JPS5814340Y2 - camera guide - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a camera shutter.

In general, metal focal plane shutters for cameras in which an opening (front) blade and a closing blade group (rear blade) sequentially open and close an opening to perform an exposure operation have the following drawbacks.

First, since the size of the shutter tends to increase due to the storage space for the shutter blade group, it has been difficult to make it suitable for compact cameras.

As a way to eliminate this drawback, there are methods to reduce the storage space for the shutter blade group by subdividing the shutter blades, or to reduce the storage space by making the shutter blades smaller.However, in the former method, the number of divisions is As the number of shutter blades increases, the light-shielding property becomes poorer, and the inertial mass of the shutter blade group increases, which adversely affects the operation and deteriorates exposure accuracy, durability, etc.

However, the latter method has the disadvantage that the amount of blade shape when covering the opening is reduced, resulting in poor light-shielding properties.

Second, since a strong driving force is required to open and close the shutter blade group, which has a large inertial mass, the shutter has drawbacks such as heavy charging and poor durability.

Thirdly, when the curtain speed is increased in order to increase the maximum speed, the flash synchronization time, etc., after the exposure operation is completed, the closing blade group bounces and opens a part of the opening again, so-called The drawback was that it required re-exposure.

As an effective method to eliminate the various drawbacks mentioned above,
After the exposure operation is completed, the already used open blade group is displaced in the charging direction within a predetermined time to additionally cover a portion of the opening covered by the closed blade group or the entire area as necessary. The same applicant filed Japanese Patent Application No. 57100-1983 for a camera shutter that was highly effective.

The present invention relates to an actuating device for a group of open blades applied to a shutter of the above-mentioned type, which has already been applied for, and will be described in detail below with reference to the drawings.

Figure 1 is a front view showing the state in which the shutter is charged;
FIG. 2 is a front view showing the state immediately after the shutter has completed its exposure operation, and FIG. 3 is a front view showing the state where the shutter has completed a series of operations.

In the figure, 1 is a substrate having an opening 1a for film exposure, 2 is a holding plate for forming an operating space for the shutter blade, and has an opening 2a that coincides with the opening 1a, and is placed on the substrate 1. It is fixed to 2b.

Reference numeral 3 denotes a group of opening blades for opening the opening 1a during the exposure operation, consisting of an opening slit forming blade 3a and a shielding blade 3b.
A link mechanism is constituted by an opening member 4 and an opening auxiliary member 5 which are pivoted on a base plate 1,
The opening member 4 and the opening auxiliary member 5 are provided with pivot supports 4a, 5a, 4.
b, 5b.

Reference numeral 6 denotes a closing blade group for closing the opening 1a during the exposure operation, which includes a closing slit forming blade 6a and a shielding blade 6b.
substantially the same as the opening blade group 3, a link mechanism is constituted by the closing member T and the closing auxiliary member 8, which are pivoted on the base plate 1. Pivots 7at8a, 7b, and 7b are supported on the closing auxiliary member 8.

The opening member 4 is provided with a curved portion 4c and an arm 4d, and the closing member I is provided with an arm 7c and a closing drive spring 7f.
It is given dextrorotation by

Reference numeral 9 denotes an opening drive member, which is supported coaxially with the shaft 4e, and is given dextrorotation by an opening drive spring 9f.

Reference numeral 10 designates a connecting member, which includes a claw portion 10a that can be engaged with and detached from the curved portion 4c of the opening member 4, and a curved portion 10 in which the arm γC of the closing member I comes into contact with each other.
a spring 10f, which has a curved portion 10d that contacts the arm 4d of the opening member 4, is supported on the opening drive member 9 by a shaft 10e, and is also used to impart levorotation to the opening member 4;
It is given dextrorotation by

Next, its operation will be explained.

From the state shown in FIG. 1, the opening member 4 is opened using a known device.
When the lock (path shown) is released, the opening member 4 starts turning to the right by the opening drive member 9 having a driving force of 9f, causing the opening blade group 3 to travel downward and opening the opening 1a. Perform film exposure.

When a desired exposure time elapses after the opening blade group 3 starts the opening operation, the locking of the closing member T (the path shown in the figure) is released by a known device, and the closing member 7 is moved by the closing member 1 driving spring 7.
A right turn is started by f, and the closing blade group 6 is caused to travel downward.

