Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-06-06
1998-03-10
Huber, Paul W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369109, 369110, 369118, 369 4412, G11B 700
Patent
active
057269629
ABSTRACT:
The optical pickup device according to the present invention, includes: a light emitting diode for emitting a light beam; a collimating lens for collimating the light beam; an objective lens for focusing the collimated light beam from the collimating lens onto a recording medium; a beam splitter for splitting the light beam returned from the recording medium into two light beams; a servo error signal detector for receiving one of the two light beams and detecting a servo error signal; a diffracting element for diffracting the one of the two light beams from the beam splitter to direct the one of the two light beams toward the servo error signal detector; and an optical waveguide element for receiving the other one of the two light beams and detecting a magneto-optical signal, the other one of the two light beams from the beam splitter being incident upon the optical waveguide element without passing through the diffracting element, wherein the beam splitter is disposed between the collimating lens and the diffracting element.
REFERENCES:
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H. Sato et al., Sharp Technical Journal, vol. 50, pp. 20-24, 1991, "Optical Pickup for 90mm Magneto-Optical Rewritable Disk".
Kurata Yukio
Minami Kohji
Okada Kuniaki
Yamamoto Hiroyuki
Yoshida Yoshio
Conlin David G.
Huber Paul W.
Michaelis Brian L.
Sharp Kabushiki Kaisha
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