| 摘要 |
By means of an optical write apparatus 1 a rotating carrier 4 provided with a radiation-sensitive layer 5 is scanned with a radiation beam 7 which by means of a modulation device 13 is modulated in conformity with the information to be recorded on the layer. The beam is aimed at the radiation-sensitive layer 5 at a target point 20 by means of an optical system (10, 11, 12, 14, 15, 17, 18). During scanning the target point is radially moved in accordance with a predetermined motion. For this purpose the optical write apparatus 1 comprises a first actuating device 19 for the radial displacement of the optical head 16 and a second actuating device 10 for deflecting the radiation beam 7. A control device 21 controls the actuating devices 10 and 19 in such a way that the target point 20 performs a predetermined composite motion in radial direction, which motion is composed of a non-reversing motion component produced by the first actuating device and a reciprocating motion component produced by the second actuating device. This results in a very accurate low-vibration reciprocating radial motion of the target point, which enables information to be recorded along a multiple spiral by means of a single-spot write apparatus. Moreover, a very rapid and accurate recording of the information along concentric tracks is possible. |
