| 摘要 |
An optical information recording and/or reproducing apparatus has a detecting apparatus for detecting a tracking error signal. The detecting apparatus includes a spot forming system for forming three spots of a main spot, a first subspot, and a second subspot on an optical information recording medium, a light-receiving system for receiving reflected light from the three spots through light-receiving elements corresponding to the respective spots, a first detecting system for detecting a tracking error signal, using an output from the light-receiving element corresponding to the main spot or using outputs from the light-receiving elements corresponding to the main spot, the first subspot, and the second subspot, if there are tracking guide grooves in the optical information recording medium, and a second detecting system for detecting a tracking error signal, using an output from the light-receiving element corresponding to the first subspot and an output from the light-receiving element corresponding to the second subspot, if there is no tracking guide groove in the optical information recording medium. <IMAGE> |
