US2182904A - Incandescent lamp - Google Patents

Incandescent lamp Download PDF

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Publication number
US2182904A
US2182904A US148848A US14884837A US2182904A US 2182904 A US2182904 A US 2182904A US 148848 A US148848 A US 148848A US 14884837 A US14884837 A US 14884837A US 2182904 A US2182904 A US 2182904A
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US
United States
Prior art keywords
lamp
filament
light
bulb
lamps
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
US148848A
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English (en)
Inventor
Rover Wilhelm
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.)
Individual
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Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2182904A publication Critical patent/US2182904A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/14—Incandescent bodies characterised by the shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00

Definitions

  • An object of the invention is the provision of a material impervious to light and almost coman electric lamp for emergency illumination p ete y encl sin t e mp bulb except fo a Small whichis substantially invisible when viewed from portion constituting a window for passing the above a predetermined minimum height and, rays of light emitted by the filament. which can be manufactured at cheap cost.
  • the incandescent filament itself should not emitted by the filamentof an incandescent lamp be visible either from above or from lateral dimay be-reduced by reducing the temperature of rections.
  • the filament and that furthermore for a given Attempts have been made to obtain the above line voltage a' filament of greater length has a object by covering an ordinary incandescent lamp lower 7 temperature than a shorter filament of g; in a suitable manner, but apart from the fact that equal diameter and consisting of the same matethere always exists the possibility of gaps or open-. rial.
  • a coatto provide a lamp designed for normal line volting could be applied in direct contact with the age operation with means for reducing the temglass bulb of the lamp in place of a casing or en- .perature of the filament, thereby enabling it to velope and a, low voltage filament could be emprovide directly upon the bulb of the lamp a layer ployed in order to reduce the output of the lamp of lacquer impervious to light rays and insuring to such an e t nt to p v nt x s h atinshigh stability and operating safety as well as free- 40 Such low volta lamps.
  • h wev r have to be condom from the efl'ects of mechanical shocks. neet d to a lighting circuit through a In order to reduce the heating of the coating former. Moreover, apart from the fact that the of light pervjous t ria th coating may b mployment of such lamps is restricted to alte comprised of two layers, of which the inner one:
  • the d ale s would be fiector while the outer one is black and of light pelled'to keep an und a e number of pes nd absorbing character.
  • the bulb acts then, as it Sizes of l mp on Store, Snell lamps are 1500 were, similar to the spherical reflecting surface pensive to warrant their general introd i n as used in so-called Ulbricht-photometer, the wall '
  • the improved lamp forming-the subject matof which is not perceptibly heated by rays and 50 ter of the present invention is distinguished from from the window of which emanates a very unithe lamps heretofore proposed for the purpose form flux of light. in view by its great simplicity, its extreme free-
  • the invention is illustrated diasrannnatically dom from the effects of mechanical shocks and its and by way of example on the accompanying almost unlimitedlife.
  • the improved lamp has a drawing showing a section through a lamp according to the invention.
  • item B denotes the lamp bulb having the major portion of its outer surface coated with a layer L of a white lacquer upon which coating L there is another coating consisting of a black lacquer, both layers together forming a covering which is substantially impervious to light. Only the spherical cup W opposite the lamp base is left uncoated, thereby providing a window through which the light can escape. If desired, a colored filter may be arranged in front of the uncovered portion or window.
  • the filament F supported by a re-entrant portion or press P of the bulbB may be of the type known for the usual 10-watt lamps, with a diameteroi about of l millimeter, and a length about twice the length of the filament of a normal 10-watt lamp, that is consuming only- 5-watt from the same lighting source, and having a temperature amounting only to about 1600 C.
  • the computed life of such a, lamp which can be manufactured "a normal eye from for about the same price as a normal 10-watt lamp is several millions of hours so that the lamp must be considered as unusually safe in service.
  • the lamp itself and the area sufllciently illuminated by it for carrying on normal manipulations are no longer visible to distances beyond about 200 meters.
  • An incandescent lamp comprising an evacuated bulb of normally clear glass, an incandescent filament mounted therein, a coating of white lacquer applied to the exterior surface of said bulb, a Iurther coating of black lacquer impervious to light overlying said first coating, said coatings covering substantially the major portion .01 said bulb except for a small window, said fllament adapted to maintain an operating temperature below 1600 C. when fed from a lighting circult of standard voltage.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Resistance Heating (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US148848A 1936-06-18 1937-06-18 Incandescent lamp Expired - Lifetime US2182904A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE497587X 1936-06-18

Publications (1)

Publication Number Publication Date
US2182904A true US2182904A (en) 1939-12-12

Family

ID=6545199

Family Applications (1)

Application Number Title Priority Date Filing Date
US148848A Expired - Lifetime US2182904A (en) 1936-06-18 1937-06-18 Incandescent lamp

Country Status (4)

Country Link
US (1) US2182904A (en))
BE (1) BE422151A (en))
FR (1) FR823207A (en))
GB (1) GB497587A (en))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4883942A (en) * 1988-03-21 1989-11-28 Robatherm Products Low voltage heating element for portable tools
US5291380A (en) * 1991-08-17 1994-03-01 Wilhelm Koch Gmbh Lamp
DE19857076A1 (de) * 1998-12-10 2000-06-15 Volkswagen Ag Glühlampe
US20030172581A1 (en) * 2002-03-18 2003-09-18 Nosse John G. Apparatus for attracting mosquitoes and not attracting beneficial insects to electronic bug killers
WO2007098048A3 (en) * 2006-02-17 2007-10-25 Palomar Medical Tech Inc Lamp for use in a tissue treatment device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4883942A (en) * 1988-03-21 1989-11-28 Robatherm Products Low voltage heating element for portable tools
US5291380A (en) * 1991-08-17 1994-03-01 Wilhelm Koch Gmbh Lamp
DE19857076A1 (de) * 1998-12-10 2000-06-15 Volkswagen Ag Glühlampe
US20030172581A1 (en) * 2002-03-18 2003-09-18 Nosse John G. Apparatus for attracting mosquitoes and not attracting beneficial insects to electronic bug killers
US6860061B2 (en) * 2002-03-18 2005-03-01 University Of Delaware Apparatus for attracting mosquitoes and not attracting beneficial insects to electronic bug killers
WO2007098048A3 (en) * 2006-02-17 2007-10-25 Palomar Medical Tech Inc Lamp for use in a tissue treatment device

Also Published As

Publication number Publication date
GB497587A (en) 1938-12-19
FR823207A (fr) 1938-01-17
BE422151A (en))

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