GB902536A - Improvements in or relating to lenses - Google Patents

Improvements in or relating to lenses

Info

Publication number
GB902536A
GB902536A GB1159859A GB1159859A GB902536A GB 902536 A GB902536 A GB 902536A GB 1159859 A GB1159859 A GB 1159859A GB 1159859 A GB1159859 A GB 1159859A GB 902536 A GB902536 A GB 902536A
Authority
GB
United Kingdom
Prior art keywords
lens
principal focus
april
curvature
centre
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
GB1159859A
Inventor
John Foster Stirling
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.)
James A Jobling and Co Ltd
Original Assignee
James A Jobling and Co Ltd
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 James A Jobling and Co Ltd filed Critical James A Jobling and Co Ltd
Priority to GB1159859A priority Critical patent/GB902536A/en
Publication of GB902536A publication Critical patent/GB902536A/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)
  • Overhead Projectors And Projection Screens (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

902,536. Fresnel lenses. JOBLING & CO, Ltd., JAMES A. April 6, 1960 [April 6, 1959]. No. 11598/59. Class 97 (1). A Fresnel lens has several concentric prisms, P1, P2, &c., the hypothetical surface of each prism, which surface contains the points of intersection of incident rays emanating from the principal focus of the lens and the corresponding refracted rays, cutting a spherical surface which has the principal focus of the lens as its centre and which has the same radius of curvature as the spherical surface of the lens on the side thereof remote from the principal focus. This outer lens surface has its centre of curvature on the optical axis but displaced from the principal focus by a distance equal to 2/3 of the average thickness of the lens material. Specification 902,535 is referred to.
GB1159859A 1959-04-06 1959-04-06 Improvements in or relating to lenses Expired GB902536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1159859A GB902536A (en) 1959-04-06 1959-04-06 Improvements in or relating to lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1159859A GB902536A (en) 1959-04-06 1959-04-06 Improvements in or relating to lenses

Publications (1)

Publication Number Publication Date
GB902536A true GB902536A (en) 1962-08-01

Family

ID=9989192

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1159859A Expired GB902536A (en) 1959-04-06 1959-04-06 Improvements in or relating to lenses

Country Status (1)

Country Link
GB (1) GB902536A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523721A (en) * 1968-12-09 1970-08-11 Zeiss Jena Veb Carl Spherically corrected fresnel lenses and mirrors with partial field correction
EP0316162A2 (en) * 1987-11-12 1989-05-17 Allen L. Dr. Cohen Multifocal ophthalmic lens
GB2426075A (en) * 2005-05-12 2006-11-15 Everspring Ind Co Ltd Thin-type spherical lens having a discontinuous face
CN100447585C (en) * 2006-11-01 2008-12-31 胡允楷 New type lens, fabricating technique, and fabrication die
DE102005022636B4 (en) * 2005-05-11 2014-03-20 Everspring Industry Co. Ltd. Thin spherical lens and use of such

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523721A (en) * 1968-12-09 1970-08-11 Zeiss Jena Veb Carl Spherically corrected fresnel lenses and mirrors with partial field correction
EP0316162A2 (en) * 1987-11-12 1989-05-17 Allen L. Dr. Cohen Multifocal ophthalmic lens
EP0316162A3 (en) * 1987-11-12 1990-07-18 Allen L. Cohen Optic zone phase channels
DE102005022636B4 (en) * 2005-05-11 2014-03-20 Everspring Industry Co. Ltd. Thin spherical lens and use of such
GB2426075A (en) * 2005-05-12 2006-11-15 Everspring Ind Co Ltd Thin-type spherical lens having a discontinuous face
GB2426075B (en) * 2005-05-12 2007-12-05 Everspring Ind Co Ltd Thin-type spherical lens
CN100447585C (en) * 2006-11-01 2008-12-31 胡允楷 New type lens, fabricating technique, and fabrication die

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