Patent ID: 6534120
Filing Date: 2003-03-18
Classification: C03C,G11B

Abstract:
A manufacture method of a chemically reinforced glass substrate for a magnetic recording medium by placing a glass substrate in contact with a chemically reinforcing molten salt contained in a chemical reinforcement tank to perform chemical reinforcement, preventing particles which cause a recording or regenerating malfunction due to a head crash or a thermal asperity from sticking to the glass substrate, said method comprising the steps of: separating the atmosphere of the chemical reinforcement tank from the atmosphere of a dissolution tank for dissolving a raw material of the chemically reinforcing molten salt in a manner to prevent a powder raw material of the chemically reinforcing molten salt from being mixed in a glass substrate operation atmosphere for performing the chemical reinforcement; dissolving the raw material in the dissolution tank to obtain the chemically reinforcing molten salt; transferring the dissolved chemically reinforcing molten salt to the chemical reinforcement tank; and placing the glass substrate in contact with the chemically reinforcing molten salt of the chemical reinforcement tank to perform the chemical reinforcement so that impurities that may be mixed in the raw material in the initial introduction of the chemically reinforcing molten salt or generated in the raw material during replacement of the chemically reinforcing molten salt are prevented from sticking to the chemically reinforced glass substrate.