GB1203857A - Photoflash lamp and composition of matter - Google Patents

Photoflash lamp and composition of matter

Info

Publication number
GB1203857A
GB1203857A GB4050068A GB4050068A GB1203857A GB 1203857 A GB1203857 A GB 1203857A GB 4050068 A GB4050068 A GB 4050068A GB 4050068 A GB4050068 A GB 4050068A GB 1203857 A GB1203857 A GB 1203857A
Authority
GB
United Kingdom
Prior art keywords
weight
charge
particles
envelope
phosphorus
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
GB4050068A
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
Sylvania Electric Products 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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB1203857A publication Critical patent/GB1203857A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Dental Preparations (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Cookers (AREA)

Abstract

1,203,857. 857. Flash-bulbs. SYLVANIA ELECTRIC PRODUCTS Inc. Aug.23, 1968 [Aug.23, 1967], No.40500/68. Heading G2L. [Also in Division C1] A flash-bulb adapted to be percussively ignited comprises a glass envelope containing a combustion-supporting gas, e.g. oxygen, and shredded combustible metal, e.g. zirconium, and a base secured to the envelope and containing a fulminating charge comprising particles of percussively detonatable material and a powdered combustible metal together with particles of an abrasive inert filler. The interior of the base and the interior of the envelope are in communication with one another so that when the charge is detonated the particles of combustible metal are heated to incandescence and blown into the envelope where they ignite the shredded combustible metal. The charge preferably has the following composition: a) 15-80% by weight of a mixture of phosphorus and potassium chlorate, the phosphorus constituting one fifth to one half of the mixture. b) up to 50% by weight of powdered zirconium, hafnium and/or thorium, the powder having a particle size of the order of 0À5 to 5 microns. c) up to 50% by weight of powdered silica, titania, zirconia, silicon carbide or fused aluminium oxide having a particle size between 100 and 200 microns. d) up to 1% weight of a particulate material capable of reacting with any phosphoric acid present to form a salt, preferably particles of an alkaline earth metal oxide such as magnesium oxide. e) a dessicant such as silica gel. f) between 0À25 and 4% by weight of a binder such as hydroxyethyl-cellulose, nitrocellulose or methyloxycellulose. In a modification the charge is divided into two portions containing the phosphorus and potassium chlorate, respectively, the balance of the ingredients being mixed with one or other of the portions. The two portions are placed in contact with one another in the base. The flashbulb may be of the form described in Specification 1, 203, 858.
GB4050068A 1967-08-23 1968-08-23 Photoflash lamp and composition of matter Expired GB1203857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66275667A 1967-08-23 1967-08-23

Publications (1)

Publication Number Publication Date
GB1203857A true GB1203857A (en) 1970-09-03

Family

ID=24659083

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4050068A Expired GB1203857A (en) 1967-08-23 1968-08-23 Photoflash lamp and composition of matter

Country Status (4)

Country Link
BE (1) BE719784A (en)
DE (1) DE1797120C3 (en)
FR (1) FR1587680A (en)
GB (1) GB1203857A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2194942A1 (en) * 1973-07-31 1974-03-01 Pains Wessex Ltd

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2194942A1 (en) * 1973-07-31 1974-03-01 Pains Wessex Ltd

Also Published As

Publication number Publication date
DE1797120A1 (en) 1971-02-11
DE1797120C3 (en) 1974-04-04
BE719784A (en) 1969-02-24
DE1797120B2 (en) 1973-08-30
FR1587680A (en) 1970-03-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee