| 摘要 |
<p>PURPOSE:To improve the deciding ability of retrieval and extraction arranging a light source in a card rack to the overall width of a retrieval range and embedding an optical fiber in the holder, etc., where the optical fiber is visible from outside the card rack and the light of the light source can be photodetected. CONSTITUTION:The light source 4 is arranged at the front end part of the card rack 2 to the overall width of the retrieval range. The light source 41 consists of a plane optical fiber 41 made of resin which receives the light at a photodetection surface part 41A and passes it to an end part 41B and an illumination lamp 42. When the desired card holder 3A, etc., is retrieved and extracted and then moved forward, the photodetection part 52 of the optical fiber 5 comes close to the illumination end part 41B of the plane optical fiber 41 of the light source 4 to photodetect the light from the illumination end part 41B. Other card holders 3B, etc., have their photodetection parts at distances from the light source 4, so the light of the light source 4 is not photodetected. Consequently, the visibility and deciding ability are extremely high and the desired card holder, etc., can easily be found.</p> |
