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2. 发明授权

US5568264A Exterior view inspecting apparatus for circuit board 失效
标题翻译：电路板外观检查装置
公开(公告)号：US5568264A
公开(公告)日：1996-10-22
申请号：US515624
申请日：1995-08-16
申请人： Shigeki Nakatsuka , Iwao Ichikawa , Manabu Morioka , Kenji Kato , Takayuki Fujita , Shigetoshi Negishi , Kazuhiro Shiga
发明人： Shigeki Nakatsuka , Iwao Ichikawa , Manabu Morioka , Kenji Kato , Takayuki Fujita , Shigetoshi Negishi , Kazuhiro Shiga
IPC分类号： B23P21/00 , G06T1/00 , H05K13/08 , G01B11/00
CPC分类号： H05K13/08
摘要： The exterior view inspecting apparatus for circuit board of the invention including a sensor unit for emitting a laser beam to an object to be inspected, and detecting the displacement of the object by focusing the reflected light on a photoelectric transducer by using a receiving lens; an optical path converter unit for refracting the optical path of the laser beam; a sensor head unit incorporating the sensor unit and optical path converter unit; a control unit for moving the sensor head unit along a specified scanning route; a correction unit for correcting the displacement data of the object to be inspected as detected by the sensor unit, and a judging unit for judging the existence and position of an electronic component on a circuit board from the corrected displacement data. The optical path converter unit includes a flat sheet glass inclined relative to the optical path of the laser beam, rotating about the axial center parallel to the optical path. By this optical path converter unit, the optical path of the laser beam is refracted so that the laser beam scans the circuit board drawing a small circular trace. As the trace draws a small circle, the trace detects the end portion of the electronic component on the circuit board multiple times. Consequently, the existence and position of the electronic component on the circuit board can be detected accurately.
摘要翻译：本发明的电路板外观检查装置包括：用于向待检查物体发射激光束的传感器单元，以及通过使用接收透镜将反射光聚焦在光电变换器上来检测物体的位移; 用于折射激光束的光路的光路转换器单元; 包括传感器单元和光路转换器单元的传感器头单元; 控制单元，用于沿着指定的扫描路线移动所述传感器头单元; 校正单元，用于校正由传感器单元检测到的待检查对象的位移数据;以及判断单元，用于根据校正的位移数据判断电路板上的电子部件的存在和位置。光路转换器单元包括相对于激光束的光路倾斜的平板玻璃，围绕平行于光路的轴向中心旋转。通过该光路转换器单元，激光束的光路被折射，使得激光束扫描电路板，绘制小的圆形迹线。轨迹绘制小圆时，轨迹会多次检测电路板上电子元件的端部。因此，可以精确地检测电子部件在电路板上的存在和位置。

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