Pickup device

Details Pickup device Pickup device

1992-05-22

1994-02-01

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369121, G11B 700

Patent

active

052837785

ABSTRACT:
A pickup device can detect the frequency (pit length) recorded in the recording medium, and read out data signals from the optical disk at high S/N. Further, the data read speed is considerably increased since it is possible to concurrently read data signals from the tracks. In a pickup device, a linear light beam emitted from a light source is projected onto an optical disk through a condenser lens so as to form an image thereon, which is long enough to cover three recording tracks on a recording medium. Signal light reflected on the recording medium is imaged on a photo detector consisting of an array of detecting elements, and is detected and output by and from the photo detector. A frequency analyzer unit analyzes the frequencies of the detected signals. A computing circuit calculates the output values for each analyzed frequency. Accordingly, it is possible to separate the frequencies of the recording tracks from each other.

REFERENCES:
patent: 4510544 (1985-04-01), Lazzari
patent: 4550249 (1985-10-01), Damen et al.
patent: 5038332 (1991-08-01), Sakagami et al.
patent: 5081617 (1992-01-01), Gelbart
patent: 5113386 (1992-05-01), Whitehead et al.
patent: 5132953 (1992-07-01), Matsubayashi
patent: 5144603 (1992-09-01), Mozume et al.
European Search Report dated Mar. 31, 1993.
Patent Abstract of Japan, vol. 19, No. 155 (P-12) Apr. 7, 1982.

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