8.
    发明专利
    未知

    公开(公告)号:DE2901675A1

    公开(公告)日:1979-07-26

    申请号:DE2901675

    申请日:1979-01-17

    Applicant: CANON KK

    Abstract: An aspherical reflection preventive coating composed of a first thin film group includes one or more layers of thin film having an equal thickness, an aspherical thin film disposed on the thin film group and having an aspherical shape at the side opposite to the substrate, and a second thin film group disposed on the aspherical thin film, and comprising one or more layers of thin film, the films being arranged in the order as mentioned above from the side of the substrate.

Patent Agency Ranking