Die and glass material for forming glass substrate, method for manufacturing glass substrate, and magnetic disk glass substrate
The present invention relates to a method for producing magnetic disk glass substrates suitable for recording media such as magnetic disks in large quantities and at a low price. A glass material () is placed in a forming die including a pair of upper and lower dies () and a control member () for co...
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Main Authors | , , , , |
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Format | Patent |
Language | English |
Published |
13.04.2004
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Online Access | Get full text |
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Abstract | The present invention relates to a method for producing magnetic disk glass substrates suitable for recording media such as magnetic disks in large quantities and at a low price.
A glass material () is placed in a forming die including a pair of upper and lower dies () and a control member () 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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AbstractList | The present invention relates to a method for producing magnetic disk glass substrates suitable for recording media such as magnetic disks in large quantities and at a low price.
A glass material () is placed in a forming die including a pair of upper and lower dies () and a control member () 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. |
Author | Onoda, Minoru Takagi, Kazuaki Hibino, Kunio Okuyama, Fujio Tokunaga, Tomokazu |
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References | Komiyama et al. (5938807) 19990800 Menihan et al. (5125945) 19920600 (1-176237) 19890700 (62-252331) 19871100 Hirota et al. (4836840) 19890600 Richards et al. (5762676) 19980600 Koyama et al. (6306786) 20011000 Hirota (5013348) 19910500 Sakamoto (5770294) 19980600 (7-215721) 19950800 (00/66504) 20001100 (64-79023) 19890300 Takagi et al. (5817161) 19981000 Shigyo et al. (5173100) 19921200 (63-79727) 19880400 (2-26843) 19900100 (6-271323) 19940900 |
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Snippet | The present invention relates to a method for producing magnetic disk glass substrates suitable for recording media such as magnetic disks in large quantities... |
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Title | Die and glass material for forming glass substrate, method for manufacturing glass substrate, and magnetic disk glass substrate |
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