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    • 3. 发明授权
    • Process for magnetic image character recognition
    • 磁图像字符识别过程
    • US4517268A
    • 1985-05-14
    • US531520
    • 1983-09-12
    • Robert J. GruberJohn F. KnappSteven B. Bolte
    • Robert J. GruberJohn F. KnappSteven B. Bolte
    • G03G19/00G03G9/08G03G9/083G03G9/087G03G9/113G06K15/14H01F41/16
    • H01F41/16G03G9/08G03G9/083G03G9/0833G03G9/08711
    • Disclosed is an improved, simple, economical process for generating documents, such as personal checks, suitable for magnetic image character recognition, which process comprises generating such documents with conventional xerographic methods in a high speed electronic laser printing device, and wherein there is selected as the developer composition a magnetic toner containing from about 20 percent by weight to about 70 percent by weight of magnetite particles, and from about 30 percent by weight to about 80 percent by weight of toner resin particles of styrene copolymers, such as a styrene butadiene copolymer, a styrene n-butylmethacrylate copolymer, or polyesters, and wherein the carrier particles are comprised of ferrite cores, coated with various polymeric resinous compositions. There can also be included in the developer composition various additives such as collodial silica particles, and charge enhancing additives, and further conductive carbon black or insulating carbon black particles can be incorporated into the carrier polymeric resinous coating.
    • 公开了一种改进的,简单的,经济的用于生成适合于磁图像字符识别的诸如个人检查的文档的过程,该方法包括在高速电子激光打印装置中用常规静电印刷方法生成这样的文档,并且其中选择为 显影剂组合物含有约20重量%至约70重量%的磁铁矿颗粒的磁性调色剂和约30重量%至约80重量%的苯乙烯共聚物如苯乙烯丁二烯共聚物的调色剂树脂颗粒 ,苯乙烯正丁基甲基丙烯酸酯共聚物或聚酯,并且其中载体颗粒由铁氧体磁芯组成,涂覆有各种聚合物树脂组合物。 还可以在显影剂组合物中包括诸如胶体二氧化硅颗粒和电荷增强添加剂的各种添加剂,并且可以在载体聚合物树脂涂料中引入另外的导电炭黑或绝缘炭黑颗粒。