ISODENSITY RECORDING SYSTEM

摘要

An improved density recording system is described in which a material carrying a density pattern thereon is scanned two-dimensionally to measure its density, the output of the density measurement section being led to a discriminator circuit to discriminate predetermined voltages, and thereby isodensity curves are plotted, similarly to that disclosed in the copending U.S. Pat. application Ser. No. 45,952. The improvement exists in that an alternating voltage having a waveform such as sinusoidal, rectangular, o saw-tooth waveform or the like having a total amplitude larger than the width of the blind zone set up by said discriminator circuit is superposed on the output of said density measurement section, whereby the cut-away sections in isodensity curves which would occur at the curve sections which are parallel to the direction of line scanning in the case of the prior art density recording systems may be obviated and made continuous.