Glass manufacturing – Processes – With measuring – sensing – inspecting – indicating – or testing
Patent
1991-09-11
1993-11-23
Woodard, Joye L.
Glass manufacturing
Processes
With measuring, sensing, inspecting, indicating, or testing
65102, 65162, C03B 2300
Patent
active
052640167
ABSTRACT:
A glass blank is molded into a lens while being clamped between a pair of molds and heated by a heater. A mold clamping force is applied, substantially concurrently with the heating, to the molds to deform the lens blank. The mold clamping force is unable to deform the lens blank when the temperature of the lens blank is below a transition point of the lens blank and the mold clamping force is able to deform the lens blank when the temperature of the lens blank is above the transition point. The deformation starting point of the lens blank is detected based on a movement of the molds. A temperature of the molds at the deformation starting point is also detected. The temperature of the molds at the starting point is stored in a control device. The heating of the molds and the lens blank is controlled based on the difference between the temperature stored in the storing step and the transition point of the lens blank so as to prevent the temperature of the lens blank from exceeding the transition point by a predetermined degree. Press molding, with intensification of the mold clamping force, occurs with a progression of the deformation of the lens blank.
REFERENCES:
patent: 4591373 (1986-05-01), Sato
patent: 4738703 (1988-04-01), Izumitani
patent: 4915720 (1990-04-01), Hirota
patent: 5015280 (1991-05-01), Kimoto
Winter, Transformation Region of Glass, Journal American Ceramic Society, vol. 26, No. 6, 1943 pp. 189-200.
Toshiba Kikai Kabushiki Kaisha
Woodard Joye L.
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