JP2001305606A - Shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a shutter, especially, to make it small in size in a direction orthogonal to a blade traveling direction while securing the superposed amount of blades for shielding light. SOLUTION: This shutter is provided with a base plate having a shutter aperture, a blade group consisting of plural blades formed to open/close the shutter aperture and an arm member connected with the blade group and freely turning with respect to the base plate, and relation between a distance D from the most separate connection part from the center of turning of the arm member out of the connection parts with the blades to the center of turning of the arm member and the dimension A of the shutter aperture in the blade traveling direction is set to 0.78A<=D<=0.90A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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, in the long arm type, as shown in Japanese Utility Model Publication No. 35-29651, a blade group is rotatably held by the arm on the opposite side of the shutter opening from the rotatable backbone. Is done. 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).
The first arm (106) and the second arm (10), each of which includes five blades, each of which has a main body rotatably supported on a shaft (101d, 101e).
7), the slit forming blade (102) formed to open and close the shutter opening and the covering blade (103, 10).
4, 105, 106) rotatable blade caulking dowel (1
08a, 108b, 108c, 108d, 108e, 1
09a, 109b, 109c, 109d, 109e) to form parallel links. The rear blades are composed of four blades, and the main shaft is similarly pivoted (101f, 101f).
g) a first arm (114) and a second arm (115) rotatably supported by a slit forming blade (110) and a cover blade (111, 112, 113) formed to open and close a shutter opening. ) Are rotatably driven by the blade caulking dowels (116a, 116b, 116c, 116d, 11).
7a, 117b, 117c and 117d) to form parallel links. (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 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, and other covers are provided. The outer dimension of the focal plane shutter in the left-right direction is reduced by setting the third arm supporting the blade group outside the area. (Hereinafter referred to as a second conventional example)

In Japanese Utility Model Publication No. Hei 6-26897, one of the two main arms for supporting the slit forming blade is connected to and supported by one of the other blades on one of the main arms, and the other is supported on the other shaft. Are supported by the other main arm and the auxiliary arm to reduce the size and improve the durability of the focal plane shutter. (Hereinafter, this is referred to as a third conventional example.)

Further, Japanese Utility Model No. 2501747 discloses a slit forming blade operated by a first parallel link mechanism and a second
With a cover blade operated by a parallel link mechanism,
The connection distance on the slit forming blade of the first parallel link is set to the second distance.
The connection distance on the cover blade of the parallel link is made longer to maintain the parallelism of the slit forming blade of the focal plane shutter and to reduce the space from the shutter opening on the base side of each parallel link. (Hereinafter referred to as a fourth conventional example)

[0011]

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 miniaturization in the first conventional example, the number of leading blades is as large as five, and the spacing of the swaging blades is narrowed while the arrangement of the blades is straightened. The degree of freedom of the free support position is reduced.
Therefore, interference within the blade unit (for example, FIG. 20)
Thus, interference between the outer periphery of the main portion of the first arm 106 and the outer periphery of the second arm 107 and the covering blade 105 around the blade caulking dowel 109e, the outer periphery of the first arm 106 around the blade caulking dowel 108e, and the blade caulking dowels 109c and 109d.
Interference with the periphery of the second arm 107 and the surrounding blades 104 and 105 occurs, and the rotation angle of the arm cannot be increased (as long as the size of the shutter opening in the blade traveling direction is constant, the arm is not used in the parallel link). When the length of the blade is shortened, it is necessary to increase the rotation angle of the arm to move the blade by a predetermined distance.) In addition, the amount of overlap between the slit forming blade and the cover blade when the blade that closes the shutter opening is deployed However, there was a disadvantage that it was difficult to maintain the size, and it was not possible to greatly reduce the size. On the other hand, when the rear blade of the four-blade configuration is used in common for the front blade, as shown in FIG. 20, the overlapping amount of each blade when the rear blade is deployed 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 shutter opening is opened, similar to the above-described five-bladed blade, the arrangement of the blade caulking dowels is narrowed down while keeping the arrangement of the blades straight, and the space of the blade caulking dowel is reduced. Due to the restriction of the arrangement, the degree of freedom of the rotatable support position of the covering blade is reduced, and the interference in the blade unit (for example, in FIG. 19, the outer periphery of the main part of the first arm 114 and the second around the caulking dowel 117d of the blade). Arm 115 and covering blade 11
Interference with the outer circumference of No. 3, the first around the blade caulking dowel 116d
Interference between the outer circumference of the arm 114 and the outer circumference of the second arm 115 and the outer circumference of the covering blade 112 around the blade caulking dowel 117c), and is spread only about 1 mm further to the opposite side to the blade running direction, so that the desired 4 mm blade overlap. In addition to being unable to secure a sufficient amount, it was not possible to reduce the size. (See below for a description of the placement of the wing caulking dowels.)

Further, the second conventional example (Japanese Utility Model Publication No. 6-26896)
Japanese Patent Application Laid-Open No. H11-157,197), since a third arm for supporting the covering blade group is added, the structure becomes more complicated and the operating resistance increases as compared with a general parallel link mechanism having two arms as in the first conventional example. However, the inertia of the blade unit is 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 supporting the slit forming blade are accommodated in the storage portion area existing between the finder and the opening window, the connection distance of the parallel link on the slit forming blade is reduced. As a result, 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, the third arm (auxiliary arm) for supporting the covering blade group is added similarly to the second conventional example, so that the general parallel link mechanism with two arms 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.

[0015] Further, the above-mentioned fourth conventional example (actual number 2501747)
No. 3), one blade unit is provided with two parallel link mechanisms, and the third arm (and the fourth arm
Arm), the structure becomes more complicated than that of a general parallel link mechanism using two arms as in the first conventional example, the operating resistance increases, and the inertia of the blade unit increases. Was. 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.

Therefore, the second to fourth 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 is realized, and a 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 present invention is to reduce the size, especially in the direction perpendicular to the blade traveling direction, to reduce the size of the blade, to secure the overlapping amount of 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.

[0018]

The invention according to claim 1 is
A shutter device including a substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and an arm member connected to the blade group and rotatable with respect to the substrate. , A distance D from a connection portion of the connection portion with the blade farthest from the rotation center of the arm member to a rotation center of the arm member.
And the relationship between the shutter opening and the dimension A of the shutter opening in the blade running direction is 0.78A ≦ D ≦ 0.90A.

According to a second aspect of the present invention, there is provided a substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and a blade group connected to the blade group. When the blade group opens and closes the shutter opening, the maximum rotation angle θ of the arm member is set to 80.
° ≦ θ ≦ 94 °.

According to a third aspect of the present invention, there is provided a substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and a blade group connected to the blade group, respectively. A shutter device having first and second arm members forming a parallel link by rotating the first arm member and the second arm member.
The relationship between the link spacing dimension E with the arm member and the dimension A of the shutter opening in the blade traveling direction is 0.33A ≦ E ≦ 0.39A.

[0021]

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, 1 is a substrate having a shutter opening (hereinafter referred to as a shutter base plate), 1a is a shutter opening, and 1b is a not-shown leading blade driving lever (providing running energy to the leading blade by a spring force or the like). A long hole for escaping the travel trajectory of the drive pin of the lever) and a long hole for escaping the travel trajectory of the drive pin of the rear blade drive lever (not shown) that imparts travel energy to the rear blade by spring force or the like. Reference numeral 2 denotes a leading blade slit forming blade (# 1 blade) 2a
Is a leading blade slit forming end, 3 to 5 are leading blades, 3 is a leading blade # 2, 4 is a leading blade # 3, 5 is a leading blade # 4.
Reference numeral 6 denotes a first arm for the front blade, which is rotatably pivoted around an axis 1d provided on the shutter base plate 1, and which is provided with a caulking dowel 8a provided at the tip end of the arm to form the first blade slit forming blade 2 into an arm. 6 is rotatably supported. Also 6a
Is a hole into which a drive pin of a not-shown front blade drive lever is fitted, through which power can be transmitted from a not-shown front blade drive lever provided with a rotating shaft coaxially with the shaft 1d. Reference numeral 7 denotes a second arm for the front blade, which is rotatably pivoted around an axis 1e provided on the shutter base plate 1, and is provided with a caulking dowel 9a provided on the tip side of the arm to form the front blade slit forming blade 2.
Is rotatably supported on the arm 7.

In this manner, the leading blade slit forming blade 2
The first arm 6 and the second arm 7 for the front blade form a parallel link. Similarly, among the leading blades, the # 2 blade 3, the # 3 blade 4, and the # 4 blade 5 are provided at the intermediate portions between the first arm 6 and the second arm 7 for the leading blade, respectively, by swaging dowels 8b, 9b, and 8c. And 9c, 8d and 9d so as to be rotatable to form parallel links. Thus, the leading blade is configured.

The rear blades have the same construction as the front blades, 10 is a rear blade slit forming blade, 10a is a rear blade slit forming end, 11 to 13 are rear blades, and 11 is rear blades # 2 and 1 in order.
Reference numeral 2 denotes a rear blade # 3, and reference numeral 13 denotes a rear blade # 4. Reference numeral 14 denotes a first arm for the rear blade, which 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 tip side of the arm to form the rear blade slit forming blade 10a.
Is rotatably supported on the arm 14. Also 14a
Is a hole into which a drive pin of a rear blade drive lever (not shown) is fitted, and power is transmitted from a rear blade drive lever (not shown) provided with a rotary shaft coaxially with the shaft 1f through this hole.

Reference numeral 15 denotes a second arm for the rear blade, which is rotatably pivoted around an axis 1g provided on the shutter base plate 1, and is provided with a caulking dowel 17a provided on the tip side of the arm to form a rear blade slit forming blade. 10 is rotatably supported on the arm 15. Thus, the rear blade slit forming blade 1
0 and the first arm 14 and the second arm 15 for the rear blade form a parallel link. Similarly, of the rear wing #
The two blades 11, the # 3 blade 12, and the # 4 blade 13 are respectively provided at intermediate portions between the first arm 14 and the second arm 15 by swaging dowels 16b and 17b, 16c and 17c, 16d and 17d.
It is rotatably supported at d and forms a parallel link. Thus, the rear blade is configured.

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

In the running completion state shown in FIG. 1, the leading blade drive lever and the trailing blade drive lever (not shown) are held by a time control magnet (not shown).

When the suction of the time control magnet for the front blade is first released by the shutter release signal, the front blade driving spring (not shown) generates a clockwise turning force on the front blade driving lever, and the front blade driving spring exerts a force. Rotates the first arm 6 and the second arm 7 clockwise. Accordingly, the leading blade slit forming blade 2 and the leading blades # 2 blade 3, # 3 blade 4, and # 4 blade 5 are operated by a parallel link to form the leading blade slit forming end 2a with respect to the long side 1h of the shutter opening 1a. And, while keeping the # 2 blade 3, the # 3 blade 4, and the # 4 blade 5 in parallel, the shutter opening 1a is moved downward from above to open the shutter opening 1a. In this way, the leading blade moves to the position shown in FIG. 2 so as to open the shutter opening 1a.

After a predetermined time corresponding to the set exposure time, after the suction of the front blade time control magnet is released, the suction of the rear blade time control magnet is released, and the rear blade drive lever is turned clockwise. The rear blade is driven clockwise by the force of a rear blade drive spring (not shown) for generating
Arm 14 and the second arm 15 are rotated. Along with this, the rear blade slit forming blade 10 and the rear blades # 2 blade 11, # 3 blade 12, and # 4 blade 13 are operated by the parallel link to form the rear blade slit forming end 10a with respect to the long side 1h of the shutter opening 1a. And # 2 blade 11, # 3 blade 12,
While keeping the # 4 blades 13 in parallel, the blades move from above to below the shutter opening 1a so as to cover the shutter opening 1a. In this way, the rear blade moves to the position shown in FIG. 2 so as to cover the shutter opening 1a, and the exposure ends.

When charging the shutter, the leading blade and the trailing blade are moved backward by the charging mechanism (not shown) without opening the shutter opening 1a by moving the leading blade forward. An operation of turning the blade drive lever in a counterclockwise direction is performed, and the front blade and the rear blade are moved from the position shown in FIG. 2 to the position shown in FIG. 1 again.

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 rotation center of the arm backbone to the rotation center 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 rotation center of the backbone of the arm is θ, and the first arm and the second Let E be the dimension between the first and second arms of the parallel link formed by the arms.

Here, points of interest for miniaturization will be described.

The number of blades rotatably supported by the arm The number of blades is four in each of the front and rear blades of the first embodiment, while the number of blades is five in the arm as in the first conventional example. When supported, the camera has been fully charged for winding up (in recent motor-equipped cameras, wait for the next image in this state)
In the first embodiment, a predetermined blade overlap amount required for light shielding when the front blade closes the shutter opening (4 mm as shown in FIG. 1 in the first embodiment, and as shown in FIG. 19 also in the first conventional example) Under the condition of 4 mm), the width of one blade can be made smaller with five blades. If this is the case, 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 vertical dimension corresponding to the blade group traveling direction of the shutter is reduced.

