| 摘要 |
PROBLEM TO BE SOLVED: To prolong the life of an embedded type display unit with preventing damage of a window member by embedding a protecting member having opened one face to a road surface, etc., installing a light emitter, etc., inside the protecting member and covering the opened part with a specific window member. SOLUTION: This embedded type display unit is composed of a protecting member 3 having opened one face and embedded in a floor, a wall or a ceiling, etc., and provided with a light emitter 5 or an indicator 4, etc., inside the protecting member 3 and an opening part of the protecting member 3 is covered with a window member 2 constituted with a translucent yttrium aluminum garnet sintered compact (YAG sintered compact). A translucent YAG sintered compact has high hardness and excellent wear resistance, and is hardly wounded, and preferably contains >=10% crystal having >=15μm particle diameter and has >=70% linear transmittance of visible light per 1mm thickness. Furthermore, the translucent YAG sintered compact is preferably constituted by 99.7-99.99wt.% of YAG as a main component with 0.01-0.1wt.% of at least one kind of metal such as Fe, W, Mo, Pd and Ag.
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