US3884615A - Flash Lamp Mount Construction - Google Patents

Flash Lamp Mount Construction Download PDF

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Publication number
US3884615A
US3884615A US453487A US45348774A US3884615A US 3884615 A US3884615 A US 3884615A US 453487 A US453487 A US 453487A US 45348774 A US45348774 A US 45348774A US 3884615 A US3884615 A US 3884615A
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US
United States
Prior art keywords
inleads
opening
flash lamp
insulative member
bulb
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
US453487A
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English (en)
Inventor
John C Sobieski
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US453487A priority Critical patent/US3884615A/en
Priority to AR257889A priority patent/AR204195A1/es
Priority to CA217,514A priority patent/CA1021587A/en
Priority to DE19752504188 priority patent/DE2504188C3/de
Priority to NL7501984A priority patent/NL7501984A/xx
Priority to BR1292/75A priority patent/BR7501292A/pt
Priority to GB945675A priority patent/GB1473815A/en
Priority to JP50028737A priority patent/JPS50126413A/ja
Priority to IT21442/75A priority patent/IT1034418B/it
Priority to SU7502115949A priority patent/SU583779A3/ru
Priority to FR7508849A priority patent/FR2265033B1/fr
Priority to BE154610A priority patent/BE827007A/xx
Application granted granted Critical
Publication of US3884615A publication Critical patent/US3884615A/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

