the blade overlapping state, the two blades ( Third and fourth blades) 304, 305 caulking dowels 308c, 309
c, 308d and 309d are horizontal end portions 3 of the outer shape of the shutter base plate.
01l and can be located along the lateral end 301l, so that the blade swage dowels 308c and 308d (and 309d)
The horizontal distance between c and 309d) is 1.32 mm, and when the angle of the overcharge is considered at a maximum of 4 °, these horizontal distances when the blade unit is superimposed can be almost 0 (zero) mm.

Therefore, it can be seen that the effect of reducing the size in the direction (lateral dimension) perpendicular to the direction of travel of the blades of the shutter is enormous.

Points of interest for the miniaturization of the shutter device (including the arrangement of the blade support portion (blade caulking dowel) to the arm) and the specific dimensional ratios are the same as those in the first embodiment. Equations (1) to (5) derived in the first embodiment
Holds true in the second embodiment.

Also, as in the first embodiment, there is a combination (with a good balance) suitable for each dimension.
The main components of the miniaturization are the D dimension and θ, and the E dimension adjusts the interference of the blade support and maintains the parallelism of the slit forming blade, and arranges the blade support [connecting member (blade caulking dowel)] to the arm. In order to secure the light shielding properties such as the interference adjustment of the blade support part and the maintenance of the blade overlap amount, the dimensions B and C are
The dimensions are derived by θ and E.

Also in the second embodiment, the length of the arm is reduced, the rotation angle of the arm is increased, and the link interval between the arms is increased as compared with the conventional one. This ensures that the blades overlap for light shielding, does not degrade the parallelism of the blade unit, does not complicate the structure of the blade unit, keeps the operating resistance and inertia small, and is suitable for high-speed operation. The size of the shutter can be reduced, and in particular, the size in the direction perpendicular to the blade traveling direction can be reduced.

If the advantage that the inertia of the blade unit is small is not used for improving the driving speed and the driving speed is kept the same as the conventional one, the necessary shutter driving energy is reduced, so that the motor 333 and the gear train 334 are required. The driving mechanism is simple and thin, and the image display device can be downsized.

[0184]

As described above, according to the present invention, the overlapping amount of blades for light shielding is ensured, the operating resistance and inertia are kept small without complicating the structure of the blade unit, and suitable for high-speed operation. In this manner, the size of the shutter can be reduced, and in particular, the size in the direction perpendicular to the blade traveling direction can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a focal plane shutter according to a first embodiment of the present invention, in which a blade group is in a traveling ready state;

FIG. 2 is a front view of the focal plane shutter according to the first embodiment of the present invention in which a blade group is in a traveling completed state.

FIG. 3 is an explanatory diagram of an effect obtained by devising a blade holding position on an arm of the focal plane shutter according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of an effect obtained by devising a blade holding position on an arm of the focal plane shutter according to the first embodiment of the present invention.

FIG. 5 is an example of a focal plane shutter using the technology of the first embodiment of the present invention, schematically showing the balance between the arm of the front curtain and the slit forming blade and the inclination of the slit forming portion with respect to the main plate size. The front view of the running completion state shown.

FIG. 6 is a view showing another example of the focal plane shutter using the technique of the first embodiment of the present invention, in which the balance between the arm of the front curtain and the slit forming blade and the inclination of the slit forming portion with respect to the main plate size are schematically illustrated. FIG.

FIG. 7 is a front view of the traveling completed state schematically showing the balance between the arm of the front curtain and the slit forming blade and the inclination of the slit forming portion with respect to the main plate size of the focal plane shutter according to the first embodiment of the present invention. FIG.

8 is a view showing a case where only an E dimension is different from FIG. 7;

FIG. 9 is a front view of a traveling completed state schematically showing the balance between the arm of the front curtain and the slit forming blade and the inclination of the slit forming portion with respect to the main plate size in the conventional focal plane shutter (first conventional example). FIG.

FIG. 10 is an image diagram of an image display device 321 according to a second embodiment of the present invention.

FIG. 11 is a sectional view of an image display device 321 according to a second embodiment of the present invention.

FIGS. 12A and 12B are diagrams showing a configuration of an SLM according to a second embodiment of the present invention, in which a) shows the time of image writing and b) shows the time of image observation.

FIG. 13 is a front view showing a state where a shutter device according to a second embodiment of the present invention shields an SLM screen from external light.

FIG. 14 is a front view showing a state where the shutter device according to the second embodiment of the present invention has opened the screen of the SLM.

FIG. 15 is a block diagram of an image display device according to a second embodiment of the present invention.

FIG. 16 is a flowchart of the image display device according to the second embodiment of the present invention.

FIG. 17 is a flowchart of a “light shield setting” subroutine of the image display apparatus according to the second embodiment of the present invention.

FIG. 18 is a flowchart of a “light-shielding unit open” subroutine of the image display device according to the second embodiment of the present invention.

FIG. 19 is a front view showing a state in which travel preparation is completed with a conventional focal plane shutter (first conventional example).

FIG. 20 is a front view showing a traveling completion state of a conventional focal plane shutter (first conventional example).

[Explanation of symbols]

 Reference Signs List 1 substrate having shutter opening (shutter base plate) 1a shutter opening 2 leading blade slit forming blade 3, 4, 5 leading blade 6 leading blade first arm 6b arm trunk 7 leading blade second arm 7b arm trunk 8a- d front blade caulking dowel 9a-d front blade caulking dowel 10 rear blade slit forming blade 11,12,13 rear blade 14 rear blade first arm 14b arm trunk 15 rear blade second arm 15b arm trunk 16a-d rear blade Caulking dowel 17a-d Rear blade caulking dowel 301 Substrate having shutter opening (shutter base plate) 301a Shutter opening 302 First blade 303 Second blade 304 Third blade 305 Fourth blade 306 First arm 306b Arm trunk 307 Second arm 307b Arm backbone 308a-d Casmed boss 3 09a-d

Claims (10)

[Claims] A substrate having a shutter opening formed therein; first and second arm members rotatably supported by the substrate; and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the second arm member The first and second arm members such that one of the formed connection portions is located between the connection portion formed on the first arm member and the center of rotation of the first arm member. A shutter device characterized by arranging a connection portion of (1). 2. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the second arm member Among the formed connection portions, the connection portion formed at a position second closest to the rotation center of the second arm member is formed between the rotation center of the first arm member and the rotation center of the first arm member. A shutter wherein a connection portion of the first and second arm members is arranged so as to be located between the connection portion of the first arm member formed at a position closest to a rotation center. apparatus. 3. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the first arm member The connection portion of the first and second arm members is arranged such that one of the formed joint portions is located between two connection portions formed on the second arm member. Shutter device. 4. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the first arm member has a plurality of connection portions. A connection portion of the first arm member formed at a position closest to the center of rotation is connected to a connection portion of the second arm member formed at a position second closest to the center of rotation of the second arm member. Of the first and second arm members so as to be located between a portion and a connection portion of the second arm member formed at a position third closest to the center of rotation of the second arm member. Connection part arranged Shutter device characterized and. 5. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the first arm member has a plurality of connection portions. A shutter device, wherein a connection portion of the second arm member is arranged such that a rotation center is located between two connection portions formed on the second arm member. 6. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the first arm member has a plurality of connection portions. The rotation center is located at a position closest to the rotation center of the second arm member and at a position next to the connection portion of the second arm member and the rotation center of the second arm member. A shutter device, wherein a connection portion of the second arm member is arranged so as to be located between the formed connection portion of the second arm member. 7. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the first arm member The connecting portion between the first and second arm members is adjusted so that a line connecting the two connecting portions formed and a line connecting the two connecting portions formed on the second arm member coincide with each other. A shutter device, wherein the shutter device is disposed. 8. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the first arm member has a plurality of connection portions. The connecting portion of the first arm member formed closest to the center of rotation and the center of rotation of the first arm member
A line connecting the connection portion of the first arm member formed at a position closest to the second position, and a connection portion of the second arm member formed at a position closest to the rotation center of the second arm member The first and second arm members so that a line connecting the second arm member and a connecting portion of the second arm member formed at a position second closest to the rotation center of the second arm member coincides with each other. A shutter device characterized by arranging a connection portion of (1). 9. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the first arm member has a plurality of connection portions. The rotation center is located at a position closest to the rotation center of the second arm member and at a position next to the connection portion of the second arm member and the rotation center of the second arm member. A connection portion of the second arm member formed between the second arm member and a connection portion of the second arm member formed at a position second closest to a rotation center of the second arm member; ,
The first arm member is positioned between the center of rotation of the first arm member and a connection portion of the first arm member formed at a position closest to the center of rotation of the first arm member. And a connecting portion for the second arm member. 10. A substrate on which a shutter opening is formed, first and second arm members rotatably supported by the substrate, and a plurality of shutters supported by the first and second arm members. In the shutter device having the blade, the first and second arm members each have a plurality of connection portions with the shutter blade, and when the shutter blade opens the shutter opening, the first arm member has a plurality of connection portions. The rotation center is located at a position closest to the rotation center of the second arm member and at a position next to the connection portion of the second arm member and the rotation center of the second arm member. The connection portion of the first arm member, which is located between the formed connection portion of the second arm member and the closest position to the center of rotation of the first arm member, Second arm member A connection portion of the second arm member formed at a position closest to the rotation center of the second arm member and a connection portion of the second arm member formed at a position closest to the rotation center of the second arm member at the third position A shutter device, wherein a connection portion of the first and second arm members is arranged so as to be located between the connection portion and the connection portion.