| 摘要 |
PURPOSE:To decrease the number of built-in parts of optical parts, and to improve a commodity value and reliability by constituting a titled pickup so that the optical parts are installed to a stand, it is supported by a plate spring, and a rotation to an optical axis is adjusted, rotating the optical parts around the optical axis. CONSTITUTION:A grating 2 and a lambda/4 plate 3 are guided and fitted into grooves 24-1, 24-2 and 29-1, 29-2 provided on stands 60, 61. In a state inserted in this way, the photodetecting surfaces of the grating 2 and the lambda/4 plate are vertical to an optical axis (p)-(p), and also each photodetecting surface is parallel. In this state, a plate spring 25 is fitted to the upper part of the grating 2 and the lambda/4 plate 3, so that the grating 2 and the lambda/4 plate 3 do not fall out of the stands 60, 61, also they are held by an elastic force of arms 251, 252 of the plate spring 25, and the built-in process of the grating 2 and the lambda/4 plate 3 to a pickup case 1 is completed. |