However, simply as the number of blade groups increases, the arm length increases due to the increase in the number of blade support points, so that the size in the shutter lateral direction orthogonal to the blade group traveling direction increases. Further, when the arm length is made as small as possible (the first conventional example corresponds to this), the margin in the arm is reduced by the increase in the number of blade support locations, so that the dimension in the shutter lateral direction is further reduced. It becomes difficult. In addition, the overlap between the blades is one more in the case of five blades than in the case of four blades, the total blade area is larger, and one more blade support is added, so that the inertia of the whole blade unit is surely increased. It is disadvantageous for high-speed driving.

On the other hand, in the case of three blades, the number of blade support 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, a shield that secures a predetermined blade overlap amount (for example, 4 mm) when the blade group with the shutter opening closed is unfolded in a state where the shutter group is stored with the shutter opening open. The vertical dimension becomes larger. If an attempt is made to reduce the size in the vertical direction, the amount of overlap between the blades during deployment of the blade group is reduced, and light-shielding properties 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, to achieve a good balance of the vertical and horizontal dimensions of the shutter, and to effectively reduce the horizontal dimensions, as in the first embodiment,・ A four-blade configuration is optimal for both rear blades.

Arm length (dimension D from center of rotation of arm trunk to center of rotation of swaging dowel supporting slit forming blade at tip of arm) A group of four blades is rotatably supported, and shutter opening 1
The longitudinal dimension A of a is aimed at a minimum length such that the slit forming blades 2 and 10 can move sufficiently.

The maximum arm operating angle θ about 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 of the dimensions E between the first and second arms is as follows. When the maximum operating angle θ of the arm becomes large, if the dimension between the arms remains 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.

Secondly, 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, the first and second
The dimension E between the 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.

When 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 1 a 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.

FIG. 3 and FIG. 4 are views for explaining the effect of the arrangement of the blade supporting portion 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 front and rear blades have the same structure, only the rear blade is shown in the description.

In these figures, 10b is the end of the slit forming blade 10 on the side of the main part of the arm of the slit forming blade 10, and 18 (indicated by a two-dot chain line) is the # 3 blade 12 that has been conventionally arranged.
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 arrangement of the blade supporting portion (blade caulking dowel) on the arm is such that the rear blade of the four-blade configuration has the rotation center (101f, 101f,
101g) and the slit forming blade support portion (1
16a, 117a) When viewed from the distance from the line connecting the rotation centers, 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 case of the five-blade front blade, similarly, when viewed from the line 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 distance of the blade is Of the support part rotation centers, the support part (108c, 109c) rotation center of the # 3 blade is the farthest (the distance is g in the figure), and in the following order for # 2 blade, # 4 blade, and # 5 blade It is.

As described above, in order to effectively reduce the lateral dimension of the shutter, a four-blade configuration is optimal for both the front and rear blades. When the blade supporting portions are arranged 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, the end 10b of the slit forming arm 10 on the side of the slit forming arm interferes with the caulking dowel 18 for the # 3 blade. It must be moved about 1.5 mm to the tip of the blade as in 10b '. Then, the slit forming portion arm main body side end 10
The movement trajectory of the outermost shape of b 'is indicated by H, and enters the shutter opening 1a, so that a 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. Not only this, but also the arm-side light-shielding piece 11a of the # 2 blade 11 interferes with the caulking dowel 18 for the # 3 blade, so the light-shielding piece 11a must be released.

For example, as shown by hatching in FIG.
When the blade 1a is deleted, as shown in FIG.
And a gap formed between the arm-side light-shielding piece 12a of the # 3 blade 12) and the shutter function cannot be realized. In this case, it is not necessary to make the lateral dimension of the shutter larger than that of the first embodiment by about 1.5 mm, and the lateral 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.

Thus, the horizontal 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, and 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, the further reduction in the B dimension causes the arm end of the slit forming portion of the slit forming blade to enter the inside of the shutter opening. A rectangular slit formed by the slit forming portion of the blade 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, the 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 trunk of each arm of the leading and trailing blades is reduced by 0.3 mm. Accordingly, the shutter base plate end face on the left side in FIG. 1 can be shifted to the right. The size reduction of 2 mm from the first conventional example is the upper limit of the B dimension, and 0.3 mm from the first embodiment.
Since miniaturization of mm is the lower limit of B dimension, 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 of the above formula (1) Thus, the dimension B can be freely selected by the technique of the present invention.

Next, the dimension C is 7.7 mm in the first conventional example shown in FIGS. 19 and 20, and if the minimum size at which a reduction in size is felt at all is 0.3 mm, the upper limit dimension is 7.4 mm. C
Since the dimensions are almost determined by the tip trajectory of the slit forming blade,
As described above, as in the present invention, the arm length D
When the arm maximum operating angle θ is increased, the amount of displacement of the blade group (particularly, the slit forming blade) in the direction perpendicular to the running direction due to the opening / closing operation increases, which is disadvantageous in reducing the dimension C. However, in the shutter that is reduced in size by the technique of the present invention and is close to the optimal balance (first embodiment), the C dimension can be set to 6.7 mm.

In order to further pursue the limit of miniaturization, if the slit forming portion corner R on the tip side of the slit forming blade is made as small as possible (almost zero) and the slit forming portion is provided almost to the tip of the blade, the slit forming blade can be provided. The tip length can be reduced by another 0.7mm. The tip of the blade other than the slit formation is also cut down by about 0.7 mm, and the lower limit of the C dimension is 6.0 mm. 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 tip of each blade and the shutter base plate 1 around the shutter opening 1a.
Alternatively, the amount of engagement with the cover plate cannot be secured even to the minimum necessary for securing light-shielding properties and preventing the blades from coming off when pressed by the photographer's carelessness.

Accordingly, 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, the dimension D is 23.0 mm in the first conventional example shown in FIGS. 19 and 20, and corresponds to the case where the dimension B is reduced by 2 mm from 19.2 mm in the first conventional example. Using the technique of the present invention, FIG. 5 is a diagram showing the balance between the arm of the leading blade and the slit forming blade with respect to the main plate size and the inclination of the slit forming portion in a traveling completed state. 'Is the state where the slit forming blade has 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 rear blade, so that the D dimension is 22.2 mm.

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 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, which would otherwise interfere with each other, are made thinner to increase the escape amount, the diameter of the swaging blade is reduced, and the light near the arm is shielded. This is possible by alleviating the constraint on the shape of each blade such as a piece and reducing the amount of overlap between adjacent blades when the blades are deployed to a minimum. FIG. 6 (a diagram showing the balance between the arm of the front blade and the slit forming blade with respect to the main plate size and the running completed state schematically showing the inclination of the slit forming portion. 2 ′ indicated by a two-dot chain line indicates that the slit forming blade is the most. Reference numeral 2 ″ indicates a state in which the slit forming blade has moved to the traveling preparation completed position. The same applies to the rear blade. In addition,
If the D dimension is smaller than this, it becomes difficult to support each blade in terms of space, and if the arm shape is further narrowed or if the diameter of the blade caulking is reduced, the arm strength and the blade caulking strength become too low, resulting in failure. You. 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 D dimension range of the above-mentioned formula (3), it is free according to the technology 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 completed state to the traveling preparation completed state is 74 ° to 75 °, and the overcharge is up to 4 ° (measuring the charging mechanism (not shown by the individual 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 case of the shutter which is reduced in size according to the technology of the present invention and is close to the optimum balance (first embodiment), θ is 87 °.
+ (Overcharge 0 ° ~ 4 °), and further pursuing the limit of miniaturization, as shown in FIG.
Is 90 ° + (overcharge 0 ° to 4 °) corresponding to.

Accordingly, θ is expressed 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.

When θ is increased in this manner, the driving pins of the front blade driving lever and the rear blade driving lever (not shown) that give running energy to the front blade and the rear blade by spring force and the like are connected to the first arm 6. The positions (6a, 14a) to be fitted and engaged with the and 14 are limited. That is, the front and rear blade drive levers are connected to the rotation centers 1d and 1f of the first arms 6 and 14, respectively.
When the turning radius of the drive pin is increased, the larger the θ, the wider the area occupied by the drive pin operation trajectory, and the degree of freedom in the arrangement of the blades is reduced, which is disadvantageous for miniaturization. Therefore, it is required to minimize the turning radius of the drive pin. Moreover, 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 overcharged state after the completion of the running of the front blade and the completion of the charging of the rear blade 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 frictional force without using a sprocket for a film feeding mechanism.
Indexing of the film screen is now performed by the photo sensor instead of detecting the rotation amount of the sprocket. Therefore, according to the shape of the sprocket conventionally existing on the left side of the shutter across the wall of the camera body (not shown),
Escapes are provided above and below the left end of the shutter base plate from a certain area (101i and 101j in FIGS. 19 and 20).

