SE8703674D0 - OPTICAL SYSTEM - Google Patents

OPTICAL SYSTEM

Info

Publication number
SE8703674D0
SE8703674D0 SE8703674A SE8703674A SE8703674D0 SE 8703674 D0 SE8703674 D0 SE 8703674D0 SE 8703674 A SE8703674 A SE 8703674A SE 8703674 A SE8703674 A SE 8703674A SE 8703674 D0 SE8703674 D0 SE 8703674D0
Authority
SE
Sweden
Prior art keywords
changeable
focussing
focal length
temperature
optical system
Prior art date
Application number
SE8703674A
Other languages
Swedish (sv)
Other versions
SE8703674L (en
Inventor
J-C Perrin
Original Assignee
Trt Telecom Radio Electr
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 Trt Telecom Radio Electr filed Critical Trt Telecom Radio Electr
Publication of SE8703674D0 publication Critical patent/SE8703674D0/en
Publication of SE8703674L publication Critical patent/SE8703674L/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • 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
    • G02B15/1431—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 positive
    • G02B15/143105—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 positive arranged +-+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Eyeglasses (AREA)
  • Lenses (AREA)

Abstract

A bifocal optical infra-red system with changeable focal length, changeable temperature focussing and changeable distance focussing comprises three lenses L1, L2, L3, of which only the lens L2 must be axially displaced in order to change the focal length and/or to carry out the temperature as well as the distance focussing. <IMAGE>
SE8703674A 1986-09-23 1987-09-23 INFRAROET, BIFOCAL, OPTICAL SYSTEM SE8703674L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8613266A FR2623298B1 (en) 1986-09-23 1986-09-23 INFRARED BIFOCAL OPTICAL SYSTEM

Publications (2)

Publication Number Publication Date
SE8703674D0 true SE8703674D0 (en) 1987-09-23
SE8703674L SE8703674L (en) 1989-05-14

Family

ID=9339182

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8703674A SE8703674L (en) 1986-09-23 1987-09-23 INFRAROET, BIFOCAL, OPTICAL SYSTEM

Country Status (5)

Country Link
DE (1) DE3726355A1 (en)
FR (1) FR2623298B1 (en)
GB (1) GB8722022D0 (en)
IT (1) IT1228257B (en)
SE (1) SE8703674L (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234721C2 (en) * 1991-10-16 1995-10-19 Bodenseewerk Geraetetech Three lens lens
FR2708353A1 (en) * 1993-07-26 1995-02-03 Bertin & Cie Magnification system for an imaging device with optomechanical scanning
US5894371A (en) * 1997-06-06 1999-04-13 Alliedsignal, Inc. Focus mechanism for varifocal lens
DE19828825C2 (en) * 1998-06-27 2000-07-27 Siempelkamp Gmbh & Co Belt press, in particular double belt press
FR2910133B1 (en) 2006-12-13 2009-02-13 Thales Sa IMAGING SYSTEM IR2-IR3 BI-FIELD COMPACT
FR2910134B1 (en) * 2006-12-13 2009-02-13 Thales Sa IMAGING SYSTEM IR2-IR3 BI-FIELD COMPACT
FR2928462B1 (en) * 2008-03-04 2010-06-11 Thales Sa MIXED OPTICAL DEVICE FOR MULTI-FOCAL IMAGING AND IR CALIBRATION

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL126309C (en) * 1965-06-10
US3972592A (en) * 1974-10-18 1976-08-03 Eastman Kodak Company Zoom projection lens
GB1559514A (en) * 1976-10-02 1980-01-23 Pilkington Perkin Elmer Ltd Infra-red zoom lenses
JPS5590928A (en) * 1978-12-29 1980-07-10 Olympus Optical Co Ltd Endoscope objective lens which performs changing of magnification and focusing simultaneously

Also Published As

Publication number Publication date
GB8722022D0 (en) 2009-11-25
FR2623298A1 (en) 1989-05-19
FR2623298B1 (en) 1990-10-05
IT8721200A0 (en) 1987-07-07
SE8703674L (en) 1989-05-14
IT1228257B (en) 1991-06-05
DE3726355A1 (en) 1989-07-20

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Legal Events

Date Code Title Description
NAV Patent application has lapsed

Ref document number: 8703674-5

Effective date: 19930403