JPS6028333B2 - Photography equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photographing device for photographing a subject on a recording medium.

In photographic devices such as rotary cameras and flat-bed cameras that continuously photograph subjects on long microfilms, unexposed spaces may be formed between frames on the film, and fog may occur. In order to prevent the leading edge area of the film from being photographed, a so-called blank feed is carried out in which the film is fed through the exposure section without photographing.

This jump feed is configured such that the film is automatically fed through the exposure position by manually operating the jump feed switch, and the film stops when the jump switch is released. With this type of camera, the operator cannot accurately determine the amount of film that has been fed, leading to problems such as unnecessary film feeding or too little film feeding. This problem can be solved by measuring the amount of film feed and displaying the amount on a display, but this method requires a special measuring device and display, making the device complicated and expensive. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a photographing device capable of measuring and displaying the amount of film feed without adding any special parts.

In order to achieve this object, the present invention allows a counter that counts the number of times a subject is photographed to count the amount of film feed instead of the number of times the object is shot, and displays the amount of air feed on a display that displays the number of times the subject is shot. It is characterized by being configured to allow

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a rotary camera, where 1 is a supply reel, 2 is a take-up reel, and 3 is a supply reel with a microfilm F held in a roll held between the supply reel 1 and an IJ reel for supplying the film. 4 is a document feed roller, 5 is a document discharge roller,
6 is an illumination lamp; 7 is an imaging lens that is illuminated by the lamp 6 and projects an image of the original 8 onto a film; and 9 is a slit plate arranged at the photographing position. The document 8 is fed by rollers 4 to a photographing position illuminated by a lamp 6, and after passing through the photographing position at a constant speed, is discharged by rollers 5. A film feed roller 3 rotates in synchronization with the document feed, and an image of the document is photographed on a film using a slit exposure method. Manuscript 8
The film feed roller 3 is configured to stop when the film passes the photographing position. FIG. 2 shows the control circuit of the camera, where S is a switch that detects a document sent to the photographing position, and generates a count pulse signal every time one document is sent to the photographing position.

S2 is a switch that operates in response to the rotation of the film feed roller 3, and generates a count pulse signal every time the film is fed by one length due to the rotation of the roller 3. S3 is a dry feed switch, which is an automatic return type switch, and is manually operated by the operator, turning on when pressed and turning off when released. The switch S2 is turned on and off by a cam provided coaxially with the film feed roller 3, for example. 10 is an AND gate that gates the count pulse signal from the switch S2, 11 is an OR gate, and 12 is an inverter.

15 is a counter that adds and counts the count pulse signal generated from switch S or S2.

16 is a memory circuit that stores the number of times of photographing.

17 is an AND gate that transfers the contents of the counter 15 to the memory circuit 16; when a high level signal is sent from the inverter 12 to the AND gate 17 as a control signal, the contents of the counter 15 are transferred to the AND gate 17;
The contents of No. 5 are transferred to the memory circuit 16, the number of times of photographing is stored in the memory circuit, and the counter 15 is cleared.

18 is a counter 1 for counting the number of shots stored in the memory circuit.
When the high level signal is sent to the AND gate 18 as a control signal by turning off the empty feed switch S3, the counter 15 is cleared and the number of shots stored in the memory circuit 16 is displayed on the counter. Moved to 15th.

19 is a segment decoder that converts the contents of the counter 15 into segments, and 20 is a display that displays the contents of the counter 15 in 7 segments.

20 is a motor drive circuit, and M is a film drive motor connected to the film feed roller 3.

In the camera described above, the counters 1 and 5 normally count the number of shots, and the number of shots is displayed in five digits on two displays (all digits are displayed).

That is, each time the document 8 is sent to the photographing position and photographed, the switch S. is activated, and the count pulse signal from the switch S passes through the OR gate 11 and is counted by the counter 15. The contents of the counter 15 are displayed on the display 20 via the segment decoder 17 as the number of times of photographing. Next, when the jump feed switch S3 is turned on to instruct the film to jump without shooting, the low level signal from the switch S3 drives the motor M via the motor drive circuit 21, and the film feed roller 3 The film F is fed by the rotation of the film F.

On the other hand, by operating the dry feed switch S3, the inverter 12
The output of becomes high level, and this high level signal opens the AND gate 17, clears the counter 15, and transfers the contents of the counter 15 to the memory circuit 17.
The counter 15 is switched as a device for measuring the amount of film feed. As the film is continuously fed, the switch S2 is turned on and off each time the film is fed one step, and the count pulse signal generated from the switch S2 passes through an AND gate 10 and an OR gate 11 and is counted by a counter 15. . The contents of this counter 15 are displayed on the display 20 as only the last three digits as the film feed amount (unit arc). In the case of a jump feed, the first two digits of the display 20 are not displayed due to the high level output signal of the inverter 12, so that the display of the number of shots and the display of the jump feed amount are distinguished. When the hand is released from the jump feed switch S3 after the film has been fed a predetermined amount, the jump switch S3 is turned off, the motor M is stopped, and the film F is no longer fed quickly. On the other hand, switch S
3 is turned off, the AND gate 18 is opened, the counter 15 is cleared, and the number of shootings stored in the memory circuit 16 is transferred to the counter 15. Thereafter, when the photographing operation is started, the contents of the counter are increased, the number of times of photographing after the free feed is added to the number of times taken before the free feed, and the total number of times of shooting is displayed on the display 20.

It should be noted that it may be configured such that when the film is skipped by one frame, a count pulse signal is generated to count the amount of blank feed.

As described above, according to the present invention, the amount of jump feed of a recording medium such as a film can be measured and displayed without adding any special parts, so the amount of jump feed can be accurately adjusted, and the device can also be easily adjusted. It's easy and cheap.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a rotary camera to which the present invention is applied;
FIG. 2 is a diagram showing a control circuit of the camera. 3...Film feed roller, 4...Document feed roller, 5...Document discharge roller, 15...
...Counter, S3...Jump feed switch. Figure 1 Figure N Ship

Claims (1)

[Claims] 1 In a photographing device that uses a counter to count the signals generated each time an original is photographed on film, and displays the contents of this counter on a display, there is a jump feed switch, and when the jump switch is operated, the film is skip-fed. a film feeding means that switches, a signal generation means that generates a signal every time the film is fed a certain length by the film feeding means, and a signal generation means that clears the counter when the film feed switch is operated to start the shooting. and means for inputting a signal generated from the signal generating means to the counter.