| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure of a casing capable of preventing a user from receiving large stress from an edge or a sharp edge, of preventing manufacture of a die for the casing from being complicated, and of preventing the casing from being slidingly dropped in lifting the casing or the like even if the width of a surface for the user to put his or her hand thereon is not sufficiently wide by forming a step, in a structure of a casing composed by forming a step by two surfaces and forming an edge or a sharp edge on the step. SOLUTION: Ribs 12 having a height nearly equal to that of a bottom surface 11 is formed along the bottom surface 11 being a surface located at a higher position; and the width of each groove part 15 formed between the bottom surface 11 and the rib 12 is narrowly formed so that, when pressing force is applied to the bottom surface 11 and the rib 12 from fingers of a hand, and stress acts against the pressing force, the stress acts on the bottom surface 11 and the rib 12 in the vertical direction. COPYRIGHT: (C)2009,JPO&INPIT
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