Canon Kabushiki Kaisha

Michiharu Masuda

Takayuki Kawakami

Hisatsugu Tahara

Hajime Kaji

Yoshiyuki Suzuki

Akio Ito

Yoshihito Osari

Michio Kawase

Kazuhiko Hirooka

Kazuyuki Iwamoto

Yoshihiro Funamizu

Masayuki Honma

Masashi Oyumi

Tomobumi Nakayama

Tsunao Hombo

Yasuki Nakajima

Shunichi Komatsu

Tomobumi Nakayama, Deceased

An information processing apparatus determines whether an authentication portion on an image forming apparatus side can authenticate user authentication information input on the information processing apparatus side. If it is determined that the authentication portion on the image forming apparatus side can authenticate the user authentication information input on the information processing apparatus side, transmission of image data from the information processing apparatus to the image forming apparatus is controlled.

Information processing apparatus, image forming apparatus, image forming system, information processing method, and image forming method

There is provided a sheet detecting apparatus which detects the position of a sheet as it is conveyed through a conveying path and has reached a predetermined position. The surface condition and thickness of the sheet are also detected and a correction system is provided for correcting the position detecting result in accordance with the detected thickness and surface condition. Also provided is a conveying apparatus in which the conveyance of the sheet is controlled on the basis of the corrected sheet position detection.

Sheet detecting apparatus with correction means for sheet surface condition and sheet thickness

An image forming apparatus is arranged to form an image with laser light emitted from a semiconductor laser source, and is constructed so as to protect the laser source from a breakdown, by regulating electric current flowing to the laser source no matter when an adjusting circuit for adjusting the light amount of the semiconductor laser source is apt to supply the electric current that could break the laser source, to the laser source. The apparatus is constructed in such structure that during an automatic light amount control period the laser light amount emitted from the semiconductor laser source is detected and a current source circuit is made inactive when the light amount detected is over a set light amount and that during periods other than the control period the electric current flowing to the semiconductor laser is detected and the current source circuit is made inactive when the light amount detected becomes over a fixed ratio times the current detected during the automatic light amount control period. In this way, the protection circuit can operate effectively anytime of emission of the laser source, so as to protect the laser source from the breakdown.

Laser control apparatus with a current detecting and interrupting system

A laser driving apparatus for driving a plurality of laser beam sources includes a plurality of laser beam sources, a photodetector for detecting amounts of laser beams emitted from the plurality of laser beam sources, a plurality of current sources for driving the plurality of laser beam sources, a plurality of switches respectively interposed between the plurality of laser beam sources and the plurality of current sources, a plurality of controllers for controlling light amounts of the plurality of laser beam sources by comparing the light amounts detected by the photodetector with a reference value and controlling current amounts of the plurality of current sources in accordance with the comparison values, a plurality of sample/hold circuits respectively interposed between the photodetector and the plurality of controllers, and timing adjustment device for outputting a plurality of timing signals of a first type for controlling the plurality of switches and a plurality of timing signals of a second type for controlling the plurality of sample/hold circuits. The timing adjustment device outputs the plurality of timing signals of the first type for time-divisionally turning on the plurality of switches and sequentially making the plurality of laser beam sources to emit laser beams one by one. The plurality of timing signals of the second type making each of the plurality of sample/hold circuits corresponding to the plurality of switches sample while each of the plurality of switches is on. The plurality of timing signals of the second type making each of the plurality of sample/hold circuits sample while any one of the switches which are turned on before a corresponding switch is on.

Laser driving apparatus and image forming apparatus using the same

An image forming apparatus has a reversing unit for reversing a sheet with an image formed and discharging the reversed sheet, a determining unit for determining whether the sheet with an image formed is reversed or not reversed with the reversing unit before the sheet is discharged and a page order control unit including a first mode of forming images of a plurality of pages in a first page mode and a second page mode of forming images of a plurality of pages in a second page mode different from the first page mode, wherein in accordance with whether the apparatus operates in the first mode or in the second mode, the determining unit determines whether the sheet with an image formed is reversed or not reversed with the reversing unit before the sheet is discharged.

Image forming apparatus and method and information processing system and

In an APC control lead-in method in an image forming apparatus having a plurality of laser light sources, a laser beam emitted by at least one of the plurality of laser light sources is scanned by a deflector to detect a synchronization signal from the scanned laser beam. A first laser light source as one of the plurality of laser light sources is turned on to be led in APC control of the first laser light source. A second laser light source as the remaining one of the plurality of laser light sources is turned on in synchronism with the synchronization signal after lead-in of the APC control of the first laser light source is complete so as to be led in APC control of the second laser light source.

Method of leading in APC control and image forming apparatus using the

An information signal recording and/or reproducing apparatus is arranged to selectively input any one kind of information signal from among a plurality of kinds of information signals which are externally supplied and an information signal reproduced from a recording medium, and control the operation of recording the information signal, in accordance with the state of the input information signal. Accordingly, the apparatus is capable of accurately and stably recording and/or reproducing the information signal on the recording medium.

Growing community of inventors

Numazu, Japan

Michiharu Masuda