| 摘要 |
<p>PURPOSE: To secure the directivity to the light emission surface of an infrared ray emission part by providing a light emission part with the infrared-ray emission part and a hemispherical reflection plate. CONSTITUTION: The hemispherical reflection plate 6 is fitted on the side of the light emission surface 5 of the infrared-ray emission part 5 which emits infrared rays 7 so that the convex part of the hemispherical reflection plate 6 faces the light emission surface 5 of the infrared-ray emission part 4. As for the light emission part of a cordless pen mouse of this constitution, infrared rays 7 emitted by the light emission surface 5 of the infrared-ray emission part 4 are reflected by the hemispherical reflection plate 6 and transmitted over the entire entire area except the direction to the hemispherical reflection plate 6 when viewed from the infrared-ray emission part 4. Consequently, the infrared rays 7 outputted from the infrared-ray emission part 4 can be transmitted to the entire spatial area and an infrared-ray reception part can receives them from the entire spatial area.</p> |
