| 摘要 |
In a scanning type image display apparatus that display an image by scanning a light beam emitted from a light source, synchronization of forward paths and backward paths of scanning means is achieved. The scanning type image display apparatus comprises a light source for emitting a light beam that is modulated based on image information, scanning means for scanning the light beam in two dimensional directions, a scanning optical system for forming an image of the light source on a surface to be scanned, the last surface of the scanning optical system including a reflecting area that reflects an effective light beam for forming an image on the surface to be scanned and a light transmission portion provided outside the reflecting area, light beam detection means for detecting a light beam transmitted through the light transmission portion, and a synchronization control circuit that controls light emitting timing of the light source based on a signal from the light beam detection means.
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