GB274202A - Improvements relating to the projection of light - Google Patents

Improvements relating to the projection of light

Info

Publication number
GB274202A
GB274202A GB1009326A GB1009326A GB274202A GB 274202 A GB274202 A GB 274202A GB 1009326 A GB1009326 A GB 1009326A GB 1009326 A GB1009326 A GB 1009326A GB 274202 A GB274202 A GB 274202A
Authority
GB
United Kingdom
Prior art keywords
reflectors
light
ellipsoidal
foci
coincident
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
GB1009326A
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
Original Assignee
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
Priority to GB1009326A priority Critical patent/GB274202A/en
Publication of GB274202A publication Critical patent/GB274202A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design

Abstract

274,202. Steele, L. J., and Martin, H. April 16, 1926. Optical-projection apparatus; reflector systems. - In a cinematograph projection lamp, two or more ellipsoidal or hyperboloidal reflectors truncated at their rear ends are disposed concentrically one within the other with their foci and major axes coincident, and a source of light is disposed substantiallv at the coincident foci within or at the rear of the reflectors. Fig. 2 shows two ellipsoidal reflectors a, a<1>, whilst Fig. 4 shows the hyperboloidal reflectors a, a<1>, a<2>. A relatively small refractor d or refracting system may be arranged to intercept forwardly directed rays of light which do not fall on the reflectors. An auxiliary hemispherical reflector c may be arranged at the rear of the main reflectors so as to reflect all rearwardly directed rays of light back through the light source. Alternatively, one or more separate projecting systems f, Fig. 6, having for example ellipsoidal reflectors, may be arranged to provide converging beams converging to the coincident foci of the main reflectors. Specification 267,171 is referred to in the Provisional Specification.
GB1009326A 1926-04-16 1926-04-16 Improvements relating to the projection of light Expired GB274202A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1009326A GB274202A (en) 1926-04-16 1926-04-16 Improvements relating to the projection of light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1009326A GB274202A (en) 1926-04-16 1926-04-16 Improvements relating to the projection of light

Publications (1)

Publication Number Publication Date
GB274202A true GB274202A (en) 1927-07-18

Family

ID=9961341

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1009326A Expired GB274202A (en) 1926-04-16 1926-04-16 Improvements relating to the projection of light

Country Status (1)

Country Link
GB (1) GB274202A (en)

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