GB825684A - Optical projection apparatus - Google Patents

Optical projection apparatus

Info

Publication number
GB825684A
GB825684A GB22674/57A GB2267457A GB825684A GB 825684 A GB825684 A GB 825684A GB 22674/57 A GB22674/57 A GB 22674/57A GB 2267457 A GB2267457 A GB 2267457A GB 825684 A GB825684 A GB 825684A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
apertures
july
light
pattern
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
GB22674/57A
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.)
Askania Werke AG
Original Assignee
Askania Werke 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 Askania Werke AG filed Critical Askania Werke AG
Publication of GB825684A publication Critical patent/GB825684A/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)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)

Abstract

825,684. Optical-projection systems. ASKANIA-WERKE A. G. July 17, 1957 [July 26, 1956], No. 22674/57. Class 97(1) A system for projecting a pattern of reference lines including one or more circles, comprises a diaphragm having a corresponding pattern of light transmitting apertures smaller in area than the. opaque portions, an optical element having toroidal zones to focus light in the vicinity of the apertures and a lens to project an image of the diaphragm. In the form shown the diaphragm 4 has a central aperture 4<SP>1</SP> with concentric circular slits 4<SP>11</SP>, 4<SP>111</SP> and the condenser system comprises a member 3 having a spherical portion 3<SP>1</SP> with concentric toric portions 3<SP>11</SP>, 3<SP>111</SP>, for concentrating light from the source 1 into these apertures. The member 3 may be replaced by an opaque plate having apertures in a configuration corresponding to those in the diaphragm 4, each aperture having a reflecting, part-paraboloidal crosssection.
GB22674/57A 1956-07-26 1957-07-17 Optical projection apparatus Expired GB825684A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE825684X 1956-07-26

Publications (1)

Publication Number Publication Date
GB825684A true GB825684A (en) 1959-12-16

Family

ID=6747595

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22674/57A Expired GB825684A (en) 1956-07-26 1957-07-17 Optical projection apparatus

Country Status (1)

Country Link
GB (1) GB825684A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179484A (en) * 1985-07-18 1987-03-04 Asahi Optical Co Ltd Projection type liquid-crystal video display device using a fresnel lens
DE4138020A1 (en) * 1991-11-19 1992-04-16 Burkhard Dr Neumann Microscope system for increasing light transmission through grid - has lens raster projecting congruent light source raster in intermediate image raster to improve contrast

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179484A (en) * 1985-07-18 1987-03-04 Asahi Optical Co Ltd Projection type liquid-crystal video display device using a fresnel lens
GB2179484B (en) * 1985-07-18 1990-03-28 Asahi Optical Co Ltd Projection type liquid-crystal video display device using a fresnel lens
DE4138020A1 (en) * 1991-11-19 1992-04-16 Burkhard Dr Neumann Microscope system for increasing light transmission through grid - has lens raster projecting congruent light source raster in intermediate image raster to improve contrast

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