JP3284344B2 - Focal plane shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focal plane shutter comprising a plurality of divided blade groups. More specifically, the present invention relates to a plurality of arms constituting a parallel link mechanism. The present invention relates to a device for making close contact with each other.

[0002]

2. Description of the Related Art A plurality of divided blade groups are sequentially pivotally supported from two ends on two arms pivotally supported on one side of a substrate, and at least one of the blades is bent at one or more locations. A focal plane shutter in which the shutters are brought into close contact with each other has already been proposed in Japanese Patent Application Laid-Open No. 55-9507. Such a shutter directly performs a bending process on a blade as shown in FIG.

[0003]

In the case of a blade using a light alloy such as aluminum, which has been widely used recently, since it is extremely soft, it is liable to be deformed in handling before being connected to the arm. Handling is complicated.
In addition, when the blades are sequentially stacked upon coupling to the arm, the blades and the coupling shaft of the caulking coupling portion cannot be kept horizontal to the coupling machine and the coupling jig.
0.1 ~ for a blade with a thickness of about 05mm
The caulking of the connecting shaft projecting only about 0.15 mm results in an extremely unstable connecting state, and the operation of the blade, which is the most important part of the shutter, lacks smoothness and reliability.

Further, it is necessary to control the bending height of the blades extremely strictly. If the bent portion is too bent, the bent portion pushes up the other blades in the opposite direction, so that the blades come into close contact with each other. Objective is not achieved. It should be noted that it is extremely difficult to perform a bending process after the bonding because the adhesiveness is rather deteriorated. In the case of a blade using a synthetic resin material, there is a problem that it is extremely difficult to perform bending.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for operating a blade group consisting of a slit forming blade and a covering blade covering a light transmitting window at one side of the light transmitting window. The arm that is supported and operated is moved so that the blades of the blade group approach the parallel state in the thickness direction .
Of the operating area of the blade group with respect to the shaft that pivotally supports the
It is inclined by inclination means provided on the substantially opposite side .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shutter substrate having a light-passing window, a blade group including a slit-forming blade and a covering blade covering the light-passing window, and each blade of the blade group supported by one side of the light-passing window. And at least two arms for actuating the blades, and tilting means for tilting the arms in a direction approaching the plate thickness direction while maintaining the blades of the blade group in parallel. It is provided on the substantially opposite side of the group operating area. Preferably, the arm is provided with a biasing means for displacing the blade group in the traveling direction.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the present invention.
In the drawing, reference numeral 1 denotes a substrate having a light-passing window 1a, and two shafts 1c and 1b vertically spaced apart from each other on one side thereof. The end is pivotally pivoted. These first and second main arms 3 and 4 hold the slit forming blade 6 so as to move up and down horizontally along the light ray passing window 1a.
By connecting the tips to the shafts 16 and 26 on the slit forming blade 6 implanted at the same interval as the above, a parallel link mechanism is constituted by the substrate 1, these main arms 3, 4 and the slit blade 6. First trailing covering blade 7 following slit forming blade 6 by main arms 3 and 4
Is supported via shafts 17, 27 implanted therein.

The substrate 1 is provided with an inclined portion 1e which is in contact with the end of the main arm 4 on the shaft 1b side and inclines the main arm 4. Arm 4 provided with inclined portion 1e in FIG.
3 shows the side shapes of the blades and the arms 4 pivotally supported by. In the figure, the blades 6
7, 8 and 9 are pivotally supported, and the arm 4 inclines the respective blades in a direction approaching each other by the inclined portion 1e of the inclination means, so that they are pivotally supported by the shafts 26, 27, 28 and 29. The blades 6, 7, 8, 9 are flat.

In FIG. 1, reference numeral 5 denotes an auxiliary arm pivotally supported by a shaft 1d on the substrate 1 provided below the first main arm 3 and swings therewith. The shafts 18, 28, 19, 29 on the second and third subsequent covering blades 8, 9 which are planted at a large interval corresponding to the distance between the main arm shaft 1b and the third arm shaft 1d are supported. Thus, the second and third subsequent covering blades 8 and 9 are configured to move stably. Note that reference numeral 4a in FIG.
Indicates an operation hole on the second main arm 4 which engages with a drive pin (not shown).

In the above-described embodiment, the operating hole 4a is
When the second main arm 4 driven by a drive pin (not shown) rotates around the shaft 1b, the first main arm 3 constituting the parallel link mechanism and the auxiliary arm 5 located thereunder are also By swinging, the held slit forming blade 6 and the subsequent covering blades 7, 8, and 9 are moved along the light beam passing window 1a while being held horizontally.
When the exposure time elapses by a known method (not shown) after the start of movement of the blade group, a blade group separately provided from the blade group (omitted for simplicity of the drawing, but pivoted to the substrate with the same configuration) ) Is likewise sequentially covered with the light passing window 1a, and the exposure is terminated.

FIG. 3 shows an embodiment provided with an urging means 30 for urging the arm 4 to move the blade group in one of the running directions. FIG. 4 shows an embodiment in which the arm 4 is inclined using a separate spacer 40 as an inclination means. In the above embodiment, only the arm 4 is inclined, but it goes without saying that other arms may be inclined. In the above embodiment, the auxiliary arm 5 is used so as to reduce the interference between the blades. Even if the blades are slightly warped, the interference is less likely to occur, and efficient work is guaranteed. However, it can be easily understood that the effect of the present invention can be obtained even when all the blades are supported by the two arms.

[0012]

As is clear from the above description, pivot the tilt means each vane Ru is inclined arm in a direction to approach the thickness direction while maintaining the parallel state pivotable arm
Since the blades are provided on the opposite side of the operating area of the blade group with respect to the shaft, the blades and arms can be used flat without bending, and each blade interferes in a single plane The shutter operates without any friction and does not cause friction, so that this kind of shutter can be operated at a high speed, and since there is no difference between the shutters, it is possible to produce a shutter with high productivity.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view of a main part of FIG. 1;

FIG. 3 is a side view of a main part of another embodiment.

FIG. 4 is a side view of a main part of another embodiment.

FIG. 5 is a side view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 1a Light passage window 1e Inclination means 3,4 Arm 6,7,8,9 Blade 30 Urging means 40 Spacer

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 9/08-9/54

Claims (2)

(57) [Claims] 1. A shutter substrate having a light-passing window, a blade group including a slit-forming blade and a covering blade covering the light-passing window, and each of the blade groups supported by one side of the light-passing window. at least two arms, and a tilting means for the blades of the blade set tilts the arm in a direction to approach the thickness direction while maintaining the parallel state Bei actuating the blade
The tilting means is provided on a shaft for pivotally supporting the arm.
A focal plane shutter provided substantially opposite to an operation area of the blade group . 2. The method of claim 1, wherein at least one
Urging means for displacing the blade group in the running direction on the arm
Focal plane shutter, characterized in that the provided.