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US3721515A - Combustion flash bulb - Google Patents

Combustion flash bulb Download PDF

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Publication number
US3721515A
US3721515A US00194888A US3721515DA US3721515A US 3721515 A US3721515 A US 3721515A US 00194888 A US00194888 A US 00194888A US 3721515D A US3721515D A US 3721515DA US 3721515 A US3721515 A US 3721515A
Authority
US
United States
Prior art keywords
envelope
inner envelope
flash bulb
combustion
lamp
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
US00194888A
Other languages
English (en)
Inventor
Der Tas J Van
C Meulemans
A Boekkooi
A Hurx
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
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3721515A publication Critical patent/US3721515A/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

  • the invention relates to a combustion flash bulb which comprises a hermetically sealed light-pervious outer envelope and a tubular inner envelope which is open at its end facing the lamp base, the space in the inner envelope communicating with the space in the outer envelope, a filling of an oxidizable metal and an ignition mechanism being present in the inner envelope, an oxygen-containing atmosphere prevailing inside the outer envelope.
  • a combustion flash bulb is known.
  • an inner envelope of a vitreous material is used the coefficient of expansion of which is very low, for example, Vycor or Pyrex.
  • a combustion flash bulb according to the above-described type which is characterized in that the inner envelope, at its narrowed and remote from the lamp base, comprises an aperture the cross-section of which calculated at right angles to the longitudinal axis of the lamp is at most 30 percent of the surface bounded by the inner wall of the inner envelope.
  • an inner envelope can be chosen to consist of a proportionally thin-walled material (wall thickness, for example, 0.25 mm) which need no longer consist of hard glass. lt even does not matter when the inner envelope is destroyed during the combustion of the oxidizable metal.
  • a material for the inner envelope may be chosen, for example, the rather readily workable lime glass.
  • the dimension of the said aperture is chosen to be so that no red-hot particles of the ignition mass occurring in the ignition mechanism can emerge through said aperture and reach the normally weaker top part of the outer envelope.
  • said aperture should be chosen to be so that the oxidizable metal which may be in the form of very narrow strips of zirconium-containing material, does not emerge through said aperture to in the exhaust tube at the lamp top during the manufacture of the lamp.
  • said inner envelope By choosing said inner envelope to consist of a thinwalled tubular material, a larger filling of said envelope can be obtained, for example, while maintaining the internal dimensions of the outer envelope.
  • the inner envelope is movable in the outer envelope in the axial direction, the ignition mechanism being surrounded by the inner envelope in the two extreme axial positions of the inner envelope. It is just in this type of slim flash bulbs that the evacuating and filling path, respectively, for the oxygen-containing gas is very long; the above-mentioned drawbacks then become particularly prominent. It has been found that the inner envelope should remain slightly movable in the outer envelope but in such manner that the tubular inner envelope always surrounds the ignition paste or the like, which forms part of the ignition mechanism. In particular, the distance between the side walls of the inner envelope and the outer envelope should preferably be chosen to be as small as possible.
  • the oxidizable metal accommodated in the inner envelope is kept spaced apart from the ignition mechanism by an adhesive. A few drops of water glass have proved to be a reasonable solution.
  • the outer blue layer of laquer which is usually provided on the outer envelope may even byomitted.
  • the invention may be applied to various types of combustion flash bulbs. It may be used for lamps which are operated with a low voltage source or with a high voltage source by means of a piezo-electric ignition.
  • the drawing shows a combustion flash bulb which comprises a tubular outer envelope 1, a lamp base 2 and a tip 3 which is obtained by sealing an exhaust tube 4.
  • Two current conductors 5 and 6 are sealed in the lamp base 2 and terminate in a cup-shape cavity 7 which is present in a raised base portion 8.
  • An ignition The dimensions of the lamp are: outer diameter 6 mm,
  • the ignition of said lamp takes place by the shortlasting application of a high voltage from a piezoelectric voltage source, as a result of which break-down by the ignition mass occurs succeeded by a current passage in which the thermal energy necessary for starting the explosive combustion is produced in the ignition mass 9.
  • a high voltage from a piezoelectric voltage source as a result of which break-down by the ignition mass occurs succeeded by a current passage in which the thermal energy necessary for starting the explosive combustion is produced in the ignition mass 9.
  • a tubular inner envelope ll of thin-walled material (wall thickness 0.3 mm) is arranged with some amount of play in the envelope 1 (a at most 0.5 mm).
  • This inner envelope 1] manufactured from lime glass is arranged in the outer envelope so as to be slightly movable and that in such manner that said inner envelope always surrounds the ignition mass 9 in its two extreme axially moved positions.
  • This inner tube intercepts the thrown-away red-hot particles during the ignition of the ignition mass 9 which particles, in the absence of said envelope 11, would be thrown against the outer en velope and might give rise there to a considerable weakening and even fracture of the envelope 1. So the envelope 1] may be considered as a particle shield.
  • the inner envelope 11 At its end remote from the lamp base 2, the inner envelope 11 comprises an aperture 12 the diameter of which is 1 mm.
  • This aperture 12 is a contribution that in spite of the presence of the envelope 11 on the one hand the lamp vessel 1 can easily be evacuated in all places of its contents and be filled with an oxygen-containing atmosphere. Furthermore, upon ignition of the lamp and the combustion of the metal wool 10, the shock wave moving in the longitudinal direction of the envelope 11 will be guided through said aperture 12 to the space between the envelopes l and 11 as a result of which said shock wave is attenuated.
  • the dome-shaped end of the inner envelope 1 1 with its aperture 12 holds the metal wool 10 at a distance from the exhaust tube 4.
  • the oxidizable metal 10 is furthermore kept spaced apart from the ignition mechanism by a suitable adhesive. This may consist of a few drops of water glass which are deposited in the wide part of the inner tube which is held with its aperture 12 downwards and in which a clew of metal wool is pressed.
  • the inner envelope 11 may be formed from a blue-colored vitreous mass.
  • a combustion flash bulb which comprises a hermetically sealed light-pervious outer envelope and a tubular inner envelope which is open at its end facing the lamp base, the space in the inner envelope communicating with the space in the outer envelope, a filling of an oxidizable metal and an ignition mechanism being present in the inner envelope, an oxygen-containing atmosphere prevailing inside the outer envelope, wherein the inner envelope, at its narrowed end remote from the lamp base, includes an aperture the cross-section of which calculated at right angles to the longitudinal axis of the lamp, is at most 30 percent of the surface bounded by the inner wall of the inner envelope.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Spark Plugs (AREA)
  • Discharge Lamp (AREA)
US00194888A 1970-11-05 1971-11-02 Combustion flash bulb Expired - Lifetime US3721515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7016182A NL7016182A (xx) 1970-11-05 1970-11-05

