JP2000162680A - Stroboscopic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stroboscopic device capable of stopping flashing as necessary and preventing wasteful consumption of a battery due to forgetting to turn a switch off. SOLUTION: A main switch 35 for making an oscillation circuit 37 start the oscillation is set to have momentary functions. Then, a flashing stopping switch 34 having an alternative function is provided in a discharge loop for applying the charge of a trigger capacitor Ct to a trigger coil TR2, and further charging a main capacitor Cm is stopped by causing the oscillation of the circuit 37 to stop, when a fixed time elapsed, after starting the charging of the main capacitor Cm by a timer circuit 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strobe device, and more particularly to a strobe device integrally provided with a film unit with a lens which is pre-filled with a photographic film.

[0002]

2. Description of the Related Art An example of a strobe circuit constituting a strobe device in a conventional film unit with a lens is shown in FIG.
0 and its operation will be described.

In the strobe circuit shown in FIG.
Is a power source composed of, for example, an AA battery. When performing flash photography, when a slide-type double switch including a main switch 102 and a light emission stop switch 103 is turned on, the DC voltage from the power source 101 is reduced. The oscillation transistor 105 is supplied to the base of the oscillation transistor 105 via 104, and the oscillation transistor 105 is turned on and starts oscillating. As a result, a high AC voltage is induced in the secondary winding of the oscillation transformer 106.

[0004] The AC voltage output from the oscillation transformer 106 is rectified by the diode 107 and becomes a DC voltage to charge the main capacitor 108. The resistance 1
Through 09, the trigger capacitor 110 is also charged.

When the shutter release button of the film unit with a lens is pressed in a state where the main condenser 108 and the trigger condenser 110 are charged and the voltage reaches a predetermined value, the shutter blades are opened, and when the shutter is fully opened, the trigger switch 111 is opened. Turn on.

When the trigger switch 111 is turned on, the electric charge charged in the trigger capacitor 110 is supplied to the primary winding of the trigger coil 112, and a high voltage is induced in the secondary winding. A trigger electrode provided in contact with 113 is triggered.

As a result, the ionized xenon atoms in the flash tube 113 collide with the electrons ejected from the cathode and are excited, and the flash tube 113 emits light.

When the main switch 102 is turned off while the main capacitor 108 is being charged,
The oscillation operation of the oscillation transistor 105 stops.

Since the light emission stop switch 103 is also turned off at the same time, even if the shutter release button is pressed to turn on the trigger switch 111, the trigger condenser 110 is turned off.
, The strobe light emitting tube 113 does not emit light.

It has also been proposed to construct a strobe circuit using a one-push switch instead of the two slide switches.

In this flash circuit, as shown in FIG. 11, a timer circuit having a predetermined time constant is constituted by a resistor 201 and a capacitor 202. When the switch 203 is momentarily turned on, the capacitor 202 is discharged and the transistor 204 is discharged. When the base potential of the transistor 204 becomes a predetermined potential and the transistor 204 is turned on, the resistor 205, the transformer 206,
An oscillation circuit including the transistor 207 oscillates, and the DC voltage rectified by the diode 208
9, the main capacitor 209 is charged.

After a predetermined time determined by the time constant of the resistor 201 and the capacitor 202 has elapsed, the transistor 204 is turned off, and the oscillation of the transformer 206 and the transistor 207 is stopped. As a result, the main capacitor 209 and the trigger capacitor 210 are charged. Stopped.

When the trigger switch 211 is turned on in conjunction with the shutter release button, the charge stored in the trigger capacitor 210 is transferred to the trigger coil 212.
High voltage is induced in the secondary winding, and triggered by the high voltage, the strobe light emitting tube 21
3 emits light.

[0014]

However, the above-described strobe circuit using a slide switch allows a user to clearly select whether to use a strobe or not.
If the user forgets to turn off the switch, there is a problem that the battery is unnecessarily consumed.

Further, a flash circuit using a one-push type switch, once charged, even if the switch is erroneously pressed, always presses the shutter release button regardless of the user's will. There is a disadvantage that light emission occurs and light emission cannot be stopped.

Therefore, the present invention enables the user to clearly select whether or not to use the strobe, to stop the light emission if necessary, and to prevent unnecessary consumption of the battery due to forgetting to switch off. It is an object of the present invention to provide a strobe device that can prevent the strobe device.

