| 摘要 |
PURPOSE:To improve the quality of both characters and images, by varying the beam diameter between the main scanning direction and the secondary scanning direction in accordance with the images output form. CONSTITUTION:An AOM (acoustooptical modulator) 10 is provided between modulating optical systems 3 that modulate laser light. The AOM10 contains a transducer 10y which transmits the ultrasonic wave in the direction (y) and a transducer 10x which transmits the ultrasonic wave in the direction (x). These two transducers are attached orthogonally to each other. The inputs to these transducers are switched with changeover switches S1 and S2 and by a picture signal 11y of portrait type and an image signal 11x of landscape type in the form of the image output form. The direction (y) is larger than the direction (x) in terms of the beam diameter with the output form of portrait type, and vice versa with the output form of landscape type. |
