GB560162A - Improvements in lenses - Google Patents

Improvements in lenses

Info

Publication number
GB560162A
GB560162A GB1322842A GB1322842A GB560162A GB 560162 A GB560162 A GB 560162A GB 1322842 A GB1322842 A GB 1322842A GB 1322842 A GB1322842 A GB 1322842A GB 560162 A GB560162 A GB 560162A
Authority
GB
United Kingdom
Prior art keywords
lens
equals
refractive index
lenses
conditions
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
GB1322842A
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 GB1322842A priority Critical patent/GB560162A/en
Publication of GB560162A publication Critical patent/GB560162A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Lenses (AREA)
  • Telescopes (AREA)

Abstract

560,162. Lenses. BURCH, C. R., and METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Sept. 18, 1942, No. 13228. [Class 97 (i)] A singlet lens having a flat field and low residual astigmatism in the extended paraxial region when taking parallel light from the front is constructed so as to satisfy the conditions- R is not equal to gamma, the lens being aspherised on the back face alone to remove spherical aberration without changing the paraxial radius of curvature thereof ; in the above conditions, R r d L have the significances shown in the Figure, n equals the ratio of the refractive index N<1> of the lens material to the refractive index N of the surrounding medium, x equals d/r, and y equals L-d/R. A stop may be provided at a distance D in front of the pole of the front surface of the lens to correct for transverse chromatic abberation, the value of D being- Specification 558,657 is referred to.
GB1322842A 1942-09-18 1942-09-18 Improvements in lenses Expired GB560162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1322842A GB560162A (en) 1942-09-18 1942-09-18 Improvements in lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1322842A GB560162A (en) 1942-09-18 1942-09-18 Improvements in lenses

Publications (1)

Publication Number Publication Date
GB560162A true GB560162A (en) 1944-03-22

Family

ID=10019167

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1322842A Expired GB560162A (en) 1942-09-18 1942-09-18 Improvements in lenses

Country Status (1)

Country Link
GB (1) GB560162A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155198A (en) * 1984-02-29 1985-09-18 Konishiroku Photo Ind Objective lens for optical disk
US5365377A (en) * 1992-06-19 1994-11-15 Fuji Photo Optical Co., Ltd. Lens system
US5689373A (en) * 1995-01-19 1997-11-18 Olympus Optical Co., Ltd. Eyepiece lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155198A (en) * 1984-02-29 1985-09-18 Konishiroku Photo Ind Objective lens for optical disk
US5365377A (en) * 1992-06-19 1994-11-15 Fuji Photo Optical Co., Ltd. Lens system
US5689373A (en) * 1995-01-19 1997-11-18 Olympus Optical Co., Ltd. Eyepiece lens

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