Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1987-11-16
1990-11-20
Sikes, William L.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369283, 369288, G11B 370, G11B 584, G11B 726
Patent
active
049724029
ABSTRACT:
An optical card has a track portion and a track groove portion as the guide groove on a substrate which can be irradiated with coherent light in shape of a spot to detect the tracking signal from its reflected light, characterized in that the reflectance at the track groove portion is formed lower than the reflectance at the track portion.
REFERENCES:
patent: 4584259 (1986-04-01), Mayer et al.
patent: 4587533 (1986-05-01), Nakane et al.
patent: 4606018 (1986-08-01), Sugiki et al.
patent: 4748609 (1988-05-01), Yonezawa et al.
IBM Tech. Discl. Bull.; vol. 25, No. 11A; Marks et al.; "Distillation Optical Storage"; Apr. 1983; pp. 5523, 5524.
Kawade Hisaaki
Miura Kyo
Ogawa Yoshihiro
Canon Kabushiki Kaisha
Sikes William L.
Wise Robert E.
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