US3685947A - Photoflash lamp - Google Patents

Photoflash lamp Download PDF

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Publication number
US3685947A
US3685947A US77801A US3685947DA US3685947A US 3685947 A US3685947 A US 3685947A US 77801 A US77801 A US 77801A US 3685947D A US3685947D A US 3685947DA US 3685947 A US3685947 A US 3685947A
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US
United States
Prior art keywords
ignition
current conductors
mass
photoflash lamp
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
US77801A
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English (en)
Inventor
Charles Cornelis Edu Meulemans
Johannes Cornelis Van Der Tas
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
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3685947A publication Critical patent/US3685947A/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 photoflash lamp including an envelope of light-transmitting material and two current conductors protruding from the lamp, a combustible material, and oxidizing gas and an ignition mass being present within the envelope and the end facesof the current conductors within the envelope being in contact with the ignition mass which is provided on a body of electrically insulating material encompassing at least part of the two current conductors within the envelope.
  • the envelope consists of, for example, glass and is provided with one or more optionally blue-colored lacquer layers. Furthermore the lamp has at least one pinch through which the current conductors are passed.
  • the envelope contains a combustible material such as a wire filling of zirconium, and oxygen is generally used as an oxidizing gas.
  • the current conductors within the envelope are usually fixed relative to each other by means of a body of electrically insulating material, for example, of glass or a ceramic material which encompasses at least part of the conductors located within the envelope.
  • An ignition mass which explosively burns upon ignition is present on the body of electrically insulating material. During this combustion incandescent particles within the envelope are hurled away and initiate the actinical light-producing reaction between the combustible material and the oxidizing gas.
  • the ignition mass generally consists of a mixture of an oxidant such as potassium perchlorate, a metal powder, for example, zirconium and a binder such as nitrocellulose. This mass is ignited by connecting the current conductors to a suitable voltage source. An electric breakdown in the mass is then effected which evolves heat and brings the mass locally at the ignition temperature.
  • an oxidant such as potassium perchlorate
  • a metal powder for example, zirconium
  • a binder such as nitrocellulose
  • the distance between the end faces of the current conductors which are in contact with the ignition mass is small and is maintained constant as much as possible within certain limits for each lamp during manufacture;
  • the dimensions of the part of the current conductors which is in contact with the ignition mass is as large as possible but is maintained constant as much as possible for each lamp during manufacture;
  • the distance between the end faces of the current conductors being in contact with the ignition mass is smaller than the distance between an arbitrary point of such an end face and a part of the surface of the ignition mass accessible to the combustible material.
  • a photoflash lamp according to the invention is characterized in that the end faces of the current conductors substantially coincide with the surface of the body of electrically insulating material and are each in electrical contact with their own electrically conducting layer provided on the surface of the body, and that the ignition mass is provided on the conducting layers which do not establish mutual electrical contact, the ignition mass shunting the non-conducting part of the surface of the body between these electrically conducting layers.
  • the substantial coincidence of the end faces of the current conductors with the surface of the body of electrically insulating material is understood to mean that the end faces of the current conductors do not essentially extend more above the surface of the body than the thickness of the electrically conducting layers on this surface.
  • the thickness of the electrically conducting layers may be, for example, between I and um.
  • the electrically insulating body is provided with a groove located centrally between those points of the surface of the body where the surface is penetrated by the current conductors and is directed at right angles to the line of connection between these points.
  • the raised edges of the groove are then coated with electrically conducting layers which are in contact with the end face s of the current conductors.
