GB219292A - Improvements in achromatic bifocal lens made of two pieces of glass - Google Patents

Improvements in achromatic bifocal lens made of two pieces of glass

Info

Publication number
GB219292A
GB219292A GB15726/24A GB1572624A GB219292A GB 219292 A GB219292 A GB 219292A GB 15726/24 A GB15726/24 A GB 15726/24A GB 1572624 A GB1572624 A GB 1572624A GB 219292 A GB219292 A GB 219292A
Authority
GB
United Kingdom
Prior art keywords
glass
achromatic
index
pieces
lens made
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
GB15726/24A
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.)
FRANKLIN OPTICAL Co
Original Assignee
FRANKLIN OPTICAL Co
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 FRANKLIN OPTICAL Co filed Critical FRANKLIN OPTICAL Co
Publication of GB219292A publication Critical patent/GB219292A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive

Abstract

219,292. Franklin Optical Co., (Assignees of Bugbee, L. TV.). July 17, 1923, [Convention date]. Void [Published under Sect. 91 of the Act]. Drawings to Specification. Spectacle lenses. - Bifocal lenses are constructed with a major portion of a glass of a relatively low refractive index, and with the reading portion of a glass of relatively high refractive index. The relative dispersions of the two glasses are such that the ratio of the power of the reading portion of the major lens and the index of dispersion is the same as the power of the insert and the index of dispersion of the glass of which it is formed. The resulting lens is stated to be achromatic.
GB15726/24A 1923-07-17 1924-06-30 Improvements in achromatic bifocal lens made of two pieces of glass Expired GB219292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US219292XA 1923-07-17 1923-07-17

Publications (1)

Publication Number Publication Date
GB219292A true GB219292A (en) 1925-01-15

Family

ID=21806910

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15726/24A Expired GB219292A (en) 1923-07-17 1924-06-30 Improvements in achromatic bifocal lens made of two pieces of glass

Country Status (1)

Country Link
GB (1) GB219292A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010047846A1 (en) * 2010-09-30 2012-04-05 Carl Zeiss Vision Gmbh Optical lens, in particular for use as a spectacle lens
US9176329B2 (en) 2012-03-29 2015-11-03 Carl Zeiss Vision International Gmbh Method for designing a spectacle lens and spectacle lens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010047846A1 (en) * 2010-09-30 2012-04-05 Carl Zeiss Vision Gmbh Optical lens, in particular for use as a spectacle lens
US9417461B2 (en) 2010-09-30 2016-08-16 Carl Zeiss Vision International Gmbh Optical lens, in particular for use as a spectacle lens
DE102010047846B4 (en) * 2010-09-30 2017-11-09 Carl Zeiss Vision International Gmbh Optical lens and method of manufacturing an optical lens
US9176329B2 (en) 2012-03-29 2015-11-03 Carl Zeiss Vision International Gmbh Method for designing a spectacle lens and spectacle lens

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