Electrophotographic Printer Using LED Array

An electrophotographic printer using a light-emitting diode (LED) array light-scanning technology has been developed. This printer has the following features 1) compactness (40-cm width x 50- cm depth x 25-cm height, 2) high printing speed (3 s/letter size), and 3) high resolution (10 lines/mm). To realize this printer, two key elements have been developed. One is a large high-density LED array, and the other is a three-layered Se-SeTe-Se photoreceptor which is highly sensitive in the long wavelength region. The required conditions for the two key elements and the methods used to obtain the characteristics of the elements are discussed. The other technologies used in the printer are also explained.