COPYING METHOD FOR DOCUMENT FOR COPYING PREVENTION

PURPOSE:To easily obtain a copy image of the document for copying prevention by exposing the document for copying prevention whose no-image area other than an information image area is specular through a mesh body which has a double spread of specific size. CONSTITUTION:When a copy is taken by an el...

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Bibliographic Details
Main Authors HIRANO NOBUHIRO, NAGAHAMA HITOSHI, KAGAMI MASASHI, KOMATA HIROTSUGU, TSUJITA MITSUSHI, NAKAZAWA SUSUMU, INOUE KAZUE, TSUTSUMI AKIRA
Format Patent
LanguageEnglish
Published 31.05.1989
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PURPOSE:To easily obtain a copy image of the document for copying prevention by exposing the document for copying prevention whose no-image area other than an information image area is specular through a mesh body which has a double spread of specific size. CONSTITUTION:When a copy is taken by an electrophotographic copying machine, the information image formation surface of the document for copying prevention is exposed through the mesh body which has the double spread of specific size, and light which is projected on the surface is transmitted through the double spread of the mesh body without being diffracted by the grating of the mesh body. The specular surface of the no-image area other than the information image is reduced in specular property by the mesh body and part of the projection light is reflected irregularly to reach a photosensitive body. Consequently, the photosensitive body is exposed to the reflected light from the no-image area other than the information image area and an electrostatic latent image is formed on the photosensitive body. Here, the double spread of the mesh body is of about 100-400mum. Consequently, the copy image is formed by an electrophotographic process.
Bibliography:Application Number: JP19870297986