| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a light guide device giving widespread directivity to a beam irradiating from a light emitting element toward a light receiving element, which is capable of irradiating a strong beam, surely receiving the beam from the light emitting element by the light receiving element, supporting the sensor sensitivity of the light receiving element, giving a margin to a positional dimension of the light passing prism of the light emitting element and the sensor of the light receiving element, and reducing a defective rate. SOLUTION: This device is provided with a light guide member light guiding the beam from the light emitting element 1 toward the light receiving element 2. The light guide member is constituted by the light passing prism 3 and the light irradiation surface 3a irradiating the beam toward the light receiving element 2 of the light passing prism 3 is formed to a hemispherical projected shape, and projecting/recessing parts for diffusion-irradiating the beam are formed on the light irradiation surface 3a.</p> |
