GB670605A - Improvements relating to optical lenses - Google Patents

Improvements relating to optical lenses

Info

Publication number
GB670605A
GB670605A GB320650A GB320650A GB670605A GB 670605 A GB670605 A GB 670605A GB 320650 A GB320650 A GB 320650A GB 320650 A GB320650 A GB 320650A GB 670605 A GB670605 A GB 670605A
Authority
GB
United Kingdom
Prior art keywords
indentations
grooves
oct
optical lenses
improvements relating
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
GB320650A
Inventor
Herbert Edward Holman
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB320650A priority Critical patent/GB670605A/en
Publication of GB670605A publication Critical patent/GB670605A/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)

Abstract

670,605. Lenses. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Oct. 8, 1948 [Oct. 9, 1947], No. 3206/50. Divided out of 670,575. Drawing to Specification. Class 97 (i). An optical lens comprises several sections of the same or substantially the same thickness assembled edge-to-edge, the sections being so formed with grooves or indentations and being assembled in such order as to produce a lens of the Fresnel type with grooves or indentations, on one or both surfaces thereof, whose sides differ in inclination in a systematic manner from one groove or indenation to another or from one series of grooves or indentations to another series thereof. The description is substantially identical with that in Specification 670,575.
GB320650A 1947-10-09 1947-10-09 Improvements relating to optical lenses Expired GB670605A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB320650A GB670605A (en) 1947-10-09 1947-10-09 Improvements relating to optical lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB320650A GB670605A (en) 1947-10-09 1947-10-09 Improvements relating to optical lenses

Publications (1)

Publication Number Publication Date
GB670605A true GB670605A (en) 1952-04-23

Family

ID=9753953

Family Applications (1)

Application Number Title Priority Date Filing Date
GB320650A Expired GB670605A (en) 1947-10-09 1947-10-09 Improvements relating to optical lenses

Country Status (1)

Country Link
GB (1) GB670605A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622223A (en) * 1970-01-16 1971-11-23 Brakell Products Pty Ltd Projection screens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622223A (en) * 1970-01-16 1971-11-23 Brakell Products Pty Ltd Projection screens

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