| 摘要 |
PROBLEM TO BE SOLVED: To simply determine the molding quality of a unit case for an electronic unit of an electronic water meter by performing visual inspection after its injection molding. SOLUTION: This unit case 31 for the electronic unit 3 of the electronic water meter 1 has a structure made by joining a case body 5 which is an injection molded article of resin to a case lid 6 in an air-tight state. A long and narrow triangular protrusion 10 for molding quality determination is integrally molded on an outside surface 62a of the case lid 6, with the protrusion 10 having a length corresponding to the flowability of molten resin material in its injection molding, and a part of the case lid 6 neighboring the protrusion 10 has scales 11(1) to 11(4). The case body 5 also has a similar projection and scales. Whether or not the case lid 6 is a defective molding can be simply determined by visually inspecting the protrusion 10 on the injection-molded case lid 6 just after mold releasing to check its relative length. Similar determination is possible also on the case body 5. COPYRIGHT: (C)2008,JPO&INPIT
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