Tracking control method for eliminating a tracking error due to

Details Tracking control method for eliminating a tracking error due to Tracking control method for eliminating a tracking error due to

1989-05-18

1991-05-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4422, G05B 100

Patent

active

050139010

ABSTRACT:
A tracking control method in which at least an objective lens within an optical pick-up is so controlled as to be driven in a radius direction of an optical disk having grooves (in a direction traversing track of the optical disk) relative to detectors of two-divided detector means for detecting reflected light quantities of reflected beam obtained by irradiating laser convergent beam of spot diameter defined by .lambda./NA on the optical disk in a manner in which a detection range is divided in the radius direction by estimating a difference information between the detected reflected light quantities, a range of the reflected beam irradiating the detectors being so set that the detectors detect the reflected light quantity equal to each other at a track-on state of irradiation point even though the objective lens moves in the radius direction.

REFERENCES:
patent: 4517666 (1985-05-01), Ando

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