JPH0626897Y2 - Blade support device for focal plane shutter for camera - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade support device for a focal plane shutter for a camera, which is composed of a plurality of blade groups.

[0002]

2. Description of the Related Art Conventionally, the construction of a blade support device for a focal plane shutter for a camera is such that a plurality of divided blade groups are sequentially pivoted from the respective tips of two arms pivotally supported on one side of the machine frame to the middle. It was designed to be supported (Japanese Patent Publication No. 54-191753). Since this type of shutter directly or indirectly rotatably supports all the blades on each arm, it has good operating efficiency and is suitable for high-speed operation.

On the other hand, in order to improve the above-mentioned shutter in response to the demand for downsizing of today's cameras, as shown in Japanese Utility Model Publication No. 57-57367, a part of two arms is provided via an auxiliary arm. It is known that the wings are pivotally supported.

Further, for compactness, a shutter has been realized in which each blade group is further subdivided to pivotally support two arms.

[0005]

However, in such an improved shutter corresponding to the compactness, the weight of each of the auxiliary arm or the subdivided blade is weighted by the two arms. Poor durability and easy failure.

Therefore, the object of the present invention is that the load is not concentrated on each arm even when it is made compact, and the blades are easily caulked to the arm, which is suitable for higher speed. It is to provide a new blade support device.

[0007]

In order to achieve such an object, a blade group, a first and a second main arm, and an auxiliary arm are provided, and the blade group includes a slit forming blade and a subsequent cover. The blade is divided into a plurality of blades that cover the light passage window, and the base ends of the first and second main arms are rotatably attached to one side of the light passage window. It is supported to form a parallel link mechanism, and the base end portion of the auxiliary arm forms a parallel link mechanism with the both main arms and is rotatably supported at a position different from that of each base end portion. The slit forming blade is rotatably supported at the tip of the first and second main arms, and one of all the blades is attached to the second main arm of the main arm. Shafts rotatably support the blades, and the first main arm and the auxiliary arm of the main arms are provided with Square axes Yes and rotatably supported each vane further the auxiliary A - distance between the shaft support shaft support and the covered blades of the base end portion of the arm, the first,
It is located at a position shorter than the distance between the shaft support of the base end of the second main arm and the shaft support of the slit forming blade.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 (a) to 1 (f) each show the principle of the blade supporting mechanism according to the present invention, and the most basic structure thereof is shown in (a) of this drawing.

In FIG. 1 (a), at the left edge of the substrate H, first and second main arms A and B and an auxiliary arm C are rotatably rotatably supported with their base ends vertically aligned. I am doing it. The axially supporting portion of the base end portion of the auxiliary arm C is located below the line connecting the axially supporting portions of the base end portions of the first and second main arms A and B. Furthermore, the tips of the first and second main arms are
It is rotatably connected to the left end of a slit forming blade (hereinafter simply referred to as "slit blade") E. A trailing cover blade (hereinafter simply referred to as “cover blade”) F has its left upper end portion rotatably connected at the center of the first main arm A, and its left lower end portion is the lowest. The tip of the auxiliary arm C is rotatably connected.

As described above, one of the blades E and F is pivotally supported by the first main arm A on one of the pivotal support portions. The first and second main arms A and B form a parallel link, and the auxiliary arm C forms a parallel link with the first main arm A.

The distance between the pivotal support portion of the base end portion of the auxiliary arm C and the pivotal support portion of the cover blade F is determined by the axis of the base end portion of the first and second main arms A and B. It is shorter than the distance between the supporting portion and the shaft supporting portion of the slit forming blade E.

As a result, one of the slit blade E and the cover blade F is pivotally supported by the uppermost first main arm A, and the other is pivotally supported by the second main arm B and auxiliary arm C. At this time, it is possible to stably support the base end portion of each arm as a guide, and therefore, the caulking connection of each blade can be ensured. Also, since the weight of each blade is shared by the three arms and is pivotally supported,
Never concentrate. In FIG. 1B, the auxiliary arm C is placed above the first and second main arms B and A, and the slit blade E is supported by the first and second main arms B and A. E
One side of the covering blade F extending more to the side is provided with the auxiliary arm C and the second lowermost second position which is the farthest from the auxiliary arm C.
The main arm A of FIG. Other configurations are substantially the same as those in FIG.

