| 摘要 |
An optical head has a first light source; a second light source; a transmitting and reflecting element having a first surface and a second surface, and used to reflect diverging light from the first light source at the first surface, and to allow diverging light from the second light source to enter the second surface and to go out from the first surface, thereby to synthesize optical paths; an objective lens for converging light from the transmitting and reflecting element on an information recording surface of an optical disk and for condensing light reflected from the disk; and a photo-detector for receiving the reflected light, wherein the first surface and the second surface of the transmitting and reflecting element are not parallel to each other in order to decrease aberration when the diverging light from the second light source passes through the transmitting and reflecting element.
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