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2. 发明授权

US4223354A Phase corrected raster scanned light modulator and a variable frequency oscillator for effecting phase correction 失效
标题翻译：相位校正光栅扫描光调制器和用于进行相位校正的可变频率振荡器
公开(公告)号：US4223354A
公开(公告)日：1980-09-16
申请号：US938150
申请日：1978-08-30
申请人： Milton L. Noble , Samuel E. Craig , William G. Hoefer
发明人： Milton L. Noble , Samuel E. Craig , William G. Hoefer
IPC分类号： H03L7/00 , H04N5/66 , H04N5/74
CPC分类号： H03L7/00
摘要： The present invention relates to a phase corrected raster scanned light modulator in which information modulated on a carrier is used to form a grating whose spatial frequency along the scanning line varies in accordance with the signal modulation frequency. Thickness variation in the medium on which the grating is formed causes an undesired phase modulation of the light which may be corrected by altering the carrier frequency. A novel oscillator is described which may be stepped discontinuously in frequency while the waveform and its slope remain continuous, which is of sufficient accuracy and agility to provide a real time region by region phase correction of the raster in the light modulator. The variable frequency oscillator is of high stability and can step from one value to another for intervals as short as one microsecond.
摘要翻译：本发明涉及一种相位校正的光栅扫描光调制器，其中在载波上调制的信息用于形成沿着扫描线的空间频率根据信号调制频率变化的光栅。在其上形成光栅的介质中的厚度变化导致光的不期望的相位调制，其可以通过改变载波频率来校正。描述了一种新颖的振荡器，其可以在频率上不连续地阶跃，同时波形和其斜率保持连续，其具有足够的准确性和灵活性，以在光调制器中提供光栅的逐个区域相位校正。可变频率振荡器具有高稳定性，并且可以从一个值逐步递减到一微秒的间隔。

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