Glass manufacturing – Processes – Sequentially forming – reheating – and working
Patent
1988-10-27
1990-01-02
Lindsay, Robert L.
Glass manufacturing
Processes
Sequentially forming, reheating, and working
65 39, 264 12, 264 22, 350409, 350417, 425808, C03B 2300
Patent
active
048910538
ABSTRACT:
A method of manufacturing biconvex lens elements (21) comprising a biconvex glass lens (23) and a holder (1) consisting of two cylindrical rings (5,7), which are telescopically slidable with respect to each other and have different diameters so that an annular gap (9) is formed. A lens blank is heated together with the holder (1) in the telescopically extended position of the rings (5,7) to the processing temperature of the glass and is arranged between the heated dies (17, 19) of a mould, whereupon the dies (17, 19) are moved towards each other in a pressing stroke, the two rings (5,7) being telescoped into each other, the lens blank in the holder being moulded into a biconvex glass lens (23) and the excess quantity of glass being pressed from the hotter central part of the lens blank into the annular gap (9). The lens element (21) obtained after cooling is characterized by a biconvex glass lens (23), which is FIG. 7.
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Bartman Gerrit E.
Hattu Nicodemus
Lindhout Willem J.
Trommelen Sebastiaan F. M.
Botjer William L.
Lindsay Robert L.
U.S. Philips Corp.
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