Disc apparatus having a plurality of reading/recording head driving manners for disc track seeking movement
AssigneeTEAC Corporation
InventorHikaru Tamada
Life of this patent
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Abstract
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 first driving manner or a second driving manner different from the first driving manner and the moving of the head effecting seeking of a track formed on the disc. A disc loading detecting unit detects loading of a disc in said disc apparatus. A switching unit switches over a driving manner from one to another among the first and second driving manners, wherein the switching unit selects the first driving manner while a disc is loaded in the disc apparatus and the switching unit selects the second driving manner while a disc is not the in the disc apparatus.
Claims4
A disc apparatus comprising:
- at least one head for reading information from and/or recording information to a disc;
- head driving means for driving said head on a disc in substantially radial direction thereof, the moving being executed in either a first driving manner or a second driving manner different from said first driving manner and the moving of said head effecting seeking a track formed on the disc;
- disc loading detecting means for detecting loading of a disc in said disc apparatus;
- and
- switching means for switching between said first and second driving manners, wherein said switching means selects said first driving manner while a disc is loaded in said disc apparatus and said switching means selects said second driving manner while a disc is not loaded in said disc apparatus wherein said head driving means comprises a stepper motor having a first coil and a second coil which coils generate magnetic fields of substantially different phases;
- and
- wherein said stepper motor drive said head as a result of said first and second coils being energized in a first energizing manner while said first driving manner is applied and said stepper motor drives said head as a result of said first and second coils being energized in a second energizing manner while said second driving manner is applied;
- and
- wherein a double-phase energizing period and a single-phase energizing period alternate periodically in said first energizing manner, and said double energizing period is maintained in said second energizing manner;
- and
- wherein both said first and second coils are energized in said double-phase energizing period and either said first coil or said second coil is energized in said single-phase energizing period.
Dependencies are inferred from the claim text.