GB1462892A - Lenses - Google Patents

Lenses

Info

Publication number
GB1462892A
GB1462892A GB4273874A GB4273874A GB1462892A GB 1462892 A GB1462892 A GB 1462892A GB 4273874 A GB4273874 A GB 4273874A GB 4273874 A GB4273874 A GB 4273874A GB 1462892 A GB1462892 A GB 1462892A
Authority
GB
United Kingdom
Prior art keywords
lens
distance
lenses
objective
spaced
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
GB4273874A
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.)
Rank Organization Ltd
Original Assignee
Rank Organization 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 Rank Organization Ltd filed Critical Rank Organization Ltd
Priority to GB4273874A priority Critical patent/GB1462892A/en
Priority to NL7511476A priority patent/NL7511476A/en
Priority to FR7530105A priority patent/FR2287050A1/en
Priority to DE19752544148 priority patent/DE2544148A1/en
Publication of GB1462892A publication Critical patent/GB1462892A/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

Landscapes

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

Abstract

1462892 Objectives RANK ORGANISATION Ltd 25 Sept 1975 [2 Oct 1974] 42738/74 Heading G2J In a three lens objective, the front lens is a positive meniscus having a convex front surface, the second lens is divergent and is spaced behind the first lens by a distance not greater than 0.35F, where F is the focal length of the whole objective, and the third lens is convergence and is spaced from the second lens by a distance of between 0.2F and 0.95F, the first and third lenses being made of silicon while the second lens is made of zinc sulphide or arsenic trisulphide. Optical data of two examples are given.
GB4273874A 1974-10-02 1974-10-02 Lenses Expired GB1462892A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB4273874A GB1462892A (en) 1974-10-02 1974-10-02 Lenses
NL7511476A NL7511476A (en) 1974-10-02 1975-09-30 OPTICAL LENS.
FR7530105A FR2287050A1 (en) 1974-10-02 1975-10-01 OPTICAL OBJECTIVE
DE19752544148 DE2544148A1 (en) 1974-10-02 1975-10-02 LENS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4273874A GB1462892A (en) 1974-10-02 1974-10-02 Lenses

Publications (1)

Publication Number Publication Date
GB1462892A true GB1462892A (en) 1977-01-26

Family

ID=10425769

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4273874A Expired GB1462892A (en) 1974-10-02 1974-10-02 Lenses

Country Status (4)

Country Link
DE (1) DE2544148A1 (en)
FR (1) FR2287050A1 (en)
GB (1) GB1462892A (en)
NL (1) NL7511476A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2181567A (en) * 1985-07-04 1987-04-23 Plessey Co Plc Infra-red fresnel lenses and methods of fabrication
CN106662729A (en) * 2014-08-07 2017-05-10 大族激光科技产业集团股份有限公司 Far infrared imaging lens set, objective lens and fire source detector

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4411488A (en) * 1980-05-30 1983-10-25 Barr & Stroud Limited Afocal zoom refractor telescopes
CH658731A5 (en) * 1982-06-25 1986-11-28 Kern & Co Ag LIGHT-EFFECTIVE LENS FOR HEAT RADIATION.
DE4234721C2 (en) * 1991-10-16 1995-10-19 Bodenseewerk Geraetetech Three lens lens
WO2007086178A1 (en) 2006-01-30 2007-08-02 Sumitomo Electric Industries, Ltd. Infrared lens, infrared camera and night vision

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2181567A (en) * 1985-07-04 1987-04-23 Plessey Co Plc Infra-red fresnel lenses and methods of fabrication
CN106662729A (en) * 2014-08-07 2017-05-10 大族激光科技产业集团股份有限公司 Far infrared imaging lens set, objective lens and fire source detector
CN106662729B (en) * 2014-08-07 2019-09-17 大族激光科技产业集团股份有限公司 Far infrared imagery lens group, object lens and fire fire detector

Also Published As

Publication number Publication date
FR2287050A1 (en) 1976-04-30
DE2544148A1 (en) 1976-04-15
NL7511476A (en) 1976-04-06

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Legal Events

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