JPS5919930A - Automatically film sensitivity settable camera - Google Patents

Abstract

PURPOSE:To set the photographic sensitivity of even a long-sized film having no photographic sensitivity information, by detecting a film back being mounted and stopping the transmission of photogaphic sensitivity information from an automatic setting device to an exposure control circuit, and sending photographic sensitivity information from a manual photographic sensitivity setting device instead. CONSTITUTION:When the film back 2 is attached to a camera 1, a control circuit shown in a figure is constituted. The camera 1 is provided with a light source 29, automatic film sensitivity setting device 30, exposure control circuit 31, shutter release film advance control circuit 32, and switches 26 and 27. When the film back 2 is mounted on the camera 1, the switch 26 is changed over to the side of a terminal (c), so the film sensitivity information is inputted through a variable resistor 13 provided to the film back 2 and while film sensitivity setting is not performed from the side of the film back 2, the switch 2 is off, disallowing shutter release through the shutter release film advance control circuit 32.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera in which film sensitivity can be automatically set.

In order to prevent shooting failures due to forgetting to set the film sensitivity or setting it incorrectly, we use film that has sensitivity information in the form of perforations coded on a part of the film leader, and by reading that information, we can adjust the film sensitivity. A camera that automatically sets has been proposed.

However, this type of automatic sensitivity setting type camera has a drawback in that it is not possible to set the film sensitivity when a long length of film to which no sensitivity information is attached is cut into the necessary amount and loaded into a magazine.

SUMMARY OF THE INVENTION An object of the present invention is to provide a camera in which film sensitivity can be automatically set, even when using a long film that does not have sensitivity information.

In order to achieve the above purpose, when the long film hack is attached to the camera, the automatic sensitivity setting device installed on the camera is disabled, and only the manual sensitivity setting device installed on the film hack side or the camera side can be activated. We have adopted a configuration that makes it possible to

The present invention will be explained below using the drawings.

FIG. 1 shows a plan view of a camera 1 with a long film back 2 attached thereto. The film back 2 is provided with an i-film sensitivity manual setting member 11 and a sensitivity lock release member 8.

The film sensitivity setting member 11 and the sensitivity lock release member 8
The details will be explained next.

FIG. 2 is a perspective view of a film back side mechanism showing an embodiment of the present invention, and shows a state where the film back side mechanism is attached to a camera and film sensitivity is set. The lever 3 is rotatably supported by a fixed shaft 4 and receives counterclockwise torque by a spring 6 stretched between it and a fixed pin 5. The L-shaped tip 3a can go in and out of the opening 2a of the film hack, and the pin 3b implanted at the other end projects into the opening Ia of the lever 7. The lever 7 is rotatably supported on a common fixed shaft 4 with the lever 3, and a spring 9 is stretched around the fixed shaft 4 between the levers 3 and 7.
receives clockwise torque. Middle part 7 of lever 7
A pin 10 is implanted in B, and a knob 8 of a sensitivity lock release member is fixed to Q#11. A film sensitivity setting dial 11 is fixed to the upper end 12a of the shaft 12. The lower end 12b is connected to the adjustment shaft of the variable resistor 13, which is a film sensitivity setting element. Groove row 14 on the edge
A disk 14 having a grooveless outer peripheral portion 14b is fixed to the intermediate portion 12c. A pin 1 is attached to the bottom surface of this disc 14.
5 has been planted. The disk 14 has a fixed pin 16 and pin 1
A counterclockwise torque is applied by a spring 17 applied between the terminal and the terminal 5. The groove array 14aK is configured to be engageable with the tip 7c of the lever 7.

FIG. 3 is a plan view showing the mechanism on the film hack side, with no camera attached.

The lever 18 is rotatably supported around a fixed shaft 19, and one end 18a is located below the disc 14 and can engage with the pin 15. The other end 18b is in contact with the left end surface 20a of the shaft 20. The shaft 20 is slidably supported in another hole 2b of the film back. A spring 21 stretched between the wall of the film back and the shaft 20a biases the shaft 20 in the direction of ). The counterclockwise torque of the spring 17 stretched between the pin 15 and the fixed pin 16 is transmitted to the lever 18 via the pin 15 and becomes a rightward urging force on the shaft 20.

This rightward biasing force is set to exceed the sum of the left biasing force of the spring 21 and the left biasing force applied to the shaft 20 by a switch 27, which will be described later. The fixing pin 22 is a pin that limits the rotation range of the lever 18. Contact points 23 and 24 are connection points with the camera 1, which are fixedly installed on the wall portion 2c of the film hack.

4 and 5 are plan views including a partial cross section of the camera 1 with the film back 2 attached.

Fixed contact 2 on the film back side inside the camera 1
The contact 25 connected to the switch 2 is a movable contact that is slidably supported by the wall 1a on the camera side and the fixed part 1b.
The sections 26a and 26a of 6 are biased downward. The switch 26 operates so that when the film back is not attached, the sections 26a and 26b are on and the sections 26a and 26c are off. Switch 27 is a normally closed switch. A contact 28 connected to the fixed contact 24 on the film back side is a contact fixed to the wall 1c of the camera.

FIG. 6 shows the control circuit when the film back 2 is attached to the camera 1. The camera side 1 includes a power supply 29, an automatic film sensitivity setting device 30, an exposure control circuit 31, a shirt release/film winding control circuit 32, and switches 26 and 27 shown in FIG. When the switch 27 is off, shirt release is impossible.