  • ABSTRACT pp 453,487 A glass bead is provided over an end of a pair of inlead wires for a flash lamp. An opening is provided through the bead between and in communication with 52 U.S. Cl. 431 95 E Int Cl Fzlk 4 both inlead WIICS, and 1s filled with primer material.
  • the invention is in the field of photoflash lamps of the so-called high-voltage type, which contain a primer material connected across inlead wires, there being no conventional filament in such a lamp.
  • the mount for such a lamp comprises an assembly including inlead wires and primer material.
  • Photoflash lamps may be classified generally into two voltage types: low-voltage and high-voltage.
  • the lowvoltage types usually are intended to be flashed by a battery, or a charged capacitor, having a voltage of about 1.5 voltsto volts, whereas the high-voltage flash lamps are intended to be flashed by a firing pulse of a few hundred volts or greater such as can be produced by a piezoelectric element.
  • .Conventional lowvoltage flash lamps contain a filament connected across inlead wires. When the filament is heated by a firing current, it ignites a primer material which in turn ignites a combustible material such as metal foil which, with the aid of oxygen in the lamp, produces a flash of light.
  • the primer material is connected directly across and between a pair of inlead wires extending into the lamp envelope.
  • the primer material may be positioned and carried in the lamp on top of a glass or ceramic insulating material member through which the inlead wires extend, or may be carried in a cavity in such a member.
  • the primer material is carried on or in a depression in the inner wall of the envelope at the bottom of the lamp.
  • the primer material is applied to one or both of the inlead wires within the lamp and the electrical circuit is completed through the combustible shredded metal foil in the lamp.
  • Objects of the invention are to provide a new and improved mount construction for flash lamps, and to provide flash lamps incorporating such mounts, in which the primer will reliably ignite the combustible material in the lamp, and in which a flashed lamp will reliably have a high impedance 'across its lead-in wires.
  • the invention comprises, briefly and in a preferred embodiment, a flash lamp mount construction comprising a glass bead or other electrically insulative member provided over an end of a pair of inlead wires.
  • An opening is provided through the bead member between and in communication with both of the inlead wires, and primer material is provided in the opening and electrically bridges across the inlead wires.
  • primer material is provided in the opening and electrically bridges across the inlead wires.
  • the aforesaid opening extends fully through the bead member, in a direction parallel to the inlead wires.
  • a portion of the bead member extends above and over and overlies at least a portion of the ends of the inlead wires.
  • One of the inlead wires may extend through the top of the bead member and into contact with combustible material in the lamp.
  • the underside of the bead member may be sleeved or shaped to provide increased electrical insulation at the inlead wires to prevent shorting between them.
  • FIG. 1 is a side view of a photoflash lamp in accordance with a preferred embodiment of the invention.
  • FIG. 2 is a top view of the mount in the flash lamp of FIG. 1.
  • FIG. 3 is a side cross-sectional view of the mount construction.
  • FIGS. .4, 5, and 6 are side cross-sectional views of modified mount constructions in accordance with the invention.
  • FIG. 7 is a side view of a flash lamp construction in accordance with another preferred embodiment of the invention.
  • FIG. 8 is a side cross-sectional view of the mount employed in FIG. 7.
  • FIG. 9 is a top view of the mount of FIG. 8.
  • the lamp shown in FIG. 1 of the drawings is generally the same, except for the mount construction, as that shown in FIG. 5 of US. Pat. No. 3,506,385 to Kurt Weber and George Cressman, and comprises a tubular envelope 11, preferably made of a borosilicate glass or other suitable vitreous material such as lead glass and having a stem press seal 12 at one end thereof through which a pair of inlead wires 13, 14 extend from the ex 16 at the other end thereof from the stem press seal 12.
  • the lamp may be coated with the usual lacquer or plastic protective coating.
  • the mount 15 includes flash ignition means for igniting the combustible material 16, comprising a glass bead or other vitreous electrically insulative member 18 sealedover and around an endof the pair of lead-in or inlead wires 13 and 14.
  • An opening 19 is provided through the bead 18 and is between and in communication with both of the inlead wires 13 and 14.
  • the bead 18 may be formed by placing a ring 0f glass around the ends of the inlead wires, and heating for a suitable time at a suitable temperature so as to cause the glass ring to shrink into molten contact with the end portions of the inlead wires, leaving the slotlike or other shaped opening 19.
  • the ends of the inlead wires 13 and 14 extend only partially into the bead, as shown, and the bead material overlies the ends of the inlead wires.
  • Suitable dimensions for the bead 18 are about 0.080 inch in height, with the slot 19 being about 0.015 inch wide and about 0.040 inch long between the inlead wires 13 and 14.
  • the opening 19 is at least partially filled with primer material 21.
  • primer material 21 Various suitable primer materials are known; for example, a mixture may be prepared offlnc particles of zirconium and potassium perchlorate along with a binder such as nitrocellulose and solvent such as amyl acetate, as described in the above-mentioned Albrecht patents.
  • This binder in liquid form, is applied to the opening 19 with a syringe, or by daubing, or by dipping the inverted mount onto the surface of the liquid primer.
  • the small cross-sectional area of the opening 19, and the opening being open at both ends, causes a capillary action effect which aids in drawing the liquid primer material into the opening.
  • the binder and solvent are then dried out from the primer material 21 in the opening 19.
  • the mount is sealed in the envelope 11 prior to putting the primer 21 into the opening 19 of the bead l8, and then the combustible material 16 is positioned in the envelope above the head 18 whereby the upper end of the opening 19 is directed toward the combustible material 16, the tippedoff end 17 is necked down, the bulb is evacuated and filled in with oxygen, and then tipped off at 17.
  • the mount construction of the invention achieves several desirable advantages.
  • the top ends of the inlead wires 13 and 14, being covered over by the bead material and the primer cannot become short-circuited by being in contact with shreds of the combustible material 16.
  • the bead 18 is large enough in diameter to reduce the likelihood of strands of material 16 from extending down between the bead and inner wall of bulb 11 so as to short the inlead wires 13 and 14.
