Asahi Kogaku Kogyo Kabushiki Kaisha

Hideaki Ohno

Takashi Okuyama

Tokuhisa Ito

Izumi Kurata

Automatic focusing apparatus in an optical drawing machine, comprising a drawing optical means having a dichroic mirror which transmits light for drawing and reflects light for detecting the focus to apply the focus detecting light to which a photosensitive material is insensitive onto the latter, an imaging lens means, and a focus detecting device for detecting whether the surfaces of the photosensitive material are located in the depth of focus of the drawing optical means.

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Sakadoshi, Japan

Hideaki Ohno