When the closing blade group 6 reaches a position slightly before completing the closing operation, the arm 7c of the closing member T is connected to the connecting member 100.
The connecting member 10 is turned to the left by pressing the curved portion 10b, and the engagement between the claw portion 10a and the curved portion 4c of the opening member 4 is released, and the connection between the opening member 4 and the opening drive member 9 is released, and the opening drive member 9 is closed. The operation is slowed down to end the exposure operation.

This state is shown in FIG.

From the state shown in FIG. 2, the connecting member 1 having an inertial mass
0 further turns to the left due to inertial force, and the bending portion 10d presses the arm 4d of the opening member 4, causing the opening member 4 to turn to the left and displacing the opening blade group 3 upward.

At this time, the spring 10f can be used for other purposes as an auxiliary driving force for displacing the open blade group 3 further upwards or as an auxiliary driving force for holding it in the position displaced by the above method. Although it is configured as follows, it may not be necessary in principle.

Thereafter, when the open blade group 3 is displaced by the spring 10f and comes to rest at approximately the charging position, the state shown in FIG. 3 is reached.

Next, when charging the shutter, from the state shown in FIG. 3, the opening driving member 9 is turned to the left in a known manner against the opening driving spring 9f, and the opening driving member 9 is turned to the left against the closing driving spring 9f. The closing member 7 is rotated counterclockwise against the dextrorotation in a known manner to connect the opening member 4 and the opening drive member 9, and the opening end and the closing members 4, 7 are locked against the dextrorotation ( (Illustrated path).

(The state shown in Fig. 1 is reached.

) Note that the present invention is not limited to the above-mentioned embodiments; for example, the present invention is not limited to the above-mentioned embodiments, and can be applied, for example, to shutters in which the opening and closing blade groups 3 and 6 are each constructed using one blade, rotary blades, etc.; It is also possible to implement the present invention in the same manner in a so-called lens shutter constructed using closing blades.

As is clear from the above explanation, the present invention is capable of quickly displacing the opening blade group 3 in the charging direction after the exposure operation is completed, and also has the effect of slowing down the closing operation, so it is more advantageous to prevent re-exposure. Even when applied to a camera or camera shutter using a braking device using friction etc. as a method to prevent the open blade group from bouncing, it is possible to escape the open blade group from the friction area, and furthermore, Since the open blade group escapes from the friction area, the charge of the shutter becomes lighter.
Furthermore, it is advantageous in terms of space and structure, and the benefits are extremely large.

[Brief explanation of drawings]

Figure 1 is a front view showing the state in which the shutter is charged;
FIG. 2 is a front view showing the state immediately after the shutter has completed its exposure operation, and FIG. 3 is a front view showing the state where the shutter has completed a series of operations. In the figure, 1 is a substrate, 2 is a presser plate, 3 is a group of open blades,
4 is an opening member, 5 is an opening auxiliary member, 6 is a closing blade group, 7
1 is a closing member, 8 is a closing auxiliary member, 9 is an opening drive member, 1
0 indicates a connecting member.

Claims (1)

[Scope of utility model registration request] The opening and closing blades sequentially open and close the opening to perform an exposure operation, and within a predetermined time after the exposure operation ends, only the opening blade is displaced in the charging direction to add at least a portion of the opening covered by the closing blade. An opening member 4 for opening and closing the opening blade 3 by pressing a button on a camera shutter of the type that covers the camera; a closing member I for opening and closing the closing blade 6; and a closing member I for opening and closing the closing blade 6; an opening drive member 9 having a driving force of 9f;
It consists of a connecting member 10 having one end that is pressed by the closing member 7 in the region where the operation of the closing member 7 ends, and the other end that allows the opening member 4 to rotate. One end of the connecting member 10 is connected to the closing member 7.
After the opening member 4 is pressed and rotated by the opening member 4 to release the connection between the opening member 4 and the opening driving member 9, the connection member 10 is further rotated by inertia force, and the other end of the connecting member 10 is rotated by the opening member 4.
A blade actuating device for a camera shutter, characterized in that it is configured to press and displace the blade in a charging direction.