GB381662A - Improvement in lenses - Google Patents

Improvement in lenses

Info

Publication number
GB381662A
GB381662A GB23207/31A GB2320731A GB381662A GB 381662 A GB381662 A GB 381662A GB 23207/31 A GB23207/31 A GB 23207/31A GB 2320731 A GB2320731 A GB 2320731A GB 381662 A GB381662 A GB 381662A
Authority
GB
United Kingdom
Prior art keywords
lenses
separated
doublet
class
air space
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
GB23207/31A
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.)
Kapella Ltd
Original Assignee
Kapella 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 Kapella Ltd filed Critical Kapella Ltd
Priority to GB23207/31A priority Critical patent/GB381662A/en
Publication of GB381662A publication Critical patent/GB381662A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G02B15/1421—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being positive

Abstract

381,662. Lenses. WARMISHAM, A., 1625, Hinman Avenue, Evanston, Illinois, U.S.A., and KAPELLA, Ltd., 104, Stoughton Street, Leicester. Aug. 18, 1931, No. 23207 and 27304. [Class 97 (i).] Relates to lenses comprising two separately achromatized members separated by an air space S1, the length of which can be varied in order to vary the equivalent focal length of the lens. According to the invention the focal length of the front member is numerically not substantially less than four times that of the rear member. As shown both members are convergent, the front member consisting of a doublet A and the rear member consisting of two separated components B, C, of which the former is a doublet and the latter consists of a collective element I and a dispersive element II separated by an air space III in the shape of a collective lens. Specifications 180,949, 258,092, [both in Class 97 (i), Optical systems &c.], and 361,359 are referred to.
GB23207/31A 1931-08-18 1931-08-18 Improvement in lenses Expired GB381662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB23207/31A GB381662A (en) 1931-08-18 1931-08-18 Improvement in lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23207/31A GB381662A (en) 1931-08-18 1931-08-18 Improvement in lenses

Publications (1)

Publication Number Publication Date
GB381662A true GB381662A (en) 1932-10-13

Family

ID=10191881

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23207/31A Expired GB381662A (en) 1931-08-18 1931-08-18 Improvement in lenses

Country Status (1)

Country Link
GB (1) GB381662A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3045546A (en) * 1957-10-02 1962-07-24 Taylor Taylor & Hobson Ltd Optical objectives of variable focal length
DE1301152B (en) * 1959-07-14 1969-08-14 Rank Organisation Ltd Pancratic photo lens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3045546A (en) * 1957-10-02 1962-07-24 Taylor Taylor & Hobson Ltd Optical objectives of variable focal length
DE1301152B (en) * 1959-07-14 1969-08-14 Rank Organisation Ltd Pancratic photo lens

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