Canon Kabushiki Kaisha

Disco Corporation

Keisuke Nakano

Naoki Nishimura

Kazushi Ino

Takuya Mukaibara

Takashi Fukuhara

Ryo Shimazu

Satoshi Yamanaka

Minoru Hayasaki

Satoru Koyama

Hiroki Miyamoto

Junya Kobayashi

Yasuhiko Okuma

Mitsuhide Murofushi

Multiple holding surfaces of a chuck table are disposed in such a manner that the heights thereof from a reference surface are in increasing order along a first direction parallel to each of them. Thus, in a case of using this chuck table, creep-feed grinding for workpieces each held by a respective one of the multiple holding surfaces can be executed in states in which a grinding unit is positioned at different heights. In this case, the workpiece for which the creep-feed grinding has been executed is located on the lower side as viewed from the grinding unit when another workpiece is ground. Due to this, in this creep-feed grinding, a specific workpiece can be prevented from being ground twice.

Chuck table and grinding method of workpieces

One array of grindstones is used for in-feed grinding and creep-feed grinding. Therefore, it is not necessary to position a chuck table that is holding a plate-shaped workpiece with respect to two different arrays of grindstones. As a result, a period of time required to grind the plate-shaped workpiece can be shortened. Furthermore, lower surfaces of the grindstones are used for the in-feed grinding, whereas side surfaces of the grindstones are used for the creep-feed grinding. Consequently, the amount by which the grindstones are worn can be smaller than that in a case where the plate-shaped workpiece is ground to a predetermined thickness in only the in-feed grinding or the creep-feed grinding.

Method of grinding plate-shaped workpiece

An emitter emits light such that the light crosses a conveyance path. A reflector reflects the light. A receiver receives reflected light. A determiner determines that a sheet is present on the basis of an amount of reflected light. A controller may increase a light amount of the light-emitting unit from a first light amount to a second light amount on the basis of a temperature of the light-emitting unit and a reflectance of the reflecting member. The controller may increase a receiving gain of the receiver from a first gain to a second gain on the basis of a reflectance of the reflecting member.

Image forming apparatus capable of detecting sheet

The present disclosure is a printed circuit board on which a connector to connect with a flexible flat cable or a flexible printed circuit board is mounted. The printed circuit board including a receiving port at which the connector receives the flexible flat cable or the flexible printed circuit board; and an opening that is disposed between an end of the printed circuit board facing the receiving port of the connector and a position corresponding to at least one of end portions of the receiving port.

Printed circuit board and image forming apparatus having printed circuit board

The power supply apparatus includes a detecting unit that has a first detecting device, a second detecting device and a third detecting device, detects a current flowing into the primary winding, and outputs a voltage corresponding to the current, and a control unit that controls a switching operation of the switching element, an output voltage which the detecting unit outputs to the control unit includes a first output voltage at which the control unit stops an operation of the switching element at a time of the second state, a second output voltage at which the control unit stops the operation of the switching element at a time of the first state, a third output voltage at which the second detecting device is brought into a conducting state, and a fourth output voltage at which the third detecting device is brought into a conducting state.

Power supply apparatus and image forming apparatus

An image forming apparatus includes a light-receiving unit that includes light-receiving elements arranged along a movement direction of a target formed on an image carrier, and is arranged so as to receive light emitted from a light-emitting unit and specularly reflected off the image carrier; a member configured to limit a size, in the movement direction, of diffused reflection light that is incident on the light-receiving unit; a selection unit configured to select whether or not each of the light-receiving elements in the light-receiving unit is an effective light-receiving element; a generation unit configured to generate a detection signal from an output of the effective light-receiving element; and a detection unit configured to detect a target formed on the image carrier based on the detection signal.

Image forming apparatus and optical sensor detecting target formed on image carrier or recording medium using effective light-receiving elements

Image forming apparatus and optical sensor detecting target formed on image carrier or recording medium

The power supply apparatus includes a control unit configured to determine a stand-by time period from making a connection of a switch unit to subjecting a second voltage conversion unit to activation according to an input voltage of the alternating current power supply detected by a voltage detection unit.

The present invention provides an apparatus having a part of a current detecting circuit configured to detect current to a heater in a fixing unit so that a main body of the image forming apparatus may have one configuration for 100 V and 200 V and provides an equal resolution of current detection for an apparatus for 100 V and an apparatus for 200 V.

Growing community of inventors

Suntou-gun, Japan

Keisuke Nakano