EP 0484036 A2 19920506 - Reinforced thermoplastic components for use in the manufacturing of ophthalmic lenses and methods of making such components.
Title (en)
Reinforced thermoplastic components for use in the manufacturing of ophthalmic lenses and methods of making such components.
Title (de)
Verstärkte Thermoplastik-Bauteile für die Herstellung von Brillengläsern und Verfahren zur Herstellung solcher Bauteile.
Title (fr)
Eléments thermoplastiques renforcés pour l'utilisation dans la manufacture de lentilles ophtalmiques et méthodes pour fabriquer les éléments.
Publication
Application
Priority
US 60409790 A 19901029
Abstract (en)
Components for use in the formation of a finished or partially finished ophthalmic lens, such as lens blocks (10) and prism rings and edging blocks and adapters for example, are formed from a carbon fiber reinforced crystalline thermoplastic containing at least 30% by weight carbon fiber based on the total weight of the component. The reinforced thermoplastic has a minimum tensile strength of at least about 20,000 psi, a minimum flexural strength of 2 x 10<4> psi, a minimum flexural modulus of 2 x 10<6> psi, and a specific gravity of less than 1.60. The lens block (10) includes a unique arrangement of ribs (18) to strengthen the block and increase its heat transfer properties. Metal finishing centers (44) are inserted into the block and are ultrasonically vibrated or heat staked in order to cause the plastic material to flow around and into serrations formed on the finishing centers. <IMAGE>
IPC 1-7
IPC 8 full level
B24B 13/005 (2006.01)
CPC (source: EP)
B24B 13/005 (2013.01)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0484036 A2 19920506; EP 0484036 A3 19920805; AU 8682591 A 19920430; BR 9104682 A 19920623; CA 2053999 A1 19920430; JP H04300154 A 19921023; MX 9101663 A 19920605; ZA 918600 B 19920826
DOCDB simple family (application)
EP 91309762 A 19911022; AU 8682591 A 19911028; BR 9104682 A 19911029; CA 2053999 A 19911022; JP 28309991 A 19911029; MX 9101663 A 19911018; ZA 918600 A 19911029