In the first embodiment of the present invention, noting that there is no need 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 blade and the charging completion of the rear blade are completed. The position of each drive pin in the overcharged state (the same position as 6a in FIG. 2 and 14a in FIG. 1) is set to the rotation center 1d of the first arm 6,14.
The front blade 1f is close to the left end of the shutter base plate 1 so that the front blade is right below and the rear blade is right above.

Next, the dimension E is 8.06 mm in the first conventional example shown in FIGS. 19 and 20, and the parallelism of the slit forming portion at this time is determined by the inclination angle of the slit forming portion and the slit forming portion (linear portion). ) Are expressed as the distances in the blade running direction (vertical direction in the figure) at both ends. The condition is that the rotating shaft of the arm backbone (101
d, 101e, etc.), there is no backlash, and the arm caulking dowel that supports the slit-forming blades on the arm is fitted with hole H8-shaft f8 class, and the maximum play is 34 μm for a diameter of φ1.5 mm.
And The results are shown in FIG. 9 (a diagram of the running completion state schematically showing the balance between the arm of the leading blade and the slit forming blade with respect to the main plate size, and the inclination of the slit forming portion, and the same applies to the trailing blade, which 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 maximum arm 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 showing the balance between the arm of the leading blade and the slit forming blade and the inclination of the slit forming portion with respect to the main plate dimension of the shutter according to the first embodiment, in a traveling completed state. 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 (1). It is slightly better than the one.

If the E dimension is kept at 8.06 mm as before with the shutter (first embodiment) reduced in size by the technique 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 is deteriorated. After all, it can be seen that it is appropriate to increase the E dimension up 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 trunk of each arm of the leading and trailing blades is reduced by 0.3 mm. As a result, the leading blade and the trailing blade in FIG. 1 can approach 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 blades in the vertical direction are One arm can move 0.8mm.

Therefore, when combined, the E dimension becomes 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. If the E dimension is larger than this, the viewfinder eyepiece optical path of the camera is affected, and the vertical dimension of the shutter becomes undesirably large.

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-mentioned formula (5), it is free 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 distances E between the first and second arms of the parallel link formed by the first arm and the second arm is (1)
Although it is described that selection is possible within the range of Expressions (5) to (5), FIGS.
As shown in FIG. 7, there is an appropriate (balanced) combination between the respective dimensions. The main factors of the miniaturization are the D dimension and θ, and the E dimension adjusts the interference of the blade support portion and maintains the parallelism of the slit forming blade.
The dimension is a dimension guided by D, θ, and E.

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 simplified and thinned. 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. 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 negative film of IX240 film (hereinafter referred to as a D-cart 322) into the image display device 321, the photographing screen becomes negative or positive. 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. . Three
Numeral 24 denotes a milky white diffusion plate, which is a strobe device 3 described later.
The light emitted from the film 25 is uniformly diffused, and the negative film 3
23 is configured to be illuminated. Reference numeral 325 denotes a strobe device such as that used in cameras and the like.
It comprises a tube, a reflector, a light emitting circuit, etc., and emits light in response to a trigger signal from a known microprocessor (not shown). Reference numeral 326 denotes an orange base removal filter that serves to remove the orange base color from the negative image, and is constituted by an optical filter that has a blue color that is a complementary color of orange.

A projection lens 327 projects a 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. 12A shows the configuration of the SLM 329 when writing an image, and FIG. 12B shows the configuration of the SLM 329 when observing an image.

Reference numeral 329a denotes a pure or complementary color filter, 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. 329b and 329h are polarizing plates sandwiching a liquid crystal layer to be described later. In the configuration of FIG. 12, 329b has a polarization direction which is opposite to the paper surface and 329h has a horizontal direction which is a so-called cross Nicol configuration. ing. 329c and 329f are transparent conductive films (hereinafter referred to as ITO films) which are usually made of indium oxide or the like, and the AC power supply 330 and a circuit (not shown) for driving the AC power supply 330 are different from the respective ITO films 329c and 329f by the SW 331. It is configured to generate a polar potential. Reference numeral 329d denotes a photo-con layer, which is formed of an amorphous film or a photodiode layer made of an OPC (organic semiconductor film) or the like, one surface of which is in close contact with the ITO film 329c, and the other surface of which is described later.
Close contact with LC329e. 329e is a liquid crystal layer FL
At C, one surface is brought into close contact with the photo-con layer 329d as described above, and the other surface is brought into close contact with the above-mentioned ITO film 329f. 329 g is glass, which not only seals the liquid crystal layer but also protects other layers. Three
Reference numeral 29j denotes a negative film image depicting a virtual image of a pixel of the negative film 323 projected by the above-described projection lens 327 for the purpose of 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 is rotatably pivoted around a shaft 301d provided on the shutter base plate 301, and is provided with a caulking dowel 308a provided on the distal end side of the arm.
Is rotatably supported on the arm 306. Also 30
Reference numeral 6a denotes a hole into which a driving pin of a driving lever (not shown) is fitted, and power is transmitted from a driving lever (not shown) provided with a rotating shaft coaxially with the shaft 301d through this hole. The drive lever (not shown) is configured to transmit the power generated by the motor 333 via a gear train 334 (simply indicated by a two-dot chain line in FIG. 11).

