| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens substrate cleaning method by which a lens substrate can be cleaned until the surface of the cleaned lens substrate has almost ideal cleanliness. SOLUTION: The surface of the lens substrate consisting of CaF2 single crystal is ground to a prescribed surface shape. After that, the lens substrate is subjected to acid treatment as the pretreatment of a cleaning step to clean the ground surface of the lens substrate.
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