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GB1389564A - Lenses - Google Patents

Lenses

Info

Publication number
GB1389564A
GB1389564A GB751072A GB751072A GB1389564A GB 1389564 A GB1389564 A GB 1389564A GB 751072 A GB751072 A GB 751072A GB 751072 A GB751072 A GB 751072A GB 1389564 A GB1389564 A GB 1389564A
Authority
GB
United Kingdom
Prior art keywords
focal length
convergent
parts
lens
divergent element
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
GB751072A
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 GB751072A priority Critical patent/GB1389564A/en
Priority to NL7301679A priority patent/NL181054C/en
Priority to JP48019127A priority patent/JPS4897550A/ja
Priority to DE19732307598 priority patent/DE2307598A1/en
Priority to FR7305689A priority patent/FR2172415B1/fr
Priority to US497694A priority patent/US3922072A/en
Publication of GB1389564A publication Critical patent/GB1389564A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/002—Magnifying glasses
    • G02B25/004—Magnifying glasses having binocular arrangement

Landscapes

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

Abstract

1389564 Biocular magnifying lens PILKINGTON P E Ltd 26 Jan 1973 [17 Feb 1972] 7510/72 Heading G2J A biocular magnifying lens faster than f/1.0 has a front part, a middle part and a back part, the front part being convergent and having a focal length between + 2.5F and + 8.0F (where F is the focal length of the complete lens); like middle part being convergent and having a focal length between + 1.6F and + 4.5F, there being a divergent element included in at least one of the first and middle parts and in which the back part comprises a component convex to the front and in which lens spherical aberration introduced by convergent elements is corrected by the front surface(s) of the divergent element(s), astigmatism is controlled by the spacing between the middle and back parts and the parts are arranged to effect cornia correction. Optical data are given.
GB751072A 1972-02-17 1972-02-17 Lenses Expired GB1389564A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB751072A GB1389564A (en) 1972-02-17 1972-02-17 Lenses
NL7301679A NL181054C (en) 1972-02-17 1973-02-07 ENLARGING LENS, WHICH MAKES BOTH EYES AND IS FASTER THAN F / 1.0, IN PARTICULAR OCULAR FOR NIGHT VISION DEVICES.
JP48019127A JPS4897550A (en) 1972-02-17 1973-02-16
DE19732307598 DE2307598A1 (en) 1972-02-17 1973-02-16 BIOCULAR ENLARGEMENT SYSTEM
FR7305689A FR2172415B1 (en) 1972-02-17 1973-02-16
US497694A US3922072A (en) 1972-02-17 1974-08-15 Biocular magnifying lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB751072A GB1389564A (en) 1972-02-17 1972-02-17 Lenses

Publications (1)

Publication Number Publication Date
GB1389564A true GB1389564A (en) 1975-04-03

Family

ID=9834512

Family Applications (1)

Application Number Title Priority Date Filing Date
GB751072A Expired GB1389564A (en) 1972-02-17 1972-02-17 Lenses

Country Status (5)

Country Link
JP (1) JPS4897550A (en)
DE (1) DE2307598A1 (en)
FR (1) FR2172415B1 (en)
GB (1) GB1389564A (en)
NL (1) NL181054C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322135A (en) 1978-11-29 1982-03-30 Pilkington P. E. Limited Optical apparatus
US4392710A (en) 1979-11-22 1983-07-12 Pilkington P. E. Limited Optical apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2535860B1 (en) * 1982-11-10 1986-02-28 Trt Telecom Radio Electr BIOCULAR MAGNIFIER

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1478704A (en) * 1921-08-13 1923-12-25 Zeiss Carl Fa Ocular

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322135A (en) 1978-11-29 1982-03-30 Pilkington P. E. Limited Optical apparatus
US4392710A (en) 1979-11-22 1983-07-12 Pilkington P. E. Limited Optical apparatus

Also Published As

Publication number Publication date
DE2307598A1 (en) 1973-08-23
FR2172415A1 (en) 1973-09-28
JPS4897550A (en) 1973-12-12
NL7301679A (en) 1973-08-21
FR2172415B1 (en) 1977-07-22
NL181054B (en) 1987-01-02
NL181054C (en) 1987-06-01

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19930124