Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1992-07-29
1994-01-25
Bertsch, Richard A.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369178, 369191, 414273, G11B 1722
Patent
active
052821838
ABSTRACT:
The present invention relates to a position detecting apparatus for and method of detecting a position of a transport unit, wherein the transport unit is used to pick up a designated disk from a disk container containing a plurality of disks to transport the disk thus picked up to a disk playback unit. The present invention accumulates the number of pulses output by an encoder of the transport unit as the unit moves upward or downward along an encoder channel. The accumulated count is used as a position count for determining the position of the transport unit between the disk container and the playback unit. A second encoder generates a pulse train corresponding to the movement of the transport unit along the second encoder channel. The second encoder channel having a plurality of recesses spaced at a wider pitch than in the encoder channel. A comparison between the level of the pulse train generated by the second encoder and the odd or even number of accumulated pulses output by the encoder indicates whether or not pulse output has been missed. If it is determined that a pulse output has been missed, the transport unit is moved to a predetermined position, and the position count is reset to a number corresponding to the predetermined position.
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Arifuku Naoto
Okuda Kenji
Bertsch Richard A.
Pioneer Electronic Corporation
Richman Howard R.
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