Reference numeral 307 denotes a second arm, which is a shutter base plate 3
The first blade 302 is rotatably pivoted about a shaft 301 e provided on the arm 01, and the first blade 302 is rotatably supported on the arm 307 by a caulking dowel 309 a 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 that is turned on when the blade unit 340, which is a light-shielding means, completely shields 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, each switch (not shown)
Into the standby mode to wait for a signal from
3).

Here, when a signal such as a signal from a remote controller or the like that advances the screen to a certain frame is input (S104), the designated frame is brought to the aperture unit 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. In other words, the operation described below (erasing the previously displayed frame image and writing a new image) is performed by the light shielding unit 340 by the image display device 321.
In order to perform the operation in a state where the shutter opening 301a is completely shielded from light, 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, switch SW3
31 and turns off the lighting means 332 (S113, S11
Four).

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

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 in 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, first, the motor 333 is used.
Is rotated forward (S130). Then, the blade arm 306 rotates counterclockwise around the shaft 301d via the gear train 334, 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 means 341 linked with the light shielding means 340 releases the covering so as to enable writing to the SLM from the state where the SLM 329 is covered, and the light shielding means 340 completely closes the shutter opening 301a of the image display device 321. When light is blocked, the light-blocking state detection switch 339a is switched from OFF to ON at substantially the same timing. Therefore, the control means 3
35 detects that the light shielding means 340 completely shields the shutter opening 301a of the image display device 321 from light (S
131), a signal for stopping the rotation of the motor is output from the control means 335 to the motor control means 336,
Stops rotating (S132).

This subroutine ends here.

"Opening the light shielding means" (refer to the flowchart in FIG. 18). In order for the light shielding means 340 to completely release the light from the shutter opening 301a of the image display device 321, 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 determines that the light shielding means 340 is the shutter opening 301a of the image display device 321.
Is detected (S141), a signal for stopping the rotation of the motor is output from the control means 335 to the motor control means 336, and the rotation of the motor 333 is stopped (S142).

This subroutine ends here.

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 has occurred 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, conventionally, in order to obtain a clear image, a device that 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 suppressed. Thus, the image display device 321 can be made compact. Also,
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. In addition, a significant 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 trunk (left side in FIG. 13) from the end surface of the arm opening 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. . Further, the dimension from the rotation center of the arm backbone to the rotation center of the swaging dowel supporting the first blade at the tip of the arm is D, the maximum operating angle of the arm around the rotation center of the backbone of the arm is θ, and the first arm and the second Let E be the dimension between the first and second arms of the parallel link formed by this arm.

Note that the outer shape of the shutter device shown by a two-dot chain line in FIGS. 13 and 14 represents a case where a conventional blade unit is used, and the second embodiment uses the same technology as the first embodiment. The shutter device is 18mm wider than before
Is also smaller.

Points of interest for the downsizing of the shutter device (including the arrangement of the blade support portion (blade caulking dowel) on 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 D dimension and θ, E dimension adjusts the interference of the blade support and maintains the parallelism of the slit forming blade, and B dimension and C dimension are the dimensions guided by D, θ, and E. Becomes

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.

Further, 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 not required. The driving mechanism is simple and thin, and the image display device can be downsized.

[0122]

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. This has the effect of reducing the size of the shutter, especially the size in the direction perpendicular to the blade running direction.

[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 technique of the first embodiment of the present invention, schematically showing the balance between the arm of the leading blade 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 another example of the focal plane shutter using the technology of the first embodiment of the present invention, schematically showing the balance between the arm of the front blade and the slit forming blade and the inclination of the slit forming portion with respect to the main plate size. FIG.

