Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1989-08-01
1991-10-22
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369109, 369284, 369111, G11B 582, G11B 700
Patent
active
050602233
ABSTRACT:
An optical type information recording medium has guide grooves for tracking formed in a concentric or spiral shape at a predetermined pitch; and a pre-format pit formed approximately midway between the guide grooves in the normal direction thereof and recording at least address information. The optical type information recording medium is constructed such that the predetermined pitch is a value ranged from 1.4 .mu.m to 2.0 .mu.m, and the depth of the pre-format pit is a value ranged from 0.46 .lambda.
to 0.58 .lambda.
where n shows the refractive index of a substrate of the medium and .lambda. shows a wavelength of a light source for reading the information recorded to the medium, and the cross-sectional shape of the pre-format pit in the normal direction is provided in a range represented by a first predetermined inequality using a function of the second degree, and the cross-sectional shape of the guide grooves in the normal direction is provided in a range represented by a second predetermined inequality using a function of the second degree.
REFERENCES:
patent: 3931459 (1976-01-01), Korpel
patent: 4230915 (1980-10-01), Dil et al.
patent: 4499574 (1985-02-01), Braat
patent: 4852076 (1989-07-01), Ohta et al.
patent: 4963464 (1990-10-01), Setani
Envall Jr. Roy N.
Ricoh & Company, Ltd.
Tran Thang V.
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