Mitsubishi Denki Kabushiki Kaisha

Hidetada Nagaoka

Keiichi Nishikawa

Yukio Izumi

Atsuo Onoda

Yuuji Oomura

Masao Sato

Akira Hashimoto

Yasutaka Mizutani

Kazuo Hasegawa

Yoichi Muratomi

Masayoshi Kamo

Hiroshi Ito

Hiroaki Sugiura

Satoru Akutsu

Kazuya Oda

Narihiro Matoba

Tetsuya Kuno

Takeo Fujita

Yuji Ohmura

Katsumi Kurita

Mitinaga Suzuki

Kiyotaka Hoshi

Hideto Nishimura

Koichi Okubo

An image pickup apparatus includes a solid-state imaging device, an accumulating section, first and second imaging parameter setting sections, a calculating section, a flicker detecting section, and a switching section. The accumulating section calculates a projection output value of a predetermined line in a frame. The calculating section calculates inter-frame variations of the projection output values, and calculates a flicker index from the variations of a predetermined number of frames. The flicker detecting section detects the flicker from the index, and controls the switching section in response to the detection result of the flicker, so that the switching section selects either the setting signals from the first imaging parameter setting section or the setting signals from the second imaging parameter setting section. Thus, the charge storage time of the solid-state imaging device is set at either an integer multiple of 1/100 second or an integer multiple of 1/120 second in response to the frequency (50 Hz or 60 Hz) of a power supply of the fluorescent lighting. The image pickup apparatus can solve a problem of a conventional apparatus in that it is difficult for the conventional apparatus to suppress the flicker in regions where the frequency of the power supply differ from each other.

Image pickup apparatus with reduced flicker and automatic level adjusting method of the same

A head assembly moving along a long side of a magnetic card, more than one magnetic head rotating in the head assembly for reading/writing data, a rotary transformer and a carriage with a card holding mechanism for keeping a card at a predefined position are provided in a card reader of the present invention. A rotating part of the rotary transformer in the head assembly receives and sends a signal to the magnetic head and a fixing part of the rotary transformer is connected to a reading/writing circuit. On the card of the present invention, which is usually rectangular, there are tracks defined by plural arcs. The arcs are on plural same-size circles whose centers are aligned on one line along the long side of the card. A magnetic card or an optical card can be used for the present invention.

Card drive apparatus and card

A flexible disk drive unit including a spindle motor for driving to rotate a magnetic disk; magnetic heads opposing the magnetic disk; a carriage attached to a frame and movable in a radius direction of the magnetic disk; wherein the frame and a motor base constitute a common member and the spindle motor is of a sensorless drive system and is directly attached to the frame; and wherein the frame is provided with an attaching hole for erecting a bearing of the spindle motor of the sensorless drive system on the frame.

Frame for flexible disk drive unit having distortion prevention hole and

A brushless motor driving circuit is provided for obtaining a reliable starting and stable rotation driving irrespective of the load condition of the motor. The brushless motor driving circuit has a terminal voltage detector located at each phase of the armature windings of the motor, a terminal voltage compensator for adding or subtracting a compensation value to/from the terminal voltage of the armature windings detected at respective phases during actual driving periods, and a comparator for comparing respective terminal voltages to obtain a rotor location signal after compensation has been performed. The compensation value is determined by a resistor of the armature winding and a winding current. The armature windings are driven by the rotor location signal detected at the comparator.

Drive circuit for brushless motor

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Kanagawa, Japan

Hidetada Nagaoka