GB585580A - Improvements in the manufacture of lenses from plastic materials - Google Patents
Improvements in the manufacture of lenses from plastic materialsInfo
- Publication number
- GB585580A GB585580A GB1956443A GB1956443A GB585580A GB 585580 A GB585580 A GB 585580A GB 1956443 A GB1956443 A GB 1956443A GB 1956443 A GB1956443 A GB 1956443A GB 585580 A GB585580 A GB 585580A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- monomer
- coated
- polymers
- film
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0073—Optical laminates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Mechanical Engineering (AREA)
Abstract
A solid transparent core of thermoplastic material, and of form and dimensions closely approaching those of the desired finished lens, is coated with a liquid or semi-liquid film of transparent thermoplastic material or of transparent thermosetting abrasion - resisting material, and the coated core is moulded in dies having optically-accurate surfaces. Thus, a core of methyl methacrylate polymer or polystyrene may be coated with (a) methyl methacrylate monomer, (b) allyl methacrylate monomer or (c) abrasion-resistant material in the form of cross-linked polymers such as polymers of esters of allyl alcohol or its derivatives, e.g. polymers of allyl methacrylate, chloracrylate or crotonate, diallyl oxalate or phthalate, or glycol dimethacrylate. The film may be applied by dipping or spraying, and as a monomer or a solution of polymer in monomer or in a volatile solvent. The monomers are polymerized during the moulding. The film may, or may not, have the same refractive index as that of the core. According to the first Provisional Specification, the core may be of thermosetting material.ALSO:A solid transparent core of thermoplastic material, and of form and dimensions closely approaching those of the desired finished lens, is coated with a liquid or semi-liquid film of transparent thermoplastic material or of transparent thermosetting abrasion-resisting material, and the coated core is moulded in dies having optically-accurate surfaces. Thus, a core of methyl methacrylate polymer or polystyrene may be coated with (a) methyl methacrylate monomer, (b) allyl methacrylate monomer or (c) abrasion-resistant material in the form of cross-linked polymers such as polymers of esters of allyl alcohol or its derivatives, e.g., polymers of allyl methacrylate, chloracrylate or crotonate, diallyl oxalate or phthalate or glycol dimethacrylate. The film may be applied by dipping or spraying, and as a monomer or a solution of polymer in monomer or in a volatile solvent. The monomers are polymerized during the moulding. The film may or may not have the same refractive index as that of the core. The core may be formed by machining, grinding and polishing, or by moulding. Specifications 482,836, 556,743, 572,748, 583,091 and 585,576, are referred to. According to the first Provisional Specification, the core may be of thermosetting material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1956443A GB585580A (en) | 1943-11-23 | 1943-11-23 | Improvements in the manufacture of lenses from plastic materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1956443A GB585580A (en) | 1943-11-23 | 1943-11-23 | Improvements in the manufacture of lenses from plastic materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB585580A true GB585580A (en) | 1947-02-12 |
Family
ID=10131483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1956443A Expired GB585580A (en) | 1943-11-23 | 1943-11-23 | Improvements in the manufacture of lenses from plastic materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB585580A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113549174A (en) * | 2021-04-06 | 2021-10-26 | 富螺(上海)医疗器械有限公司 | Polymer, method for producing polymer, and intraocular lens |
-
1943
- 1943-11-23 GB GB1956443A patent/GB585580A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113549174A (en) * | 2021-04-06 | 2021-10-26 | 富螺(上海)医疗器械有限公司 | Polymer, method for producing polymer, and intraocular lens |
| CN113549174B (en) * | 2021-04-06 | 2023-06-23 | 上海富吉医疗科技有限公司 | Polymer, method for producing polymer, and intraocular lens |
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