Disc reading apparatus using optical pick-up

Details Disc reading apparatus using optical pick-up Disc reading apparatus using optical pick-up

1998-01-20

2000-07-11

Huber, Paul W.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 32, 360 7303, G11B 509, G11B 1546

Patent

active

060883146

ABSTRACT:
A disc reading apparatus includes a microcomputer. The microcomputer calculates, based on amount data, an outer radius (RM) of an area that is recording data. The reading speed on the determined outer radius is set to a previously set speed (V.sub.2) for the outer circumference. When reading desired data, a radius of an inner circumference (r) of the data-recorded area is calculated from time information (identification data) to calculate a reading speed (V.sub.n) for reading the data. That is, since the disc contains data recorded such that the linear velocity per unit area becomes constant, the position of a pick-up and the reading speed are represented by a generally inversely proportional linear equation. Therefore, the reading speed (V.sub.n) can be calculated based on the inner radius (r) of the area recording the data to be read, the inner and outer radii (RS, RM) of the data-recorded area, and previously set inner and outer speeds (V.sub.1, V.sub.2).

REFERENCES:
patent: 5677899 (1997-10-01), Getreuer
patent: 5691968 (1997-11-01), Tomishima et al.
patent: 5780982 (1998-07-01), Tagiri

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