EP0186898A2 - Lampe à éclair rapide - Google Patents

Lampe à éclair rapide Download PDF

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Publication number
EP0186898A2
EP0186898A2 EP85116517A EP85116517A EP0186898A2 EP 0186898 A2 EP0186898 A2 EP 0186898A2 EP 85116517 A EP85116517 A EP 85116517A EP 85116517 A EP85116517 A EP 85116517A EP 0186898 A2 EP0186898 A2 EP 0186898A2
Authority
EP
European Patent Office
Prior art keywords
lamp
envelope
electrodes
combustible
electrically conductive
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.)
Withdrawn
Application number
EP85116517A
Other languages
German (de)
English (en)
Other versions
EP0186898A3 (fr
Inventor
Thomas L. Gavenonis
William H. Hewitt
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.)
Osram Sylvania Inc
Original Assignee
GTE Products Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GTE Products Corp filed Critical GTE Products Corp
Publication of EP0186898A2 publication Critical patent/EP0186898A2/fr
Publication of EP0186898A3 publication Critical patent/EP0186898A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K5/00—Light sources using charges of combustible material, e.g. illuminating flash devices
    • F21K5/02—Light sources using charges of combustible material, e.g. illuminating flash devices ignited in a non-disrupting container, e.g. photo-flash bulb

Definitions

  • This invention is in the field of flash lamps and, more particularly, relates to flash lamps for use in providing photon energy or radiation for pumping lasers and/or for use in photo flash lamps or stroborscopic photography.
  • Photo flash lamps currently comprise in general lamps typically filled with an oxidizer, i.e., a gas that supports combustion such as oxygen and a combustible, such as aluminum-magnesium alloy or aluminum, magnesium or zirconium.
  • oxidizer i.e., a gas that supports combustion such as oxygen
  • combustible such as aluminum-magnesium alloy or aluminum, magnesium or zirconium.
  • Such flash lamps typically comprise hermetically sealed light transmitting glass envelopes which contain a filamentary combustible material, such as shredded aluminum or shredded zirconium foil immersed in a combustion supporting gas, such as oxygen.
  • an electrical ignition system is included within the envelope of the lamp comprising a tungsten filament supported on a pair of lead-in wires having a quantity of ignition paste on the inner ends thereof adjacent to the filament.
  • This type of lamp is operated by the passage of electric current through the lead-in wires.
  • Another type of photo flash lamp comprises the percussive type, such as described in U. S. Patent No. 3,535,063 which includes a mechanically activated primer sealed in one end of the lamp envelope.
  • the ignition system may comprise a metal tube extending from the lamp envelope and a charge of fulminating material on a wire supported in the tube. Operation of the percussive photo flash lamp is initiated by an impact onto the tube to cause deflagration of the fulminating material up through the tube to ignite the combustible disposed in the lamp envelope.
  • Another type of photo flash lamp is the piezo-electric ignited flash lamp in which a high voltage in the neighborhood of 2,000 Volts is produced by a piezo-electric device to cause a spark to be emitted which ignites the combustible material, i.e, the primer within the lamp envelope.
  • This is contrasted with battery ignited- type photo flash lamp which utilizes a relatively high current in the neighborhood of amperes to ignite the combustible.
  • a high voltage, high current capacitive-type ignition system is provided.
  • a transparent envelope encloses a shredded combustible conductively coupled between a pair of electrodes.
  • a capacitor is discharged through the combustible at relatively high voltage and high current to cause rapid simultaneous ignition of substantially all the combustible threads in the envelope. In this fashion, a discharge occurs across the longitudinal gap between the electrodes.
  • the conductive shreds of the combustible form the path of the discharge.
  • a spark occurs at each non-contacting interface of shreds crossing throughout the lamp ignite resulting in rapid simultaneous ignition of the combustible and consequent low "peak time"; i.e., time between ignition and peak actinic output.
  • a lamp 10 comprising a quartz tube 22 mounted between two brass endplates 12.
  • Three phenolic "stand-off" insulators 20 are spaced 120° apart around the inner periphery of 3 inch square by 3/8 inch thick end plates 12. Screw bolts 18 at each end of the plates hold the insulators 20 and end plates 12 in place. Teflon washers 21 provide a hermetic seal between the end plates 12 and the open ends of quartz tube 22.
  • the tube is filled with shredded zirconium 40 and a gaseous oxidizer, such as oxygen.
  • a high voltage connector 16 is inserted through a hole in washer 21.
  • Connector 16 is provided with a pointed discharge element 30 on the inner or tube side of the connector 16.
  • Oxygen is pumped into tube 22 via tubing 42 which may then be sealed by conventional means.
  • the length of the lamp may very depending upon the desired application. We have made lamps of 3-inch to 4 feet in length. Even in such relatively long lengths, these lamps have operated satisfactorily.
  • the high voltage connector electrode 16 of the lamp 10 is coupled through switch S 1 to side "a" of capacitor 48, as. shown in Fig. 3 when S 1 is in the 2 position.
  • the other electrode end plate 12 is grounded.
  • the "b" side of capacitor 48 is also grounded.
  • switch S 1 is switched to position 1. In this position 0-15 KV volts from D.C. power supply 52 is coupled through two megohm resistors 44 to side "a" of 0.1 to 2 microfarad capacitor 48 for a sufficient time to allow capacitor 48 to fully charge. Upon moving switch S 1 to position 2, the energy stored in capacitor 48 is coupled into the flashlamp 10.
  • the time it takes to achieve peak actinic output from the moment the igniter circuit is energized i.e., the "peak time” can be greatly reduced by increasing the input energy and have thereby achieved actinic pulses of shorter time duration and more rapid "peak time” than heretofore known.
  • the "peak time" for combustible gas reactions such as, zirconium-oxygen reactions can be decreased by increasing the input energy to the reaction system.
  • Part A of Table I shows that "peak time” and FWHM do not change significantly if the energy is held constant but the voltage and capacitance is changed.
  • Part B of Table I shows that with constant C and increased V, the "peak time” decreases.
  • Part C of Table I shows that as voltage is held constant and the capacitance increased, such that the energy input is increased, the "peak time” and FWHM decrease.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Stroboscope Apparatuses (AREA)
EP85116517A 1984-12-31 1985-12-23 Lampe à éclair rapide Withdrawn EP0186898A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68764084A 1984-12-31 1984-12-31
US687640 1984-12-31

Publications (2)

Publication Number Publication Date
EP0186898A2 true EP0186898A2 (fr) 1986-07-09
EP0186898A3 EP0186898A3 (fr) 1988-10-05

Family

ID=24761217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85116517A Withdrawn EP0186898A3 (fr) 1984-12-31 1985-12-23 Lampe à éclair rapide

Country Status (2)

Country Link
EP (1) EP0186898A3 (fr)
JP (1) JPS61211901A (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2208439A (en) * 1938-03-26 1940-07-16 Gen Electric High intensity light source
US2718771A (en) * 1954-09-01 1955-09-27 Westinghouse Electric Corp Foil-filled photoflash lamps
US2868003A (en) * 1957-02-13 1959-01-13 Gen Electric Photoflash lamp
US3000200A (en) * 1958-06-03 1961-09-19 Gen Electric Flash lamp
US3807935A (en) * 1971-10-14 1974-04-30 Gte Laboratories Inc Flash lamp

Also Published As

Publication number Publication date
JPS61211901A (ja) 1986-09-20
EP0186898A3 (fr) 1988-10-05

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Inventor name: GAVENONIS, THOMAS L.

Inventor name: HEWITT, WILLIAM H.