JPH024887B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blade actuating device for a focal plane shutter, and more particularly to a blade actuating device for a shutter blade composed of a slit forming blade and a plurality of auxiliary blades.

For example, a blade actuating device for a focal plane shutter is generally one in which a shutter blade divided into a plurality of parts is rotated or parallel-rotated by a pair of parallel rods in order to cover an aperture.

In this system, the slit forming blades are supported at the tips of two rotating parallel rods by means of a mechanism, and the rotation of the parallel rods causes the slit forming blades to move parallelly and rotationally. The auxiliary blades are simultaneously rotated by the movement.

In such a conventional configuration, parallel rods are essential, and the operation of the slit forming blades is uniform due to the nature of the parallel rods.

In view of the above-mentioned conventional example, the present invention aims to reduce the number of component parts and the number of man-hours required for manufacturing the slit-forming blades by omitting the parallel rods, and also allows for a certain degree of freedom in designing the movement of the slit-forming blades. The object of the present invention is to provide a focal plane shutter.

The object of the present invention is achieved by supporting the slit-forming blade by an auxiliary blade, and by configuring the auxiliary blade to be rotated by an actuating member by fitting the cam slot and the pin. Ru.
No one has yet proposed a device in which the members supporting the slit-forming blades are rotated by the engagement of the cam slot and the pin.

The present invention will be explained below based on the illustrated embodiments.

First, FIG. 1 is a plan view showing only the configuration of the leading blade group. In the figure, 1 is a lower shutter plate in which an aperture 1a is formed. 2
1 is a slit-forming blade having a slit-forming surface 2a, and 3, 4, 5, and 6 are auxiliary blades, which constitute a leading blade group.

Each of the auxiliary blades 3, 4, 5, and 6 has a cam slot 3a, 4a, 5a, and 6a formed therein, and is rotatably supported by a shaft 7 mounted on the shutter plate 1. In addition, the cam slots 3a, 4
The shape of a is such that when the auxiliary blades 3 and 4 are rotated by a slot pin 8a, which will be described later, the slit forming blade 2 can move parallel to the edge of the aperture 1a.

The slit forming blade 2 is connected to the auxiliary blade 4 on the one hand.
The tip 4b of the auxiliary blade 3 is supported by a pin 3b which is set up at the tip of the auxiliary blade 3, and the groove 2b is fitted into the pin 3b. Of course, the relationship that supports the slit-forming blades is not limited to this. For example, even if the relationship between the auxiliary blades 3 and 4 is reversed, both the auxiliary blades 3 and 4 may be supported by pins and grooves. The relationship between the pin and the groove may be reversed, or the relationship between the pin and the groove may be reversed.

8 is a leading blade operating lever, which is connected to the cam slot 3.
A slot pin 8a is installed at the tip so as to fit into the shutter plate 1.
It is rotatably supported on a shaft 9 which is installed on the shaft.

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

First, in the shutter set state shown in FIG. 1, when the operating lever 8 is rotated to the left by a drive device (not shown) in conjunction with the operation of the release button on the camera side, the slot pin 8A moves into the cam slot 3a, 4a, 5a,
Each auxiliary blade 3, 4, 5, 6 is rotated to the left while sliding on 6a. Although the operating angle of each of the auxiliary blades 3, 4, 5, and 6 differs depending on the shape of each cam slot, the auxiliary blades 3 and 4 are arranged so that the slit forming surface 2a of the slit forming blade 2 is parallel to the edge of the aperture 1a. Turn in such a way that you can maintain the The auxiliary blades 3, 4,
5 and 6, and in particular, the auxiliary blades 3 and 4, the slit forming blade 2 opens the aperture 1a while making a parallel-rotational movement. Then, the rotation of the actuating lever 8 is stopped in a state in which the leading blade group is folded above the aperture 1a as shown in FIG.

Next, the configuration and operation including the rear blade group will be explained based on FIG.

Although FIGS. 1 and 2 only show the leading blade group for convenience to simplify the drawings, the shutter is actually constructed including the trailing blade group as shown in FIG. 3.

The configuration of the rear blade group is the same as that of the front blade group and is arranged symmetrically, so a detailed explanation will be omitted. Reference numeral 12 denotes a slit-forming blade, and the slit-forming surface 12a forms a has been done. 13, 14, 15, 16 are auxiliary blades, 1
3a, 14a, 15a, 16a are cam slots,
13b and 14b are support pins for the slit forming blade 12, 17 is a shaft, 18 is an operating lever, 18a is a slot pin, and 19 is a shaft. Furthermore, a partition plate 20 separates the leading blade group and the trailing blade group, and a window 20a corresponding to the aperture 1a is formed. Therefore, the leading blade group operates between the lower shutter plate 1 and the partition plate 20, and the trailing blade group operates between the partition plate 20 and the upper shutter plate (cover plate), not shown. As a result, collision between the leading blade group and the trailing blade group can be avoided.

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

FIG. 3 shows the state before the shutter is set, with the leading blade group folded above the aperture 1a, and the trailing blade group expanded to cover the aperture 1a.

When the shutter setting operation is performed in this state, the leading blade group is expanded by right rotation of the operating lever 8, and covers the aperture 1a (FIG. 1). At the same time, the rear blade group is folded under the aperture by turning the operating lever 18 to the right.

When the release button is operated from the shutter set state, the leading blade group is folded above the aperture 1a as shown in FIG. As shown in , the rear blade group expands to cover the aperture a, and one photographing session is completed.

The configuration and operation of the embodiment of the focal plane shutter according to the present invention have been described above, but it is needless to say that the present invention is not limited thereto.

For example, as shown in FIG. 4, it is also possible to provide the rotation shaft 7' of the auxiliary blade 6' separately from the other rotation shafts 7'.

Regarding the slit forming surfaces, the slit forming surface 2a of the leading blade and the slit forming surface 12a of the trailing blade.
It suffices if they are parallel to each other, and not necessarily to the aperture 1a.
It does not have to be parallel to the edge of

Further, the shutter blade opening/closing operation is not limited to the above embodiment, and when the shutter is set, both the leading blade group and the trailing blade group are in an expanded state covering the aperture 1a, and the rear blade group is folded first by the shutter release. Then, the leading blade group is folded to open the aperture 1a, and then the trailing blade group is expanded to cover the aperture 1a, and finally the leading blade group is expanded to double cover the aperture 1a. But it's okay.

The blades are generally made of metal, but for example, the auxiliary blades that support the slit-forming blades may be made of metal, and the other auxiliary blades and slit-forming blades may be made of light-shielding plastic material. You can also do it.

By providing a portion of the plastic material in this way, it is possible to reduce the inertia and obtain a high shutter speed, and furthermore, the amount of setting force can be reduced.

As described above, the present invention eliminates the two parallel rods for operating the slit forming blades, and instead provides an operating lever for rotating the auxiliary blades so that the slit forming blades are supported by the auxiliary blades. Firstly, the number of parts of the shutter can be reduced,
It is possible to reduce the number of man-hours required for manufacturing the shutter eye, etc., and has the effect of downsizing the shutter and reducing costs.

Furthermore, since the auxiliary vanes that support the slit-forming vanes are rotated by the fitting action of the cam slot and the pin, the slit-forming vanes can be adjusted appropriately by appropriately designing the shape of the cam slot at the design stage. It has the advantage that it can be operated so that a slit is formed. In other words, if it is preferable for the slit-forming surface 12a of the slit-forming blade to operate parallel to the edge of the aperture 1a, it can be moved in that direction, or if it is preferable for the slit-forming surface 12a to operate at a slight inclination, it is free at the design stage. You can choose.

In addition, since the two auxiliary blades that drive the slit forming blade are coaxially supported, the connecting points of the two auxiliary blades and the slit forming blade have approximately parallel trajectories, so the length of the blade can be reduced. Even if the auxiliary blades are different, the slit forming blade can be easily moved in parallel with a simple slide pin connection.
Easy to assemble and manage. In general, in a structure that has a large number of auxiliary blades with different blade lengths, has few pivot points, and can form a blade group with a good space factor, it is possible to simply add a slit-forming blade without adding any actuating member for this purpose. , a focal plane shutter in which the slit forming part moves in parallel,
It has the remarkable effect that it can be provided easily with a compact configuration and a high degree of freedom in design.

[Brief explanation of drawings]

FIG. 1 is a partially omitted plan view of an embodiment of the present invention, FIG. 2 is a plan view after the operation of FIG. 1, FIG. 3 is a plan view supplementing the omitted portions of FIG. 2, and FIG. The figure is a partially omitted plan view of another embodiment according to the present invention. 1... Shutter plate, 1a... Aperture, 2... Slit forming blade (tip), 2a... Slit forming surface, 3, 4, 5, 6... Auxiliary blade (tip), 3a, 4a, 5a, 6a...cam slot, 2b...groove, 3b...pin, 4b...pin, 7...shaft, 8...operating lever (tip), 8a...
...Slot pin, 9...Shaft, 12...Slit forming blade (rear), 12a...Slit forming surface, 13,
14, 15, 16... Auxiliary blade (rear), 13a,
14a, 15a, 16a... cam slot, 12
b...groove, 13b...pin, 14b...pin, 17...shaft, 18...operating lever (rear), 1
8a...Slot pin, 19...Shaft, 20...Partition plate.

Claims (1)

[Scope of Claims] 1: a plurality of auxiliary blades rotatably supported on one side of the aperture; a slit-forming blade supported on two of the auxiliary blades; an actuating member pivotally supported on one side of the aperture, and the plurality of auxiliary blades are rotated through engagement between a pin provided on the actuating member and a cam slot formed in the plurality of auxiliary blades. A focal plane characterized in that the auxiliary blades that are moved and support at least the slit-forming blades are coaxially supported, and at least one of them supports the slit-forming blades through a relationship between a slide groove and a pin. Shutter blade actuator.