Nisca Corporation

Konica Corporation

Koji Ogino

Kiyoshi Hata

Tsuyoshi Mizubata

Ichitaro Kubota

Masanobu Kawano

Shinnosuke Enomoto

Junya Ozawa

Kazuhide Sano

Yuichi Kagami

Sei Takahashi

Toru Ochiai

Fumimasa Amemiya

Hiroyuki Hirokawa

Fumihide Sakamoto

To provide an illumination device in which there is no variation in light intensity distribution of the illumination device, and in which illumination spots, particularly light intensity spots, are not prone to occur in a read image in an image reading device, by maintaining a constant gap between a light source and an end face of a light guide. The illumination device includes: a light guide having an end face for taking in light, a diffuse reflecting surface for diffusely reflecting the light taken in from the end face, and a light exit surface for emitting the light that is diffusely reflected at the diffuse reflecting surface towards an irradiation surface. The illumination device further include a reflector having a diffuse reflecting surface that reflects light from the light source toward the one end face of the light guide. The light guide has, at the one end, a flange portion that abuts the reflector, the light source is mounted to a circuit board, and the reflector is held between the flange portion of the light guide and circuit board so as to maintain a predetermined gap between the light source and light guide.

Illumination device

An image reading apparatus is provided which enables image data of high S/N ratio with constant resolution to be acquired without fluctuations in resolution over the entire area of an original document, while actualizing the compact image reading apparatus by minimizing the spaces on the opposite end sides in the sub-scanning direction of the platen, has a line light source for applying light to the original document, a carriage installed with the line light source to travel in a sub-scanning direction of the document, a stepping motor for driving the carriage, a line sensor for receiving the reflected light of the document guided by the optical means to convert into image data, and control means for performing traveling control of the carriage, blinking control of the line light source, and control for capturing the image data from the line sensor, and captures the image data from the line sensor while varying a period of a motor clock signal to drive the stepping motor for a duration of acceleration control for starting traveling of the carriage to reach constant-velocity traveling after starting reading of the document.

Image reading apparatus and image reading method

A document reading apparatus and method are provided for outputting an image faithful to a document as possible even if the document is accidentally fed in an oblique fashion on the way of a sheet feeding path. For this purpose, a plurality of document end detecting sensors Sto Sare disposed on the way of the sheet feeding path, and further, a reading controllercalculates a skew quantity &#x3b8; of the document with respect to the sheet feeding pathbased on a signal output from the document end detecting sensor, thereby adjusting a document reading timing in accordance with the skew quantity.

Apparatus and method for reading document

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Yamanashi, Japan

Koji Ogino