GB440397A - Improvements in optical systems - Google Patents

Improvements in optical systems

Info

Publication number
GB440397A
GB440397A GB9439/34A GB943934A GB440397A GB 440397 A GB440397 A GB 440397A GB 9439/34 A GB9439/34 A GB 9439/34A GB 943934 A GB943934 A GB 943934A GB 440397 A GB440397 A GB 440397A
Authority
GB
United Kingdom
Prior art keywords
component
focal length
components
given
numerically
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
GB9439/34A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9439/34A priority Critical patent/GB440397A/en
Publication of GB440397A publication Critical patent/GB440397A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/02—Objectives
    • G02B21/025—Objectives with variable magnification
    • 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
    • G02B15/143—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 three groups only
    • G02B15/1435—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 three groups only the first group being negative
    • G02B15/143507—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 three groups only the first group being negative arranged -++

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Lenses (AREA)

Abstract

440,397. Lenses. CHRETIEN, H., 4, Rue Pigache, Saint Cloud, Seine-et-Oise, France. March 26, 1934, No. 9439. Void [Abridged as open to inspection under Sect. 91 of the Acts, Sept. 26, 1934]. [Class 97 (i)] A lens system for photography or projection comprises a divergent component D and two convergent components C, C<1>, each component being corrected as regards spherical and chromatic aberrations for an object at infinity and the component D being on the longer conjugate side of the system. The system is particularly intended as an objective of which the focal length can be varied by displacing the components C, C<1> relatively to the component D and to each other, the displacements being so related that the image plane remains fixed for a given position of the object. The focal length of the component D is numerically equal to the mean of the maximum and minimum values of the focal length of the system. The components C, C<1> are preferably'identical and have a focal length which is numerically greater than that of the component D. Constructional data are given.
GB9439/34A 1934-03-26 1934-03-26 Improvements in optical systems Expired GB440397A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9439/34A GB440397A (en) 1934-03-26 1934-03-26 Improvements in optical systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9439/34A GB440397A (en) 1934-03-26 1934-03-26 Improvements in optical systems

Publications (1)

Publication Number Publication Date
GB440397A true GB440397A (en) 1935-12-30

Family

ID=9871983

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9439/34A Expired GB440397A (en) 1934-03-26 1934-03-26 Improvements in optical systems

Country Status (1)

Country Link
GB (1) GB440397A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741155A (en) * 1951-09-11 1956-04-10 Watson W & Sons Ltd Variable magnification optical systems
US2959101A (en) * 1957-09-20 1960-11-08 Bell & Howell Co Optical objective of variable equivalent focal length
US2997919A (en) * 1960-03-28 1961-08-29 Bausch & Lomb Variable power objective
US3030861A (en) * 1959-06-29 1962-04-24 Bausch & Lomb Variable power optical system for microscopes
US3034404A (en) * 1958-11-13 1962-05-15 Paillard Sa Variable focal objectives
US3286592A (en) * 1961-04-22 1966-11-22 Wagner Helmut Objective with continually variable focal length and fixed image plane
US5703727A (en) * 1994-07-22 1997-12-30 Telesensory Corporation Zoom lens and magnifier utilizing the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741155A (en) * 1951-09-11 1956-04-10 Watson W & Sons Ltd Variable magnification optical systems
US2959101A (en) * 1957-09-20 1960-11-08 Bell & Howell Co Optical objective of variable equivalent focal length
US3034404A (en) * 1958-11-13 1962-05-15 Paillard Sa Variable focal objectives
US3030861A (en) * 1959-06-29 1962-04-24 Bausch & Lomb Variable power optical system for microscopes
US2997919A (en) * 1960-03-28 1961-08-29 Bausch & Lomb Variable power objective
US3286592A (en) * 1961-04-22 1966-11-22 Wagner Helmut Objective with continually variable focal length and fixed image plane
US5703727A (en) * 1994-07-22 1997-12-30 Telesensory Corporation Zoom lens and magnifier utilizing the same

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