Tracking signal error generator for optical information devices

Details Tracking signal error generator for optical information devices Tracking signal error generator for optical information devices

1984-11-30

1987-04-21

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

G11B 708

Patent

active

046601910

ABSTRACT:
A tracking error signal generator includes first, second, and third light receptors for receiving light fluxes reflected from a recording medium and for generating respective first, second, and third output signals. The light fluxes impinge upon the recording medium along a line having a predetermined angle with respect to a recording track. In an embodiment, the tracking error signal is set to the difference between the first and second output signals if the difference between the first and third output signals is less than zero or to the difference between the second and third output signals if the difference between the first and third output signals is greater than zero. In a second embodiment, if the difference between the first and third output signals is within, below, or above a preselected range, the tracking error signal is set to the difference between the first and third output signals, the first and second output signals, or the second and third output signals, respectively.

REFERENCES:
patent: 4338682 (1982-07-01), Horaka et al.
patent: 4541084 (1985-09-01), Oku et al.
patent: 4542491 (1985-09-01), Takasago et al.
patent: 4561080 (1985-12-01), Yamayaki

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