Harvesters
Patent
1989-01-23
1992-05-19
Levy, Stuart S.
Harvesters
3692751, 369284, 369286, 3461351, G11B 724
Patent
active
051154242
ABSTRACT:
An optical type information record carrier is disclosed which includes an arrangement wherein the depth of the guide grooves is selected to be about (2N+1).lambda./8n (N=1, 2, 3, . . . ) and the inclination angle of the wall surface of the carrier is steep enough to ensure that the information recording medium will not adhere to the wall surface of the guide grooves, or will only adhere very weakly if it does adhere. Thermal conduction at the wall surface of the guide grooves is prevented so that extension of the recording bits is restricted.
REFERENCES:
patent: 4230915 (1980-10-01), Dil et al.
patent: 4547875 (1985-10-01), Ohta et al.
patent: 4586173 (1986-04-01), Ando
patent: 4731755 (1988-03-01), Bjorklund et al.
patent: 4734904 (1988-03-01), Imanaka et al.
patent: 4930116 (1990-05-01), Dil
Nakajima Hajime
Tanaka Kunimaro
Watanabe Isao
Levy Stuart S.
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Hoa
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