公开(公告)号：US5973797A

公开(公告)日：1999-10-26

申请号：US779737

申请日：1997-01-07

申请人： Katsunari Tanaka ,  Tomoyuki Yamada ,  Daisuke Kono ,  Hiroshi Hayashi ,  Kazuhiko Minowa ,  Ken Kajikawa

发明人： Katsunari Tanaka ,  Tomoyuki Yamada ,  Daisuke Kono ,  Hiroshi Hayashi ,  Kazuhiko Minowa ,  Ken Kajikawa

IPC分类号： H04N1/04 ,  H04N1/00

CPC分类号： H04N1/00708 ,  H04N1/00681 ,  H04N1/00721 ,  H04N1/00737 ,  H04N1/00748 ,  H04N1/00753 ,  H04N1/00769 ,  H04N2201/0422

摘要： The present invention relates to an image reading apparatus in which a structure is simple and in which the size of a document can be detected in a short time, wherein the levels of signals, which are outputted from photoelectric elements within a plurality of sensing regions on a light-receiving portion of a line sensor correspond to a pair of nearby regions (#1 and #2, #3 and #4, #5 and #6, and #7 and #8) which hold each edge (e.g., edges 64A, 64B, 64C in FIG. 5) of the plurality of documents of different sizes disposed on a platen glass, are compared to a threshold value, or alternatively, the change in the levels of signals which are outputted from the photoelectric elements within a plurality of sensing regions (e.g., #1, #2 and #3 in FIG. 11) continuously cross each edge of the plurality documents of different sizes is obtained in order to determine the size of the document. An optical sensor which detects the existence of the document at a predetermined position (#0) on the platen glass is provided so that when the document is disposed in a transverse direction (SEF), the documents exists, and when the document is disposed in a longitudinal direction (LEF), the document does not exist. Accordingly, the direction of the document is determined. Due to this structure, the size and direction of the document disposed on the transparent member are determined.

摘要翻译： 本发明涉及一种图像读取装置，其结构简单，并且可以在短时间内检测文档的尺寸，其中从多个感测区域内的光电元件输出的信号电平 线传感器的光接收部分对应于保持每个边缘的一对附近区域（＃1和＃2，＃3和＃4，＃5和＃6和＃7和＃8）（例如，边缘 将不同尺寸的多个文档的图示的图64中的64A，64B，64C）与阈值相比较，或者替代地，将从光电元件输出的信号的电平的变化与 获得多个感测区域（例如，图11中的＃1，＃2和＃3）连续地跨越不同大小的多个文档的每个边缘，以便确定文档的大小。 检测在稿台玻璃上的预定位置（＃0）处是否存在文件的光学传感器，使得当文档沿横向（SEF）设置时，存在文档，并且当文档被放置在 纵向（LEF），文件不存在。 因此，文件的方向被确定。 由于这种结构，确定了布置在透明构件上的文件的尺寸和方向。