JPH11183979A - Film integrated type camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent shock noise from being made because a main capacitor is short-circuited by discharging charge stored in the main capacitor in the case of disassembling the camera main body of a film integrated type camera or pulling out a power source for a strobosope from the camera main body. SOLUTION: In the stroboscopic circuit of the film integrated type camera, a discharge circuit SC having a resistance R4 is connected to the main capacitor MC in parallel. Thus, by detaching the power source BT from the battery chamber of the camera main body, the charge stored in the capacitor MC is discharged by the resistance R4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film-integrated camera with a built-in flash (film unit with a lens) having a built-in flash, wherein a power source for the flash is removed from the camera body or the camera body is disassembled. The present invention relates to a film-integrated camera in which electric charges accumulated in a main capacitor of a flash circuit are self-discharged.

[0002]

2. Description of the Related Art In the case of a film-integrated camera, in which unexposed roll film is stored in advance and sold at the time of manufacture of the camera body, the camera body is handed over to the contractor after the entire film is shot. When the photographed film is taken out, it is disassembled by a recycling processor and the usable parts are recycled.

Further, in a film-integrated camera with a strobe provided with a strobe integrated with the camera body, electric charges required for strobe light emission are stored in a main capacitor of the strobe circuit. In order to minimize the consumption of the flash battery, the main capacitor is said to have less waste as the leakage current is smaller.

[0004]

However, in such a film-integrated camera using a main capacitor having a small leak current, once electric charge is accumulated in the main capacitor, the strobe is not charged for a few days. It hardly drops below the light emission voltage. Therefore, when the above-mentioned recycling processing company disassembles the camera body,
When a metal bar such as a screwdriver is used, the metal bar may touch the terminal of the main capacitor, short-circuit, and generate a shock noise.

Therefore, the present invention can effectively prevent the generation of a shock noise due to the main capacitor being short-circuited when at least the strobe power is removed from the camera body or when the camera body is disassembled. The purpose is to provide a film-integrated camera.

[0006]

According to the above object, according to the first aspect of the present invention, there is provided a film-integrated camera in which a strobe is integrated with a camera body in which an unexposed roll film is stored in advance. A discharge circuit having a resistor for discharging the electric charge accumulated in the main capacitor of the strobe circuit by removing a power source such as a dry battery is connected to the strobe circuit disposed in parallel with the main capacitor. According to the first aspect of the invention, the electric charge stored in the main capacitor flows to the discharge circuit and is gradually discharged by the resistor.

According to the second aspect of the present invention, there is provided a film-integrated camera having a strobe integrated with a camera body in which an unexposed roll film has been stored in advance. An open / close switch that closes by retreating the open / close switch operating means by disassembling the camera main body, and a closing operation of the open / close switch in a strobe circuit disposed in the camera main body.
A discharge circuit having a resistor for discharging the electric charge stored in the main capacitor of the strobe circuit is connected in parallel with the main capacitor.

According to the third aspect of the present invention, there is provided a film-integrated camera in which a strobe is integrally provided in a camera body in which a roll film which has not been exposed is stored in advance. Trigger switch operating means for closing a trigger switch of the circuit with disassembly of the camera body is provided.

The switch actuating means according to the second and third aspects of the present invention may be a projection provided integrally with or separately from a front cover and a rear cover constituting the camera body, or a battery compartment cover for covering the battery compartment. . The switch actuating means may be a member separate from the substrate of the strobe circuit and may be a member capable of closing the open / close switch or the trigger switch when the camera body is disassembled. Is also good.

According to the second aspect of the present invention, when the camera body is disassembled, the open / close switch operating means closes the open / close switch of the discharge circuit, so that the electric charge stored in the capacitor flows to the discharge circuit and is discharged by the resistor. You. According to the third aspect of the present invention, when the trigger switch operating means closes the trigger switch by disassembling the camera body, the electric charge stored in the main capacitor flows through the strobe circuit and the strobe light emitting tube is turned on. Is discharged.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a flash circuit diagram used for a film-integrated camera, FIG. 2 is a perspective view of the film-integrated camera viewed from the front, FIG. FIG. 2 is a perspective view of the film-integrated camera as viewed from the back.

A film-integrated camera 1 according to a first embodiment shown in FIGS. 1 to 3 has a front cover 2 and a rear cover 3 made of synthetic resin.
At the right end of the upper surface of the camera body 4 configured by fitting
The camera body 4 is of a sealed type that cannot be disassembled without using a disassembly tool. In the film loading chamber in the camera body 4, an unphotographed roll film (both not shown) drawn out from the cartridge in the cartridge chamber is wound up. When the film is wound up and all shooting is completed, all of the roll film is housed in the cartridge.

