GB558657A - Improvements in lenses - Google Patents

Improvements in lenses

Info

Publication number
GB558657A
GB558657A GB628242A GB628242A GB558657A GB 558657 A GB558657 A GB 558657A GB 628242 A GB628242 A GB 628242A GB 628242 A GB628242 A GB 628242A GB 558657 A GB558657 A GB 558657A
Authority
GB
United Kingdom
Prior art keywords
lens
equal
equation
medium
distance
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
GB628242A
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Priority to GB628242A priority Critical patent/GB558657A/en
Publication of GB558657A publication Critical patent/GB558657A/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
    • G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses

Abstract

558,657. Lenses. BURCH, C. R., and METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. May 8, 1942, No. 6282. [Class 97 (i)] A singlet lens is rendered substantially anastigmatic, and is corrected for spherical aberration and coma, by constructing it in accordance with the equation and by aspherising one or both surfaces, L being the distance in the medium of the. lens at which the image formed by the front surface is spaced from the surface, N and N<SP>1</SP> being the refractive indices respectively of the medium in which the lens is inserted and of the lens material, and the other symbols having the significances shown on the drawing. The thickness d may vary within + 10 per cent of that determined by the equation, the field may be flattened by making R equal to r, N' may be made equal to ¢( + #/s), and the distance D of the diaphragm from the pole of the front surface may be equal to
GB628242A 1942-05-08 1942-05-08 Improvements in lenses Expired GB558657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB628242A GB558657A (en) 1942-05-08 1942-05-08 Improvements in lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB628242A GB558657A (en) 1942-05-08 1942-05-08 Improvements in lenses

Publications (1)

Publication Number Publication Date
GB558657A true GB558657A (en) 1944-01-14

Family

ID=9811657

Family Applications (1)

Application Number Title Priority Date Filing Date
GB628242A Expired GB558657A (en) 1942-05-08 1942-05-08 Improvements in lenses

Country Status (1)

Country Link
GB (1) GB558657A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188167A (en) * 1986-03-19 1987-09-23 Combined Optical Ind Ltd Biaspherical lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188167A (en) * 1986-03-19 1987-09-23 Combined Optical Ind Ltd Biaspherical lens

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