| 摘要 |
PROBLEM TO BE SOLVED: To provide a display device illuminating only a part of a target, against which a ball hits, with a laser beam, not being influenced by the impact of the ball, and thereby improving the durability of a ball sensor. SOLUTION: The display device 20 includes laser emitters 21 installed on the side of a target 50 to emit a laser beam by receiving signals from the ball sensors 10 for sensing hitting of the ball, a support 22 for fixedly supporting the plurality of laser emitters 21, and a driving device 23 for periodically moving the whole of the support 22 in a closed curve. COPYRIGHT: (C)2008,JPO&INPIT
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