Disc player capable of calculating the travel time of the optica

Details Disc player capable of calculating the travel time of the optica Disc player capable of calculating the travel time of the optica

1996-02-23

1997-03-04

Dinh, Tan

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, 369 58, G11B 1722

Patent

active

056087020

ABSTRACT:
A light pickup 4 is adapted to receive reflected light from a disc 1 and to input a signal into a determination means 12 while moving in the radial direction of the disc 1. The determination means 12 not only determines the current position of the light pickup but also calculates the time required for the light pickup 4 to move until reaching the signal-recording inner circular end of the disc, on the basis of the signal from the light pickup. The determination means 12 determines that no disc is set when there is no reflected light from the disc. The determination means 12 determines the size of the diameter of the disc 1 on the basis of the current position of the light pickup 4. The disc player has a structure in which it is not necessary to provide a switch for detecting the signal-recording inner circular end of the disc, a sensor for detecting the size of the diameter of the disc and a sensor for detecting whether or not the disc is set.

REFERENCES:
patent: 4855978 (1989-08-01), Kanamaru
patent: 4910722 (1990-03-01), Kaji et al.
patent: 5088075 (1992-02-01), Yokota
patent: 5315568 (1994-05-01), Dente et al.
patent: 5337296 (1994-08-01), Okubo
patent: 5438557 (1995-08-01), Ito et al.

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