[0017]

According to a first aspect of the present invention, there is provided a strobe luminous tube which is connected in parallel to the strobe luminous tube, and supplies energy for luminescence to the strobe luminous tube. A strobe device comprising: a main capacitor to be supplied; and an oscillation circuit for charging the main capacitor, wherein the first oscillation device is a return-type first device for connecting the oscillation circuit to a DC power supply and causing the oscillation circuit to start oscillation. A switch, a trigger capacitor for applying a high voltage for causing the strobe light emitting tube to emit light, and a trigger capacitor for applying a charge to the trigger coil, and a hold provided in a discharge loop for applying the charge of the trigger capacitor to the trigger coil. A second switch, and an oscillation stop circuit that causes the oscillation circuit to stop oscillation in accordance with the state of charge of the main capacitor. And wherein the door.

According to another aspect of the present invention, there is provided a strobe luminous tube, a main capacitor connected in parallel to the strobe luminous tube, and for supplying energy to the strobe luminous tube for light emission; A strobe device comprising: an oscillation circuit for charging a main capacitor, a first switch of a return type for connecting the oscillation circuit to a DC power supply and causing the oscillation circuit to start oscillating;
A trigger capacitor for applying a charge to a trigger coil for applying a high voltage for causing the flash tube to emit light, and a second holding type provided in a discharge loop for applying the charge of the trigger capacitor to the trigger coil. A switch, and an oscillation stop circuit that causes the oscillation circuit to stop oscillation in accordance with the state of charge of the main capacitor,
The first switch and the second switch are connected on one side.

According to a third aspect of the present invention, there is provided a strobe device according to the second aspect, wherein the first and second switches include a contact piece having a spring property,
A switch actuating the contact piece so as to make contact or non-contact with a corresponding portion on a wiring pattern by displacing while pressing on the contact piece, wherein the switch actuator is displaced by a predetermined amount. It is characterized in that it can be opened and closed individually by doing so.

According to a fourth aspect of the present invention, there is provided a strobe device according to the third aspect, wherein the contact piece is a single conductive member common to the first and second switches. A common contact, a first switch contact, and a second switch contact made of a conductive material and brought into a contact state or a non-contact state with respect to a corresponding portion on the wiring pattern, respectively. The first and second switches are configured such that the first or second switch contact is in a contact state or non-contact state with a corresponding portion on the wiring pattern as the switch operator slides on the contact piece. It is characterized by being opened and closed by being in a contact state.

According to a fifth aspect of the present invention, there is provided a strobe apparatus according to the fourth aspect, wherein a connection point between the first switch and the second switch is connected to the DC power supply. It is characterized by being provided on the negative electrode side.

According to a sixth aspect of the present invention, there is provided a strobe device according to the fourth aspect, wherein a connection point between the first switch and the second switch is connected to the DC power supply. It is characterized by being provided on the positive electrode side.

According to a seventh aspect of the present invention, there is provided a strobe device according to any one of the second to sixth aspects, wherein the oscillation stop circuit is configured to charge the main capacitor. When a predetermined time has elapsed after the start, the timer circuit stops the oscillation of the oscillation circuit and stops charging the main capacitor.

According to an eighth aspect of the present invention, there is provided a strobe device according to any one of the second to sixth aspects, wherein the oscillation stopping circuit is configured such that the main capacitor has a predetermined capacitance. The charging of the main capacitor is stopped when the charging voltage reaches

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 1 is a perspective view of a film unit with a lens according to Embodiment 1 of the present invention as viewed from the front, FIG. 2 is a perspective view of the film unit with a lens as viewed from the back, and FIG. 3 is a film unit with the lens. FIG. 4 is a cross-sectional view showing a configuration of a switch portion of a flash circuit constituting the flash device of FIG. 4, FIG. 4 is a perspective view showing an appearance of a contact piece of the switch portion, FIG. 5 is a circuit diagram of the flash circuit, FIG. FIG. 4 is an explanatory diagram for explaining an operation of the switch unit.

As shown in FIGS. 1 and 2, a film unit with a lens 10 according to the first embodiment includes a front cover 11 made of synthetic resin and a front cover 11 made of a synthetic resin. A camera body 13 is formed by covering the rear cover 12 with a strobe device having a fixed strobe light emitting unit 14 at the right end of the upper surface of the camera body 13. The uncovered roll film is loaded in advance, and the rear cover 1
2 has no back cover for attaching and detaching a film, and has a closed structure in which the front cover 11 and the rear cover 12 cannot be disassembled without using a disassembly tool.

