Asahi Kogaku Kogyo Kabushiki Kaisha

Asahi Kogaku Kogyo K.k.

Manabu Imoto

Kiyoshi Negishi

Yoshihiro Yamazaki

Hideo Aida

Shinyu Ikeda

An image reader is disclosed in which, upon application of an illuminating light beam to an original by an illuminating optical system, a light beam reflected from the original is applied through a contracting optical system to a line sensor for converting an optical image of the original into an image signal. The image reader has a first mirror provided for said original to reflect said light beam reflected from the original; a repetitive reflection optical system including a pair of parallel mirrors for causing said light beam reflected by the first mirror to go and return at least once in a reflection mode; and a second mirror provided for a contracting optical system to reflect the light beam thus caused to go and return towards the contracting optical system.

Image reader

The present invention provides an intensity control device for a laser in a laser beam printer that produces a hard copy of image information by copy-processing a photosensitive surface scanned by the laser while it is in a scanning mode during which the laser is modulated by the image information. The intensity control device according to the present invention stores a first representation of a present light intensity of the laser during its non-scanning mode. It further stores a second representations of a user selected image density for a hard copy produced by the printer. The first and second representations are combined for forming a control voltage during a non-scanning mode of the laser. Finally, a current is produced that is supplied to the laser in response to the control voltage such that the intensity of light produced by the laser is dependent on both the first and second representations.

Intensity control for a semiconductor laser of a laser beam printer

An original's size reading device for use in a continuously variable magnification type copying machine which automatically reads the size of an original placed on an original platen so that it is unnecessary to perform manual operations or calculations to adjust the magnification setting or copy size. A first mirror receiving a light beam from the original is provided below the stationary original platen with the first mirror being movable parallel to the platen. A light beam reflected from the first mirror is applied through a second mirror and a magnification varying optical system to the photosensitive element of the copying machine. The original's size reading device employed in this copying machine includes an original's edge detector for detecting the size of the original in association with the movement of a moving unit on which the first mirror is fixedly installed.

Growing community of inventors

Tokyo, Japan

Manabu Imoto