US1935255A - Incandescent electric lamp - Google Patents

Incandescent electric lamp Download PDF

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Publication number
US1935255A
US1935255A US614741A US61474132A US1935255A US 1935255 A US1935255 A US 1935255A US 614741 A US614741 A US 614741A US 61474132 A US61474132 A US 61474132A US 1935255 A US1935255 A US 1935255A
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US
United States
Prior art keywords
lamp
incandescent electric
electric lamp
bulb
filament
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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
US614741A
Inventor
Jacob Van Eck
Fekkes Fekko
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Individual
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Individual
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Filing date
Publication date
Priority to FR736750D priority Critical patent/FR736750A/en
Priority to GB14608/32A priority patent/GB389316A/en
Application filed by Individual filed Critical Individual
Priority to US614741A priority patent/US1935255A/en
Application granted granted Critical
Publication of US1935255A publication Critical patent/US1935255A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/26—Screens; Filters

Definitions

  • the present invention consists in an incandescent electric lamp having, between the neck and the bulb, an annular reflecting portion arranged around the filament and having a concave or convex channel-shape, the surface of this portion being substantially that generated by the revolution of a parabola about the axis of the lamp.
  • the bridge element supporting the filament is of ordinary well known construction and said ele- 1 ment may be provided with a reflecting disc cooperating With said annular reflecting portion obtained by gilding, silvering or otherwise. Said reflecting portion is applied outside or inside the glass of the lamp.
  • the bulb of the lamp will pref- 16 erably have the shape of a truncated cone closed by a convex bottom, so as to secure a considerable inner volume in the lamp, for the purpose of keeping the inner temperature as low as possible and avoiding the detrimental effect of heat upon the reflecting portion.
  • the edges of said reflecting portion may be at right angles or inclined with respect to the axis of the bulb.
  • Figs. 1 and 2 are horizontal axial sections of lamps constructed in conformity with the inventlon.
  • annular channel-shaped reflecting band 3 Between the bulb l and the neck 2 is formed an annular channel-shaped reflecting band 3, either convex or concave, this portion surrounding the filament and the surface of this portion being substantially that generated by the revolution of a parabola around the axis of the lamp.
  • This portion will be gilded or silvered or made reflectant in any other way, between the planes a-a, b-b or a-a", b-b, either externally or inwardly.
  • the bridge element 4 supporting the filament 5, which is fed with current by the leads 6, will be of ordinary construction, but may be provided with a reflecting disc 7 fixed on the stem, between two rings of glass or the like soldered to said stem.
  • the bulb l will have the shape illustrated, namely that of a truncated cone of straight section and having a convex bottom so as to secure an inner volume of considerable dimension, for the purpose of keeping the temperature within the lamp so reduced that no detrimental eiiect will occur upon the reflecting portion.
  • the planes a-a, b-b, a"-a" and b'-b may be at right angles or inclined with respect to the axis of the bulb.
  • the incandescent electric lamp as described presents the advantage of securing a perfect diffusion and reflection of the light rays, so that the lighting of the illuminated surface effected by the lamp will be particularly strong.
  • parabola form constituting the generatrix of the reflecting portion may be approximately parabolic and formed eventually by a succession of straight or curved sections.
  • An incandescent electric lamp having between the neck and the bulb an annular channel-shaped reflecting portion arranged around the filament, the surface of this portion being substantially that generated by the revolution of a parabola about the axis of the lamp, the bulb having substantially the shape of a truncated cone closed by a convex bottom, and a plane reflecting disc mounted on the bridge element supporting the filament, the edge of said disc leavingan annular space between it and the neck wall, substantially o as described for the purpose set forth.

