Optical information recording/reproducing device capable of reco

Details Optical information recording/reproducing device capable of reco Optical information recording/reproducing device capable of reco

1993-08-17

1995-03-21

Pascal, Robert J.

Dynamic information storage or retrieval

Alternative diverse types of storage or retrieval

369 4437, 369 4438, G11B 1300, G11B 700

Patent

active

054003083

ABSTRACT:
According to the optical information recording/reproducing device of the present invention, upon recording of information, when a pit image on an optical detector which is formed by a recording optical beam spot at an information recording time arrives at a position of a O-order diffraction light spot image, while an optical card is moving in the forward direction, a light receiving element for signal reproducing senses a change in light amount. A verify signal is obtained immediately after recording based on the light amount change to perform a verify operation. Further, when a pit image on the optical detector formed by the recording optical spot arrives at a position of the image of the primary diffraction optical spot while a moving direction of the optical card is reversed and the optical card moves in the reverse direction to perform recording, a signal reproducing light receiving element senses a change in light amount. A verify signal is obtained immediately after recording based on the light amount change to perform a verify operation. Since irradiation is made in which the space between the recording optical spot and the O-order diffraction light spot is made equal to the space between the recording optical spot and the primary diffraction light spot b, an optical detector can receive the verify signal at the same timing even if the optical card moves in the forward or reverse direction.

REFERENCES:
patent: 4730293 (1988-03-01), Pierce et al.
patent: 5027339 (1991-06-01), Yoda et al.
patent: 5153863 (1992-10-01), Noda et al.
patent: 5184340 (1993-02-01), Kachi et al.
patent: 5247504 (1993-09-01), Akatsuka
patent: 5267226 (1993-11-01), Matsuoka et al.
patent: 5293365 (1994-03-01), Rokutan
patent: 5293366 (1994-03-01), Ohta

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