| 摘要 |
PROBLEM TO BE SOLVED: To allow automatic alignment of a front plate to a case by providing a tapered guide part which contacts a tapered part of the front plate while adjointing a front opening part of the case. SOLUTION: A contact panel 3 of a front plate 1 comprises an oblong base part 3a and a tapered part 3b wherein the end part in the longitudinal direction of the base part 3a is bent by anglesθ1 andθ2. The anglesθ1 andθ2 of the tapered part 3b allow an electronic circuit board to be inserted smoothly in a case 7. The case 7 is provided with a front opening part 7c as well as tapered guide parts 7b which are square notches at constant intervals in the vertical direction of the front opening part 7c. Thread parts 7a of the same number as the tapered guide parts 7b are opened.
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