JPS58125030A - Operation controlling circuit of camera - Google Patents

Abstract

PURPOSE:To make monitoring of frame counting unnecessary and to eliminate wasteful photography, by stopping automatically the operation of a camera temporarily for a number of frames where the normal photography is possible and starting the operation of the normal photography mode by the second release operation. CONSTITUTION:When a switch 6 is turned on, the sequence operation is advanced in the state preset to higher shutter speeds. This operation is continued during the time from ''S'' of a counter to ''X''; and when the switch 6 is turned off after the photographic operation in the position of the second ''.'' is terminated, FFs 12-14 are inverted, and Q outputs become ''1'', and the sequence operation of the camera is stopped. When a release switch is turned on in this state, a reset pulse is led in to reset FFs 12-14. Simultaneously, the sequence operation is started, and photography for ''1'' of the counter is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an operation control circuit for an automatic exposure control camera capable of continuous shooting with a built-in or attachable electrically driven film winding mechanism, and the first few frames when loading the film are taken using a high-speed shutter. The present invention relates to an operation control circuit in a camera that performs second-time control and shifts to a regular shooting mode after a certain number of frames have been released.

Conventionally, various methods have been proposed for rapidly winding the film up to the number of frames at which shooting starts by winding the film without controlling the shutter for a period of time when a certain number of frames (g) is reached when loading the film. Among automatic exposure control cameras, cameras that automatically switch the shutter time control 1 during this period to high-speed shutter time control have been put into practical use. In cameras of this type, a switch is provided that is linked to the frame counter and turns on and off during film winding when the camera is in the normal shooting mode or reaches the possible number of frames, and the switch turns on and off from the time the film is loaded. During period 1, the shutter speed is preset at the shutter speed or halfway. If a camera using such a conventional method is equipped with a built-in electric drive device to enable continuous shooting, the operation will continue even after the number of frames that can be taken is reached. The drawback was that it was difficult to tell whether the camera was in shooting mode unless you were looking at frame number 4.

The purpose of the present invention is to obtain a camera operation control circuit that improves the drawbacks of the conventional method as described above.The purpose of the present invention is to dynamically stop the camera operation once the number of shots that can be taken is normal, and then restart the camera operation control circuit. The normal shooting mode is started by the release operation.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a circuit diagram for explaining the operation of the camera of the present invention and a diagram showing a display of a number of sheets.

In the figure, l is a power supply battery, 2 is a transistor for both power supply circuits, 3Fi resistor, 4 is a power switch linked to the shutter release, 5 is a block representing the camera's electric circuit, and 6i-i is linked to a photo counter. It's a switch. In the figure, when power switch 40 is on, transistor 2
conducts, power is supplied to the circuit 5, the circuit 5 is put into operation, and a power holding signal is output from the terminal H to keep the transistor 2 in the on state.

In this state, the switch 6 linked to the sheet count is turned on when loading the film, and a low level (0°) signal is generated. FIG. 2 is a circuit connection diagram showing an embodiment of the camera operation control circuit according to the present invention.

In the figure, 11 is a pull-up resistor, 6 is the first switch; 12 is a switch linked to the number counter corresponding to 6A in Figure 1;
Reference numerals 13 and 14 are rise-synchronous flip-flops, respectively, and 15 is an AND gate. Note that terminal ■ is a power supply voltage supply terminal, oLxii clock pulse input terminal, and PL
These are the iLi shutter Bricella f1 (second time signal) output terminal and the lj discrimination clock input terminal, a stop signal is output from the terminal S, and a reset signal is input from the ps.

In the circuit shown in the figure, when the switch 6 is on, the D input of the flip-flop 12 is at the "O" level, and the output of the flip-flop 12 is also at the "0" level.
30D input is also NO'', and its Q output is also on level. In this state); j The output of AND gate 15 is also O'' level, and no matter what signal enters the flip-flop 14d, its Q output will be on level. The output becomes on level. Therefore, when the stop signal, which is the Q output of No. 14, is at the '0'' level, the sequence operation proceeds with the shutter speed always being preset to a high speed speed by a signal from the shutter preset signal terminal PL.

After the photographing operation at the second 1.'' position is completed, when the switch 6 is turned off in the clear winding operation, the D input of the flip-flop 12 changes to a high level (``1''), and as a result, the 7th flip-flop 12, 13 and 14 are all inverted, and the Q output (stop signal) of 14 becomes "1" level.

Therefore, the sequence operation of the camera is stopped by this stop signal.

Note that in this stop state, the power hold signal shown in Figure 1 is no longer generated, so the release switch (power switch 4
), the power supply will stop.

When the release switch 4 is turned on again from this state, a reset pulse is supplied from the input terminal R8, and the flip 7
All bits 12, 13 and 14 are reset.

At the same time, a sequence operation is started by a shutter preset signal from terminal PL, and a total of "1" images are taken. At this time, since the switch 6 is at the "1" level from the beginning, the clock input to the flip-flop 14 is at the "1" level. Since the output, ie, the stop signal, is at the '0' level, the operation does not become a stop sequence. In this state, the shutter preset (for example, 1/1(8)see) is canceled and photography is performed in the normal photography mode.

As described above in the embodiments, the control circuit of the present invention performs a release sequence operation of a fixed number of frames at a preset high-speed shutter speed when loading film into a camera and winding the film to the first shooting position. This release operation is temporarily stopped at the first shooting position, and then normal shooting begins with the release operation again, so even when the camera is driven in continuous shooting mode by electric drive, it is always at the first shooting position. Since the sequence operation is automatically stopped at , there is no need to carefully monitor the frame count, and there is no need to take unnecessary shots. is a great thing.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of main parts and a front view of a number counter for explaining the operation of the camera of the present invention, and FIG. 2 is a circuit connection diagram showing an embodiment of the operation control circuit of the camera according to the present invention. 1----Power battery, 2----Switching transistor, 3-Resistor, 4----Power switch・5-m
-Camera electrical circuit, 6~ Switch linked to photo counter, l 1---Pull-up resistor, 12° 13.14
．． ----7 lip 70 tube circuit, 15---AND gate, ■------ Generator supply terminal, 0LK--- Clock pulse input terminal, PL---- Shutter preset signal input terminal, R --1 discrimination clock input terminal, 5-
--Stop signal output terminal, R8---Reset signal input terminal. Patent applicant Canon Co., Ltd. 2' layer

Claims (1)

[Claims] In a camera that has a built-in or attached electric drive film winding mechanism and is capable of continuous shooting, a switch means linked to the film count of the camera is provided, and by switching the switch means, the number of shots can be changed from the first release operation when loading the film. The camera operation control is characterized by comprising a control means for dynamically stopping the shutter of the camera during the sequence operation up to the normal number of shots, and for causing the camera to perform shooting in the normal shooting mode by the release operation again. circuit.