GB580242A - Improvements in or relating to multiple focus spectacle and like lenses - Google Patents
Improvements in or relating to multiple focus spectacle and like lensesInfo
- 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
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
Landscapes
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
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.
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)
| 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 |
-
1941
- 1941-06-27 GB GB8137/41A patent/GB580242A/en not_active Expired
Cited By (4)
| 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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