| 摘要 |
An optical grating signal system for an use in a document recording system is shown having an acousto-optic modulator which utilizes the zero order beam of the modulator to scan a grating and a grating signal detector. When a modulating signal is applied to the acousto-optic modulator to generate a first order beam that records information, the intensity of the zero order beam is diminished. The same modulating signal is also applied to an amplifier which amplifies the output of the grating detector to increase the gain of that amplifier and thus maintain its output at a constant envelope level as the intensity of the zero order beam diminishes. The optics normally required to create a separate grating scanning beam are thus eliminated.
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