| 摘要 |
PROBLEM TO BE SOLVED: To make the optical device applied to an optical pickup, etc., compact and nonadjustive and also to easily detect a tracking servo signal, a focusing servo signal and a magneto-optical signal or the like. SOLUTION: In this device, a light emitting part 14 and a light receiving part 15 are formed on a common semiconductor substrate 16 and the outgoing light from the light emitting part 14 is converged and radiated on an irradiated part 12 by a converging means 18 and the light receiving part 15 is arranged in the vicinity of the confocal of the converging means 18. Moreover, this device has an optical element 17 detecting the return light from the irradiated part 12 by the light receiving part 15 and a wedge prism 20 on whose surface a reflection area is formed. |
