US3692995A - Arrangement for providing a series of illuminations - Google Patents

Arrangement for providing a series of illuminations Download PDF

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Publication number
US3692995A
US3692995A US79813A US3692995DA US3692995A US 3692995 A US3692995 A US 3692995A US 79813 A US79813 A US 79813A US 3692995D A US3692995D A US 3692995DA US 3692995 A US3692995 A US 3692995A
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US
United States
Prior art keywords
photoflash
bulb
series
fuse
arrangement
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
US79813A
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English (en)
Inventor
Karl Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert AG
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Agfa Gevaert AG
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Filing date
Publication date
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/04—Combinations of cameras with non-electronic flash apparatus; Non-electronic flash units
    • G03B15/0452—Electrical ignition means connected to the shutter
    • G03B15/0457—Ignition mechanisms for sequential ignition of flash lamps
    • 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 an arrangement for providing a series of illuminations, the arrangement comprising a plurality of consecutive photoflash units.
  • An object of the invention is an arrangement for providing a series of illuminations, the arrangement insuring in a simple manner that the photoflash bulbs are set off in the correct order.
  • Another object of the invention is the arrangement of the preceding object that is reliable in operation and inexpensive to manufacture.
  • the invention consists essentially of a plurality of consecutive photoflash units, each including in series fuse means and a photoflash bulb having a high internal resistance before, and a low internal resistance after, flashing, the fuse means opening when the corresponding bulb flashes, and circuit means connecting at least the photoflash bulb of each subsequent photoflash unit in parallel with the fuse means of the preceding photoflash unit.
  • FIG. 1 is a circuit diagram of a first embodiment of the invention.
  • FIG. 2 is a circuit diagram of a second embodiment of the invention.
  • a source of current 1 is connected in series with a resistor 2, which is connected to a capacitor 3 that is charged by the source 1.
  • a synchronous switch 4 connects the capacitor 3 to an arrangement 5 for producing a series of illumination, such as photoflashes, for taking pictures.
  • This unit comprises three photoflash bulbs 6, 7 and 8. Connected in series with each of these bulbs is a respective fuse 9, 10, or 11.
  • the photoflash bulb 7 and its fuse are connected in parallel with the fuse 9, and the photoflash bulb 8 with its fuse l l is connected in parallel with the fuse 10.
  • the other terminals of the fuses 9, l0 and 11 are connected in common to the positive plate of the capacitor 3.
  • a test switch 12 connects the negative plate of the capacitor 3 to a test lamp .13, the other terminal of which is connected to the junction between the photoflash bulb 8 and its fuse l l.
  • the arrangement 5 just described operates in the following manner.
  • the capacitor 3 which has been previously charged through the resistor 2, discharges through the photoflash bulb 6 and its fuse 9.
  • the photoflash lamps used have the property that their internal resistance is very high before they are flashed and very low afterwards, owing, for example, to the fact that the electrodes melt together. After the lamp 6 has flashed, the
  • the user wants to determine whether or not at least the last photoflash bulb 8 is good, he closes the test switch 12. If the bulb 8 is good, the fuse 11 will be intact; and the test lamp 13 will illuminate.
  • the capacitor 3 discharges through the two burned-out photoflash bulbs 6 and 7, and through the good photoflash bulb 8 and its fuse 11.
  • test switch 12 If the test switch 12 is now closed, the test lamp 13 will not illuminate, because the current path through the fuse 11 is broken. The user of the arrangement therefore knows that all of the photoflash bulbs are used up.
  • test lamp 13 can also be connected in parallel with the fuse 11, in which case the lamp lights only if the fuse 11 is open, indicating that the photoflash bulb 8 is burned out.
  • the invention insures, in a very simple manner, that once the respective photoflash bulb is used, the current path of the corresponding fuse is interrupted, thereby removing the short circuit across the following series connected photoflash bulb and fuse. Moreover, since the internal resistance of a photoflash bulb is low after flashing, the following bulb can be flashed by pressing the synchronous switch.
  • a further advantage of the invention is that the flash bulbs used have only two connections and are simply designed, enabling the bulbs to be manufactured inexpensively.
  • Another advantage of the invention is that the arrangement 5 has no switching contacts, since the individual components are always conductively connected together.
  • a source of current 14 is connected in series to a resistor 15, which latter is connected to a capacitor 16 charged by the source 14.
  • the junction between the resistor l5 and the negative plate of the capacitor 16 is connected to a synchronous switch 17.
  • the arrangement 18 for producing a series of illuminations comprises four photoflash bulbs 19,20,21 and 22, which are series connected with respective fuses 23,24,25 and 26.
  • the photoflash bulb 20 is shunted across the fuse 23, the bulb 21 across the fuse 24, and the bulb 22 across the fuse 25. All of their parallel circuits, each comprised of a photoflash bulb and the fuse of the preceding photoflash bulb, together form a series circuit.
  • test circuit composed of a test voltage source 27, a test switch 28, and a test lamp 29, all connected in series.
  • the embodiment described operates in the following manner.
  • the capacitor 16 is charged through the resistor to the full voltage of the source 14.
  • the switch 17 When the switch 17 is closed, the capacitor 16 discharges through the photoflash bulb l9, and through the fuses 23,24 and 25.
  • the bulbs 20, 21 and 22 do not flash, because they are shunted by the respective fuses 23,24 and 25.
  • the heat developed by the flash of the bulb 19 melts the fuse 23, so that the short across the bulb is interrupted.
  • the internal resistance of the used bulb 19 is low.
  • the synchronous switch 17 can again be closed. If the switch 17 is closed, the capacitor 16 discharges through the used, low resistance, bulb 19, and through the high resistance bulb 20, as well as through the fuses 24 and 25. After the bulb 20 has flashed, the fuse 24 is melted; and the short across the bulb 21 is broken.
  • test lamp 29 will illuminate, because the current path through the fuse 26 is still closed.
  • Closing the synchronous switch 17 again, causes the capacitor 16 to discharge through the used, low resistance, bulbs 19 and 20, and through the unused, relatively high resistance, bulb 21 and through the fuse 25. After bulb 21 is flashed, the fuse 25 is open; and the bulb 22 is ready to be flashed. If the synchronous switch 17 is again closed, the bulb 22 flashes; and the fuse 26 melts, opening the current path of the test circuit. Now, the test lamp does not illuminate when the test switch 28 is closed, so that the user knows that all of the flash bulbs are used up.
  • the test lamp 29 can also be connected in parallel with the source 27 and the fuse 26. In this embodiment, the lamp 29 lights only if the fuse 26 is open, thereby indicating that all of the bulbs have been used.
  • the fuses can be either an integral part of the photoflash bulbs, or a component positioned outside of, and sufficiently near to, the respective flash bulbs so that the corresponding fuse melts when the bulb flashes.
  • each said fuse means is located in the immediate vicinity of a respective said photoflash bulb, so that the heat of the bulb melts and opens the respective fuse means.
  • a plurality of consecutive photoflash units each including in series fuse means and a photoflash bulb having a high internal resistance before, and a low internal resistance after flashing, said fuse means opening when the corresponding said bulb flashes; circuit means connecting at least the photoflash bulb of each subsequent photoflash unit in parallel with the fuse means of the preceding photoflash unit; a test circuit for determining whether there are any unused photoflash bulbs; and a switch for connecting said test circuit to the last of said photoflash units, said test circuit including a lamp connected to said fuse means of the last of said photoflash units to indicate, when said switch is closed, whether said fuse means is open or closed, and further including current source means for energizing said lamp.
  • a plurality of consecutive photoflash units each including in series fuse means and a photoflash bulb having a high internal resistance before, and a low internal resistance after flashing, said fuse means opening when the corresponding said bulb flashes; circuit means connecting at least the photoflash bulb of each subsequent photoflash unit in parallel with the fuse means of the preceding photoflash unit; a test circuit for determining whether there are any unused photoflash bulbs; and a switch for connecting said test circuit to the last of said photoflash units including a source of electric current, and
  • photoflash bulb of the last of said units has one side directly connected to one pole of said source.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Facsimile Heads (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
US79813A 1969-10-16 1970-10-12 Arrangement for providing a series of illuminations Expired - Lifetime US3692995A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691952049 DE1952049A1 (de) 1969-10-16 1969-10-16 Mehrfachblitzeinrichtung

Publications (1)

Publication Number Publication Date
US3692995A true US3692995A (en) 1972-09-19

Family

ID=5748316

Family Applications (1)

Application Number Title Priority Date Filing Date
US79813A Expired - Lifetime US3692995A (en) 1969-10-16 1970-10-12 Arrangement for providing a series of illuminations

Country Status (5)

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US (1) US3692995A (de)
CH (1) CH535528A (de)
DE (1) DE1952049A1 (de)
FR (1) FR2066032A5 (de)
GB (1) GB1326226A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918884A (en) * 1973-05-01 1975-11-11 Philips Corp Arrangement provided with some combustion flash bulbs
JPS5198018A (en) * 1975-02-25 1976-08-28 Satsueisocho senkoroshutsushisutemu
JPS51127723A (en) * 1975-04-14 1976-11-08 Gen Electric Flash lamp shorting fuse material and flash lamp using same
JPS51150328A (en) * 1975-06-05 1976-12-23 Philips Nv Flash unit
JPS5237427A (en) * 1975-09-17 1977-03-23 Gte Sylvania Inc Multiple lamp flashing unit having radiation energy activating high speed breaking switch
US4040777A (en) * 1975-04-28 1977-08-09 General Electric Company Flash lamp array having shorting lamps
US4048487A (en) * 1976-09-08 1977-09-13 General Electric Company Last-flash indicator switch in photoflash array
US4064431A (en) * 1976-07-06 1977-12-20 General Electric Company Last-flash indicator for photoflash array
JPS5352418A (en) * 1976-10-19 1978-05-12 Gen Electric Flash lamp array
US4093979A (en) * 1976-08-04 1978-06-06 General Electric Company Multiple flash array
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4158879A (en) * 1976-07-26 1979-06-19 Polaroid Corporation Flip flash having final flash signal
US4329140A (en) * 1979-07-19 1982-05-11 Polaroid Corporation Multiple flash arrangement with redundant fuse arrangement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976511A (en) * 1958-09-22 1961-03-21 Kalimar Inc Photographic flash guns
US3532931A (en) * 1968-12-16 1970-10-06 Gen Electric Photoflash assembly for sequentially flashing lamps utilizing voltage and current responsive devices
US3562508A (en) * 1966-02-18 1971-02-09 Agfa Gevaert Ag Flash unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976511A (en) * 1958-09-22 1961-03-21 Kalimar Inc Photographic flash guns
US3562508A (en) * 1966-02-18 1971-02-09 Agfa Gevaert Ag Flash unit
US3532931A (en) * 1968-12-16 1970-10-06 Gen Electric Photoflash assembly for sequentially flashing lamps utilizing voltage and current responsive devices

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918884A (en) * 1973-05-01 1975-11-11 Philips Corp Arrangement provided with some combustion flash bulbs
JPS5198018A (en) * 1975-02-25 1976-08-28 Satsueisocho senkoroshutsushisutemu
JPS51127723A (en) * 1975-04-14 1976-11-08 Gen Electric Flash lamp shorting fuse material and flash lamp using same
US4040777A (en) * 1975-04-28 1977-08-09 General Electric Company Flash lamp array having shorting lamps
JPS51150328A (en) * 1975-06-05 1976-12-23 Philips Nv Flash unit
US4087724A (en) * 1975-06-05 1978-05-02 U.S. Philips Corporation Flash array provided with at least two combustion flash lamps
JPS5237427A (en) * 1975-09-17 1977-03-23 Gte Sylvania Inc Multiple lamp flashing unit having radiation energy activating high speed breaking switch
US4064431A (en) * 1976-07-06 1977-12-20 General Electric Company Last-flash indicator for photoflash array
US4158879A (en) * 1976-07-26 1979-06-19 Polaroid Corporation Flip flash having final flash signal
US4093979A (en) * 1976-08-04 1978-06-06 General Electric Company Multiple flash array
US4048487A (en) * 1976-09-08 1977-09-13 General Electric Company Last-flash indicator switch in photoflash array
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
JPS5352418A (en) * 1976-10-19 1978-05-12 Gen Electric Flash lamp array
US4329140A (en) * 1979-07-19 1982-05-11 Polaroid Corporation Multiple flash arrangement with redundant fuse arrangement

Also Published As

Publication number Publication date
FR2066032A5 (de) 1971-08-06
CH535528A (de) 1973-03-31
DE1952049A1 (de) 1971-04-29
GB1326226A (en) 1973-08-08

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