Copiers are widely used in China after the beginning of the 20th century. In the early 20th century, the copying of documents and drawings was mainly done by the blueprint method and the diazo method, which was more convenient and rapid than the blueprint method and was widely used.
The 1960s began the study of color copying, the method used is basically a three-color decomposition, plus black to become a four-color copying. the late 70s, in the third international conference on electrostatic photography published in the photoelectrophoresis method of a color imaging research report, which is more than the method used before and a step forward. By the 1990s there were laser color copiers.
Extended information:
In January 1966 the formation of the " The State Science and Technology Commission of the Tianjin Institute of Copying Technology" (referred to as the Tianfu Institute). 1966 Tianjin Experimental Factory (under the Ministry of the Fourth Machine) on the imported Xerox large electrostatic copier copying success; the Tianfu Institute and the Shanghai Photographic Equipment Factory, the success of the trial production of three kinds of copying machines, successively * * * production of nearly 700 units. In addition, there are 3-4 units also carried out the development of copying machinery. By the late 1960s, China's copying machinery products are still mainly diazo copiers.
From 1973 to 1983, due to the market demand, the Ministry of Machinery Industry arranged the production of electrostatic photocopying equipment by Shanghai Photocopying Machine Factory, Tianjin Photocopying Equipment Factory, Wuhan Photocopying Machine Factory, Xi'an Instrumentation Factory, Chongqing Shuguang Instrumentation Factory, Guilin Electric Meter Factory, Qingdao Photocopying Machine Factory, and Yingkou Photocopying Machine Factory.