Multilevel image printer

Abstract

Abstract PURPOSE: To output a half tone with a larger density of picture element by modulating a laser beam with a direct control of a laser source with the output from a circuit for converting a multilevel image signal into a laser beam of corresponding intensity. CONSTITUTION: A digital signal corresponding to the density of picture element is transmitted to a selector switch circuit 14 of a multilevel image signal-laser beam conversion circuit from a multilevel image signal generator 9 to close one of switch blocks 22-1W22-8 according to the signal. Consequently, the driving voltage of a semiconductor laser 15 is determined for a laser beam source 1 so that a laser beam L is outputted in the intensity corresponding to the density of the picture element. This laser beam forms an latent image equivalent to one line on a Zerographic drum 8 with a scanner 10 via mirrors 7aW7c and the image is transferred onto a recording paper. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Tetsuo Okubo
• 👤 Yoshio Arai
• 👤 Hiroyuki Kataoka

Bibliographic Details