| 摘要 |
PURPOSE:To provide an optical pickup device simple for adjustment with less components. CONSTITUTION:An output light beam from a semiconductor laser 1 is converged to a measurement surface through a collimate lens 2, a polarizing beam splitter 3 and an objective lens 4. A reflection light beam from the measurement surface is converged to two bisected photodiodes 7a, 7b through image forming lens 5. One triangle prism 6 whose vertical angle part 8 of the image forming lens 5 side is chamfered is used for dividing a convergence light beam from the image forming lens 5 to two directions, and interrupting a part of these convergence light beams. |
