Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1984-10-18
1987-05-05
Faber, Alan
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 46, 250201, G11B 709
Patent
active
046637508
ABSTRACT:
A focus error detection device to be used in an optical system for recording and/or playing back information, including a light detector made up of four light receiving elements arranged symmetrically with respect to the center of the light detector, a multiplication means for generating a pair of multiplication signal by multiplying output signals of two light receiving elements which are arranged symmetrically with respect to the center of the light detector. The multiplication signals are applied to a subtraction means where the focus error signal is generated by the subtraction between the multiplication signals. Thereby the off-set of the focus error signal which has been caused by the deviation of the position of the center of the light beam from the center of the light detector is by far reduced.
REFERENCES:
patent: 4057833 (1977-11-01), Braat
patent: 4163149 (1979-07-01), Sawano
patent: 4446545 (1984-05-01), Dijk
Hamanaka Kenjiro
Nozu Shinsaku
Sato Katsuharu
Tanaka Hozumi
Faber Alan
Pioneer Electronic Corporation
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