Optical pickup system incorporating therein a beam splitter havi

Details Optical pickup system incorporating therein a beam splitter havi Optical pickup system incorporating therein a beam splitter havi

1997-09-29

1999-08-17

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502015, 369112, 369 4423, G11B 700

Patent

active

059397101

ABSTRACT:
An optical pickup system reads an information signal stored on a recording surface of an optical disk. The optical pickup system comprises a light source for generating a light beam including a P and an S polarization component with a wavelength .lambda..sub.1, a 1/4.lambda. plate for changing the polarization component of the light beam transmitted therethrough, an optical detector for detecting the information signal off the optical disk, an astigmatic lens for generating an astigmatic aberration when a light beam transmits therethrough and a beam splitter, provided with a base and a phase layer, wherein the phase layer is formed by coating a first and a second material alternatively for reflecting each of the polarized light components into different directions, respectively, and the refractive index of the first material for the P-polarized light component is different from that of the second material for the S-polarized light component, thereby allowing the optical pickup system to read the information signals off the recording surface.

REFERENCES:
patent: 5331622 (1994-07-01), Ernst et al.
"Magneto-Optic and Phase Change Optical Head Design for Optical Storage" IBM Technical Disclosure Bulletin, vol. 38, No. 5, May 1995, pp. 403-406.

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