| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sapphire member which provides little scattering of transmission light and allows a status of an observation target arranged in an opposite side to relatively clearly be observed visibly.SOLUTION: Provided is a sapphire member which has a main component of sapphire, and a surface region which has an arithmetic average roughness Ra of 0.1μm or more, and an average length of a roughness curve element Rsm of 7μm or more, and provided is a manufacturing method of the sapphire member includes steps of: heating a basic member with a sapphire main component to 1800°C-2000°C; and decreasing a temperature to room temperature for six hours or more after the heating step.</p> |
