Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1990-09-27
1992-07-21
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369110, 369 4423, 369121, G11B 700
Patent
active
051329590
ABSTRACT:
An optical head in use with an optomagnetic disk apparatus employs a polarized beam splitter when information is recorded on and read out from a recording medium. In the optical head according to the present invention, the polarization plane of the polarized beam splitter is arranged so that it makes an angle of substantially 45.degree. with the polarization angle of the polarized laser beam entering the polarized beam splitter, whereby the optical head according to this invention does not use a 1/2 wavelength plate which is indispensable to the conventional optical head. In addition, the assembly and adjustment of the optical head according to the present invention are simplified.
REFERENCES:
patent: 4599714 (1986-07-01), Endo
patent: 4797866 (1989-01-01), Yoshikawa
patent: 4797868 (1989-01-01), Ando
patent: 4841510 (1989-06-01), Yoshizawa
patent: 4965785 (1990-10-01), Tadokoro et al.
patent: 5004326 (1991-04-01), Sasaki
Envall Jr. Roy N.
Hindi Nabil
Kabushiki Kaisha Toshiba
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