  • voltage applied to the primer 2] via the inlead wires 13 and 14 causes the primer 21 to ignite, causing a blast of sparks both upwardly and downwardly from the opening 19.
  • the upward blast of sparks is directed toward and ignites the combustible material 16, which, with the aid of the oxygen in the lamp, causes a flash of light.
  • the downward blast of sparks from the opening 19, with the aid of gravity, assures complete or substantially complete exiting of primer material from the opening 19, thus insuring an open circuit rather than a short circuit in the flashed lamp between the inlead wires 13 and 14.
  • the aforesaid downward blast of sparks is directed toward the thickened glass at the seal 12 at the bottom of the bulb, which readily withstands the blast.
  • the glass bead covering over some or all of the upper ends of the lead-in wires 13 and 14 helps to prevent particles of burned or partly burned metal of the combustible material 16 from falling against the ends of the lead-in wires and causing a short or partial short between them, and the small cross-sectional size of the opening 19 tends to prevent burned metal debris from falling into the opening 19 so as to short across the inleads 13, 14.
  • one of the lead-in wires 14 extends completely through the bead 18 and is in electrical contact with the combustion metal 16, which is desirable in certain flash lamps so that the combustion material 16 can be electrically grounded, thus reducing the possibility of accidental electrostatic flashing of the lamp.
  • a glass sleeve 23 ex tends downwardly from the bead l8 and around one of the lead-in wires 13, and functions to help prevent debris from the combustion material 16 from shorting between the lead-in wires 13 and 14 at the underside of the bead 18 after the lamp has flashed.
  • the bead 18 is shaped so as to extend downwardly and partially around each of the lead-in wires 13 and 14, for the same purpose as that of FIG. 5, Le, to help prevent debris from the combustible material 16 of the flashed lamp from shorting across the lead-in wires below the bead 18.
  • FIGS. 7, 8, and 9 The alternative embodiment of the invention shown in FIGS. 7, 8, and 9 is generally the same as that of FIGS. 1, 2, and 3, except that the opening 19 through the bead 18 is a circular tapered hole having a larger diameter toward the bottom of the bead and facing the seal 12, as shown. It will be noted that FIGS. 8 and 9 do not show primer material in the opening 19.
  • the height of the bead 18 is 0.080 inch, the smaller (upper) diameter of the opening 19 being approximately 0.024 inch, and the diameter of the larger (bottom) end of the circular opening being approximately 0.040 inch.
  • the glass or other material of the bead 18 completely covers over the upper ends of the lead-in wires 13 and 14, thus virtually assuring that no metallic debris from the flashing of the combustible material 16 will be able to fall into the opening 19 and short across the lead-in wires 13 and 14.
  • tapering the opening 19, as best shown in FIGS. 8 and 9, with the larger end downward in the lamp helps the flashing primer material debris to fall downwardly and out of the opening 19, as well as being blasted down out of the opening toward the thickened glass at the seal 12, therefore helping to insure that no substantial amount of primer material will remain in the opening 19 after flashing which could cause a short or low impedance across the lead-in wires 13 and 14, while at the same time a sufficient amount of primer blast sparks blast upwardly from the opening 19 so as to reach and ignite the combustible material 16 when the lamp is flashed.
  • the slot-like opening 19 shown in FIGS. 1-6 could also similarly be tapered so as to have a larger cross section at the bottom of the head 18 than at the top thereof.
  • the embodiment of FIGS. 7-9 can employ the modifications of FIGS. 4-6.
  • the invention achieves the objectives of providing a high-voltage flash lamp which will reliably flash, and which will reliably have an open circuit or high impedance across its lead-wires after flashing, these objectives being achieved by constructing a mount comprising a bead or other electrically insulative member provided over an end of a pair of substantially parallel lead-in wires, there being an opening through the bead between and in communication with both of the lead-in wires, the opening being filled or partially filled with primer material and being open at both ends thereof at different locations on the surface of the insulative member to the interior of the flash lamp, so that when the primer ignites it can readily blast out and exitfrom the opening at both ends thereof, thus insuring that little if any residue of the primer will remain in the opening after flashing.
  • a clear glass bead 18 having rounded sides is employed, as shown, whereupon the curved sides of the bead function as a magnifying lens for aidterial in the opening 19, the primer material 21 usually being of a black or dark color.
  • the lead-in wires 13 and 14 preferably are shaped as shown, being substantially mutually parallel and being farther apart where they enter the inside of the bulb 11 than at their upper ends at the bead 18 (which spacing at the bead is a function of desired firing breakdown voltage), thus providing more spacing between them on the bottom of the inside of the bulb and making it less likely that any falling metallic debris from the combustible material 16 which reaches the bottom of the bulb will cause a short across the lead-in wires 13 and 14.
  • Alternative inlead arrangements include bringing the ends of the inleads in through opposite sides of the bead 18.
  • a photoflash lamp of the type having a bulb and a mount comprising a pair of inleads extending within the bulb and having flash ignition means connected across said inleads within said bulb, said bulb containing combustible material ignitable by said flash ignition means, wherein said flash ignition means comprises an electrically insulative member, said inleads extending into said insulative member, an opening through said' insulative member between and in communication with both of said inleads, said opening having ends thereof at different locations on the surface of said insulative member and communicating with the interior of saidbulb, at each of said ends, and primer material contained in said opening and connected electrically across said inleads said primer material being exposed to said interiorof the bulb at both said ends of said opening.
  • a flash lamp as claimed in claim 2 in which said inleads are substantially mutually parallel and enter into the bulb through a seal region at which the bulb wall is relatively thicker than the rest of the bulb wall,
  • said opening extending substantially straight through the insulative member in a direction substantially paral- 5 lel to said inleads, the other end of said opening being directed toward said seal region.
  • a flash lamp as claimed in claim 4 in which said opening is in the shape of a slot extending between said inleads and through said insulative member.

