Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-04-25
1995-01-03
McElheny, Jr., Donald E.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
G11B 712
Patent
active
053792866
ABSTRACT:
An optical information recording-reproducing apparatus comprising a light source, which produces a recording light beam. The apparatus further comprises, a light source producing a reproducing light beam differing in wavelength from the recording light beam, a detecting optical system for detecting a light beam passed through a recording medium, and a beam shaping prism for shaping the light beams of the two light sources into predetermined intensity distributions, the beam shaping prism being constructed of a division prism comprising at least three prisms cemented together, a polarization dividing surface for transmitting the light beams from the light sources therethrough and reflecting the reflected light from the recording medium being formed on at least one of the dividing surfaces of the division prism, and a wavelength dividing surface for directing the reproducing light beam of the reflected light from the recording medium being formed on at least one other dividing surface.
REFERENCES:
patent: 4775968 (1988-10-01), Ohsato
patent: 4888759 (1989-12-01), Hazel et al.
patent: 4918679 (1990-04-01), Opheij et al.
62-273633, May 21, 1986 English Abstract of Japanese Application.
Canon Kabushiki Kaisha
McElheny Jr. Donald E.
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