US3700377A - Photoflash lamp - Google Patents

Photoflash lamp Download PDF

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Publication number
US3700377A
US3700377A US93109A US3700377DA US3700377A US 3700377 A US3700377 A US 3700377A US 93109 A US93109 A US 93109A US 3700377D A US3700377D A US 3700377DA US 3700377 A US3700377 A US 3700377A
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US
United States
Prior art keywords
tube
lobes
anvil
wire
envelope
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
US93109A
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English (en)
Inventor
Stephen V Brown
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
Application granted granted Critical
Publication of US3700377A publication Critical patent/US3700377A/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
    • 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

Definitions

  • a percussive-type photoflash lamp comprises an hermetically sealed, light-transmitting envelope containing a source of actinic light having a primer secured thereto. More particularly, a
  • percussive-type photoflash lamp may comprise a length of glass tubing constricted to a tip at one end thereof and having a primer sealed therein at the other end thereof.
  • the length of glass tubing which defines the lamp envelope contains a combustible such as shredded zirconium foil and a combustion-supporting gas such as oxygen.
  • the primer may comprise a metal tube and a charge of fulminating material on a wire anvil supported therein. Operation of the lamp is initiated by an impact onto the tube of the primer to cause deflagration of the fulminating material on the wire anvil up through the tube to ignite the combustible disposed in the lamp envelope.
  • the fulminating material was dip-applied to one end of the wire anvil.
  • the quantity of fulminating material applied could now be controlled by varying the rate of withdrawal of the wire anvil from the dip cup.
  • the wire anvil was frictionally held in place by undulations formed therein at the other end thereof and frictionally engaging the inner wall of the tube within which it was disposed, thereby eliminating the problem of tube rupture during crimping.
  • the fulminating material was positioned within the primer tube by causing that end of the wire anvil on which the fulminating material is located to bottom therein.
  • this arrangement also was characterized by several deficiencies.
  • the fulminating material frequently ignited during insertion of the wire anvil and the completed lamps were intolerably sensitive to handling. For example, a relatively slight mechanical shock would often flash the lamps regardless of where on the lamp the actual impact occurred.
  • a previous anvil construction directed toward improving support of the anvil within the primer tube employed a set of diametrically disposed protuberances above the area containing the fulminating material.
  • This mode of support provided coaxial orientation only in the vertical plane in which the protuberances were formed. Accordingly, the anvil wire was able to move in directions at right angles to the plane of the single set of lobes. As a result, the coating of fulminatingmaterial could be jarred to within close proximity of the inner wall of the primer tube to occasionally cause inadvertent ignitions.
  • anvil construction In an attempt to improve proper centering of the anvil wire within the primer tube, another anvil construction was employed whereby four swages were pinched from the surface of the anvil wire to provide two sets of diametrically disposed protuberances, all at the same elevation. Although substantially enhancing coaxial positioning of the anvil within the primer tube, this type of construction tended to weaken the anvil wire in theswaged area due to the amount of material needed to produce the protuberances. In addition, it proved difficult to maintain the' tools required to produce the four swages.
  • a principal object of this invention is to provide a percussive-type photoflash lamp having a primer structure which will withstand mechanical shock during manufacture, handling and use without premature flashing.
  • Another object is to provide a primer construction for percussive-type photoflash lamps that permits automated assembly without igniting the fulminating material thereof.
  • A' furtherobject is to provide a primer construction that affords high lamp reliability.
  • FIG. 1 is an elevational view partly in section of a percussive-type photoflash lamp including a wire anvil constructed in accordance with the invention
  • FIG. 2 is a fragmentary detail on an enlarged scale of the primer of the lamp of FIG. 1;
  • FIG. 3 is a cross-section taken along the line 3-3 of FIG. 2.
  • the percussive-type photoflash lamp illustrated in the accompanying drawing comprises a length of glass tubing defining an hermetically sealed lamp envelope 2 constricted at one end to define an exhaust tip 4 and shaped to define a seal 6 about primer 8 at the other end thereof.
  • the primer 8 comprises a metal tube 10, a wire anvil 12 and a charge of fulminating material 14.
  • a combustible such as a filamentary zirconium 16 and a combustion-supporting gas such as oxygen are disposed within the lamp envelope.
  • Wire anvil 12 is provided with a protuberance, or head, 20 at the end thereof which is disposed within the primer tube 10. Further, in accordance with the invention and as particularly shown in FIGS. 2 and 3, a first set of diametrically disposed protuberances 22 are provided intermediate the ends of 'anvil- 12, and a second set of diametrically disposed protuberances 24 are located above the first set of protuberances. To provide the desired coaxial centering of the anvil within tube 10, the set of protuberances 24 are located so as to lie in a plane substantially at right angles with respect to the plane in which the set of protuberances 22 lie.
  • the fulminating material 14 may be dip applied to the wire anvil below the protuberances 22 and subsequently removed from the head 20 so that the entire body of fulminating material is located between the head 20 and the protuberances 22.
  • the diameter of the head 20 and the diameter of a circumscribed circle about the protuberances 22 and 24 are larger than the diameter of the coating of fulminating material 14.
  • Contact of the fulminating material with the inner wall of primer tube 10 is thus avoided by the provided clearance 26.
  • a crimp 28 in the metal tube on or above head 20, positively anchors wire 12, and the protuberances 22 and 24 stabilized it within the primer tube 10.
  • Operation of the lamp is initiated by an impact onto the tube 10 to cause deflagration of the fulminating material 14 up through the tube to ignite combustible 16 disposed within the lamp envelope.
  • This method of construction wherein a set of lobes 24 is swaged immediately above a set of lobes 22, provides the desired stabilization of coaxial alignment of the anvil 12 within tube 10, while at the same time maintaining the structural integrity of the anvil wire and providing a type of construction which is well suited to good dimensional control, as the relatively simple swaging operations minimize tool maintenance.
  • a percussive-type photoflash lamp of this construction is far less sensitive to inadvertent ignition and handling and is therefore more feasible to manufacture and market.
  • high sensitivity to deliberate indentation of the primer tube by a firing device is maintained.
  • Clearance 26 greatly reduces accidental ignitions of the fulminating material during insertion of the wire anvil into the primer tube and crimping thereto.
  • the positive and uniform positionin of the fulminating material made possible by the s ructure provides a much higher lamp reliability.
  • a photoflash lamp comprising:
  • said primer including a tube sealed in said end of said envelope and having an exposed segment outside said envelope, a wire anvil located within said tube, a body of fulminating material located on said wire anvil intermediate its ends and on that segment of said wire anvil located in said exposed segment of said tube but spaced from the inside wall thereof, a first set of diametrically disposed lobes swaged from said wire anvil intermediate its ends and above said body of fulminating material, and a second set of diametrically disposed lobes swaged from said wire anvil immediately above said first set of lobes, said second set of lobes lying in a plane substantially at right angles with respect to the plane in which said first set of lobes lie, and said first and second sets of lobes supporting said wireanvil substantially coaxial with said tube.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US93109A 1970-11-27 1970-11-27 Photoflash lamp Expired - Lifetime US3700377A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9310970A 1970-11-27 1970-11-27