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  • 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)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US453487A 1974-03-21 1974-03-21 Flash Lamp Mount Construction Expired - Lifetime US3884615A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US453487A US3884615A (en) 1974-03-21 1974-03-21 Flash Lamp Mount Construction
AR257889A AR204195A1 (es) 1974-03-21 1975-01-01 Lampara de destello de uso fotografico
CA217,514A CA1021587A (en) 1974-03-21 1975-01-07 Flash lamp mount construction
DE19752504188 DE2504188C3 (de) 1974-03-21 1975-02-01 Photoblitzlampe
NL7501984A NL7501984A (nl) 1974-03-21 1975-02-19 Flitslamp met een drager die een grote kortsluitweerstand verschaft.
BR1292/75A BR7501292A (pt) 1974-03-21 1975-03-05 Lampada de flash fotografico
GB945675A GB1473815A (en) 1974-03-21 1975-03-06 Flash lamps
JP50028737A JPS50126413A (cs) 1974-03-21 1975-03-11
IT21442/75A IT1034418B (it) 1974-03-21 1975-03-18 Montatura interna di lampada fotografica a lampo
SU7502115949A SU583779A3 (ru) 1974-03-21 1975-03-20 Лампа-вспышка
FR7508849A FR2265033B1 (cs) 1974-03-21 1975-03-21
BE154610A BE827007A (fr) 1974-03-21 1975-03-21 Lampe-eclair haute-tension comportant un dispositif d'amorcage perfectionne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US453487A US3884615A (en) 1974-03-21 1974-03-21 Flash Lamp Mount Construction

