GB571242A - Incandescent electric projection lamp with rectifier - Google Patents

Incandescent electric projection lamp with rectifier

Info

Publication number
GB571242A
GB571242A GB4015/42A GB401542A GB571242A GB 571242 A GB571242 A GB 571242A GB 4015/42 A GB4015/42 A GB 4015/42A GB 401542 A GB401542 A GB 401542A GB 571242 A GB571242 A GB 571242A
Authority
GB
United Kingdom
Prior art keywords
projection lamp
incandescent electric
rectifier
filament
shape
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
Application number
GB4015/42A
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.)
Pathe Cinema SA
Original Assignee
Pathe Cinema SA
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 Pathe Cinema SA filed Critical Pathe Cinema SA
Publication of GB571242A publication Critical patent/GB571242A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof
    • H01K1/325—Reflecting coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K7/00—Lamps for purposes other than general lighting
    • H01K7/02—Lamps for purposes other than general lighting for producing a narrow beam of light; for approximating a point-like source of light, e.g. for searchlight, for cinematographic projector

Landscapes

  • Optical Elements Other Than Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

571,242. Incandescent electric lamps. PATHECINEMA, ANCIENS ETABLISSEMENTS PATHE FRERES. March 26, 1942, No. 4015. Convention date, May 10, 1941. [Class 39 (ii)] A projection lamp for cinematograph work has a mirror surface 1 formed on the exterior or interior of the glass bulb of such shape as to reflect the light from the filament 5 to a point outside the bulb and so that the exposure aperture 7 may intercept the whole of the convergent beam 8. The reflecting portion may be spherical, ellipsoidal, paraboloidal or of other shape. The figure shows the first, with the filament 5 arranged beyond the focus F of the spherical surface.
GB4015/42A 1941-05-10 1942-03-26 Incandescent electric projection lamp with rectifier Expired GB571242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR929289T 1941-05-10

Publications (1)

Publication Number Publication Date
GB571242A true GB571242A (en) 1945-08-14

Family

ID=9442372

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4015/42A Expired GB571242A (en) 1941-05-10 1942-03-26 Incandescent electric projection lamp with rectifier

Country Status (3)

Country Link
CH (1) CH226779A (en)
FR (1) FR929289A (en)
GB (1) GB571242A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL260918A (en) * 1961-02-07
US3763348A (en) * 1972-01-05 1973-10-02 Argus Eng Co Apparatus and method for uniform illumination of a surface

Also Published As

Publication number Publication date
FR929289A (en) 1947-12-22
CH226779A (en) 1943-04-30

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