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FR2304094A1 - Optical viewing system with two magnifications - comprises objective, eye piece, and mobile unit with divergent and convergent lenses - Google Patents

Optical viewing system with two magnifications - comprises objective, eye piece, and mobile unit with divergent and convergent lenses

Info

Publication number
FR2304094A1
FR2304094A1 FR7508011A FR7508011A FR2304094A1 FR 2304094 A1 FR2304094 A1 FR 2304094A1 FR 7508011 A FR7508011 A FR 7508011A FR 7508011 A FR7508011 A FR 7508011A FR 2304094 A1 FR2304094 A1 FR 2304094A1
Authority
FR
France
Prior art keywords
magnifications
divergent
lens
mobile unit
viewing system
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.)
Withdrawn
Application number
FR7508011A
Other languages
French (fr)
Inventor
Jean-Michel Baluteau
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.)
Societe dOptique Precision Electronique et Mecanique SOPELEM SA
Original Assignee
Societe dOptique Precision Electronique et Mecanique SOPELEM SA
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 Societe dOptique Precision Electronique et Mecanique SOPELEM SA filed Critical Societe dOptique Precision Electronique et Mecanique SOPELEM SA
Priority to FR7508011A priority Critical patent/FR2304094A1/en
Publication of FR2304094A1 publication Critical patent/FR2304094A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The double magnifying glass is intended for high precision viewing, and comprises an objective (1) and an eyepiece (3), the latter including the image formed by the image in its focal image plane. The lens combination provides a high magnification with a low magnification, this being obtained by placing a mobile optical unit on the optical axis. This does not alter the position of the focal image plane. The optical unit comprises a first diverging lens and a second diverging lens. If the focal length of the objective is F, the power of the divergent lens is p, the power of the converging lens is kp (k negative), the ratio of the two magnifications is r and the distance apart of the two lenses is d, then (1) kp = p X 1 - d kp (1+p) =1/r and (2) p = (kd2 -2kd + k+1)/kd(1-d), where the focal length F is assumed to be unity.
FR7508011A 1975-03-14 1975-03-14 Optical viewing system with two magnifications - comprises objective, eye piece, and mobile unit with divergent and convergent lenses Withdrawn FR2304094A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7508011A FR2304094A1 (en) 1975-03-14 1975-03-14 Optical viewing system with two magnifications - comprises objective, eye piece, and mobile unit with divergent and convergent lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7508011A FR2304094A1 (en) 1975-03-14 1975-03-14 Optical viewing system with two magnifications - comprises objective, eye piece, and mobile unit with divergent and convergent lenses

Publications (1)

Publication Number Publication Date
FR2304094A1 true FR2304094A1 (en) 1976-10-08

Family

ID=9152586

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7508011A Withdrawn FR2304094A1 (en) 1975-03-14 1975-03-14 Optical viewing system with two magnifications - comprises objective, eye piece, and mobile unit with divergent and convergent lenses

Country Status (1)

Country Link
FR (1) FR2304094A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0348566A1 (en) * 1987-03-31 1990-01-03 Richard T. Schneider Spotting system for binoculars and telescopes
US5321546A (en) * 1991-09-26 1994-06-14 Olympus Optical Co., Ltd. Switching variable magnification finder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0348566A1 (en) * 1987-03-31 1990-01-03 Richard T. Schneider Spotting system for binoculars and telescopes
US5321546A (en) * 1991-09-26 1994-06-14 Olympus Optical Co., Ltd. Switching variable magnification finder

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Legal Events

Date Code Title Description
ST Notification of lapse