JP2001021945A - Focal plane shutter for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focal planar shutter for a camera, constituted such that the arms of respective blade groups are made to suitably abut on a buffer member, when exposure actuation is finished. SOLUTION: A 2nd blade group is constituted of two arms 29 and 30, attached pivotally to shafts 1t and 1u of a shutter base plate 1 and four blades pivotally supported by the arms via a well-known coupling shaft. Then, an auxiliary member 35 is fitted to two pivotal support parts of the blade pivotally supported second from the pivotal attachment part side, and the abutting part 35a thereof is formed substantially identical to an abutting part 30e formed at the arm 30. Then, since two abutting parts 30e and 35a are made substantially simultaneously to abut on the buffer member 8 fitted to the shaft 1z of the board 1 when the exposure actuation is finished, an interval between two arms 29 and 30 becomes hard to be narrowed and the arms and the blades become hard to be deformed and broken at abutting times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a front blade group and a rear blade group sequentially in the same direction during photographing, and exposing the photosensitive surface by slits formed by slit forming blades of both blade groups. And a focal plane shutter for a camera.

[0002]

2. Description of the Related Art Most of recent focal plane shutters have two blade chambers formed by partitioning an intermediate plate between two ground plates, and the front blade group and the rear blade group are provided in the blade chambers. Are arranged, and at the time of photographing, a slit for exposure is formed between the slit forming blades of both blade groups. Each of the blade groups has substantially the same configuration. Basically, two blades are pivotally attached to one of the base plates at one side position of the exposure opening, and the other has a horizontally long shape. It consists of a plurality of blades that are pivotally supported by the two arms in order by one connecting shaft, and among those blades, the blade that is pivotally supported at the tip of the arm is slit-formed. I have feathers. Also, exceptionally, it is known that the arm has three or more arms, but even in that case, one blade is
Two of them are pivotally supported.

[0003] Each blade group has a large number of pivots as described above, and in each pivot, the arm and the blade are connected by fitting a shaft and a hole. . Therefore, since each of these fitting portions has a tolerance, if the exposure operation is performed in the same configuration, an extremely unstable operation is performed due to rattling of the fitting portions, and the slit formation is performed. Proper exposure control by the blade cannot be performed. Therefore, conventionally,
One of the arms is fitted with a torsion coil spring, which is commonly referred to as a rattling spring, to minimize the backlash due to the tolerance of each fitting part, thereby stabilizing the operation of the slit forming blade, Exposure control can be performed.

However, since each blade group is operated at a high speed during the exposure operation, and at the end thereof, the blade group collides with the stopper and is stopped, so that the impact causes the blade group to bounce, and the slit forming edge of the slit forming blade. May be momentarily re-entered into the exposure opening, and with the presence of the backlash spring, an excessive force from a complicated direction acts on the above-mentioned fitting portion, causing a large bulging phenomenon. This can cause the arms and blades to deform or break. Therefore, as a method of suppressing such a phenomenon, it has been conventionally known to bring each blade group into contact with a rubber buffer member at the end of the exposure operation. In this case, there are known one in which one of the arms is brought into contact with the cushioning member, one in which one or more blades are brought into contact with the cushioning member, and one in which they are used in combination. However, the present invention relates to a configuration in which an arm is brought into contact.

[0005]

By the way, at the end of the exposure operation, the arm which comes into contact with the buffer member is usually the arm closest to the exposure operation direction. Therefore, when the arm comes into contact with the cushioning member, inertia acts on the plurality of blades and other arms, so that a force acting to reduce the interval between the arms and flex the blades is exerted. Become. For this reason, if the blades are made too thin, the blades are deflected, causing an unreasonable force to be applied to each of the pivots, causing the blades and arms to deform or break. Therefore, this has been a major obstacle in increasing the speed of the shutter by thinning the blades.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is to provide an auxiliary member between two arms pivotally supporting a predetermined one blade. An object of the present invention is to provide a focal plane shutter for a camera that pivotally supports one of the arms and its auxiliary member at the same time when the exposure operation is completed, against the same buffer member.

[0007]

In order to achieve the above object, a focal plane shutter for a camera according to the present invention comprises:
Of the front blade group and the rear blade group arranged in each blade chamber formed by partitioning the two ground plates with the intermediate plate,
At least one blade group, a plurality of arms pivotally attached to one of the two ground plates, and a plurality of blades each of which is pivotally supported to predetermined two of the arms via a connection shaft, And an auxiliary member pivotally supported between the two arms via a connecting shaft. The auxiliary member and one of the arms pivotally supporting the auxiliary member have substantially the same contact shape. When the exposure operation is completed, the contact portions come into contact with the same cushioning member substantially simultaneously. In the focal plane shutter for a camera according to the present invention, the one blade group is a rear blade group, and then the blade group is urged toward a setting direction by a set spring. Is actuated by being pushed by the rear blade drive member, and is locked at the light blocking position of the exposure opening when the rear blade drive member is set, and immediately before the exposure operation, the exposure operation is started by the urging force of the set spring. By being operated to the position, a shutter of a suitable double light shielding system can be obtained. Further, in the focal plane shutter for a camera according to the present invention, if the auxiliary member is pivotally supported by two arms through a common connection shaft at a pivotal support portion of one predetermined blade, cost is reduced. Advantageously. Further, in the focal plane shutter for a camera according to the present invention, among the common connection shafts, at least one of the connection shafts located near the two contact portions is a rivet part, and the head of the rivet part is a rivet part. A contact portion having substantially the same shape as the two contact portions is formed, and at the end of the exposure operation, the three contact portions contact the same buffer member substantially simultaneously. Then, it becomes more effective.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to an embodiment shown in FIGS. In this embodiment, the present invention is applied to a focal plane shutter of a double light shielding system. FIG. 1 is a plan view of the set state viewed from the subject side, that is, the photographing lens side,
2 to 8 are plan views of components of the embodiment in a set state, and FIG. 9 is a partial left side view of FIG. FIG. 10 is an enlarged view of only the left portion of FIG. 1 because FIG. 1 shows the entire shutter and details are difficult to see, and a well-known front blade driving member, a rear blade driving member,
It is the top view which removed and showed the blade | wing of each blade group. 11 to 16 are plan views shown for explaining the operation of the embodiment.

First, the configuration of this embodiment is mainly described with reference to FIGS.
0, the lens side of each component is referred to as the front side, and the film side is referred to as the back side for convenience of description. FIG. 2 mainly shows the shutter base plate 1 of the present embodiment.
It is shown. The shutter base plate 1 is made of a synthetic resin, and has an opening 1a substantially at the center thereof.
Three arc-shaped long holes 1b, 1
c, 1d, and an escape groove 1e which has an arc shape similar to them, but which does not penetrate only through the back side. As is well known, cushion members 2 and 3 made of butyl rubber and having a C-shaped plane are attached to the lower ends of the long holes 1b and 1c. The shafts 1f, 1g, 1h, and 1i are provided on the front side of the shutter base plate 1.
Is erected. Among them, shafts 1f, 1g, 1h
The seat has a seat portion for each rotating member to be described later formed on the base side, and a small diameter portion formed on the tip end side. Further, screw holes 1h ₁ and 1i ₁ are formed in the tip surfaces of the shafts 1h and 1i.

