JPS59147331A - Power source device of strobe - Google Patents

Abstract

PURPOSE:To turn on selectively a flash bulb of a multiple-lamp strobe device by selecting and charging plural main capacitors simultaneously or individually. CONSTITUTION:When the switch SW3 of a charge selecting circuit CS1 is connected to a contact 1, the gate of the thyristor SCR2 of a charge selecting circuit CS2 is grounded through a resistance R13 and the thyristor SCR2 is cut off to select and charge only the main capacitor CM1 of the flash bulb FL1. Similarly, when the switch SW3 is connected to a contact 2, the main capacitor CM2 of a flash bulb FL2 is charged, and when the switch is connected to a contact 3, capacitors CM1 and CM2 are charged. Thus, the main capacitors are charged selectively to turn on the flash bulbs of the multiple-lamp strobe device selectively as desired.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device for a strobe, and more particularly to a power supply device for a strobe device having a plurality of main capacitors and a flash discharge tube.

Strobe devices having multiple flash discharge tubes and a main capacitor are well known in the art. In this kind of conventional strobe device, each flash circuit including a main capacitor and a flash discharge tube is connected in parallel, and the flash discharge tubes are caused to emit light at the same time or at different times.

Next, an example of the prior art will be explained with reference to FIG. 1. The electric circuit shown in FIG. 1 is the circuit of a conventional multi-flash flash device in which two flash discharge tubes are made to emit light at the same time. This device consists of a DC power supply E1 that has a plurality of dry batteries connected in series to obtain a power supply voltage specified in °C, a power switch SWl connected in series to the DC power supply EI, and a switch of the t-source switch SW1. A DC-1) C converter 1) CC0 which self-oscillates when the voltage is generated and boosts the low voltage of the DC power supply E1 to a high voltage, and a main capacitor CM1. CMt, and flash light emitting circuits FIC, , FIC, which operate with the main capacitors CM, CM, and CM as light emitting power sources, respectively. The above DC-DC converter I) CC,
is an external voltage transformer TI having a primary winding P and a secondary winding S, and this step-up transformer T, secondary winding, l, is
A PNP2J far-field transistor Q1 with one end connected to the base, a feedback transistor Q, a NPN main transistor Q whose collector is connected to the base through a resistor R, and the switch connected to the DC power source E1. SW
resistor lt2 and capacitor C, connected through I
8 in series and the secondary winding S of the step-up transformer T1.
The rectifying diode D1 has an anode connected to the other end. The base of the feedback transistor Q1 is connected to the connection point of the m resistance Rt and the capacitor co, and its emitter is connected to a common ground line 1 drawn out from the positive electrode of the DC power supply E1 via the electrolytic erosion switch SW1. It is connected to the main transistor Q! The emitter of is connected to the negative electrode of the DC power supply E. Furthermore, one end of the primary winding P of the upstream voltage boosting transformer T1 is connected to the upper common ground line -eo, and the other end is connected to the collector of the main transistor Q2.

And the operating voltage supply line eI drawn out from the cathode of the rectifying diode D and the common ground line! Between 0 and 0, the main condenser is 9CM.

CM is connected to the main capacitors CM and 0M2 through diodes D, , D, respectively, and flash light emitting circuits FIC and F'IC2 are further connected to the main capacitors CM and 0M2, respectively.The above flash light emitting circuit The FIC is for generating 7 lashes of light for photography and photography by discharging the charged charge of the main capacitor CM, which is charged to a high voltage by the output of the converter DCco, through the flash discharge tube FL. Trigger switch S
W2. Trigger capacitor CI + trigger transformer T2.
(flash discharge tube) L1, etc. νIJ, upper d1, both lines Takumi r-go. Between the resistor, the series circuit of neon 2 pump Ne1 for charging completed water entry, and the resistor it.
4. Diode D4. The series circuit of trigger switch SW2 and flash discharge tube FL1 are connected, respectively.
One end of the trigger capacitor c1 is connected to the connection point between the resistor R54 and the diode D4. The other end of the trigger capacitor C0 is connected to one end of the primary winding of the trigger transformer T. The other end of the primary winding of the trigger transformer T2 is connected to the line OaK, and also connected to one end of the secondary winding of the same transformer T2, and the other end of the winding is connected to the flash discharge tube PL. , the trigger electrode P"L
z a K connected.

