| 摘要 |
PROBLEM TO BE SOLVED: To attach a sensor holder easily and swiftly. SOLUTION: To attach a main unit 6 to a guide 5, when this main unit, of which a housing case 8 is originally fixed to a circuit board 7 at the factory, is pressed from the top surface of a guide 5, inclined planes 82b and 82b of locking claws 82a and 82a at the bottom edge of locking pieces 82 and 82 contact the edge of an opening 5a of this guide, and when it is further pressed, these locking pieces are deformed inward against their own elastic force, and they are automatically restored by their own elastic force at the moment when the locking claws 82a and 82a go through the opening 5a, locking the bottom of this opening.
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