抄録
The paper describes the light printers, especially laser beam printer and liquid crystal shutter printer. These printers are expected to be used extensivelly, ex. in a facsimile, digital copier and output terminal of electric computer and electric filing system. As the result, the number of the laid-open patents concerning these fields is increasing very much. The paper analyzes the laid-open patents and describes the trends and typical technologies of these printers.
