| 摘要 |
An optical information processor reads information from a storage medium or writes information on a storage medium by irradiating it with light radiated from a light source. The processor includes: the light source for radiating the light; a condensing element for converging the light, radiated from the light source, toward the storage medium; and a detector for detecting a portion of the light radiated from the light source. Supposing that in a far-field pattern of the light radiated from the light source, an aperture area A is defined by a portion of the light entering the condensing element and a photosensitive area B is defined by another part of the light entering the detector and that the light has the narrower angle of radiation in an x direction and the wider angle of radiation in a y direction, respectively, the center of the photosensitive area B in the x direction is offset with respect to that of the far-field pattern in the x direction.
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