C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 101/00 (2006.01) B24B 13/005 (2006.01) G02C 7/02 (2006.01)
Patent
CA 2053999
ABSTRACT OF THE DISCLOSURE Components for use in the formation of a finished or partially finished ophthalmic lens, such as lens blocks 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 104 psi, a minimum flexural modulus of 2 x 106 psi, and a specific gravity of less than 1.60. The lens block includes a unique arrangement of ribs to strengthen the block and increase its heat transfer properties. Metal finishing centers 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.
Coleman Milton
Hyslop Ronald T.
Rotenberg Don H.
Coburn Optical Industries Inc.
Coleman Milton
Hyslop Ronald T.
Pilkington Visioncare Inc.
Rotenberg Don H.
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