Diazo Imaging Technology

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  • ジアゾ作像技術
  • ジアゾサクゾウ ギジュツ

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Abstract

Recently, we hardly see a blueprint in a daily life. The blueprint is a name instead of diazo copy. Because the mainstream of image copied by using the diazo reprography process was blue image, diazo copy was called a blueprint. The diazo paper and the copying machine were the reprography process that become popular widely from 1955 to 1975 in this country. The image formation process consists of two characteristics property of diazonium salt that was applied to the diazo paper. First, the diazonium salt is decomposed by photoirradiation and becomes colorless compound. Secondly, the diazonium salt which was not decomposed generates a colored azo dye by reacting with a coupler. By using this characteristic of diazonium salt, the posi-posi image is generated by passing through an exposure process and a developing process. Because of low price and easily operation, the diazo reprography process had been used in a large quantity of copy uses of the drawing and so on in various business field. In this article I would like to explain about the change of the diazo reprography process that is one of the diazo imaging technology.

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