The camera body 4 is provided with a photographing lens 6, a finder window 7 and a strobe switch activator 8 on the front, and the above-mentioned strobe light emitting section 5, shutter release button 9, film counter window 10 and charge confirmation on the top. Window 11
And a dial-type film winding knob 12 and a finder eyepiece window 13 are provided on the back.

A slit-shaped guide groove 14 is provided in a vertical direction on the upper right end of the front surface of the camera body 4 which is a lower part of the strobe light emitting section 5, and the above-mentioned strobe switch activator 8 is provided in the guide groove 14 in a vertical direction. When the strobe switch operator 8 is located at the upper end of the guide groove 14, the upper strobe light-emitting portion 5 jumps up in conjunction with the strobe switch operating member 8, and the strobe is activated.

An indicator lamp (not shown) is provided inside the charging confirmation window 11 to notify the completion of flash charging by flashing. The lighting of the flash emitting unit 5 and the flashing of the indicator lamp are controlled by the camera body 4. This is performed by a strobe circuit mounted on the device.

In the strobe circuit shown in FIG. 1, a power supply BT such as a dry battery built in the battery chamber is provided by a dashed line via one switch element SW1 (power switch) of a main switch MSW interlocked with a strobe switch operator 8. Is connected to the booster circuit VS surrounded by. The booster circuit VS is
An oscillation transformer TR having an oscillation transistor Q, a primary winding W1, a secondary winding W2, and a tertiary winding, ie, a feedback winding W3.
1 and a resistor R1, and oscillates with a DC current supplied from a power supply BT to convert the DC current into a high-voltage AC.

The booster circuit VS is connected to a main capacitor (electrolytic capacitor) MC via a diode D. The alternating current supplied from the booster circuit VS is rectified by the diode D and charged in the main capacitor MC. The cathode (-) and anode (+) of the main capacitor MC are connected to the cathode K and anode A of a strobe luminous tube (xenon tube) Xe so as to supply a discharge current to the strobe luminous tube Xe. .

A lighting circuit is connected to the grid G of the flash tube Xe. This lighting circuit includes a resistor R2, a trigger capacitor TC, a trigger switch TSW, and a trigger coil TR2 having a primary winding W11 and a primary winding W12, and a grid G of a strobe light emitting tube Xe and a main capacitor MC. The cathode (-) and the anode (+)
Resistance R2, trigger switch TSW and trigger coil TR
2 are connected. In this lighting circuit, when the trigger switch TSW is closed in conjunction with the shutter operation on the camera body side, the electric charge accumulated in the trigger capacitor TC flows through the primary winding W11 of the trigger coil TR2 as an instantaneous current. As a result, a pulse-like voltage generated in the secondary winding W12 is applied to the grating G of the flash tube Xe,
The flash tube Xe is turned on.

An alarm circuit AL is connected to the above-mentioned lighting circuit.
The completion of charging to C and a warning that the strobe switch operator 8 has been forgotten to be turned off are warned. This warning circuit AL
Is the interconnection point of the resistor R2 and the trigger switch TSW, and the other switch element SW2 of the main switch MSW.
Which has a series circuit of the resistor R3 and the neon tube Ne, a lighting circuit connected in parallel with the series circuit, and a trigger capacitor TC which is also used for the main switch MSW. When closed, it is connected between both ends of the main capacitor MC via the resistor R2, the neon tube Ne blinks, and a charge completion display and a warning are issued.

A discharge circuit SC having a discharge resistor R4 is connected to the cathode (-) and anode (+) of the main capacitor MC.
Are connected in parallel, and the main switch MSW is opened by operating the strobe switch operator 8 to OFF, or the camera body 4 is closed with the main switch MSW closed.
In the state where the strobe power supply BT is taken out, the electric charge of the main capacitor MC flows to the resistor R4 of the discharge circuit SC, and the electric charge is discharged. I have.

By using a resistor having a large resistance value as the resistor R4 of the discharge circuit SC, it is possible to discharge the main capacitor MC in a short time while minimizing battery consumption during use of the film-integrated camera 1. To do. Specifically, it is desirable to use a resistor having a resistance value at which discharge is completed in a range of about 3 hours to 24 hours for the resistor R4. If the discharge time is shorter than 3 hours, the current loss is increased, which is preferable. Absent. It is also possible to use a main capacitor MC having a large leakage current. In this case, the internal resistance of the main capacitor MC is equal to the resistance R of the discharge circuit SC.
This corresponds to 4.

The strobe light tube Xe and neon tube Ne in the strobe circuit correspond to the above-described strobe light emitting section 5 and indicator lamp, respectively.

Next, the operation of the electronic flash circuit according to the present embodiment will be described. First, when the strobe switch operator 8 is slid to the ON position, which is the upper end of the guide groove 14, the strobe light emitting unit 5 jumps up from the upper surface of the camera body 4, and at the same time, the main switch MSW closes,
The booster circuit VS is connected to the power supply BT via one switch element SW1 of the main switch MSW. As a result, the oscillation transistor Q operates and the oscillation transformer T
A current flows through the primary winding W1 of R1, and a high-voltage current further flows through the secondary winding W2. The high-voltage AC of the secondary winding W2 is rectified by the diode D and charged in the main capacitor MC.

The warning circuit AL includes a main switch M
SW is connected to the anode (+) of the main capacitor MC via the other switch element SW2 of the SW.
The same voltage as between the cathode (-) and anode (+) of C is applied to the resistor R2.
Is applied to both ends of the warning circuit AL.
Of the trigger capacitor TC is also started. Then, the charging voltage of the trigger capacitor TC is applied to the series circuit of the resistor R3 and the neon tube Ne, and the trigger capacitor TC is charged.
When the charging voltage of C reaches a predetermined voltage, the neon tube Ne starts discharging, that is, the neon tube Ne is turned on. At this time, the charging voltage of the main capacitor MC has reached a predetermined voltage required for strobe light emission.

The charging voltage of the trigger capacitor TC decreases due to the lighting of the neon tube Ne. When the charging voltage drops to some extent, the neon tube Ne stops discharging and goes out. As a result, the trigger capacitor TC is charged again, and when the charging voltage increases, the neon tube Ne is re-discharged and turned on.
The neon tube Ne repeats lighting and extinguishing in this way, and displays the completion of charging of the main capacitor MC by flashing light emission.

After the neon tube Ne blinks and emits light,
When the shutter release button 9 is pressed to operate the shutter, the trigger switch TSW is closed, and the electric charge of the main capacitor MC is discharged through the primary winding W11 of the trigger coil TR2, and the secondary winding W12 of the trigger coil TR2 is discharged.
, A high voltage is generated, the flash tube Xe is turned on, and flash photography is performed. After the flash photography is completed, the flash switch operator 8 is turned off and the main switch MSW is opened to stop the operation of the entire flash circuit including the warning circuit AL and stop the blinking of the indicator lamp.

In the film-integrated camera 1 constructed as described above, when the photographing of the film is completed, the exposed film is sent to a processing company such as a developing laboratory while the exposed film is stored in the camera body 4. The camera body 4 is disassembled into a front cover 2 and a rear cover 3, and the exposed film is taken out, and the power source BT of the strobe circuit is also taken out of the battery compartment of the camera body 4. The electric charge stored in the capacitor MC has already flowed to the discharge circuit SC by opening the main switch MSW, and has been discharged by the resistor R4.

Therefore, when the recycling body or the like disassembles the camera body 4, the electric charge accumulated in the main capacitor MC is discharged by opening the main switch MSW. Thus, even if a metal rod of a driver or the like touches the terminal of the main capacitor MC, it is possible to reliably prevent the generation of a shock noise.

Next, second and third embodiments of the present invention will be described with reference to FIGS.
A description will be given based on FIG. 4 to 6 show a second embodiment, FIG. 4 is a flash circuit diagram used for a film-integrated camera, FIG. 5 is a front view of a main part of a flash circuit substrate provided in the camera body, and FIG. FIG. 6 is a plan view of FIG. 7 to 10 show a third embodiment, FIG. 7 is a strobe circuit diagram, FIG. 8 is a front view of a film-integrated camera, FIG. 9 is a partially cutaway bottom view of FIG. 8, and FIG. FIG. 3 is a perspective view of a circuit open / close switch and a trigger switch operating means. In these second and third embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment shown in FIGS. 4 to 6, the strobe circuit of FIG. 4 has the same configuration as that of the first embodiment except for a discharge circuit SC for discharging. The cover 2 is provided with an open / close switch operating means 2a used in combination with the discharge circuit SC.

The discharge circuit SC is a series circuit of an open / close switch SW3 and a resistor R5, and is provided in parallel with the main capacitor MC with both ends connected to the cathode (-) and anode (+) of the main capacitor MC. Open / close switch SW3 has
A switch is used in which the contact S1 itself has a biasing force in the closing direction or a switch in which the contact S1 is constantly biased in the closing direction by a biasing means such as a coil spring. Is mounted together with the resistor R5.

