Patent ID: 7280457

Claim:
An optical pickup, comprising: a container having a base and a sidewall surrounding the base to form a container space; a light-emitting device for emitting laser light disposed in the container space; a photodetector disposed in the container space; a reflective mirror disposed in the container space and between the light-emitting device and the photodetector, the reflective mirror having a reflective mirror surface angled at 45° for reflecting the laser light emitted by the light-emitting device outwardly of the container; a compound lens having opposing compound lens surfaces, a first light-receiving compound lens section and a second light-receiving compound lens section; a beam splitter having a beam splitting surface and a reflective beam splitter surface; a collimator lens; a wave plate; and an objective lens, wherein laser light from the light-emitting device is reflected by the reflective surface of the reflective mirror and is transmitted through the first light-receiving compound lens section and into the beam splitter where the beam splitting surface splits the laser beam for transmission serially through the collimator lens, the wave plate and the objective lens and for reflection from the reflective beam splitter surface and serially through the second light-receiving compound lens section and onto the photodetector, wherein the second light-receiving compound lens section has a diffractive grating formed on one compound lens surface adjacent the beam splitter and a lens section formed on a remaining compound lens surface adjacent the container, and wherein the reflective mirror surface is formed with a diffractive grating thereon and the first light-receiving compound lens section is a passage hole formed into and through the compound lens.