Publications (1)

Publication Number Publication Date
US3721515A true US3721515A (en) 1973-03-20

Family

ID=19811461

Family Applications (1)

Application Number Title Priority Date Filing Date
US00194888A Expired - Lifetime US3721515A (en) 1970-11-05 1971-11-02 Combustion flash bulb

Country Status (10)

Country Link
US (1) US3721515A (xx)
JP (1) JPS5028255B1 (xx)
AT (1) AT319038B (xx)
BE (1) BE774868A (xx)
CA (1) CA943365A (xx)
FR (1) FR2113559A5 (xx)
GB (1) GB1307958A (xx)
IT (1) IT941070B (xx)
NL (1) NL7016182A (xx)
SE (1) SE359155B (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4270897A (en) * 1978-12-21 1981-06-02 Gte Products Corporation Photoflash lamp construction and method of making same
US4314394A (en) * 1978-12-21 1982-02-09 Gte Products Corporation Photoflash lamp construction and method of making same
US4403973A (en) * 1981-06-04 1983-09-13 Gte Products Corporation Photoflash lamp structure and fabrication process
EP0810622A2 (de) * 1996-05-28 1997-12-03 Schott Glaswerke Verfahren zur Herstellung einer Lampe und nach dem Verfahren hergestellte Lampe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5222168U (xx) * 1975-08-01 1977-02-16
JPS5296279U (xx) * 1976-01-16 1977-07-19
JPS5412773U (xx) * 1977-06-25 1979-01-27

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4270897A (en) * 1978-12-21 1981-06-02 Gte Products Corporation Photoflash lamp construction and method of making same
US4314394A (en) * 1978-12-21 1982-02-09 Gte Products Corporation Photoflash lamp construction and method of making same
US4403973A (en) * 1981-06-04 1983-09-13 Gte Products Corporation Photoflash lamp structure and fabrication process
EP0810622A2 (de) * 1996-05-28 1997-12-03 Schott Glaswerke Verfahren zur Herstellung einer Lampe und nach dem Verfahren hergestellte Lampe
EP0810622A3 (de) * 1996-05-28 1998-03-04 Schott Glaswerke Verfahren zur Herstellung einer Lampe und nach dem Verfahren hergestellte Lampe

Also Published As

Publication number Publication date
AT319038B (de) 1974-11-25
CA943365A (en) 1974-03-12
DE2153980A1 (de) 1972-05-10
SE359155B (xx) 1973-08-20
FR2113559A5 (xx) 1972-06-23
JPS5028255B1 (xx) 1975-09-13
DE2153980B2 (de) 1976-01-15
BE774868A (fr) 1972-05-03
IT941070B (it) 1973-03-01
GB1307958A (en) 1973-02-21
NL7016182A (xx) 1972-05-09

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