GB639610A - Improvements in or relating to variable magnification optical systems - Google Patents

Improvements in or relating to variable magnification optical systems

Info

Publication number
GB639610A
GB639610A GB29277/47A GB2927747A GB639610A GB 639610 A GB639610 A GB 639610A GB 29277/47 A GB29277/47 A GB 29277/47A GB 2927747 A GB2927747 A GB 2927747A GB 639610 A GB639610 A GB 639610A
Authority
GB
United Kingdom
Prior art keywords
plano
cell
carrying
image
lenses
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
GB29277/47A
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.)
W Watson and Sons Ltd
Original Assignee
W Watson and Sons 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 W Watson and Sons Ltd filed Critical W Watson and Sons Ltd
Priority to GB29277/47A priority Critical patent/GB639610A/en
Publication of GB639610A publication Critical patent/GB639610A/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
    • G02B15/144—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 four groups only
    • G02B15/1445—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 four groups only the first group being negative
    • G02B15/144507—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 four groups only the first group being negative arranged -++-

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Abstract

639,610. Optical systems. WATSON & SONS, Ltd., W., HOPKINS, H. H., and WAITT, H. Nov. 3, 1947, No. 29277. [Class 97 (i)] An optical system for producing an image of continuously variable size of an object at a fixed, distance from the system comprises two fixed negative lenses, two positive lenses which are movable therebetween along a common optical axis and adjusting means for continuously and differentially moving the positive lenses by amounts such that. the distance from the fixed lenses at which the image of said object is focused remains constant, while the size of said image is continuously varied. The system may be constructed as an attachment to fit in front of the objective of. a camera and, in the form shown, comprises a body tube 7 to the front end of which is attached, by means described in Specification 639,611, a cell 12 carrying a plano-concave lens 13 and to the rear end of which is attached a cell 14 carrying a plano-concave lens 16; adjacent the latter lens is the objective 17 of a kinematograph camera to which the system is secured by an axially slidable bracket (not shown). Slidable within the body tube 7 are telescopic tubes 22, 23 of which tube 23 supports a cell 20 carrying a plano-convex lens 18, while the inner tube 22 supports a cell 21 carrying a plano-convex lens 19. The adjusting means for differentially moving the tubes 22, 23 and the positive lenses supported thereby is described in Specification 639,612.
GB29277/47A 1947-11-03 1947-11-03 Improvements in or relating to variable magnification optical systems Expired GB639610A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB29277/47A GB639610A (en) 1947-11-03 1947-11-03 Improvements in or relating to variable magnification optical systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29277/47A GB639610A (en) 1947-11-03 1947-11-03 Improvements in or relating to variable magnification optical systems

Publications (1)

Publication Number Publication Date
GB639610A true GB639610A (en) 1950-07-05

Family

ID=10288982

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29277/47A Expired GB639610A (en) 1947-11-03 1947-11-03 Improvements in or relating to variable magnification optical systems

Country Status (1)

Country Link
GB (1) GB639610A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1108935B (en) * 1959-09-29 1961-06-15 Rodenstock Optik G Optical system with variable focal length
CN112352181A (en) * 2018-02-21 2021-02-09 派纳维景国际股份有限公司 Internally grooved cam for lens system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1108935B (en) * 1959-09-29 1961-06-15 Rodenstock Optik G Optical system with variable focal length
CN112352181A (en) * 2018-02-21 2021-02-09 派纳维景国际股份有限公司 Internally grooved cam for lens system

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