GB608586A - Improvements in or relating to optical sighting devices such as telescopes and periscopes - Google Patents

Improvements in or relating to optical sighting devices such as telescopes and periscopes

Info

Publication number
GB608586A
GB608586A GB2257/45A GB225745A GB608586A GB 608586 A GB608586 A GB 608586A GB 2257/45 A GB2257/45 A GB 2257/45A GB 225745 A GB225745 A GB 225745A GB 608586 A GB608586 A GB 608586A
Authority
GB
United Kingdom
Prior art keywords
objective
eyepiece
field
telescope
image
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
GB2257/45A
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.)
Kodak Ltd
Original Assignee
Kodak 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 Kodak Ltd filed Critical Kodak Ltd
Publication of GB608586A publication Critical patent/GB608586A/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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G02B23/08—Periscopes

Abstract

608,586. Telescope systems. KODAK, Ltd. Jan. 29, 1945, No. 2257. Convention date, Nov. 20, 1943. [Class 97 (i)] To ensure a flat field in a telescope, periscope or other sighting instrument an optical system including an objective with at least eight refracting surfaces and having a negative Petzval sum and over-corrected curvature of the field produces an image viewed through an eyepiece having a positive Petzval sum and under-corrected curvature of the field matching that of the image. The negative contribution to the Petzval sum of the objective system may be supplied by the objective or by an erecting lens system. Fig. 5 shows a sighting telescope in which both the objective 80 and erecting system 81 have negative Petzval sums, the image produced thereby being curved towards the eyepiece 84 as shown. Data are given. Specifications 608,583, 608,584 and 608,585 are referred to. The Specification also refers to a telescope comprising objective and eyepiece only. The Specification as open to inspection under Sect. 91 describes also the subject-matter of Specification 608,663 and also a sighting device comprising an objective, a field lens comprising two meniscus members of equal radii with their concave surface inwards, and a relay lens of the type described in Specification 608,663 producing a flat image in the field of view of the eyepiece. This subject-matter does not appear in the Specification as accepted.
GB2257/45A 1943-11-20 1945-01-29 Improvements in or relating to optical sighting devices such as telescopes and periscopes Expired GB608586A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US608586XA 1943-11-20 1943-11-20

Publications (1)

Publication Number Publication Date
GB608586A true GB608586A (en) 1948-09-17

Family

ID=22032178

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2257/45A Expired GB608586A (en) 1943-11-20 1945-01-29 Improvements in or relating to optical sighting devices such as telescopes and periscopes

Country Status (1)

Country Link
GB (1) GB608586A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024698A (en) * 1957-01-23 1962-03-13 Watson W & Sons Ltd Optical systems in which parallax is eliminated

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024698A (en) * 1957-01-23 1962-03-13 Watson W & Sons Ltd Optical systems in which parallax is eliminated

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