| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase a scanning field angle without decreasing image resolution and ranging accuracy and without increasing magnitude of a driving signal. <P>SOLUTION: An optical scanner comprises: first scanning means 2 that comprises a first movable plate 2c including a first light reflecting surface 2a, is arranged so that a reflection point of the first light reflecting surface 2a, when projected to a reference plane including an ellipse, coincides with one focus F1 of the ellipse, and reflects and scans incident light entering the first reflecting surface 2a by oscillation of the first movable plate 2c; an elliptical mirror 4 that includes a reflecting surface 4a which is curved along the arc of the ellipse on the long axis side, and reflects incident light from the first scanning means 2; second scanning means 3 that comprises a second movable plate 3c including a second light reflecting surface 3a, and that is arranged so that a reflection point of the second light reflecting surface 3a, when projected to the reference plane, coincides with the other focus F2 between the focus F1 and the elliptical mirror 4 and so as to be located opposite to the first scanning means 2 with respect to the reference plane; and driving means 5 that supplies driving signals to each scanning means. <P>COPYRIGHT: (C)2013,JPO&INPIT |
