Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-01-15
2000-11-28
Swann, Tod R.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, 369 4414, 369 4437, 369110, G11B 700
Patent
active
061544337
ABSTRACT:
An optical head device adapted to be optically coupled to an optical disk includes a light-source laser and an objective lens optically coupled thereto. This lens receives an output light of the light source, and causes it to be projected onto the optical disk to form a focused spot thereon. Photodetectors are optically coupled to the lens in one optical path so that they are responsive to a light component which is reflected from the optical disk toward the photodetectors by way of the objective lens. A beam-shaping prism is located between the lens and a group of the light source and the photodetectors in the optical path. When the laser output light travels toward the lens, the prism reshapes the light into a predetermined isotropic beam profile. When the reflected light from the optical disk propagates reversely along the same optical path to enter the beam-shaping prism, this prism permits such an incident light to pass through itself toward the photodetectors.
REFERENCES:
patent: 5278813 (1994-01-01), Ohnishi et al.
patent: 5513164 (1996-04-01), Tanaka et al.
patent: 5615200 (1997-03-01), Hoshino et al.
patent: 5661711 (1997-08-01), Tanaka et al.
Honguh Yoshinori
Hoshino Isao
Tanaka Masahiko
Wachi Shoko
Chu Kim-Kwok
Kabushiki Kaisha Toshiba
Swann Tod R.
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