| 摘要 |
An optical pick-up apparatus comprises a light beam generating source, an objective lens for causing a light beam from the light beam generating source to impinge upon a record medium and receiving a reflected light beam from the record medium, a beam splitter for separating the reflected light beam from the light beam impinging upon the record medium, an analyzer constituted by first and second prisms each made of rock crystal and bonded together for producing at least three light beams based on the reflected light beam, and a photodetecting unit for detecting the light beams emerging from the analyzer. The analyzer is so disposed that the reflected light beam from the beam splitter enters into the first prism to reach the second prism, an optical axis of the first prism resides in a plane perpendicular to an optical axis of the reflected light beam entering into the first prism and is inclined at a predetermined angle in relation to a plane of polarization of the reflected light beam entering into the first prism, and an optical axis of the second prism resides in a plane perpendicular to the optical axis of the reflected light beam entering into the first prism and is inclined at a predetermined angle in relation to the optical axis of the first prism.
|
