CA1164521A - Power supply arrangement for an optical apparatus - Google Patents
Power supply arrangement for an optical apparatusInfo
- Publication number
- CA1164521A CA1164521A CA000323321A CA323321A CA1164521A CA 1164521 A CA1164521 A CA 1164521A CA 000323321 A CA000323321 A CA 000323321A CA 323321 A CA323321 A CA 323321A CA 1164521 A CA1164521 A CA 1164521A
- Authority
- CA
- Canada
- Prior art keywords
- circuit
- power supply
- supply arrangement
- direct current
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
- H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
- H02M3/3385—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement with automatic control of output voltage or current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stroboscope Apparatuses (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
Abstract of the Disclosure The invention relates to a power supply arrangement for an optical apparatus for driving a plurality of load equipments. The arrangement includes a direct current power source circuit, a voltage converter circuit, which includes an oscillator circuit, and a rectifier circuit. The arrange-ment further includes a charging circuit for storing electrical energy and supplying the electrical energy to a first load circuit, and a trigger signal generator circuit for trigger-ing the first load circuit. A second load circuit is activ-ated by the direct current power source circuit, and an oscill-ation control circuit is provided for controlling the voltage converter circuit so that the activation of the voltage conver-ter circuit is stopped after the first load circuit is actuated.
The actuation is started after electric power is supplied to the second load circuit.
The actuation is started after electric power is supplied to the second load circuit.
Description
I lB4~2}
FIELD OF THE I~ NTION
The present invention relate~ to a power ~upply arrangement for an optical apparatus, and more particularly;
to a power supply arrangement for use a plurality of load to be supplied the electrical energy.
BACKGROUND OF THE INVENTION
In recent years, the flash apparatus has ~een widely employed in various kinds of optical apparatus which require a flash of light. Particularly, in the art of phot-ography, artificial light is used to illuminate an object tobe photographed. One form of artificial light which is now widely used is so-called electric flash device~ It is common practice in electric flash devices to obtain high intensity illumination for photographic purposes by dis-charging a charged capacitor through a gas-filled flash tube.
A low voltage D.C. power source IS generally employed together with suitable circuitry in order to obtain the relatively high D.C. voltage which is needed to charge the flash capac-itor for firing the flash tube. Since an electric flash device o~ thi~ type iB generally portable, a battery operated power supply is usually employed as a power source of the electric flash device.
In the battery operated power supply, a D.C. - D.C.
convexter i~, generally, employed in order to regulate a voltage from a battery. High D.C. voltage is obtained from the battery through the use of a voltage converter. A con-verter inclllde3 a transformer for converting low D.C. voltage to high A~C~ voltage, and a rectifier circuit for rectifying the A.C. voltage, the rectified voltage being then applied to a fla~h capacitor in order to charge it. The power ~upply of this kind of the load employs a D.C. - D.C.
~A~
~ 164~
converter which comprises a direct current power ~ource circuit havin~ a battery, a voltaye converter circuit for converting a direct current output voltage to an alternatirly current voltaye, a rectifier circuit for rectifying the alternating current voltage in-to a direct current voltage.
Electric flash un:its employ a power supply usual:Ly wherein a large output capacitor is charged, over a period of time, to a voltage of sufficient amplitude to supply a photo-flash lamp. These power supplies usually employ a mechanical vibrator for the purpose of converting a relatively low battery volta~e to the relatively high unidirectional voltage required for a load such as, for example, the photoflash lamp.
It can readily be understood that under ordinary circumstances when an electric flash device is being used, a substantial portion of the time during which the device is turned on may be standby time, that is, time which elapses after the power supply has charged the capacitor to a suitable value and before the carnera shutter is tripped thereby discharging the capacitor through the flash tube. During this time the power supply consumes energy from the battery without producing any useful result. The energy loss may be significant, par-ticularly when the device includes a transformer. As the batteries age their output voltage drops and a longer period of time is required for firing the flash tube. In addition, the device becomes incapable of flashing the flash tube.
Particularly when the electric flash device is used;
in the camera equipping other load equipment such as, for exarnple a data recorder or a motor driving device, it is necess~ry to use a power supply in common with the electric flash unit and the other :Load equipment. In this case, the data recorder or the motor driving device must be driven " - 2--~ . ~ ? ' ' . . . .
FIELD OF THE I~ NTION
The present invention relate~ to a power ~upply arrangement for an optical apparatus, and more particularly;
to a power supply arrangement for use a plurality of load to be supplied the electrical energy.
BACKGROUND OF THE INVENTION
In recent years, the flash apparatus has ~een widely employed in various kinds of optical apparatus which require a flash of light. Particularly, in the art of phot-ography, artificial light is used to illuminate an object tobe photographed. One form of artificial light which is now widely used is so-called electric flash device~ It is common practice in electric flash devices to obtain high intensity illumination for photographic purposes by dis-charging a charged capacitor through a gas-filled flash tube.
A low voltage D.C. power source IS generally employed together with suitable circuitry in order to obtain the relatively high D.C. voltage which is needed to charge the flash capac-itor for firing the flash tube. Since an electric flash device o~ thi~ type iB generally portable, a battery operated power supply is usually employed as a power source of the electric flash device.
In the battery operated power supply, a D.C. - D.C.
convexter i~, generally, employed in order to regulate a voltage from a battery. High D.C. voltage is obtained from the battery through the use of a voltage converter. A con-verter inclllde3 a transformer for converting low D.C. voltage to high A~C~ voltage, and a rectifier circuit for rectifying the A.C. voltage, the rectified voltage being then applied to a fla~h capacitor in order to charge it. The power ~upply of this kind of the load employs a D.C. - D.C.
~A~
~ 164~
converter which comprises a direct current power ~ource circuit havin~ a battery, a voltaye converter circuit for converting a direct current output voltage to an alternatirly current voltaye, a rectifier circuit for rectifying the alternating current voltage in-to a direct current voltage.
Electric flash un:its employ a power supply usual:Ly wherein a large output capacitor is charged, over a period of time, to a voltage of sufficient amplitude to supply a photo-flash lamp. These power supplies usually employ a mechanical vibrator for the purpose of converting a relatively low battery volta~e to the relatively high unidirectional voltage required for a load such as, for example, the photoflash lamp.
It can readily be understood that under ordinary circumstances when an electric flash device is being used, a substantial portion of the time during which the device is turned on may be standby time, that is, time which elapses after the power supply has charged the capacitor to a suitable value and before the carnera shutter is tripped thereby discharging the capacitor through the flash tube. During this time the power supply consumes energy from the battery without producing any useful result. The energy loss may be significant, par-ticularly when the device includes a transformer. As the batteries age their output voltage drops and a longer period of time is required for firing the flash tube. In addition, the device becomes incapable of flashing the flash tube.
Particularly when the electric flash device is used;
in the camera equipping other load equipment such as, for exarnple a data recorder or a motor driving device, it is necess~ry to use a power supply in common with the electric flash unit and the other :Load equipment. In this case, the data recorder or the motor driving device must be driven " - 2--~ . ~ ? ' ' . . . .
2 ~
by an identical power supply, immedia-tely after the flash tube generates the flash liyht. It is difficult to drive both the flash tube and the data recorder device or the rnotor driving device, because of the large arnount of power required to opera-te the fLash tube~ Accordingly, it is neees,sary to cause the power supply for flash tube to its OFF state during the activation of the data recording device or the motor driving device and to make the charging time of a charging circuit of the flash device short, in order to smookhly perforrn the activa-tion of the flash device and other load equipment.
OBJECT OF THE INVENTION
The prir~ry objeet of the invention is to provide a power supply arrangement for an optical apparatus which can effeetively operate a plurality of load equipment by eontrol-ling the O~-OFF timing automatically.
Another objeet of the present invention is to pro-vide an economieal and high performance power supply arrange-ment whieh eonsumes a small amount of electrieal energy to supply to a load circuit, by interrupting the current to be supplied to one load equipment during the time in which the other load equipment is actuated, and which is e,asy to operate as well as being convenient to use.
SUMMARY OF '~E INVENTIO~
In accordance with a particular embodiment of the invention there is provided a power supply arrangement Eor a flash device. The arrangement includes a direct current power souree, a converter for converting a direct current voltage froTn the direct current po~Jer source to an alternat-ing current voltage. A rectifier rectifies the alternatingcurrent voltage and a main capacitor is arranged to be charged ,, 5 2 ~
by way of a rectifier. A first load includes a flash tube and a trigger signal generator is provided for inltiating the discharye of the main capacitor into the firs-t load. A
second load is connected to the current power source, and a control circuik, including a con-trol switching element, is connected to the converter and a capacitative-resistive timing network. The capacitor of the tirning network i3 arranged to be charged as the main capacitor i5 charged.
Means are provided for activating the control switching element of the control circuit by discharging electric charge of the capacitor of the timing network in response to the discharge of the main capacitor and for controlling the operation of the converter temporarily. Thus, voltage drop of the direct current power source is made less by making a current flowing to the converter decrease when the second load operates and during the time the switching element activates.
In accordance with a further embodiment of the in-vention there is provided a power supply arrangement for a flash device. r~he arranyement includes a direct current power source and a converter for converting a direct current voltage from the direct current power source to an alternat-ing current voltage. A rectifier rectifies the alternr~ting current voltage and a main capacitor is arranged to be charged by way of the rectifier. A first load is provided, and a trigger signal generator is also provided for initiating the discharge of the rna:in capacltor into the first load. A second load i~ connected to the current power source and a control circuit, including a control switching element, is connected to ~le converter an~ a capacitative-resistive timing network.
r~le capacitor of the tirning networX is arranged to be charged 2 ~
as the main capacitor is charged, and means are provided for activating the control switching element of the control c.ir-cuit by discharging electric charye of the capacitor of the timing network in response to actua-tion of rneans for activat-ing the trigger signal yenerator and for controlliny the operation of the converter temporarily. Thus, voltage drop of the direct current power source is rnade less b~ rnaking a current flowing to the converter decrease when the second load operates and during the time the switching elernent activates.
In accordance with a still further embodiment of the invention there is provided a power supply arrangement for a flash device. The arrangement includes a direct current power source circuit including a battery for providing a direct current voltage. A converter circuit converts the direct current voltage from the direct current power source circuit to an alternating current voltage. The converter circuit includes an oscillator circuit, a rectifier circuit for rectifying the alternating current voltage, and a charging circuit for storing electric charge and for supplying elec-trical energy to a flash tube circuit. I'he charying circuit includes a main storage capacitor and a first load circuit including a trigger signal generating circuit and a flash tube of the flash tube circuit. An oscillating control circuit includes a voltage detection circuit for detecting -that a voltaye o~ khe rnain storage capacitor of the charging circuit ~ecome3 a predete~Mined value. An oscillation stop timing performing circuit i~ provlded for performin~ repetition of on and off of the converter circuit. The oscillator circuit of the converter circuit includes an oscillation switch ele-ment functioning as a high value resistor when the oscillat-2 ~
ing operation of -the oscilla-tor circuit ceases. A bia~
control swi-tch element is provided for controlliny on and off operations of the oscillation switching elernent. ~he oscillation control circuit includes a voltaye detecting element for de-tecting that the voltaye of the main storage circuit of the charging circuit become~ the prede-termined value and for controlling the bias control switch element of the oscillator circuit.
Certain ernbodiments of the invention will now be - ~a ~ ~6~!i2 1 described by way of examples and with reference to the accom-panying drawings, where:in li~e parts in each of the several figures are identified by the same reference characte~r and wherein:
F.iyure 1 is a detailed circuit diayram of power supply arrangement for an optical apparatus accordlng to the present invention;
Figure 2 is a detailed circuit diagram of another power supply arrangement for an opt.ical apparatus according to the present invention, and Figure 3 is a detailed circu.it diagrarn of yet another power supply arrangement for an optical apparatus according to the present invention.
Referring to Figure 1 of the drawings, there is shown a power supply arrangement for a:n optical apparatus.
The power supply arrangement shown in Figure 1 comprises a direct current power source circuit A which includes a battery 10 and a power source switch 11 which is manually operated, a voltage converter ~ ~b -116~
circuit B for converting and boosting the ~oltage frorn the direct~current power source circuit A into an alternating cur-rent voltage, a rectifier circuit C for rectifyiny the boo~ted alternating current voltage from the volt~ge converter circui.t B, a charging ci.rcuit D for storing electrical energy supplied in the form of direct current from the rectifier circuit C and for supplying the electric energy to a first load circuit F
which includes a flash tube, a trigger signal generating circuit E for triggering the flash tube by applying a triggering signal to a trigger electrode of the flash tube, an oscillation control circuit G for controlling the voltage converter circuit and a second load circuit H to be driven by the direct-current power source circuit A in common with the flrst load circuit F.
The direct-current power source circuit A comprises a battery 10 and a power source switch 11 which is connected in series with the battery 10. The voltage converter circuit B
comprises, substantially, an oscillator circuit OC, an oscilla-tion starting circui~ OS. In more detail, the voltage converter circuit B includes an o~cillating transformer 12 having at least two winding such as a primary wi.nd.ing 12a, a secondary winding 12b and a third winding 12c, an o~cillation switching element in the form of a high performance sillicon tran~istor 13, an oscillating capacitor 14 and a current-restricting resi~tor 15. One terminal o-f the primary winding 12a is directly con-nected to a positive terminal of the battery 10, and other ter-minal of the primary winding 12a i8 connected to a collector electrode i.n ord~r to form the oscillator circuit OC. One terminal o~ the ~econdary winding 12b is connected to one termi-nal of the third windiny :L2c, and other terminal of the third winding 12c i~ connected to a juncture Jl of the primary windiny 12~ and the re~i~tor 15 in . ~
5 2 ~
order to constitute the oscillation startiny OS.
rrhe converter circuit B i~, substarltially, a vol-tage feedback type oscillator circui-t. The oscillating transistor 13 is of a hiyh performance NPN type, as is ex-plained herelnabove, and has high i.nternal resistance when it is cut-off state. Accordingly, the lea'kage current of the transistor 13 is extremely small and is nearly zero in com-parison with that of the Germanium transistor.
The rectifier circuit C,includes an electric valve in the form of a diode 16 of which a cathode electrode is connected to other terminal of the secondary winding 12b of the oscillating transformer 12, and the diode 16 is pro-vided so as to be reverse direction with respect to the pol-arity of the battery 10 of the direct current power source circuit A. The charging circuit D cornprises a main storage capacitor 17, a current-restrictlng resistor 18 and an in-dicating lamp in the form of a neon glow lamp 19 which is connected to the main storage capacitor 17 by way of the cur-rent restricting re4iqtor 18. One terminal of the capacitor 17 is connected to an anode electrode of the diode 16, and the other terminal of the capacitor 17 is connected to the emitter electrode of the oscillating transistor 13 and to a negative terminal of the battery 10 by way of the power source switch 11.
The trigger pu].se generating circuit E has a charg-iny re~ tor 20 o~ which one terrninal is connected to the one terminal o the main storage capacitor 17, a triggering cap-acitor 21 of which one terrninal is connected to the other tenninal of the charging resistor 20, a triggering trans-30 former 22 having a primary winding 22a and a secondary 22b, and a ~ynchronizing .switch 23 which is arranged to be ~wikched O~J and OFF in synchronizing with a camera shutter.
~3 ''~'' ~ 6 -.. .. .
~ ~B~21 The first load circuit F includes a ~as-filled flash tube 24.
The flash tube 24 is provided with a pair of main current conducting electrodes 2~a, 24b and a trigger electrode 27c which is positioned adjacent but exterrlal to the flash tube 24~ The trigger e].ectrode 27c is connected to one tertninal of the secondary windi.ny 22b of the -triggering transformer 22, and one main current conducting electrode 24a is conn-ected to other terminal of the secondary winding 22b.
The oscillation control circuit G comprises a charging resistor 25, an osclllation control capacitor 26 and a control switch element in the form of an oscillation con~
trol transistor 27. One terminal of the oscillation control capacitor 26 is connected to a base electrode of the oscill-ation control transistor ~7 of which collector-emitter path is connected to the oscillating capacitor 1~ of the voltage converter circuit B in parallel relatfLonship, and the other terminal of the oscillation control capacitor 26 is connected to a juncture J3 located between the diode 16 and the main storage capacitor 17 by way of the charging resistor 25 to form the oscillation control circuit G.
The second load circuit H is also actuated by the direct current power source circuit A. A data recording device K is provided as the second load circuit H, and com-prise~ an illuminating larnp 34 which is connected to the direct current power source circuit A by way o~ a driving ~witch 33 actua~ed in synchronizing with the camera shutter, a tran3~ucent data plate 35, carrying the data to be recorded, and provided at the front of the lamp 3~, a fo-cusing len~ 36 po~itioned between the data plate 35 and a film 37.
In operation, the power source switch 11 is man-ually operated by it~ ON and OFF starter. When the ~witch ,~ - 7 -~ ~6~52~
11 is in its OFF state, the oscillator circuit OC does not also activate is osc:illating operation, because the power source current is not connected to the voltaye converter circuit B. ~y turning the power source switch 11 ON, the base electrode of the transis-tor 13 i~ biaserl to cause the transistor 13 to become conductive, since the base current is supplied to the transistor 13 from the battery 10 of the power source circuit A by way of the resistor 15 and the third winding 12c of the oscillating transformer 12. When the transistor 13 turns ON, current Elows through the primary winding 12a of the oscillating transformer 12, the collector-emitter pa~h of the transistor 13 from the battery 10 and, at the same time, the current flows through the third winding 12c, the base-emitter path of the transistor 13, the battery 10 and the resistor 15, and the electric charge is accumulated on the oscillating capacitor 14 at the polarity as shown in Figure 1, and thereby the voltage converter circuit B comm-ences the oscillation and high alterna~ing current voltage i.s produced from the secondary windiny 12b o~ the oscillating trarlsformer 12. In this case, the os~illating voltage due to the stray capacity of the windings of the transformer 12 or the oscillating capacitor 14 is also employed to facilitate the ON and OFF operation of the oscillating transistor 13.
The high alternating current voltage is rectified by the diode 16 of the rectifier circuit C, to produce a high direct current vo.Ltage.
~ s each winding of the oscillating -transEormer 12 is wsund so that the base current increases, the trans.istor L3 becomes conAuctive h~ means of positive feed-back opera-tio~ of the transformer 12. The collector current almostlinearly increases with respect to time and the induced 5~1 voltage in the third winding 12c. The transient component of the base current of the transistor 13 decreases when the base current reaches to a peak value which peak value is determined by the induced voltage and the value of resistor 15. That i5 -to say, the increment of the collector current becomes non-linear, and does not increase any longer.
Accordingly, the induced voltage at the third winding 12c de-creases, and thereby the base current of the transistor 13 decreases, and then the collector current decreases swiftly.
Due to the decrement of the collector current, the transistor 13 is cut-off.
When the transistor 13 is in the non-conductive state, the current flowing through the third winding 12c of the oscillating transformer 12 is swiftly interrupted and then the energy l/2Ll x Ip2 stored on the oscillating capac-itor 14 appears at the third winding 12c as a reverse voltage with respect to the oscillating transistor 13 and the electric charge is stored on the oscillating capacitor 14. (Ll is an inductance ~H] and Ip is a peaX value of the collector current). In this case, the charging current o~ the capacitor 14 becomes oscillating current if leaving as it is, because the tranqistor 13 is cut-off. Under these conditions, the current which flows in the primary winding 12a of the oscill-ating transforrner 12 is also reversed at a half cycle of the oscillation of the charging current, and the voltage appears at the third win~ing 12c due to that current so as to bias the ~r~n~i~tor 13 forwardly. The transistor 13 is, therefore, biased again to be conductivc state.
The alternating current voltage induced at -the
by an identical power supply, immedia-tely after the flash tube generates the flash liyht. It is difficult to drive both the flash tube and the data recorder device or the rnotor driving device, because of the large arnount of power required to opera-te the fLash tube~ Accordingly, it is neees,sary to cause the power supply for flash tube to its OFF state during the activation of the data recording device or the motor driving device and to make the charging time of a charging circuit of the flash device short, in order to smookhly perforrn the activa-tion of the flash device and other load equipment.
OBJECT OF THE INVENTION
The prir~ry objeet of the invention is to provide a power supply arrangement for an optical apparatus which can effeetively operate a plurality of load equipment by eontrol-ling the O~-OFF timing automatically.
Another objeet of the present invention is to pro-vide an economieal and high performance power supply arrange-ment whieh eonsumes a small amount of electrieal energy to supply to a load circuit, by interrupting the current to be supplied to one load equipment during the time in which the other load equipment is actuated, and which is e,asy to operate as well as being convenient to use.
SUMMARY OF '~E INVENTIO~
In accordance with a particular embodiment of the invention there is provided a power supply arrangement Eor a flash device. The arrangement includes a direct current power souree, a converter for converting a direct current voltage froTn the direct current po~Jer source to an alternat-ing current voltage. A rectifier rectifies the alternatingcurrent voltage and a main capacitor is arranged to be charged ,, 5 2 ~
by way of a rectifier. A first load includes a flash tube and a trigger signal generator is provided for inltiating the discharye of the main capacitor into the firs-t load. A
second load is connected to the current power source, and a control circuik, including a con-trol switching element, is connected to the converter and a capacitative-resistive timing network. The capacitor of the tirning network i3 arranged to be charged as the main capacitor i5 charged.
Means are provided for activating the control switching element of the control circuit by discharging electric charge of the capacitor of the timing network in response to the discharge of the main capacitor and for controlling the operation of the converter temporarily. Thus, voltage drop of the direct current power source is made less by making a current flowing to the converter decrease when the second load operates and during the time the switching element activates.
In accordance with a further embodiment of the in-vention there is provided a power supply arrangement for a flash device. r~he arranyement includes a direct current power source and a converter for converting a direct current voltage from the direct current power source to an alternat-ing current voltage. A rectifier rectifies the alternr~ting current voltage and a main capacitor is arranged to be charged by way of the rectifier. A first load is provided, and a trigger signal generator is also provided for initiating the discharge of the rna:in capacltor into the first load. A second load i~ connected to the current power source and a control circuit, including a control switching element, is connected to ~le converter an~ a capacitative-resistive timing network.
r~le capacitor of the tirning networX is arranged to be charged 2 ~
as the main capacitor is charged, and means are provided for activating the control switching element of the control c.ir-cuit by discharging electric charye of the capacitor of the timing network in response to actua-tion of rneans for activat-ing the trigger signal yenerator and for controlliny the operation of the converter temporarily. Thus, voltage drop of the direct current power source is rnade less b~ rnaking a current flowing to the converter decrease when the second load operates and during the time the switching elernent activates.
In accordance with a still further embodiment of the invention there is provided a power supply arrangement for a flash device. The arrangement includes a direct current power source circuit including a battery for providing a direct current voltage. A converter circuit converts the direct current voltage from the direct current power source circuit to an alternating current voltage. The converter circuit includes an oscillator circuit, a rectifier circuit for rectifying the alternating current voltage, and a charging circuit for storing electric charge and for supplying elec-trical energy to a flash tube circuit. I'he charying circuit includes a main storage capacitor and a first load circuit including a trigger signal generating circuit and a flash tube of the flash tube circuit. An oscillating control circuit includes a voltage detection circuit for detecting -that a voltaye o~ khe rnain storage capacitor of the charging circuit ~ecome3 a predete~Mined value. An oscillation stop timing performing circuit i~ provlded for performin~ repetition of on and off of the converter circuit. The oscillator circuit of the converter circuit includes an oscillation switch ele-ment functioning as a high value resistor when the oscillat-2 ~
ing operation of -the oscilla-tor circuit ceases. A bia~
control swi-tch element is provided for controlliny on and off operations of the oscillation switching elernent. ~he oscillation control circuit includes a voltaye detecting element for de-tecting that the voltaye of the main storage circuit of the charging circuit become~ the prede-termined value and for controlling the bias control switch element of the oscillator circuit.
Certain ernbodiments of the invention will now be - ~a ~ ~6~!i2 1 described by way of examples and with reference to the accom-panying drawings, where:in li~e parts in each of the several figures are identified by the same reference characte~r and wherein:
F.iyure 1 is a detailed circuit diayram of power supply arrangement for an optical apparatus accordlng to the present invention;
Figure 2 is a detailed circuit diagram of another power supply arrangement for an opt.ical apparatus according to the present invention, and Figure 3 is a detailed circu.it diagrarn of yet another power supply arrangement for an optical apparatus according to the present invention.
Referring to Figure 1 of the drawings, there is shown a power supply arrangement for a:n optical apparatus.
The power supply arrangement shown in Figure 1 comprises a direct current power source circuit A which includes a battery 10 and a power source switch 11 which is manually operated, a voltage converter ~ ~b -116~
circuit B for converting and boosting the ~oltage frorn the direct~current power source circuit A into an alternating cur-rent voltage, a rectifier circuit C for rectifyiny the boo~ted alternating current voltage from the volt~ge converter circui.t B, a charging ci.rcuit D for storing electrical energy supplied in the form of direct current from the rectifier circuit C and for supplying the electric energy to a first load circuit F
which includes a flash tube, a trigger signal generating circuit E for triggering the flash tube by applying a triggering signal to a trigger electrode of the flash tube, an oscillation control circuit G for controlling the voltage converter circuit and a second load circuit H to be driven by the direct-current power source circuit A in common with the flrst load circuit F.
The direct-current power source circuit A comprises a battery 10 and a power source switch 11 which is connected in series with the battery 10. The voltage converter circuit B
comprises, substantially, an oscillator circuit OC, an oscilla-tion starting circui~ OS. In more detail, the voltage converter circuit B includes an o~cillating transformer 12 having at least two winding such as a primary wi.nd.ing 12a, a secondary winding 12b and a third winding 12c, an o~cillation switching element in the form of a high performance sillicon tran~istor 13, an oscillating capacitor 14 and a current-restricting resi~tor 15. One terminal o-f the primary winding 12a is directly con-nected to a positive terminal of the battery 10, and other ter-minal of the primary winding 12a i8 connected to a collector electrode i.n ord~r to form the oscillator circuit OC. One terminal o~ the ~econdary winding 12b is connected to one termi-nal of the third windiny :L2c, and other terminal of the third winding 12c i~ connected to a juncture Jl of the primary windiny 12~ and the re~i~tor 15 in . ~
5 2 ~
order to constitute the oscillation startiny OS.
rrhe converter circuit B i~, substarltially, a vol-tage feedback type oscillator circui-t. The oscillating transistor 13 is of a hiyh performance NPN type, as is ex-plained herelnabove, and has high i.nternal resistance when it is cut-off state. Accordingly, the lea'kage current of the transistor 13 is extremely small and is nearly zero in com-parison with that of the Germanium transistor.
The rectifier circuit C,includes an electric valve in the form of a diode 16 of which a cathode electrode is connected to other terminal of the secondary winding 12b of the oscillating transformer 12, and the diode 16 is pro-vided so as to be reverse direction with respect to the pol-arity of the battery 10 of the direct current power source circuit A. The charging circuit D cornprises a main storage capacitor 17, a current-restrictlng resistor 18 and an in-dicating lamp in the form of a neon glow lamp 19 which is connected to the main storage capacitor 17 by way of the cur-rent restricting re4iqtor 18. One terminal of the capacitor 17 is connected to an anode electrode of the diode 16, and the other terminal of the capacitor 17 is connected to the emitter electrode of the oscillating transistor 13 and to a negative terminal of the battery 10 by way of the power source switch 11.
The trigger pu].se generating circuit E has a charg-iny re~ tor 20 o~ which one terrninal is connected to the one terminal o the main storage capacitor 17, a triggering cap-acitor 21 of which one terrninal is connected to the other tenninal of the charging resistor 20, a triggering trans-30 former 22 having a primary winding 22a and a secondary 22b, and a ~ynchronizing .switch 23 which is arranged to be ~wikched O~J and OFF in synchronizing with a camera shutter.
~3 ''~'' ~ 6 -.. .. .
~ ~B~21 The first load circuit F includes a ~as-filled flash tube 24.
The flash tube 24 is provided with a pair of main current conducting electrodes 2~a, 24b and a trigger electrode 27c which is positioned adjacent but exterrlal to the flash tube 24~ The trigger e].ectrode 27c is connected to one tertninal of the secondary windi.ny 22b of the -triggering transformer 22, and one main current conducting electrode 24a is conn-ected to other terminal of the secondary winding 22b.
The oscillation control circuit G comprises a charging resistor 25, an osclllation control capacitor 26 and a control switch element in the form of an oscillation con~
trol transistor 27. One terminal of the oscillation control capacitor 26 is connected to a base electrode of the oscill-ation control transistor ~7 of which collector-emitter path is connected to the oscillating capacitor 1~ of the voltage converter circuit B in parallel relatfLonship, and the other terminal of the oscillation control capacitor 26 is connected to a juncture J3 located between the diode 16 and the main storage capacitor 17 by way of the charging resistor 25 to form the oscillation control circuit G.
The second load circuit H is also actuated by the direct current power source circuit A. A data recording device K is provided as the second load circuit H, and com-prise~ an illuminating larnp 34 which is connected to the direct current power source circuit A by way o~ a driving ~witch 33 actua~ed in synchronizing with the camera shutter, a tran3~ucent data plate 35, carrying the data to be recorded, and provided at the front of the lamp 3~, a fo-cusing len~ 36 po~itioned between the data plate 35 and a film 37.
In operation, the power source switch 11 is man-ually operated by it~ ON and OFF starter. When the ~witch ,~ - 7 -~ ~6~52~
11 is in its OFF state, the oscillator circuit OC does not also activate is osc:illating operation, because the power source current is not connected to the voltaye converter circuit B. ~y turning the power source switch 11 ON, the base electrode of the transis-tor 13 i~ biaserl to cause the transistor 13 to become conductive, since the base current is supplied to the transistor 13 from the battery 10 of the power source circuit A by way of the resistor 15 and the third winding 12c of the oscillating transformer 12. When the transistor 13 turns ON, current Elows through the primary winding 12a of the oscillating transformer 12, the collector-emitter pa~h of the transistor 13 from the battery 10 and, at the same time, the current flows through the third winding 12c, the base-emitter path of the transistor 13, the battery 10 and the resistor 15, and the electric charge is accumulated on the oscillating capacitor 14 at the polarity as shown in Figure 1, and thereby the voltage converter circuit B comm-ences the oscillation and high alterna~ing current voltage i.s produced from the secondary windiny 12b o~ the oscillating trarlsformer 12. In this case, the os~illating voltage due to the stray capacity of the windings of the transformer 12 or the oscillating capacitor 14 is also employed to facilitate the ON and OFF operation of the oscillating transistor 13.
The high alternating current voltage is rectified by the diode 16 of the rectifier circuit C, to produce a high direct current vo.Ltage.
~ s each winding of the oscillating -transEormer 12 is wsund so that the base current increases, the trans.istor L3 becomes conAuctive h~ means of positive feed-back opera-tio~ of the transformer 12. The collector current almostlinearly increases with respect to time and the induced 5~1 voltage in the third winding 12c. The transient component of the base current of the transistor 13 decreases when the base current reaches to a peak value which peak value is determined by the induced voltage and the value of resistor 15. That i5 -to say, the increment of the collector current becomes non-linear, and does not increase any longer.
Accordingly, the induced voltage at the third winding 12c de-creases, and thereby the base current of the transistor 13 decreases, and then the collector current decreases swiftly.
Due to the decrement of the collector current, the transistor 13 is cut-off.
When the transistor 13 is in the non-conductive state, the current flowing through the third winding 12c of the oscillating transformer 12 is swiftly interrupted and then the energy l/2Ll x Ip2 stored on the oscillating capac-itor 14 appears at the third winding 12c as a reverse voltage with respect to the oscillating transistor 13 and the electric charge is stored on the oscillating capacitor 14. (Ll is an inductance ~H] and Ip is a peaX value of the collector current). In this case, the charging current o~ the capacitor 14 becomes oscillating current if leaving as it is, because the tranqistor 13 is cut-off. Under these conditions, the current which flows in the primary winding 12a of the oscill-ating transforrner 12 is also reversed at a half cycle of the oscillation of the charging current, and the voltage appears at the third win~ing 12c due to that current so as to bias the ~r~n~i~tor 13 forwardly. The transistor 13 is, therefore, biased again to be conductivc state.
The alternating current voltage induced at -the
3~ ~condary ~inding 12b i~ rectified by the diode 16, and there-by the current flows in a current loop formed by the secon-' ': -- g 21~
) 1645~1 dary winding 12b of the oscillating transforMer 12, thebase-emitter path of the oscillating transistor 13, -the rnain storage capacitor 17 and the diode 16. By this current, the electric charge is stored on the rnain storage 71 ~
9a -t 1~52 ~
capacitor 17 o~ the charging circuit ~, at; a polarity s~s flhown ln ~i`igure 1, and, at the ~;ame tir~e, the elect;ric charge i~ aLso accumulated on the oscillation control capacitor ~'~ o~ the osci-llator control circuit; ~, at -the polari-ty as shown in the draw-ing. ~i'urther, the electric chslrge iS storecl on the trig~gerirl~7capacitor 21 due to the current I~lowin~,~ through fl current loop consis-tin~ of the secondary winding 12h, the base-emitter pa-th o~
the transistor 13, the triggering capacitor 21, the chargin~
resistor 20 and the diode 1~, owing to the recti~ying operation o~ the recti~ier circuit a.
When the main storage capacitor 17 is :eully charged up to the predetermined and suitable voltage, the neon glow lamp 19 lights - indicating that the device is in readiness for the ~lash tube 24 to be ~ired. The ~lash tube 24 may then be ~ired by closing of the switch 23 in synchronizing with the camera shutter. It will be appreciated that this closing need only be momentary during the actuation o~ the camera shutter. By closing the switch 23, the electric charge on the tri~gering capacitor 21 discharges through the ~witch 2~ and the prirnary winding 22a. Then high vol--tage pul~e ~uch a~ ~000 volt,~ induced at the secondary winding 22b o~ the triggering transYorr~er 22 appears at the trig~ering electrode 24c o~ the ~lash tube 24 and ioni~es a portion o~ the gas in the ~]ash tube 24~ The main ~torage capacitor 17 then discharges acro~s th~ betw~en the ruain curren-t conducting electrodes 24a and 24b, producin~ a brilli.ant ~:La~h of illumination. A~ter the rnairl )tora~e caplc:itor 17 has been discharged, a terminal voltage o~ the maln ~tora~e capaci~or 17 becolne~ low, and thereby the ~lectric char~e ~torf3d on the o~cilLl-tion control capacitor 26 is a,u~ornatic111y difJchs~r~d by way oI' thc base-ernitter path o~ -the ~,!,) of3cil'Latin~ tranlis-tur 13, (and th~ oscillating capacitor 14), 5 2 ~
the main storage capacitor 17 (the flash tube 24) and the capacitor 26. By discharging of the capacitor 26, a positive potential appears at the base circuitry of the transistor 27 and, as a result, the transistor 27 becomes conductive.
When the transi.stor 27 becornes ON, both of the base-emitter path of the oscillating transistor 13 and the o~cillating capacitor 14 are short-circuited and then the oscillating operation of the oscillator circuit OC is stopped. Con-sequently, the charging current to the capacitors 17, 21 and 26 is interrupted by the inactivation of the oscillator circuit of the voltage converter circuit B. In this case, the power of the battery 10 is not, also, supplied to the first load circuit F.
On the other hand, the driving switch 33 is closed in synchronizing with the synchronizing switch 23, in the second load circuit H. By closure of the driving switch 33, current is supplied from the battery 10 to the illuminating lamp 34 to produce a brilliant light. The light produced from the lamp 34 passes to the focusing lens 36 through the data plate 35. A ~ocused li~ht by the lens 36 illuminates the film 37 in order to photograph the data recorded in the data plate 35. It will be appreciated that the other load equipments may also be used instead of the data recording device K.
The oscillation control transistor 27 is turned OFF
a~ter the time interval when the positive potential is applied to the base electrode of the transistor 27, which time interval is determined by the discharging characteris- -tic3 of the oscillat.ion control capacitor 26, and the transis-tor 27 is ~urned OFF when the base potential becomes zero.
After the transistor 27 is turned OFF, the oscillating transi~tor 13 becornes conductive and the oscillator circuit 'P
3 ~8~52~
OC begins again the oscillating operation to activate the voltage converter circuit B. The s-top time duration of the oscillator circuit OC may be set by deciding a resistance value of the charging circuit 25 and a capacitance value of the oscillating control capacitor 26.
In accordance with the power supply arrangement of Figure 1, since the high performance transistor 13 is employed in the oscillator circuit ~~ of the voltage converter circuit B, the loss of energy is prevented even when the power source switch 11 is left in its 0~ state for a long tiTne period.
Further, the circuit construction is simplified and is eas~
to manufacture and is economical because the voltage conver-ter circuit B is automatically operated in its ON and OFF
operations without using any mechanical switch in the voltage converter circuit B.
Furthermore, the power supply arrangement shown in Figure 1 is convenient to operate the plurality of load equipments ~ well as the high reliability, because the oscillator circuit OC can be automatically made ON and OFF.
Figure 2 shows a modification of a power supply arrangement for an optical apparatus of Figure 1. In accord-ance with the power supply arrangement of Figure 2, an oscillation control circuit G is provided between an oscill-ator circuit OC of a voltage converter circuit B and a trigger signal generating circuit E. In rnore detail, an oscillation control s~ ch element in the form of an oscillation control transistor 27 is connected so as to be connected in parallel relationship with respect to the oscillat.ing capacitor 14 and base-emitter path of the o~cillating transistor 13. The oscillation control capacitor 26 is connected between a base electrode and a juncture J4 of the charging resistor 20 an~ the triggering capacitor 21 through the charging resistor ~, .
25 in the trigger signal generating circuit E.
According to the power supply ~rranyement of Figure 2, when the main s-torage capacitor 17 is fully ch~ryed up to the predetermined voltage value, the electric charge is stored on the capacitor 26 of -the oscillation control circuit G at the polarity as shown in Figure 2. The eleckric charge of the main storage capacitor 17 i.5 discharged through a flash tube 24 by closing a synchronizing switch 23, and therea~ter the terminal voltage of the main storage cap-acitor decreases. Under these conditions, closed loops areformed by the oscillation control capacitor 26, the base-emitter path of the control transistor 27, the synchronizing switch 23, the primary winding 22a and the charging resistor 25 during the time synchronizing switch 23 is closed. Accord-ingly, the electric charge stored on the capacitor 26 is also discharged through the above described closed loop, and thereby a positive potential appears at the base 01ectrode of the control transistor 27. By the positive potential, the control transistor Z7 is rendered to be conductive. When the control transistor 27 becomes conductive~ the oscillat-ing transistor 13 is made non-conductive because the oscill-ating capacitor 14 is short-circuited by the control trans istor 27. By turning the oscillating transistor 13 OFF, the oscillating operation of the oscillator circuit OC is ceased, and thereby the current supply to the main storage capacitor is stopped. When the oscillating operation of the o.scillator circuit OC is stopped, the current from the direct current power s~urce circuit A can be sufficiently supplied to the second load circuit H by closing the switch 28 in 3ynchronizing with the synchronizing switch 23.
According to the power supply arrangement of Figure 2, the oscillating transistor 13 is turned OFF and the os-~ 1~4~21 cillating operation of the oscillator circuit OC can also be stopped by closing -the synchronizing switch 23 and thereby can operate the second load equipment, even when the main storage capacitor is not so fully charged, becau3e the os-cillation control circuit G is provided between the voltage converter circuit B and the trigger ~igna:L yenfrating cir-cuit E.
Additionally, PNP type transistors can be used instead of the transistors 13 and 27 in the above described embodiment, in order to perform the same function as that of the arrangement of Figure 2.
In the arrangements of Figures 1 and 2, the oscill-ating operations are not perfectly stopped, in some cases, but are slightly continued in spite of the fact that the transistor 27 operates, when, for example, the ambient temperature is high. Since the voltage drop of the direct current power source 10, however, is very low in the slight oscillation of the converter, the advantages de~cribed above can be fully obtained.
Figure 3 is illustrative of other ernbodiments of th~ present invention, and a power supply arrangement com-prises, similar to the arrangement of Figure 2, a direct current power source circuit A ~or use of a pair of load equipmentg 7 a voltage converter circuit B for converting a direct current voltage to an alternating current voltage, a rectifier circuit C for rectifying the alternating current voltage ~rorn the voltage converter circuit B to a direct current voltage, a charging circuit D for storing the elec-tric energy to be supplied to a fir~t load equiprnent, a trigger ~ignal generating circuit E for triggering the first load equiprnent F and an oscillation control circuit G, said power supply arrangement further comprises an oscillation stop timing control and adju~tiny circuit I for adjusting the ~ 14 -5 ~ ~
oscillation stop timing.
Specif.ically, an oscillation starting circuit OS
of the voltage converter circuit B comprises a resistor 15 of which one terminal is connected to a juncture Jl located between a battery 10 and a primary wind:ing 12a of an oscill-ating transformer 12, a third winding 12c of the -transformer 12, an oscillation control switch in the form of a switching -- l~c~
) 1645~1 dary winding 12b of the oscillating transforMer 12, thebase-emitter path of the oscillating transistor 13, -the rnain storage capacitor 17 and the diode 16. By this current, the electric charge is stored on the rnain storage 71 ~
9a -t 1~52 ~
capacitor 17 o~ the charging circuit ~, at; a polarity s~s flhown ln ~i`igure 1, and, at the ~;ame tir~e, the elect;ric charge i~ aLso accumulated on the oscillation control capacitor ~'~ o~ the osci-llator control circuit; ~, at -the polari-ty as shown in the draw-ing. ~i'urther, the electric chslrge iS storecl on the trig~gerirl~7capacitor 21 due to the current I~lowin~,~ through fl current loop consis-tin~ of the secondary winding 12h, the base-emitter pa-th o~
the transistor 13, the triggering capacitor 21, the chargin~
resistor 20 and the diode 1~, owing to the recti~ying operation o~ the recti~ier circuit a.
When the main storage capacitor 17 is :eully charged up to the predetermined and suitable voltage, the neon glow lamp 19 lights - indicating that the device is in readiness for the ~lash tube 24 to be ~ired. The ~lash tube 24 may then be ~ired by closing of the switch 23 in synchronizing with the camera shutter. It will be appreciated that this closing need only be momentary during the actuation o~ the camera shutter. By closing the switch 23, the electric charge on the tri~gering capacitor 21 discharges through the ~witch 2~ and the prirnary winding 22a. Then high vol--tage pul~e ~uch a~ ~000 volt,~ induced at the secondary winding 22b o~ the triggering transYorr~er 22 appears at the trig~ering electrode 24c o~ the ~lash tube 24 and ioni~es a portion o~ the gas in the ~]ash tube 24~ The main ~torage capacitor 17 then discharges acro~s th~ betw~en the ruain curren-t conducting electrodes 24a and 24b, producin~ a brilli.ant ~:La~h of illumination. A~ter the rnairl )tora~e caplc:itor 17 has been discharged, a terminal voltage o~ the maln ~tora~e capaci~or 17 becolne~ low, and thereby the ~lectric char~e ~torf3d on the o~cilLl-tion control capacitor 26 is a,u~ornatic111y difJchs~r~d by way oI' thc base-ernitter path o~ -the ~,!,) of3cil'Latin~ tranlis-tur 13, (and th~ oscillating capacitor 14), 5 2 ~
the main storage capacitor 17 (the flash tube 24) and the capacitor 26. By discharging of the capacitor 26, a positive potential appears at the base circuitry of the transistor 27 and, as a result, the transistor 27 becomes conductive.
When the transi.stor 27 becornes ON, both of the base-emitter path of the oscillating transistor 13 and the o~cillating capacitor 14 are short-circuited and then the oscillating operation of the oscillator circuit OC is stopped. Con-sequently, the charging current to the capacitors 17, 21 and 26 is interrupted by the inactivation of the oscillator circuit of the voltage converter circuit B. In this case, the power of the battery 10 is not, also, supplied to the first load circuit F.
On the other hand, the driving switch 33 is closed in synchronizing with the synchronizing switch 23, in the second load circuit H. By closure of the driving switch 33, current is supplied from the battery 10 to the illuminating lamp 34 to produce a brilliant light. The light produced from the lamp 34 passes to the focusing lens 36 through the data plate 35. A ~ocused li~ht by the lens 36 illuminates the film 37 in order to photograph the data recorded in the data plate 35. It will be appreciated that the other load equipments may also be used instead of the data recording device K.
The oscillation control transistor 27 is turned OFF
a~ter the time interval when the positive potential is applied to the base electrode of the transistor 27, which time interval is determined by the discharging characteris- -tic3 of the oscillat.ion control capacitor 26, and the transis-tor 27 is ~urned OFF when the base potential becomes zero.
After the transistor 27 is turned OFF, the oscillating transi~tor 13 becornes conductive and the oscillator circuit 'P
3 ~8~52~
OC begins again the oscillating operation to activate the voltage converter circuit B. The s-top time duration of the oscillator circuit OC may be set by deciding a resistance value of the charging circuit 25 and a capacitance value of the oscillating control capacitor 26.
In accordance with the power supply arrangement of Figure 1, since the high performance transistor 13 is employed in the oscillator circuit ~~ of the voltage converter circuit B, the loss of energy is prevented even when the power source switch 11 is left in its 0~ state for a long tiTne period.
Further, the circuit construction is simplified and is eas~
to manufacture and is economical because the voltage conver-ter circuit B is automatically operated in its ON and OFF
operations without using any mechanical switch in the voltage converter circuit B.
Furthermore, the power supply arrangement shown in Figure 1 is convenient to operate the plurality of load equipments ~ well as the high reliability, because the oscillator circuit OC can be automatically made ON and OFF.
Figure 2 shows a modification of a power supply arrangement for an optical apparatus of Figure 1. In accord-ance with the power supply arrangement of Figure 2, an oscillation control circuit G is provided between an oscill-ator circuit OC of a voltage converter circuit B and a trigger signal generating circuit E. In rnore detail, an oscillation control s~ ch element in the form of an oscillation control transistor 27 is connected so as to be connected in parallel relationship with respect to the oscillat.ing capacitor 14 and base-emitter path of the o~cillating transistor 13. The oscillation control capacitor 26 is connected between a base electrode and a juncture J4 of the charging resistor 20 an~ the triggering capacitor 21 through the charging resistor ~, .
25 in the trigger signal generating circuit E.
According to the power supply ~rranyement of Figure 2, when the main s-torage capacitor 17 is fully ch~ryed up to the predetermined voltage value, the electric charge is stored on the capacitor 26 of -the oscillation control circuit G at the polarity as shown in Figure 2. The eleckric charge of the main storage capacitor 17 i.5 discharged through a flash tube 24 by closing a synchronizing switch 23, and therea~ter the terminal voltage of the main storage cap-acitor decreases. Under these conditions, closed loops areformed by the oscillation control capacitor 26, the base-emitter path of the control transistor 27, the synchronizing switch 23, the primary winding 22a and the charging resistor 25 during the time synchronizing switch 23 is closed. Accord-ingly, the electric charge stored on the capacitor 26 is also discharged through the above described closed loop, and thereby a positive potential appears at the base 01ectrode of the control transistor 27. By the positive potential, the control transistor Z7 is rendered to be conductive. When the control transistor 27 becomes conductive~ the oscillat-ing transistor 13 is made non-conductive because the oscill-ating capacitor 14 is short-circuited by the control trans istor 27. By turning the oscillating transistor 13 OFF, the oscillating operation of the oscillator circuit OC is ceased, and thereby the current supply to the main storage capacitor is stopped. When the oscillating operation of the o.scillator circuit OC is stopped, the current from the direct current power s~urce circuit A can be sufficiently supplied to the second load circuit H by closing the switch 28 in 3ynchronizing with the synchronizing switch 23.
According to the power supply arrangement of Figure 2, the oscillating transistor 13 is turned OFF and the os-~ 1~4~21 cillating operation of the oscillator circuit OC can also be stopped by closing -the synchronizing switch 23 and thereby can operate the second load equipment, even when the main storage capacitor is not so fully charged, becau3e the os-cillation control circuit G is provided between the voltage converter circuit B and the trigger ~igna:L yenfrating cir-cuit E.
Additionally, PNP type transistors can be used instead of the transistors 13 and 27 in the above described embodiment, in order to perform the same function as that of the arrangement of Figure 2.
In the arrangements of Figures 1 and 2, the oscill-ating operations are not perfectly stopped, in some cases, but are slightly continued in spite of the fact that the transistor 27 operates, when, for example, the ambient temperature is high. Since the voltage drop of the direct current power source 10, however, is very low in the slight oscillation of the converter, the advantages de~cribed above can be fully obtained.
Figure 3 is illustrative of other ernbodiments of th~ present invention, and a power supply arrangement com-prises, similar to the arrangement of Figure 2, a direct current power source circuit A ~or use of a pair of load equipmentg 7 a voltage converter circuit B for converting a direct current voltage to an alternating current voltage, a rectifier circuit C for rectifying the alternating current voltage ~rorn the voltage converter circuit B to a direct current voltage, a charging circuit D for storing the elec-tric energy to be supplied to a fir~t load equiprnent, a trigger ~ignal generating circuit E for triggering the first load equiprnent F and an oscillation control circuit G, said power supply arrangement further comprises an oscillation stop timing control and adju~tiny circuit I for adjusting the ~ 14 -5 ~ ~
oscillation stop timing.
Specif.ically, an oscillation starting circuit OS
of the voltage converter circuit B comprises a resistor 15 of which one terminal is connected to a juncture Jl located between a battery 10 and a primary wind:ing 12a of an oscill-ating transformer 12, a third winding 12c of the -transformer 12, an oscillation control switch in the form of a switching -- l~c~
4~2 1 control transistor 29 of which a collector elec-trode i~ a juncture J2 of the third winding 12c and a ,secondary winding 12b of the oscillating transformer 12, a biasiny resistor 30 and a surge absorbiny capacitor 4~. An emitter elec-trode of the tran.sistor 29 is conrlected to a base elec-trode of an oscillating ~b
5 2 ~
transistor 13 and one terminal of an oscillating capacitor 1~, and the resistor 30 is connected between -the collector electrode and a base electrode of the transi3tor 29. ~he oscillatiorl control circuit G comprises a voltage detecting element in the form of a neon glow lamp 31 connected to the base electrode of the tran~istor 29 and the re~i3tor 30 and an 03cillation control capacitor 26 connected to the neon glow lamp 31 in parallel relationship. ~he oscillation stop timing control circuit I
comprises a charging resistor 25 connected between a juncture J3 and the neon glow lamp 31 and a voltage dividing variable resistor 32 connected between a juncture J$ of the charging resistor 25 and the neon glow lamp 31.
In the power supply arrangement, a zener diode and a trigger diode may employed as the voltage detecting element in-stead of the neon glow lamp 31. ., In operation 3 when a power source switc~ 11 is closed, the current initially flows from the battery 10 of the power source circuit A by way of the resistor 15, the third winding 12c of the oscillating transformer 12, the resistor 30, the oscillation control capacitor 26 and the variable re~istor 32, and thereby the oscillation control transi3tor 29 is made con-ductive. When the transistor 29 becomes conductive, current is ~upplied from the battery 10 by way of the resistor 15, the third winding 12c and a collector-emitter path of the oscillation con-trol transistor 29 to the oscillating capacitor 14. ~he oscil-lating transi~t~r 13 becomes conductive due to the electric charge of the capacitor 1~ and the o~cillator circuit OC co~-mences the oscillating ope~ation. By the oscillating operation of the os-illator circuit OC, a high alternating current voltage is induced at the seconda:ry winding 12b of the oscillating transformer 12~ The alternating current voltage i~ rectified ~y the diode 16 of the rectifier circuit C, and a direct-"
current flows in a current loop for~(le~ by the secor~ ry ~,li.rlr3irlg~:L~
the collec-tor-emitte:r path of the txanfl:l.s10Y ~, a base-e(~litlif~r p,1l,h o~ the tranf3if~lor 1~, -the ~nain ;;torage ca~jac:itor :ll and the tl.io~e l~
and, a-t -the sarne -tlmf3, l.n a current loo~ ~orrrled b~l secorldclry w:ind.i.ng 12b, the res:istjol ~(), -thf capacitor 26, thfi resi.f)-tor 25 arld the diode 16. AccordirlgLy, -the rflairl sto.rage capaci.l;or :l/ arld the o-Jcl--llation control capacitor 26 are, respectively, charged a-t -the polarity as r3hown in h1igure ~. ~ur-ther, the electric charge is also stored on a triggering capacitor 21 oY the tri~ger rJig~na].~erlera---ting circuit ~ by -the current f:Lowin~ by way o~ the dio~e~ 16, the secondary winding 12b, the tranæif3tor 3S and 1.2, the rer;istor 33 the capacitor 21 and the resistor 20.
When the main r3torage capacitor 17 is charged up to the pre~
determined voltage, the neon glow lamp 31 in the osci.llation control circuit G is ~ired by a voltage potentia:L in a closed loop :~ormed by the main storage capacitor 17, the resistor 25, the neon glow la~p 31 and the base electrode o~ the oscillation control transistor 29. In this case, lighting voltage of the neon glow larnp 31 is appro~imately set to the maximum char~ing voltage o~ the lQGIin stor-a~e capacitor lr/. When the neon glow larQp 31 ill~ninates, thenegative potential appears at the base elec-t:rode o~ the transistor 29, and thereby the transistor 29 is rendered cut-o~. When the transistor 29 becomes non-conductive, the oscillating opera-tion o~ the of~cillator circuit UC i S stopped, because the current is ~5 interrupte(l between the of3cillating trans~orMer ].2 and -the base electrode o~ the o~)cilla-tirlg transistor :L~.
hrl clC tl~.'l'tiOrl v~ tag~e ol.' tihf3 rnain 3torage capaci-tor 1l can be set, to r-~uch as, ~or example, ~0 volts, arl~l t;he secon~ary win-ling :l.2b i.~, ln t,his caf3~, Sf3t; f.~o that the alternatlng currerlt; voltage ~J o~ 45~ voll;s :if.~ inducf3~ therf3~rorn. When the main s-torage capacitor 5 2 ~ .
17 is chclrged up to the preset voltage r-,uch as ths ~() VO1~ the neon glow lamp ~1 ,iLlu~ninates and the or,~ci.l.Lator clrcllit (J~ ~to~J
it;s operation. When the oLJcillating oI)erat:k~n,i.s ces~L~ed, the ter minal voltage of the rnain storage capacitoY gradl1e,lly decreases to a given value such a,~.3, f.'or exarnple, ~2~ vo1tc" and then -!;he neon glow larnp 31. ls exl;inguishe(l. When -th0 ne()rl glow 'I,arr~ L e~l;1,ng~ui-shed, -the potential at the base e:l.ec-trode o~ the oscillati.on control transistor 2g gradually increases, and the transistor 29 turns on.
When the transistor 29 becomes conductive, the base current is supplied to the base electrode o e the oscil:Lati.ng trans.ir3to:r l3 from the battery lO -to make the transistor 13 ON, and. t;here'by the oscillating operation is again started. 'l1he charging resistor 25 and the voltage dividing variable resistor 32 are employed for setting the actuation voltage of the main storage capacitor 17.
~articularly, the charging maximum voltage of the Main storage capacitor 17 is adjusted by the vol.tage divid.ing variable resistor 32. ~ioreeurther, the capacitor 26 activates the functions for making the flickering action of the neon glow lamp 31 east and ~or elimin.atin~ a voltage hysterisis of the .lamp 31 in flickering.
'~he maximurrl charging vol-tage o~' the alain stora~ oclpacitor 17 can be always set to the constant value, becau-e the neon glow 'Lamp 31 detects the charging voltage o~ the capacitor 17 an~ stops the activation O-.e the volta~e converter circuit ~ a-t p.rede-termined vol1,age~ value o~ the main sto,rage capaci~or Lr/ by con-trolling the ~N and OF1~ ope.ra-tionf3 ol' the control tran~istor 29. Accordingly, thf3 or-~cillf.lting 1iransformer L~ oI' which ~secondary winding voltage i,fl hi~h ~)llC~L ~IJ ~JO voLl,~,3rrla,l/ b~ u,cJed in order to rrlake charg,ing tifne conL-3tant f3hort. l~'urt~le:r, a salal~ ca~pabili-l"y t:ranr)istor ~lay 'b~ U3ed ~lf:~ the control tranf;ifJtor 29.
ccording to t~lf3 L)o~1fr supLj:Ly arrang,~errlcnt, i.-t iS convenien-t 2 l to take a picture continuou~31y, as well as the elf,'C tr:ic, fl.~,h d f`'`/iC*
is easy to opera-te, 3ince the charg.i.rl~ t:irae cons~l,ar)l, ~ f~Jnal.:L.
~'urther, the power supp:Ly aIrange~lent, ic.~ very c.,onl/erl:ient to o~errliJf -the plurality of load e~uipment~-3, since the~ cha.r~in~S l;i~ae of the rnain storage capa(itor of -the char~ing circlLl~ smal 1.
In view of the above~ it will be seen that the several obj f'C t,'-3 o~ the invention are achieved and other advantageous results at-tained.
2~
~() -- ] ~
transistor 13 and one terminal of an oscillating capacitor 1~, and the resistor 30 is connected between -the collector electrode and a base electrode of the transi3tor 29. ~he oscillatiorl control circuit G comprises a voltage detecting element in the form of a neon glow lamp 31 connected to the base electrode of the tran~istor 29 and the re~i3tor 30 and an 03cillation control capacitor 26 connected to the neon glow lamp 31 in parallel relationship. ~he oscillation stop timing control circuit I
comprises a charging resistor 25 connected between a juncture J3 and the neon glow lamp 31 and a voltage dividing variable resistor 32 connected between a juncture J$ of the charging resistor 25 and the neon glow lamp 31.
In the power supply arrangement, a zener diode and a trigger diode may employed as the voltage detecting element in-stead of the neon glow lamp 31. ., In operation 3 when a power source switc~ 11 is closed, the current initially flows from the battery 10 of the power source circuit A by way of the resistor 15, the third winding 12c of the oscillating transformer 12, the resistor 30, the oscillation control capacitor 26 and the variable re~istor 32, and thereby the oscillation control transi3tor 29 is made con-ductive. When the transistor 29 becomes conductive, current is ~upplied from the battery 10 by way of the resistor 15, the third winding 12c and a collector-emitter path of the oscillation con-trol transistor 29 to the oscillating capacitor 14. ~he oscil-lating transi~t~r 13 becomes conductive due to the electric charge of the capacitor 1~ and the o~cillator circuit OC co~-mences the oscillating ope~ation. By the oscillating operation of the os-illator circuit OC, a high alternating current voltage is induced at the seconda:ry winding 12b of the oscillating transformer 12~ The alternating current voltage i~ rectified ~y the diode 16 of the rectifier circuit C, and a direct-"
current flows in a current loop for~(le~ by the secor~ ry ~,li.rlr3irlg~:L~
the collec-tor-emitte:r path of the txanfl:l.s10Y ~, a base-e(~litlif~r p,1l,h o~ the tranf3if~lor 1~, -the ~nain ;;torage ca~jac:itor :ll and the tl.io~e l~
and, a-t -the sarne -tlmf3, l.n a current loo~ ~orrrled b~l secorldclry w:ind.i.ng 12b, the res:istjol ~(), -thf capacitor 26, thfi resi.f)-tor 25 arld the diode 16. AccordirlgLy, -the rflairl sto.rage capaci.l;or :l/ arld the o-Jcl--llation control capacitor 26 are, respectively, charged a-t -the polarity as r3hown in h1igure ~. ~ur-ther, the electric charge is also stored on a triggering capacitor 21 oY the tri~ger rJig~na].~erlera---ting circuit ~ by -the current f:Lowin~ by way o~ the dio~e~ 16, the secondary winding 12b, the tranæif3tor 3S and 1.2, the rer;istor 33 the capacitor 21 and the resistor 20.
When the main r3torage capacitor 17 is charged up to the pre~
determined voltage, the neon glow lamp 31 in the osci.llation control circuit G is ~ired by a voltage potentia:L in a closed loop :~ormed by the main storage capacitor 17, the resistor 25, the neon glow la~p 31 and the base electrode o~ the oscillation control transistor 29. In this case, lighting voltage of the neon glow larnp 31 is appro~imately set to the maximum char~ing voltage o~ the lQGIin stor-a~e capacitor lr/. When the neon glow larQp 31 ill~ninates, thenegative potential appears at the base elec-t:rode o~ the transistor 29, and thereby the transistor 29 is rendered cut-o~. When the transistor 29 becomes non-conductive, the oscillating opera-tion o~ the of~cillator circuit UC i S stopped, because the current is ~5 interrupte(l between the of3cillating trans~orMer ].2 and -the base electrode o~ the o~)cilla-tirlg transistor :L~.
hrl clC tl~.'l'tiOrl v~ tag~e ol.' tihf3 rnain 3torage capaci-tor 1l can be set, to r-~uch as, ~or example, ~0 volts, arl~l t;he secon~ary win-ling :l.2b i.~, ln t,his caf3~, Sf3t; f.~o that the alternatlng currerlt; voltage ~J o~ 45~ voll;s :if.~ inducf3~ therf3~rorn. When the main s-torage capacitor 5 2 ~ .
17 is chclrged up to the preset voltage r-,uch as ths ~() VO1~ the neon glow lamp ~1 ,iLlu~ninates and the or,~ci.l.Lator clrcllit (J~ ~to~J
it;s operation. When the oLJcillating oI)erat:k~n,i.s ces~L~ed, the ter minal voltage of the rnain storage capacitoY gradl1e,lly decreases to a given value such a,~.3, f.'or exarnple, ~2~ vo1tc" and then -!;he neon glow larnp 31. ls exl;inguishe(l. When -th0 ne()rl glow 'I,arr~ L e~l;1,ng~ui-shed, -the potential at the base e:l.ec-trode o~ the oscillati.on control transistor 2g gradually increases, and the transistor 29 turns on.
When the transistor 29 becomes conductive, the base current is supplied to the base electrode o e the oscil:Lati.ng trans.ir3to:r l3 from the battery lO -to make the transistor 13 ON, and. t;here'by the oscillating operation is again started. 'l1he charging resistor 25 and the voltage dividing variable resistor 32 are employed for setting the actuation voltage of the main storage capacitor 17.
~articularly, the charging maximum voltage of the Main storage capacitor 17 is adjusted by the vol.tage divid.ing variable resistor 32. ~ioreeurther, the capacitor 26 activates the functions for making the flickering action of the neon glow lamp 31 east and ~or elimin.atin~ a voltage hysterisis of the .lamp 31 in flickering.
'~he maximurrl charging vol-tage o~' the alain stora~ oclpacitor 17 can be always set to the constant value, becau-e the neon glow 'Lamp 31 detects the charging voltage o~ the capacitor 17 an~ stops the activation O-.e the volta~e converter circuit ~ a-t p.rede-termined vol1,age~ value o~ the main sto,rage capaci~or Lr/ by con-trolling the ~N and OF1~ ope.ra-tionf3 ol' the control tran~istor 29. Accordingly, thf3 or-~cillf.lting 1iransformer L~ oI' which ~secondary winding voltage i,fl hi~h ~)llC~L ~IJ ~JO voLl,~,3rrla,l/ b~ u,cJed in order to rrlake charg,ing tifne conL-3tant f3hort. l~'urt~le:r, a salal~ ca~pabili-l"y t:ranr)istor ~lay 'b~ U3ed ~lf:~ the control tranf;ifJtor 29.
ccording to t~lf3 L)o~1fr supLj:Ly arrang,~errlcnt, i.-t iS convenien-t 2 l to take a picture continuou~31y, as well as the elf,'C tr:ic, fl.~,h d f`'`/iC*
is easy to opera-te, 3ince the charg.i.rl~ t:irae cons~l,ar)l, ~ f~Jnal.:L.
~'urther, the power supp:Ly aIrange~lent, ic.~ very c.,onl/erl:ient to o~errliJf -the plurality of load e~uipment~-3, since the~ cha.r~in~S l;i~ae of the rnain storage capa(itor of -the char~ing circlLl~ smal 1.
In view of the above~ it will be seen that the several obj f'C t,'-3 o~ the invention are achieved and other advantageous results at-tained.
2~
~() -- ] ~
Claims (25)
1. A power supply arrangement for a flash device comprising a direct current power source, a converter for converting a direct current voltage from said direct current power source to an alternating current voltage, a rectifier for rectifying said alternating current voltage, a main capacitor arranged to be charged by way of the rectifier, a first load including a flash tube, a trigger signal generator for initiating the discharge of the main capacitor into the first load, a second load connected to said current power source, a control circuit including a control switching element connected to said converter and a capacitative-resistive timing network, the capacitor of said timing network being arranged to be charged as the main capacitor is charged, and means for activating said control switching element of the control circuit by discharging electric charge of said capacitor of said timing network in response to the discharge of the main capacitor and for controlling the operation of said converter temporarily, whereby voltage drop of said direct current power source is made less by making a current flowing to said con-verter decrease when said second load operates and during time said switching element activates.
2. A power supply arrangement for an optical apparatus as claimed in claim 1 wherein said direct current power source circuit comprises said battery and a power source switch con-nected to said battery in series relationship.
3. A power supply arrangement for an optical apparatus as claimed in claim 1 wherein said converter circuit further includes an oscillating transformer having at least two wind-ings.
4. A power supply arrangement for an optical apparatus as claimed in claim 3 wherein said converter comprises an oscillating control switch, an operation stabilizing capacitor, and an oscillation starting circuit.
5. A power supply arrangement for an optical apparatus as claimed in claim 4 wherein said oscillating switch element is a silicon transistor in which a collector electrode is connected to the primary winding of said oscillating trans-former and a base electrode is connected to the third winding.
6. A power supply arrangement for an optical apparatus as claimed in claim 1 wherein said oscillation control circuit is provided between a base electrode and an emitter electrode of an oscillating switch element of said converter.
7. A power supply arrangement for an optical apparatus as claimed in claim 5 wherein said control switching element comprises a second transistor and wherein collector-emitter path of said second transistor is connected in parallel to the base-emitter path of the silicon transistor, said capacitor of said timing network having one terminal connected to a base electrode of said second transistor, said arrangement further including a charging resistor connected between said capacitor of said timing network and the main capacitor.
8. A power supply arrangement for a flash device com-prising a direct current power source, a converter for converting a direct current voltage from said direct current power source to an alternating current voltage, a rectifier for rectifying said alternating current voltage, a main capacitor arranged to be charged by way of the rectifier, a first load, a trigger signal generator for initiating the discharge of the main capacitor into the first load, a second load connected to said current power source, a control circuit including a control switching element connected to said con-verter and a capacitative-resistive timing network, the capacitor of said timing network being arranged to be charged as the main capacitor is charged, and means for activating said control switching element of the control circuit by discharging electric charge of said capacitor of said timing network in response to actuation of means for activating said trigger signal generator and for controlling the operation of said converter temporarily, whereby voltage drop of said direct current power source is made less by making a current flowing to said converter decrease when said second load operates and during time said switching element activates.
9. A power supply arrangement for an optical apparatus as claimed in claim 7 wherein said capacitor of said timing network is connected between the base electrode of said silicon transistor and a triggering capacitor of the trigger signal generating circuit by way of charging resistor.
10. A power supply arrangement for an optical apparatus as claimed in claim 8 wherein said direct current power source circuit comprises said battery and a power source switch con-nected to said battery in series relationship.
11. A power supply arrangement for an optical apparatus as claimed in claim 8 wherein said converter further includes an oscillating transformer having at least two winding.
12. A power supply arrangement for an optical apparatus as claimed in claim 11 wherein said converter comprises an oscillating control switch, an operation stabilizing capaci-tor, and an oscillation starting circuit.
13 A power supply arrangement for an optical apparatus as claimed in claim 12 and including a third winding, wherein said oscillating switch element is a silicon transistor in which a collector electrode is connected to the primary winding of said oscillating transformer and a base electrode is connected to the third winding.
14. A power supply arrangement for a flash device comprising a direct current power source circuit including a battery for providing a direct current voltage, a converter circuit for converting said direct current voltage from said direct current power source circuit to an alternating current voltage, said converter circuit including an oscillator circuit, a rectifier circuit for rectifying said alternating current voltage, a charging circuit for storing electric charge and for supplying electrical energy to a flash tube circuit, said charging circuit including a main storage capacitor, a first load circuit including a trigger signal generating circuit and a flash tube of the flash tube circuit, an oscillation control circuit including a voltage detection circuit for detecting that a voltage of said main storage capacitor of said charging circuit becomes a predetermined value, an oscillation stop timing performing circuit for performing repetition of on and off of said converter circuit, said oscillator circuit of said converter circuit including an oscillation switch element functioning as a high value resistor when the oscillating operation of said oscillator circuit ceases, and a bias control switch element for control-ling on and off operations of said oscillation switching element, said oscillation control circuit including a voltage detecting element for detecting that the voltage of said main storage circuit of the charging circuit becomes the predeter-mined value and for controlling said bias control switch element of the oscillator circuit.
15. A power supply arrangement for an optical apparatus as claimed in claim 14 wherein said bias control switch element is in the form of a switching control transistor and a biasing resistor for biasing said switching control transistor.
16. A power supply arrangement for an optical apparatus as claimed in claim 14 wherein said oscillator circuit com-prises an oscillating switch element, said oscillating switch element being a silicon transistor in which a collector electrode is connected to the primary winding of said oscillating transformer and an emitter electrode is connected to the battery.
17. A power supply arrangement for an optical apparatus as claimed is claim 16 wherein a collector-emitter path of the switching control transistor is connected in parallel to a base circuit of said silicon transistor.
18. A power supply arrangement for an optical apparatus as claimed in claim 15 and further including a voltage detecting element comprising a voltage constant element connected to the base electrode of said switching control transistor and a juncture of a diode of the rectifier circuit and the main storage capacitor of the charging circuit by way of a charging resistor.
19. A power supply arrangement for an optical apparatus as claimed in claim 15 wherein said oscillation stop timing adjusting circuit comprises a voltage dividing variable resistor connected in parallel with respect to the main storage capacitor by way of the charging resistor.
20. A power supply arrangement for an optical apparatus as claimed in claim 1, 8 or 14 wherein a second load circuit is connected to said direct current power source circuit by way of a driving switch.
21. A power supply arrangement for an optical apparatus as claimed in claim 1, 8 or 14 wherein a second load circuit is connected to said direct current power source circuit by way of a driving switch and wherein said driving switch is operable in response to the flash of a flash tube of the first load circuit.
22. A power supply arrangement for an optical apparatus as claimed in claim 1, 8 or 14 wherein a second load circuit is connected to said direct current power source circuit by way of a driving switch and wherein said driving switch is operable in response to the flash of a flash tube of the first load circuit and wherein said driving switch is operated in synchronizing with a camera shutter.
23. A power supply arrangement for an optical apparatus as claimed in claim 1, 8 or 14 wherein a second load circuit is connected to said direct current power source circuit by way of a driving switch and wherein said second load circuit is a data recording device which comprises an illuminating lamp which is connected to the direct current power source circuit.
24. A power supply arrangement for an optical apparatus as claimed in claim 1, 8 or 14 wherein a second load circuit is connected to said direct current power source circuit by way of a driving switch and wherein said second load circuit is a data recording device which comprises an illuminating lamp which is connected to the direct current power source circuit and wherein said data recording device further in-cludes a data plate provided at the front of said illuminating lamp, a focusing lens positioned between said data plate and a film.
25. A power supply arrangement for an optical apparatus as claimed in claim 1, 8 or 14 wherein a second load circuit is connected to said direct current power source circuit by way of a driving switch and wherein said second load circuit includes a motor driving device.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31505/1978 | 1978-03-19 | ||
| JP3150578A JPS54124570A (en) | 1978-03-19 | 1978-03-19 | Oscillation controller of flashing apparatus |
| JP5876678A JPS54150867A (en) | 1978-05-19 | 1978-05-19 | Oscillation controller of flashing apparatus |
| JP58766/1978 | 1978-05-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1164521A true CA1164521A (en) | 1984-03-27 |
Family
ID=26369983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000323321A Expired CA1164521A (en) | 1978-03-19 | 1979-03-13 | Power supply arrangement for an optical apparatus |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1164521A (en) |
| DE (1) | DE2910475A1 (en) |
| FR (1) | FR2420895A1 (en) |
| GB (2) | GB2079074B (en) |
| NL (1) | NL7902121A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8410519D0 (en) * | 1984-04-25 | 1984-05-31 | Ici Plc | Spraying apparatus |
-
1979
- 1979-03-13 CA CA000323321A patent/CA1164521A/en not_active Expired
- 1979-03-16 DE DE19792910475 patent/DE2910475A1/en not_active Ceased
- 1979-03-16 NL NL7902121A patent/NL7902121A/en not_active Application Discontinuation
- 1979-03-16 FR FR7906779A patent/FR2420895A1/en active Granted
- 1979-03-16 GB GB8115205A patent/GB2079074B/en not_active Expired
- 1979-03-16 GB GB7909360A patent/GB2020443B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2079074A (en) | 1982-01-13 |
| GB2079074B (en) | 1983-04-13 |
| GB2020443B (en) | 1982-08-18 |
| DE2910475A1 (en) | 1979-09-20 |
| GB2020443A (en) | 1979-11-14 |
| FR2420895B3 (en) | 1982-01-15 |
| FR2420895A1 (en) | 1979-10-19 |
| NL7902121A (en) | 1979-09-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |