Matches 151 - 187 out of 187 < 1 2 3 4
Match Document Document Title
4924165 Servo control system carrying out coarse control and fine control  
In a servo control system having a coarse control unit and a fine control unit, a differential gain is changed temporarily during a short period at an initial state of fine control to shorten a...
4920434 Fixed disk drive  
A higher performance, higher capacity, low cost fixed (Winchester) disk drive avoids the need of a servo surface and servo channel for head positioning by use of a mass balanced rotary actuator, a...
4908561 Servo amplifier circuit  
A servo amplifier circuit, wherein a target value is obtained based on a detected output voltage of the servo amplifier circuit, and the absolute value of the target value is amplified, and then is...
4907109 Magnetic disc drive system having automatic offset and gain adjustment means  
A magnetic disc drive system includes a magnetic head, an actuator for moving the magnetic head, a control current detection circuit detecting a control current flowing through the actuator, a...
4899234 Adaptive velocity profile for disk actuator control  
A microprocessor is used to measure the performance of a disk drive during each seek operation. By measuring track crossings per unit time of acceleration the deceleration of the servo arm can be...
4893294 Disk player and disk playing method in which tracking miss tolerance is adjusted  
A tracking miss control system for a disk player can be used in which small track misses purposely are not detected. The allowable range of the returning operation is increased with the frequency...
4809094 Method of accessing data recorded on a disk at a high speed  
Disclosed is a method of accessing data recorded in concentric circular or spiral tracks on a recording disc at high speed. A pickup at a position S on the disc is kicked to a position S' on a...
4808900 Bi-directional difference counter  
Disclosed is a servo control system for a disk drive actuator using a bi-directional (Up/Down) Difference Counter along with a control circuit therefor which signals the counter each time a "rest...
4796112 Actuator access control system for a magnetic head using trapezoidal drive current  
An actuator which carries a magnetic head of a disk memory seeks a track on the disk by being actuated by a pair of trapezoidal drive currents, which have no or less power spectrum at the frequency...
4775903 Sampled servo seek and track follow system for a magnetic disc drive  
An improved method and apparatus for performing seek and track follow operations in a disc drive provides time varying acceleration profile and track position trajectory signals which have the same...
4751441 Transducer position control system for disk storage equipment  
A method and apparatus are disclosed for positioning a transducing apparatus relative to a rotating storage medium through the use of an externally commutated positioning apparatus under control of...
4697127 Adaptive control technique for a dynamic system  
A controller for a voice coil motor driven disk file actuator is described. The device has an online adjustable gain characteristic for controlling movement of the actuator assembly and an...
4679103 Digital servo control system for a data recording disk file  
A digital servo control system for a data recording disk file receives as input a digital head position error signal (PES) and a digital signal corresponding to the head actuator input signal, and...
4677507 Digital velocity control for a disk drive servo system  
A high velocity seek deceleration technique is disclosed for seek operations of disk drives wherein measured time per track is compared to a predetermined time per track in a memory as indexed by...
4636883 Magnetic head control apparatus  
A microprocessor is provided for calculating, based on the target track address set in the target address register, the target velocity in the seek operation of the magnetic head up to the target...
4622604 Magnetic head controlling apparatus  
A controlling apparatus for achieving velocity control in the course of a seeking operation of the magnetic head includes an intended address register for storing intended track addresses. A...
4591933 Disk drive head positioner with optimized seek operation  
The track access time in a disk drive system is minimized by determining an optimum velocity profile each time the system is operated. The optimum velocity profile is determined by performing...
4547822 Head positioning servo for disk drives  
There is disclosed herein a head positioning system for a disk drive for a computer utilizing a digital head positioning system with controlled acceleration profiles during both positive and...
4544968 Sector servo seek control  
A sector servo seek control samples each sector to obtain sector time, the track identification within a sequence of track types and a position error signal for a track location to track location...
4532562 Servo control of seek operation in magnetic disk drive  
An improved method and apparatus for servo control of the position of a read/write head with respect to a magnetic disk is disclosed. The disk comprises permanently recorded position data...
4486797 Sliding mask variable resolution velocity trajectory for track following servo  
A servo system generates a velocity profile for moving a load from one position to another by dividing the time during which the load is moving into a plurality of segments, each segment being one...
4480279 Magnetic disk memory track change servo  
A disk control circuit for a magnetic disk apparatus including a magnetic disk for storing data, a carriage for supporting a first magnetic head for reading data and a second magnetic head for...
4390912 Transducer positioning system and data disk therefor  
A transducer positioning system and a magnetic disk therefor for use in a disk drive unit of a data processing system. The magnetic disk contains plural servo sectors interposed between a plurality...
4381526 Velocity control system for a data storage apparatus  
An access control system for controlling the velocity of a head assembly in a disc drive has a digital difference counter, to note the number of tracks to be traversed, a ROM to output two values...
4355273 Servo capture system  
Settling problems of a closed loop servo system are substantially eliminated by switching the servo system into position mode operation only when there is zero position error and zero velocity...
4333117 Disc head arm position controller using digital velocity sensing  
Electronic circuitry for improving the speed and accuracy of shifting the magnetic heads of a disk memory from one to another track cylinder. Head velocity is measured with great accuracy by...
4331987 Self-compensating device for a magnetic disc apparatus  
Disclosed is a self-compensating device for a magnetic disc apparatus with a velocity servo system in which an output signal of a velocity detector detects the velocity of a read/write transducer...
4237502 Disk drive system  
A disk drive for one or more spinning disks has a voice coil motor, driving the transducer carriage and controlled by two feedback loops, respectively, for hold and seek modes and enabled by a...
4217612 Servo system for track accessing and track following in a disk drive  
During the access mode of a movable magnetic head in a disk file, a program of position control signals is derived from a simulator, the input of which is clocked at sector time intervals. The...
4103314 Motion control system  
Positioning and motion control of two objects, for example, of a transducer and a disk record medium having tracks including pre-recorded servo information, is achieved in two modes of operation in...
4096579 Velocity control apparatus for disk drive  
A velocity control apparatus for a disk drive of the type comprising a recording disk rotatable about its axis, an electromagnetic read/write head for reading data from and writing data onto tracks...
4086636 Restore method and apparatus for disk drive  
A method and apparatus for restoring the electromagnetic read/write head of a disk drive from a position between a data-field track located closest to the axis of rotation of a disk loaded in the...
4086659 Control system for disk drive  
A disk drive comprises a housing having a door through which a cartridge including a recording disk therein may be inserted. A spindle drive assembly is mounted in the housing and is responsive to...
4068269 Positioning system for data storage apparatus and record medium for use therewith  
A positioning system for data storage apparatus in which a magnetic transducer is positioned relative to data tracks on a moving record member by means of a closed loop servo system. Improved...
4031443 Apparatus for positionally controlling a movable head assembly  
An apparatus for positionally controlling the movable head assembly of a magnetic disc memory unit. In a first state, the head assembly is accelerated under substantially free conditions. In a...
3936876 Rotatable data storage apparatus with track selection actuator having multiple velocities  
The invention relates to rotatable data storage apparatus of the type in which relative movement between a data transducer and a data storage medium is utilized to record data on and to read data...
3860861 DISK DRIVE HEAD POSITIONING SERVO INCLUDING TEMPERATURE RESPONSIVE SAFETY MEANS  
The specification and drawings disclose a head positioning servo system for disk drives in which the temperature of the servo motor is monitored. Power is applied to the motor only when its...
Matches 151 - 187 out of 187 < 1 2 3 4