JPH03287242A - Camera with consecutive photographing device - Google Patents

Abstract

PURPOSE:To carry out consecutive photographing interlocked with a film taking up mechanism by discharging the charge of an integration capacitor in one- frame photographing, and having a timing switch for discharging the charge of the integration capacitor in the consecutive photographing. CONSTITUTION:A sprocket switch 39, a capacitor 40, and transistors 41 and 42 form the control circuit of a film taking up motor 35, and a shutter circuit 45 is provided with the integration capacitor 47 integrating the converting current of a photoelectric conversion element 46 carrying out the photoelectric conversion of object light. An opening/closing switch 55 serves as an operating switch changing over a one-frame photographing mode, and it is closed to carry out the switching to the consecutive photographing mode. Then, the charge of the integration capacitor 47 is discharged at every depressing operation of a shutter button in the switching to the one-frame photographing, and the charge of the integration capacitor 47 is discharged in response to the sprocket switch 39 in the switching to the consecutive photographing. Thus, interlocking to the film taking up mechanism can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a camera equipped with a continuous shooting (hereinafter referred to as "continuous shooting") device linked to a film winding mechanism.

"Prior Art" FIG. 3 is a circuit diagram showing an example of a conventional camera film winding mechanism.

In this figure, 11 is a battery power source, and 12 is a changeover switch that is linked to the shutter button. This switch 12 is normally closed to terminal a, and is switched from terminal a to terminal S in accordance with the pressing operation of the shutter button.

A sprocket switch 13 mechanically interlocks with the shutter and sprocket, which is normally connected to terminal a, and is switched to terminal a in conjunction with shutter operation. Then, this switch ↓3 returns to terminal a in conjunction with the sprocket when one frame of film is wound up.

The diode 4, the capacitor 15, and the transistor 16 form a timer, and the transistors 17 and 18 form a switch circuit that conducts in accordance with the output of the timer to supply power to the film winding motor 19.

Further, the film winding motor 19 rotates in the forward direction when the forward/reverse switching circuit 20 is turned on as shown by the solid line in the drawing, and rotates in the reverse direction when the film winding motor 19 is switched to the state shown in the dotted line.

In addition, 21 is a detection switch for detecting the end of rewinding, which is closed when the film is loaded into the camera, and 22 is a shutter circuit.

The shutter circuit 22 includes a photoelectric converter for subject light, an integrating capacitor for photoelectric conversion signals, and an arithmetic circuit that calculates a shutter time using the integrated voltage of this capacitor as subject light information.

The above film winding mechanism operates when the shutter button is pressed.
When the middle stage is pressed down, the changeover switch 12 is switched from terminal A to terminal S.

This operation charges the timer capacitor 15 and supplies power to the shutter circuit 22.

The shutter circuit 22 opens the shutter in conjunction with the pressing operation of the shutter button to the lowest position, and closes the shutter under the exposure control of this circuit 2(3)2.

When the shutter is closed, the sprocket switch 13 is switched from terminal a to terminal S in conjunction with the shutter closing operation.

In this state, when the shutter button is released, the selector switch 12 switches from terminal to terminal a in conjunction with the return movement of the shutter button, and power is supplied to the transistors 16 and 17. As a result, the transistor 16 is connected to the capacitor. 15's discharge current is input to the base and turned on, and transistor 17 is turned on.
let

Since the transistor 18 is turned ON by the operation of this timer, the terminal a of the changeover switch 12, the forward/reverse changeover circuit 2
0 (solid line), the battery power supply current flows through the path of the motor 19 and the transistor 18, and the motor 19 rotates forward to wind up the film.

When one frame of film has been wound, the sprocket switch 13 switches from terminal A to terminal a.

Therefore, when transistor 17 is turned off, transistor 18 is turned off, and motor 19 is stopped.

(4) As described above, the film is wound every time a photograph is taken.

If the forward/reverse switching circuit 20 is switched as shown by the dotted line in the state shown in FIG. 3, the motor 19 will reverse and the film will be rewound. When the rewinding is completed, the detection switch 21 will be opened and the motor 19 will stop. .