A counterbore 1j is formed on the back side of the shutter base plate 1 so as to surround the opening 1a as is well known. Further, the right side of the opening 1a is formed as a thick portion 1k, and the front side is the same plane as the reference plane, but the back side is a plane raised from the reference plane. In addition, engaging portions 1k ₁ and 1k ₂ are formed at upper and lower positions on the right side of the thick portion 1k. And the opening 1a
On the back side of the upper and lower positions between the surface and the reference surface of the thick portion 1k a raised, inclined surface 1k _3, 1k ₄ are formed. In the upper left corner of the shutter base plate 1, two thick portions 1m and 1n having different thicknesses are formed on the rear side, and a rectangular parallelepiped cushioning member 4 is formed on the step surface of the thicker portion 1m. Are attached by an adhesive. Further, two shelves 1p and 1q are formed on the back side below the opening 1a, and rectangular parallelepiped cushioning members 5 and 6 are attached to their respective upper surfaces by an adhesive.

On the rear side of the shutter base plate 1, a shaft 1 is further provided.
r, 1s, 1t, 1u, 1v, 1w, 1x, 1y, 1z
Are set up, and among them, the shafts 1r, 1t, 1v
Are arranged concentrically with the shafts 1f, 1g, 1i erected on the surface side. The shaft 1w has a screw hole 1
w ₁ is formed. Actually, a screw hole is similarly formed on the tip end surface of the shaft 1v, but is not explicitly shown in the drawing because it overlaps with the shaft 1i. Further, annular cushioning members 7, 8 having a predetermined thickness are attached to the shafts 1w, 1z by an adhesive. Further, an annular groove is formed around the distal ends of the shafts 1x and 1y, and a spacer 1 is formed at the base of the shaft 1x.
x ₁ is formed.

Next, the components attached to the front side of the shutter base plate 1 will be described mainly with reference to FIGS. As already described, the axes 1f,
1g, the distal end portion of 1h have been small-diameter portion is formed, furthermore, the distal end surface of the shaft 1h, 1i is screw hole 1h _1, 1i ₁ are formed. Therefore, the support plate 9 (FIG. 3 (c)) is applied to the small-diameter portions in this order from the shutter base plate 1 side.
Holes 9a, 9b, 9c of the printed wiring board 10 (see FIG. 3B).
After 10c Mate, screws 11, 12 (see FIG. 3 (a)), the shaft 1h, so that screwed into the screw hole 1h _1, 1i ₁ of 1i.

The supporting plate 9 is formed with claws 9e and 9f, a spring hook 9g, and mounting portions 9h and 9i by bending. Although the mounting portions 9h and 9i have extremely complicated shapes, they are not directly related to the present invention, and therefore a detailed description of the specific configuration will be omitted. In addition, the mounting portions 9h and 9i include:
A front blade electromagnet 13 and a rear blade electromagnet 14 are attached to the shutter base plate 1 side, respectively. Each of the electromagnets 13 and 14 includes an iron core 13a and 14a and a coil 13b,
14b, and two terminals of each of the coils 13b and 14b are connected to the printed wiring board 10.

Between the shutter base plate 1 and the support plate 9, a shaft 1f is provided with a driving member 15 for leading blades, and a shaft 1g.
, A rear blade drive member 16 is rotatably attached to each. Ratchet wheels 17, 18 are rotatably attached to the small diameter portions of the shafts 1f, 1g. The driving member 15 for the leading blade (see FIG. 4C)
It is made of synthetic resin, and has a cylindrical portion 15a rotatably fitted to the shaft 1f, a drive pin 15b, and a mounting portion 15c. A roller 19 is rotatably mounted on the back side. I have. The drive pin 15b is connected to the shutter base plate 1
The iron piece member 20 is attached to the mounting portion 15c so as to be attracted to the iron core 13a of the electromagnet 13 for the leading blade. The specific configuration will be described later.

The cylindrical portion 15a of the leading blade drive member 15 includes:
The drive spring 21 for the leading blade shown in FIG. 4B is fitted as shown in FIG. 9, one end of which is hooked on a part of the mounting portion 15c, and the other end is the ratchet wheel 1
7 is hooked on a spring hook portion 17a (see FIG. 4A). However, the ratchet wheel 17 has its teeth 17b meshed with the claws 9e of the support plate 9 and is prevented from rotating counterclockwise in FIG. 4 (a). The front blade drive member 15 is urged to rotate clockwise in FIG. 4C. And
The adjustment of the biasing force can be performed by changing the meshing position of the pawl 9e and the ratchet wheel 17.

On the other hand, the rear blade drive member 16 (see FIG. 4 (c)) rotatably mounted on the shaft 1g is also made of a synthetic resin like the front blade drive member 15, and is made of the above-described shaft. It has a cylindrical portion 16a rotatably fitted to 1g, a drive pin 16b, and a mounting portion 16c, and a roller 22 is rotatably mounted on the back side. The drive pin 16b penetrates the long hole 1c of the shutter base plate 1, and projects on the rear side, the flat pressing surface 16b ₁ is formed on the projecting portion. Further, an iron piece member 23 that is attracted to the iron core 14a of the rear-wing electromagnet 14 is attached to the attachment portion 16c. The specific configuration of the iron piece member 23 is the same as that of the iron piece member 20 described above.
The configuration will be described later.

Also, the cylindrical portion 16a of the rear blade drive member 16
A drive spring 24 for the rear blade shown in FIG. 4 (b) is fitted on the first portion, and one end of the drive spring 24 is hooked on a part of the mounting portion 16c, and the other end is fitted on the spring hook portion 1 of the ratchet wheel 18.
8a (see FIG. 4A). However, the ratchet wheel 18 has its teeth 18 b formed on the claw 9 of the support plate 9.
4 (a) and is prevented from rotating counterclockwise in FIG. 4 (a).
In (c), the rear blade drive member 16 is urged to rotate clockwise. The adjustment of the biasing force is performed according to the case of the driving spring 21 for the leading blade described above.

Here, the two iron pieces 20, 2 described above are used.
The specific mounting configuration of No. 3 will be described. FIG. 11 shows the mounting configuration of the iron piece members 20 and 23 by cutting a part of the mounting portions 15c and 16c of the driving members 15 and 16 for easy understanding. That is, the iron piece member 20,
23 is an iron core 13a, 1 of each of the electromagnets 13, 14 described above.
4a, the iron pieces 20a, 23a, and the shaft 20
b, 23b and heads 20c, 23c, and are attached so as to be movable in the axial direction of the shafts 20b, 23b. Then, the iron pieces 20a, 23a are attached to the mounting parts 15c, 16 by the compression springs 25, 26.
It is urged toward the direction protruding from c.

