| 摘要 |
PURPOSE:To facilitate easy control with no bend of an optical axis and at the same time to attain the application of LDs the same in oscillating wave length, by providing an optical multiplexing means and a means which polarizes the transmitted light in an optical path of one side of the radiated light by a micro angle, and detecting the light of one side of each light emitting means from the light given from a recording medium. CONSTITUTION:Two parallel beams are multiplexed by an interference filter 14 to make perfect coincidence between the polarizing directions and optical axes of two beams. Under such conditions, two LD beams are focused at the same point. Here a prism 24 is put into the optical path of a recording LD10a, and therefore the transmitted light of the prism 24 is polarized. Thus two spots which are separated from each other in terms of space are formed at the focused point. The reflected beams of the two separate spots are extracted by a polarized beam splitter 21. An interference filter 25 detects only the light of a regenerating LD10b and leads it to a detecting system 26 to perform record and reproduction. In this case, the operation is stable since the record and reproduction spots are separated from each other. In addition, the optical system is also controlled simply just by inserting the prism 24 after obtaining once coincidence between two optical axes. |
