Patent ID: 6583396
Filing Date: 2003-06-24
Classification: G11B

Abstract:
An optical transducer comprising:optical detection means including a first, a second, a third and a fourth optical detector, arranged such that a first imaginary line from the third optical detector to the first optical detector crosses a second imaginary line from the second optical detector to the fourth optical detector which optical detectors generate detection signals in response to an intensity of radiation incident thereon; and signal combination means for generating a combination signal which is indicative of the sum of the electrical detection signals of the first and the third optical detector, the signal combination means generating a first, a second and a third additional combination signal, the first additional combination signal being indicative of the sum of the electrical detection signals of the first and the third optical detector, the first additional combination signal and the combination signal having a mutually opposite phase, the second and the third additional combination signal each being indicative of the sum of the electrical detection signals of the second and the fourth optical detector, the second and a third additional combination signal having a mutually opposite phase.