US3602619A - Photoflash lamp - Google Patents

Photoflash lamp Download PDF

Info

Publication number
US3602619A
US3602619A US860577A US3602619DA US3602619A US 3602619 A US3602619 A US 3602619A US 860577 A US860577 A US 860577A US 3602619D A US3602619D A US 3602619DA US 3602619 A US3602619 A US 3602619A
Authority
US
United States
Prior art keywords
mass
bulb
ignition
top end
cavity
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
US860577A
Other languages
English (en)
Inventor
Johannes Cornelis Van Der Tas
Charles Cornelis Edu Meulemans
Karlo Pedro Martens
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 US3602619A publication Critical patent/US3602619A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

  • Trifari ABSTRACT A photoflash lamp 'of the combustible type, wherein an ignition mass is provided in a cavity of an insulating member, with the ends of the current conductors ending in said cavity that diverges outward toward the end of the bulb remote from the base, the oxidizable metal present in the lamp being kept at a suitable distance from said ends.
  • the invention relates to a photoflash lamp of the combustible type comprising an envelope of a light-pervious material containing an oxidizable metal and an oxidizing gas, which lamp comprises an electric ignition mechanism which is provided with two current conductors which can be connected to a voltage source outside the lamp and which are fixed relative to each other in the lamp by means of a member of an electrically insulating material and are connected by means of an ignition mass situated on the member, which lamp can be fired by the short-lasting application of a high voltage.
  • Photoflash lamps of the combustible type are fired by applying a voltage across the poles of the current conductors, which voltage increases to a high value in a very short time.
  • a breakdown occurs in the ignition mass, followed by the passage of current as a result of which heat is generated in the mass followed by explosive combustion.
  • the voltage across the poles decreases to a low value.
  • the invention is based on the recognition of the fact that the present problems do not occur in a photoflash lamp of the combustible type, when the design of the ignition mass and/or the shape of the body containing said mass is subjected to a number of conditions.
  • the photoflash lamp of the combustible type according to the invention is characterized in that the ignition mass and the member containing said mass comprise a recess which surrounds both the ends of the current conductors and the ignition mass connecting said conductors, and that furthermore means are present for keeping the oxidizable metal at such a distance from the ends of the conductors that the breakdown voltage in the ignition mass between the current conductors is smaller than that between the parts of the current conductors situated outside said mass and also smaller than that between any part of a current conductor and the nearest parts of the oxidizable metal.
  • the photoflash lamp With a recess for the ignition mass in this manner, the possibility is obtained of localizing the ignition mass, of which an accurately prescribed dose is provided in the lamp, around the ends of the current conductors in a manner which can substantially entirely be predicted.
  • the means for keeping said metal at a distance relative to one of the conductor ends may be formed by the ignition mass itself.
  • Said mass is given such a shape that the shortest distance in the mass between the current conductors is smaller than the distance between any part of a current conductor and that surface of the mass with which the oxidizable mass can contact. Separate spacing means are consequently not necessary in this case, and the metal parts can contact the ignition mass without objection and without undesirable leakage paths being present during the short-lasting application of the high voltage.
  • the ignition mass oriented in the recess in the prescribed manner can be surrounded by an annular member which projects to above the surface of the ignition mass remote from the body and the inside diameter of which is chosen to be small so that penetration of the metal into it is counteracted.
  • the recess may be formed as a craterlike cup in the body of insulating material and the annular member is formed by the edge of the crater which projects above the ignition mass and then forms part of the insulating member. It may alternatively be formed as a glass tube. In that case a separate tubular member is arranged around the ignition mass.
  • the ignition mass may be situated on the bead of a bead system. However, it may also be provided in a different place in the photofiash lamp, notably 011 the inner wall of the lamp situated nearest the lamp socket which strongly simplifies particularly the manufacture of very elongate flashlight lamps, in which the length is, for example 10 X the diameter and which are sometimes termed needle lamps.
  • FIG. 1 is a diagrammatic longitudinal cross-sectional view of a photoflash lamp of the prior art.
  • FIG. 2 is a similar cross-sectional view of a photoflash lamp according to the invention.
  • FIG. 3 is a longitudinal cross-sectional view of a photoflash lamp according to another embodiment; in this embodiment the ignition mass is arranged in the bottom of the lamp.
  • FIG. 4 relates to a needlelike photoflash lamp
  • FIG. 5 is a partial view in cross section in an enlarged scale of a recess provided with a quantity of ignition mass.
  • FIG. 1 shows a photoflash lamp which is provided with a transparent envelope 1 or bulb part.
  • the lamp contains an oxidizable metal, for example, zirconium wool, and is filled with oxygen or another gas for reacting with the metal wool.
  • the ignition mechanism comprises two current conductors 5 and 7, which are sealed in a head 9 and are insulated electrically relative to the metal wool 3 over the parts of the conductors between the bead and the bottom of the envelope.
  • the ends of the current supply wires 5, 7 are interconnected by an ignition mass 11 which consists of a mixture of an oxidizing agent, an oxidizable material and a binder.
  • the mass may furthermore comprise an electrically conductive material and an activator.
  • a suitable ignition mass contains, for example, 34.2 percent by weight of zirconium powder, 25.4 percent by weight of potassium perchlorate, 1.9 percent by weight of red phosphorous, 25.8 percent by weight of semiconductive lanthanum cobaltite (La Sn Co0 and 2.7 percent by weight of nitrocellulose as a binder.
  • a voltage which increases to a high value in a very short period of time, across the conductors 5 and 7, breakdown occurs in the ignition mass 11, followed by ohmic heat generation due to current passage in the ignition mass.
  • a piezoelectric voltage source is used.
  • the body from insulating material in the lamps shown in FIGS. 3 and 4 is formed by the lamp socket itself.
  • the ignition mass is again provided in a cavity which widens towards the metal wool or the like to be burnt, which in FIG. 3
  • the lamp shown in FIG. 3 has a more squat shape and the lamp shown in FIG. 4 has a very elongate shape.
  • each of the lamps shown in FIGS. 2, 3 and 4 means are present for causing the breakdown voltage in the ignition mass between two current conductors to be smaller than that between one of the conductors and the nearest parts of the oxidizable metal wool.
  • the ignition mass such a configuration that the distance between the current conductors is always smaller than the distance b" between one of the conductors and the surface of the ignition mass facing the zirconium wool 3 (FIG. 5).
  • This can often be obtained by suitable shape of the recess in the insulating member itself. So in that case the said means are formed by a layer of ignition mass having a thickness b.
  • the insulating means may also comprise an annular member which projects to above the ignition mass.
  • This member may be a glass tube which is shown in broken lines in FIGS. 2 and 3 and is denoted by 19 and 21. The inside diameter of this tube is chosen to be so that metal wool 3 cannot contact the ignition mass 1 1.
  • the annular member may alternatively be formed as a bulged circumferential edge 23 in the inner wall 23 of the lamp socket which surrounds the recess 17 (see FIG. 4).
  • the recess 17 has a craterlike shape which also keeps the metal wool 3 at a distance from the ignitor mass 1 1.
  • a photofiash lamp comprising a. an envelope of light-pervious electrically nonconductive material defining a base part and a bulb part having a top end remote from the base part, the base part defining on its inner surface facing said top end a cavity that diverges outward toward said top end,
  • an ignition mass situated in said cavity with said current conductor ends embedded in said mass, the ends maintained apart a distance such that the breakdown voltage in the ignition mass is less than between any other parts of the two conductors and less than between any part of a conductor and said oxidizable metal.
  • a lamp according to claim 1 further comprising an annular member of electrically nonconductive material disposed generally surrounding the ignition mass with the open end of the annular member facing said top end, for maintaining said mass from physically contacting the oxidizable metal in the bulb.
  • annular member has a bottom portion adjacent the base part and an upper portion that extends higher above the base than said ignition mass.
  • a photoflash lamp comprising a. an envelope of light-pervious material defining a base part and a bulb part having a top end remote from the base part,
  • an electrically nonconductive bead through which said two ends extend, the bead supporting and maintaining said ends at a fixed distance apart, the bead defining on its upper surface facing said top end of the bulb part cavity that diverges outward toward said top end, e. an ignition mass situated in said cavity and in which said conductor ends are embedded and maintained apart a distance such that the breakdown voltage in said mass is less than between any other parts of the two conductors and less than between any part of a conductor and said oxidizing metal.
  • a lamp according to claim 5 further comprising an annular member of electrically nonconductive material disposed generally surrounding the ignition mass with the open end of the annular member facing said top end, for maintaining said mass from physically contacting the oxidizable metal in the bulb.
  • annular member has a bottom portion adjacent the base part and an upper portion that extends higher above the base than said ignition mass.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
US860577A 1968-09-27 1969-09-24 Photoflash lamp Expired - Lifetime US3602619A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6813921A NL6813921A (enrdf_load_stackoverflow) 1968-09-27 1968-09-27

Publications (1)

Publication Number Publication Date
US3602619A true US3602619A (en) 1971-08-31

Family

ID=19804780

Family Applications (1)

Application Number Title Priority Date Filing Date
US860577A Expired - Lifetime US3602619A (en) 1968-09-27 1969-09-24 Photoflash lamp

Country Status (6)

Country Link
US (1) US3602619A (enrdf_load_stackoverflow)
BE (1) BE739405A (enrdf_load_stackoverflow)
ES (1) ES371886A1 (enrdf_load_stackoverflow)
FR (1) FR2019052A1 (enrdf_load_stackoverflow)
GB (1) GB1238170A (enrdf_load_stackoverflow)
NL (1) NL6813921A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752636A (en) * 1970-11-27 1973-08-14 Philips Corp Photoflash lamp
US3768957A (en) * 1971-09-21 1973-10-30 Philips Corp Flash bulb
US3969067A (en) * 1975-03-12 1976-07-13 General Electric Company Photoflash lamp
US3972673A (en) * 1974-09-23 1976-08-03 General Electric Company Photoflash lamp
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4128858A (en) * 1975-04-14 1978-12-05 General Electric Company Multiple flashlamp system
US4229161A (en) * 1979-01-02 1980-10-21 Gte Products Corporation Photoflash lamp and method of making
US4249887A (en) * 1977-12-30 1981-02-10 Westinghouse Electric Corp. Photoflash lamp having gap-fire ignition mount, and method of making the mount
US4314394A (en) * 1978-12-21 1982-02-09 Gte Products Corporation Photoflash lamp construction and method of making same
EP0061751A1 (en) * 1981-03-27 1982-10-06 GTE Products Corporation Filament-type photoflash lamp, process for fabricating the same, and primer material
US4403973A (en) * 1981-06-04 1983-09-13 Gte Products Corporation Photoflash lamp structure and fabrication process
US4432725A (en) * 1982-05-20 1984-02-21 Gte Products Corporation Subminiature flashlamp mount design
US4445847A (en) * 1982-05-26 1984-05-01 Gte Products Corporation Photoflash lamp
US4457700A (en) * 1980-07-21 1984-07-03 Gte Products Corporation Electrically-activated photoflash lamp excluding a press-sealed end portion
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
US20120282394A1 (en) * 2009-12-28 2012-11-08 Posco Composite Ceramic Material and Method for Manufacturing the Same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4270897A (en) * 1978-12-21 1981-06-02 Gte Products Corporation Photoflash lamp construction and method of making same

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752636A (en) * 1970-11-27 1973-08-14 Philips Corp Photoflash lamp
US3768957A (en) * 1971-09-21 1973-10-30 Philips Corp Flash bulb
US3972673A (en) * 1974-09-23 1976-08-03 General Electric Company Photoflash lamp
US3969067A (en) * 1975-03-12 1976-07-13 General Electric Company Photoflash lamp
US4128858A (en) * 1975-04-14 1978-12-05 General Electric Company Multiple flashlamp system
US4097220A (en) * 1976-09-16 1978-06-27 General Electric Company Flash lamp array having shorting lamps
US4249887A (en) * 1977-12-30 1981-02-10 Westinghouse Electric Corp. Photoflash lamp having gap-fire ignition mount, and method of making the mount
US4314394A (en) * 1978-12-21 1982-02-09 Gte Products Corporation Photoflash lamp construction and method of making same
US4229161A (en) * 1979-01-02 1980-10-21 Gte Products Corporation Photoflash lamp and method of making
US4457700A (en) * 1980-07-21 1984-07-03 Gte Products Corporation Electrically-activated photoflash lamp excluding a press-sealed end portion
EP0061751A1 (en) * 1981-03-27 1982-10-06 GTE Products Corporation Filament-type photoflash lamp, process for fabricating the same, and primer material
US4403973A (en) * 1981-06-04 1983-09-13 Gte Products Corporation Photoflash lamp structure and fabrication process
US4432725A (en) * 1982-05-20 1984-02-21 Gte Products Corporation Subminiature flashlamp mount design
US4445847A (en) * 1982-05-26 1984-05-01 Gte Products Corporation Photoflash lamp
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
US20120282394A1 (en) * 2009-12-28 2012-11-08 Posco Composite Ceramic Material and Method for Manufacturing the Same
US9871259B2 (en) 2009-12-28 2018-01-16 Posco Method for manufacturing composite ceramic material

Also Published As

Publication number Publication date
ES371886A1 (es) 1971-11-16
FR2019052A1 (enrdf_load_stackoverflow) 1970-06-26
DE1948089A1 (de) 1970-04-02
BE739405A (enrdf_load_stackoverflow) 1970-03-25
DE1948089B2 (de) 1976-07-29
GB1238170A (enrdf_load_stackoverflow) 1971-07-07
NL6813921A (enrdf_load_stackoverflow) 1970-04-01

Similar Documents

Publication Publication Date Title
US3602619A (en) Photoflash lamp
US3884615A (en) Flash Lamp Mount Construction
US3816054A (en) Photoflash lamp having non-shorting construction
US2280598A (en) Flash lamp
US3535063A (en) Photoflash lamp
US2291983A (en) Flash lamp
US3873260A (en) Photoflash lamp
US3873261A (en) Photoflash lamp
US2361495A (en) Flash lamp
US3556699A (en) Discharge ignition type photoflash lamp
US3325281A (en) Method of producing sintered electrodes
US2768517A (en) Foil-filled photoflash lamp and igniter therefor
US2333725A (en) Photoflash casing
US2868003A (en) Photoflash lamp
US3930784A (en) Photoflash lamp having non-shorting construction
US3285035A (en) Flash lamp
US3016727A (en) Flash lamp
US2386672A (en) Photoflash lamp
US2316344A (en) Flash lamp
US3941555A (en) Non-shorting photoflash lamp
US2651189A (en) Photoflash lamp
US2342575A (en) Flash lamp
US2948824A (en) Device for igniting gaseous or liquid fuels
US2841002A (en) Photo flash lamp
US3945697A (en) Method of manufacturing a photoflash lamp having an indicator-insulator