| 摘要 |
This invention is a device that enables a baseball pitcher to accurately measure both the location and speed of a baseball. The device consists of a frame with embedded laser diodes and corresponding photo detectors in both the horizontal and vertical directions. Certain photo detectors correspond to a typical strike zone which may be varied. When a baseball is thrown through the frame, the baseball breaks the path of at least one of the light beams from the laser diodes in the vertical and sometimes the horizontal direction. The resulting interruption of the path of light generates a signal that indicates not only whether a ball or a strike has been thrown, but the speed of the pitch is calculated as well.
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