Canon Kabushiki Kaisha

Hiroshi Shiba

Hiroshi Mano

Kengo Umeda

Masanori Akita

Tomoyuki Okada

Atsutoshi Ando

Fumihiro Ueno

Masao Umezawa

Yoshitaka Kokubo

Tomoo Nagaoka

Yoshitaka Kukubo

The hub device includes a USB hub IC; a voltage converter that converts a source voltage supplied to the Hub device into a source voltage to be supplied to the USB device/devices connected to the plurality of downstream ports, and, in a case that the USB device/devices is/or in an abnormal condition, outputs a signal notifying the abnormal condition; and a plurality of switch units that interrupts a source voltage to the USB device/devices, and outputs an overcurrent detection signal when overcurrent flows into the USB device/devices, wherein the USB hub IC includes a plurality of overcurrent detection terminals into which the overcurrent detection signal from the plurality of switch units is input, and a signal notifying the abnormal condition causes the plurality of overcurrent detection terminals of the USB hub IC to be in an overcurrent detection condition.

Hub device and system using the same

A sensor system includes an LED configured to emit light to a recording medium and a light-receiving sensor configured to receive a transmitted light that has passed through the recording medium after having been emitted from the LED to the recording medium. An emitting optical axis of the LED is away from a perpendicular receiving optical axis of the light-receiving sensor.

Sensor system and apparatus for identifying recording medium

An image heating apparatus includes a rotation made of a metal, a heater to which a current is applied, whereby heat dissipates from the heater and the heater contacts an internal surface of the rotation member, and a pressure roller for pressurizing the rotation member together with the heater to form a nip, wherein the rotation member is electrically grounded via a fuse. By the virtue of the invention, it is rendered possible to suppress charging of the metal rotation member and to suppress a current leak to a main frame of an image forming apparatus.

Image heating apparatus with elastic conductive member contacting internal surface of rotation member

In a density control apparatus capable of coping with a change in light sensitivity, an image formation device forms a toner image on a photosensitive body on the basis of an image signal, a sensor measures density of the toner image formed on the photosensitive body, a correction device causes the sensor to measure density of a portion where the toner image is not formed on the photosensitive body and corrects sensitivity of the sensor on the basis of the measured result, a setting device sets a level shifting quantity of an output signal from the sensor after the sensitivity of the sensor is corrected by the correction device, and a determination device causes to form plural images of different densities and determines an image formation condition on the basis of the result of measuring the density of the images and the shifting quantity set by the setting device.

Density control apparatus in image formation apparatus

A photosensor includes a light emitting device, a light receiving device for receiving a side beam from said light emitting device, and a light diffusing member disposed between a side surface of said light emitting device and said light receiving device.

Photosensor using side surface light

An image forming apparatus forms a patch image on a recording medium, irradiates the patch image formed on the recording medium with light, and detects a quantity of light reflected by the patch image and outputs a first detection signal. The apparatus detects a quantity of light emitted by a light emission source and outputs a second detection signal, and amplifies the first detection signal in accordance with a first amplification gain and outputs a first amplified signal. The apparatus amplifies the second detection signal in accordance with a second amplification gain and outputs a second amplified signal, and controls image forming conditions based on the first amplified signal or the second amplified signal. An adjustment mode is executed prior to controlling the image forming conditions, and the first amplification gain is controlled when the patch image is formed with black toner, and the second amplification gain is controlled when the patch image is formed with color toner.

Image density detection adjustment device

A density control device includes an image forming unit for forming a sample image having a predetermined density onto a recording medium, a density detecting unit for detecting the density of the surface of the recording medium, and a control unit for causing the density detecting unit to detect a first density of an area where no sample image is formed on the recording medium and a second density of an area where any sample image is formed, and determining the operation conditions of the image forming unit, based on a contrast value between the first density and the second density which have been detected.

Growing community of inventors

Numazu, Japan

Hiroshi Shiba