FIG. 7 is a front view of the traveling completed state schematically showing the balance between the arm of the front blade 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.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate with shutter opening (shutter base plate) 1a Shutter opening 2 Front blade slit forming blade 3, 4, 5 Front blade 6 Front blade first arm 7 Front blade second arm 8a-d Front blade caulking dowel 9a-d Blade caulking dowel 10 Rear blade slit forming blade 11, 12, 13 Rear blade 14 Rear blade first arm 15 Rear blade second arm 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 307 second arm 308a-d caulking dowel 309a-d caulking dowel

Claims (9)

[Claims] 1. A substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and an arm member connected to the blade group and rotatable with respect to the substrate. A distance D from a connection portion of the connection portion with the blade farthest from the rotation center of the arm member to a rotation center of the arm member, and a blade traveling direction of the shutter opening. Wherein the relationship with the dimension A is 0.78A≤D≤0.90A. 2. A substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and an arm member connected to the blade group and rotatable with respect to the substrate. And wherein the maximum rotation angle θ of the arm member is set to 80 ° ≦ θ ≦ 94 ° when the blade group opens and closes the shutter opening. 3. A substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and a blade group connected to the blade group and rotating with respect to the substrate. In a shutter device having first and second arm members constituting a parallel link, a link interval dimension E between the first arm member and the second arm member and a dimension of the shutter opening in a blade traveling direction. A shutter device, wherein the relationship with A is 0.33A ≦ E ≦ 0.39A. 4. A substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and an arm member connected to the blade group and rotatable with respect to the substrate. A distance D from a connection portion of the connection portion with the blade farthest from the rotation center of the arm member to a rotation center of the arm member, and a blade traveling direction of the shutter opening. Is set to 0.78A ≦ D ≦ 0.90A, and when the blade group opens and closes the shutter opening,
A shutter device, wherein a maximum rotation angle θ of the arm member is set to 80 ° ≦ θ ≦ 94 °. 5. A substrate having a shutter opening, a blade group including a plurality of blades formed so as to open and close the shutter opening, and a blade group connected to the blade group and rotating with respect to the substrate. A shutter device having first and second arm members forming a parallel link, wherein, among the connection portions with the blade, the connection portion that is farthest from the rotation center of the first arm member is the first device. The relationship between the distance D to the rotation center of the arm member and the dimension A of the shutter opening in the blade running direction is 0.78A ≦ D ≦ 0.90A, and the first arm member and the second arm member A relationship between a link interval dimension E of the shutter opening and a dimension A of the shutter opening in the blade traveling direction is 0.33A ≦ E ≦ 0.39A. 6. A substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and a blade group connected to the blade group and rotating with respect to the substrate. In the shutter device having first and second arm members forming a parallel link, when the blade group opens and closes the shutter opening, the maximum rotation angle θ of the first or second arm member is set to 80 °. .Ltoreq..theta..ltoreq.94.degree., And the relationship between the link spacing dimension E between the first arm member and the second arm member and the dimension A of the shutter opening in the blade traveling direction is 0.33A.ltoreq.E.ltoreq.0. 39A. 7. A substrate having a shutter opening, a blade group including a plurality of blades formed to open and close the shutter opening, and a blade group connected to the blade group and rotating with respect to the substrate. A shutter device having first and second arm members forming a parallel link, wherein, among the connection portions with the blade, the connection portion that is farthest from the rotation center of the first arm member is the first device. When the relationship between the distance D to the rotation center of the arm member and the dimension A of the shutter opening in the blade traveling direction is 0.78A ≦ D ≦ 0.90A, and when the blade group opens and closes the shutter opening,
The maximum rotation angle θ of the first or second arm member is set to 80 ° ≦ θ ≦ 94 °, a link interval dimension E between the first arm member and the second arm member, A shutter device, wherein the relationship with the dimension A in the blade traveling direction is 0.33A ≦ E ≦ 0.39A. 8. The relationship between a dimension B from the end face of the substrate on the side where the center of rotation of the arm member is provided to an end face of the shutter opening and a dimension A of the shutter opening in the blade traveling direction is 0.56A. The shutter device according to any one of claims 1 to 7, wherein ≤ B ≤ 0.70A. 9. A relationship between a dimension C from an end face of the substrate on a side where the center of rotation of the arm member is not provided to an end face of the shutter opening and a dimension A of the shutter opening in the blade group traveling direction is 0. 9. The shutter device according to claim 1, wherein 24A ≦ C ≦ 0.30A.