Canon Kabushiki Kaisha

Hideyuki Miyamoto

Taku Fukita

Yasuo Suzuki

Mikio Nakasugi

Akihiro Fukutomi

Isshin Sato

Atsushi Sano

Tomoyuki Araki

Jun Azuma

Tamotsu Kaneko

Yasutaka Naruge

Kenichi Tomita

Michiyo Fukutomi

A light irradiation unit forms an electrostatic latent image pattern on a photosensitive member by irradiating the photosensitive member and a shielding unit with light. A detection unit detects, in a rotation direction of the photosensitive member, timing at which a surface potential of the photosensitive member changes depending on displacement of the electrostatic latent image pattern in an axial direction of the photosensitive member.

Image forming apparatus

An optical scanning apparatus includes a light source; a deflection scanner for scanningly deflecting a laser beam emitted by the light source; a deflection member for deflecting a part of the laser beam emitted by the light source, the deflection member being disposed between the light source and the deflection scanner; a common sensor for receiving the laser beam emitted by the light source; wherein the common sensor receives both of the laser beam deflected by the deflection member before it is incident on the deflection scanner and the laser beam scanningly deflected by the deflection scanner.

Optical scanning apparatus with composite collimator-deflector between laser source and deflection scanner

An image forming apparatus is provided with a scanning unit emitting a laser beam, and an openable and closable member openable and closable relative to an image forming apparatus main body, and the openable and closable member has a positioning portion for positioning the scanning unit. Thereby, the scanning unit can be accurately positioned in the image forming apparatus main body.

Image forming apparatus including holding member

The present invention provides an image scanning apparatus that has deflection device for deflecting a light flux emitted from a light emitting source a lens for guiding the light flux deflected by the deflection device to a surface to be scanned, and a holding base for holding the lens, the holding base being provided with a recess portion wherein the lens has a curved surface portion on a lower face thereof, and the holding base holds the curved surface portion of the lens by the recess portion.

Image scanning apparatus

An optical deflection/scanning apparatus includes a rotary polygon mirror for reflectively scanning a light beam and a motor for rotating the rotary polygon mirror. The motor has a rotor yoke and a rotor magnet. The rotor magnet is attached inside of the rotor yoke such that a curved portion of the rotor yoke projects vertically from one end of the rotor magnet so as to prevent any trouble caused on the lower end of the rotor due to a centrifugal force during rotation of the rotary polygon mirror.

Optical deflection/scanning apparatus

A bearing device is structured to include a stator portion which includes one of a shaft and a sleeve, a rotor portion which includes the other of the shaft and the sleeve which are structured to be capable of relative rotation therebetween, a first permanent magnet mounted on the rotor portion, and a second permanent magnet mounted at a position opposed to the first permanent magnet. The rotor portion is floated up relative to the stator portion by a magnetic force working between the first permanent magnet and the second permanent magnet. The first permanent magnet is mounted on the upper end portion of the rotor portion, the second permanent magnet is mounted on the upper end portion of the stator portion, and the first permanent magnet and the second permanent magnet are provided in opposed relationship with each other in a circumferential direction perpendicular to an axial direction of the bearing device.

Bearing device and deflecting-scanning apparatus using the same

In a light deflecting apparatus, a sleeve formed of ceramic material is relatively rotatably fitted onto the periphery of an axis of ceramic material, a rotary polygonal mirror is mounted to a rotor portion including the axis or the sleeve, and the rotor portion is rotated by a driving motor. The axis is a rotary axis, a metal member formed of metal is mounted to the periphery of the rotary axis, and the rotary polygonal mirror is mounted to the metal member.

Light deflecting apparatus and deflection scanning apparatus using the

Scanning optical device is provided with a light source unit, a deflector for deflecting light beam from the light source, a deflector driving circuit for driving the deflector and an optical housing for accommodating the deflector and the deflector driving circuit. The device is further provided with a cover for closing the optical housing. The cover is provided with an opening through which the deflector driving circuit is exposed to the external air. The hole in the cover is constituted by a tubular partition wall integrally formed with the cover.

Growing community of inventors

Numazu, Japan

Hideyuki Miyamoto