Optical pickup for high-density recording/reproducing

Details Optical pickup for high-density recording/reproducing Optical pickup for high-density recording/reproducing

1996-05-16

1997-11-25

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4411, G11B 712

Patent

active

056919700

ABSTRACT:
An optical pickup for high-density recording/reproducing, which can read the information recorded at a close interval to exceed the limit of a given cut-off frequency, includes an objective lens having divided portions for respectively transmitting a zero-order optical component and .+-.1st-order diffracted components. To detect a signal for reproduction, a focusing lens is used for focusing the zero-order component and .+-.1st-order diffracted components passing back through the objective lens so as to mutually interfere. Stable high-density optical recording/reproduction can be realized regardless of the numerical aperture of the objective lens and the optical wavelength.

REFERENCES:
patent: 5579298 (1996-11-01), Opheij et al.
Patent Abstracts Of Japan, vol. 16, No. 225 (P-1360), May 26, 1992.
Patent Abstracts of Japan, vol. 017, No. 329 (P-1561), Jun. 22, 1993 & JP 05 036103.
Patent Abstracts of Japan, vol. 016, No. 580 (P-1461), Dec. 18, 1992 & JP 04 228124.
Patent Abstracts of Japan, vol. 016, No. 547 (P-1452) Nov. 17, 1992 & JP 04 205731.
Patent Abstracts of Japan, vol. 014, No. 352 (P-1085), Jul. 30, 1990 & JP 02 126429.

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