US3612850A - Photoflashlamp holder - Google Patents

Photoflashlamp holder Download PDF

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Publication number
US3612850A
US3612850A US822679A US3612850DA US3612850A US 3612850 A US3612850 A US 3612850A US 822679 A US822679 A US 822679A US 3612850D A US3612850D A US 3612850DA US 3612850 A US3612850 A US 3612850A
Authority
US
United States
Prior art keywords
mass
lamp
lamps
base
photoflashlamps
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
US822679A
Other languages
English (en)
Inventor
Louis Marius Nijland
Wilem Westerveld
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 US3612850A publication Critical patent/US3612850A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/04—Combinations of cameras with non-electronic flash apparatus; Non-electronic flash units
    • G03B15/0478—Combinations of photographic apparatus with percussion type flash ignition systems
    • 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
    • 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
    • F21K5/023—Ignition devices in photo flash bulbs
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/04—Combinations of cameras with non-electronic flash apparatus; Non-electronic flash units
    • G03B15/0442—Constructional details of the flash apparatus; Arrangement of lamps, reflectors, or the like

Definitions

  • ABSTRACT A flashcube having a plurality of flashlamps, a reflector secured adjacent each lamp, and a transparent mass such as plastic surrounding and embedding each lamp for providing protection against possible explosion of the lamps.
  • the invention relates to a device such as a flashlamp unit having several photoflashlamps of the combustible type which can be ignited successively.
  • a device such as a flashlamp unit having several photoflashlamps of the combustible type which can be ignited successively.
  • the risk of explosion upon ignition of such lamps becomes therefore increasingly greater and single or multiple lacquer coatings provided on the envelope do not provide sufficient protection against glass splinters being hurled away.
  • damage of the device and of the reflectors may thus occur, in addition to other dangers from explosions.
  • An object of the invention is to prevent explosions in a reliable manner, in devices comprising several photoflashlamps of the combustible type.
  • Such small flashlamps envelope content l.25 cm and less
  • the device according to the invention may be obtained in a particularly suitable manner by embedding the photoflashlamps by molding in an acrylate resin.
  • Acrylate resins are understood to mean resins which are obtained by polymerization of acrylic acid, of methacrylic acid, or the esters of these acids such as the methyl, ethyl and butyl esters. Polymerization may be effected by addition of an organic peroxide to the relevant monomers, or by heating the monomers or exposing them to ultraviolet light.
  • the photoflashlamps are molded in an acrylic monomer, which is subsequently caused to polymerize.
  • the device according to the invention may have different shapes such as cubical, boxlike and cylindrical, and reflectors may be embedded together with the photoflashlamps. By choosing a suitable shape the device may be provided with lenticular curved surfaces to concentrate the light irradiated by the flashlamps for securing the device to a camera, a shoe or an adapter is provided.
  • FIG. 1 is a side view of a device according to the invention
  • FIG. 2 is a section taken on the line l-I of the device shown in FIG. 1.
  • a flashlamp unit is provided with four photoflashlamps of the combustible type la, lb, lc, Id a reflector of aluminum foil 2 is located behind each flashlamp, and the lower end of the device is provided with a base 3.
  • the flashlamps and the reflectors are embedded in transparent acrylate resin, and the base 3 is also formed during molding.
  • the device may be obtained as follows.
  • the lamp 1a to ld inclusive and reflectors 2 are placed in a mold. Subsequently the mold is filled up with methyl methacrylate monomer to which 0.001 to 0.1 percent by weight, usually 0.01 to 0.l percent by weight of benzoyl peroxide has been added, dependent on the desired rate of hardening.
  • methyl methacrylate monomer to which 0.001 to 0.1 percent by weight, usually 0.01 to 0.l percent by weight of benzoyl peroxide has been added, dependent on the desired rate of hardening.
  • a plasticizer for example, dibutyl phythalate may be added to the monomer.
  • the present invention particularly provides the following advantages relative to similar devices in which the photoflashlamps and reflectors are accommodated in a transparent sleeve provided with a base portion and a base.
  • This new device forms a robust unit which cannot easily be damaged and in which unlacquered photoflashlamps may be accommodated which otherwise would explode upon ignition; also lacquered lamps may be used.
  • lacquered lamps may be used.
  • the use of small to very small photoflashlamps having a large light output becomes possible in flashlamps units.
  • a photoflash device comprising a. a base,
  • each reflector comprises a piece of aluminum foil.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Road Signs Or Road Markings (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US822679A 1968-05-11 1969-05-07 Photoflashlamp holder Expired - Lifetime US3612850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6806733A NL6806733A (xx) 1968-05-11 1968-05-11

Publications (1)

Publication Number Publication Date
US3612850A true US3612850A (en) 1971-10-12

Family

ID=19803608

Family Applications (1)

Application Number Title Priority Date Filing Date
US822679A Expired - Lifetime US3612850A (en) 1968-05-11 1969-05-07 Photoflashlamp holder

Country Status (6)

Country Link
US (1) US3612850A (xx)
BE (1) BE732843A (xx)
DE (1) DE1919926A1 (xx)
FR (1) FR2008323A1 (xx)
GB (1) GB1226470A (xx)
NL (1) NL6806733A (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980877A (en) * 1975-10-01 1976-09-14 General Electric Company Photoflash array with discharge path for electrostatically charged person
US4375953A (en) * 1980-09-04 1983-03-08 Gte Products Corporation Miniature photoflash unit with encapsulated flash lamps
US4397803A (en) * 1982-01-06 1983-08-09 Gte Products Corporation Method of making a photoflash device having a radiant energy-activated disconnect switch as part of the circuitry thereof
US4497756A (en) * 1981-10-05 1985-02-05 Gte Products Corporation Method of making a photoflash article using injection molding
US4498883A (en) * 1981-10-05 1985-02-12 Gte Products Corporation Method of encapsulating a photoflash lamp using a powdered resin
US4515558A (en) * 1982-01-06 1985-05-07 Gte Products Corporation Encapsulated photoflash device having a radiant energy-activated disconnect switch as part of the circuitry thereof
US20050007030A1 (en) * 2001-11-30 2005-01-13 Hirohiko Ina Strobe apparatus and its manufacturing method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3244087A (en) * 1964-01-02 1966-04-05 Sylvania Electric Prod Photographic flashlamp unit
NL6515442A (xx) * 1965-11-27 1967-05-29
US3327105A (en) * 1964-12-14 1967-06-20 Sylvania Electric Prod Disposable multilamp photoflash unit
US3350551A (en) * 1966-03-07 1967-10-31 Cinek Films Inc Multiple flash bulb holder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3244087A (en) * 1964-01-02 1966-04-05 Sylvania Electric Prod Photographic flashlamp unit
US3327105A (en) * 1964-12-14 1967-06-20 Sylvania Electric Prod Disposable multilamp photoflash unit
NL6515442A (xx) * 1965-11-27 1967-05-29
US3350551A (en) * 1966-03-07 1967-10-31 Cinek Films Inc Multiple flash bulb holder

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980877A (en) * 1975-10-01 1976-09-14 General Electric Company Photoflash array with discharge path for electrostatically charged person
US4375953A (en) * 1980-09-04 1983-03-08 Gte Products Corporation Miniature photoflash unit with encapsulated flash lamps
US4497756A (en) * 1981-10-05 1985-02-05 Gte Products Corporation Method of making a photoflash article using injection molding
US4498883A (en) * 1981-10-05 1985-02-12 Gte Products Corporation Method of encapsulating a photoflash lamp using a powdered resin
US4397803A (en) * 1982-01-06 1983-08-09 Gte Products Corporation Method of making a photoflash device having a radiant energy-activated disconnect switch as part of the circuitry thereof
US4515558A (en) * 1982-01-06 1985-05-07 Gte Products Corporation Encapsulated photoflash device having a radiant energy-activated disconnect switch as part of the circuitry thereof
US20050007030A1 (en) * 2001-11-30 2005-01-13 Hirohiko Ina Strobe apparatus and its manufacturing method
US20070170869A1 (en) * 2001-11-30 2007-07-26 Panasonic Photo & Lighting Co., Ltd. Electronic flash unit and manufacturing method thereof
US7652434B2 (en) * 2001-11-30 2010-01-26 Panasonic Photo & Lighting Co., Ltd. Electronic flash unit and manufacturing method thereof
US8339051B2 (en) * 2001-11-30 2012-12-25 Panasonic Corporation Electronic flash unit and manufacturing method thereof

Also Published As

Publication number Publication date
DE1919926A1 (de) 1969-11-27
NL6806733A (xx) 1969-11-13
GB1226470A (xx) 1971-03-31
BE732843A (xx) 1969-11-10
FR2008323A1 (xx) 1970-01-16

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