公开(公告)号：US06329888B1

公开(公告)日：2001-12-11

申请号：US09381424

申请日：1999-09-20

申请人： Kazuhiro Hirota

发明人： Kazuhiro Hirota

IPC分类号： H03H964

CPC分类号： H03H9/6436 ,  H03H9/145 ,  H03H9/14526

摘要： A surface acoustic wave transducer is provided having three electrode fingers disposed as one reference segment (&lgr;) on a piezoelectric substrate, each segment including an electrode finger 1 having a width W1, an electrode finger 2 having a width W2 with a gap of g1, and an electrode 3 having a width 3 with a gap g2. The electrode fingers 1 and 3 are set in-phase, and the electrode finger 2 is set in an opposite phase for driving. Further, W1 is set equal to W3, and g1 is set equal to g2. Thus, it is possible to provide a SAW transducer that has improved a shape factor at a high-pass side near a pass band of a primary-third order longitudinally coupled double mode SAW filter.

摘要翻译： 提供一种表面声波传感器，其具有在压电基板上设置为一个参考段（lambd）的三个电极指，每个段包括具有宽度W1的电极指1，具有间隙g1的宽度W2的电极指2， 和具有间隙g2的宽度3的电极3。 电极指1和3同时设置，并且电极指2被设置为相反的驱动相位。 此外，将W1设置为等于W3，并且将g1设置为等于g2。 因此，可以提供一种在一次三次纵向耦合双模式SAW滤波器的通带附近的高通侧改善形状因子的SAW换能器。

公开(公告)号：US6145834A

公开(公告)日：2000-11-14

申请号：US95271

申请日：1998-06-10

申请人： Kazuhiro Hirota ,  Hiroshi Nakagomi ,  Yasuhito Watanabe ,  Hiroshi Maeshima ,  Kazunori Yoshioka

发明人： Kazuhiro Hirota ,  Hiroshi Nakagomi ,  Yasuhito Watanabe ,  Hiroshi Maeshima ,  Kazunori Yoshioka

IPC分类号： G03G15/00 ,  H04N1/00 ,  H04N1/12 ,  B65H5/00

CPC分类号： G03G15/60 ,  H04N1/0057 ,  H04N1/00588 ,  H04N1/00602 ,  H04N1/00612 ,  H04N1/00631 ,  H04N1/00681 ,  H04N1/00713 ,  H04N1/00734 ,  H04N1/00745 ,  G03G2215/00194 ,  G03G2215/00215 ,  H04N1/1215

摘要： In an automatic document feeder for use in an image forming device such as copy machine and facsimile machine: a document shunting path for temporarily shunting a document is provided at an upstream side of a document reading portion; in a different-size mixed mode where different sizes of documents are placed in a mixed manner, the leading edge and rear edge of the document are detected by a sensor during conveyance of the document in the direction toward the document reading portion, so that the length of the document is detected; thereafter the document is conveyed in the reverse direction so that the rear edge of the document is shunted into the document shunting path; and thereafter the document is again conveyed in the forward direction to conduct reading. Thus, it becomes unnecessary to provide a longer conveyance path for detecting the length of the documents, so that the size of the feeder itself can be reduced.