Optical information recording device and method for detecting an

Details Optical information recording device and method for detecting an Optical information recording device and method for detecting an

1995-08-15

1999-06-01

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4437, 369112, 369 4441, G11B 700

Patent

active

059094184

ABSTRACT:
A laser light beam generated from a light source is divided by a diffraction grating into a plurality of light beams, i.e., a single main beam to be used for recording information and plural auxiliary beams distributed on two imaginary straight lines crossing each other. One of the straight lines extends parallel to tracks of a recording medium. The resultant divided beams are converged to be irradiated onto a recording medium, and reflected components, from the recording medium, of the beams are received by corresponding light receiving elements. Thus, the main and auxiliary beams distributed on one of the two imaginary straight lines are used to perform focusing and tracking. Further, one of the two auxiliary beams distributed on the other straight line are used to determine whether a track where information is to be recorded is a blank area or not, and the other of the auxiliary beams is used to verify whether the information has been recorded correctly.

REFERENCES:
patent: 4630252 (1986-12-01), Miura et al.
patent: 5144610 (1992-09-01), Horiguchi
patent: 5267226 (1993-11-01), Matsuoka et al.

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