An optical information processing apparatus for at least either recording or reproducing information by irradiating converged light beam on a recording medium. The optical information processing apparatus comprises a light detector for receiving the light beam, a neuro network for inducing a tracking or focusing error signal from an output signal from the light detector, and servo means for performing a tracking or focusing servo in accordance with an error signal induced by the neuro network. <IMAGE>
Optical information processing apparatus having a 'neuro network' for inducing an error signal