Citizen Watch Company, Ltd.

Kunio Suganuma

Kazunari Kume

Takayasu Machida

Hisao Wakabayashi

Yoshiyuki Ohishi

Hiroshi Mabuchi

Hiroshi Kurafuji

Churyo Seki

The present invention provides a floppy disk drive which can removably receive a cartridge containing a floppy disk and which can travel a READ/WRITE head to the desired track on the floppy disk while rotating the floppy disk at a constant speed for effecting the desired read/write action under an electric-magnetic conversion. The drive is of a top-up type which includes a frame portion and a carrier which can be popped up from the frame portion. The frame portion includes a spindle motor for directly driving the floppy disk, a plurality of positioning pins for positioning the disk cartridge relative to the spindle motor, and a carriage carrying the READ/WRITE head for travelling the head to the desired track on the disk. The carrier is pivotably supported by the frame portion and adapted to receive the disk cartridge. The cartridge can be loaded into the lower portion of the carrier upon popping-up of the carrier. When the carrier is engaged by the frame, the cartridge is upwardly moved to a predetermined position within the carrier.

Floppy disk drive having a pivotally supporting cartridge carrier

A head travelling mechanism for a floppy disk drive including a stepping motor which is provided with a pair of stator coils arranged in both end sides of its casing. These two stator coils are not only supplied exciting electric current with predetermined combined phases to drive the feeding belt but also the direction of these two stator coils is in parallel with the travelling direction of the magnetic heads, and combination of exciting phases in the stator coils enables the inclination of the motor shaft of the stepping motor to be absorbed as a sideways motion of the feeding belt so that the travelling error of the magnetic heads can be reduced to the minimum.

Stepping motor for a belt drive head travelling mechanism for a floppy

An electrochromic display cell comprising a plurality of display electrodes consisting of electrochromic substance, a reflection member, and an electrolyte, an opposing electrode which are arranged between transparent upper and lower substrates, characterized in that said display electrodes are arrangd in overlapping when viewed in plan, and said opposing electrode is arranged to operate with said respective display electrodes.

Electrochromic display cell

An electronic watch adapting a matrix drive display system. An electronic watch comprises a single voltage level power source serving as the energy source for a circuit of the watch, a matrix drive type liquid crystal display device providing digital indications of times by means of line and column electrodes, a crystal oscillator producing a time reference signal, a frequency divider circuit dividing said time reference signal into time unit signals, a time keeping counter counting the time unit signals to provide a time keeping signal, matrix drive circuit means converting said time keeping signal into drive signals for said line and column electrodes and pitch measurement signal transmission means act on the matrix drive circuit means to momentarily supply at least some of the wave forms of outputs of the time line and column electrode drive signals.

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Tokyo, Japan

Kunio Suganuma