Method and device for identifying disc

Details Method and device for identifying disc Method and device for identifying disc

1996-08-09

1998-04-21

Nelms, David C.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369109, G11B 700

Patent

active

057425752

ABSTRACT:
The type of optical disc having different track pitch is identified simply. A light emitted from the LED 21 is irradiated through a condenser lens 22 onto an optical disc 1. The incident light is diffracted and reflected by the pit 3. When, if the optical disc 1 is a CD, the first order diffracted light is received by the first light receiver 10, on the other hand, if the optical disc 1 is a DVD having a smaller track pitch Pt, the first order diffracted light is received by the second light receiver 11. Therefore, the type of the optical disc 1 is identified based on a light receiving signal of the first light receiver 10 and the second light receiver 11.

REFERENCES:
patent: 5056075 (1991-10-01), Maruta et al.
patent: 5168483 (1992-12-01), Oka et al.
patent: 5289451 (1994-02-01), Ashinuma et al.
patent: 5530687 (1996-06-01), Yamaguchi
patent: 5644561 (1997-07-01), Son et al.

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