US3752636A - Photoflash lamp - Google Patents

Photoflash lamp Download PDF

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Publication number
US3752636A
US3752636A US00197395A US3752636DA US3752636A US 3752636 A US3752636 A US 3752636A US 00197395 A US00197395 A US 00197395A US 3752636D A US3752636D A US 3752636DA US 3752636 A US3752636 A US 3752636A
Authority
US
United States
Prior art keywords
mass
ignition
envelope
photoflash lamp
current
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
US00197395A
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English (en)
Inventor
H Warninck
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.)
US Philips Corp
Original Assignee
US Philips 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
Priority claimed from DE19702058441 external-priority patent/DE2058441C3/de
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3752636A publication Critical patent/US3752636A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

  • a photoflash lamp having an envelope includes a finely Fords Application Priority Data divided actinically combustible material and two current conducting wires which support an ignition mass within the envelope.
  • the mass, which is ignitiable by passing a current through it, consists of an intimate Nov. 27, 1970 P 20 58 441.2
  • the invention relates to a photoflash lamp provided with an envelope comprising a finely divided actinically combustible material and two current conducting wires which support an ignition mass within the envelope, which ignition mass can be ignited by passing a current through it.
  • Such a photoflash lamp is known from German patent specification 1,255,487.
  • the composition of the ignition mass in this known lamp is chosen in such a manner that electrically it consists of a plurality of series and parallel arranged capacitors, or spark gaps and resistors.
  • a condition for the satisfactory operation is that the resistance of the ignition mass measured at a voltage of 20V must be 0.
  • the mass is ignited by a voltage pulse of approximately 100V or more.
  • a drawback of this mass is that the combustion or non-combustion of the ignition mass and the time lapse between switching on the voltages and the instant of ignition is dependent on the rate at which the voltage increases when switched on.
  • the object of the present invention is to provide a photoflash lamp comprising an ignition mass in which this drawback does not occur or hardly occurs.
  • a photoflash lamp with which this object is achieved is characterized in that the ignition mass consists of an intimate mixture of a composition which ignites upon heating and a powder of a satisfactorily conducting metal, the ignition mass hav ing a resistance in the order of 10 Q.
  • the composition igniting upon heating may be the usual ignition mass for photoflash lamps which is ignited by passing an electric current through a filament on which or in the vicinity of which the ignition mass is present.
  • a commonly used ignition mass consists of zirconium powder and potassium chlorate in an ap proximately stoichiometric ratio to which a slight quantity of a binder has been added.
  • An ignition mass suitable for use in the photoflash lamps according to the invention may consist of, for example, 1 part by volume of such a mixture of zirconium powder and potassium chlorate and 2 parts by volume of a powder of a satisfactorily conducting metal. Copper or silver or graphite may be used as satisfactorily conducting metals.
  • An ignition mass of this composition is found to ignite immediately when a voltage of several volts is ap plied, and in its turn it is capable of igniting the combustible material in the flash lamp.
  • the flash lamp according to the invention has the advantage that heat is produced already immediately after the voltage is switched on. In the previously described known flash lamp this is only the case after a conducting path for the current in the ignition mass has been formed by means of a series of electrical breakdowns.
  • the photoflash lamp according to the invention has a glass envelope 1 and a pinch 2.
  • An actinically combustible material 3 and the stem 4 are present within the envelope 1.
  • This stern comprises two current conductors 5 and 6 and a glass body which may be obtained, for example, by sealing a glass bead together with the current conductors 5 and 6 in a glass tube in such a manner that a cavity 7 is formed in which the ignition mass 8 is provided.
  • the ignition mass 8 consists of a mixture of zirconium powder and potassium chlorate in a stoichiometric ratio and silver powder in a volume .ratio of 1 part by volume of stoichiometric mixture and 2 parts by volume of silver powder.
  • the mass was obtained by mixing the stoichiometric mixture with :a product commercially known as Leitsilber.
  • the binder present in the Leitsilber also serves as a binder for the ignition mass.
  • Leitsilber is the commercial name of a product which is marketed by the firm of Degussa in the form of a bright lacquer which contains from 20 to 30 percent by volume of plate-like silver particles and the binder is assumed to be nitrocellulose.
  • a photoflash lamp provided with an envelope comprising a finely divided actinically combustible material and two current conducting wires which support an ignition mass within the envelope, said mass being ignitable by passing a current through it, said mass consisting of an intimate mixture of a composition which burns upon heating and a powder of a satisfactory conducting metal chosen from the group consisting of copper, silver and graphite said mass having a resistance in the order of 10 0.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US00197395A 1970-11-27 1971-11-10 Photoflash lamp Expired - Lifetime US3752636A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702058441 DE2058441C3 (de) 1970-11-27 Blitzlichtlampe

Publications (1)

Publication Number Publication Date
US3752636A true US3752636A (en) 1973-08-14

Family

ID=5789304

Family Applications (1)

Application Number Title Priority Date Filing Date
US00197395A Expired - Lifetime US3752636A (en) 1970-11-27 1971-11-10 Photoflash lamp

Country Status (4)

Country Link
US (1) US3752636A (enExample)
FR (1) FR2187090A5 (enExample)
GB (1) GB1364889A (enExample)
NL (1) NL7116116A (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823994A (en) * 1972-02-19 1974-07-16 Philips Corp Method of making combustion flash bulb
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4128858A (en) * 1975-04-14 1978-12-05 General Electric Company Multiple flashlamp system
US4302182A (en) * 1979-10-19 1981-11-24 Gte Products Corporation Photoflash lamp
US4311453A (en) * 1980-05-05 1982-01-19 Gte Products Corporation High voltage flashlamp with ignition means including a plurality of spark gap members
EP0044551A1 (en) * 1980-07-21 1982-01-27 GTE Products Corporation Method of making a pressurized electrically-activated high-voltage photoflash lamp
EP0044552A1 (en) * 1980-07-21 1982-01-27 GTE Products Corporation Electrically-activated high-voltage photoflash lamp excluding a press-sealed end portion and method of making same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312085A (en) * 1964-03-05 1967-04-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Photoflash lamp with primer
US3602619A (en) * 1968-09-27 1971-08-31 Philips Corp Photoflash lamp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312085A (en) * 1964-03-05 1967-04-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Photoflash lamp with primer
US3602619A (en) * 1968-09-27 1971-08-31 Philips Corp Photoflash lamp

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823994A (en) * 1972-02-19 1974-07-16 Philips Corp Method of making combustion flash bulb
US4128858A (en) * 1975-04-14 1978-12-05 General Electric Company Multiple flashlamp system
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4302182A (en) * 1979-10-19 1981-11-24 Gte Products Corporation Photoflash lamp
US4311453A (en) * 1980-05-05 1982-01-19 Gte Products Corporation High voltage flashlamp with ignition means including a plurality of spark gap members
EP0044551A1 (en) * 1980-07-21 1982-01-27 GTE Products Corporation Method of making a pressurized electrically-activated high-voltage photoflash lamp
EP0044552A1 (en) * 1980-07-21 1982-01-27 GTE Products Corporation Electrically-activated high-voltage photoflash lamp excluding a press-sealed end portion and method of making same
US4369556A (en) * 1980-07-21 1983-01-25 Gte Products Corporation Method of making a photoflash lamp having new lead seal structure

Also Published As

Publication number Publication date
NL7116116A (enExample) 1972-05-30
DE2058441A1 (de) 1972-06-08
FR2187090A5 (enExample) 1974-01-11
GB1364889A (enExample) 1974-08-29
DE2058441B2 (de) 1975-09-11

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