GB969020A - Improvements in or relating to drum lenses - Google Patents

Improvements in or relating to drum lenses

Info

Publication number
GB969020A
GB969020A GB1129661A GB1129661A GB969020A GB 969020 A GB969020 A GB 969020A GB 1129661 A GB1129661 A GB 1129661A GB 1129661 A GB1129661 A GB 1129661A GB 969020 A GB969020 A GB 969020A
Authority
GB
United Kingdom
Prior art keywords
segments
drum
axis
lens
same side
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
GB1129661A
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.)
Kockums Mekaniska Verkstads AB
Original Assignee
Kockums Mekaniska Verkstads AB
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 Kockums Mekaniska Verkstads AB filed Critical Kockums Mekaniska Verkstads AB
Publication of GB969020A publication Critical patent/GB969020A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

969,020. Drum lenses. KOCKUMS MEKANISKA VERKSTADS A. B. March 28, 1961 [April 1, 1960], No. 11296/61. Heading G2J. A drum lens comprises a pair of annular segments arranged symmetrically of a plane perpendicular to the central drum axis and containing the main axis of the drum lens, the segments having their optic axes in planes parallel to the first plane and disposed on the same side thereof as the respective segments. As shown, the lens comprises two convex lens segments 9a, 9b one on either side of the optic axis 7 of the drum lens and two series of prisms 1, 2, 3 and 4, 5, 6 above and below the segments 9a and 9b respectively. The focal points of the segments 9a, 9b lie on the same side of the axis 7 as the segments and the focal distances are less than the distance from the lens profile to the axis 14 of the drum lens. A plurality of light sources may be arranged round the axis 14, two of which 10 and 16 are shown.
GB1129661A 1960-04-01 1961-03-28 Improvements in or relating to drum lenses Expired GB969020A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE320960 1960-04-01

Publications (1)

Publication Number Publication Date
GB969020A true GB969020A (en) 1964-09-09

Family

ID=20261615

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1129661A Expired GB969020A (en) 1960-04-01 1961-03-28 Improvements in or relating to drum lenses

Country Status (1)

Country Link
GB (1) GB969020A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066112A2 (en) * 1981-05-19 1982-12-08 SOCIETA ITALIANA VETRO - SIV SpA Stationary optical longitudinal refractor
EP2287641A1 (en) * 2009-08-21 2011-02-23 Mass Technology (H.K.) Ltd. Fresnel lens sheet and luminaire using the same
EP2916150A4 (en) * 2013-01-21 2016-11-30 Shenzhen Coocaa Network Technology Co Ltd Lens, led backlight module, and display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066112A2 (en) * 1981-05-19 1982-12-08 SOCIETA ITALIANA VETRO - SIV SpA Stationary optical longitudinal refractor
EP0066112A3 (en) * 1981-05-19 1983-07-27 Societa Italiana Vetro - Siv Spa Fixed refractor of asymmetrical profile ideal for concentrating solar energy on a suitable collecting surface
US4530576A (en) * 1981-05-19 1985-07-23 Societa' Italiana Vetro - Siv - S.P.A. Fixed refractor of asymmetrical profile ideal for concentrating solar energy on a suitable collecting surface
EP2287641A1 (en) * 2009-08-21 2011-02-23 Mass Technology (H.K.) Ltd. Fresnel lens sheet and luminaire using the same
EP2916150A4 (en) * 2013-01-21 2016-11-30 Shenzhen Coocaa Network Technology Co Ltd Lens, led backlight module, and display device

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