GB678838A - Improvements in or relating to optical objectives - Google Patents

Improvements in or relating to optical objectives

Info

Publication number
GB678838A
GB678838A GB965050A GB965050A GB678838A GB 678838 A GB678838 A GB 678838A GB 965050 A GB965050 A GB 965050A GB 965050 A GB965050 A GB 965050A GB 678838 A GB678838 A GB 678838A
Authority
GB
United Kingdom
Prior art keywords
radius
components
lies
exceeds
refractive index
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
GB965050A
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 GB965050A priority Critical patent/GB678838A/en
Publication of GB678838A publication Critical patent/GB678838A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

Landscapes

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

Abstract

678,838. Objectives. WARMISHAM, A., and TAYLOR, TAYLOR & HOBSON, Ltd. April 10, 1951 [April 19, 1950], No. 9650/50. Class 97 (i). A corrected optical objective comprises four doublet components of which the two inner components are divergent menisci concave towards a diaphragm between them whilst the two outer components are convergent, the four internal contact surfaces all being collective and concave towards the diaphragm. In the form shown, the convergent outer elements 3, 6 of the two inner components are made of materials having substantially the same mean refractive index greater than 1.63 and the divergent inner elements 4, 5 of such components are made of materials having substantially the same mean refractive index which is greater than 1.65 and exceeds that of the convergent elements by less than 0.045. The refractive index of the front element 7 of the rear outer component exceeds that of the rear element 8 of said component by 0.05 to 0.10 and also exceeds by between 0.03 and 0.10 that of the rear element 2 of the front outer component which element has a refractive index greater than that of the front element 1 of the front outer component by between 0.02 and 0.10. The radius of curvature R<SP>5</SP> lies between 0.6 and 1 times the focal length F of the objective and the radius R<SP>8</SP> lies between 0.5F and F. Radius R<SP>2</SP> lies between 0.35F and 0.55F and the radius R<SP>3</SP> is greater than 2.5F. The radius R11 is between 0.4F and 0.7F. Radius R<SP>7</SP> is between 0.29F and 0.37F and exceeds radius R<SP>6</SP>, which radius lies between 0.20F and 0.32F.
GB965050A 1950-04-19 1950-04-19 Improvements in or relating to optical objectives Expired GB678838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB965050A GB678838A (en) 1950-04-19 1950-04-19 Improvements in or relating to optical objectives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB965050A GB678838A (en) 1950-04-19 1950-04-19 Improvements in or relating to optical objectives

Publications (1)

Publication Number Publication Date
GB678838A true GB678838A (en) 1952-09-10

Family

ID=9876090

Family Applications (1)

Application Number Title Priority Date Filing Date
GB965050A Expired GB678838A (en) 1950-04-19 1950-04-19 Improvements in or relating to optical objectives

Country Status (1)

Country Link
GB (1) GB678838A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005379A (en) * 1957-10-22 1961-10-24 Jos Schueider & Co High-speed gaussian dual objective
DE1236815B (en) * 1956-10-09 1967-03-16 Canon Camera Company Inc Photographic lens
US4671627A (en) * 1984-10-08 1987-06-09 Ricoh Company, Ltd. Gaussian lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1236815B (en) * 1956-10-09 1967-03-16 Canon Camera Company Inc Photographic lens
US3005379A (en) * 1957-10-22 1961-10-24 Jos Schueider & Co High-speed gaussian dual objective
US4671627A (en) * 1984-10-08 1987-06-09 Ricoh Company, Ltd. Gaussian lens

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