Description

NMA (Mr, QSS. VAN ECK ET AL,
INCANDESCENT ELECTRIC LAMP Filed June l, 1932 Patented Nov. 14, 1933 PATENT OFFICE INCANDESCENT ELECTRIC LAlVIP Jacob van Eck and Fekko Fekkes, Rotterdam, Netherlands Application June 1, 1932. Serial No. 614,741
1 Claim.
The present invention consists in an incandescent electric lamp having, between the neck and the bulb, an annular reflecting portion arranged around the filament and having a concave or convex channel-shape, the surface of this portion being substantially that generated by the revolution of a parabola about the axis of the lamp. The bridge element supporting the filament is of ordinary well known construction and said ele- 1 ment may be provided with a reflecting disc cooperating With said annular reflecting portion obtained by gilding, silvering or otherwise. Said reflecting portion is applied outside or inside the glass of the lamp. The bulb of the lamp will pref- 16 erably have the shape of a truncated cone closed by a convex bottom, so as to secure a considerable inner volume in the lamp, for the purpose of keeping the inner temperature as low as possible and avoiding the detrimental effect of heat upon the reflecting portion.
The edges of said reflecting portion may be at right angles or inclined with respect to the axis of the bulb.
The invention will be described hereafter in two forms of embodiment, with refrence to the accompanying drawing, in which:
Figs. 1 and 2 are horizontal axial sections of lamps constructed in conformity with the inventlon.
30 Between the bulb l and the neck 2 is formed an annular channel-shaped reflecting band 3, either convex or concave, this portion surrounding the filament and the surface of this portion being substantially that generated by the revolution of a parabola around the axis of the lamp. This portion will be gilded or silvered or made reflectant in any other way, between the planes a-a, b-b or a-a", b-b, either externally or inwardly. The bridge element 4 supporting the filament 5, which is fed with current by the leads 6, will be of ordinary construction, but may be provided with a reflecting disc 7 fixed on the stem, between two rings of glass or the like soldered to said stem. The bulb l will have the shape illustrated, namely that of a truncated cone of straight section and having a convex bottom so as to secure an inner volume of considerable dimension, for the purpose of keeping the temperature within the lamp so reduced that no detrimental eiiect will occur upon the reflecting portion. The planes a-a, b-b, a"-a" and b'-b may be at right angles or inclined with respect to the axis of the bulb.
The incandescent electric lamp as described presents the advantage of securing a perfect diffusion and reflection of the light rays, so that the lighting of the illuminated surface effected by the lamp will be particularly strong.
It is obvious that the parabola form constituting the generatrix of the reflecting portion may be approximately parabolic and formed eventually by a succession of straight or curved sections.
We claim:
An incandescent electric lamp having between the neck and the bulb an annular channel-shaped reflecting portion arranged around the filament, the surface of this portion being substantially that generated by the revolution of a parabola about the axis of the lamp, the bulb having substantially the shape of a truncated cone closed by a convex bottom, and a plane reflecting disc mounted on the bridge element supporting the filament, the edge of said disc leavingan annular space between it and the neck wall, substantially o as described for the purpose set forth.
JACOB vAN ECK. FEKKO FEKKES.
US614741A 1931-05-06 1932-06-01 Incandescent electric lamp Expired - Lifetime US1935255A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR736750D FR736750A (en) 1931-05-06 1932-05-06 Incandescent electric lamp
GB14608/32A GB389316A (en) 1931-05-06 1932-05-23 Improvements in or relating to incandescent electric lamps
US614741A US1935255A (en) 1931-05-06 1932-06-01 Incandescent electric lamp

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE736750X 1931-05-06
GB14608/32A GB389316A (en) 1931-05-06 1932-05-23 Improvements in or relating to incandescent electric lamps
US614741A US1935255A (en) 1931-05-06 1932-06-01 Incandescent electric lamp

Publications (1)

Publication Number Publication Date
US1935255A true US1935255A (en) 1933-11-14

Family

ID=10044292

Family Applications (1)

Application Number Title Priority Date Filing Date
US614741A Expired - Lifetime US1935255A (en) 1931-05-06 1932-06-01 Incandescent electric lamp

Country Status (3)

Country Link
US (1) US1935255A (en)
FR (1) FR736750A (en)
GB (1) GB389316A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901655A (en) * 1955-11-10 1959-08-25 Gen Electric Reflecting electric lamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901655A (en) * 1955-11-10 1959-08-25 Gen Electric Reflecting electric lamp

Also Published As

Publication number Publication date
FR736750A (en) 1932-11-25
GB389316A (en) 1933-03-16

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