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7312945 Techniques for adjusting for actuator non-linearities in a data storage system  
The invention provides techniques for adjusting for actuator non-linearities in a data storage system. The invention is particularly useful for piezoelectric actuators, such as actuators that...
6704158 Shear mode multilayered collocated micro-actuator for dual-stage servo controllers in disk drives  
A head gimbal assembly for a disk drive. The head gimbal assembly includes a load beam defining a longitudinal axis. The head gimbal assembly further includes a flexure with a portion of said...
6600619 Vibration control of piezoelectric microactuator  
A system and method for controlling vibration of a piezoelectric microactuator in a disc drive are disclosed. The mechanical strain on the piezoelectric microactuator is ascertained and fed back to...
6216050 Actuator control apparatus and magnetic disk unit  
An actuator control system and a magnetic disk device having a hybrid control system. The actuator control system includes an LPF that can be processed by the hardware architecture of a HDD that...
6118613 Electromagnetic actuator drive circuit  
An electromagnetic actuator drive circuit suppresses mechanical resonance which occurs in a magnetic head or an optical device whose position is controlled and giving a very small displacement to...
6115204 Rotary head type magnetic recording/reproducing apparatus employing dynamic closed loop and semi-closed loop or open loop tracking systems  
A rotary head type magnetic recording/reproduction apparatus according to the present invention includes a recording format in which a plurality of pilot signals of different frequencies are...
5969898 Method and system for reading data that is unreadable by a tape drive  
A method and system for reading data containing errors due to curved or displaced tracks in a track region reproduced by reproducing heads in a tape drive includes a signal processing circuit for...
5963388 Signal recording or reproducing apparatus  
During recording, a system controller 12 controls a travel control unit 4 to make a magnetic tape travel in a forward direction or a reverse direction at a constant speed and controls a drive motor...
5933289 Magnetic recording/reproducing device with wireless transmission of position control signal to head transducer on rotary drum  
The present invention provides a movable magnetic head unit including a signal transmission element. The transmission element transmits by wireless, i.e., through noncontact transmission, a control...
5880953 Control system and information recording and reproducing apparatus  
An actuator moves a signal reproducing element based on an applied control input. An error detector detects a difference in relative position between a desired track and the signal reproducing...
5870244 Magnetic recording/reproduction apparatus and method for adjusting head height therein  
The relative height between two sets of magnetic head groups shared for recording and reproduction and mounted on actuators is adjusted at high accuracy, so that a track of a predetermined track...
5867336 Apparatus and method for rotary head height measurement  
In a rotary head height measuring system 50, a peak position detector 51 detects peak positions of output signals of rotary heads 62-65 mounted on a magnetic recording and reproduction system 60. A...
5684652 Rotary magnetic head device using plural magnets and coils to position plural magnetic heads  
A rotary magnetic head device has a plurality of bobbins to which coils are respectively fixedly attached, and a place spring fixedly attached to the bobbins. The plate spring has a plurality of...
5682076 Ceramic disc-drive actuator  
A paired piezoelectric micromotor for providing motion relative to a body, including two rectangular piezoelectric plates, each piezoelectric plate having first and second long edges, first and...
5654843 Method and apparatus for following curved tracks on a tape  
In a method for performing magnetic recording and reproducing an apparatus is used which includes a magnetic head carried by a piezo-electric movable element, the position of the magnetic head is...
5646803 Rotary magnetic head device with head base and transducer having linear expansion coefficients in a similar range  
A rotary magnetic head device in which the amount of protrusion of a magnetic head with changes in temperature is comprised within a pre-set range for assuring stable contact between the magnetic...
5566378 Movable head position controlling device for magnetic recording and reproducing apparatuses  
A movable head position controlling device for magnetic recording and reproducing apparatuses. The position of a magnetic head is detected. The magnetic head is driven by an actuator in accordance...
5521769 Magnetic tape drive with displaceable head capable of a re-try operation  
A magnetic tape drive in a helical scan system can shorten retry operation time. A data signal reproduced from magnetic tape through reproducing heads is supplied to a regenerative signal...
5513051 Image signal recording and reproducing apparatus having a quasi-fixed head  
An image signal recording and reproducing apparatus comprises a head array having a plurality of head gaps for recording and reproducing the image; a piezoelectric actuator having a polarization...
5502606 Rotary magnetic head device having plural magnetic heads which are independently movable  
A rotary magnetic head device has a plurality of bobbins to which coils are respectively fixedly attached, and a plate spring fixedly attached to the bobbins. The plate spring has a plurality of...
5500777 Magnetic head drive which uses independently controlled piezo-electric elements  
In a magnetic head drive for a magnetic tape recorder of a helical scan system, a pair of first and second longitudinal bimorph elements fixed to a support member is connected to a flexible bridge...
5463506 Head drum apparatus  
A head drum apparatus includes a cylindrical piezoelectric ceramic member formed of a polarized ceramic material and having inner and outer peripheral surfaces. A plurality of electrodes are formed...
5450256 Rotary head adjuster  
A head base has at least one head chip fixed thereto. A position of the head chip is adjusted to a predetermined position by applying a laser beam to the head base to cause plastic deformation of...
5444581 Rotary head for use in a magnetic recordiang and reproducing apparatus wihich includes height adjuster  
A rotary head for use in a magnetic recording and reproducing apparatus includes a fixed cylinder, a rotary cylinder opposed to the fixed cylinder, two electrically controllable movable elements...
5432658 Rotary-magnetic-head dynamic track following device  
In a rotary-magnetic-head dynamic track following device of the present invention, a coil for generating a controlling magnetic field that shifts a magnetic head along its rotation axis, a magnet...
