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| Number | Title | Issue Date |
| 4222082 | Magnetic disk apparatus with automatic fast head advance In an apparatus for recording binary information on a flexible magnetic disk, a plate, is provided connected to an electric motor, for rotating the disk, and a spiral guide is formed on a first surface of the plate for moving a recording head radially wit... | 09/09/1980 |
| 4203140 | Helical scan VTR with deflectable head A tracking control system used in video reproducing apparatus to keep the signal head on the parallel recorded tracks in spite of speed deviations of the recording medium has a bi-morph leaf to support the head. The bi-morph leaf includes piezo-electric m... | 05/13/1980 |
| 4202020 | Magnetic head load control system A control system for applying a magnetic head onto a magnetic disk in random places thereon including a free running oscillator and switching means responsive to pulses from said oscillator and a head load command signal derived from the disk during a rev... | 05/06/1980 |
| 4191978 | Method for adjusting rotary head type magnetic video recording and reproducing apparatus A method for positioning a composite head comprising a control head and an audio head in a rotary head type magnetic video recording and reproducing apparatus at a precise spacing relative to a mounting position of the rotary head is disclosed. A video si... | 03/04/1980 |
| 4191981 | Record storage apparatus employing enhanced transducer positioning servomechanisms A sequentially operated machine employs two positionable members, a movable center selection piston member and a movable transducer member for accessing a record storage member selected by the central piston member. Making the record storage member availa... | 03/04/1980 |
| 4188645 | Piezoelectric servo for disk drive In a salient embodiment, an improved fine-positioning arrangement for mounting a recording transducer arm, comprising one or several pairs of "opposed" "piezo-flexures".... | 02/12/1980 |
| 4183067 | Helical scan VTR with means for displacing head along track direction In a VTR for recording and/or reproducing video signals in parallel tracks extending obliquely on a magnetic tape which is wrapped helically on a guide drum, rotary magnetic heads are associated with the guide drum to move in respective circular paths whi... | 01/08/1980 |
| 4180839 | Information reproducing apparatus Apparatus are disclosed for reproducing information from an information carrying tape wherein the tape is advanced by the imposition of a first force longitudinally of the tape, and wherein a second force extending into the plane of the tape at an angle t... | 12/25/1979 |
| 4171530 | System for the electronic editing of video signals The invention relates to a system for electronic editing of video signals recorded by the diagonal track method on magnetic tape, comprising a rotatable head-wheel including video recording heads and video erasing heads, a head-wheel motor in driving rela... | 10/16/1979 |
| 4162511 | Velocity correction system for video disc player A pickup cartridge for use in a velocity correction system includes a polymer bimorph element mechanically interposed between a cartridge housing and a pickup arm carrying a groove-riding stylus. Signals representative of cyclical deviations in the stylus... | 07/24/1979 |
| 4161002 | Power conserving motor control circuit for a video tape recorder A battery-operable video tape recorder includes a rotary magnetic head which during normal operation is driven at a predetermined speed controlled by a servo circuit. In the pause mode of the recorder the rotary magnetic head is driven at a lower, uncontr... | 07/10/1979 |
| 4160268 | Signal pickup device with tracking control and jitter compensation for a video disc A signal pickup device comprises a reproducing stylus for tracing a track on a rotary recording medium thereby to reproduce the information signal recorded thereon, a cantilever provided at a free distal end thereof with the reproducing stylus, means for ... | 07/03/1979 |
| 4151567 | Circuit arrangement for offsetting the data heads of a data cylinder memory by a determinate amount from the mid-position of the data cylinder A circuit arrangement offsets the data heads of a data cylinder memory by a determinate amount from the mid-position of the data cylinder and uses a fine regulating circuit and a coarse regulating circuit. The circuit arrangement includes a track differen... | 04/24/1979 |
| 4151568 | Circuit arrangement for the slow, constant forward or reverse movement of the write/read heads in a cylinder memory A circuit arrangement provides a slow, constant forward or reverse movement of the write/read heads in a cylinder memory and includes a regulating circuit which comprises a track difference register, a digital/analog converter connected to the track diffe... | 04/24/1979 |
| 4149200 | Transducer positioning system Principal embodiment teaches method and apparatus for radial positioning of a magnetic recording transducer relative to the concentric tracks of a rotatable magnetic disk having work data and servo data interspersed in alternate sectors along each track. ... | 04/10/1979 |
| 4149201 | Transducer centering system Principal embodiment teaches method and apparatus for fine positioning (centering) of a magnetic recording transducer relative to the concentric tracks of a rotatable magnetic disk having an "embedded" format (i.e., work data and servo data interspersed i... | 04/10/1979 |
| 4146911 | Head spacing control Embodiment illustrates technique for better controlling "head spacing" i.e., spacing of a magnetic transducer from the recording surface of a moving medium, such as a magnetic disk -- this involving impressing signals on the recording surface (along a giv... | 03/27/1979 |
| 4141049 | Loading mechanism for negative pressure sliders In a disk file, a mechanism places the magnetic transducer into and out of a transducing position by using the air flow generated in the file by the rotating disk. The magnetic head is biased out of contact with the magnetic disk media. As the disk media ... | 02/20/1979 |
| 4139874 | Magnetic disc recording and/or reproducing apparatus with means to damp and lock disk rotation The apparatus of this invention has an electric motor assembled integrally with a motor brake for rotating a magnetic disc, a rocking arm fitted at its tip end with a magnetic head, and a rotary solenoid to shift the magnetic head by getting engaged with ... | 02/13/1979 |
| 4135215 | Video recording format for increasing track-to-track correlation In using helical-scan-type apparatus for recording video information in parallel tracks on magnetic tape, the typical slanted arrangement of the tracks results in track-to-track shifting or offset. Tape scanning apparatus adapted for implementing an impro... | 01/16/1979 |
| 4134053 | Method and means for capturing magnetic tracks In a disc drive which does not have a head position sensor but does have a velocity detector and off-track error detection means for sensing the distance and direction of the displacement of the head from the nearest track center, and in which the directi... | 01/09/1979 |
| 4129889 | Magnetic recording/reproducing apparatus using cassette In a magnetic recording/reproducing apparatus having a support which reciprocates between reproduce and stop positions and is biased by a spring in the direction of the reproduce position, a magnetic head which is mounted such that it contacts with a magn... | 12/12/1978 |
| 4127881 | Tracking control system for magnetic video recording and reproducing system A tracking control system for a magnetic video recording and reproducing system, in which a signal is recorded on a magnetic tape as record tracks at an angle with respect to the longitudinal direction of the tape and is reproduced therefrom by rotary mag... | 11/28/1978 |
| 4120010 | Air bearing head support At the start of operation, a floating magnetic head is brought into contact with the surface of a magnetic disk and the magnetic disk is then rotated to float the magnetic head off the magnetic disk surface. At the end of operation, the floating magnetic ... | 10/10/1978 |
| 4101941 | Automatic tape run-reversing device An automatic tape run-reversing device, wherein a single-channel type magnetic head has its operative height shifted by one step, each time the run of a magnetic tape is reversed when it is taken up from one reel to another thereby enabling said single ch... | 07/18/1978 |
| 4092681 | Flexible disk file access mechanism A mechanism for moving an access arm carrying a magnetic transducer into the most appropriate position between pairs of consecutive flexible disks in a rotatable disk stack to assure that the proper disk is thereby accessed. The mechanism includes mechani... | 05/30/1978 |
| 4091427 | Electric control system for magnetic sheet recording and reproducing apparatus for audiovisual instruction Recording-reproducing apparatus utilizing as the recording medium a rectangular sheet of paper or the like having a spiral magnetic track on one surface and printed material on the opposite surface for audiovisual educational purposes. For electrically co... | 05/23/1978 |
| 4088215 | Record media compensation means for printers A printing device is provided which includes a feeler pivotally mounted on a printer frame and urged into engagement with record media positioned on a platen for printing. A magnetic element on the feeler coacts with a Hall generator on the frame to provi... | 05/09/1978 |
| 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 drive and a data-field track located furthest to such axis ... | 04/25/1978 |
| 4068268 | Method and apparatus for writing servo-tracks on rotating magnetic memory surfaces Single and double density servo-tracks are written on the servo-surface of a rotating disc pack with a single transducer carried by a transducer head assembly driven by a screw shaft. The screw shaft is incrementally rotated by a first fixed angular dista... | 01/10/1978 |
| 4068267 | Magnetic disk storage apparatus in which servo track zone provides signals for both moving speed and position of transducer A magnetic disk storage apparatus having a servo disk and a servo transducer cooperating therewith is described. The servo disk is provided with a magnetically pre-recorded concentric arrangement comprising of an inner guard zone, a servo track zone, and ... | 01/10/1978 |
| 4040103 | Shock force compensating system A system for compensating for shock force induced movement of a flying magnetic head which is positioned juxtaposed a rotating magnetic device. A chassis for supporting a rotating magnetic device and a flying head is mounted on shock absorbers to attenuat... | 08/02/1977 |
| 4025958 | Jitter prevention system for video signal processing Video signals are transferred from a phonograph record or low speed magnetic tape and stored on a magnetic sheet disc rotating at low speed. The magnetic sheet disc is then rotated at high speed to output the video signals to a television display or the l... | 05/24/1977 |
| 4023206 | Humidity sensor A humidity sensor is formed by a pair of electrodes fitted on the surface of a flexible insulator film such as a polyester film, the pair of electrodes being arranged adjacent to one another with a suitable gap therebetween. Within the gap between the adj... | 05/10/1977 |
| 4012781 | Magnetoresistive read head assembly for servo operation A transducer for servoing on data or separate servo information is fabricated with two adjacent magnetoresistive (MR) elements stagger connected such that each MR element senses one-half of the data magnetic transition track or separate coded servo tracks... | 03/15/1977 |
| 4007492 | Rotational speed monitor A circuit is disclosed for monitoring the velocity of a rotating member and determining when its speed is below a predetermined value. The circuit arrangement is designed to compare the rotational speed of the member with an asynchronous AC line frequency... | 02/08/1977 |
| 4005485 | Apparatus and method for loading and unloading transducer heads Method and apparatus for moving a plurality of transducer heads to and from an operative position adjacent the magnetic surfaces of a plurality of rotating disks in a magnetic disk storage system. The transducer heads are supported on a "T" Bar attached t... | 01/25/1977 |
| 4004205 | Hybrid servo control system A hybrid servo control system for controlling, for example a rotation of a capstan driving motor or a head motor of a video tape recorder comprises at least an integral control loop including an analog phase comparator for detecting in an analog mode a ph... | 01/18/1977 |
| 4001886 | Apparatus with headwheel servo for recording and playing back video information Apparatus for synchronizing the head wheel of a video tape recorder with the recorded signals uses a variable frequency oscillator controlled by the phase difference between recorded vertical synchronized signals and signals received from a vertical refer... | 01/04/1977 |
| 3992576 | Floating device for information disc apparatus A floating device available for use with various types of information disc apparatus, which is constructed with a floating surface providing a basis for floatation, a support member held at a predetermined distance from the floating surface, a floating bo... | 11/16/1976 |
