Fitzpatrick, Cella, Harper & Scinto
Optical information processing apparatus having offset adjusting circuit which can be exchanged together with optical head
 An optical information processing apparatus is so constructed that an optical head in the apparatus for recording and/or reproducing information by irradiating a light beam onto a recording medium is exchangeably attached to an apparatus main body, wherein a circuit which compensate for an offset of an electric signal which is output from the optical head, is attached to the apparatus main body so that it can be exchanged together with the optical head, thereby making unnecessary an offset adjustment after the optical head has been exchanged. 
Canon Kabushiki Kaisha
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Shigeru Yasuo
Aoi Suzuki