| 摘要 |
PROBLEM TO BE SOLVED: To prevent a warp in a transparent game board. SOLUTION: The game board 1 has a laminated structure with a transparent acrylic resin first layer plate 2 and a transparent acrylic resin second layer plate 3 joined to each other via a transparent pressure-sensitive adhesive 4. The pressure-sensitive adhesive 4 is a softer material than an adhesive, and therefore, the positional relation between the first layer plate 2 and the second layer plate 3 is not completely fixed as when the plates are pasted to each other with the adhesive. When the temperature in the first layer plate 2 is different from the temperature in the second layer plate 3 and the quantities of thermal expansion in the plates are different, the layer of the pressure-sensitive adhesive 4 absorbs the linear expansion of the first and second layer plates 2 and 3, so that a warp in the game board 1 can be prevented. COPYRIGHT: (C)2009,JPO&INPIT
|
