| 摘要 |
An emitted-light checking apparatus receives laser beam which has been emitted from a laser diode of an optical pickup subject to check. The laser beam travels through a cylindrical lens provided for producing astigmatism, and then enters a light receiving device that includes an optoelectronic integrated circuit having a receiving surface split into four receiving areas arranged in the upper-right, upper-left, bottom-right and bottom-let positions.
|
