Glass substrate forming mold and production method for glass substrate
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United States of America Patent
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Apr 1, 2003
Grant Date -
N/A
app pub date -
Dec 14, 2000
filing date -
Apr 30, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A glass material (4) is placed in a forming die including a pair of upper and lower dies (1, 2) and a control member (3) for controlling the space between the upper and the lower die, and then heated, softened, and molded by pressure into a glass substrate in the shape of a parallel plate. The amount of thermal contraction of the control member is smaller than that of the glass material. Therefore, the glass substrate is released from the die when cooled after molding. The present invention can provide a glass substrate that is excellent in smoothness and form accuracy of the surface, and that is suitable for recording media such as magnetic disks that are inexpensive and suitable for mass production.
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