Canon Kabushiki Kaisha

Stanley Electric Co., Ltd

Hidenobu Suzuki

Takashi Nakahara

Tomoko Nanbu

Takashi Soya

Shunji Nakamura

Yasumasa Ohtsuka

Daizo Fukuzawa

Yohji Tomoyuki

Kouichi Okuda

Yasumasa Nashida

Akihiro Shibata

Yoji Serizawa

Atsuyoshi Abe

Toru Tanabe

Akira Hayakawa

Manabu Takano

Takeshi Setoriyama

Toshio Yoshimoto

Yoji Tomoyuki

Yukio Ohmamyuda

Susumu Ikuma

Hiroshi Takazawa

Masashi Jyouzuka

Soya Takashi

Osamu Matsumoto

The invention provides an image forming apparatus having sheet supply device, image forming device for forming an image on a sheet supplied by the sheet supply device, fixing device for fixing the image formed on the sheet, a sheet guide for guiding the movement of the sheet, and a control board bearing an element for controlling the image forming device, wherein the sheet guide positioned between the sheet supply device and the fixing device is provided substantially linearly in such a manner that the sheet moves in an inclined upward direction, and the control board is provided in a space under the sheet guide and at the bottom face of the apparatus.

Image forming apparatus with inclined guide for sheet material

In an apparatus which cannot detect a size of recording sheet before the recording sheet is fed, the first recording sheet is regarded as having the maximum size and paper feeding is controlled on this basis and the size of the sheet is measured during the conveyance of the recording sheet. For the second or third and subsequent recording sheets, paper feeding control is executed at a paper feeding interval at which a maximum throughput is obtained in accordance with the measured size.

Image forming apparatus and method for measuring the length of a sheet

A heat fixing apparatus includes a heater; a temperature sensor for sensing a temperature of the heater; a bias wave number determining limit for determining the number of bias waves corresponding to a predetermined image fixing temperature in accordance with utility voltage source voltage; a bias wave number changing unit for changing a bias wave number in accordance with temperature changing rate of the heater; and a supply wave number control unit for controlling the number of waves supplied to the heater in accordance with an output of the temperature sensor and bias wave number. The unit includes a PID controller.

Heat fixing apparatus with temperature control based on AC power waves

A laser scanner control circuit which is used for an apparatus for scanning onto a photo sensitive material by a laser beam and forming and image thereon is constructed as a monolithic driver IC onto a single chip. A reset circuit is provided for a sample-hold circuit so as to minimize the laser power when the image forming apparatus is in a standby mode. A circuit to detect an abnormality of the laser power is further provided. Due to this, the safety of the laser power control of the sample-hold circuit is improved. The operation of the sample-hold circuit can be started at a time point when the laser emitting operation is stable.

Laser scanner control circuit which is used in image forming apparatus

A fixing apparatus includes a heating member; a temperature detecting member for detecting the temperature of the heating member; a power supply controller for controlling the power supply to the heating member so that the temperature detected by the temperature detecting element during a fixing operation is maintained substantially constant at a predetermined fixing temperature; and a temperature selecting device for selecting a fixing temperature in response to both the temperature of the heating member before beginning of the fixing temperature control and a rate of the temperature change of the heating member upon supplying a predetermined amount of power to the heating member or upon turning it off.

Fixing apparatus with variable fixing temperature

A laser scanner control circuit which is used for an apparatus for scanning onto a photo sensitive material by a laser beam and forming an image thereon is constructed as a monolithic driver IC onto a single chip. A reset circuit is provided for a sample-hold circuit so as to minimize the laser power when the image forming apparatus is in a standby mode. A circuit to detect an abnormality of the laser power is further provided. Due to this, the safety of the laser power control of the sample-hold circuit is improved. The operation of the sample-hold circuit can be started at a time point when the laser emitting operation is stable.

An image heating apparatus includes a heater; temperature detector for detecting a temperature of the heater; electric power supply controller for controlling electric power supply to the heater during image heating, so that the temperature detector detects a predetermined set temperature; and a temperature determining device for determining the set temperature on the basis of a change of the temperature detected by the temperature detector when electric power supply to the heater is stopped.

Image heating apparatus changing set temperature in accordance with

An image forming apparatus includes a detecting unit that detects the size of a recording medium and a designating unit that designates the size of a recording medium onto which an image is to be recorded. The comparing unit compares the detected size with the designated size to determine which size is larger and a control unit controls the apparatus to perform operations such that an operation when the detected size is larger than the designated size is different from that when the detected size is smaller than the designated size.

Image forming apparatus with control based on detected and designated

An apparatus for properly adjusting an attitude of optical axes of head lamps on a vehicle includes a motor driven actuator and a controlling section. The motor driven actuator additionally includes a voltage dividing circuit comprising two resistors and one of a plurality of contact positions in the controlling section is earthed directly, whereby a resistance value of the controlling section becomes zero ohm when the angle of elevation assumed by the head lamps is maximized in an upward tilted state. A motor circuit in the motor driven actuator includes in a power supply line an element for preventing an excessive intensity of electric current from being fed to a motor when motor is held in a blocked state for some reason. Preferably, the element has positive temperature characteristics which suppress generation of heat when rotation of the motor is blocked.

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Kawasaki, Japan

Hidenobu Suzuki