| 摘要 |
Two metallic half-moulds are produced from a prototype. The half-moulds have complementary mould faces which abut when the mould is closed, and moulding surfaces formed with annular rim depressions joined by a bridge cavity, each rim depression bordering a support surface for a false lens. A webbed frame front is moulded, false lenses are cut from that moulded front, and the mould faces which abut are set-back by a total amount corresponding to the shrinkage of the false lenses, so that the false lenses are gripped between the support surfaces and shape lens bezels in the rims when a frame front is moulded. |
| 申请人 |
ESSILOR INTERNATIONAL (COMPAGNIE GENERALE D'OPTIQUE), CRETEIL, VAL-DE-MARNE, FR |
发明人 |
LENNE, WILLIAM, GAGNY, SEINE-ST.-DENIS, FR;BOURDOT, JEAN-FRANCOIS, PARIS, FR;ROLLAND, GUY, VINCENNES, VAL-DE-MARNE, FR |
