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公开(公告)号：US4987445A
公开(公告)日：1991-01-22
申请号：US421182
申请日：1989-10-13
摘要： A scanning light contact duplicating apparatus is described which includes an explosure frame having a front and rear edge between which extends a backing plate that is used for supporting an original sheet such as a negative transparency to be copied, together with a photosensitive sheet in contact with it. A transparent cover is connected to the exposure frame. Provision is also made for pressing the transparent cover toward the backing to force the original sheet (negative) into close contact with the copy sheet (photosensitive sheet). An elongated light, usually a gas or vapor lamp, is positioned parallel to the front edge of the exposure frame. The light is supported for rectilinear movement toward the rear of the exposure frame and parallel to the plane of the exposure frame. A collimator is preferably provided between the light and the exposure frame. The collimator has a honeycomb array of parallel open-ended cells, each of the cells having walls perpendicular to the exposure frame. The collimator is supported for movement with the light whereby the alignment of the light rays that pass light through the cells of the collimator reduces undercuting on the photosensitive sheet. In some forms of the invention the exposure frame is stationary and in other forms two exposure frames are mounted back-to-back and supported for 180.degree. of rotation so that material can be inserted into one exposure frame while graphic material is simultaneously exposed to the scanning light while in the adjacent exposure frame.
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公开(公告)号：US4676633A
公开(公告)日：1987-06-30
申请号：US871313
申请日：1986-06-06
IPC分类号： G03B27/20
CPC分类号： G03B27/20
摘要： The present invention provides an improved vacuum frame having upper and lower frame members of rectangular shape, the upper one of which supports a plate of glass. Connected to the lower frame is a flexible sheet such as a rubber sheet with a backing member connected to its lower surfae. Resilient members such as springs urge one edge of the sealing sheet upwardly toward the glass plate and the other edge downwardly away from the glass plate to produce a wedge shaped vacuum chamber which upon being evacuated becomes progressively smaller as air is progressively and directionally removed proceeding from one edge of the glass plate to the other.
摘要翻译： 本发明提供一种改进的真空框架，其具有矩形形状的上框架构件和下框架构件，其上部支撑玻璃板。 连接到下框架是柔性片材，例如具有连接到其下表面的背衬构件的橡胶片材。 诸如弹簧之类的弹性构件将密封片的一个边缘朝向玻璃板向上推动，而另一个边缘向下远离玻璃板，以产生一个楔形真空室，当真空被逐渐地和逐向地从空气逐渐取出时，它们逐渐变小， 玻璃板的一个边缘到另一边。
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