| 摘要 |
An optical head is provided that irradiates an information track in an optical disk with a focusing light to record and/or reproduce information and comprises a first light-receiving surface in which a light reflected from an optical disk is received in an interfering area in which a 0-order diffracted light and ±1-order diffracted lights from the information track interfere with one another, except for a central portion of the interfering area, and a second light-receiving surface in which the reflected light is received in the central portion of the interfering area, each of the first and the second light-receiving surfaces being divided into two regions in the direction of the information track; and an arithmetic circuit for generating a tracking error signal on the basis of a difference between outputs from the two regions into which the first light-receiving surface is divided, and for generating a tilt signal indicating an amount of tilt in the optical disk on the basis of a difference between outputs from the two regions into which the second light-receiving surface is divided.
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