GB476734A - Improvements in optical systems for cinematograph projectors and the like - Google Patents

Improvements in optical systems for cinematograph projectors and the like

Info

Publication number
GB476734A
GB476734A GB12795/36A GB1279536A GB476734A GB 476734 A GB476734 A GB 476734A GB 12795/36 A GB12795/36 A GB 12795/36A GB 1279536 A GB1279536 A GB 1279536A GB 476734 A GB476734 A GB 476734A
Authority
GB
United Kingdom
Prior art keywords
source
curvature
optical systems
images
cylindrical
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
GB12795/36A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB476734A publication Critical patent/GB476734A/en
Expired legal-status Critical Current

Links

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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lenses (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

476,734. Optical systems. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. May 6, 1936, No. 12795. Convention date, July 27, 1935. [Class 97 (i)] A system for uniformly illuminating a circular condenser by a linear source such as a superpressure metal vapour discharge tube comprises one or more cylindrical reflecting surfaces arranged parallel with the longitudinal axis of the source so that the shortest distance from the source to the surface or surfaces is less than the radius of curvature thereof whereby the images of the source lie near it. As shown, the reflector 5 comprises two cylindrical surfaces, the centres of curvature M<1>, M" of which lie beyond the source L so that the images B<1>H, B"H are adjacent the source. As shown in Fig. 4, auxiliary spherical mirrors D having a common centre M<111 >reflect light back to the mirror S which would otherwise be lost. The mirrors may be slightly curved longitudinally and auxiliary refracting elements may be arranged between the source and the condenser. A mercury vapour tube may be employed and a single cylindrical mirror may be used.
GB12795/36A 1935-07-27 1936-05-06 Improvements in optical systems for cinematograph projectors and the like Expired GB476734A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL476734X 1935-07-27

Publications (1)

Publication Number Publication Date
GB476734A true GB476734A (en) 1937-12-06

Family

ID=19786529

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12795/36A Expired GB476734A (en) 1935-07-27 1936-05-06 Improvements in optical systems for cinematograph projectors and the like

Country Status (1)

Country Link
GB (1) GB476734A (en)

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