Publications (1)

Publication Number Publication Date
US3884615A true US3884615A (en) 1975-05-20

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ID=23800761

Family Applications (1)

Application Number Title Priority Date Filing Date
US453487A Expired - Lifetime US3884615A (en) 1974-03-21 1974-03-21 Flash Lamp Mount Construction

Country Status (11)

Country Link
US (1) US3884615A (cs)
JP (1) JPS50126413A (cs)
AR (1) AR204195A1 (cs)
BE (1) BE827007A (cs)
BR (1) BR7501292A (cs)
CA (1) CA1021587A (cs)
FR (1) FR2265033B1 (cs)
GB (1) GB1473815A (cs)
IT (1) IT1034418B (cs)
NL (1) NL7501984A (cs)
SU (1) SU583779A3 (cs)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008040A (en) * 1975-11-24 1977-02-15 Gte Sylvania Incorporated Photoflash lamp and method of making same
US4040777A (en) * 1975-04-28 1977-08-09 General Electric Company Flash lamp array having shorting lamps
US4041300A (en) * 1975-10-28 1977-08-09 General Electric Company Photoflash array with discharge path for electrostatic charges
US4049369A (en) * 1975-12-29 1977-09-20 Gte Sylvania Incorporated Photoflash lamp and multilamp unit with electrostatic protection
DE2739388A1 (de) * 1976-09-07 1978-03-09 Gte Sylvania Inc Piezoelektrisch zuendbare photoblitzlampe und methode zu ihrer herstellung
US4082494A (en) * 1976-12-08 1978-04-04 Gte Sylvania Incorporated Photoflash lamp
US4105392A (en) * 1975-11-20 1978-08-08 Gte Sylvania Incorporated Photoflash lamp
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
US4309166A (en) * 1977-12-23 1982-01-05 U.S. Philips Corporation Combustion flashbulb
EP0044551A1 (en) * 1980-07-21 1982-01-27 GTE Products Corporation Method of making a pressurized electrically-activated high-voltage photoflash lamp
EP0044552A1 (en) * 1980-07-21 1982-01-27 GTE Products Corporation Electrically-activated high-voltage photoflash lamp excluding a press-sealed end portion and method of making same
US4363622A (en) * 1978-06-20 1982-12-14 U.S. Philips Corporation Combustion flashbulb
US4388065A (en) * 1979-05-04 1983-06-14 U.S. Philips Corporation Combustion flash bulb
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768957A (en) * 1971-09-21 1973-10-30 Philips Corp Flash bulb
US3823994A (en) * 1972-02-19 1974-07-16 Philips Corp Method of making combustion flash bulb

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768957A (en) * 1971-09-21 1973-10-30 Philips Corp Flash bulb
US3823994A (en) * 1972-02-19 1974-07-16 Philips Corp Method of making combustion flash bulb

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4128858A (en) * 1975-04-14 1978-12-05 General Electric Company Multiple flashlamp system
US4040777A (en) * 1975-04-28 1977-08-09 General Electric Company Flash lamp array having shorting lamps
US4041300A (en) * 1975-10-28 1977-08-09 General Electric Company Photoflash array with discharge path for electrostatic charges
US4105392A (en) * 1975-11-20 1978-08-08 Gte Sylvania Incorporated Photoflash lamp
US4008040A (en) * 1975-11-24 1977-02-15 Gte Sylvania Incorporated Photoflash lamp and method of making same
US4049369A (en) * 1975-12-29 1977-09-20 Gte Sylvania Incorporated Photoflash lamp and multilamp unit with electrostatic protection
DE2739388A1 (de) * 1976-09-07 1978-03-09 Gte Sylvania Inc Piezoelektrisch zuendbare photoblitzlampe und methode zu ihrer herstellung
US4082494A (en) * 1976-12-08 1978-04-04 Gte Sylvania Incorporated Photoflash lamp
US4309166A (en) * 1977-12-23 1982-01-05 U.S. Philips Corporation Combustion flashbulb
US4363622A (en) * 1978-06-20 1982-12-14 U.S. Philips Corporation Combustion flashbulb
US4229161A (en) * 1979-01-02 1980-10-21 Gte Products Corporation Photoflash lamp and method of making
US4388065A (en) * 1979-05-04 1983-06-14 U.S. Philips Corporation Combustion flash bulb
EP0044551A1 (en) * 1980-07-21 1982-01-27 GTE Products Corporation Method of making a pressurized electrically-activated high-voltage photoflash lamp
EP0044552A1 (en) * 1980-07-21 1982-01-27 GTE Products Corporation Electrically-activated high-voltage photoflash lamp excluding a press-sealed end portion and method of making same
US4369556A (en) * 1980-07-21 1983-01-25 Gte Products Corporation Method of making a photoflash lamp having new lead seal structure
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

Also Published As

Publication number Publication date
FR2265033A1 (cs) 1975-10-17
SU583779A3 (ru) 1977-12-05
CA1021587A (en) 1977-11-29
JPS50126413A (cs) 1975-10-04
DE2504188A1 (de) 1975-10-02
DE2504188B2 (de) 1977-03-31
GB1473815A (en) 1977-05-18
IT1034418B (it) 1979-09-10
BR7501292A (pt) 1975-12-16
FR2265033B1 (cs) 1977-11-25
AR204195A1 (es) 1975-11-28
BE827007A (fr) 1975-07-16
NL7501984A (nl) 1975-09-23

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