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GB542508A - Improvements in or relating to optical objectives - Google Patents

Improvements in or relating to optical objectives

Info

Publication number
GB542508A
GB542508A GB1160340A GB1160340A GB542508A GB 542508 A GB542508 A GB 542508A GB 1160340 A GB1160340 A GB 1160340A GB 1160340 A GB1160340 A GB 1160340A GB 542508 A GB542508 A GB 542508A
Authority
GB
United Kingdom
Prior art keywords
component
radius
divergent
convergent
less
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
GB1160340A
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.)
Taylor Taylor and Hobson Ltd
Original Assignee
Taylor Taylor and Hobson 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 Taylor Taylor and Hobson Ltd filed Critical Taylor Taylor and Hobson Ltd
Priority to GB1160340A priority Critical patent/GB542508A/en
Publication of GB542508A publication Critical patent/GB542508A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

542,508. Lenses. TAYLOR, TAYLOR & HOBSON, Ltd., and WARMISHAM, A. July 12, 1940, No. 11603. [Class 97 (i)] In an objective comprising an asymmetrical divergent simple component behind two simple convergent components and in front of a third simple convergent component, the rear surface of the second component is convex towards the front and has a radius R, less than five times the equivalent focal length F of the objective, and the radius R. of the front surface of the divergent components is numerically greater than ten times F and is positive or negative. The radius R 4 is preferably greater than F, the radius R. of the divergent component is preferably less than one-tenth of R 5 , and the mean refractive index of the divergent component is preferably greater than 1.65. The glass of the third convergent component preferably has a mean refractive index greater than 1.62 and an AbbÚ V number less than 50. Data for two examples are set out. Specification 477,424 is referred to.
GB1160340A 1940-07-12 1940-07-12 Improvements in or relating to optical objectives Expired GB542508A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1160340A GB542508A (en) 1940-07-12 1940-07-12 Improvements in or relating to optical objectives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1160340A GB542508A (en) 1940-07-12 1940-07-12 Improvements in or relating to optical objectives

Publications (1)

Publication Number Publication Date
GB542508A true GB542508A (en) 1942-01-13

Family

ID=9989280

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1160340A Expired GB542508A (en) 1940-07-12 1940-07-12 Improvements in or relating to optical objectives

Country Status (1)

Country Link
GB (1) GB542508A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1088247B (en) * 1958-05-05 1960-09-01 Ludwig Bertele Four-element lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1088247B (en) * 1958-05-05 1960-09-01 Ludwig Bertele Four-element lens

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