1 (c) and the following figures show the use of two cover blades. In FIG. 1 (c), the slit blade E is shown as the first and second main arms A, B. While supporting by one side of the cover blades F, G, the uppermost main arm A
FIG. 3 shows a device in which the other side is supported by the lowest auxiliary arm C, respectively. That is, one of the shafts of all the blades is connected to the first main arm A. The first and second main arms A and B form a parallel link,
The first main arm A and the auxiliary arm C also form a parallel link. Further, FIG. 1 (d) shows the auxiliary arm C of FIG. 1 (c).
Is the top level, and other configurations are substantially the same as those in FIG. The one shown in FIG. 1 (e) is characterized by using four arms A, B, C and D. The first main arm A and the second main arm B are used. Each of the tips is rotatably connected to the slit blade F. The middle of the first main arm A and the tip of the first auxiliary arm C are rotatably connected to the first cover blade F. Further, the second main blade G has a first main arm A
Of the main arm A and the distal end of the second auxiliary arm D farthest from the main arm A are rotatably connected. And
One of the blades of each blade is connected to the first main arm A.

The one shown in FIG. 1 (f) has been further improved so as to conform to the substance, and the slit blade E and the cover immediately below it are provided by the first and second main arms A and B. It supports two blades of the blade F, and further supports the last succeeding cover blade G by the middle of the first main arm A and the tip of the auxiliary arm C. Other configurations are substantially the same as those described above.

The apparatus shown in FIG. 1 has a structure in which each blade is subdivided in order to make the shutter compact.
With respect to the increase in weight accompanied by the increase in the number of blades, which is inevitably increased, an arm is added to share the weight to avoid concentration, and at that time, the arm and each blade are easily caulked.

In any of the devices (a) to (f) described above, since one shaft support of all the blades is connected to one main arm, the blades connected by parallel links and Each arm can be sequentially coupled in a relatively cohesive manner without handling them individually.
That is, since the other arm always forms a parallel link with respect to the one main arm, if the one main arm is handled as a center, the other links are less likely to be mixed.

Therefore, in the caulking connection for connecting each blade and each arm, it becomes easy to sequentially work by fitting the base end portion, which is the center of rotation of each arm, into the processing jig as a guide.

FIG. 2 shows an embodiment of the present invention embodying the above-mentioned principle.

A light passage window 2 is formed on the substrate 1, and the left side of the light passage window 2 is vertically spaced from each other for supporting the second main arm 3 and the first main arm 4. Two shafts 3a and 4a are provided, each of which has a second main arm 3 and a first shaft 3a.
Each base end portion of the main arm 4 is rotatably supported. These first and second main arms 4 and 3 hold the slit blade 6 so as to move vertically along the light beam passage window 2. Two shafts 6a, 6b on the slit blade 6
The distance between them is the same as that of the shafts 3a and 4a. By connecting the tips of the main arms 3 and 4 to the shafts so as to rotate freely, respectively, the substrate 1 and the main arms 3 and 4 are connected. And the slit blades 6 constitute a parallel link mechanism.

Further, the base arms of the first cover blades 7 following the slit blades 6 are planted in the main arms 3 and 4 and rotatably supported by the shafts 7a and 7b.

On the other hand, the base end of the auxiliary arm 5 is rotatably supported by the shaft 5a, and the position of this shaft is above the second main arm 3 and It is provided on an extension of a line connecting the shafts 3a and 4a of both main arms 3 and 4.
The auxiliary arm 5 forms a parallel link with one of the main arms 4 and swings in conjunction with the main arm 4.

By the way, the auxiliary arm 5 and the lowermost first main arm 4 are connected to the base ends of the second and third cover blades 8 and 9 via shafts 8a, 8b, 9a and 9b. It is rotatably connected. The distance between the shafts 8a-8b and 9a-9b is
The distance between the axis 5a of the auxiliary arm 5 and the axis 4a of the first main arm 4 is the same.

In this way, the second and third cover blades 8,
It is configured to allow the 9 to move stably. Further, all the blades 6, 7, 8 and 9 are connected to the first main arm 4 by one of the shaft supporting portions 6b, 7b, 8b and 9b.

The distance between the shaft supporting portion 5a at the base end portion of the auxiliary arm 5 and the shaft supporting portion 9a of the cover blade 9 is such that the base end portions of the first and second main arms 4 and 3 are the same. Shaft support 4
a, 3a and shaft support portions 6a, 6b of the slit forming blade 6
Shorter than the distance between. The first main arm 4 is provided with an operation hole 4c which can be engaged with a drive pin (not shown). Furthermore, the weights of all the blades 6, 7, 8, 9 are shared by the three shafts 3a, 4a, 5a.

Next, the operation of the embodiment will be described. When the first main arm 4 driven by the drive pin through the operation hole 4c rotates about the shaft 4a as a fulcrum, the second main arm 3 constituting the parallel link mechanism and the auxiliary arm 5 located above the second main arm 3 are formed. Also, the slit blade 6 and the covering blades 7, 8 and 9 following the slit blade 6 are horizontally swung together with the slit blade 6 and moved along the light beam passage window 2 while being held horizontally.

By the way, when the main arm 4 shown in FIG. 2 is driven, distortion is generated in the direction orthogonal to the movement direction of the arm at the initial stage of movement to cause friction between the blades, but the auxiliary arm 5 is provided. As a result, momentary energy absorption is achieved, improving startability and
It is extremely effective for shutters that perform high speed control such as 00 and 1/8000 seconds.

The main arms A and B and the auxiliary arm C are
The base end portion is not limited to axially supporting it in a vertical line, and it is sufficient that a pair of arms each form a parallel link.

[0028]

According to the present invention, a camera in which a plurality of blades divided by a plurality of parallel links are rotatably supported, and a base end of each arm of each parallel link is supported on a substrate. Blade support device for a focal plane shutter for a vehicle, wherein one main arm of the two main arms pivotally supporting the slit forming blade is coupled to and supports one axial support portion of the other blade, and the other axial support portion is supported. Since it is connected to and supported by the other main arm and auxiliary arm, the weight of the divided blades is shared by the base ends of the respective arms and is not concentrated at the base ends of the main arms. Moreover, since it is possible to relatively easily perform the caulking connection between the arms and the blades, the connecting portion can be surely strengthened.

Further, compared to the conventional one in which all the blades are pivotally supported by one set of arms, even if a part having a slight bend is used in either the arm or the blades, the movement performance due to friction between them is caused. Is reduced. Further, when the main arm is driven, in the initial stage of the movement, distortion is caused in the direction orthogonal to the movement direction of the arm and friction is generated between the blades, but the provision of the auxiliary arm causes instantaneous energy absorption. Therefore, the startability is improved, which is extremely effective for a shutter that performs high speed control.

[Brief description of drawings]

1 (a) to 1 (f) are explanatory views showing the principle of the present invention.

FIG. 2 is a front view of an apparatus showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate, 2 Ray passage window 3,4 Main arm 3a-9a axis 6b-9b axis 5 Auxiliary arm 6 Slit forming blade 7,8,9 Subsequent cover blade

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Hirai 934-13 Shikato, Yotsukaido, Chiba Prefecture Seiko Optical Co., Ltd. Within the corporation (56) References JP-A-51-105816 (JP, A) JP-B-55-36817 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A blade group, a first main arm, a second main arm, and an auxiliary arm, wherein the blade group includes a slit forming blade and a subsequent cover blade, and a plurality of blade cover windows are provided. The base ends of the first and second main arms are rotatably supported on one side of the light passage window to form a parallel link mechanism. The base end portion of the arm constitutes a parallel link mechanism with the both main arms and is rotatably supported at a position different from that of each base end portion. , 2 is rotatably supported at the tips of the main arms, and one axis of all the blades is rotatably supported on the second main arm of the main arms. Of the main arms, the first main arm and the auxiliary arm have the other shafts of the blades rotatably supporting the blades. In addition, the distance between the pivotal support portion of the base end portion of the auxiliary arm and the pivotal support portion of the cover blade is the same as that of the axial support portion of the base end portion of the first and second main arms and the slit formation. A blade support device for a focal plane shutter for a camera, which is shorter than a distance between the blade and a shaft support.