A set member 27 shown in FIG. 4E is rotatably mounted on the shaft 1h between the shutter base plate 1 and the support plate 9. The set member 27 is made of synthetic resin, and has a cylindrical portion 27a rotatably fitted to the shaft 1h, and push portions 27b and 27c.
, A pushed portion 27 d, a spring hook portion 27 e, and a pin 27.
f. A return spring 28 shown in FIG. 4D is fitted on the cylindrical portion 27a of the set member 27 as shown in FIG.
e, and the other end of the spring plate 9g of the support plate 9 described above.
4 (e).
, Is urged to rotate counterclockwise. The rotation of the set member 27 by the return spring 28 is applied to the pin 2 inserted into the slot 1 d of the shutter base plate 1.
7f is stopped by contacting the right end surface of the long hole 1d.

In the setting member 27, the position where the pin 27f abuts on the right end surface of the long hole 1d and stops as described above is hereinafter referred to as an initial position. It is well known that such a pin 27f is provided on the set member 27 in order to stop the set member 27 rotated by the return spring 28. But,
In the present embodiment, the pin 27f is formed longer than the conventional pin, and extends to the blade chamber to participate in the double light shielding function. This can be understood from the configuration description of other members described later and the operation description of the embodiment.

With the above description, the explanation of the structure of the shutter base plate 1 itself and the members mainly attached to the front surface side of the shutter base plate 1 has been completed, and thereafter, the members attached to the back side of the shutter base plate 1 and the mounting structure thereof. First of all, regarding the overall configuration on the back side,
Let me explain. On the back side of the shutter base plate 1,
An intermediate plate 37 (see FIG. 6) and an auxiliary base plate 47 (see FIG. 8B) are attached at a predetermined interval, and a rear blade group (see FIG. 5A) is provided between the shutter base plate 1 and the intermediate plate 37. )reference)
The space between the intermediate plate 37 and the auxiliary base plate 47 is a blade chamber of the front blade group (see FIG. 7A). The intermediate plate 37 and the auxiliary base plate 47 are also formed with openings 37a and 47a at substantially the center, and by overlapping the opening 1a of the shutter base plate 1 with them, an exposure opening having a horizontally long rectangular shape is formed. Is formed.

Therefore, first, the rear blade group shown in FIG. 5A will be described. The rear wing group consists of two arms 2
9, 30; four blades 31, 32, 33, 34 pivotally supported in the longitudinal direction thereof, and two arms 29, 3
The blades 34, which are constituted by an auxiliary member 35 attached between the zeros and which are pivotally supported at the forefront, are slit forming blades. At one end of the auxiliary member 35, a contact portion 35a having a circular edge is formed. The pivotal configuration of the three blades 31, 33, 34 among the above-mentioned blades is such that the connecting shaft, which is a rivet component, is inserted from the arm side into a hole formed in the arm and the blade, By fixing the insertion end to the blade by swaging, the connecting shaft and the arm can be rotated relative to each other. Then, the two arms 29, 30 are arranged so as to be on the shutter base plate 1 side, and the arms 29, 3
From 0, the head of each circular connection shaft is the shutter base plate 1
It has a configuration that protrudes to the side.

However, the pivotal structure of the blade 32 is different from the pivotal structure of the other blades described above. First, the two connecting shafts are inserted into the respective holes formed in the auxiliary member 35. Then, the holes of the arms 29 and 30 and the blades 3
2 are inserted in the order of the holes, and their inserted ends are inserted into the blades 3.
2 Therefore, in the two pivots, the arms 29 and 30 and the auxiliary member 35
It can rotate individually with respect to those connection shafts.
However, although there are some difficulties in the adhesion between the blades 31 and the blades 32, the auxiliary member 35 is connected to the arms 29 and 30 and the blades 32.
The auxiliary member 3 may be disposed between the auxiliary members 3 by the caulking described above.
5 may be fixed to the connecting shaft together with the blade 32. Further, the blade 32 may be arranged between the arms 29 and 30 and the auxiliary member 35 and the connecting shaft may be swaged to the auxiliary member 35. In this case, the blade 3
2 may or may not be fixed to the connecting shaft.

Although the rear blade group of this embodiment has such a pivotal structure, the arms 29 and 30 themselves have unique shapes. That is, the arm 29 is a main arm of the rear blade group, and the hole 29 a is rotatably fitted to the shaft 1 t of the shutter base plate 1.
The driven portion 29b is formed, and the pressing surface 1 formed on the driving pin 16b of the driving member 16 for the rear blade already described.
6b ₁ can push the pushed portion 29b.

The other arm 30 is a slave arm.
So that the hole 30a can be rotated about the shaft 1u of the shutter base plate 1.
Arms fitted and extended substantially parallel to the direction of the tip
30b, a long groove 30 opened toward the tip.
c is formed. And at the tip of the arm 30b
Is in sliding contact with the pin 27f of the set member 27 already described.
The pin 27f is easily inserted into the long groove 30c.
Inclined surface 30b ₁Is formed. Also figure
In the state of FIG. 5A, the contact portion 35 of the auxiliary member 35
It overlaps with the back of a, so you can check its shape
Although it is not possible, the slave arm 30 is substantially
A contact portion 30e having the same shape is formed.

Another hole 30d is formed in the slave arm 30 of the rear blade group, and a set spring 36 shown in FIG. That is, the set spring 36 is fitted on the shaft 1 u of the shutter base plate 1, one end of which is hooked on the shaft 1 s of the shutter base plate 1, and the hook of the other end is hooked on the hole 30 d of the slave arm 30, whereby the slave arm is set. 30 is urged to rotate counterclockwise. With respect to the slave arm 30,
The application of the spring itself has been conventionally performed. However, the conventional spring is disposed only for the purpose of backlash of each pivot portion, but in the case of the set spring 36 of the present embodiment, in addition to the purpose of backlash, the following description will be given. As can be seen, the biasing force is set to be larger than in the case where only the backlash is performed, because it also has the purpose of operating the entire rear blade group to the exposure operation start position.
As shown in FIG. 9, a part of the hook hung on the hole 30d does not contact the shutter base plate 1,
It moves in the escape groove 1e.

When assembling such a group of rear blades to the shutter base plate 1, usually, the shutter base plate 1 is placed on a jig with its front surface side down.
With respect to the shafts 1t and 1u, the holes 29a,
30a is fitted from above. At this time,
It is also possible to design that the set spring 36 is fitted on the shaft 1u in advance, and one end thereof is hung from the shutter base plate 1 side to the hole 30d. However, there is a problem with such an arrangement.

