Kabushiki Kaisha Toshiba

Toshiba Tec Kabushiki Kaisha

Hiroyuki Kunugi

Koji Tanimoto

Kenichi Komiya

Daisuke Ishikawa

Yuji Inagawa

Hidehito Sasaki

Shungo Miyata

In the light amount correction in the main scanning direction, sets of correction values of black and cyan for which the reflection frequency of optical elements are equal to an even number of times are made common to each other (a correction value set&#x2014;KC), and sets of correction values of magenta and yellow for which the reflection frequency of optical elements are equal to an odd number of times are made common to each other (a correction value set&#x2014;MY), whereby sets of correction values stored in a correction value storage portion in a correction value setting portion are reduced to two sets. Furthermore, in connection with this, the number of DA converters is reduced to two DA converters of a DA converter&#x2014;K, C and a DA converter&#x2014;M, Y.

Image forming apparatus

An image forming apparatus include an ejection space defined between the bottom of an image reading section and image forming section and having an opening at the front of the main unit, an ejection tray cover defining the bottom of the ejection space and configured to receive a paper sheet ejected from the image forming section, the ejection tray cover covering the image forming section, an attachment section provided at the front of the image reading section, and a control panel unit attached to the attachment section by a hinge having a predetermined rotational resistance, the control panel unit being rotatable through a predetermined angle with respect to an imaginary horizontal plane, and being able to be held in a direction of rotation.

Image forming apparatus with rotatable control panel unit

The multi-beam optical unit of the invention limits the number of reflection times by half mirrors to one time or below when a plurality of beams are combined into one and guided to a polygon mirror, so that an influence upon an image due to a positioning error of the half mirrors can be minimized. Besides, power of emitted beams can be made uniform by using the half mirrors having transmissivity and reflectance satisfying predetermined conditions regardless of the number of times that the beams penetrate the half mirrors. Thus, the service lives of a plurality of beam emitting sources can be made uniform, and maintainability can be improved.

Optical scanner using multiple half mirrors to combine multiple optical

Growing community of inventors

Numazu, Japan

Hiroyuki Kunugi