``Problem to be Solved by the Invention J'' In the film winding mechanism described above, the sprocket switch 3 is mechanically linked to the shutter closing operation to switch to the terminal A, and is not linked to the sprocket to switch to the terminal A.

For this reason, in a camera equipped with a zoom lens or a tele-wide lens with a built-in shutter, the shutter moves, making it difficult to construct an interlocking mechanism between the shutter and the sprocket switch 13.

Further, since the interlocking mechanism between the shutter and the sprocket switch 13 has a complicated structure including an interlocking lever and the like, the space for installing the interlocking mechanism has been a problem even in a camera with a fixed shutter.

Furthermore, in cameras equipped with the film advance mechanism described above, the film cannot be advanced unless the shutter button is moved backwards, so in order to provide a continuous shooting function, a separate continuous shooting circuit or mechanism must be installed. However, problems such as limited space for incorporating parts and increased costs led to the fact that such cameras were rarely equipped with a continuous shooting function.

In view of the above-mentioned circumstances, the present invention aims to develop a film winding mechanism that does not require a mechanical interlocking mechanism between a shutter and a sprocket switch, and to develop a camera equipped with a continuous shooting device that is linked to this film winding mechanism. The purpose is to

"Means for Solving the Problem" In order to achieve the above-mentioned object, in the present invention, as a first invention, an integral capacitor that is charged via a resistor member that determines the shutter time is charged once when the shutter button is pressed. In a camera equipped with a shutter circuit that calculates the shutter time based on the charge voltage of the integral capacitor that is discharged and then charged, the timer that starts in response to the shutter closing operation and the timer time of this timer. The film winding mechanism includes a switching element for supplying power to the film winding motor, which is electrically conductive, and a braking circuit that brakes the film winding motor in response to a sprocket switch that operates when one frame of film is wound and stops the operation of the timer. At the same time, a switch is provided to selectively switch between single frame shooting mode and continuous shooting mode, and when switching to frame shooting mode, the charge in the integral capacitor is discharged each time the shutter button is pressed, and continuous shooting is performed. In this case, we propose a camera equipped with a continuous shooting device, characterized in that it is equipped with a timing switch that discharges the charge of the integrating capacitor in response to the sprocket switch.

As a second invention, an integral capacitor that is charged via a resistor member that determines the shutter time is discharged once in accordance with the pressing operation of the shutter button, and then the shutter time is determined based on the charging pressure of the integral capacitor that has been charged. In a camera equipped with a shutter circuit that performs calculations (7), there is a timer that starts in response to the shutter closing operation, a switching element for supplying power to the film winding motor that conducts during the timer period of this timer, and a switching element that supplies power to the film winding motor when one frame of film is wound. The film winding mechanism includes a braking circuit that brakes the film winding motor in response to a sprocket switch that operates and stops the operation of the timer, and discharges the charge of the integrating capacitor in response to the sprocket switch. To propose a camera equipped with a continuous shooting device characterized by being equipped with a timing switch that allows

"Operation" The camera of the first invention described above operates as follows by switching to the single-frame shooting mode.

That is, when the shutter button is pressed down, the shutter opens and the charge in the integrating capacitor is temporarily discharged. Subsequently, this capacitor is charged through the resistor member that determines the shutter time, and the shutter circuit calculates the shutter time based on the charging voltage of the integrating capacitor, and closes the shutter according to (8) at this shutter time.

Further, a timer is started by the shutter closing operation, and the power feeding switching element is made conductive during the timer period.

From this, the film is wound up in accordance with the shutter closing operation.

When one frame of film has been wound, the timer stops operating, and the braking circuit operates in accordance with the operation of the sprocket switch to stop the film winding motor.

On the other hand, by switching to continuous shooting mode, the following operations occur.

That is, when the shutter button is pressed down and the shutter operation is completed, the film is wound one frame, and the charge in the integrating capacitor is immediately discharged in response to the elapse of the timer time. Therefore, the integrating capacitor is charged by the photoelectric conversion current, and the shutter circuit calculates the shutter time for the next photographing and controls the shutter.

As long as the shutter button is kept pressed, the above operation is repeated to take continuous pictures.