That is, as described above, the arms 29, 30
Is the shutter base plate 1 more than the blades 31, 32, 33, 34.
On the side. Therefore, the pivoting portion of the slave arm 30 is separated from the shutter base plate 1 by the length of the coil portion (length of the axis) of the set spring 36, and the slave arm 30 is bent. Also, in order to prevent bending, the pivot portion of the main arm 29 is also separated from the shutter base plate 1 as in the case of the slave arm 30, and the planes of both arms 29, 30 are parallel to the surface of the shutter base plate 1. If the shutter is designed to be assembled, the interval between the shutter base plate 1 and the auxiliary base plate 47 must be increased accordingly, and the demand for downsizing the shutter cannot be met. Furthermore,
In the case of a double light shielding type shutter as in the present embodiment, as will be understood from the operation description described later, the slave arm 30 of the rear blade group and the slave arm 39 of the front blade group described later intersect. , The hook of the set spring 36 comes into contact with the slave arm 39 and the backlash spring 44, which is hooked on the slave arm 39, which will be described later.

Therefore, in order to prevent such a situation from occurring, the coil portion of the set spring 36 is left disposed on the auxiliary base plate 47 side, and the arm extending from the coil portion of the set spring 36 is provided. It is also conceivable to bend the part and draw it around to the shutter base plate 1 side, and hook the hook from the shutter base plate 1 side to the hole 30 d of the slave arm 30. However, in such a case, not only the manufacturing of the set spring 36 becomes complicated, but also the assembling work is obviously complicated.

Therefore, even in the case of the conventional spring provided only for the purpose of backlash, after the rear blade group is previously assembled to the shafts 1t and 1u, the backlash spring is fitted to the shaft 1u. The hook at one end is hooked on the hole 30d from the side opposite to the shutter base plate 1. That is, the hole 30
The hook of the backlash spring hung on d protrudes toward the shutter base plate 1 and comes into contact with the shutter base plate 1. Therefore, the set spring 3 of this embodiment is
Also in the case of No. 6, since it is still the backlash spring, it is assembled in the same manner as the conventional backlash spring. However, in the case of the present embodiment, since the escape groove 1e is formed in the shutter base plate 1, the hook of the set spring 36 does not contact the shutter base plate 1. Needless to say, the escape groove 1e of this embodiment may have a shape penetrating the front and back surfaces of the shutter base plate 1.

Further, as described above, this embodiment is an embodiment in which the present invention is applied to a shutter of a double light shielding system. Therefore, in this case, as will be understood from the operation description described later, at the time of the exposure operation, the urging force of the set spring 36 acts against the exposure operation, so that the urging force is larger than that of the normal backlash spring. However, it is not set to be too large. Therefore, if the hook of the set spring 36 comes into contact with the shutter base plate 1, the rear blade group may not be able to operate from the light blocking position to the exposure operation start position within a predetermined time. However, in this embodiment, such a situation does not occur because the shutter base plate 1 is not contacted at all as described above.

Next, the intermediate plate 37 will be described with reference to FIG. The opening 37a described above is formed substantially at the center of the intermediate plate 37, and two arc-shaped long holes 37b and 37c are formed on the left side of the opening 37a. Two holes 37d and 37e are formed on the right side, and three overhangs 37f, 37g and 37h are formed on the left side of the opening 37a. Among them, the long holes 37b and 37c are provided with the above-mentioned driving members 1 respectively.
5, 16 drive pins 15b, 16b are penetrated,
Thereby, in the case of the drive pin 15b, the intermediate plate 37
In the blade chamber on the rear side of the front blade group, it is possible to connect with a front blade group described later. In the case of the drive pin 16b, if the length is short, the driven portion 29b of the main arm 29 of the rear blade group may not be able to be reliably pushed. Is made to penetrate, so that it can be reliably pushed.

The holes 37d and 37e are for fitting to the shafts 1x and 1y of the shutter base plate 1. In this embodiment, the interval between the intermediate plate 37 and the shutter base plate 1 is maintained at several places. That is, since the four blades 31, 32, 33, and 34 of the rear blade group are superimposed on the position above the opening 37a,
And the required spacing, by contacting the edge of the hole 37d between seat 1x _1, and by contacting the protruding portion 37f in the thick portion 1n, which is obtained as the. In addition, the space below the opening 37a may be smaller than the space above the opening 37a. In the case of the present embodiment, the shelves 1p,
1q plays the role, and the shaft 1z of the shutter base plate 1 plays the role at a substantially central position on the left of the opening 37a. The overhanging portion 37g has an auxiliary base plate 47 to be described later.
The bent portion 47e of the shutter base plate 1 comes into contact with the protrusion 37h, and the protrusion (not shown) of the shutter base plate 1 comes into contact with the bent portion 47e, thereby suppressing the bending and displacement of the intermediate plate 37.

Further, the distance between the intermediate plate 37 and the shutter base plate 1 is not only the thickness of the blades 31, 32, 33, and 34 at the left side of the optical axis, that is, at the left side than the center of the opening 37a. It is necessary to consider the thickness of the arms 29, 30 and the amount of protrusion of the head of the connecting shaft for mounting each blade, but on the right side of the opening 37a, the blades 31, 3
The thickness is determined in consideration of only the thicknesses of 2, 33, and 34. For this reason, a member referred to as a rear blade pressing plate having a shape similar to the later-described front blade pressing plate 46 is normally arranged at the right side thereof to reduce the interval. In (2), since the thick portion 1k is formed on the shutter base plate 1, such a member is not provided.

The front blade group as shown in FIG. 7A is arranged on the back side of the intermediate plate 37 having the above-mentioned shape. The front blade group has exactly the same configuration as the conventional front blade group, and includes a main arm 38, a slave arm 39, and four blades 40, 4 pivotally supported by them via a well-known connecting shaft.
1, 42, and 43, and the blade 43 is a slit forming blade. The overlapping relationship is opposite to that of the rear blade group described above, and the main arm 38 and the slave arm 39 are connected to the blades 40, 41, 42, 43.
The head of each of the circular connecting shafts protrudes toward the auxiliary base plate 47 from the arms 38 and 39.

The main arm 38 has two holes 38.
a and 38b are formed, and two holes 3 are also formed in the slave arm 39.
9a and 39b are formed. And holes 38a, 3
9a is rotatably fitted to the shafts 1r and 1s of the shutter base plate 1, and the drive pin 15b of the leading blade drive member 15 is fitted to the hole 38b. Also, the backlash spring 44 shown in FIG.
Before being fitted to the shaft 1s, it is fitted to the shaft 1s, one end thereof is hung on the shaft 1u, and the hook at the other end is connected to the hole 3 of the slave arm 39.
9b, the slave arm 39 is urged to rotate counterclockwise. Therefore, although the tip of the hook of the backlash spring 44 is on the auxiliary base plate 47 side, it does not contact the auxiliary base plate 47 as will be understood from the following description. In addition, the backlash spring 44
Since it plays only a role of backlash, as can be seen from FIG. 9, it is made of a wire that is thinner than the set spring 36 described above.

Further, a spacer 45 shown in FIG. 7C is fitted to the shaft 1y of the shutter base plate 1 on the rear side of the intermediate plate 37. Next, FIG.
The holding plate 46 for the leading blade shown in FIG.
a, 46b are fitted to the shafts 1x, 1y of the shutter base plate 1. Then, each of the blades 40, 4 of the above-mentioned front blade group
The tip of each of the front blades 1, 42, and 43 is
And an intermediate plate 37. Among them, the spacer 45 is composed of the four blades 40, 41,
Reference numerals 42 and 43 are provided to secure an interval at which a superposed state can be obtained at a position below the exposure opening. The front blade pressing plate 46 serves the same function as the thick portion 1k of the shutter base plate 1. When the auxiliary base plate 47 described later is made of synthetic resin, the front blade holding plate 46 is used. A thick portion may be formed on the auxiliary base plate 47 instead of the holding plate 46.

FIG. 8B shows the auxiliary base plate 47 of this embodiment.
It is shown. The auxiliary base plate 47 is made of metal, and has the opening 47a described above formed substantially in the center. On the left side of the opening 47a, three holes 47b, 47c, 47d and three bent portions 47e, 47
f, 47g, an escape groove 47s, and a long hole 47t are formed. Of these holes 47c, the shutter base plate 1
Is a hole into which the tip of the shaft 1u is inserted.
47f and 47g are for maintaining a proper distance from the intermediate plate 37.

Of these, the bent portion 47e is
In contact with the overhang portion 37g of the intermediate plate 37, as described above, in cooperation with the protrusion (not shown) of the shutter base plate 1,
Intermediate plate 47 that is likely to be generated because it is not fixed
Is suppressed. The escape groove 47s is provided to prevent the hook of the backlash spring 44 from coming into contact. However, if the purpose can be achieved, even if the escape groove 47s is formed as a penetrated slot, It may be formed as a not-shown depression. Further, the elongated hole 47t is provided with the driving member 16 for the rear blade.
The driving pin 16b is adapted to insert the tip of the driving pin 16b so that a predetermined relationship with the main arm 29 of the rear blade group can always be reliably obtained in operation.

On the substantially right side of the opening 47a of the auxiliary base plate 47, two holes 47h and 47i having a keyhole on the side are provided.
Two hooks 47j and 47k and three protrusions 47
m, 47n, 47p and a bent portion 47q are formed. The protruding portions 47m, 47n, and 47p are for supporting the front blade pressing plate 46, and a rectangular parallelepiped buffer member 48 is attached to the bent portion 47q with an adhesive. Further, a bent portion 47r is formed below the opening 47a, and a long rectangular parallelepiped buffer member 49 is attached to the upper surface of the bent portion 47r by the same adhesive.

Next, how to attach the auxiliary base plate 47 will be described. As described above, screw holes are formed in the front end surfaces of the shafts 1 v and 1 w of the shutter base plate 1.
An annular groove is formed around the tip of x, 1y.
Therefore, first, the large openings on the left side of the holes 47h and 47i are fitted to the shafts 1x and 1y, and then the auxiliary base plate 47 is moved to the left, so that the edge of the small opening on the right side is described above. Insert into the annular groove. Then, in this state, the hole 47c is fitted into the shaft 1u, and the hook portions 47j,
Hooked 47k the engagement portion 1k _1, 1k _2. Then, the screws 50 and 51 shown in FIG.
d and screwed into the screw holes of the shafts 1v and 1w.

Next, the operation of this embodiment will be described. 1 and 10 show the setting state of the shutter. That is, the set member 27 is pushed by the pushed portion 27d by a member on the camera body side (not shown), and the return spring 28
After the camera is rotated clockwise against the urging force, the set position is maintained by the stop of the member on the camera body side. Therefore, the driving member 1 for the leading blade
5, the rear blade drive member 16 is rotated counterclockwise against the urging force of the front blade drive spring 21 and the rear blade drive spring 24 shown in FIG. , Iron piece portions 20a, 2 of iron piece members 20, 23 shown in FIG.
3a is brought into contact with the iron cores 13a and 14a of each of the electromagnets 13 and 14 (see FIG. 3C). The reason will be understood from the description of the setting operation described later.
0, 23 are compression springs 25, 26 shown in FIG.
And the iron pieces 20a and 23a are attached to the mounting portions 15c and 1
6c, slightly pressed into the other head 20c, 23
c is separated from the mounting portions 15c and 16c.

In this state, the driving pin 15b of the driving member 15 for the front blade is connected to the main arm 38 of the front blade group.
Is rotated counterclockwise, so that the four blades 40,
41, 42, and 43 are in a developed state, and completely cover the exposure opening. On the other hand, since the rear blade driving member 16 is also rotated counterclockwise as described above, the position of the driving pin 16b is moved accordingly.
As can be seen from FIG. 0, since the pin 27f of the set member 27 is in the long groove 30c of the slave arm 30 of the rear blade group,
The slave arm 30 cannot rotate in the counterclockwise direction due to the urging force of the set spring 36. Therefore, the main arm 2
9, the pushed portion 29b cannot follow the movement of the drive pin 16b, and the four blades 31, 32, 33, and 34 of the rear blade group.
Is a state in which the exposure opening is completely covered in the unfolded state.

Accordingly, in this set state, the exposure aperture is doubly covered by the blades 40, 41, 42, 43 of the front blade group and the blades 31, 32, 33, 34 of the rear blade group. Will be. At this time, the auxiliary member 35 of the rear blade group has a state in which the arc-shaped edge of the contact portion 35a is substantially overlapped with the arc-shaped edge of the contact portion 30e of the slave arm 30, Like the state immediately after the end of the exposure operation,
The contact portions 30e and 35a are used as the rear blade drive spring 2
Due to the urging force of 4, the peripheral surface of the cushioning member 8 is not being strongly pushed, but is in a state slightly apart from such a state. The reason can be understood from the description of the set operation described later. In FIG. 1, illustration of the auxiliary member 35 is omitted to make it difficult to see the drawing.

When the release button of the camera is pressed in such a setting state, first, the electromagnet 1 for the leading blade is pressed.
No. 3 coil 13b and coil 14b of rear-wing electromagnet 14
And the iron pieces 20 and 23 that have been in contact with the iron cores 13a and 14a are attracted and held by the magnetic force.
After that, a member on the camera body side (not shown) releases the pressing force of the pressed portion 27d of the set member 27,
The setting member 27 follows the urging force of the return spring 28 from the state shown in FIG. 10 and rotates counterclockwise toward the initial position.

As described above, when the set member 27 rotates counterclockwise from the state of FIG.
Of the slave arm 30 of the rear blade group
, And the pushing portions 27b and 27c of the set member 27 are separated from the rollers 19 and 22 of the driving members 15 and 16. Therefore, first, the slave arm 30 is rapidly rotated counterclockwise by the urging force of the set spring 36. As a result, the main arm 29 is also rotated counterclockwise, and the four blades 31, 32, 33, 34 of the rear blade group
It moves upward while increasing the amount of mutual overlap, and is stored at a position above the exposure aperture.

On the other hand, the leading blade driving member 15 and the trailing blade driving member 16 are rotated clockwise by the urging force of the leading blade driving spring 21 and the trailing blade driving spring 24. Are held by the electromagnets 13 and 14, and are stopped when their mounting portions 15c and 16c come into contact with the heads 20c and 23c of the iron piece members 20 and 23. Therefore, the rotation of each of the driving members 15 and 16 at this stage is slight, so that the blades 40, 41, 42 and 43 of the front blade group are slightly moved, but still cover the exposure opening. And
When the driving members 15 and 16 are substantially in such a state, the rear blade group described above operates and the main arm 2 is moved.
The pushing portion 29b of 9 abuts against the pressing surface 16b ₁ of the drive pin 16b of the rear blade driving member 16. Fig. 1
As shown in FIG. 1, at this time, the main arm 29 has not yet contacted the buffer member 4 and is in the middle of rotating counterclockwise.

By the way, needless to say, the set spring 3
6 is weaker than the biasing force of the rear blade drive spring 24. However, when the pushed portion 29b of the main arm 29 comes into contact with the drive pin 16b of the rear blade drive member 16, a large inertia acts on the rear blade group, so that the rear blade drive member 16 From the state of FIG. 11, the counterclockwise rotation is made against the urging force of the rear blade drive spring 24 and the compression spring 26. Then, the main arm 29 abuts on the cushioning member 4 and the four blades 31, 32, 33, 34
After the leading end of the rear blade abuts against the buffer member 48 (see FIGS. 1 and 8B) and the rear blade group stops, the rear blade driving member
FIG. 12 shows a state where the drive pin 6 operates and the drive pin 16b is in contact with the upper end of the long hole 1c. Therefore, in this state, the mounting portion 16 c of the rear blade drive member 16 is separated from the head 23 c of the iron piece member 23.

Thereafter, the rear blade drive member 16 is rotated clockwise by the urging force of the rear blade drive spring 24 and the compression spring 26. In the process, the drive pin 1
6b the pushing portion 29b of the pressing surface 16b ₁ is a main arm 29 of the
Press slightly. Immediately thereafter, the attachment portion 16c abuts on the head 23c of the iron piece member 23, and thereafter, the rotation of the blade drive member 16 is stopped. Also,
At this time, the slight rotation of the main arm 29 slightly moves the blades 31, 32, 33, and 34 of the rear blade group, but does not cover the exposure opening. The stationary state of the rear blade drive member 16 and the rear blade group in this manner is shown in FIG. 13, which is a state immediately before the start of the exposure operation. Therefore, the exposure aperture is covered only by the blades 40, 41, 42, 43 of the front blade group.

After such a state is obtained, first, the power supply to the coil 13b of the electromagnet 13 for the leading blade is cut off. Then, the holding force on the iron piece member 20 is lost, and the leading blade drive member 15 starts rotating clockwise by the urging force of the leading blade drive spring 21. Therefore, the drive pin 15b of the front blade drive member 15 rotates the main arm 38 clockwise, and the four blades 40, 41,
42 and 43 are operated downward. As a result, feather 4
0, 41, 42, and 43 increase the mutual overlapping amount, and the slit forming edge of the slit forming blade 43
Open the exposure aperture. Then, the slit forming blade 43
When the slit forming edge is at the stage where the exposure opening is completely opened, first, the driving pin 15 of the leading blade driving member 15 is driven.
b comes into contact with the cushioning member 2, then the base side portion of the main arm 38 comes into contact with the cushioning member 7, and finally, the edges of the four superposed blades in the operating direction come into contact with the cushioning member 49. Stop by. This state is shown in FIG.

As described above, when a predetermined time elapses after the energization of the coil 13b of the electromagnet 13 for the front blade is stopped, the coil 14b of the electromagnet 14 for the rear blade is
Is cut off. As is well known, actually, the timing at which the energization to the coil 14b is cut off varies depending on the imaging conditions. Therefore, rather than turning off the current to the coil 14b before the exposure operation of the front blade group is completed, the operation of the present embodiment is more often described. A case will be described where the energization is cut off after the exposure operation of the blade group is completed.

Therefore, the coil 14 of the rear blade electromagnet 14
b, the holding force on the iron piece member 23 is lost, so that the rear blade drive member 16
It is due to the urging force of the trailing blade driving spring 24 is rotated clockwise, but this time, pressing surface 16b ₁ of the drive pin 16b pushes the target pushing portion 29b of the main arm 29, the main arm 29, follow The arm 30 is rotated clockwise against the urging force of the set spring 36, and the four blades 3 of the rear blade group are rotated.
1, 32, 33, 34 are operated downward. for that reason,
The four blades 31, 32, 33, and 34 close their exposure openings by the slit forming edges of the slit forming blades 34 while reducing their mutual overlap.

Then, the four blades 31, 32, 33, 3
At the stage when the exposure opening is completely closed, the driving pin 16b of the rear blade driving member 16 first comes into contact with the buffer member 3 to absorb the impact at an instantaneous timing, and then,
The contact portion 30e of the slave arm 30 and the contact portion 3 of the auxiliary member 35
5a and 5a substantially simultaneously contact the buffer member 8 to absorb the shock, and finally, the slit forming edges of the slit forming blades 34 contact the buffer members 5 and 6, thereby absorbing the shock and stopping. Operation ends. Then, when the blade group is stopped, in this embodiment, an auxiliary member attached between the two arms 29 and 30 is used in the present embodiment, instead of having only the slave arm 30 abut the buffer member 8 as in the conventional case. Since the abutting edges having substantially the same shape are abutted together with the abutting portion 35, a predetermined rigidity is obtained at the abutting portions 30e and 35a, and the blade group is more suppressed in the flapping phenomenon than before. , Preferably stationary. The state immediately after the end of the exposure operation is shown in FIG.

In this embodiment, the contact portions 30e,
The contact edge of 35a is formed in an arc shape.
This corresponds to the outer shape of the buffer member 8, that is, the shape of the contact surface. In this embodiment, the contact area is increased in this way to increase the buffering effect, but the present invention is not limited to such a shape. That is, the contact edges of the contact portions 30e and 35a may be formed flat, and the shape of the buffer member 8 may be the same as that of the buffer member 4. In the present embodiment, the two contact portions 30
e and 35a are in contact with each other, but since the connecting shaft for attaching the arm 30 and the auxiliary member 35 is a rivet component, the head and two contact portions 30e and 35a have the same shape. If these three members are brought into contact with the buffer member 8 almost simultaneously, it is advantageous in terms of strength.

Next, the setting operation of this embodiment will be described.
In the state shown in FIG. 15, when the film is wound up, a member of the camera body (not shown) pushes the pushed portion 27 d of the set member 27 in conjunction therewith,
The set member 27 is rotated clockwise against the urging force of the return spring 28. Thereby, first, the pushing portion 27b of the setting member 27 pushes the roller 19 of the driving member 15 for the front blade, and the driving member 15 for the front blade is pressed against the urging force of the driving spring 21 for the front blade, Rotate clockwise. As a result, the drive pin 15b rotates the main arm 38 of the front blade group in the counterclockwise direction, so that the four blades 40, 41, 42, and 43 of the front blade group reduce the amount of mutual overlap. While being operated upward.

Then, the slit forming blade 43 of the front blade group
When the overlapping amount of the slit forming blades 34 of the rear blade group reaches a predetermined amount, the set member 27 further pushes the roller 22 of the rear blade driving member 16 by the pushing portion 27c, and the rear blade driving member 16 Is rotated counterclockwise against the biasing force of the rear blade drive spring 24. At this time, the slave arm 30 of the rear blade group is urged by the set spring 36 to rotate counterclockwise.
9 and the slave arm 30, the pushed portion 29 b of the main arm 29
While maintaining contact with the drive pin 16b pushes surfaces 16b ₁ and, to rotate counterclockwise f. However, at this time, since the pin 27f of the set member 27 has already moved within the operation path of the arm 30b of the slave arm 30, the slave arm 30 is slightly rotated, and the inclined surface 30b ₁ Will contact the pin 27f. FIG. 16 shows the state at that time.

[0057] Then, after that, with the rotation of the setting member 27, the pin 27f is pressing the inclined surface 30b ₁ of the arm portion 30b, the slave arm 30, setting spring 36
Is slightly rotated clockwise against the urging force of
f enters the long groove 30c of the slave arm 30. Therefore, in the case of the rear blade group, it is operated slightly in the set direction, but immediately thereafter, it is returned, but it is not returned to the state immediately after the end of the exposure operation. Therefore, in that state, as described above, the two abutting portions 30e and 35a of the rear blade group are slightly separated from the buffer member 8 and tend to be in a state of being slightly. As described above, at the time of the set operation, the driving member 15 for the front blade and the driving member 16 for the rear blade are set, and the four blades 40, 40 of the front blade group are set.
41, 42, and 43 are unfolded and cover the exposure aperture, but the four blades 31, 32, 33, and 34 of the rear blade group
It remains substantially covering the exposure opening.

Thereafter, the blades 40, 41, 4 of the first blade group
When 2,43 is in the unfolded state and covers the exposure aperture,
The iron pieces 20a and 23a of the iron pieces 20 and 23 come into contact with the iron cores 13a and 14a of the electromagnets 13 and 14 in succession, and resist the urging force of the compression springs 25 and 26, so that the mounting parts 15 and
c, 16c. At a stage where it is slightly pushed, the rotation of the set member 27 is stopped, thereby ending a series of set operations. Therefore, the set member 27 does not return to the initial position immediately after the end of the set operation, but is kept at that position by a member (not shown) on the camera body side until the next photographing is performed. . The set state is the state shown in FIG.

As can be seen from the description of such a setting operation, each of the driving members 15 and 16 is provided with a compression spring 2.
The reason that the iron pieces 20 and 23 are attached with the interposition of the iron pieces 20 and 23 is that the iron pieces 20 and 23 are simultaneously brought into contact with the iron cores 13a and 14a of the electromagnets 13 and 14 and at the same time, the set member This is because stopping the rotation of the 27 is extremely difficult in manufacturing.

As described above, the present embodiment is a shutter of the double light shielding system, but does not particularly increase the number of parts as compared with a conventional shutter without the double light shielding system.
The feature is that a compact and low-cost shutter can be obtained. That is, the pin 27f of the set member 27 is also used as a conventional pin for returning the set member 27 to the initial position and stopping, and the length thereof is only slightly increased. Also, the set spring 36 merely increases the urging force of the conventional backlash spring, and also serves as the backlash spring. Further, since the slave arm 30 only changes a part of the shape of the thin plate material like the conventional slave arm, the processing is extremely easy.

In the above-described embodiment, the set spring 36 is hung on the slave arm 30 and also serves as the backlash spring.
6 may be hung on the main arm 29 and a conventional backlash spring may be hung on the slave arm 30. In the above embodiment, the setting member 2
7 is configured to be moved from the initial position by a member on the camera body side at the time of setting, and to return to the initial position by the urging force of the return spring 28, but the present invention is limited to such a configuration. However, the present invention can also be applied to a configuration in which the return spring 28 is not hung on the set member 27, and the reciprocating operation from the initial position can be operated in conjunction with the reciprocating operations of other members. This means
The same applies to a shutter that does not employ the double light blocking method.

[0062] Further, in the above-mentioned embodiment, the set time of the operation, by the pin 27f of the setting member 27 presses the inclined surface 30b ₁ of the slave arm 30, watches the Supporting arm 30 is slightly rotated counterclockwise F Although it is configured to be pushed back in the direction, there is no particular configuration. That is, the tip of the arm portion 30b is not formed is inclined faces 30b _1, pin 27f of the setting member 27 is elongated groove 3
After entering 0c, the arm portion 30b abuts on the pin 27f to prevent the slave arm 30 from rotating counterclockwise. However, in this case, depending on the timing, the slit forming edge of the slit forming blade 34 may be forced to open the exposure opening. Often occur at the overlapping part of the blades,
As long as it covers the overlapping portion between the zero and the blade 41, it is possible to obtain a certain light shielding effect.

In the above-described embodiment, the space between the shutter base plate 1 and the intermediate plate 37 is the blade chamber of the rear blade group. This is to make it easier to obtain a good connection relationship with the long groove 30c of the slave arm 30, and if it is determined that there is no particular problem with the connection relationship, the connection between the intermediate plate 37 and the auxiliary base plate 47 is made later. It can be used as a wing chamber of a wing group.

Further, in the above embodiment, the present invention is applied to the rear blade group of the double light shielding type shutter, but the present invention is limited to such a double light shielding type shutter. However, the present invention can be applied not only to the rear blade group as described above but also to the front blade group. However, when the present invention is applied to the front blade group having the above configuration, the auxiliary member and the main arm are brought into contact with the buffer member almost simultaneously, instead of the auxiliary member and the slave arm. In the above embodiment, the auxiliary member is
Although attached to the pivot of the blade, the present invention is not limited to such a configuration, and may be independently attached between the two arms. Further, as a configuration of each blade group, one having three or more arms is known, but the present invention can be applied to such a configuration of the blade group. In this case, the arm closest to the exposure operation direction is brought into contact with the buffer member, so that the auxiliary member must be pivotally supported by the arm.