  • the bottom of the groove is not coated with an electrically conducting layer.
  • the electrically conducting layers may be provided by a number of different methods. Some of these methods will be briefly described hereinafter, because these methods as such are considered to be sufficiently known to those skilled in the art.
  • the surface of the body of electrically insulating material intended for this purpose is provided with an electrically conducting layer of metal or a conducting compound such as SnO In O for example, by means of vapor deposition, sputtering, by an electroless method, electrolysis or, for example, with the aid of a metal lacquer.
  • an electrically conducting layer is provided on the entire surface, it is possible to remove part thereof, for example, by means of an etching method while covering part of the layer with an etching resist or by mechanical removal of the metal layer.
  • FIG. 1 is a perspective elevational view of a body of insulating material without an ignition mass
  • FIG. 2 is a cross-sectional view of the body of FIG. 1, taken on the line II-II including an ignition mass,
  • FIG. 3 and FIG. 4 are plane view of bodies of insulating material on which conducting layers have been provided in accordance with difierence patterns
  • FIG. 5 is a perspective elevational view of a preferred embodiment of a body of insulating material
  • FIG. 6 is a cross-sectional view taken on the line VIVI of the body of FIG. 6 including an ignition mass
  • FIG. 7 is a cross-sectional view of a photoflash lamp including a body according to FIG. 6.
  • the reference numeral 1 denotes a discshaped body of electrically insulating material. Such a body may consist of, for example, glass.
  • Two current conductors 2 and 3 are secured in the body 1 by means of sealing in or in a different manner suitable for this purpose. Each current conductor is in electrical contact with its own electrically conducting layers 4 and 5, respectively.
  • FIG. 2 illustrates a crosssectional view of the body 1 etc. taken on the line II)I of FIG. 1.
  • this Figure also shows the ignition mass 6.
  • FIGS. 3 and 4 show a few configurations of electrically conducting layers.
  • the metal layers 4 and 5 may be obtained in accordance with the shapes shown, for example, by first providing a metal layer at a thickness of approximately 25 pm, for example, by means of vapor deposition in vacuo on the surface of the body I intended for this purpose. Subsequently a photoresist is provided on the metal layer. The photoresist is exposed in accordance with the desired pattern and is subsequently developed. The parts of the metal layer bared during development are subsequently etched away. The part of the resist layer left during development is the removed and the ignition mass 6 is provided.
  • FIG. 5 illustrates a perspective elevational view of a preferred embodiment of a body 1.
  • This body 1 is provided with a groove 7 whose raised edges are coated with electrically conducting layers which form part of the conducting layers 4 and 5.
  • FIG. 6 also illustrates a cross-sectional view taken on the line V-V of FIG. 5, and this Figure also shows the ignition mass 6.
  • FIG. 7 illustrates a cross-sectional view of a preferred embodiment of a photoflash lamp according to the invention, in which parts of the current conductors 2 ad 3 are sealed in in the pinch 10.
  • a (zirconium) metal wire filling 9 is present within the envelope 8.
  • a photoflash lamp of the type having an envelope of light transmitting material, two current conductors protruding from the lamp, a combustible material, an oxidizing gas, and an ignition mass, wherein the improvement comprises:
  • each of the current conductors being brought through the body to respective layers and forming electrical contact with said layers, electrical contact being avoided between said layers allowing surface exposure of a non-conducting portion of said body, the end faces of the conductors substantially coinciding with the top surface of the body, said ignition mass being disposed on the conducting layers and shunting the non-conducting portion of said body between said layers.
  • a photoflash lamp as claimed in claim 1 wherein the surface of the body of electrically insulated material is provided with a groove located centrally between those points of the surface of the body where said surface is penetrated by the current conductors and is directed at right angles to the line of connection between said points, the independent conducting layers extending to the vert ical edges pf said grooves.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
US77801A 1969-10-13 1970-10-05 Photoflash lamp Expired - Lifetime US3685947A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6915476A NL6915476A (enrdf_load_stackoverflow) 1969-10-13 1969-10-13

