Importance

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Abstract

A semiconductor laser recorder capable of reproducing pictures such as a photograph having half-tones with a high accuracy. An input signal is sampled at a predetermined sampling rate. A first signal is produced in response to a level of the sampled input signal which determines a number of high frequency pulses which are to be outputted during the sampling period. A second signal is also produced in response to the sampled level of the inputs signal which determines the width of at least one pulse which is outputted during the same sampling period. The second signal is produced only when the level of the input signal exceeds a predetermined value. The first and second signals are combined and utilized to binary modulate a semiconductor laser.

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First Claim