Further, the other flash light emitting circuit FIC2 is configured in exactly the same manner as this one flash light emitting circuit FIC. That is, a resistor R5, a diode D6 . The series circuit of the trigger switch SW2 and the flash discharge tube PL are connected, respectively, and the diode D and the trigger switch SW! The trigger capacitor C2, the trigger transformer T, and the series circuit of the 01st winding are connected in parallel to both ends of the series circuit of the trigger transformer T,
One end of the secondary winding is the trigger electrode F of the flash discharge tube 1゛L.
The other end is connected to line 2°K to L2a.

The main capacitors CM and 0M2 connected to the output terminals of the converter DCC through diodes D, , D, respectively are the diodes D2. Once photoelectric charge is applied due to the presence of D, the photoelectric charge in main capacitor CM2 does not flow into one main capacitor CM, and the photoelectric charge in one main capacitor CM is transferred to the other main capacitor CM. , it does not flow into the walls. Therefore, flash discharge tube F
L represents only the main capacitor CM, and also the flash discharge tube FL.
, only the main capacitor CM2 emits light as a light source.

In the conventional multi-flash flash device configured as described above, when the electrolytic erosion switch SWI is closed, the DC-DC converter DCco oscillates and boosts the low voltage of the DC power source E1 to a specified high voltage. This boosted high voltage is rectified by the rectifying diode D and generated at the output terminal, and the dead capacitor CM.

The CMs are each photoelectrically charged by this high-voltage direct current. When the capacitors CM, CM2 or flash discharge tubes PL, PL, I"L2 are charged to a specified voltage sufficient to cause them to emit light, the neon lamp Nel lights up to indicate that charging is complete. .

Thereafter, when the trigger switch SW2 is closed at the same time as the shutter of the camera 2 is opened, the charges charged in the trigger capacitors C and C2 are released through the primary windings of the trigger transformers Tt and T, respectively. This causes high trigger voltages to be generated in the secondary windings of the transformer T2 and T2, respectively.

This trigger voltage is applied to the flash discharge tubes PL and nL.
, trigger electrodes FLta and FLza K are applied to the flash discharge tube PL, which becomes conductive, and FL2 to the main capacitor CM, and CM! What is the charge charge? 1
1, flash discharge tube FL, and FL! emits discharge light at the same time.

The above is the configuration and operation of the conventional multi-flash flash device.

By the way, as can be clearly seen from this conventional example,
In conventional multi-flash flash devices, most of the metal flash discharge tubes are made to emit light at the same time, or they are made to emit light sequentially with a slight temporal shift, and the flash discharge tubes are selectively emitted. There is no consideration given to making it happen.

In flash photography using a multi-flash strobe device, if you want only one of the two flash discharge tubes to emit a flash, or if you have two or more multiple flash devices, the total There are many cases where you want to select some of them and make them emit flash light. However, in order to do this, the charging voltage to the main capacitor is high, and the photoelectric current is a large current, so we have to make some improvements in terms of power consumption and voltage resistance. .

In view of the above points, an object of the present invention is to provide a dry battery and a DC-DC
By making it possible to selectively feed power to several main capacitors from the %L song consisting of a converter, it is also possible to cause only the desired flash emitting VL tube to emit light. To provide strobe power supply.

According to the present invention, in a multi-flash flash device, not only can all the flash discharge tubes emit light at the same time, but also it is possible to select any one of the plurality of flash discharge tubes and cause only that flash discharge tube to emit light. The scope of use of the conventional multi-flash flash device can be expanded, and flash photography with a desired light meter can be easily performed.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 2 shows a strobe light d7I showing an embodiment of the present invention.
FIG. 2 is a ``drowsiness'' diagram of the device. The power supply device according to the present invention is constructed by adding a charging selection circuit to the conventional power supply device. In the embodiment shown in FIG. 2, this charge selection means is comprised of charge selection circuits C8, C82.