Publications (1)

Publication Number Publication Date
US3685947A true US3685947A (en) 1972-08-22

Family

ID=19808105

Family Applications (1)

Application Number Title Priority Date Filing Date
US77801A Expired - Lifetime US3685947A (en) 1969-10-13 1970-10-05 Photoflash lamp

Country Status (6)

Country Link
US (1) US3685947A (enrdf_load_stackoverflow)
BE (1) BE757411A (enrdf_load_stackoverflow)
DE (1) DE2048720A1 (enrdf_load_stackoverflow)
FR (1) FR2065258A5 (enrdf_load_stackoverflow)
GB (1) GB1258228A (enrdf_load_stackoverflow)
NL (1) NL6915476A (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873261A (en) * 1973-11-16 1975-03-25 Gen Electric Photoflash lamp
US4025285A (en) * 1975-10-28 1977-05-24 Gte Sylvania Incorporated Photoflash lamp
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4278420A (en) * 1979-07-16 1981-07-14 Gte Products Corporation Photoflash lamp, method of making same, and photoflash circuit
US4311453A (en) * 1980-05-05 1982-01-19 Gte Products Corporation High voltage flashlamp with ignition means including a plurality of spark gap members
US4341513A (en) * 1980-05-05 1982-07-27 Gte Products Corporation Subminiature photoflash lamp having light-emitting pyrotechnic charge
US4614494A (en) * 1985-12-10 1986-09-30 Gte Products Corporation Primer insulating base
US4659308A (en) * 1985-12-10 1987-04-21 Gte Products Corporation Photoflash lamp with improved primer
US4696641A (en) * 1986-08-11 1987-09-29 Gte Products Corporation Primer material and photoflash lamp
EP0936436A1 (fr) * 1998-02-16 1999-08-18 AEROSPATIALE Société Nationale Industrielle Dispositif d'émission de rayonnements infrarouges
US20030217663A1 (en) * 2002-05-27 2003-11-27 Trw Occupant Restraint Systems Gmbh & Co. Kg Method of producing a device containing pyrotechnical material and device obtainable by this method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771765A (en) * 1954-09-01 1956-11-27 Westinghouse Electric Corp Photoflash lamp
US3224236A (en) * 1963-07-15 1965-12-21 Ment Jack De Noble gas flash lamp and laser light source
US3501254A (en) * 1966-09-30 1970-03-17 Philips Corp Combustion flash lamp which can be arranged in a holder in parallel connection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771765A (en) * 1954-09-01 1956-11-27 Westinghouse Electric Corp Photoflash lamp
US3224236A (en) * 1963-07-15 1965-12-21 Ment Jack De Noble gas flash lamp and laser light source
US3501254A (en) * 1966-09-30 1970-03-17 Philips Corp Combustion flash lamp which can be arranged in a holder in parallel connection

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873261A (en) * 1973-11-16 1975-03-25 Gen Electric Photoflash lamp
US4025285A (en) * 1975-10-28 1977-05-24 Gte Sylvania Incorporated Photoflash lamp
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4278420A (en) * 1979-07-16 1981-07-14 Gte Products Corporation Photoflash lamp, method of making same, and photoflash circuit
US4311453A (en) * 1980-05-05 1982-01-19 Gte Products Corporation High voltage flashlamp with ignition means including a plurality of spark gap members
US4341513A (en) * 1980-05-05 1982-07-27 Gte Products Corporation Subminiature photoflash lamp having light-emitting pyrotechnic charge
US4614494A (en) * 1985-12-10 1986-09-30 Gte Products Corporation Primer insulating base
US4659308A (en) * 1985-12-10 1987-04-21 Gte Products Corporation Photoflash lamp with improved primer
US4696641A (en) * 1986-08-11 1987-09-29 Gte Products Corporation Primer material and photoflash lamp
EP0936436A1 (fr) * 1998-02-16 1999-08-18 AEROSPATIALE Société Nationale Industrielle Dispositif d'émission de rayonnements infrarouges
FR2775070A1 (fr) * 1998-02-16 1999-08-20 Aerospatiale Dispositif d'emission de rayonnements infrarouges
US20030217663A1 (en) * 2002-05-27 2003-11-27 Trw Occupant Restraint Systems Gmbh & Co. Kg Method of producing a device containing pyrotechnical material and device obtainable by this method
US6935241B2 (en) * 2002-05-27 2005-08-30 Trw Occupant Restraint Systems Gmbh & Co. Kg Method of producing a device containing pyrotechnical material and device obtainable by this method

Also Published As

Publication number Publication date
GB1258228A (enrdf_load_stackoverflow) 1971-12-22
FR2065258A5 (enrdf_load_stackoverflow) 1971-07-23
DE2048720A1 (de) 1971-04-22
NL6915476A (enrdf_load_stackoverflow) 1971-04-15
BE757411A (fr) 1971-04-13

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