GB361939A - Means for illuminating a surface to be projected - Google Patents

Means for illuminating a surface to be projected

Info

Publication number
GB361939A
GB361939A GB1951330A GB1951330A GB361939A GB 361939 A GB361939 A GB 361939A GB 1951330 A GB1951330 A GB 1951330A GB 1951330 A GB1951330 A GB 1951330A GB 361939 A GB361939 A GB 361939A
Authority
GB
United Kingdom
Prior art keywords
light
source
concave mirror
plane
condenser
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
GB1951330A
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.)
AEG AG
Original Assignee
Allgemeine Elektricitaets Gesellschaft
AEG AG
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 Allgemeine Elektricitaets Gesellschaft, AEG AG filed Critical Allgemeine Elektricitaets Gesellschaft
Priority to GB1951330A priority Critical patent/GB361939A/en
Publication of GB361939A publication Critical patent/GB361939A/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
    • G03B21/208—Homogenising, shaping of the illumination light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

361,939. Optical - projection systems. EVANS, W. E., 27, Chancery Lane, London.-(Allgemeine Elektricitats-Ges. ; 2, Friedrich Karl-Ufer, Berlin.) June 26, 1930, No. 19513. [Class 97 (i).] An illuminating system for use with optical projection apparatus is characterized in that the rays of light from the source of light, which are broken up in known manner, for example by a divided concave mirror, into a number of pencils of light, are superposed in the plane of the picture to be projected by a system of condensers preferably having a number of members normal to the optical axis after the real intermediate reproduction of the source of light by means of each of the mirrors and the corresponding parts of the condenser, in such manner that shadows from parts of the source of light or of the members which hold it cannot appear in the gate and upon the projection screen. As shown, e is a concave mirror which casts an image of the source of light c to infinity, the lenses g and the auxiliary condenser m forming real images at c<1>. The surface to be illuminated is situated at f<1> near the field lens o, which produces real images c<11> of the images c<1> in the plane of the objective p, which forms a real image f<11> of the picture f<1> on the projection screen q. Two prisms with equal angles may refract the pencil of light rays from each lens g into a smaller condenser m, or each pencil may be reflected by plane mirrors. The lenses g may be dispensed with by the use of a divided concave mirror in which each part is slightly turned inwards towards the source of light.
GB1951330A 1930-06-26 1930-06-26 Means for illuminating a surface to be projected Expired GB361939A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1951330A GB361939A (en) 1930-06-26 1930-06-26 Means for illuminating a surface to be projected

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1951330A GB361939A (en) 1930-06-26 1930-06-26 Means for illuminating a surface to be projected

Publications (1)

Publication Number Publication Date
GB361939A true GB361939A (en) 1931-11-26

Family

ID=10130633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1951330A Expired GB361939A (en) 1930-06-26 1930-06-26 Means for illuminating a surface to be projected

Country Status (1)

Country Link
GB (1) GB361939A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5613749A (en) * 1992-04-20 1997-03-25 Mitsubishi Denki Kabushiki Kaisha Condenser lens, polarizing element, light source apparatus, and projection display apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5613749A (en) * 1992-04-20 1997-03-25 Mitsubishi Denki Kabushiki Kaisha Condenser lens, polarizing element, light source apparatus, and projection display apparatus
US5662400A (en) * 1992-04-20 1997-09-02 Mitsubishi Denki Kabushiki Kaisha Projection display system

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