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8995244 Topographic feedforward system  
A control mechanism may control the height and/or position of a read/write head configured to interact with a rotating information storage surface. A computation unit may compute a detected...
8947989 Wobble determining apparatus and method, optical disk device, and computer program  
A wobble determining apparatus is provided with: a calculating device for calculating (i) a first time required until reaching a number of revolutions of a motor which allows a predetermined...
8897115 Topographic feedforward system  
A control mechanism may control the height and/or position of a read/write head configured to interact with a rotating information storage surface. A computation unit may compute a detected...
8897114 Topographic feedforward system  
A topography detection mechanism may measure surface height of a side read/write track while the read/write head is interacting with a current read/write track. A memory may store the measured...
8737183 Topographic feedforward system  
A control mechanism may control the height and/or position of a read/write head configured to interact with a rotating information storage surface. A computation unit may compute a detected...
8638649 Topographic feedforward system  
A control mechanism may control the height and/or position of a read/write head configured to interact with a rotating information storage surface. A topography detection mechanism may detect...
8488265 Tape storage processing  
Techniques for processing tape storage include determining a current position of a read device to read a data block from a tape storage medium having a plurality of duplicate data areas, receiving...
8369190 Proximity sensing system  
A data storage system for detecting a location of a head relative to a magnetic media is described. This system comprises arms, a preamplifier circuit coupled to the arms for controlling the arms,...
7605998 Settling judgment method for positioning control device, positioning control device and disk apparatus  
A settling judgment method judges whether an object is settled at a target position by using a settlement judgment formula set a slice value and number of continuous samples. The slice and number...
7599257 Disk drive apparatus and seek method  
The determination on the reach to a BCA by using a pull-in signal in a seek for the BCA may eliminate the necessity of a position sensor for determination of the reach to a BCA, for example, which...
7596067 Method of laser spot location and adjustment thereof  
This invention relates to a method of determining the location of a plurality of laser spots, comprising: determining a first distance of a first laser spot; determining a second distance of the...
7349313 Clamper magnetism test method for a tray-type optical drive  
A magnetism test method for a tray-type optical drive is disclosed. A preliminary input voltage is provided to a DC motor of the tray-type optical drive for performing a preliminary ejection on a...
7212481 Searching method and device for a recording medium having overlapped time address  
A method and device for searching a recording medium are provided. The recording medium has a management information area of which location information is overlapped with that of a program area....
7136339 Positioning control apparatus and method capable of reducing relative position error without increasing gain and frequency band of transfer characteristics of control system  
A positioning control apparatus for controlling a moving member to trace the position of a target member which almost equally repeats the position shift at a predetermined period comprises a...
6845073 Playback apparatus for displaying angular position based on remainder corresponding to elapsed time  
An information playback apparatus is provided, which displays the status of playback in a way more suitable to the human sense as well as detects and then displays as new information the feature...
6778482 Moving position detecting apparatus of a mobile element and a disk apparatus using the same  
A position detecting apparatus detect the moving position of a mobile element. The apparatus includes the mobile element moving reversibly along a specified running path, a conductive electrode...
6345019 Disk drive system with releasing apparatus  
Disclosed is a thread servo of a disk drive system, in which a slide mechanism is driven on a slide drive signal generated from an error signal of the slide mechanism. When a precursory phenomenon...
6320824 Method and apparatus for controlling and reversing the position of optical pickup head  
A first electrically conductive member is provided on a control portion of a limit position switch for detecting whether or not an optical pickup head reaches a predetermined limit position. A...
6288994 Apparatus for recording and/or reproducing information and/or from optical information record disk  
An apparatus for recording and/or reproducing information on and/or from a magneto-optical disk including an optical head for projecting a laser beam onto a magneto-optical disk and receiving the...
5519686 Encoder for controlling measurements in the range of a few angstroms  
An encoder includes an electrically conductive reference scale having surface steps formed at predetermined positions; an electrically conductive probe having a tip disposed opposed to the...
4849955 Moving device for an optical recording system in a high density spiral track-forming apparatus  
A high density spiral track forming apparatus according to the present invention includes a linear motion mechanism for moving an optical recording system in a radial direction of a disk-shaped...
