GB677802A - Improvements in optical eye-pieces, particularly for wide angles - Google Patents

Improvements in optical eye-pieces, particularly for wide angles

Info

Publication number
GB677802A
GB677802A GB21893/50A GB2189350A GB677802A GB 677802 A GB677802 A GB 677802A GB 21893/50 A GB21893/50 A GB 21893/50A GB 2189350 A GB2189350 A GB 2189350A GB 677802 A GB677802 A GB 677802A
Authority
GB
United Kingdom
Prior art keywords
eye
component
curvature
radius
towards
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
GB21893/50A
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.)
Leica Geosystems AG
Original Assignee
Wild Heerbrugg AG
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 Wild Heerbrugg AG filed Critical Wild Heerbrugg AG
Publication of GB677802A publication Critical patent/GB677802A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/001—Eyepieces

Landscapes

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

Abstract

677,802. Optical systems. VERKAUFSAKT. - GES. H. WILD'S GEODATISCHE, INSTRUMENTE. Sept. 5, 1950 [Sept. 20. 1949], No. 21893/50. Class 97 (i). An eye-piece consisting of at least four airseparated lens components of which the last (nearest the eye) is a meniscus concave towards the eye and the first component (next to the field diaphragm) contains a diverging cemented surface convex towards the eye and with a radius of curvature not exceeding 0.75 of the diameter of the field diaphragm is characterized in that the last component has a diverging cemented surface concave towards the eye of which the radius of curvature is between 0.35 and 0.8 times the radius of curvature of the first surface of this component. The refractive index of the glass in front of the cemented surface of the last component may be greater than that behind the surface (towards the eye) by at least 0.04. Numerical data are given for three examples of the eye-piece shown; the objective is shown by dotted lines, and forms a real image at B where the field diaphragm is located.
GB21893/50A 1949-09-20 1950-09-05 Improvements in optical eye-pieces, particularly for wide angles Expired GB677802A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH677802X 1949-09-20

Publications (1)

Publication Number Publication Date
GB677802A true GB677802A (en) 1952-08-20

Family

ID=4528255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21893/50A Expired GB677802A (en) 1949-09-20 1950-09-05 Improvements in optical eye-pieces, particularly for wide angles

Country Status (1)

Country Link
GB (1) GB677802A (en)

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