GB982520A - Improvements in optical systems - Google Patents

Improvements in optical systems

Info

Publication number
GB982520A
GB982520A GB632562A GB632562A GB982520A GB 982520 A GB982520 A GB 982520A GB 632562 A GB632562 A GB 632562A GB 632562 A GB632562 A GB 632562A GB 982520 A GB982520 A GB 982520A
Authority
GB
United Kingdom
Prior art keywords
plano
lens
convex
light absorption
optical systems
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
GB632562A
Inventor
Henry Alexandre Str Philippart
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.)
British Broadcasting Corp
Original Assignee
British Broadcasting Corp
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 British Broadcasting Corp filed Critical British Broadcasting Corp
Priority to GB632562A priority Critical patent/GB982520A/en
Publication of GB982520A publication Critical patent/GB982520A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/205—Neutral density filters

Abstract

982,520. Filters. BRITISH BROADCASTING CORPORATION. Jan. 11, 1963 [Feb.19, 1962], No. 6325/62. Heading G2J. A filter comprises a plano-convex and a plano-concave lens of the same refractive index cemented together along their curved surfaces, the material of arc lens having a higher light absorption than the other. To correct for the vignetting effect of a lens the plano-convex lens should have the higher light absorption, and to introduce a vignetting effect the plano-concave lens has the higher absorption power.
GB632562A 1962-02-19 1962-02-19 Improvements in optical systems Expired GB982520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB632562A GB982520A (en) 1962-02-19 1962-02-19 Improvements in optical systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB632562A GB982520A (en) 1962-02-19 1962-02-19 Improvements in optical systems

Publications (1)

Publication Number Publication Date
GB982520A true GB982520A (en) 1965-02-03

Family

ID=9812439

Family Applications (1)

Application Number Title Priority Date Filing Date
GB632562A Expired GB982520A (en) 1962-02-19 1962-02-19 Improvements in optical systems

Country Status (1)

Country Link
GB (1) GB982520A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121715A1 (en) * 1983-02-28 1984-10-17 Honeywell Inc. Apparatus for optical spectral filtration
EP3165872A1 (en) * 2015-11-04 2017-05-10 Hexagon Technology Center GmbH Compensation of light intensity across a line of light providing improved measuring quality

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121715A1 (en) * 1983-02-28 1984-10-17 Honeywell Inc. Apparatus for optical spectral filtration
EP3165872A1 (en) * 2015-11-04 2017-05-10 Hexagon Technology Center GmbH Compensation of light intensity across a line of light providing improved measuring quality
US10330466B2 (en) 2015-11-04 2019-06-25 Hexagon Technology Center Gmbh Compensation of light intensity across a line of light providing improved measuring quality

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