GB580242A - Improvements in or relating to multiple focus spectacle and like lenses - Google Patents

Improvements in or relating to multiple focus spectacle and like lenses

Info

Publication number
GB580242A
GB580242A GB8137/41A GB813741A GB580242A GB 580242 A GB580242 A GB 580242A GB 8137/41 A GB8137/41 A GB 8137/41A GB 813741 A GB813741 A GB 813741A GB 580242 A GB580242 A GB 580242A
Authority
GB
United Kingdom
Prior art keywords
united
lens
face
refractive index
elements
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
GB8137/41A
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.)
SERGE CLAVE
Original Assignee
SERGE CLAVE
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 SERGE CLAVE filed Critical SERGE CLAVE
Publication of GB580242A publication Critical patent/GB580242A/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

580,242. Spectacle lenses. CLAVE, S., and CLAVE, M. June 27, 1941, No. 8137. Convention date, April 4. [Class 97 (i)] A multi-focus lens comprises two or more lens elements at least one consisting of two or more pieces of glass of different refractive indices united edge to edge, the lens elements being united face to face to form a lens of which the constituent parts have a common optical axis. An element comprising glasses of refractive index n<1>, n2, Fig. 11, may be united to an element having refractive index n<1>, or two such. elements having refractive indices n<1>, n<2> and n<2>, n<3>, Fig. 13, may be united to an element having refractive index n<2>. The dividing line between the glasses may be straight or curved. The glass plates from which the elements are formed may be shaped before uniting face to face, or each may have one face shaped, the shaped faces united, and the outer surfaces subsequently ground as required. Fig. 16 (Cancelled) of the Specification open to inspection under Sect. 91 of the Acts, shows a lens having a lower prismatic portion of refractive index n<2>, the whole of the remainder of the lens having refractive index n<1>. This subject-matter does not appear in the Specification as accepted.
GB8137/41A 1941-04-04 1941-06-27 Improvements in or relating to multiple focus spectacle and like lenses Expired GB580242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR580242X 1941-04-04

Publications (1)

Publication Number Publication Date
GB580242A true GB580242A (en) 1946-09-02

Family

ID=8956647

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8137/41A Expired GB580242A (en) 1941-04-04 1941-06-27 Improvements in or relating to multiple focus spectacle and like lenses

Country Status (1)

Country Link
GB (1) GB580242A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031926A (en) * 1959-04-30 1962-05-01 Textron Inc Process of making colored multi-focal eyeglass lens
US3472581A (en) * 1966-09-26 1969-10-14 Leonard Bronstein Fused multifocal corneal contact lenses
GB2155653A (en) * 1984-03-08 1985-09-25 Bristol Alexander C Aspheric spectacle lens blank
GB2309319A (en) * 1996-01-17 1997-07-23 David Hopkins Bar prism with concave face for use on vehicle mirrors and windscreens or on spectacles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031926A (en) * 1959-04-30 1962-05-01 Textron Inc Process of making colored multi-focal eyeglass lens
US3472581A (en) * 1966-09-26 1969-10-14 Leonard Bronstein Fused multifocal corneal contact lenses
GB2155653A (en) * 1984-03-08 1985-09-25 Bristol Alexander C Aspheric spectacle lens blank
GB2309319A (en) * 1996-01-17 1997-07-23 David Hopkins Bar prism with concave face for use on vehicle mirrors and windscreens or on spectacles

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