Asahi Kogaku Kogyo Kabushiki Kaisha

Katsuhiro Yoshino

Ryota Ogawa

Yoshihiro Yamazaki

Satoru Tachihara

An optical scanner including a light source which is turned ON and OFF in accordance with drawing data. A hologram deflector, made of a rotatable planar hologram disc, provided with a plurality of hologram facets through which light emitted from the light source passes, is rotated to scan an image surface with light emitted from the light source. An optical detector detects light passing in a scanning direction through at least a first reference point, for the commencement of the scanning, and a second reference point, for the completion of the scanning. A scanning time detector detects a scanning time period in which the light deflected by each hologram facet of the hologram disc, passes the first reference point and reaches the second reference point. Finally, a frequency varying device varies the frequency of the light source for each hologram facet in accordance with a unique scanning time period directed by the scanning time detector for each hologram facet.

Apparatus for correcting scanning position in optical scanner

An apparatus for installing a curved mirror used in a scanning optical system is provided. The apparatus his a curved mirror assembly that includes a wall and a reference surface which is formed on a surface of said wall. The apparatus also has a stationary member with which the scanning optical system is provided and to which the curved mirror assembly is secured. The curved mirror assembly is secured to the stationary member by using the reference surface without the reflecting surface coming in contact with the stationary member.

Growing community of inventors

Tokyo, Japan

Katsuhiro Yoshino