Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-01-06
1998-06-16
Young, W. R.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 50, G11B 700
Patent
active
057682330
ABSTRACT:
A track on the disk is divided into plural concentric zones on the radial position thereof. During recording, the angular velocity varies according to the zones accessed for recording, and the disk is driven at a rotational velocity whereby the angular velocity is constant within any single zone but decreases as the radial position of the zone of the accessed track approaches the outside circumference of the disk. During reproducing, the disk is driven at a rotational velocity whereby the angular velocity is constant in all zones. The range of change in the relative linear velocity of the head to the track is thus smaller and the change in the recording conditions is less during recording. During reproducing, there is no delay time required for rotational control of the disk, and the desired track can be more quickly accessed.
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patent: 5182741 (1993-01-01), Maeda et al.
patent: 5243587 (1993-09-01), Itoh et al.
A. W. Smith, "Injection Laser Writing on Chalcogenide Films," Applied Optics, vol. 13, No. 4, Apr. 1974, pp. 795-802.
Akahira Nobuo
Nagata Ken'ichi
Nishiuchi Ken'ichi
Ohno Eiji
Yamada Noboru
Matsushita Electric - Industrial Co., Ltd.
Young W. R.
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