On the film back side 2, there is a variable resistor 13 shown in FIG.
There is.

The operation will be explained below.

The film back 2, which is not attached to the camera 1, is in the state shown in FIG.

That is, due to the bias of the spring 6, the lever 3.7 is rotated counterclockwise to the limit position (the contact point between the lever and the wall), and the tip of the lever 7 Zh: 7c and the disc 14
is not engaged.

Therefore, the disk 14 is also rotated by the bias of the spring 1γ, and the pin 15 is rotated to a position limited by the end 18aK of the lever 18.

When the film hack 2 is attached to the camera 1, the tip 3a of the lever 3 comes into contact with the wall 1d of the camera and is pushed back into the film back, as shown in FIG. and rotate in the special training direction. Therefore, the lever 7, which is connected to the lever 3 by the spring 9, also rotates in the same direction, and the tip 7c comes into contact with the outer peripheral portion 14b of the disc. The amount of movement of the tip 7c still remains, but the outer peripheral portion 14b
After contacting the spring 9, the spring 9 stiffens and absorbs it. The fixed contacts 23, 24 on the film hack side are respectively connected to contacts 25, 28 on the camera side, and the movable contacts 25 are pushed into the camera by the contacts 23 against the bias of the switch piece 26a, so that the switch 26 is Section 26a
126b is off, 26. ．． 26c is switched on.

Further, the correction switch 27 is turned off when the tip 20bKj of the shaft 2o protrudes through the hole 1e of the camera.

) If Film Hack 2 is not installed (3rd
Np, in FIG. 6, the switch 26 on the camera side is a,
l) is on, and switch 27 is on, so
In response to information read from the film by the automatic sensitivity information setting device 30, an exposure control circuit 31 determines exposure, and a shirt release/film winding control circuit 32 controls exposure, film winding, and stopping.

(Omi: When the Film Hack 2 is attached to the camera 1 (Fig. 4), the circuit state is as shown in Fig. 6. In other words, since the switch 26 is switched to the C terminal side, the film sensitivity input is input to the film back. However, in this state where the film sensitivity is not set from the film back side, the switch 27 is off, so the shirt release/film winding control circuit 32 Tallerize is impossible.

To set the film sensitivity, pull the knob 8 of the sensitivity lock release member shown in FIG. Rotate in the open direction. indicator 2d
When the sensitivity droplet 11a is aligned with the lock knob 8, the lever tip 7c engages with one of the groove rows 14a of the disk, holding the disk in place (FIG. 2). Therefore, the variable resistor 13 is also fixed in a state corresponding to the sensitivity value 11a. When the disk 14 rotates clockwise, the implanted pin 15 also rotates in the same direction, so the lever 18, which is biased leftward by the spring 21, rotates counterclockwise. While the disk 14 rotates until it reaches a position where the lever tip 7c engages with its first groove 14c, the switch 27 is turned on due to leftward movement of the shaft 20. The state with this sensitivity setting is @5
FIG. 7 is a plan view of FIG. 6, and shows the state in which the switch 2γ is turned on in FIG. Therefore, after setting the sensitivity, circuit 3
2 enables shutter release.

→ When film hack 2 is removed from camera 1, lever 3 rotates counterclockwise due to the bias of spring 6, and lever 7
The lever also returns to its driven state, and the engagement between the lever tip 7c and the groove array 14'a of the disc is released. The disc 14 is rotated counterclockwise by the bias of the spring 17. Therefore, the state returns to the state shown in the plan view of FIG.

In this embodiment, the shirt release is not possible unless the film sensitivity is set, but a warning may be displayed instead.

In the above embodiments, the manual sensitivity setting member was provided on the film back side, but the present invention is not limited thereto, and may be provided on the camera side.

In this case, as shown in FIG. 7, a transmission member 2a is provided on the film back side to transmit the installation of the film back to the camera side, and this transmission member 2a is used to switch the changeover switch 26 to the variable resistor 13 side. good.

According to the present invention, as described above, even if a long film hack loaded with film without sensitivity information is attached to a camera that can automatically set the film sensitivity, it is possible to set the film sensitivity automatically from the film hack side or at the camera's discretion. It is possible to set the sensitivity, so you can take pictures without any problems.

[Brief explanation of drawings]

Figure 1 is a Thl/- side view of the main long film back attached to the camera, Figure 2 is a perspective view showing the film hack side mechanism of the embodiment of the present invention, and Figure 3 is a perspective view of the film hack side mechanism. The plan view, Figures 4 and 5 are plan views including a partial cross section of the film hack attached to the camera, Figure 6 is the control circuit when the film hack is attached to the camera, and Figure 7 is a separate diagram. The control circuit of the embodiment is shown. [Explanation of symbols of main parts] 1...Camera 2...Long film back 23, 24, Contacts...Switching device 30...Sensitivity automatic setting device Applicant: Nippon Gengaku Kogyo Co., Ltd. 1 figure spear 2 figure spear 3 figure spear 4 figure spear 5 figure r O 6 figure spear '7 figure

Claims (1)

[Claims] A camera that has an automatic sensitivity setting device that detects film sensitivity information given on a film and sends the information to an exposure control circuit, and that is capable of attaching a long film back, and that detects attachment of the film back. and a switching device that cuts off the sending of the sensitivity information from the automatic setting device to the exposure control circuit and instead sends the sensitivity information from the manual sensitivity setting device to the exposure control circuit to manually set the film sensitivity. A camera with automatic sensitivity settings.