US3630650A - Flashlamp and apparatus for making same - Google Patents

Flashlamp and apparatus for making same Download PDF

Info

Publication number
US3630650A
US3630650A US18875A US3630650DA US3630650A US 3630650 A US3630650 A US 3630650A US 18875 A US18875 A US 18875A US 3630650D A US3630650D A US 3630650DA US 3630650 A US3630650 A US 3630650A
Authority
US
United States
Prior art keywords
shreds
foil
flashlamp
bulb
length
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
US18875A
Other languages
English (en)
Inventor
Peter Kaufmann
Reinhold Liepert
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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
Priority claimed from DE19691913417 external-priority patent/DE1913417C3/de
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Application granted granted Critical
Publication of US3630650A publication Critical patent/US3630650A/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

  • the radius of curvature of the bends is preferably smaller than 0.3 mm. and the angle formed by an individual bend is preferably smaller than 60.
  • the cross section of the ball formed by a shred of 100 mm. in length is from 40 to 8 mm?, preferably from 30 to l2 mm?. A light gain exceeding 40 percent and a longer peak time is obtained.
  • FIG. 1 A first figure.
  • This invention relates to flashlamps, and more particularly to f'lashlamps for photographic uses having a bulb of small volume, preferably below l cc., which contains combustible material of filamentary, twisted or crumpled shreds of metal foil therein.
  • Lamps of this type are required to give off a large quantity of light in a short period of time.
  • the period of time between application of the ignition voltage and attainment of the peak value of light output, the so-called peak time, should be in the range of about I3 msec. in compliance with international conventions.
  • This requirement imposes special restriction with respect to the quantity of the combustion-supporting medium (generally oxygen) and the type of combustible material within the bulb of the lamp.
  • the combustible material extends within the bulb and on the bulb wall in relatively large, arbitrarily shaped loops.
  • the peak time (that is, the time until attainment of the peak light value) is generally considerably below the generally fixed time of 13 msec. This is mainly true for bulbs of small volume and highfill pressure.
  • the main object of the present invention is to provide a flashlamp having improved performance and having a llonger peak time with a given amount of combustible material.
  • a flashlamp comprising a bulb of small volume, preferably below l cc.; contains combustible material of filamentary, twisted or crumpled shreds of metal foil which is sharply bent, such as by buckling.
  • Each foil has from eight to 50 bends and preferably from 12 to 30 bends per 100 mm. of length of the foil shreds.
  • the foil shreds have a cross-sectional area of from 2 to 10X104 mm.2
  • the sharply bent shreds thereby form a ball with a cross-sectional area of from 40 to 8 mm?, and preferably from 30 to l2 mm.2 per 100 mm. of shred length.
  • the sharp bends in the foil shreds have a radius of curvature substantially smaller than 0.3 mm. and the formed angle of an individual bend in generally less than 60 in a preferred case.
  • the deformation of the foil shreds according to the present invention has the further advantage that with a uniform distribution within the bulb, the bearing area of the combustible material on the inner surface of the bulb wall is small. 1n the prior art flashlamps large portions of the loops of combustible material are linearly abutting the bulb wall whereas in the present invention the contact of the sharply bent foil shreds with the bulb wall is more punctiform. This point contact with the bulb wall apparently promotes optimum combustion without energy losses due to extensive heat transmission to the glass, and effects also an increase in the quantity of light produced.
  • FIG. 1 is a sectional view of a fIashlamp according to the present invention
  • FIG. 2 is an enlarged sectional view of a portion of a prior art fiashlamp with a conventional foil filling
  • FIG. 3 is an enlarged sectional view of a portion of a flashlamp with a foil filling according to the present invention
  • FIGS. 4a-4c show various illustrations of the ball formation as a function of the number of sharp bends for a foil shred.
  • FIG. 5 illustrates a device for fabricating the sharply bent foil shreds when producing a lamp according to the present invention.
  • the lamp illustrated in FIG. l comprises a tubular bulb l having an outer diameter of 6.3 mm., an internal length of l5 mm., and a volume of 0.2 cc., the bulb l being coated with a varnish coat 2 as a protection from shattering.
  • the filling 3 comprises 14 mg. of zirconium in the form of foil shreds 4 having a length of mm., a width of 32 y., and a thickness of 20 p..
  • Each individual foil shred 4 has about 27 sharp bends therein, the radius of curvature of each individual bend being smaller than 0.3 mm., and the formed angle for each bend being less than 60.
  • Each of the bent shreds 4 forms substantially a ball, each ball having a cross-sectional area of approximately l5 mm.2
  • the lamp is filled with oxygen at a pressure of 18 atm.
  • the f'lashlamp uses conventional ignition means 5, and conventional leads 6 and 7 coupled to the ignition means 5.
  • FIG. 2 shows in the prior art flashlamps, the relatively large loops of shredded foil filling 4 which often linearly abut the bulb wall l.
  • FIG. 3 shows the sharply bent structure of foil shreds 4 according to the present invention and their substantially punctiform contact with the bulb wall 1.
  • FIGS. 4a-c illustrate respectively individual foil shreds in the hitherto conventional form, shreds of the present invention with 13 bends and shreds of the present invention with 28 sharp bends.
  • the conventionally bent foil shreds of FIG. 4a are distributed in loops over a large area.
  • FIGS. 4b and 4c show the reduced cross sections-formed by means of increasing the number of sharp bends in the shreds which form the balls in accordance with the present invention.
  • FIG. 5 illustrates apparatus for producing the flashlamp of the present invention.
  • the foil shreds 4 supplied via tube 8 are sucked in by an airflow of about 3 atm. and are fed to a conduit such as tube 9.
  • the foil shreds 4 are accelerated in tube 9 and flung against the wall of chamber l0.
  • the shreds 4 are buckled by the impact against the wall of chamber 10 and are then flung by an airflow of from 2 to 3 atm. perpendicular to the original direction of flow against the wall of a second chamber l2 via acceleration conduit or tube Il to thereby form the final sharp bends.
  • the sharply bent shreds are passed through the conduit or tube 13 into the lamp bulb l which is mounted at the end of the tube 13.
  • the lamp bulb is then evacuated and/or filled with the appropriate gases and is sealed off as is well known in the art (see for example, U.S. Pat Nos. 2,347,046 and 3,120,694).
  • the peak time is l2 msec. and the generated quantity of light 3,500 lumens.
  • the relative values are l0 msec. and 3,100 lumens.
  • relative values of only 8 msec. and 2,500 lumens were attained.
  • a light output gain of 40 percent is attained with lamps according to the present invention as compared with the known conventional lamps, without increasing the amount of combustible material within the bulb.
  • the peak time is increased with the present invention.
  • a flashlamp comprising a bulb of small volume and combustible material of filamentary shreds of metal foil distributed therein;
  • said foil shreds have a cross section area of from 2 to 10X10 '4 mm?, have from eight to S0 sharp bends per 100 mm. of length of a radius of curvature less than 0.3 mm., and a bend angle less than 60; and approximately form a ball with a cross-sectional area of from 40 to 8 mm?, per 100 mm. of shred length.
  • a flashlamp according to claim l wherein said foil shreds have from l2 to 30 sharp bends per 100 mm. of length and approximately form a ball with a cross-sectional area of from 30 to l2 mm.2 per 100 mm. of shred length.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Treatment Of Fiber Materials (AREA)
US18875A 1969-03-17 1970-03-12 Flashlamp and apparatus for making same Expired - Lifetime US3630650A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691913417 DE1913417C3 (de) 1969-03-17 Blitzlampe

Publications (1)

Publication Number Publication Date
US3630650A true US3630650A (en) 1971-12-28

Family

ID=5728360

Family Applications (2)

Application Number Title Priority Date Filing Date
US18875A Expired - Lifetime US3630650A (en) 1969-03-17 1970-03-12 Flashlamp and apparatus for making same
US00189037A Expired - Lifetime US3739441A (en) 1969-03-17 1971-10-13 Apparatus and method to fill flashlamps

Family Applications After (1)

Application Number Title Priority Date Filing Date
US00189037A Expired - Lifetime US3739441A (en) 1969-03-17 1971-10-13 Apparatus and method to fill flashlamps

Country Status (8)

Country Link
US (2) US3630650A (enrdf_load_stackoverflow)
AT (1) AT306508B (enrdf_load_stackoverflow)
BE (1) BE747426A (enrdf_load_stackoverflow)
CH (1) CH507474A (enrdf_load_stackoverflow)
FR (1) FR2035002B1 (enrdf_load_stackoverflow)
GB (1) GB1266256A (enrdf_load_stackoverflow)
NL (1) NL7003086A (enrdf_load_stackoverflow)
SE (1) SE349652B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770362A (en) * 1971-12-23 1973-11-06 Gte Sylvania Inc Moisture indicator for photoflash lamp
US3792957A (en) * 1972-06-26 1974-02-19 Gte Sylvania Inc Photoflash lamp
US3817683A (en) * 1971-02-05 1974-06-18 Gen Electric Photoflash lamps
US3822109A (en) * 1972-11-21 1974-07-02 Gte Sylvania Inc Photoflash lamp
US4421493A (en) * 1982-03-01 1983-12-20 Gte Products Corporation Method of making photoflash lamp
US4445847A (en) * 1982-05-26 1984-05-01 Gte Products Corporation Photoflash lamp
US4449950A (en) * 1982-03-01 1984-05-22 Gte Products Corporation Method of making photoflash lamp to prevent shred migration into tip portion of lamp envelope during sealing thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7311779A (nl) * 1973-08-28 1975-03-04 Philips Nv Werkwijze tot het vervaardigen van een flitslamp.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162847A (en) * 1935-04-26 1939-06-20 Philips Nv Flash lamp
US3045460A (en) * 1960-04-27 1962-07-24 Sylvania Electric Prod Photoflash lamp
US3158014A (en) * 1962-12-28 1964-11-24 Sylvania Electric Prod Photoflash lamp
US3228216A (en) * 1963-05-29 1966-01-11 Sylvania Electric Prod Photoflash lamp

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2772703A (en) * 1950-10-26 1956-12-04 Sylvania Electric Prod Method and apparatus for filling flashbulbs
US3120694A (en) * 1960-08-10 1964-02-11 Gen Electric Method and apparatus for loading flash lamps with filamentary combustible material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162847A (en) * 1935-04-26 1939-06-20 Philips Nv Flash lamp
US3045460A (en) * 1960-04-27 1962-07-24 Sylvania Electric Prod Photoflash lamp
US3158014A (en) * 1962-12-28 1964-11-24 Sylvania Electric Prod Photoflash lamp
US3228216A (en) * 1963-05-29 1966-01-11 Sylvania Electric Prod Photoflash lamp

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817683A (en) * 1971-02-05 1974-06-18 Gen Electric Photoflash lamps
US3770362A (en) * 1971-12-23 1973-11-06 Gte Sylvania Inc Moisture indicator for photoflash lamp
US3792957A (en) * 1972-06-26 1974-02-19 Gte Sylvania Inc Photoflash lamp
US3822109A (en) * 1972-11-21 1974-07-02 Gte Sylvania Inc Photoflash lamp
US4421493A (en) * 1982-03-01 1983-12-20 Gte Products Corporation Method of making photoflash lamp
US4449950A (en) * 1982-03-01 1984-05-22 Gte Products Corporation Method of making photoflash lamp to prevent shred migration into tip portion of lamp envelope during sealing thereof
US4445847A (en) * 1982-05-26 1984-05-01 Gte Products Corporation Photoflash lamp

Also Published As

Publication number Publication date
FR2035002A1 (enrdf_load_stackoverflow) 1970-12-18
AT306508B (de) 1973-04-10
US3739441A (en) 1973-06-19
FR2035002B1 (enrdf_load_stackoverflow) 1974-05-31
SE349652B (enrdf_load_stackoverflow) 1972-10-02
GB1266256A (enrdf_load_stackoverflow) 1972-03-08
DE1913417A1 (de) 1970-10-01
CH507474A (de) 1971-05-15
NL7003086A (enrdf_load_stackoverflow) 1970-09-21
DE1913417B2 (de) 1977-06-23
BE747426A (fr) 1970-08-31

Similar Documents

Publication Publication Date Title
US3630650A (en) Flashlamp and apparatus for making same
US2711051A (en) Bubble forming device
US3915623A (en) Wind-proof cigarette lighter burner
JPH10501920A (ja) 高性能蛍光ランプ装置
JP2007523450A (ja) セラミック発光管内の光の光学的制御
US3303674A (en) Flash lamp
GB1464063A (en) Low-pressure gas discharge lamp
RU2001132889A (ru) Способ изготовления элементов для дозированного выделения ртути для использования в лампах дневного света
JP3139587B2 (ja) 気流吹出口
US4347053A (en) Photographic flash device using light-emitting pyrotechnic charges
JPS61115895U (enrdf_load_stackoverflow)
GB1289013A (enrdf_load_stackoverflow)
US3817683A (en) Photoflash lamps
US3792957A (en) Photoflash lamp
US4226583A (en) Photoflash lamp with knurled foil strip
US2316348A (en) Lamp
ES360443A1 (es) Procedimiento y dispositivo para la fabricacion en continuode mechas, hilados, velos, a partir de un material termo- plastico.
US2783632A (en) Photoflash lamp and mount therefor
EP0875920A3 (en) Vehicle lamp with light-trapping dome
JPS5778765A (en) Fluorescent glow discharge lamp
JP3152141B2 (ja) 誘電体バリア放電ランプ
US2772703A (en) Method and apparatus for filling flashbulbs
US4445847A (en) Photoflash lamp
US3158014A (en) Photoflash lamp
US3895902A (en) Photoflash lamp