For convenience of explanation, a case will be described in which the charging selection circuits cs, , cs, as shown in FIG. 2 are added to the conventional power supply device shown in FIG. 1.

Therefore, in FIG. 2, the same reference numerals are given to the parts that are configured in exactly the same way as in FIG.

The charging selection circuits C8, , C8, are connected to the output terminal of the DC-DC converter DCC0, and are thyristors SC, , , which perform on-off control of the light VjL t K to the main capacitors CM, , CM, respectively. It mainly consists of an SC power supply and a changeover switch SW for selecting the photoelectric power to the main capacitors CM, CM, and CM.

The charging selection circuit C8I for selecting one of the main capacitors CM is connected to a DC-DC connector (DCco
The operating voltage supply line 21 between the cathode of the rectifier diode D1 and the anode of the front diode D2, which is the output end of the rectifier diode D1, and the common ground line type.

is added as follows: That is, the on-off control thyristor SCR has its anode connected to the cathode of the rectifying diode D, and its cathode connected to the anode of the diode D.
Its gate is connected to the second switching terminal 2 of the upward self-selection switch SW8 via a resistor R3. In addition, a resistor 1 (7) is connected between the gate and cathode of the thyristor SCR, and an ignition circuit consisting of a parallel circuit of a resistor L6 and a capacitor C8 is connected between the gate and anode of the thyristor 5cit. One end of the resistor R8 for discharging the capacitor C1 is connected to the resistor R8, and the other end of the resistor R8 is connected to the resistor R4.
The anode of the diode D60 is connected to the cathode of the trigger capacitor itself.

Further, the charging selection circuit C82 for selecting the other main capacitor CM is also connected to the DC-DC connector (-ta D).
The output terminal of Cco is connected to an operating voltage supply line between the cathode of the fluorescent diode D and the anode of the diode D, and to a common ground line, eo. That is, the thyristor S for on-off control
CR2 connects the 7th node with a rectifying diode D,
and its cathode is connected to the anode of the upper hpi diode D, and its gate is connected to the first switching terminal 1 of the selection changeover switch SW through a resistor RI. . Also, thyristor 5C
A resistor R81 is connected between the gate and cathode of R2, and further between the gate and anode of thyristor 5Ca2,
An ignition circuit consisting of a parallel circuit of a resistor R1o and a capacitor C4 is connected. Also, one end of the resistor R1□ for discharging the trigger capacitor C2 is connected to the gate, and the other end of the resistor R1□ is a diode D7 whose anode is connected to the connection point between the resistor R5 and the trigger capacitor C3.
The cathode of is ahed.

As described above, the charging selection circuits Os, , C8, are added.

In the power supply device of the present embodiment configured in this way, when the double capacitors CM, , CM are simultaneously charged and the double-opening discharge tubes FL, , F'L are caused to emit flash light at the same time, the power supply device shown in the figure is used. The selection switch SW may be switched to the idle terminal of the sixth switching terminal 3 as shown in FIG. When the switching movable contact piece of the changeover switch SW is switched to the third changeover terminal 6, the switch SW.

The second and first switching terminals 2.1 of are respectively opened. Therefore, when the power switch SW is closed in this state, the DC-DC converter DCC0 oscillates and boosts the voltage, and the high voltage is rectified and the diode D,
is output from the cathode to the operating voltage supply line -el. Then, this output voltage is applied to the ignition circuit of resistor R6, capacitor C8, and resistor R1,o.

Since the voltage is applied to each gate of the thyristors SCR, 5CI (, , , , ) through the ignition circuit of the capacitor C4, both thyristors SCI, 5CI (, .

