Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1991-05-29
1993-06-15
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, 359837, G11B 1100
Patent
active
052205533
ABSTRACT:
In an optical head, a light beam emitted from a semiconductor laser is collimated by a collimator lens and the collimated light beam is incident on a unitary structure of first and second refractive members. The first and second refractive member have first and second refractive coefficients, respectively and the first refractive coefficient is smaller than the second refractive coefficient. The light beam is refracted at an incident surface of the first refractive member, the light beam passing through the first refractive member is also refracted at an interface between the first and second refractive members and the light beam passing through the second refractive member is emerged from a exit surface of the second refractive member and is directed in a predetermined direction. When a wavelength of the light beam is varied, a refraction angle at the incident surface of the first refractive member is changed. However, a refraction angle at the inferace between the first and second refractive members is also so changed as to correct the refraction angle at the incident surface of the first refractive member so that the light beam from the exit surface of the second refractive member is guided in the predetermined direction.
REFERENCES:
patent: 4725725 (1988-02-01), Ando
patent: 4841510 (1989-06-01), Yoshizawa
patent: 4973836 (1990-11-01), Matsuoka
patent: 5105410 (1992-04-01), Maeda et al.
Ando Hideo
Nakamura Yuichi
Dunn Drew A.
Dzierzynski Paul M.
Kabushiki Kaisha Toshiba
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