US3218832A - Photoflash lamp and method - Google Patents

Photoflash lamp and method Download PDF

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Publication number
US3218832A
US3218832A US311751A US31175163A US3218832A US 3218832 A US3218832 A US 3218832A US 311751 A US311751 A US 311751A US 31175163 A US31175163 A US 31175163A US 3218832 A US3218832 A US 3218832A
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US
United States
Prior art keywords
splinterproof
photoflash lamp
envelope
lacquer
coating
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
US311751A
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English (en)
Inventor
Seidler Karl
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
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 US3218832A publication Critical patent/US3218832A/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 present invention relates to photoflash lamps having a glass envelope and a filling of combustible material and oxygen and more particularly to a splinterproof protective coating therefor.
  • the glass envelope When a lamp is flashed, an instantaneous peak pressure is created in the envelope and the glass envelope is brought to high temperature for a short time. Because of the high superpressure at the moment of flashing, the glass envelope tends to break into pieces. In order to prevent this latter or to hold together the glass splinters, the outer or inner or both of the surfaces of the bulb are provided with a splinterproof coating of lacquer.
  • Sufiicient high strength may, however, be obtained with this material only by repeated lacquering, which repeated lacquering increases the cost of manufacture. Furthermore, a splinterproof coating made by repeated lacquering with cellulose acetate does not remain unchanged when flashed, but still shows formation of blisters, molten places, and development of smoke.
  • a photoflash lamp having a glass envelope, a filling of combustible material and oxygen at a pressure exceeding one atmosphere and a splinterproof lacquer coating which consists essentially of cellulose propionate.
  • the accompanying drawing shows a miniature photoflash lamp with an oxygen pressure exceeding one atmosphere and coated with a splinterproof lacquer coating in accordance with the invention.
  • the envelope 1 of the miniature photoflash lamp is filled with combustible material 2, e.g. with shredded zirconium foils in an oxygen atmosphere the pressure of which is higher than one atmosphere.
  • combustible material 2 e.g. with shredded zirconium foils in an oxygen atmosphere the pressure of which is higher than one atmosphere.
  • igniting device 3 which is in well known manner actuated by means of the contacts 4 being taken outwards through the seal, combustion of the filling is brought about and, thereby, the light emission.
  • the envelope is provided with a protective coating 5 consisting of a lacquer according to the invention which consists essentially of cellulose propionate.
  • the coating is applied by dipping into a solution of cellulose propionate.
  • the dipping solution contains, preferably, beside a solvent also an addition of up to 10% by weight of a softener. Dibutyl sebacate has proved to be especially good as the softener.
  • a dipping lacquer for instance is composed of by weight of a solvent, 18% by weight of cellulose propionate and 2% by weight of dibutyl sebacate.
  • the solvent for the cellulose propionate and the softener includes preferably 3 parts of a low boiling, i.e., a boiling temperature from 7577 C., material such as ethyl acetate, methanol and/or ethanol, 2 parts of an intermediate boiling, i.e., a boiling temperature from 138152 C., material such as methyl glycol acetate and 1 part of a high boiling, i.e., a boiling temperature from -170 C., material such as diacetone alcohol.
  • a low boiling i.e., a boiling temperature from 7577 C.
  • material such as ethyl acetate, methanol and/or ethanol
  • an intermediate boiling i.e., a boiling temperature from 138152 C.
  • material such as methyl glycol acetate
  • 1 part of a high boiling i.e., a boiling temperature from -170 C.
  • a very suitable dipping lacquer for obtaining, in a single dipping, suflicient splinterproof protection of the miniature photoflash lamps without any formation of blisters or any development of smoke when these lamps are flashed consists of 30% by weight ethyl acetate 14% by weight methanol 6% by weight ethanol 20% by weight methyl glycol acetate 10% by weight diacetone alcohol 18% by weight cellulose propionate 2% by weight softener dibutyl sebacate.
  • the percentages of the different solvents are, suitably, chosen in such a manner that there is obtained preferably a viscosity of 200 sec/22 C. Ford-cup 8 mm.
  • a suitable coloring substance may also be added, if desired, to the dipping lacquer.
  • a photoflash lamp comprising a glass envelope, a filling in said envelope of combustible material and oxy gen at a pressure exceeding one atmosphere, and a splinterproof protective coating on the exterior surface of the glass envelope consisting essentially of cellulose propionate.
  • a photoflash lamp comprising a glass envelope, 2. 2,868,670 1/1959 Van Laar et al 6731 filling in said envelope of combustible material and oxy- 2,927,036 3/1960 Seaver 106-181 X gen at a pressure exceeding one atmosphere, and a splin- 3,022, 53 2 19 2 Baird 7 terproof protective coating on the exterior surface of 3 0 3 112 12/19 2 Caldwell et 1 10 131 X the glass envelope consisting essentially of cellulose pro- 5 pionate and a small amount of dibutyl sebacate plasticizer.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Glass Compositions (AREA)
  • Surface Treatment Of Glass (AREA)
US311751A 1962-11-09 1963-09-26 Photoflash lamp and method Expired - Lifetime US3218832A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP30539A DE1179459B (de) 1962-11-09 1962-11-09 Splitterschutz fuer Blitzlichtlampen

Publications (1)

Publication Number Publication Date
US3218832A true US3218832A (en) 1965-11-23

Family

ID=7371960

Family Applications (1)

Application Number Title Priority Date Filing Date
US311751A Expired - Lifetime US3218832A (en) 1962-11-09 1963-09-26 Photoflash lamp and method

Country Status (4)

Country Link
US (1) US3218832A (de)
AT (1) AT242508B (de)
CH (1) CH413596A (de)
DE (1) DE1179459B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285035A (en) * 1964-06-19 1966-11-15 Gen Electric Flash lamp
US3454243A (en) * 1967-04-24 1969-07-08 Us Navy Restraining sleeve-cadre tension bar
US4076489A (en) * 1976-06-24 1978-02-28 General Electric Company Method for coating photoflash lamps

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510177A (en) * 1946-11-29 1950-06-06 Celanese Corp Hot melt coating composition
US2673162A (en) * 1950-08-01 1954-03-23 Eastman Kodak Co Stabilized lower fatty acid ester of cellulose
US2868670A (en) * 1954-02-13 1959-01-13 Philips Corp Flash lamp coating process
US2927036A (en) * 1957-04-25 1960-03-01 Iii Alton Linwood Seaver Protective coating compositions
US3022653A (en) * 1958-12-24 1962-02-27 Westinghouse Electric Corp Coated flashlamp and coating composition
US3068112A (en) * 1960-04-27 1962-12-11 Eastman Kodak Co Polymeric derivatives of bicycloheptene as stabilizers for polymer compositions

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510177A (en) * 1946-11-29 1950-06-06 Celanese Corp Hot melt coating composition
US2673162A (en) * 1950-08-01 1954-03-23 Eastman Kodak Co Stabilized lower fatty acid ester of cellulose
US2868670A (en) * 1954-02-13 1959-01-13 Philips Corp Flash lamp coating process
US2927036A (en) * 1957-04-25 1960-03-01 Iii Alton Linwood Seaver Protective coating compositions
US3022653A (en) * 1958-12-24 1962-02-27 Westinghouse Electric Corp Coated flashlamp and coating composition
US3068112A (en) * 1960-04-27 1962-12-11 Eastman Kodak Co Polymeric derivatives of bicycloheptene as stabilizers for polymer compositions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285035A (en) * 1964-06-19 1966-11-15 Gen Electric Flash lamp
US3454243A (en) * 1967-04-24 1969-07-08 Us Navy Restraining sleeve-cadre tension bar
US4076489A (en) * 1976-06-24 1978-02-28 General Electric Company Method for coating photoflash lamps

Also Published As

Publication number Publication date
DE1179459B (de) 1964-10-08
CH413596A (de) 1966-05-15
AT242508B (de) 1965-09-27

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