The opening / closing switch operating means 2a includes a front cover 2
In the state where the front cover 2 and the rear cover 3 are fitted to each other and the roll film is accommodated in the camera body 4 by the protrusion integrally formed on the inner surface of the camera, the opening / closing switch operating means 2a connects the contact S1 of the opening / closing switch SW3. The discharge circuit SC is forcibly pushed to the open state, and the operation of the discharge circuit SC is stopped.

In this embodiment constructed as described above, when the front cover 2 and the strobe circuit board 20 are separated when the front cover 2 and the rear cover 3 of the camera body 4 are disassembled, the front cover 2 The integrated open / close switch operating means 2a is retracted from the open / close switch SW3 of the substrate 20, the contact S1 is closed, the discharge circuit SC operates, and the electric charge stored in the main capacitor MC is discharged by the resistor R5.

Next, a third embodiment of the present invention will be described with reference to FIGS.
Description will be made based on 0. The strobe circuit shown in FIG. 7 is such that once the main switch MSW is pressed, the main capacitor M
Oscillation continues until the charging of C reaches the voltage required for strobe photography, and the oscillation stops automatically when the voltage of the main capacitor MC reaches a predetermined value. A return-type switch 8 is used to automatically return from the ON position to the OFF position when the pressing operation is released.
For W, a normally open switch that maintains a normally open state is used.

When the main switch MSW is closed by depressing the strobe switch operator 8, a base current is supplied to the second transistor Q2 through the resistor R1, and an oscillating transistor which is a first transistor is supplied by the collector current of the transistor Q2. Q1 operates, and current flows through primary winding W1 of oscillation transformer TR1. Accordingly, a high-voltage current flows through the secondary winding W2 of the oscillation transformer TR1, is rectified by the diode D1, and is charged in the main capacitor MC.

When the current of the secondary winding W2 increases, the base current of the oscillation transistor Q1 also increases via the transistor Q2, and the collector current further increases.
The oscillation transistor Q1 enters an oscillation state, and the secondary winding W
Oscillation is continued by the back electromotive force of No. 2. Once oscillated, the oscillation of the oscillation transistor Q1 continues even when the main switch MSW is open, and the main capacitor MC is charged.

When the main capacitor MC is charged and the voltage of the neon tube Ne reaches a predetermined value, the neon tube Ne blinks and emits light. Furthermore, as the charging of the main capacitor MC progresses, the voltage across the resistor R3 increases, and when the voltage reaches a predetermined voltage, a Zener current flows through the Zener diode D2, and the third transistor Q3 as a third transistor
3, the base current of the transistor Q3 is turned on, and the transistor Q2 is turned off. As a result, the oscillation transistor Q1 is turned off to stop oscillation, and the current of the power supply BT is also cut.

When the oscillation of the oscillation transistor Q1 stops and the discharge of the main capacitor MC proceeds to lower the voltage,
The voltage of the neon tube Ne also drops, and the neon tube Ne goes out. If the neon tube Ne goes out during shooting, the main switch MSW is turned on by turning on the strobe switch operator 8.
Is closed and the strobe circuit operates again.

After the neon tube Ne flashes and emits light, when the shutter release button 9 is pressed to operate the shutter, the trigger switch TSW closes and the strobe light tube Xe turns on. Further, when the strobe light emitting tube Xe is turned on, a base current instantaneously flows through the oscillation transistor Q1 due to the voltage fluctuation of the circuit due to the emission current of the main capacitor MC, and the oscillation transistor Q1 re-oscillates. Thereby, recharging is performed without closing main switch MSW. Incidentally, the capacitor C in the strobe circuit of FIG.
Is provided to prevent careless re-oscillation of the oscillation transistor Q1 due to disturbance noise other than the emission current.

In the film-integrated camera 1 of this embodiment shown in FIGS. 8 to 10, a trigger switch TSW having a pair of long and short contacts S1 and S2 is provided to protrude from the substrate 20 of the strobe circuit to the side. This trigger switch TSW
The trigger switch actuating means 2b provided on the camera body 4
Are combined.

The trigger switch TSW has contacts S1, S
A normally-open switch, which is always separated and maintains an open state, is used. The trigger switch actuating means 2b is
The front cover 2 and the rear cover 3 are fitted by a rod-shaped protrusion having a shaft 2c protruding from the inner surface of the front cover 2 and a conical actuator 2d facing the tip of the shaft 2c. Camera body 4
In the state where the roll film is accommodated, the shaft portion 2c of the trigger switch operating means 2b is connected to the short contact S2 of the long contact S1.
The actuator 2 d at the end protrudes toward the rear cover 3.

In this embodiment constructed as described above, when the front cover 2 and the strobe circuit board 20 are separated when the front cover 2 and the rear cover 3 of the camera body 4 are disassembled, the trigger switch operating means 2b When the shaft 2c is set to the trigger switch T
The SW is pulled out in the axial direction along the long contact S1, and the conical surface of the actuator 2d pushes the tip of the long contact S1 in the direction of the short contact S2 to bring the long contact S1 into contact with the short contact S2. As a result, the trigger switch TSW is closed, and the electric charge stored in the main capacitor MC flows to the lighting circuit, and is discharged by lighting the strobe light emitting tube Xe. When the camera body 4 is disassembled, the power supply B for the strobe circuit
Since T is also extracted from the battery chamber 21, the main capacitor MC is not charged.

The opening / closing switch operating means of the second embodiment and the trigger switch operating means of the third embodiment are provided integrally with the front cover of the camera body to operate the opening / closing switch and the trigger switch of the discharge circuit. However, these switch actuation means are the front cover and rear cover of the camera body,
Alternatively, it can be provided integrally or separately with a battery chamber cover that covers the battery chamber. Furthermore, these switch actuation means
It is only necessary to enable the open / close switch and trigger switch of the discharge circuit to be operated as the camera body is disassembled, separate from the strobe circuit board.For example, if the strobe light emitting unit is separate from the strobe circuit board It can also be provided in this strobe light emitting section.

[0044]

The film-integrated camera according to the present invention is constructed as described above, and is stored in the main condenser at least when the main switch of the strobe circuit is opened or when the camera body is disassembled. The electric charge is discharged through the resistance of the discharge circuit and the lighting of the strobe light tube, so recycling companies and others who disassemble the camera body need to disassemble the camera body or remove the power supply by using metal such as a screwdriver. Even if the rod touches the terminal of the main condenser, it is possible to reliably prevent the generation of a shock noise.

[Brief description of the drawings]

FIG. 1 is a strobe circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a film-integrated camera showing a first embodiment of the present invention as viewed from the front.

FIG. 3 is a perspective view of a film-integrated camera according to a first embodiment of the present invention as viewed from the back.

FIG. 4 is a strobe circuit diagram showing a second embodiment of the present invention.

FIG. 5 is a front view of a main part of a camera body showing a second embodiment of the present invention.

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, showing a second embodiment of the present invention;

FIG. 7 is a strobe circuit diagram showing a third embodiment of the present invention.

FIG. 8 is a front view of a film-integrated camera showing a third embodiment of the present invention.

FIG. 9 is a partially cutaway bottom view of FIG. 8 showing a third embodiment of the present invention;

FIG. 10 is a perspective view of an open / close switch and a switch operating means of a discharge circuit showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Film integrated camera 2 ... Front cover 2a ... Open / close switch actuating means 2b ... Trigger switch actuating means 3 ... Rear cover 4 ... Camera body 5 ... Strobe light emitting unit 8 ... Strobe switch activator 9 ... Shutter release button 20 ... Strobe circuit AL: Warning circuit BT: Power supply such as dry battery D2: Zener diode MC: Main capacitor (electrolytic capacitor) MSW: Main switch Ne: Neon tube Q, Q1: Oscillation transistor Q3: Transistor with built-in resistor R1, R2, R3, R4 R5 Resistor SC Discharge circuit SW3 Open / close switch used for discharge circuit SC TC Trigger capacitor TSW Trigger switch TR1 Oscillation transformer TR2 Trigger coil VS Step-up circuit Xe Strobe light emitting tube (xenon tube)

Claims (3)

[Claims] 1. A film-integrated camera in which a strobe is integrated with a camera body in which an unexposed roll film is stored in advance. In a flash circuit provided in the camera body, the strobe is stored in a main capacitor of the strobe circuit. A film-integrated camera, characterized in that a discharge circuit having a resistor for discharging a charged electric charge is connected in parallel with a main capacitor. 2. A film-integrated camera in which a strobe is integrated with a camera body in which an unexposed roll film is stored in advance. The film-integrated camera is provided with an opening / closing switch operating means, and is disposed in the camera body. The strobe circuit includes an open / close switch that is closed by retreating the open / close switch operating means by disassembling the camera body, and a resistor that discharges the electric charge stored in the main capacitor of the strobe circuit by closing the open / close switch. A film-integrated camera in which a discharge circuit is connected in parallel with a main capacitor. 3. A film-integrated camera having a strobe integrated with a camera body in which an unexposed roll film has been stored in advance, wherein the film-integrated camera is provided with a strobe circuit trigger switch interlocked with a shutter operation. A film-integrated camera comprising a trigger switch actuating means that closes as the camera body is disassembled.