GB1401314A - Photoflash lamps - Google Patents

Photoflash lamps

Info

Publication number
GB1401314A
GB1401314A GB4046372A GB4046372A GB1401314A GB 1401314 A GB1401314 A GB 1401314A GB 4046372 A GB4046372 A GB 4046372A GB 4046372 A GB4046372 A GB 4046372A GB 1401314 A GB1401314 A GB 1401314A
Authority
GB
United Kingdom
Prior art keywords
envelope
strands
filamentary material
photo
less
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
Application number
GB4046372A
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.)
GTE Sylvania Inc
Original Assignee
GTE Sylvania Inc
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 Sylvania Inc filed Critical GTE Sylvania Inc
Publication of GB1401314A publication Critical patent/GB1401314A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G03B15/0478—Combinations of photographic apparatus with percussion type flash ignition systems
    • G03B15/0484—Constructional details of the flash apparatus
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Luminescent Compositions (AREA)

Abstract

1401314 Photo-flash lamps GTE SYLVANIA Inc 31 Aug 1972 [9 Sept 1971] 40463/72 Heading G2L A photo-flash lamp comprises an hermetically sealed light-transmitting envelope with an internal diameter less than 0.5 inch and an internal volume less than 1 cc containing a combustionsupporting gas and a quantity of filamentary combustible material consisting of a number of strands having lengths slightly longer than or less than the internal diameter of the lamp, the density of the strands within the envelope being such that the strands are self-supporting. The photo-flash lamp is electrically or percusively ignited and the strands, e.g. of zirconium foil of cross-sectional area 1.1 to 1.2 sq mils are preferably less than ¢ inch long. It has been determined that the strand length in inches is given by:- where D is the inside diameter of the envelope, L is the average effective internal length of the envelope, W is the weight of filamentary material within the envelope and K is a constant whose value depends on the composition and crosssections of the filamentary material strands. Preferably the weight of filamentary material within the envelope is at least 20 milligrams, and the density thereof is greater than 25 mgm/c.c. Preferably the filamentary material occupies the two-thirds of the envelope which is opposite the end at which the ignition arrangement is disposed and the distribution of the filamentary material is such that it is denser adjacent the centre of the envelope than adjacent the walls thereof. A number of particular examples are given.
GB4046372A 1971-09-09 1972-08-31 Photoflash lamps Expired GB1401314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US179056A US3895902A (en) 1971-09-09 1971-09-09 Photoflash lamp

Publications (1)

Publication Number Publication Date
GB1401314A true GB1401314A (en) 1975-07-16

Family

ID=22655050

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4046372A Expired GB1401314A (en) 1971-09-09 1972-08-31 Photoflash lamps

Country Status (8)

Country Link
US (1) US3895902A (en)
JP (1) JPS5441204B2 (en)
AU (1) AU4649072A (en)
BE (1) BE788531A (en)
CA (1) CA975572A (en)
DE (1) DE2244182A1 (en)
GB (1) GB1401314A (en)
ZA (1) ZA726043B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217089A (en) * 1975-02-03 1980-08-12 Gte Products Corporation Photoflash lamp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857752A (en) * 1954-04-07 1958-10-28 Gen Electric Flash lamp
US2982119A (en) * 1959-04-27 1961-05-02 Gen Electric Flash lamp
DE1189852B (en) * 1962-02-09 1965-03-25 Patra Patent Treuhand Electric flash lamps and processes for their manufacture

Also Published As

Publication number Publication date
AU4649072A (en) 1974-03-14
BE788531A (en) 1973-03-08
JPS4857625A (en) 1973-08-13
DE2244182A1 (en) 1973-03-15
CA975572A (en) 1975-10-07
ZA726043B (en) 1973-07-25
US3895902A (en) 1975-07-22
JPS5441204B2 (en) 1979-12-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee