GB1532096A - Infra red lenses - Google Patents

Infra red lenses

Info

Publication number
GB1532096A
GB1532096A GB20833/76A GB2083376A GB1532096A GB 1532096 A GB1532096 A GB 1532096A GB 20833/76 A GB20833/76 A GB 20833/76A GB 2083376 A GB2083376 A GB 2083376A GB 1532096 A GB1532096 A GB 1532096A
Authority
GB
United Kingdom
Prior art keywords
positive
lens
focal length
image plane
part composed
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
GB20833/76A
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.)
Qioptiq Ltd
Original Assignee
Pilkington PE 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 Pilkington PE Ltd filed Critical Pilkington PE Ltd
Priority to GB20833/76A priority Critical patent/GB1532096A/en
Publication of GB1532096A publication Critical patent/GB1532096A/en
Expired legal-status Critical Current

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

Landscapes

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

Abstract

1532096 Infrared zoom lenses PILKINGTON PE Ltd 19 May 1977 [20 May 1976] 20833/76 Heading G2J An infrared zoom lens comprises a first positive focusing element 1; a middle zoom part composed of a positive element 2 and a negative element 3 both of which are axially moveable in an interrelated manner; and a rear part composed of a positive element 4 and a weaker negative element 5; all the elements being transmissive in the atmospheric window between 8 and 13 microns, and the last element (5) having a greater dispersion than the penultimate element (4). In practise the last element is of Zn Se, and all the others are of Ge. The lens has a long back focal length so that scanning components can be interposed between the lens and the image plane. The image surface is curved to be compatible with a curved detector array. The design is astigmatic such that the saggital and tangential foci are spaced either side of the image plane. The example has a focal length variable between 130 and 455 units.
GB20833/76A 1977-05-19 1977-05-19 Infra red lenses Expired GB1532096A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB20833/76A GB1532096A (en) 1977-05-19 1977-05-19 Infra red lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20833/76A GB1532096A (en) 1977-05-19 1977-05-19 Infra red lenses

Publications (1)

Publication Number Publication Date
GB1532096A true GB1532096A (en) 1978-11-15

Family

ID=10152478

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20833/76A Expired GB1532096A (en) 1977-05-19 1977-05-19 Infra red lenses

Country Status (1)

Country Link
GB (1) GB1532096A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199217A (en) * 1977-06-01 1980-04-22 Pilkington P. E. Limited Infra-red optical systems
FR2545944A1 (en) * 1983-05-11 1984-11-16 Trt Telecom Radio Electr OPTICAL SYSTEM WITH MULTIPLE FIELDS, ORIENTABLE IN MORE THAN 2 P STERADIANS WITHOUT IMAGE SPEED
US5151820A (en) * 1990-05-18 1992-09-29 Gec Ferranti Defence Systems Limited Zoom lens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199217A (en) * 1977-06-01 1980-04-22 Pilkington P. E. Limited Infra-red optical systems
FR2545944A1 (en) * 1983-05-11 1984-11-16 Trt Telecom Radio Electr OPTICAL SYSTEM WITH MULTIPLE FIELDS, ORIENTABLE IN MORE THAN 2 P STERADIANS WITHOUT IMAGE SPEED
EP0127914A1 (en) * 1983-05-11 1984-12-12 Telecommunications Radioelectriques Et Telephoniques T.R.T. Multi-field panoramic viewer excluding image rotation
US5151820A (en) * 1990-05-18 1992-09-29 Gec Ferranti Defence Systems Limited Zoom lens

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee