| 摘要 |
The optical head includes a light source, a reflection mirror for bending the light flux from the light source to an information recording medium, an outward and inward path light separating element for separating an outward path light incident on the recording medium through the reflection mirror and an inward path light reflected on the recording medium, an objective lens for condensing the outward path light on the recording medium, a semiconductor substrate having a semiconductor crystal layer with inclined surfaces and plane surfaces adjacent to the inclined surface, and at least one pair of photodiodes embedded in the inclined surface and the plane surface, respectively. The inward path light emanated from the outward and inward path light separating element is incident on one of these photodiodes, thereby photo-electrically converting the incident light into electrical signals. The inward path light reflected on the one photodiode is incident on the other of the photodiodes, thereby photo-electrically converting the incident light into electrical signals, resulting in acquisition of information signals and servo signals based on these photoelectrically converted signals.
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