| 摘要 |
A desired picture or pattern such as a wiring pattern may be recorded on a recording surface bearing a photosensitive material coated thereon by sweeping a light beam obtained from a light beam source and then scanning, with the thus-swept light beam, the recording surface. A portion of the swept light beam is branched out by a half-mirror and then fed to optical sweep position detecting means. The light beam from the light beam source is modulated by a picture signal obtained in synchronization with a position signal produced by the detecting means on the basis of the thus-detected portion of the swept light beam in such a way that the thus-modulated light beam is continuously maintained, at least, at such a low light quantity level that is too small to expose the photosensitive material substantially. The method is useful for the fabrication of distortion-free printed circuits. Owing to the use of only one light beam, the method has cut the manufacturing cost of a picture recording system which is useful to practice the method.
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