Diode Dt is connected from the operating voltage supply line which is the output terminal of
, D, through which the charging current flows through the main capacitor CM,.

CM, respectively, flow into the amphibious capacitor CM,.

CM, is charged in the specified value case. After photoelectricity is completed, as mentioned above, switch the trigger switch SW! is closed in conjunction with the opening of the camera shutter, thereby operating the trigger circuit and causing both open discharge tubes FL, PL to emit light at the same time.

Next, if you want to make only the flash discharge tube PL emit light,
The switching movable contact piece of the selection switch SW island may be switched to the second switching terminal 2. Then, the same switch SW,
The first and third switching terminals 1 and 3 of are opened, and
When the second switching terminal 2 of the switch SWs is connected to ground, the gate of the thyristor SCR is connected to the resistor R and grounded, so that the thyristor 80R
1 cannot conduct and is in a cutoff state. Therefore, when the power switch SW is closed in this state, the DC
-DC converter I) The high voltage output of CCo is resistor R1
8. Thyristor 80 through the ignition circuit of capacitor C4
R.

The voltage is applied only to the gate of SIRISK 8CR, , and only SIRISK 8CR, , is conductive. Therefore, the main capacitor CM! Charging is performed only when In addition, the above-mentioned changeover switch SW.

By switching connection to terminal 2 of thyristor 80R.

At the same time, the power supply to the main capacitor CM1 is cut off, and at the same time, one flashlight emitting circuit Ii' I C
.

Since the trigger capacitor C1 is connected to the ground via the diode D and the resistor R8, the potential of the trigger capacitor C8 also drops, making it impossible to trigger the flash discharge tube FL.

In this way, only the main capacitor CM is charged to the specified value, so the trigger switch fsW is activated.

When the flash discharge tube FLt is closed, only the flash discharge tube FLt emits light.

Note that diodes D4.D are inserted in each trigger circuit of the flash light emitting circuits PIC, , E"IC, respectively.

When one of the trigger circuits is disabled,
This is inserted to prevent the charge on the other trigger capacitor from escaping to ground through one disabled trigger circuit.

Also, contrary to the above case, the flash discharge tube FL! If it is desired to cause only the flash discharge tube PL to emit light without causing it to emit light, it is sufficient to switch the selection changeover switch SW to the first changeover terminal 1. Then, the second and sixth switches of the same switch SWa
The switching terminals 2 and 6 are opened, and the Cyrisk SCR is in the cut-off state and no longer conductive.As can be easily inferred from the above explanation of the operation, only one main capacitor CM is supplied with power, and the other is main capacitor C
The power supply to M is cut off. Therefore, the trigger switch Sw
, is closed, only the flash discharge tube 11i'L emits light.

As described above, according to the present invention, in a multi-flash flash device ≦
Optionally, all flash discharge tubes can be made to emit light at the same time, or a desired flash discharge tube can be selected from the housing and only that flash discharge tube can be made to emit light.

FIG. 6 is a specific electrical circuit diagram in which the present invention is applied to an auto strobe, that is, a multi-flash strobe device having an automatic flash stop function.

This multi-flash strobe device includes a first flash discharge tube FL. A first light emission control circuit system A for making the light emit light, a second light emission control circuit system B for making the second flash discharge tube P L,o emit light, and four AA nickel cadmium batteries are connected in series. The power supply circuit system C includes a DC power supply E1 connected to the DC power supply E1 and a DC-DC converter DCC for boosting the voltage.

The first light emission control circuit system A includes a photometry circuit PMC surrounded by a point +viID and a first light emission control circuit F surrounded by a dotted line E.
I.C. It is formed by. Above i++++9 circuit P
MC denotes the first light emission control circuit FIC,o and a second light emission control N path FIC, which will be described later. In order to perform the auto strobe function, the reflected light from the subject is side-lit, and the photometric output is sent to the second flash through the first flash control circuit I' IC,o and the selection circuit BLE (described later). Control circuit F
This circuit is manually operated for IC and o, and is configured to include a known light receiving circuit and an integrating circuit shown in the blocks of the side light receiving element 1)T and point iD. Further, a strobe light emission mode changeover switch SW4° is provided within the photometry circuit PMC. This light emitting mode selector switch 5W4o can be switched to five switching terminals 41 to 45, the switching terminal 41 is for full light emission in manual mode, and the switching terminal 42 is for full light emission in manual mode with 4 light gongs. , terminals 43 to 45 are auto mode switching terminals, terminal 46 corresponds to setting the calibration value to 4, terminal 44 corresponds to setting the calibration value to 5.6, and terminal 45 corresponds to setting the calibration value to 8. By switching the terminal, the light emitting lid is automatically and appropriately controlled in this auto mode.

the first light emission control circuit PIC; Ha, point &! As shown in block E, the first flash discharge tube PL is configured to include a dimming N path and a trigger circuit, etc., which operate in response to the output from the photometry circuit PMC.

The light emitting operation is controlled in a timely manner.

Note that the first light emission control circuit system A includes an upper self-photometering circuit PMC, the first light emission control N path F'IC,o, and a second light emission control circuit system B as described below. the light emitting system selection switching circuit ESW, and the above selection circuit ELE.

the second light emission control circuit FIC; , a DC power supply E constituting the power supply circuit C, a DC-DC converter DCC,.

, and the detailed explanation of each structure and operation of the display N-way DSC, each of which is well known, will be omitted in order to prevent the explanation from becoming unnecessarily long, and only the characteristic parts thereof will be described. I will briefly describe this.

The second light emission control circuit system B includes a light emitting yarn selection switching circuit ESW surrounded by a dotted line F and a selection circuit ELE surrounded by a dotted line G.
and a second light emission control circuit F L Coo surrounded by a dotted line H.

The light emitting thread selection switching circuit E8W selects whether to operate the first light emission control circuit system A and the second light emission control circuit system B at the same time, or to operate only one of them. It is composed of a selection changeover circuit including a changeover switch SW3°, and a manual time signal generation circuit that sets the manual time signal in the manual mode. Upper self-selection switch SW. is formed of a switch that selectively switches one movable contact piece to the four switching terminals 61 to 34, and when the movable contact piece is switched to the terminal 61, both the first and second light emission control circuit threads are switched. When A and B operate at the same time and switch to terminal 32,
The charge selection means of the present invention is configured such that only the first light emission control circuit system A operates and when the movable contact is switched to the terminal 63, only the second light emission control circuit system B operates. It's about to be controlled. Further, the movable contact piece is switched to the switching terminal 34 when a zoom lens is attached to the camera, and in this case both light emission control circuit systems A and B are operated.

The above manual time signal generation circuit includes a large number of resistors t,
. A light amount changeover switch 5w1io and this switch SW. The capacitor C6 is connected in series with the switched resistor R6o to form a time constant circuit, and a desired manual time signal can be manually set in the lanyard mode. It is something that will be done.

Further, the selection circuit ELE transmits the manual time signal set in the manual time signal generation circuit to the second light emission control circuit FIc2o, but transmits the music j light output signal in the side light circuit PMC to the second light emission. It is for selecting whether to transmit the signal to the control circuit FIC2°, and the above selection is made by an external switch (not shown). Then, when the auto selection is made, the second light emission control circuit F'IC of the manual time signal. The side light output signal from the photometric circuit PMC is transmitted to the second light emission control circuit FIC2o.
The amount of light emitted by the flash discharge tube P L,o is automatically and appropriately controlled in the same way as the first flash discharge tube F Llo . In addition, when manual selection is made, the second light emission control circuit Ii'I of the photometry output signal from the photometry circuit PMC is
C! .

The manual time signal set in the manual time signal generation circuit is transmitted to the second light emission 1BIJ.
is transmitted to the control circuit F I C,o, and the second flash discharge tube P
L. The light emission is controlled at the time set in the manual above.

The above second light emission control (b) path FIC! As shown in the block at point fIMH, ◎ is configured to include a dimming circuit, a trigger circuit, etc. that operate in response to the output signal from the selected N path ELE, and the second flash discharge tube FL2.
The light emitting operation is controlled in a timely manner.

Furthermore, the main transistor Q2 for oscillation is different from the power supply circuit in the embodiment shown in FIG.
The only difference is that it is composed of two transistors Q2a and Q2b and that a current superimposition capacitor 〇 is added, and its operation remains the same. In addition, the power switches 5W1a and 5W1b are formed by interlocking changeover switches, and the movable contact terminal C is connected to the common ground line e.

One switching terminal a serves as a power supply connection terminal. Therefore, when the movable contact piece is switched to this switching terminal a, the power is turned on. Further, the other switching terminal is connected to a charging selection circuit C which is charging selection means according to the present invention.
This is a terminal that connects each gate of the thyristor 1SCR, , SCR, in 8, , C8, to the ground.

It is considered that by grounding the gate of 5CJt, the charging selection circuits cs, , cs are also rendered inactive.

In FIG. 3, the symbol O8T indicates an external power supply connection terminal, and the symbols CC8 and CCT indicate a leg S contact and a connector for connecting the camera, respectively.

The multi-flash strobe device i in FIG. 3 configured in this way
In this case, the charging selection means according to the present invention is applied as follows. That is, the charge selection means is the charge selection circuit C8 described in the embodiment of FIG.

C8, and one charging selection circuit C81 includes a main capacitor CM serving as a light emitting power source for the first flash discharge tube FL,o, and a DC-1,)C converter DCC. , o, and the other light '
The output selection circuit C8 is connected as shown in the figure between the main capacitor CM, which serves as a light emitting power source for the second flash discharge tube F L12, and the output terminal of the DC-DC converter D CC,o. be given In this case, the difference from the second embodiment is that the resistor R connected at one end to the gel of the thyristor SCR of the -power charging selection circuit C8.
, is a resistor whose other end is connected to the switching terminal 63 of the selection changeover switch SW3° in the light emitting system selection changeover circuit ESW, and whose one end is connected to the gate of the thyristor 5 (Jt2) of the other charge selection circuit C8. R□3 is different only in that the other end is connected to the switching terminal 32 of the selection changeover switch 5W3o.

However, when the selection changeover switch SW3° is switched to the terminal 62, the operation is the same as that of the thyristor SCR.

Since the gate of the first flash discharge tube FLl is grounded, only one main capacitor CM is charged, and the first flash discharge tube FLl is charged.
o can emit light, and the switch SW,.

When is switched to terminal 33, the gate of thyristor 5CI (,,) is grounded, so only the other main capacitor CM is charged, and the second flash discharge tube E'L!o is charged.
This is exactly the same as the embodiment shown in FIG. 2 above.

In this electric circuit, the output diode D2. of the power supply circuit. l) Output diodes D2a, D2b and RI,a each having two connected in series.

D and b are formed, but the required number of these are connected depending on the relationship of withstand voltage. For example, if a diode with a withstand voltage of 1500 V is used, the voltage required by the circuit is 250 V.
If it is 0 V, make two flights, 3000 V) 2500
Make it V. Of course, if one beam can cover the entire amount of light, one beam is sufficient.

As described above, the present invention can be easily added to a multi-flash flash device having a plurality of flash discharge tubes and having automatic and manual light emission functions.

As described above, the present invention can provide a strobe power supply device that can expand the scope of use of the conventional multi-flash strobe device, as described at the beginning of the specification.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing an example of a conventional strobe device, and FIG. 2 is an electric circuit diagram of a strobe power supply device according to an embodiment of the present invention.

Claims (1)

[Scope of Claims] A power supply device for a strobe having a plurality of main capacitors and flash discharge tubes, characterized in that the power supply device is provided with charging selection means for charging each of the main capacitors simultaneously or individually.