4779170 Phonograph record illumination device and system  
An illumination device (10) for a phonograph record (18) has a housing (14) and bolts (22) for attaching the housing (14) to a phonograph tone arm (12). A battery (26) in the housing (14) and a...
4577304 Device for correcting audio record's groove eccentricity  
A device for correcting audio record's groove eccentricity consists of an arm mounted on one end on a base and having on the opposite end a pin-like device which can track the audio record...
4491884 Method of monitoring head alignment in a magnetic data storage device  
A method for monitoring the alignment of the read-write head of a magnetic media data storage device comprising the steps of: establishing an elasped time window during which the read-write head...
4477893 Tone arm device  
A tone arm device for a turntable in which the tone arm is mounted upon an inner movable member rotatably supported on an outer movable member freely rotatable with respect thereto. The rotational...
4476503 Method for the recognition of an edge of a magnetic medium and a device for implementation of the method  
When setting a write gap or a read gap to a recording track on a magnetic medium, an edge of the medium is selected as a starting point, proceeding from which the write and read means are...
4361880 Programmable automatic record player  
A pickup arm is equipped with a photo sensor assembly for detecting non-recorded portions on a disk. The sensor is located in such a position that horizontal distance between the stylus tip and...
4337532 System for controlling the change of read side for an optical reader for an information carrier  
System for changing the read side on a transparent carrier carrying information recorded on both sides. Reading is carried out by means of an optical device focusing a light beam onto one...
4326283 Cartridge alignment system  
A stereo stylus playback cartridge alignment system is disclosed in which the cartridge is aligned in accordance with and based upon the Baerwald formulae at an optimum position and angle so that...
4211421 Video disc player having adjustable end-of-play switch  
A player, such as a video disc player, includes a signal pickup carriage, which carries a travel-limit switch and which is translated during playback toward the turntable center in correlation...
4205854 Record players  
A record player having a tone-arm and a gimbal mounting for the tone arm, the gimbal mounting having bearings and at least one of the bearings having an elongate member through it for effecting...
4171136 Reproducing apparatus for a disk-shaped recording medium  
A reproducing apparatus for a disk-shaped recording medium, wherein a pickup detects signals from a rotating disk-shaped recording medium in contact with the latter. The reproducing apparatus is...
4079944 Cueing device for phonographs  
The cueing device, to facilitate the operation of bringing the stylus of a phonograph pickup into engagement with a selected unrecorded zone of a phonograph record, so that the next recorded zone...
3870319 DICTATING AND PLAYBACK APPARATUS  
A combination dictating and playback apparatus having a single transducer and tone arm, cooperable with a pregrooved disc, with means to automatically switch from recording condition to playback...
3609562 SYNCHRONIZED DEMODULATOR  
This invention relates to a demodulator used in a servo-positioning system which is maintained in synchronization both during the track-seeking mode and the fine-positioning mode of operation of...
3521011 SIMPLE DISC-RECORDING AND TRANSCRIPTION APPARATUS  
1,193,088. Disc recording and playback. TOMY KOGYO CO. Ltd. 4 Dec., 1967 [21 Sept., 1967], No. 55109/67. Heading G5B. A record blank 15 is held on a turntable 11 by a coaxial disc 16, which is...
3281150 Track selector for phonograph pick-up  
3279799 Sound recording and reproducing apparatus  
3273894 Talking book apparatus  
3243189 Electrical indicating means for tape recording machines  
3238644 Child's switchboard phonograph  
3183004 Record player indicator  
3179418 Magnetic sound recording and reproducing dictation appliance  
920,605. Magnetic sleeve recorders. PHONO-ELECTRIC A.G. Dec. 29, 1961 [Feb. 9, 1961], No. 46586/61. Class 40 (2). A machine using foldable, grooved, sleeve-form records, has a radially-expandible...
3178189 Phonograph accessory  
3096983 Indicating and place-finding apparatus for phonographic machines  
3079159 Dictating machine  
2990184 Apparatus for synchronizing transducer head scanning motion in sound recording and reproducing machines  
2977125 Repeating mechanism  
2967715 Miniature recording device  
2958949 System for measuring the use of a phonograph needle  
Matches 1 - 50 out of 131 1 2 3 >