5402279 Tracking apparatus for helical scan video tape recorders  
A tracking apparatus for helical scan video tape recorders comprises four movable video heads situated on a scanning drum such that phase compensation information can be determined using the...
5384676 Magnetic head position controller in a magnetic recording and reproducing apparatus  
In a magnetic recording and reproducing apparatus having a solenoid-driven actuator to move a magnetic head in the tracking direction, a magnetic head position controller includes a state estimator...
5379164 Helical scan system information signal recording/reproducing apparatus using control signal phase data and head height data from memory during control signal drop out  
A helical scanning type recording/reproducing apparatus provided with a dynamic tracking head which is moved in a direction perpendicular to a recording track on a magnetic tape and which is...
5373404 Helical scan type rotary head drum unit  
The present invention relates to a rotary drum unit in a helical scan type magnetic recording/reproducing device for use with a video tape recorder, digital audio tape recorded, or the like and is...
5343334 Video tape that records, plays back, and rerecords video signals to overcome dropouts  
In a video tape recorder, recording and reproducing heads record and reproduce a recording signal on recording tracks which are diagonally formed one after another on a tape-like recording medium....
5343342 Magnetic recording and playback system with feedback control of a movable transducer head  
In a magnetic recording/playback system having a magnetic head drive device for moving a movable head disposed within and mounted to a rotating upper drum in parallel with the axis of the drum, and...
5343348 Actuator for displacing a magnetic head  
A magnetic head actuator for displacing a magnetic head on a rotary magnetic head drum in a magnetic recording and reproducing apparatus includes a hollow cylindrical yoke housing a permanent...
5331480 Dynamic tracking reproduction apparatus  
A dynamic tracking reproduction apparatus comprises an actuator for driving a magnetic head in a width direction of recording tracks formed on a recording and reproducing tape; error detector for...
5313347 Rotating magnetic head for a magnetic recording reproduction system  
A rotating magnetic head for a magnetic recording reproduction system. The rotating magnetic head detects the position of the rotating head placed on the periphery of a rotating drum, and perform...
5274515 Tracking control device for a video tape recorder  
A tracking control device for controlling the positions of magnetic heads mounted on bimorphs relative to a recording medium. The device comprises means for detecting the transport speed of the...
5270891 Vertically distant magnetic head units with piezoelectric error tracking  
In a helical-scan magnetic-tape apparatus having a scanning unit (102) comprising two diametrically opposed rotatable magnetic-head units (113, 114) which are movable over an actuating distance (A)...
5270529 Device for sensing rotary head position of magnetic recording and reproducing apparatus  
An apparatus of sensing a position for a recording and reproducing device, having first and second light receiving devices of the same photoelectric transfer characteristic, a light emitting device...
5256850 Azimuth adjusting method for magnetic head  
An azimuth adjusting method for a magnetic head, which includes the steps of forming first and second depressions respectively on a main surface and a reverse surface of the main surface of a...
5255140 VCR magnetic recording head for both digital and VHS format  
A double azimuth four-head drum may be made to be jointly usable in a digital VCR and VHS-VCR. A piezoelement is respectively installed between the head drum and the first standard play channel...
5247404 Magnetic recording and reproducing apparatus with magnetic head displacement correction  
A magnetic recording and reproducing apparatus of the helical scanning type, such as a videotape recorder and a DAT (Digital Audio Tape Recorder), in which a magnetic head is controlled so as to...
5241434 Magnetic recording signal reproducing apparatus  
The specification discloses a magnetic recording signal reproducing apparatus for controlling a magnetic tape and reproducing magnetic heads. In the magnetic recording signal reproducing apparatus...
5223992 Rotary magnetic head device in magnetic recording and reproducing apparatus  
A rotary magnetic head device in a magnetic recording and reproducing apparatus such as a VTR apparatus and a DAT apparatus which adopts a helical scanning system. In order to prevent the...
5210663 Tracking control device and magnetic recording and reproducing apparatus using the device  
A tracking control device and a magnetic recording and reproducing apparatus including the tracking control device, the tracking control device comprising means for detecting track data recorded on...
5187617 Apparatus for reproducing digital video signal  
A digital video signal reproducing apparatus adapted for reproduction of a magnetic tape where video data of one field are recorded on a plurality of tracks by a plurality of rotary heads. Playback...
5184254 Playback apparatus for playing back video information recorded on magnetic tape and providing smooth-frame still or slow motion video  
There is disclosed an improvement in an apparatus of the helical scan type for playing back of information signals prerecorded on a magnetic tape along tracks inclined with respect to a running...
5182683 Position control of a magnetic head in a magnetic recording and reproducing system  
A magnetic recording and reproducing apparatus for reproducing information from a track recorded on a magnetic tape made to travel by being driven by a capstan. Even if a track has been recorded in...
5181146 Apparatus for digitally recording and reproducing video and audio signals in skewed tracks on a record tape  
In an apparatus for digitally recording and reproducing video and audio signals in successive parallel slant record tracks on a record tape; pluralities of recording heads are mounted on a rotary...
5166848 Automatic scan tracking mechanism  
An improved head mounting structure which disposes a beam-like head support assembly for movement about a center hinge. A magnetic recording head is supported at an outer end of the head support...
5166850 Rigid, wedge-shaped mounting structure for minimizing resonances to allow rapid transverse movement of an attached head  
An improved head mounting assembly includes a wedge-shaped rigid head support member which minimizes resonances when operating at rapid transverse head movements, and which operates in conjunction...
5157563 Magnetic recording and reproducing apparatus using an electromagnetic actuator for automatic tracking  
A magnetic recording and reproducing apparatus for performing automatic tracking in a video tape recorder of a helical scan type. A magnetic head is wobbled by an electromagnetically driven...
Matches 1 - 50 out of 157 1 2 3 4 >