The second invention does not include a switch for switching between single-frame shooting mode and continuous shooting mode, so when the film is wound one frame, the film immediately shifts to the above-described continuous shooting operation. .

"Example" Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a circuit diagram of a camera of the present invention related to a continuous shooting device, in which 31 is a battery power supply, 32 is a main switch, and 33 is a shutter switch that is closed in conjunction with the pressing operation of the shutter button.

34 is a switch circuit for feeding power to the film winding motor 35, which includes a transistor 34a that functions as a power feeding switch;
It is composed of a transistor 34b which provides a slight delay time for the ON operation of this transistor 34a.

The diode 36, the capacitor 37, and the transistor 38 form a timer, and the transistor 38 is turned on during the timer time to turn on the above-mentioned power supply switch circuit 34.

Reference numeral 39 denotes a sprocket switch, which has a configuration as shown in FIG. 2 as an example.

That is, a rotating plate 27 fixed together with the sprocket 26 is provided on the sprocket shaft 25, and a notch 27a is formed in a part of the periphery of the rotating plate 27.

Further, the operating arm 39a of the sprocket switch 39 is provided with a protruding portion 39b that can freely enter into the notch 27a, and a spring 28 is provided on the operating arm 39a to keep the protruding portion 39b in contact with the rotating plate 27 at all times. The configuration is such that they are in contact with each other.

The sprocket switch 39 described above is inserted into the terminal a with the protrusion 39b inserted into the cutout 27a, and when the sprocket 26 rotates while the motor 35 is started, the protrusion 39b that has escaped from the cutout 27a is turned on. It comes into contact with the periphery of the rotary plate 27 and switches to a terminal.

When the film is wound up one frame, the protrusion 39b again enters the notch 27a, and at this point the terminal b (11) is switched to the terminal a.

The sprocket switch 39, capacitor 40, and transistors 41 and 42 form a braking circuit for the film winding motor 35.

Further, 43 is a forward/reverse switching circuit for the film winding motor 35, and 44 is a detection switch that closes when a film is loaded.
45 indicates a shutter circuit.

As shown in the figure, the shutter circuit 45 includes an integrating capacitor 47 that integrates the converted current of a photoelectric conversion element 46 that photoelectrically converts subject light.

The integrating capacitor 47 discharges its charge by the temporary ON operation of transistors 1 to 48, which operate as timing switches, and then integrates the photoelectric conversion current as subject light information. In other words, the shutter switch 33 is closed by pressing the shutter button, and a differential pulse current flows through the capacitor 49, and the transistor 48 is temporarily turned on immediately before or at the same time as the shutter is opened.
Then, the charge in the integrating capacitor 47 is discharged.

Note that if the camera is not used for a long time,
) Since there is no charge in the integrating capacitor 47, in this case, the transistor 48 operates as a short switch that is temporarily turned on.

The charge voltage of the integrating capacitor 47 is determined by the comparator 50.
The output of the comparator 50 is used to close the shutter.

That is, when the shutter circuit 45 is supplied with power in accordance with the pressing operation of the shutter button, the transistor 51 is immediately turned on by the low voltage output of the comparator 50, the electromagnetic mechanism 52 is excited, and the shutter is opened by this exciting operation. . After that, when the charging voltage of the integrating capacitor 47 reaches a predetermined value, the output of the comparator 50 becomes L.
The voltage changes from OW to High voltage, turning off the ONL transistor 51. As a result, the shutter held by the excitation of the electromagnetic mechanism 52 is closed.

In addition, a differential pulse is applied to the base of the transistor 53 by the high voltage output of the comparator 50, and this transistor 53 becomes ONL, and then the transistor 54
is ONL, the timer capacitor 37 is charged.

On the other hand, the open/close switch 55 is a switch for switching between a single frame photographing mode and a continuous photographing mode, and when the open/close switch 55 is opened, the mode is changed to the single frame photographing mode, and when it is closed, the mode is changed to the continuous photographing mode.

That is, even if the open/close switch 55 is closed, the transistor 56 is in the OFF state, but as will be described later,
When the film is wound one frame, the transistor 41 is turned off.
NL, this transistor 56 is also turned on.

