Patent ID: 6560188
Filing Date: 2003-05-06
Classification: G11B

Abstract:
A compound optical unit comprising:a housing; a plurality of light emitting members each including a light-emitting element that emits light of a different wavelength than at least one of the light-emitting elements of the other light emitting members, a light receiving member including a light-receiving element, and a composite optical member all integrally fixed to said housing; a first package containing said light-emitting elements; a second package containing said light-receiving element; and a multiplexor multiplexing light emitted from said light emitting members along an optical path provided in said housing; said housing including an entering/emitting opening to emit light emitted from said light emitting members and that allows light returning towards said composite optical member to enter said composite optical member; and said composite optical member disposed among said entering/emitting opening, said light emitting members, and said light receiving member.