| 摘要 |
PROBLEM TO BE SOLVED: To reduce the manufacturing costs. SOLUTION: A cover 2 having a window 2a is provided on a base 1, and the surface of the base 1 is surface-treated by corona discharge 3. The cover 2 is formed by an organic film, plastic, glass, or metal that can be easily machined, and has a shape that is not easily changed by the corona discharge 3.
|
