Ricoh Company, Ltd.

Kabushiki Kaisha Toshiba

Norihiro Yamamoto

Haruyuki Suzuki

Takashi Hashimoto

Takahisa Koike

Eiki Yoshimizu

Fumihiro Shimizu

Masayuki Muranaka

Hidetoshi Yamashita

Osamu Takase

Ryohsuke Nishi

Shigeo Kizu

Taroh Shirai

A permanent magnet motor is provided, which includes a rotor including a rotation axle and a plurality of magnetized rotor magnets on a periphery, which rotor magnets are magnetized to form alternately N-poles and S-poles; first and second ring-shaped-claw-pole units, whose inner circumferences face the rotor magnets, including a plurality of first and second claw-poles along the inner circumference, the first and the second claw-poles being closely adjacent to each other extending alternately in upward and downward axis directions of the rotation axle, bottom sides of the first and the second claw-poles forming a ring shape. A first opening portion is formed in a first joint surface of the first ring-shaped-claw-pole unit, to be joined to the second ring-shaped-claw-pole unit, and the second opening portion is formed in a second joint surface of the second ring-shaped-claw-pole unit, to be joined to the first ring-shaped-claw-pole unit.

Permanent magnet motor, position estimation apparatus and motor drive control apparatus

A motor controller that controls a motor in a first control method based on a first current command value and a second control method based on a second current command value. The motor controller includes an analog-to-digital converter to generate the second current command value based on a reference signal externally input to the motor controller and a current limit generator to generate an upper limit value of the first current command value based on the second current command value.

Motor controller, motor driving apparatus, motor driving system, image forming apparatus, and conveying device

An angle estimator includes correction means for correcting a phase of an error parameter to obtain a corrected error parameter and estimation means for calculating an estimated speed and an estimated angle of the motor based on the corrected error parameter. The error parameter is a function of an angle error representing a difference between an actual angle and an estimated angle of a motor.

Angle estimator, motor controller, motor driver, motor driving system, image forming apparatus, and conveyance device

An illumination light includes: a bridge diode that performs full-wave rectification on an alternating-current signal; a switching converter that includes a switching device and that converts the alternating-current signal on which the full-wave rectification has been performed, into a direct-current signal; a controller that controls on/off timing of the switching device; and a semiconductor light emitting element that is connected to the switching converter and the controller and to which the direct-current signal is output.

Illumination light and illumination device

A peripheral device includes an interface for connection to a wired or wireless LAN, a local interface for wireless connection, and a control unit configured to check a legitimacy of a user based on a user-specific certificate stored in a communication-function-equipped device upon being accessed through the local interface by the communication-function-equipped device using near-field wireless communication, and to allow a predetermined process to be performed upon successful authentication of the legitimacy.

Peripheral device, network system, communication processing method

An image forming apparatus includes a light source that outputs a plurality of laser beams and a control unit that adjusts the light intensity of each of the laser beams. The control unit calculates a correction value so that, when the laser beam is driven by a control value calculated by correcting a common control value using the correction value and adding a threshold to the corrected control value, the light intensity of the laser beam is equal to a target light intensity. The threshold is calculated so that, when the laser beam is driven by a control value calculated by multiplying the corrected control value by a predetermined factor, and adding the threshold to the multiplied control value, the light intensity of the laser beam is equal to the target light intensity multiplied by the predetermined factor.

Image forming apparatus and light intensity control method

A recording condition setting method includes the steps of: a) obtaining identification information from an information recording medium; b) searching through a table including history information indicative of temperature information detected in the vicinity of a light source and corresponding optimum recording power; c) extracting history information corresponding to the identification information; d) detecting temperature information detected in the vicinity of the light source; e) acquiring an optimum recording power by referring to the temperature information detected in step d) and the history information extracted in step c); and f) setting the optimum recording power acquired in step e) as a recording condition.

Recording condition setting method, program, recording medium, and information recording apparatus

An image reader includes a fight source projecting a light onto an original, and first and second photoelectric conversion elements arranged so that the first photoelectric conversion element reads first half of the original in a scanning direction and the second photoelectric conversion element reads the second half and that a first read signal of the first half of the original is transferred, starting from a center of the original, from the first photoelectric conversion element and a second read signal of the second half of the original is transferred, starting from the center, from the second photoelectric conversion element. An imaging lens projects a reflected light reflected by the original onto the two photoelectric conversion elements. A driver circuit drives the first and second photoelectric conversion elements so that the first and second read signals are output from the first and second photoelectric conversion elements, respectively. A signal processing unit processes the first and second read signals so that a finalized read signal containing information on pixels arranged in the scanning line is generated each time the original is scanned in the scanning direction.

Image reader having photoelectric conversion line sensors

A video recording/reproducing apparatus comprises a variable delay circuit for delaying an input video signal which is to be newly recorded on a recording medium and a delay controller for controlling a delay provided by this variable delay circuit. At the time of edit, the delay controller controls the delay so that the phase of a video signal reproduced from a position immediately before an edit entrance point of the recording medium coincides with the phase of an input video signal delayed by the delay circuit.

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Kanagawa, Japan

Norihiro Yamamoto