[0065]

As described above, according to the present invention, at least one blade group includes a plurality of arms pivotally attached to the main plate and a plurality of blades pivotally supported in the longitudinal direction thereof. And an auxiliary member attached between the two arms, and at the end of the exposure operation, the auxiliary member and one arm to which the auxiliary member is attached,
Since the abutment members are simultaneously brought into contact with each other, it is possible to reduce deformation of the blades and the arms and effectively suppress the squashing phenomenon.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment viewed from a subject side, that is, a photographing lens side, and shows a set state, that is, a double light blocking state.

FIG. 2 is a plan view showing a shutter base plate of the embodiment and members directly related thereto.

3 (a) to 3 (c) are illustrations of members mounted on a photographing lens side of a shutter base plate shown in FIG. 2;
FIG. 3 is a plan view sequentially showing a lens arranged closest to a photographing lens.

FIGS. 4 (a) to 4 (e) show, among members attached to the taking lens side of the shutter base plate, members attached to the shutter base plate side from those shown in FIG. 3 (c); FIG. 2 is a plan view mainly showing the state of FIG. 1 in order from the one arranged on the photographing lens side.

5 (a) and 5 (b) are plan views showing the rear blade group and the set spring in the state of FIG. 1. FIG.

FIG. 6 is a plan view of an intermediate plate used in the embodiment.

FIGS. 7 (a) to 7 (c) are views showing a state in which the gap between the front blade group, the backlash spring of the front blade group, and the blade chamber of the front blade group in the state of FIG. 1 is secured. It is the top view which showed the seat.

8 (a) to 8 (c) are plan views showing members arranged on the film surface side of the front blade group in order from the front blade group side.

FIG. 9 is a partial left side view of the embodiment.

10 is a plan view showing only a left part of FIG. 1 in an enlarged manner and removing some members shown in FIG. 1 so that the configuration of a main part can be understood.

FIG. 11 is an enlarged plan view showing only a left portion of FIG. 1 and shows a state in which the rear blade group is being operated after the double light blocking state is released.

12 is an enlarged plan view showing only a left portion of FIG. 1 and shows a state immediately after the state shown in FIG. 11;

FIG. 13 is an enlarged plan view showing only a left portion of FIG. 1 and shows a state immediately before the start of an exposure operation.

FIG. 14 is an enlarged plan view showing only a left portion of FIG. 1 and shows a fully opened state of an exposure opening during an exposure operation.

FIG. 15 is an enlarged plan view of only the left portion of FIG. 1, showing a state immediately after the end of the exposure operation.

FIG. 16 is an enlarged plan view showing the relationship between the set member and the rear blade group in the course of the set operation in the example.

[Explanation of symbols]

1 shutter base plate 1a, 37a, 47a opening 1b, 1c, 1d, 37b, 37c, 47t slot 1e, 47s relief groove 1f, 1g, 1h, 1i, 1r, 1s, 1t, 1u, 1
v, 1w, 1x, 1y, 1z shaft 1h _1, 1i _1, 1w ₁ screw hole 1j spot facing 1k, 1m, 1n thick portion 1k _1, 1k ₂ engaging portion 1k _3, 1k ₄ slope 1p, 1q shelf part 1x ₁ between seat 2,3,4,5,6,7,8,48,49 buffer member 9 supporting plate 9a, 9b, 9c, 9d, 10a, 10b, 10c, 1
0d, 29a, 30a, 30d, 37d, 37e, 38
a, 38b, 39a, 39b, 46a, 46b, 47
b, 47c, 47d, 47h, 47i Hole 9e, 9f Claw 9g, 17a, 18a, 27e Spring hook 9h, 9i, 15c, 16c Attachment 10 Printed wiring board 11, 12, 50, 51 Screw 13 For tip blade Electromagnets 13a, 14a Iron cores 13b, 14b Coil 14 Electromagnet for rear blade 15 Drive member for front blade 15a, 16a, 27a Tube portion 15b, 16b Drive pin 16 Drive member for rear blade 16b ₁ Pushing surface 17, 18 Ratchet wheel 17b , 18b Tooth 19, 22 Roller 20, 23 Iron piece 20a, 23a Iron piece 20b, 23b Shaft 20c, 23c Head 21 Driving spring for front blade 24 Driving spring for rear blade 25, 26 Compression spring 27 Set member 27b, 27c Pushing portion 27d, 29b Pushed portion 27f Pin 28 Return spring 29, 38 Main arm 3 , 39 slave arm 30b arms 30b ₁ inclined plane 30c elongated groove 30e, 35a abutting portion 31,32,33,34,40,41,42,43 blade 35 assisting member 36 set spring 37 intermediate plate 37f, 37 g, 37h Zhang Protruding portion 44 Backlash spring 45 Spacing 46 Holder plate for leading blade 47 Auxiliary ground plate 47e, 47f, 47g, 47q, 47r Bending portion 47j, 47k Hook portion 47m, 47n, 47p Projecting portion

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H081 AA19 AA20 AA21 AA23 AA24 AA29 AA31 AA39 BB02 BB26 BB27 BB39 CC03 CC13 CC28 CC52

Claims (4)

[Claims] At least one of a front blade group and a rear blade group arranged in each blade chamber formed by dividing two ground plates with an intermediate plate is provided with one of the two ground plates. A plurality of arms pivotally mounted, a plurality of blades each of which is pivotally supported by a predetermined two of them through a connecting shaft, and a connecting shaft between two of the arms; It is composed of a pivoted auxiliary member,
One of the auxiliary member and the arm supporting it,
A focal plane shutter for a camera, wherein abutment portions having substantially the same shape are formed, and when the exposure operation is completed, the abutment portions abut on the same buffer member at substantially the same time. . 2. The method according to claim 1, wherein the one blade group is a rear blade group. Thereafter, the one blade group is urged in a setting direction by a set spring, and pushes one of the arms to the rear blade driving member during an exposure operation. When the setting operation of the rear blade drive member is performed, the rear blade driving member is locked at the light blocking position of the exposure opening, and immediately before the exposure operation, the operation member is operated to the exposure operation start position by the urging force of the set spring. The focal plane shutter for a camera according to claim 1, wherein: 3. The device according to claim 1, wherein the auxiliary member is pivotally supported by two arms at a pivot portion of the predetermined one blade via a common connection shaft. Focal plane shutter for camera. 4. A rivet component, wherein at least one of the common coupling shafts located in the vicinity of the two contact portions is a rivet component, and the head portion of the rivet component is attached to the two contact portions. A contact portion having a shape substantially the same as that of the contact member is formed, and at the end of the exposure operation, the three contact portions come into contact with the same buffer member at substantially the same time. 4. The focal plane shutter for a camera according to 3.