JPS5832689B2 - camera guide - Google Patents

Description

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

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

First, the size of the shutter tends to increase due to the storage space for the shutter blade group, making it difficult to apply it to 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 impairs exposure accuracy, durability, etc.

In addition, the latter method has the disadvantage that the amount of blade shape in the state where the opening is covered 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.

Third, if the curtain speed is increased in order to increase the maximum speed, internal light synchronization, etc., after the exposure operation is completed.

There is a drawback that the closing blade group opens a portion of the opening again by bouncing, resulting in so-called 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 an application on May 14, 1975 (name: Focal Plane Shutter A for Cameras) for the camera shutter that was used in this patent.

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

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a front view showing a state in which the shutter is charged, and FIG. 2 is a state in which the shutter is in a state immediately after completing its exposure operation. FIG. 3 is a front view showing a state in which the shutter has completed a series of operations.

In the figure, 1 is a substrate having an opening 1a for film exposure, and 2 is a holding plate for forming an operating space for the shutter blade. has been done.

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 the opening member 4 and the opening auxiliary member 5, which are pivoted on the base plate 1.
A shaft support 4a*5at4 is attached to the opening member 4 and the opening auxiliary member 5.
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.
The closing member 7 and the closing auxiliary member 8, which are pivoted on the base plate 1 in substantially the same way as the opening blade group 3, constitute a link mechanism. Pivots 7a, 8a, 7b, and 8b are supported on the closing auxiliary member 8.

The opening member 4 is provided with a curved portion 4c and an arm 4d.

The closing member 7 is provided with an arm 7d, and is given dextrorotation by a closing drive spring 7f.

An opening drive member 9 has an arm 9a, is supported coaxially with the shaft 4e, and is given dextrorotation by an opening drive spring 9f.

Reference numeral 10 denotes a connecting member for connecting the opening member 4 and the opening driving member 9 during the exposure operation, and the opening member 40 has a curved portion 4C.
It has a claw portion 10a that can be engaged with and detached from the closing member 7, and a curved portion 10b that the arm 7d of the closing member 7 comes into contact with, is supported on the opening drive member 9 by a shaft 10e, and is given dextrorotation by a spring 10f. It is being

Reference numeral 11 denotes a converting member, which is an arm 11 with which the arm 9a of the opening drive member 9 is brought into contact with the bending portion 11a that presses the arm 4d of the opening member 4.
b, is supported coaxially with the shaft 5e, and is given levorotation by a spring 11f.

Next, its operation will be explained.

When the shutter shown in FIG. 1 is in a charged state and the release member 4 is released from the lock (the path shown in the figure) using a known device, the release member 4 is moved to the release 1 drive member 9 having a driving force of 9f.
The camera starts turning to the right, moves the opening blade group 3 downward, opens the opening 1a, and performs film exposure.

When the desired exposure time has elapsed after the opening blade group 3 started the opening operation, the closing member 7 is locked (
(path shown) is released, the closing member 7 starts turning to the right by the driving cuff f, causes the closing blade group 6 to travel downward, closes the opening 1a, and ends the exposing operation.

FIG. 2 shows the state immediately after the exposure operation is completed.

The figure shows the state immediately after the arm 7d of the closing member 7 presses the curved portion 10b of the continuous member 100 to rotate the connecting member 10 to the left and disengage the claw portion 10a from the curved portion 4c of the opening member 4. It is.

From the state shown in FIG. 2, the opening drive member 9, which has been disconnected from the opening member 4, further rotates to the right by the opening drive spring 9f, and the arm 9a presses the arm 11b of the conversion member 11, causing the conversion member 11 is turned to the right, and the bending portion 11a provided on the converting member 11 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.

When the opening blade group 3 is displaced to a predetermined position and comes to rest, a series of shutter operations is completed.

Here, FIG. 3 shows a state in which the open blade group 3 has been displaced almost to the charging position and is stationary.

Next, when charging the shutter, the opening and closing drive springs 9f are activated from the state shown in FIG.

7f, the driving member 9 and the closing member 7 are respectively turned to the left in a known manner, and the claw portion 10 of the connecting member 10 is opened.
a and the curved portion 4c of the opening member 40 and locking the opening and closing member 4.7 against dextrorotation (path shown)
do.

(The state shown in Figure 1 will be reached.

) Figures 4 and 5 show a second embodiment of the present invention; Figure 4 is a front view showing the shutter in a charged state, and Figure 5 is a state in which the shutter has completed a series of operations. is a front view showing the opening blade group 3 after the exposure operation is completed.
The opening drive spring 9f displaces the
The converting means for changing the direction of the driving force of the first
In place of the converting member 11 shown in the embodiment, an opening member 20
The curved portion 211a for pressing the arm 204d of No. 4 and the substrate 1
Arm 211b that engages with pin 12 additionally fixed on top
The converting member 211 is coaxial with the shaft 10e and pivotally supported on the open drive member 209 by changing the design.

In addition, in order to avoid redundant explanations, the same reference numerals are used for members that are substantially the same as those in the first embodiment, and the reference numerals with 200 added are used for parts that have been partially changed.
We will only explain the operation of the parts that have been changed in design.

After the opening and closing blade groups 3 and 6 sequentially open and close the opening 1a from the charged state of the shutter shown in FIG. 4 to complete the exposure operation, the opening drive member is disconnected from the opening member 204. 209 is further turned to the right by the opening drive spring 9f as in the first embodiment.

When the opening drive member 9 turns to the right, the arm 2 of the conversion member 211
11b contacts the pin 12, the conversion member 2
11 to the left, and the curved portion 211a of the conversion member 211
presses the arm 204d of the opening member 204 and releases the opening member 2.
04 to the left to displace the open blade group 3 upward.

FIG. 5 shows a state in which the open blade group 3 is displaced almost to the charging position and remains stationary.

Figures 6 and 7 show a third embodiment of the present invention, with Figure 6 being a front view showing the state in which the shutter is charged, and Figure 7 showing the state in which the shutter has completed its series of operations. 3 is a front view showing a conversion means for changing the direction of the driving force of the opening drive spring 9f in order to displace the opening blade group 3 in the charging direction after the end of the exposure operation, as shown in the second embodiment. FIG. In place of the member 2110, the design has been changed to a connecting member 310 which is basically constructed by merging the converting member 211 and the connecting member 10 shown in the second embodiment.

The same reference numerals are used for parts that are the same as those in the second embodiment, and 100 is added for parts that have been partially changed to avoid redundant explanations, so the design has been changed. I will only explain the operation of the parts.

After the opening and closing blade groups 3 and 6 sequentially open and close the opening 1a from the charged state of the shutter shown in FIG. The member 209 is further turned to the right by the opening 1 drive spring 9f in the same manner as described above.

When the opening driving member 209 turns to the right, the arm 311b of the connecting member 310 comes into contact with the pin 12, causing the connecting member 310 to turn to the left against the spring 10f. presses the arm 204d of the opening member 204 to turn the opening member 204 to the left and displace the opening blade group 3 upward.

FIG. 7 shows a state in which the open blade group 3 is displaced almost to the charging position and remains stationary.

Note that the present invention is not limited to the above embodiments,
For example, in addition to the closing member 7 shown in the above embodiment, a release means for releasing the connection between the opening member and the opening driving member after the exposure operation is completed may be provided by means of the return stroke of the release, mechanically, or electrically using a magnet. A delay device, a component that operates in connection with the movement of the reflector to return to the image reflection position, or the return movement of the lens aperture to the open aperture position, etc. (when applied to an eye reflex camera), etc. is configured by changing the design. It is equally possible to configure the connection member by installing it on the open member, and it is also possible to configure the connecting member by installing the connecting member on the open member. It is equally possible to apply the present invention to a shutter composed of blades or a lens shutter using opening and closing blades.

As described above, the present invention uses a conversion means to convert the driving force for displacing the opening blade group in the charging direction within a predetermined time after the end of the exposure operation into the driving force for causing the opening blade group to perform the opening operation. Since it is configured to share the same, it is reliable in operation without requiring a dedicated driving force, and is advantageous in terms of space and shutter configuration.
The benefits are enormous.

[Brief explanation of the drawing]

1 to 3 show a first embodiment according to the present invention,
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. FIGS. 4 and 5 are front views of a second embodiment of the present invention, showing a state in which the shutter is charged and a state in which the shutter has completed a series of operations, respectively. FIGS. 6 and 7 are front views of a third embodiment of the present invention, showing a state in which the shutter is charged and a state in which the shutter has completed a series of operations, respectively. In the figure, 1 is a substrate, 2 is a presser plate, 3 is a group of open blades,
4,204 is an opening member, 5 is an opening auxiliary member, 6 is a closing blade group, 7 is a closing member, 8 is a threshold chain auxiliary member, 9,209 is an opening drive member, 10,310 is a connecting member, 11,211
indicates a conversion member, and 12 indicates a bottle.

Claims (1)

[Claims] 1 Opening and closing blades sequentially open and close the opening to perform an exposure operation, and within a predetermined time after the exposure operation is completed, only the opening blade is displaced in the charging direction to cover at least a portion of the opening covered by the closing blade. In an additional covering type camera shutter, an opening member 4 having a side portion 4d and for opening the opening blade, and an opening driving member 9 having a driving force 9f for opening the opening member 4. , a connecting member 10 that connects the opening member 4 and the opening drive member 9 when the opening blade is in the opening operation, and that can release the connection in the region where the exposure operation ends; and a drive for closing the closing blade. 211. A closing member 7 having a cuff f and a conversion member 11 for transmitting the driving force 9f of the opening drive member to the side 4d of the opening member; 211.
12, at the end of the exposure operation, the closing member 7
presses and rotates the connecting member 10 to release the opening member 4.
and the opening drive member 9 is released, the converting member 11; 211.12 presses the side portion 4d of the opening member to displace the opening member 4 in the charging direction. Features a camera shutter opening/closing device.