GB561943A - Improvements in or relating to optical objectives - Google Patents

Improvements in or relating to optical objectives

Info

Publication number
GB561943A
GB561943A GB1403442A GB1403442A GB561943A GB 561943 A GB561943 A GB 561943A GB 1403442 A GB1403442 A GB 1403442A GB 1403442 A GB1403442 A GB 1403442A GB 561943 A GB561943 A GB 561943A
Authority
GB
United Kingdom
Prior art keywords
per cent
components
convergent
taylor
objective
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
GB1403442A
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 GB1403442A priority Critical patent/GB561943A/en
Publication of GB561943A publication Critical patent/GB561943A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
    • 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)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

561,943. Optical objectives. TAYLOR, TAYLOR, & HOBSON, Ltd:; WARMISHAM, A., and WYNNE, C. G. Oct. 6, 1942, No. 14034. Drawings to Specification. [Class 97 (i)] In an objective comprising two simple divergent components spaced between two simple convergent components, the numerical sum of the radii of the front surface of the front component and the rear surface of the rear component lies between 90 per cent and 130 per cent of the equivalent focal length F of the objective, and the overall axial length between such surfaces lies between 40 per cent and 50 per cent of F. At least one of the convergent components is of material having mean refractive index between 1.7 and 1.8, the AbbÚ V number being greater than 50 and preferably below 58. All the materials used may have substantially the same relative partial dispersion and complete data are set out for two examples, wherein the convergent components are made of #-magnesium oxide crystal, both the divergent components being made of sodium bromide crystal or of extra dense flint glass. Specification 561,804 is referred to.
GB1403442A 1942-10-06 1942-10-06 Improvements in or relating to optical objectives Expired GB561943A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1403442A GB561943A (en) 1942-10-06 1942-10-06 Improvements in or relating to optical objectives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1403442A GB561943A (en) 1942-10-06 1942-10-06 Improvements in or relating to optical objectives

Publications (1)

Publication Number Publication Date
GB561943A true GB561943A (en) 1944-06-12

Family

ID=10033803

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1403442A Expired GB561943A (en) 1942-10-06 1942-10-06 Improvements in or relating to optical objectives

Country Status (1)

Country Link
GB (1) GB561943A (en)

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