The camera body 13 is provided with the above-described strobe light emitting section 14, photographing lens 16, finder window 17, and strobe switch section 18 on the front, and a shutter release button 19 and a film counter window 20 on the top. ing.

As shown in FIG. 2, a dial-type film winding knob 22 and a finder eyepiece window 23 are provided on the rear surface of the camera body 13, and are provided on an inner bottom of the camera body 13. A DC power supply BT using, for example, an AA-size dry battery is accommodated in the battery chamber.

The strobe switch section 18 is shown in FIGS.
As shown in FIG. 3, the contact piece 25 having a spring property and the contact piece 2
5 is a switch operator that slides while pressing on the contact 5 to bring the contact into a contact state or a non-contact state with a corresponding conductive band forming a wiring pattern on the circuit board 21.
6.

The contact piece 25 is formed by bending a long metal piece into a predetermined shape.
c, a common contact 27 electrically connected to and fixed to c, a trapezoidal ridge 28 formed on the distal end of the common contact 27, and a distal end of the trapezoidal ridge 28 formed with respect to the conductive band 21a. A light-emission stop switch contact (second switch contact) 29 that is in contact or non-contact, a pointed crest 30 formed on the tip side of the light-emission stop switch contact 29, and a pointed crest 30 And a main switch contact (first switch contact) 31 formed to be in contact with or non-contact with the conductive band 21b.

The switch operator 26 is a strobe light emitting unit 1
4 is a slide type that moves laterally in the guide groove 24 at the lower part of the switch 4. A protruding step 32 having a large length (along the moving direction of the actuator 26) and a protruding step 33 having a narrow width for pressing the peak-shaped ridge 30 are provided.

As the switch actuator 26 moves laterally, the projection 32 presses the trapezoidal ridge 28 of the contact piece, so that the light emission stop switch contact 29 comes into contact with the conductive band 21a and the light emission stop switch 34 is turned on. The state shifts from the off state to the on state, and this state is maintained.

Further, the convex step 33 presses the rear end side slope of the pointed peak 30 of the contact piece 25, so that the main switch contact 31 comes into contact with the conductive band 21b and the main switch 35 is momentarily turned. The state shifts from the off state to the on state, and the convex step 33 jumps over the top of the peak-shaped peak 30 and simultaneously returns to the off state (see FIG. 7).

That is, the strobe switch section 18 has an alternate function (holding type) having one of the contacts in common.
And a light emission stop switch (second switch) 34 for prohibiting light emission in the off state and a main switch (first switch) 35 having a momentary function (return type) are integrally formed by the simple configuration. It is formed in.

Here, the protruding step 33 is formed at a predetermined interval on the tip side of the protruding step 32, and the protruding steps 32, 33 each have a predetermined width and height (step). Are appropriately set in advance so that the function as the above-mentioned switch is reliably and smoothly performed.

The strobe light emitting section 14 accommodates a strobe light emitting tube (xenon tube) Xe. The lighting of the strobe light emitting tube Xe is performed by the operation of a strobe circuit 36 mounted in the camera body 13. Has become.

The strobe circuit 36, as shown in FIG.
A DC power supply BT, a strobe luminous tube Xe using a xenon lamp, a main capacitor Cm connected in parallel to the strobe luminous tube Xe and providing energy for light emission to the strobe luminous tube Xe, and a DC voltage from the DC power supply BT. An oscillating circuit 37 for boosting the voltage to a required high voltage and charging the main capacitor Cm; a diode D1 for rectifying the AC voltage output from the oscillating circuit 37;
When a predetermined time elapses after the start of charging of m, a high voltage is applied to a timer circuit (oscillation stop circuit) 38 for stopping the oscillation of the oscillation circuit 37 to stop charging the main capacitor Cm, and the trigger electrode G of the strobe light emitting tube Xe. Of the main capacitor Cm and an indicator light Ne composed of a neon lamp for informing the charging state of the main capacitor Cm.

The oscillation circuit 37 has an oscillation transformer TR1 having a primary winding W1 and a secondary winding W2, a collector connected to the primary winding W1 of the oscillation transformer TR1, and an emitter connected to the negative side of the power supply BT. It has a connected transistor Q1, a resistor R1 connected to the base of the transistor Q1, and a main switch 35 for starting oscillation.

The timer circuit 38 has a resistor R2 and a capacitor C1 for determining a predetermined time constant, and a transistor Q2 that switches according to the potential of the base thereof. The oscillation of the oscillation circuit 37 is started at the same time when the transistor Q2 is turned on. Then, the oscillation is stopped at the same time when the transistor Q2 is turned off.

That is, when the capacitor C1 is discharged immediately after the main switch 35 is turned on, the transistor Q2 is turned on when its base potential is substantially equal to the ground potential, and after a predetermined time elapses, the capacitor C1 is charged. When is completed, it is turned off.

The trigger circuit 39 includes a trigger coil TR2 for applying a high voltage to a trigger electrode G provided in contact with the strobe light emitting tube Xe to cause the strobe light emitting tube Xe to emit light,
Trigger capacitor C for applying charge to trigger coil TR2
t, a trigger switch 40 for connecting the trigger coil TR2 and the trigger capacitor Ct in conjunction with the shutter release button 19, and a light emission stop switch 34. By the trigger circuit 39, the charging voltage of the main capacitor Cm triggers the strobe light emitting tube Xe applied between the anode and the cathode to emit light.

Next, the operation will be described.

In the initial state, the capacitor C1 is charged by the DC power supply BT, and at this time, the transistor Q
2 is in the off state, so that the transistor Q1 has not started oscillating yet.

Here, from the position shown in FIG. 6A, the switch operator 26 is slid in the direction of arrow X in FIG. As the switch actuator 26 slides on the contact piece, first, as shown in FIG. 3B, the projection 32 presses the trapezoidal ridge 28 of the contact piece 25, thereby causing the light emission stop switch. The contact for use 29 comes into contact with the conductive band 21a, and the light emission stop switch 34 shifts from the off state to the on state and maintains this state.

Further, by moving the switch operator 26,
As shown in FIG. 3C, the protruding step 33 presses the rear end side slope of the pointed ridge 30 of the contact piece 25, so that the main switch contact 31 comes into contact with the conductive band 21b. The main switch 35 shifts from the off state to the on state, and as shown in FIG. 3D, the convex portion 33 jumps over the top of the peak 30 and returns to the off state at the same time.

In the above operation, when the main switch 35 is temporarily closed, the capacitor C1 is discharged, and the potential of the base of the transistor Q2 becomes substantially equal to the ground potential, so that the transistor Q2 is turned on. Then, a DC voltage from the DC power supply BT is supplied to the base of the transistor Q1 via the resistor R1. As a result, the transistor Q1 is turned on and starts oscillating.

By the oscillation operation of the transistor Q1,
An AC high voltage is induced in the secondary winding W2 of the oscillation transformer TR1. The high voltage of the secondary winding W2 is rectified by the diode D1 and becomes a DC voltage to charge the main capacitor Cm.

At this time, since the light emission stop switch 34 is maintained in the ON state, the main capacitor Cm is charged with the DC voltage and the trigger capacitor Ct is connected via the resistor R3 connected to the minus terminal of the main capacitor Cm.
Charging is also started.

When the charging of the capacitor Cm is completed after a lapse of a predetermined time, the base potential of the transistor Q2 drops and the transistor Q2 is turned off, and the transistor Q1 stops oscillating.
Charging is completed.

On the other hand, in a state where the main capacitor Cm and the trigger capacitor Ct are charged and the voltage reaches a predetermined value, the indicator lamp Ne is turned on to notify the completion of the charging.

In this state, the shutter release button 19
When the shutter is actuated by pressing, the trigger switch 40 is closed by the shutter blade, and the trigger capacitor Ct is released.
Trigger switch 40, primary winding W11 of trigger coil TR2, and light emission stop switch 34, and trigger capacitor Ct.
A discharge loop is formed for discharging the electric charge of the trigger coil TR2.
Flows as an instantaneous current through the primary winding W11.

By this instantaneous current, a pulse-like voltage generated in the secondary winding W12 is applied to a trigger electrode G provided in contact with the strobe light emitting tube Xe, and a high voltage from the main capacitor Cm is applied to the strobe light emitting tube Xe. When the voltage is applied, the flash tube Xe is turned on to emit light, and flash photography is performed.

Note that even after the charging of the main capacitor Cm and the trigger capacitor Ct is completed, the switch operator 26
Is returned to the position shown in FIG. 6A, the light emission stop switch 34 is turned off.
Does not operate, and even if the shutter release button 19 is pressed, the flash tube Xe does not emit light.

As described above, according to the first embodiment, the main switch 35 for causing the oscillation circuit 37 to start oscillating has a momentary function, and separately from this switch, the electric charge of the trigger capacitor Ct is set separately. Is provided in a discharge loop for applying the trigger coil TR2 to the trigger coil TR2. Further, a timer circuit 38 causes the oscillation circuit 37 to oscillate when a predetermined time has elapsed after the start of charging the main capacitor Cm. It is configured to stop and stop charging the main capacitor Cm, so that the user can use the strobe,
In addition to being able to clearly select non-use, even if the main capacitor Cm is charged, light emission can be stopped as required, and unnecessary consumption of the DC power supply BT due to forgetting to switch off can be prevented. it can.

The main switch 35 and the light emission stop switch 34 are connected on one side, and this connection point is provided on the negative side of the DC power supply BT.
Since the switch is a single metal piece common to the switches, cost can be reduced by simplification of the circuit and downsizing of the switch.

The main switch 35 and the light emission stop switch 34 are configured to be opened and closed by being displaced by a predetermined amount while the switch operator 26 presses on the contact piece 25 having a spring property. The operation is simple, and the circuit can be opened and closed reliably and smoothly.

Embodiment 2 FIG. 8 is a circuit diagram of a flash circuit constituting a flash device of a film unit with a lens according to a second embodiment of the present invention.

The second embodiment is different from the first embodiment in that a timer circuit is provided in the first embodiment to stop charging the main capacitor and the trigger capacitor when a predetermined time has elapsed after the start of charging. In contrast to this configuration, a voltage detection circuit is provided to stop charging the main capacitor and the trigger capacitor when the main capacitor reaches a predetermined charging voltage.

The other parts are substantially the same as those of the first embodiment, so that the description will be simplified.

The strobe circuit 36A according to the second embodiment includes:
As shown in FIG. 8, a DC power supply BT and a strobe light emitting tube X
e, main capacitor Cm, main capacitor Cm
Circuit 37A, a diode D1 for rectifying the AC voltage output from the oscillation circuit 37A, and a voltage of the main capacitor Cm. When the detected charging voltage reaches a predetermined voltage, Charge stop circuit (oscillation stop circuit) 38 for stopping charging of the capacitor Cm
A and a trigger circuit 39 for applying a high voltage to a trigger electrode of the strobe light emitting tube Xe.

The oscillation circuit 37A includes an oscillation transformer TR1
And a transistor Q3 having a collector connected to the primary winding W1 of the oscillation transformer TR1 and an emitter connected to the negative side of the DC power supply BT, and a collector connected to a positive side of the DC power supply BT, and an emitter connected to the base of the transistor Q3. And a transistor Q5 that performs a switching operation in accordance with a change in the base potential, a transistor Q5 having a base connected to the positive electrode of the DC power supply BT via a resistor R4, a collector connected to the base of the transistor Q4, and a resistor. It has a main switch 35 connected to R4 and the negative electrode of the DC power supply BT for starting oscillation.

The charge stop circuit 38A has a Zener diode D2 for detecting a voltage and a transistor Q6 that switches according to the potential of its base. When the transistor Q6 is turned on, the oscillation of the oscillation circuit 37A is stopped. Let it.

The trigger circuit 39 includes a trigger coil TR2
, A trigger capacitor Ct, a trigger switch 40,
And a light emission stop switch 34. By the trigger circuit 39, the charging voltage of the main capacitor Cm triggers the strobe light emitting tube Xe applied between the anode and the cathode to emit light.

Next, the operation will be described.

From the position shown in FIG. 6A, the switch operator 26 is slid in the direction of arrow X in FIG.

By this operation, first, the main switch 35 is temporarily closed, and the transistor Q5 is turned on, whereby the transistors Q4 and Q5 are also turned on, and the oscillation circuit 37A starts oscillating.

By the oscillating operation of the oscillating circuit 37A, a high AC voltage is induced in the secondary winding W2 of the oscillating transformer TR1. The high voltage of the secondary winding W2 is rectified by the diode D1 and becomes a DC voltage to charge the main capacitor Cm.

At this time, since the light emission stop switch 34 is maintained in the ON state, the main capacitor Cm is charged with the DC voltage, and the trigger capacitor Ct is connected via the resistor R3 connected to the minus terminal of the main capacitor Cm.
Charging is also started.

When the voltage of the main capacitor Cm reaches a predetermined value, the indicator light Ne lights up to notify the charge state of the main capacitor Cm, and further, the Zener diode D2 starts conducting, and a current is applied to the base of the transistor Q6. As a result, the transistor Q6 is turned on. by this,
The transistors Q4 and Q5 change to the off state, the oscillation circuit 37A stops oscillating, and charging is completed.

In this state, the shutter release button 19
When the trigger switch 40 is closed, the trigger capacitor Ct, the trigger switch 40 and the trigger coil TR2 are pressed.
A discharge loop for discharging the charge of the trigger capacitor Ct is formed by the primary winding W11 and the light emission stop switch 34, and the charge accumulated in the trigger capacitor Ct is instantaneously transferred to the primary winding W11 of the trigger coil TR2. It flows as an electric current.

A pulse voltage generated in the secondary winding W12 by this instantaneous current is applied to the trigger electrode G provided in contact with the strobe light emitting tube Xe, and the strobe light emitting tube Xe emits light.

As described above, according to the second embodiment, the charging stop circuit 38A is configured to stop charging the main capacitor Cm when the main capacitor Cm reaches a predetermined charging voltage. Therefore, more highly accurate charge control can be performed.

Embodiment 3 FIG. 9 is a circuit diagram of a strobe circuit constituting a strobe device of a film unit with a lens according to Embodiment 3 of the present invention.

The difference between the third embodiment and the second embodiment is that the common contact is provided on the negative electrode side of the power supply in the first embodiment, and the common contact is provided on the positive electrode side of the power supply. The point is that the discharge current of the trigger capacitor is made to flow through a power supply.

The other parts are substantially the same as those of the second embodiment, and the description thereof will be simplified.

The flash circuit 30B of the third embodiment is
As shown in FIG. 9, a DC power supply BT and a strobe light emitting tube X
e, main capacitor Cm, main capacitor Cm
Circuit 37B, a diode D1 for rectifying the AC voltage output from the oscillator circuit 37B, and a voltage of the main capacitor Cm. When the detected charging voltage reaches a predetermined voltage, Charge stop circuit (oscillation stop circuit) 38 for stopping charging of the capacitor Cm
B and a trigger circuit 39B for applying a high voltage to the trigger electrode G of the strobe light emitting tube Xe.

The oscillation circuit 37B includes an oscillation transformer TR1
And a transistor Q7 having a collector connected to the primary winding W1 of the oscillation transformer TR1, a base connected to the secondary winding W2, and an emitter connected to the negative side of the DC power supply BT, and a transistor Q7 connected to the positive side of the DC power supply BT. Connect the emitter and connect transistor Q
7, a transistor Q8 having a collector connected to the base via a coil L1 and a resistor R5, a diode D3 connected between the emitter and the base of the transistor Q8, and a diode D3 connected in parallel with the diode D3 to start oscillation. And a switch 35.

The charge stop circuit 38B has a Zener diode D4 for detecting a voltage, and a transistor Q9 that switches according to the potential of its base. When the transistor Q9 is turned on, the oscillation of the oscillation circuit 37B is stopped. Let it.

The trigger circuit 39B includes a trigger coil TR2
, A trigger capacitor Ct, a trigger switch 40,
And a light emission stop switch 34. By the trigger circuit 39, the charging voltage of the main capacitor Cm triggers the strobe light emitting tube Xe applied between the anode and the cathode to emit light.

Next, the operation will be described.

From the position shown in FIG. 6A, the switch operator 26 is slid in the direction of arrow X in FIG.

By this operation, first, the main switch 35 is temporarily closed, and the transistor Q8 is turned on, whereby the transistor Q7 is also turned on, and the oscillation circuit 37B starts oscillating.

By the oscillating operation of the oscillating circuit 37B, a high AC voltage is induced in the secondary winding W2 of the oscillating transformer TR1. The high voltage of the secondary winding W2 is rectified by the diode D1 and becomes a DC voltage to charge the main capacitor Cm.

At this time, since the light emission stop switch 34 is in the ON state, the main capacitor Cm is charged by the DC voltage, and the trigger capacitor Ct is connected to the negative terminal of the main capacitor Cm and the resistor R3 connected thereto. Charging is also started.

When the voltage of the main capacitor Cm reaches a predetermined value, the indicator light Ne lights up to notify the charge state of the main capacitor Cm, the Zener diode D4 starts conducting, and a current is applied to the base of the transistor Q9. As a result, the transistor Q9 is turned on. by this,
The transistor Q7 shifts to the off state, and the oscillation circuit 37B
Stops the oscillation and the charging is completed.

In this state, the shutter release button 19
When the trigger switch 40 is closed, the trigger capacitor Ct, the primary winding W11 of the trigger coil TR2, the trigger switch 40, the light emission stop switch 34, and the DC power supply BT
Thus, a discharge loop for discharging the charge of the trigger capacitor Ct is formed, and the charge stored in the trigger capacitor Ct flows through the primary winding W11 of the trigger coil TR2 as an instantaneous current.

A pulse voltage generated in the secondary winding W12 by this instantaneous current is applied to the trigger electrode G provided in contact with the flash tube Xe, and the flash tube Xe emits light.

In the third embodiment, the trigger capacitor Ct is discharged through the DC power supply BT.

As described above, according to the third embodiment, substantially the same effects as those of the second embodiment can be obtained.

Although the embodiment of the present invention has been described in detail, the specific configuration is not limited to this embodiment.

For example, in the above-described embodiment, the contact piece is common to the main switch 35 and the light emission stop switch 34, and is made of a single metal piece. Further, although the main switch 35 and the light emission stop switch 34 are connected on one side, they may be provided independently.

[0093]

As described above, according to the first aspect of the present invention, the first switch for causing the oscillation circuit to start oscillating is of the return type, and separately from this switch, the charge of the trigger capacitor is released. Since the holding type second switch is provided in the discharge loop for applying the voltage to the trigger coil, and the oscillation circuit is provided with an oscillation stop circuit for stopping the oscillation according to the state of charge of the main capacitor, the user can use the strobe. Can be clearly selected to use or not to use, even if the main capacitor is charged, the light emission can be stopped as needed, and the unnecessary power consumption of the DC power supply due to forgetting to turn off the switch can be prevented. Can be.

According to the second aspect of the present invention, the first
The second switch is connected to the second switch on one side, so that the cost can be reduced by simplifying the circuit and downsizing the switch.

According to the third aspect of the present invention, the first
And the second switch is configured to be opened and closed by being displaced by a predetermined amount while the switch operator presses on the contact piece having the spring property, so that the operation of the switch is simple, and the circuit is reliably and smoothly operated. Can be opened and closed.

According to the fourth aspect of the present invention, since the contact piece is made of a single conductive material common to the first and second switches, the size of the switch can be further reduced and the cost can be reduced. can do.

According to the fifth aspect of the present invention, the first
And the second switch are connected on one side,
Since this connection point is provided on the negative electrode side of the DC power supply, the cost can be reduced by simplifying the circuit and downsizing the switch.

According to the sixth aspect of the present invention, the first
And the second switch are connected on one side,
Since this connection point is provided on the positive electrode side of the DC power supply, the cost can be reduced by simplifying the circuit and downsizing the switch.

According to the invention described in claim 7, the oscillation stop circuit stops the oscillation of the oscillation circuit to stop the charging of the main capacitor when a predetermined time has elapsed after the start of charging of the main capacitor. With this configuration, unnecessary consumption of the DC power supply due to forgetting to turn off the switch can be reliably prevented.

According to the eighth aspect of the present invention, the oscillation stopping circuit is configured to stop charging the main capacitor when the main capacitor reaches a predetermined charging voltage, so that the accuracy is further improved. Charge control can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a film unit with a lens according to Embodiment 1 of the present invention as viewed from the front.

FIG. 2 is a perspective view of the film unit with the lens as viewed from the back.

FIG. 3 is a cross-sectional view showing a configuration of a switch section of a flash circuit constituting the flash device of the film unit with the lens.

FIG. 4 is a perspective view showing an appearance of a contact piece of the switch unit.

FIG. 5 is a circuit diagram of the strobe circuit.

FIG. 6 is an explanatory diagram for explaining an operation of the switch unit.

FIG. 7 is an explanatory diagram for explaining an operation of the switch unit.

FIG. 8 is a circuit diagram of a strobe circuit constituting a strobe device of a film unit with a lens according to Embodiment 2 of the present invention.

FIG. 9 is a circuit diagram of a strobe circuit constituting a strobe device of a film unit with a lens according to Embodiment 3 of the present invention.

FIG. 10 is a circuit diagram of a strobe circuit constituting a strobe device in a conventional film unit with a lens.

FIG. 11 is a circuit diagram of a flash circuit constituting a flash device in a conventional film unit with a lens.

[Explanation of symbols]

Reference Signs List 18 switch section 25 contact piece 26 switch operator 27 common contact 29 light emission stop switch contact (second switch contact) 31 main switch contact (first switch contact) 34 light emission stop switch (second switch) 35 Main switch (first switch) 36, 36A, 36B Strobe circuit 37, 37A, 37B Oscillator circuit 38 Timer circuit (oscillation stop circuit) 38A, 38B Charge stop circuit (oscillation stop circuit) 40 Trigger switch BT DC power supply Ct trigger Capacitor Cm Main capacitor G Trigger electrode Q Transistor TR2 Trigger coil Xe Strobe arc tube

Claims (8)

[Claims] 1. A strobe light comprising: a strobe light emitting tube; a main capacitor connected in parallel to the strobe light emitting tube to apply energy to the strobe light emitting tube for light emission; and an oscillation circuit for charging the main capacitor. An apparatus, comprising: a first switch of a return type for connecting the oscillation circuit to a DC power supply to start oscillation of the oscillation circuit; and a trigger coil for applying a high voltage for causing the flash tube to emit light. A trigger capacitor for applying a charge to the trigger coil; a second switch of a holding type provided in a discharge loop for applying a charge of the trigger capacitor to the trigger coil; A strobe device comprising a circuit and an oscillation stop circuit for stopping oscillation. 2. A strobe light comprising: a strobe light emitting tube; a main capacitor connected in parallel to the strobe light emitting tube to apply energy to the strobe light emitting tube for light emission; and an oscillation circuit for charging the main capacitor. An apparatus, comprising: a first switch of a return type for connecting the oscillation circuit to a DC power supply to start oscillation of the oscillation circuit; and a trigger coil for applying a high voltage for causing the flash tube to emit light. A trigger capacitor for applying a charge to the trigger coil; a second switch of a holding type provided in a discharge loop for applying a charge of the trigger capacitor to the trigger coil; The circuit includes an oscillation stop circuit for stopping oscillation, and the first switch and the second switch are connected on one side. Strobe apparatus characterized by being. 3. The first and second switches comprise a contact piece having a spring property, and a contact of the contact piece being displaced while pressing on the contact piece to a corresponding portion on a wiring pattern. The strobe device according to claim 2, further comprising: a switch operator in a contact state or a non-contact state, wherein the switch operator is opened and closed by being displaced by a predetermined amount. 4. The contact piece is made of a single conductive material common to the first and second switches, and is in a contact state or a non-contact state with respect to a corresponding portion on the wiring pattern, respectively. And a first switch contact and a second switch contact, wherein the first and second switches are arranged so that the switch actuator slides on the contact piece. 4. The flash device according to claim 3, wherein the first or second switch contact is opened or closed by being brought into a contact state or a non-contact state with a corresponding portion on the wiring pattern. 5. The strobe device according to claim 4, wherein a connection point between the first switch and the second switch is provided on a negative side of the DC power supply. 6. The strobe device according to claim 4, wherein a connection point between the first switch and the second switch is provided on a positive electrode side of the DC power supply. 7. The oscillation stop circuit comprises a timer circuit for stopping the oscillation of the oscillation circuit and stopping the charging of the main capacitor when a predetermined time has elapsed after the start of charging of the main capacitor. The strobe device according to any one of claims 2 to 6, wherein: 8. The method according to claim 2, wherein the oscillation stop circuit stops charging the main capacitor when the main capacitor reaches a predetermined charging voltage. A strobe device as described.