EP0240789B1 - Dispositif d'éclairage et de flash - Google Patents

Dispositif d'éclairage et de flash Download PDF

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Publication number
EP0240789B1
EP0240789B1 EP87103920A EP87103920A EP0240789B1 EP 0240789 B1 EP0240789 B1 EP 0240789B1 EP 87103920 A EP87103920 A EP 87103920A EP 87103920 A EP87103920 A EP 87103920A EP 0240789 B1 EP0240789 B1 EP 0240789B1
Authority
EP
European Patent Office
Prior art keywords
flash
light
control
energy store
time control
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 - Lifetime
Application number
EP87103920A
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German (de)
English (en)
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EP0240789A1 (fr
Inventor
Urs Zeltner
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Individual
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Individual
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Publication date
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Priority to AT87103920T priority Critical patent/ATE64807T1/de
Publication of EP0240789A1 publication Critical patent/EP0240789A1/fr
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Publication of EP0240789B1 publication Critical patent/EP0240789B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a lamp or flash device according to the preamble of claim 1.
  • Different amounts of light can be emitted with the luminaire or flash device.
  • the energy store of such devices has a number of lightning capacitors. Depending on the amount of light to be emitted, the corresponding flash capacitors are switched on or off. The flash capacitors in operation are always charged to the same voltage, so that the color temperature of the resulting flash remains essentially independent of the selected energy.
  • these devices have the disadvantage that the flash energy can only be set in relatively large steps, because the amount of light can only be changed by switching on or off the flash capacitors. Such devices are not suitable for complex and highly precise recordings.
  • the electrolytic capacitors are charged to different voltages. If a large amount of light is to be emitted, the flash capacitors are charged to a very high voltage value with the amplitude control, while, conversely, the capacitors are charged to a correspondingly small voltage value if only a little amount of light is required. In this way, the amount of light to be emitted can be set very precisely on the device.
  • this device has the disadvantage that the color temperature of the light emitted by the flash tube changes due to the different voltages of the electrolytic capacitors depending on the amount of light. Therefore, the amount of light can not be varied arbitrarily if attention must be paid to an accurate color temperature of the light to be emitted.
  • the invention has for its object to design the generic light or flash device so that the color temperature of the light emitted by the flash tube can be influenced in a targeted manner while maintaining a very fine adjustment of the amount of light and can preferably be kept constant regardless of the amount of light emitted.
  • the amplitude control and the time control work together in such a way that when the quantity of light is emitted, the desired color temperature is obtained. If the flash energy is reduced by charging the energy store to a low value, there is a color shift in the direction of lower, ie warmer color temperatures. This color shift is counteracted by the time control in the device according to the invention. With it, the flash duration is shortened at the same time, which results in a color shift in the direction of higher, ie colder color temperatures. By a suitable choice of the charging voltage, ie the amplitude and the flash duration, the desired color temperature can thus be set for a given quantity of light.
  • the device according to the invention it is thus possible in a very simple manner to keep the color temperature constant, for example, by suitable selection of the reduction and reduction in a large setting range.
  • the device according to the invention can therefore be used to produce recordings which are distinguished by an optimal color temperature.
  • the color temperature can not only be kept constant over a wide setting range, but can also be set to a specific value.
  • the power supply part ie the generator part, and the lamp are combined to form one structural unit.
  • the amplitude and the time control are already built in, so that the user of this unit has a universal device at hand with which he can cope with all recording situations.
  • the amplitude control and the time control can either be provided in the generator part or both in the lamp.
  • the amplitude control and the time control can also be accommodated in the generator part and in the lamp.
  • the time control and the amplitude control can also be provided together in one accessory, which is then used for devices that have no control.
  • the device it is possible to influence the color temperature in flash devices, the flash energy of which can preferably be adjusted, preferably to keep it constant.
  • the flash energy is varied.
  • two methods are used in combination with one another, so that the color temperature can be influenced or kept constant in the desired manner.
  • the flash unit has at least one, preferably a plurality of energy stores, which are preferably electrolytic capacitors. All electrolytic capacitors are available for operating the flash unit, regardless of the selected power. The variation of the flash energy is achieved in that the electrolytic capacitors are charged at different levels depending on the energy required.
  • Fig. 1 shows the case that the electrolytic capacitors are charged to a high value I1 and to a low value I2. From the time of ignition t O , the voltage decreases with time. The area under the respective curve I or II corresponds to the amount of light that can be emitted by the flash unit.
  • the amount of light can be adjusted very finely.
  • the color temperature of the flash light changes as a result of the different charging voltages, so that the range of variation cannot be increased arbitrarily if high color accuracy or exact color temperatures are important.
  • the charging voltage drops, the color is distorted in the direction of lower color temperatures, ie the light has a more or less strong red cast depending on the voltage drop selected.
  • the charging voltage can therefore only be varied to a limited extent.
  • the flash energy can also be varied by limiting the flash duration.
  • Fig. 2 shows the corresponding It diagram. All energy storage devices are charged to a certain level I 1. With this method, all energy stores are in operation regardless of the selected voltage. The amount of light to be emitted is varied in that the discharge is interrupted after a certain time t 1 after the ignition time t o . The amount of light emitted differs depending on the switch-off time t1. The amount of light emitted corresponds to the area under the It curve up to the switch-off time t1. In Fig. 2, this area is identified by hatching. With this method, too, the amount of light to be emitted can be set very finely. In this case, the color temperature of the resulting flash light depends on the switch-off time. If the flash energy to be emitted is reduced by setting the switch-off time t1 very early, the color of the flash light produced tends to be higher Color temperatures, ie the flash has a more or less strong blue cast.
  • the flash energy to be emitted can be set very precisely with both methods, but that when the charging voltage is varied downward, the resulting flash light in the direction of a lower color temperature and when the switch-off time is varied in the direction t0 higher color temperatures is shifted. With regard to the color temperature of the resulting flash, two opposing effects occur. With the device according to the invention, these two types of variation are now combined with one another. If the amount of light to be emitted is to be reduced, the charging voltage is reduced and the length of the flash is also shortened.
  • the desired color temperature can thus be generated by a suitable choice of lowering the charging voltage and shortening the flash duration.
  • the color temperature can thus be kept constant, for example, in a large setting range, so that the color temperature is always the same regardless of the quantity of light emitted. It is also possible to deliberately shift the color temperature towards lower or higher color temperatures by selecting the appropriate charging voltage and flash duration. Because the charging voltage and the flash duration can be set very sensitively, the desired color temperature can be set very precisely with the device. By simultaneously setting the charging voltage and the flash duration on the device, any desired color temperature can be set within a certain range under the most varied shooting conditions.
  • Fig. 5 shows two curves with different charging voltage and flash duration.
  • the areas A1 and A2 under both curves contain the same energy content or amount of light.
  • the color temperature is increased by increasing the charging voltage. The same happens through the early switch-off time tl. Both factors influence the color towards blue.
  • the color temperature is influenced in the red direction by lowering the charging voltage and switching it off later (t2). With this device, unwanted color shifts can be corrected.
  • the switch-off time tl either specifying the time immediately, selecting the level of the current or the level of the voltage. In all cases, the switch-off time can be set exactly.
  • a so-called asymmetrical light distribution is also possible with several lights connected to one generator. It is known to have multiple lights or flash units on one generator to connect. In appropriate shooting situations, for example, one of the lights or flash units serves as the main light and the other lights as the secondary light. However, all lights connected to the generator receive the same energy, so that the secondary light is too strong compared to the main light. If lights or flash units are used for the secondary light, which contain the combined amplitude and time control, then the lights forming the secondary light can be switched off by specifying the switch-off time before the entire charge of the energy store has drained off.
  • the full charge of the energy stores flows off, while in the other luminaire (s) only part of the charge flows off, ie less light is emitted.
  • a variable asymmetrical illumination can thus be achieved with a generator, which is normally only intended for symmetrical illumination, in which all the luminaires connected to it emit the same amount of light, by shifting the switch-off time.
  • the device it is also possible to fire the lights forming the secondary light with a delay compared to the main light in shooting situations with several lights or flash units.
  • the secondary light can not only be switched off before it is fully discharged, but can also be ignited later will.
  • a variable asymmetrical light distribution is also possible in this way. Due to the later ignition and early switching off, part of the blue and red color components are removed from the flash so that the color composition and thus the color temperature of the flash can be precisely controlled by selecting the ignition point and the switch-off point.
  • the color temperature can also be varied by selecting the switch-off point in such a way that the same amount of light results for a given charging voltage (areas A1 and A2 in FIG. 5 are the same).
  • the blue color component predominates in variant A1, while the red color component predominates in variant A2.
  • the flash duration for the quantity of light A1 to be emitted is, as shown in FIG. 5, considerably shorter than the flash duration which is necessary for emitting the same quantity of light A2.
  • motion sequences can be displayed either in focus or out of focus.
  • Cameras which have a built-in sensor for computer flash units. As soon as the computer flash unit has emitted sufficient light, a signal is derived depending on the film sensitivity set on the camera in order to switch off the computer flash unit.
  • This camera-side device can also be used for lighting or.
  • Flash units with the described combination control can be used. In this case, the device is connected to the corresponding camera input. As soon as the device has emitted a certain amount of light, the switch-off signal is emitted by the camera and the device is switched off.
  • the device with the combination control described is usually intended for studios and has an output of the order of 6000 Wsec, for example.
  • the usual computer flash units used in cameras have powers in the order of about 100 Wsec. up to a maximum of about 200 Wsec.
  • the combination control can thus be used both for low-power flash units (so-called computer flash units for amateurs and reporters) and for studio flash units with high to very high output.
  • the flash tube is ignited at the time t0. At time t3 is switched off. At a freely definable time t4 the flash tube is fired again and turned off again after the time t5. At time t6 is ignited again and switched off again at time t7. In this way, the energy storage of the lights or. of the flash unit can be discharged gradually.
  • the switch-off times can be selected so that the smaller amounts of light emitted in each case are exactly the same. A stroboscopic effect can thus be achieved in a simple manner (dash-dotted line in FIG. 2).
  • the charging unit is independent of the flash device, i.e. can charge even during the flash process, there is the possibility of constantly adding new energy in stroboscopic mode. As a result, the energy store is emptied less quickly in stroboscopic mode, which permits a longer flash sequence.
  • the light or the flash unit with the combination control is a universal device with which the most varied of recording problems can be easily solved.
  • Fig. 3 shows a circuit for keeping the color temperature constant. It has a charging unit 1 with an amplitude control. In addition to the charging part 1, the device has an energy store 2, a time control 3 and a flash device 4.
  • the charging part 1 has an AC power supply U, which is followed by a capacitor C1 and a diode D1. Between the capacitor C1 and the diode D1 there is a second diode D2, which is between a switch T3 and the diode D1.
  • the electronic switch T3 is, for example, a triac with which the charging part 1 can be switched on and off.
  • the capacitor C1 and the diodes D1 and D2 act as voltage doublers.
  • the energy store 2 has at least one capacitor for storing the lightning energy. Electrolytic capacitors are preferably used as energy stores.
  • the energy store C2 is charged with the charging part 1.
  • the switch T3 of the charging part 1 is switched on operated a regulator circuit R.
  • the regulator circuit R measures the instantaneous voltage across the capacitor C2 and switches on the switch T3 as long as it is below a predetermined, adjustable value. If the capacitor C2 has the desired voltage, the switch T3 is switched off by the regulator circuit.
  • the timing controller 3 has a delay circuit V, with which a valve T2, which is for example a thyristor, is actuated.
  • the electrical valve T2 is ignited at the time of switching off and generates a negative voltage peak at a further electrical valve T1, which is a thyristor, for example.
  • the electrical valve T1 is switched on at the moment of the lightning ignition and blocked again at the time of switching off by applying a negative voltage peak by a capacitor C3.
  • the timer 3 also has an ignition circuit Z, which generates a voltage peak at the moment of the flash triggering, which ignites a flash tube RO via an ignition transformer Tr.
  • the ignition circuit Z ignites the electrical valve T1 via a limiting resistor 5.
  • the delay circuit V is started with the ignition circuit Z via a further limiting resistor 6.
  • an inductance L preferably a coil
  • the energy store C2 With the charging part 1, the energy store C2 is always charged, so that the desired energy is available at the time of ignition.
  • the regulator circuit R always measures the instantaneous voltage at the energy store C2 and switches on the valve T3 when the measured one Voltage is below the adjustable value.
  • the ignition circuit Z When the flash is triggered, the ignition circuit Z generates a voltage spike which ignites the flash tube RO via the ignition transformer Tr.
  • the ignition transformer Tr generates a corresponding high voltage pulse.
  • the valve T1 is ignited via the ignition circuit Z and the delay circuit V is started.
  • the discharge current can flow from the capacitor C2 via the line 7 to the flash tube RO and from there via the open valve T1 to the capacitor C2.
  • the delay circuit V set in motion by the ignition circuit Z emits a signal to interrupt the flash discharge to the valve T2 after an adjustable time. It is therefore ignited at the time of the switch-off and a negative voltage peak is generated at the valve T1 via the inductance L and the switch-off capacitor C3. Since the valve T2 is opened via the delay circuit V, the discharge current can flow back to the energy store C2 via the flash tube RO, the turn-off capacitor C3, the inductance L and the valve T2. When the negative voltage peak is applied, the valve T1 is blocked again by the cut-off capacitor C3. When the turn-off capacitor C3 is charged to the instantaneous value of the lightning voltage, the switch T2 is blocked and the lightning discharge is thereby completed.
  • the timing controller 3 has a comparator K which detects the current Voltage on energy storage C2 monitored. As soon as this voltage drops below a set value, the comparator K sends a shutdown signal to the valve T2 and blocks it. Otherwise, this embodiment works the same as the previously described embodiment.
  • the ignition circuit Z At the moment of the flash triggering, the ignition circuit Z generates a voltage spike through which the flash tube RO is ignited via the ignition transformer Tr. In addition, valve T1 is ignited by ignition circuit Z via limiting resistor 5.
  • the discharge current can then flow back from energy store C2 via line 7 to flash tube RO and from there via valve T1 to energy store C2.
  • the comparator K compares the instantaneous voltage at the energy store C2 with a preset value. As soon as the value falls below this predefined value, the comparator K generates a switch-off signal which ignites the valve T2. As a result, a negative voltage peak is generated at the valve T1 via the inductance L and the turn-off capacitor C3, as a result of which the valve is blocked. As soon as the cut-off capacitor C3 is charged again to the instantaneous value of the lightning voltage, the valve T2 is blocked and thus the lightning discharge is completed.
  • the described lighting or Flash units consist of the charging unit 1, the energy store 2, the time control 3 and the flash device 4 with the flash tube RO.
  • an amplitude control (not shown) is provided, which is known per se and with which, as has been explained with reference to FIG. 1, the energy store can optionally be charged to different voltages.
  • the charging part 1, the energy store 2, the time control 3, the amplitude control and the flash device 4 housed in a single device, which is preferably designed as a compact device.
  • the owner of such a compact device thus has all the possible variations that have been explained in detail above, except for the asymmetrical power distribution.
  • the flash device 4 can be accommodated in a separate lamp, while the other components, namely the charging part 1, the energy store 2, the timing control 3 and the amplitude control, can be accommodated in a generator part.
  • the time control 3 and the amplitude control are combined in the flash device 4 and are part of the lamp.
  • the charging part 1 and the energy store 2 are accommodated in the generator.
  • the charging part 1, the energy store 2 and the time control 3 or the amplitude control are accommodated in the generator, while the flash device 4 and the other part of the control are provided in the lamp.
  • An embodiment is also possible in which the charging part 1, the energy store 2 and the time control 3 or the amplitude control are in turn accommodated in the generator.
  • the respective other control part that is to say the amplitude control or the time control 3, are accommodated in an accessory device.
  • the flash device 4 is then a separate component.
  • the user can subsequently purchase the accessory with the time control or with the amplitude control and thus perfect its setup.
  • the charging part 1 and the energy store 2 are in turn accommodated in the generator.
  • the time control 3 or the amplitude control can in turn be accommodated in an accessory.
  • the other control part, which is not provided in the accessory part, is then located in the lamp which also contains the flash device 4.
  • Another embodiment consists in that a generator operated with a plurality of lights is equipped with one or more time-out devices and controls the connected lights independently of one another.
  • the operation of the control of the amplitude and / or the flash duration can take place both directly on the flash unit (generator or its lamp) as well as in the form of a remote control via cable, infrared, radio or ultrasonic pulse.

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Claims (15)

  1. Dispositif d'éclairage et respectivement d'éclair, comprenant un groupe-chargeur, au moins un accumulateur d'énergie, une commande d'amplitude par laquelle l'accumulateur d'énergie peut être chargé à des tensions différentes, et au moins un tube flash, caractérisé en ce qu'à la commande d'amplitude est superposée une commande de temps (3) de telle façon que le tube flash (RO) émet, en fonction de l'amplitude réglée et de la durée d'éclair réglée, de la lumière d'une température de couleur prédéterminée.
  2. Dispositif selon la revendication 1, caractérisé en ce que, pour l'obtention d'une température de couleur constante de la lumière à émettre par le tube flash (RO) avec une énergie d'éclair diminuée, la commande d'amplitude permet de réduire la tension de charge de l'accumulateur d'énergie (2) et que la durée de l'éclair peut être raccourcie avec la commande de temps (3).
  3. Dispositif selon l'une des revendications 1 ou 2, comprenant un circuit d'allumage pour l'amorçage du tube flash, caractérisé en ce que le circuit d'allumage (Z) fait partie de la commande de temps (3), et que le circuit d'allumage (Z) permet d'activer un circuit de retard (V).
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que la commande de temps (3) comprend une valve (T1) pouvant être activée par le circuit d'allumage (Z).
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que la commande de temps (3) comprend un condensateur de coupure (C3) permettant de bloquer la valve (T1).
  6. Dispositif selon l'une des revendications 4 ou 5, caractérisé en ce que la valve (T1) est un thyristor.
  7. Dispositif selon l'une des revendications 3 à 6, caractérisé en ce que le circuit de retard (V) commande une seconde valve (T2), de préférence un thyristor.
  8. Dispositif selon l'une des revendications 1, 2 et 4 à 6, caractérisé en ce que la commande de temps (3) comprend un comparateur (K) qui est branché sur l'accumulateur d'énergie (2), compare la tension effective de l'accumulateur d'énergie (2) avec une tension de consigne et génère un signal de coupure dès que la tension effective prend une valeur inférieure à la tension de consigne.
  9. Dispositif selon la revendication 8, caractérisé en ce que la seconde valve (T2) est reliée à la sortie du comparateur (K).
  10. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que le groupe-chargeur (1), l'accumulateur d'énergie (2), la commande de temps (3), la commande d'amplitude et le tube flash (RO) sont logés dans un appareil commun.
  11. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que le groupe-chargeur (1), l'accumulateur d'énergie (2), la commande de temps (3) et la commande d'amplitude sont logés dans un ensemble générateur, alors que le tube flash (RO) est intégré dans une lampe.
  12. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que le groupe-chargeur (1) et l,accumulateur d'énergie (2) sont logés dans l'ensemble générateur et la commande d'amplitude, la commande de temps (3) et le tube flash (RO), dans la lampe.
  13. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que le groupe-chargeur (1), l'accumulateur d'énergie (2), la commande de temps (3) ou la commande d'amplitude sont logés dans l'ensemble générateur et que respectivement l'autre partie de la commande et le tube flash (RO) sont intégrés dans la lampe.
  14. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que la commande d'amplitude et/ou la commande de temps (3) sont logés dans un appareil additionnel.
  15. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que la commande d'amplitude ou la commande de temps (3) est logée, conjointement avec le tube flash (RO), dans la lampe.
EP87103920A 1986-04-11 1987-03-18 Dispositif d'éclairage et de flash Expired - Lifetime EP0240789B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87103920T ATE64807T1 (de) 1986-04-11 1987-03-18 Leuchten-bzw. blitzeinrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863612164 DE3612164A1 (de) 1986-04-11 1986-04-11 Leuchten- bzw. blitzeinrichtung
DE3612164 1986-04-11

Publications (2)

Publication Number Publication Date
EP0240789A1 EP0240789A1 (fr) 1987-10-14
EP0240789B1 true EP0240789B1 (fr) 1991-06-26

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Application Number Title Priority Date Filing Date
EP87103920A Expired - Lifetime EP0240789B1 (fr) 1986-04-11 1987-03-18 Dispositif d'éclairage et de flash

Country Status (7)

Country Link
US (1) US4853600A (fr)
EP (1) EP0240789B1 (fr)
JP (1) JPS62259393A (fr)
AT (1) ATE64807T1 (fr)
CH (1) CH672703A5 (fr)
DE (2) DE3612164A1 (fr)
ES (1) ES2024448B3 (fr)

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JPS58149033A (ja) * 1982-03-02 1983-09-05 Minolta Camera Co Ltd 閃光発光装置
JPS58224339A (ja) * 1982-06-23 1983-12-26 Fuji Koeki Kk グリツプタイプの閃光放電発光器
US4530550A (en) * 1982-09-13 1985-07-23 Olympus Optical Company Ltd. Power supply unit for electronic flash
JPS6068527U (ja) * 1983-10-18 1985-05-15 コメツト株式会社 写真用調光ストロボ回路
US4486086A (en) * 1983-11-23 1984-12-04 Eastman Kodak Company Electronic flash apparatus
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JPS60220322A (ja) * 1984-04-18 1985-11-05 Fuji Photo Film Co Ltd ストロボ装置
US4656397A (en) * 1985-03-04 1987-04-07 Simplec Manufacturing Company, Inc. Method and apparatus for controlling flash tube discharge

Also Published As

Publication number Publication date
DE3612164C2 (fr) 1990-03-08
US4853600A (en) 1989-08-01
CH672703A5 (fr) 1989-12-15
DE3612164A1 (de) 1987-10-15
ES2024448B3 (es) 1992-03-01
JPS62259393A (ja) 1987-11-11
DE3770971D1 (de) 1991-08-01
ATE64807T1 (de) 1991-07-15
EP0240789A1 (fr) 1987-10-14

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