| 摘要 |
There is provided an optical head including a laser diode chip (1), a lens, an optical separator (7) for separating lights reflected from the object, and a photodiode chip (6) receiving the thus separated lights, the optical separator being a square pole in shape defined by a first sidewall (65a), a second sidewall (65b), second, third and fourth outer surfaces (66, 67, 68, 69) all perpendicular to both the first and second sidewalls, characterized in that the optical separator has first and second inner planes (7a, 7b) both being inclined relative to the first outer surface at a predetermined angle, the light having been reflected by the object enters the third outer surface, is reflected in and passes through the optical separator, and is received in a front light-receiving section formed on the photodiode chip, the remaining part of the light is received in a rear light-receiving section formed on the photodiode chip, and the laser diode chip is positioned so that an optical length between the laser diode chip and the first inner plane is equal to a predetermined length. <IMAGE> |