Publications (1)

Publication Number Publication Date
US3700377A true US3700377A (en) 1972-10-24

Family

ID=22237174

Family Applications (1)

Application Number Title Priority Date Filing Date
US93109A Expired - Lifetime US3700377A (en) 1970-11-27 1970-11-27 Photoflash lamp

Country Status (4)

Country Link
US (1) US3700377A (enrdf_load_stackoverflow)
JP (1) JPS549491B1 (enrdf_load_stackoverflow)
GB (1) GB1320598A (enrdf_load_stackoverflow)
ZA (1) ZA717952B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078881A (en) * 1976-12-16 1978-03-14 General Electric Company Photoflash lamp
US4201540A (en) * 1978-04-04 1980-05-06 Gte Sylvania Incorporated Percussively ignited photoflash lamp and method of making same
US4278310A (en) * 1978-04-04 1981-07-14 Gte Products Corporation Method of making a percussively-ignited photoflash lamp

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535063A (en) * 1968-08-30 1970-10-20 Sylvania Electric Prod Photoflash lamp
US3535064A (en) * 1968-09-06 1970-10-20 Sylvania Electric Prod Photoflash lamp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535063A (en) * 1968-08-30 1970-10-20 Sylvania Electric Prod Photoflash lamp
US3535064A (en) * 1968-09-06 1970-10-20 Sylvania Electric Prod Photoflash lamp

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078881A (en) * 1976-12-16 1978-03-14 General Electric Company Photoflash lamp
US4201540A (en) * 1978-04-04 1980-05-06 Gte Sylvania Incorporated Percussively ignited photoflash lamp and method of making same
US4278310A (en) * 1978-04-04 1981-07-14 Gte Products Corporation Method of making a percussively-ignited photoflash lamp

Also Published As

Publication number Publication date
JPS549491B1 (enrdf_load_stackoverflow) 1979-04-25
GB1320598A (en) 1973-06-13
ZA717952B (en) 1972-09-27

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