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GB523218A - Improvements in or relating to optical objectives - Google Patents

Improvements in or relating to optical objectives

Info

Publication number
GB523218A
GB523218A GB3768538A GB3768538A GB523218A GB 523218 A GB523218 A GB 523218A GB 3768538 A GB3768538 A GB 3768538A GB 3768538 A GB3768538 A GB 3768538A GB 523218 A GB523218 A GB 523218A
Authority
GB
United Kingdom
Prior art keywords
component
components
convergent
objective
divergent
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
GB3768538A
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 GB3768538A priority Critical patent/GB523218A/en
Publication of GB523218A publication Critical patent/GB523218A/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)
  • Eyeglasses (AREA)

Abstract

523,218. Lenses. TAYLOR, TAYLOR, & HOBSON, Ltd., and WARMISHAM, A. Dec. 29, 1938, No. 37685. Drawings to Specification. [Class 97 (i)] In a projection objective consisting of a simple double-concave asymmetrical component behind two simple convergent components and in front of a third simple convergent component, the shallow side of the divergent component being towards the front components, the mean refractive indices of at least two of the three convergent components are greater than 1.75, and that of the divergent component is greater than 1.8 ; the arithmetical sum of the radii of the front surface of the front component and the rear surface of the rear component may be greater than 1.25 times and less than 2.5 times the equivalent focal length of the objective, the radius of the front surface of the divergent component may be greater than that of the rear surface of the rear component, both such surfaces being concave towards the front, and the radius of the rear surface of the rear component may be less than 1.75 times the equivalent focal length of the objective. All three convergent components may have a mean refractive index greater than 1.75. The glasses may be as described in Specification 462,304, [Group XXIIII. Numerical data for three examples are included in the Specification. Specification 517,386 also is referred to.
GB3768538A 1938-12-29 1938-12-29 Improvements in or relating to optical objectives Expired GB523218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3768538A GB523218A (en) 1938-12-29 1938-12-29 Improvements in or relating to optical objectives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3768538A GB523218A (en) 1938-12-29 1938-12-29 Improvements in or relating to optical objectives

Publications (1)

Publication Number Publication Date
GB523218A true GB523218A (en) 1940-07-09

Family

ID=10398261

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3768538A Expired GB523218A (en) 1938-12-29 1938-12-29 Improvements in or relating to optical objectives

Country Status (1)

Country Link
GB (1) GB523218A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1268404B (en) * 1961-11-14 1968-05-16 Zeiss Carl Fa Photographic lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1268404B (en) * 1961-11-14 1968-05-16 Zeiss Carl Fa Photographic lens

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