As a result, the transistor 57, which operates as a timing switch during continuous shooting, discharges the charge in the ONL integration capacitor 47. Note that at this point, since the shutter button is still being pressed, the transistor 48, which operates as a timing switch for - frame photography, is in an OFF state.

When the charge in the integrating capacitor 47 is discharged as described above, the shutter circuit shifts to shutter opening/closing control for the next photographing.

Incidentally, a capacitor 58 connected to the base of the transistor 57 gives a slight delay to the ON operation so that the transistor 57 is turned ON after the film winding motor 35 has surely stopped.

In addition, the above-mentioned shutter circuit 45 is provided with a switch circuit 59 that keeps the shutter circuit from operating during winding and rewinding of the film.

Next, the operation of the camera of this embodiment will be explained.

a. By closing the main switch 32 with the single-frame photographing mode opening/closing switch 55 open and pressing down the shutter button in this state, the shutter circuit 45 is powered by closing the shutter switch 33. From this, the transistor 51 is turned on.
As a result, the electromagnetic mechanism 52 is immediately excited to open the shutter.

As already mentioned, the shutter circuit 45 includes the integrating capacitor 4
7 is released once, and then reaches a predetermined integrated voltage, the output (15) of the comparator 50 changes from Low voltage to High voltage, and the transistor 51 turns OFF, so that the electromagnetic mechanism 52 The shutter closes when the current changes to de-energized.

When the shutter is closed, the timer capacitor 37 is charged by turning on the transistors 53 and 54, and as a result, the timer transistor 38 is turned on, and the power supply switch circuit 34 is turned on after a slight delay.

That is, after a short delay time after the shutter is closed, the power supply switch circuit 34 is turned on, and the motor 35 rotates forward to wind the film. Thereby, it is possible to prevent the motor 35 from starting before the shutter is not reliably closed and causing photographic blur.

As already mentioned, when the motor 35 starts, the sprocket 2
6 rotates, and the sprocket switch 39 is switched to the terminal. This switching causes the charge in the capacitor 40 to be discharged.

When one frame of film is wound, the sprocket switch 39 is switched to terminal a, current flows temporarily through the capacitor 40, and the transistors 41, 42 (16) are temporarily turned on, braking the motor 35 and stopping it. At the same time, the charge of the timer capacitor 37 is transferred to the diode 3.
6 and the transistor 41, the timer transistor 38 is turned off, the power supply switch circuit 34 is turned off, and the film winding motor 35 is stopped.

In this manner, in this embodiment, once the shutter button is pressed, the film is automatically wound up by one frame following the shutter operation.

By switching the forward/reverse switching circuit 43 as shown by the dotted line in the figure, the motor 35 is reversed and the film is rewound, but in this case, since the switch circuit 59 is turned on, the timing transistor 48 remains non-conductive. The shutter circuit 45 is held so as to prevent its operation during film rewinding.

Further, when the rewinding of the film is completed, the detection switch 44 is opened and the motor 35 is stopped.

b. Continuous shooting mode For continuous shooting, the open/close switch 55 is closed.

In this case, by pressing the shutter button, a second photograph is taken in the same manner as above, but when the shutter is closed and the film is wound, the sprocket switch 39
is switched from terminal to terminal a, and transistors 41 and 42
is turned on and the film winding motor 35 is braked and stopped.

When the transistor 41 is turned on by the current of charge temporarily flowing through the capacitor 40, the 1-transistor 56 is turned on.
Then, the transistor 57, which operates as a timing switch for continuous shooting, turns on with a slight delay, and the charge in the integrating capacitor 47 is discharged. Due to this discharge, the output of the comparator 50 changes from a high voltage to a low voltage, and when the transistor 51 is turned on, the electromagnetic mechanism 52 is excited to open the shutter.

As a result, the integrating capacitor 47 is charged again by the photoelectric conversion current, and the shutter circuit 45 controls the shutter in the same manner as described above to perform the second photographing.

After the second shooting is completed, as long as the shutter button is pressed down, the camera moves on to the third shooting operation in the same manner as above, and from then on, film winding and shutter control are repeated in the same manner, and continuous shooting is performed. .

