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公开(公告)号：US3724942A
公开(公告)日：1973-04-03
申请号：US3724942D
申请日：1972-04-12
Applicant: IBM
IPC: G03B27/54 , G03B27/50 , G03B27/72 , G03G15/04 , G03G15/043 , G03G15/047 , G03G15/00
CPC classification number: G03G15/047 , G03G2215/0436 , G03G2215/0463
Abstract: A shutter arrangement is disclosed which at pre-selected intervals opens and closes to either permit light to illuminate a document plane or reflect light to the photoconductor of an electrostatic copying machine having the capability of half tone development, thus preventing the toning of unexposed areas of the photoconductor which bear no relation to the document being copied. The control arrangement opens the shutter during the normal scanning portion when a document is exposed to the illumination light and closes the shutter at a point corresponding approximately to the end of the document scan thus reflecting light to the photoconductor as if the photoconductor was receiving light from a white document, to discharge the unused portion of the photoconductor. This prevents excessive toning and the associated cleaning problems since this portion of the photoconductor will not have the toner transferred from it to a copy sheet.
Abstract translation: 公开了一种快门装置，其在预选间隔打开和关闭以允许光照射原稿平面或将光反射到具有半色调发展能力的静电复印机的感光体，从而防止调色 与正在复印的文件无关的光电导体。 当文件暴露于照明光时，控制装置在正常扫描部分期间打开快门，并且在大致对应于文档扫描结束的点处关闭快门，从而将光反射到光电导体，就好像光电导体正在接收来自 一个白色文件，以排出光电导体的未使用部分。 这防止了过度的调色和相关的清洁问题，因为光电导体的该部分将不会将调色剂从其转印到复印纸上。
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公开(公告)号：BR7705808A
公开(公告)日：1978-06-27
申请号：BR7705808
申请日：1977-08-31
Applicant: IBM
IPC: G03B27/34 , G03B27/50 , G03G15/04 , G03G15/041 , G03G21/00
Abstract: A continuously variable reduction optical system for document copiers including various embodiments. A scanning optical system embodiment is disclosed for corner referenced documents. Full-exposure optical system embodiments are disclosed for both single-edge referenced and corner referenced documents. The systems can make use of single focus lens or variable focus lens. Specific mechanisms are disclosed for continuously variable adjustments to magnification, to total conjugate length, to image position, to scan speed and scan length and to leading edge registration. All adjustments are tied together under the control of the machine operator.
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公开(公告)号：BR7705809A
公开(公告)日：1978-06-27
申请号：BR7705809
申请日：1977-08-31
Applicant: IBM
Abstract: A continuously variable reduction scanning optical system wherein a preferred embodiment is disclosed with mechanisms for continuously adjusting the magnification ratio, the total conjugate length, scan speed, scan length, and leading edge registration. Either a single focus or variable focus lens can be used.
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