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7239108 |
Method for stepper motor position referencing
A method for referencing a polyphase stepper motor by monitoring the current step response in at least one driven phase is presented. The coil current step response is compared to past step...
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7023653 |
Floppy disk apparatus
A floppy disk apparatus improves power efficiency and quietness by commencing rotation of a stepping motor in a smooth fashion. The floppy disk apparatus includes an interface control circuit that...
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6950262 |
Flexible disk drive control method capable of preventing a seek error from occurring
In a flexible disk drive for driving a flexible disk inserted in the flexible disk drive, when a power supply is turned on and when the flexible disk is not inserted in the flexible disk drive, a...
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6870701 |
Motor driving device and disk device
A motor driving device is provided with a motor and a motor driver circuit for controlling the motor. The motor driver circuit limits the current supplied to the motor to a current below a...
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6754028 |
Control integrated circuit for floppy disk drive
A control IC is mounted on a circuit board and is used for driving both a one-inch stepper motor and a half-inch stepper motor. The control IC includes at least a number of pads required for...
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6738219 |
Seek pattern formation circuit
A seek pattern formation circuit includes a seek pattern generation circuit for generating a seek pattern formed of a predetermined pulse train every time a step pulse is applied and a seek pattern...
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6738213 |
Disk drive for controlling maximum current that flows through same
A disk drive includes a disk from and to which information can be read and written; a disk driving motor for spinning the disk; a read/write head disposed in the vicinity of the disk; a head...
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6697210 |
Disk device
In a disk device, in a state where no access to the disk is permitted, instead of permitting the head to be driven stepwise whenever step pulses are fed in, the head is inhibited from being driven...
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6555985 |
Stepping motor control device
In a stepping motor control method using an encoder, a timer means is provided, and an excessive advance of a phase during low rotation is restricted to attain a high speed without compromising...
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6515821 |
Floppy disk drive control apparatus capable of ensuring seek operation using a stepping motor having a low torque
In an FDD control apparatus for controlling a floppy disk drive for driving a floppy disk loaded in the floppy disk drive, an FDD control part including a floppy disk controller (FDC) is disposed...
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6310413 |
Steering magnets to reduce magnetic leakage flux in a disk drive
A disk drive with steering magnets that reduce the magnetic flux leakage from the actuator magnets of a linear actuator is disclosed. The steering magnets reduce flux leakage in the area of the...
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6295507 |
Calibration method for acceleration sensor in storage device and storage device
Disclosed is a calibration method for an acceleration sensor in a storage device for calibrating and a storage device, an enclosure for calibrating the acceleration sensor for compensating a...
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6271636 |
Servo control system and method for a data storage device with improved braking
A servo control system for a voice coil motor including a servo controller using position feedback to provide an acceleration current to the voice coil motor and voice coil brake providing a...
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6147832 |
Floppy disk drive with PWM control
A floppy disk drive has an exciting current supplying circuit and a control circuit for controlling the exciting current supplying circuit so that the exciting current is increased to a first...
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6072656 |
Stepping motor control method
In a stepping motor control method having an object for correctly and relatively simply determining the position of a pseudo-track center in the dead zone of a stepping motor, a forwardly and...
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6057978 |
Disk driving device selectively using delayed step pulses
A disk driving device is provided with a stepping motor arranged to move a head in units of a predetermined step with respect to a disk-shaped recording medium and a driving pulse generating...
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6023145 |
Head and disk tester with a thermal drift-compensated closed-loop positioning system
The head/disk tester of the invention has a housing 43 that houses spindle 44 that rotatingly supports a magnetic disk 31. The housing supports a moveable carriage 30 that, in turn, supports a...
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5805375 |
Wobble motor microactuator for fine positioning and disk drive incorporating the microactuator
A microfabricated wobble motor with a positioning arm attached to the wobble motor rotor acts as a fine positioner with bidirectional movement. The primary application is a rotary actuator for the...
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5783884 |
Coil components and motor using the coil components
A driving motor comprises a rotor having a rotatably supported shaft, a rotor case rotating together with the shaft, a hub seat attached to the rotor case for mounting a disk hub and a chucking...
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5687142 |
Disc apparatus having a plurality of reading/recording head driving manners for disc track seeking movement
A head reads information from and/or records information to a disc. A head driving unit drives the head on a disc in substantially radial direction thereof, the moving being executed in either a...
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5663846 |
Driving apparatus for floating-type magnetic head
A loading and unloading device for loading and unloading a head slider has an actuator driver circuit 11 for driving an actuator 3 with pulses. A counterelectromotive force generated by a voice...
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5661389 |
Compact circuit for controlling a floppy disk driver
In a floppy disk driver controlling circuit which is for use in controlling a floppy disk driver including a stepping motor (23) and which comprises a stepping motor driver (21) for producing a...
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5581421 |
Method for driving stepping motor for head seek in disk drive device
In a method for driving a head-seek stepping motor of a disk drive device of the kind performing a head seek to move a recording or reproducing head in a radial direction of a disk-shape recording...
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5552945 |
Transducer recalibration system and method for a rotating disk data storage
A system for infallibly positioning a transducer on Track Zero on a flexible magnetic disk in the face of possible sensing errors by an optical Track Zero sensor customarily build into a disk...
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5550447 |
Pulse generating system responding to instruction pulses for generating driving pulses for diving motor
A pulse generating unit responds to a series of instruction pulses to generate a series of driving pulses which includes alternately occurring first driving pulses and second driving pulses. The...