This continuous shooting is stopped by releasing the shutter button.

Generally, in continuous shooting, it is preferable to repeat shooting as quickly as possible. Therefore, it is possible to shorten the film winding time, but since there is a limit to shortening this time, continuous shooting can be accelerated by using a camera configuration that uses half-size film.

Note that in the case of a camera that uses half-size film, the film-frame winding operation is 1/2, so the rotary plate 27 that rotates together with the sprocket 26 has a second one at a position symmetrical to the notch 27a. Form a notch.

Further, as in the above-described embodiment, a continuous shooting device that does not require a mechanical structure is advantageous in speeding up continuous shooting because there is no delay in the operation of the mechanical structure.

Although the embodiments of the present invention have been described above, the capacitor 40 connected to the proceratoswitch 39 (19) can be replaced by a one-shot circuit, a pulse edge detection circuit, or the like.

Furthermore, in the case of a fixed shutter type camera, a resistor is provided to determine the shutter time in place of the photoelectric conversion element 46.

Furthermore, when implementing the present invention, it is possible to implement the present invention as a camera that takes continuous pictures immediately by pressing the shutter button without providing an opening/closing switch.

"Effects of the Invention" As described above, the camera according to the present invention is provided with a power supply switch that is turned on during the timer period of the timer that starts in response to the shutter closing operation to drive the film winding motor and to move the film frame. The motor is braked and stopped in response to a sprocket switch that is linked to the sprocket that is being rolled up, and the integral capacitor is temporarily discharged in response to the operation of the sprocket switch, so that it is linked to the film winding mechanism. It is possible to easily configure a continuous shooting device using an electric circuit structure (20), and in particular, there is no need to provide a separate circuit for the continuous shooting device, and there is no need for a mechanical structure or power energy for the mechanical structure. This is a camera equipped with a practically excellent continuous shooting device that does not.

[Brief explanation of drawings]

Fig. 1 is a camera circuit diagram showing an embodiment of the present invention, Fig. 2 is a perspective view showing an interlocking mechanism between a sprocket switch and a sprocket, and Fig. 3 is a circuit diagram of a film winding device provided in a conventional camera. It is. 31...Battery power source 33...Shutter switch 34...Switch circuit for power supply 35...Film winding motor 37...Timer capacitor 38...Timer transistor 39...Sprocket switch 40... ...Brake capacitor 41, 42...Transistor 43...Forward/reverse switching circuit 45...Shutter circuit 55...Open/close switch for continuous shooting switching 56...Transistor for continuous shooting 57...Continuous Transistor that operates as a timing switch for photography

Claims (2)

[Claims] (1) A shutter that discharges an integral capacitor that is charged via a resistance member that determines the shutter time in accordance with the pressing operation of the shutter button, and then calculates the shutter time based on the charging pressure of the integral capacitor that has been charged. In a camera equipped with a circuit, there is a timer that starts in response to the shutter closing operation, a switching element for supplying power to the film winding motor that conducts during the timer period of this timer, and a switching element that operates when one frame of film is wound to start the timer. It is equipped with a film winding mechanism consisting of a braking circuit that brakes the film winding motor in response to a sprocket switch that stops the operation, and a changeover switch that selectively switches between a single frame shooting mode and a continuous shooting mode. When switching to shooting, the charge in the integral capacitor is discharged each time the shutter button is pressed, and when switching to continuous shooting, the charge in the integrating capacitor is discharged in response to the sprocket switch. A camera equipped with a continuous shooting device. (2) A shutter that discharges an integral capacitor that is charged via a resistor that determines the shutter time according to the pressing operation of the shutter button, and then calculates the shutter time based on the charging pressure of the integral capacitor that has been charged. In a camera equipped with a circuit, there is a timer that starts in response to the shutter closing operation, a switching element for supplying power to the film winding motor that conducts during the timer period of this timer, and a switching element that operates when one frame of film is wound to start the timer. The film winding mechanism includes a braking circuit that brakes the film winding motor in response to a sprocket switch that stops the operation, and a timing switch that discharges the charge in the integral capacitor in response to the sprocket switch. A camera equipped with a continuous shooting device characterized by: