US3734678A - Photoflash lamp - Google Patents

Photoflash lamp Download PDF

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Publication number
US3734678A
US3734678A US00153212A US3734678DA US3734678A US 3734678 A US3734678 A US 3734678A US 00153212 A US00153212 A US 00153212A US 3734678D A US3734678D A US 3734678DA US 3734678 A US3734678 A US 3734678A
Authority
US
United States
Prior art keywords
envelope
lamp
combustible material
network
web
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
US00153212A
Other languages
English (en)
Inventor
R Liepert
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 GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 DE19702034328 external-priority patent/DE2034328C3/de
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Application granted granted Critical
Publication of US3734678A publication Critical patent/US3734678A/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
    • F21K5/023—Ignition devices in photo flash bulbs
    • F21K5/026—Ignition devices in photo flash bulbs using mechanical firing, e.g. percussion of a fulminating charge
    • 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
    • G03B15/0442—Constructional details of the flash apparatus; Arrangement of lamps, reflectors, or the like

Definitions

  • the combustible [58] Field of Search ..431/93, 94, 9s material is a P y y Stable web, mesh or network of foil or wire designed as a hollow body fitting the shape [56] R fere Cit d of the bulb and bearing against the bulb wall.
  • the present invention relates to mechanically ignitable photoflash lamps as disclosed, for example, in application U.S. Ser. 838,758.
  • Such photoflash lamps have a metallic igniter tube sealed into the lamp envelope, which is in communication with the interior of the envelope. The end of the tube projects externally of the envelope and is closed and contains a percussionsensitive igniting material.
  • the igniting material reacts and the flame generated thereby and accompanied by a pressure wave, initiates the process of combustion in the lamp.
  • the light-generating combustible material in the lamp envelope consists preferably of finely divided zirconium, and the gaseous atmosphere is oxygen.
  • the pressure wave generated by ignition of the igniting material may cause an irregular distribution of the combustible material within the lamp envelope; in particular, it may be propelled into the dome of the bulb. This results in irregular light distribution and reduced light output during flashing of the lamp.
  • the combustible material is designed as a physically stable web or network which has the shape of a hollow body with at least one aperture; it is fitted to the shape of the lamp envelope and is located adjacent to, preferably bearing against the wall of the lamp envelope.
  • FIG. 1 shows a lamp in accordance with the invention comprising a physically stable web or network of combustible material in the shape of a hollow cylinder open at both ends.
  • FIG. 2 shows a lamp in accordance with the invention comprising a physically stable web or network of combustible material in the shape of a hollow cylinder open at one end.
  • FIGS. 3 and 4 respectively, show a photoflash lamp according to FIGS. 1 and 2, respectively, comprising an igniter tube provided with an ignition capsule.
  • the photoflash lamp comprises a light-transmissive tubular envelope 1, which is filled with combustible material and oxygen at a pressure of about 7 at.
  • An igniter tube 3 of copper or of an iron-nickel alloy is sealed into one end of the envelope, the igniter tube being in communication with the interior of the envelope and closed at its end 4 projecting externally of the envelope.
  • the portion of the igniter tube 3 projecting externally of the envelope is filled with a percussionsensitive igniting material 5.
  • the igniting material may be loosely filled into the igniter tube (FIGS. 1 and 2).
  • the igniting material is contained in a capsule 6 (FIGS. 3, 4) provided with an anvil and disposed within the igniter tube.
  • the end 4 of the igniter tube 3 may be closed by coldpress welding even after the igniter tube 3 has been sealed into the glass envelope. It is preferred, however, to seal an already closed copper tube into the bulb.
  • the other end of the lamp envelope comprises an exhaust tip 7, which is formed by drawing the lamp envelope off the exhaust tube.
  • the combustible material in the lamp envelope consists of a physically stable, that is, form-stable, web, mesh or network of foil or wire, preferably of crimped zirconium shreds, and has the shape of a hollow body 2 fitted to the shape of the lamp envelope. It has an aperture facing the igniter tube 3.
  • the hollow body 2 With a substantially cylindrical envelope shape, the hollow body 2 has the shape of a hollow cylinder. It may be open at both ends (FIGS. 1 and 3) or open at one end only (FIGS. 2 and 4).
  • the walls of the cylinder are located adjacent the wall of the envelope. They preferably bear against the walls of the envelope over at least a major portion thereof.
  • the shape of the hollow body resembles a hollow sphere provided with an aperture in a place facing the igniter tube.
  • the pressure wave generated by the ignition can freely expand through the aperture into the hollow space devoid of igniting material without causing displacement of the combustible material during ignition.
  • Photoflash lamp comprising a light-transmitting envelope
  • an igniter tube sealed into the envelope having one end in communication with the interior of the envelope and the other end projecting externally of the envelope, the other end being closed and containing a percussion-sensitive igniting material,
  • the combustible material is a physically stable web or network in the shape of a substantially cylindrical hollow body provided with at least one axial aperture facing the one end of the igniter tube, the web or network forming said body being shaped to fit the shape of the lamp envelope and located adjacent the wall of the lamp envelope, so that a pressure wave generated by ignition of said percussion-sensitive igniting material can freely expand through said aperture into the hollow space within the hollow body and devoid of igniting material, and without causing displacement of the combustible material during ignition.
  • Photoflash lamp as set forth in claim 1, wherein at least a major portion of the web or network of combustible material bears against a major portion of the lamp envelope.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US00153212A 1970-07-10 1971-06-15 Photoflash lamp Expired - Lifetime US3734678A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702034328 DE2034328C3 (de) 1970-07-10 Blitzlichtlampe

Publications (1)

Publication Number Publication Date
US3734678A true US3734678A (en) 1973-05-22

Family

ID=5776408

Family Applications (1)

Application Number Title Priority Date Filing Date
US00153212A Expired - Lifetime US3734678A (en) 1970-07-10 1971-06-15 Photoflash lamp

Country Status (3)

Country Link
US (1) US3734678A (enrdf_load_stackoverflow)
JP (1) JPS5514481B1 (enrdf_load_stackoverflow)
BE (1) BE769701A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4147497A (en) * 1977-01-04 1979-04-03 Gte Sylvania Incorporated Hand-operable signal device using percussively-ignitable flashlamps
US4445847A (en) * 1982-05-26 1984-05-01 Gte Products Corporation Photoflash lamp

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2057583A (en) * 1933-07-31 1936-10-13 Gen Electric Flash lamp
US2238780A (en) * 1937-10-30 1941-04-15 Gen Electric Flash lamp
US2611255A (en) * 1948-03-04 1952-09-23 Hartford Nat Bank & Trust Co Flashbulb
US3586471A (en) * 1969-11-19 1971-06-22 Sylvania Electric Prod Photoflash lamp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2057583A (en) * 1933-07-31 1936-10-13 Gen Electric Flash lamp
US2238780A (en) * 1937-10-30 1941-04-15 Gen Electric Flash lamp
US2611255A (en) * 1948-03-04 1952-09-23 Hartford Nat Bank & Trust Co Flashbulb
US3586471A (en) * 1969-11-19 1971-06-22 Sylvania Electric Prod Photoflash lamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4147497A (en) * 1977-01-04 1979-04-03 Gte Sylvania Incorporated Hand-operable signal device using percussively-ignitable flashlamps
US4445847A (en) * 1982-05-26 1984-05-01 Gte Products Corporation Photoflash lamp

Also Published As

Publication number Publication date
DE2034328B2 (de) 1977-02-17
JPS5514481B1 (enrdf_load_stackoverflow) 1980-04-16
BE769701A (fr) 1971-11-16
DE2034328A1 (de) 1972-01-13

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