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5545963 |
Seek method and apparatus
A seek method and an apparatus using a stepping motor, which can eliminate disadvantages of the two-phase excitation (large seek noise and great power consumption) while maintaining advantages of...
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5452153 |
Servo controlled magnetic head positioner
A magnetic recording head positioning system includes a Terfenol-D magnetostrictive rod prestressed by a lever arm to operate in a linear range to microposition the magnetic recording head in...
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5442497 |
Head shifting device in a recording and/or reproducing apparatus
In a head shifting device where a head is shifted by a first prescribed amount for every n (≥2) drive steps of a stepwise drive source, the positioning of the head is performed in such a way that...
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5434724 |
Method and apparatus for the high speed driving of a stepper motor against seek error upon power restoration in a microcomputer system
A microcomputer system having a flexible magnetic disk drive and a controller therefor, with the disk drive including a stepper motor for incrementally moving a transducer from track to track on a...
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5408134 |
Sub-step pulse generating circuit using the period of a step pulse
A circuit for generating a sub-step pulse control signal using a step pulse in a step pulse generating circuit of a floppy disk driver included in a system such a personal computer. The sub-step...
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5311380 |
Magnetic head positioning device and method
A servo track recorded on a magnetic tape is traced by a pair of servo track reproduce heads. The output of the pair of servo track reproduce heads are subjected to a subtracting process by a...
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5264771 |
Stepping motor control system
The invention concerns with a system for controlling a stepping motor, and more particularly with a stepping motor control system which moves a head of a disk drive unit with (1-2)-phase...
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5260634 |
Constant current driving system for a stepper motor in rotating disk
In order to drive the stepper motor of a floppy disk drive with practically constant current in the face of fluctuations in supply voltage fed from a host system, a power control pulse generator...
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5231615 |
Carriage fixing apparatus and disk driver having such carriage fixing apparatus
A carriage fixing apparatus in a disk driver detects that the head carriage which moves a head is located at a predetermined position, and then automatically fixes the head carriage by means of...
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5227931 |
Stepper motor head driving device accounting for hysteresis error
A head driving device includes a head driving mechanism which is arranged to shift, relative to a recording track formed on a recording medium, a head stepwise in units of a predetermined driving...
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5182685 |
Stepper motor torque variance compensation using varied applied voltage
The present invention utilizes the output of a voltage regulator to control the drive voltage to the stepper motor driven transducer positioning system. This technique will significantly reduce the...
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5177383 |
Voice coil motor
A voice coil motor is disclosed which conveys a head of optical or magneto-optical disk drive or magnetic disk drive as a kind of a linear motor. The motor comprises a yoke member composed of a...
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5175482 |
Stepping motor control circuit
A stepping motor control circuit (50) has a step circuit (51) and a track circuit (52). The track circuit has an up-down counter (1) including an offset circuit (11), and a decoder (2). The offset...
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5130868 |
Apparatus and method for positioning a transducer for recording, reproducing or erasing information on a medium
An apparatus of the invention is capable of shifting a transducer, such as a head for erasing reproducing and recording information on a track formed on a recording medium, with fine positioning...
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5126896 |
Recording or reproducing apparatus having a head positioning, motor power control circuit
An apparatus for recording or reproducing signals by allowing a head to gain access to a recording track on a recording medium comprises a tracking device arranged to drive the head with a motor to...
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5099368 |
Method of accessing a medium with low power consumption and a recording/reproducing apparatus for realizing the same
A medium access apparatus having low power consumption includes a head driving section, an access section, a power supply section and a control signal generating section. When a medium is rotated,...
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5083230 |
Access mechanism for magnetic disk apparatus
A disk recording/reproducing apparatus is provided with a reference-point detection capability, including a device for stopping a carriage at an originating point. A control section supplies pulses...
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5079653 |
Information storage disc transducer position control system using last step damping
The output of the ring detector is used to change or control the timing of specially generated torque damping pulses which are fed to the stepper motor at the end of a SEEK step sequence. These...
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5073835 |
Head tracking system with memory for storing correct tracking positions
When a disk on which signals are recorded in a number of separate tracks is inserted into reproducing apparatus, reproduction signals from a head are first obtained and tracking is performed for...
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5060093 |
System for controlling displacement of a head in a disc storage unit
A system for controlling the displacement of a head to reduce access time in a disc storage unit having a multiphase stepping motor. While the disc storage unit receives a series of pulses...
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5041773 |
Drive circuit for stepping motor
A drive circuit for a stepping motor which seeks the read/write head of an FDD or the like to a predetermined track. The drive circuit includes a plurality of exciting coils for providing exciting...
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5040084 |
Disk drive system and method
Method and apparatus is provided for writing and reading data from a rotatable disk. Utilizing the apparatus of the present invention, the method includes the steps of formatting the disk with a...
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5032779 |
Driving circuit for stepping motor
A drive circuit for a stepping motor used for seeking the reading/writing head of a floppy disk or the like. The stepping motor is smoothly driven by inserting an inner step pulse between the input...
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5015937 |
Parametric current control for microstepping unipolar motor
A unipolar motor control system includes motor current regulation derived from monitoring battery voltage and motor temperature. The monitored battery voltage and motor temperature are inputs to a...
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5014139 |
Reference track detection for a disc storage unit
Servo information is written in advance by distinctly defining the boundary between a servo information area into which the servo information is written and a blank area into which the servo...
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