Two substrates bonding type optical disk and method of producing

Details Two substrates bonding type optical disk and method of producing Two substrates bonding type optical disk and method of producing

1995-12-01

1997-09-30

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 428694SC, 428694ML, G11B 724

Patent

active

056732511

ABSTRACT:
This optical disk is two-substrates bonding type. In the optical disk, from the first transparent substrate side toward the second substrate side, at least following layers are laminated in that order; (1) the first transparent substrate, (2) the first optical film, (3) the intermediate layer, (4) the second optical film, and (5) the second substrate. The intermediate layer is formed of a dry photohardenable film of light transmissive type, which has a viscosity of 3,500 to 400,000 poises at a room temperature and in a non-hardened condition and has a thickness of 5 to 200 .mu.m in the non-hardened condition. The shapes of pits or grooves and the extent of light transmissive property are set so that both of the first pit-groove surface on the first transparent substrate and the second pit-groove surface on the second substrate can be read by irradiating the optical disk with the beam for reproduction from the first transparent substrate side of the optical disk. According to this optical disk, it is possible to improve the recording or reproducing density, transmission rate, and reproducing time while no reading obstruction is caused.

REFERENCES:
patent: 4450553 (1984-05-01), Holster
patent: 4503531 (1985-03-01), Kato
patent: 4984231 (1991-01-01), Yasuoka et al.
patent: 5077120 (1991-12-01), Kato et al.
patent: 5479382 (1995-12-01), Nishida et al.

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