| 摘要 |
PURPOSE:To secure the proper operation of a magnetic sensor for a long time by preventing foreign objects generated in a housing from being attached to a magnetic sensor. CONSTITUTION:Pulses are generated for hole ICs 40 and 42 due to the rotation of the armature (magnet 38) of a drive motor. When the element of hole ICs 40 and 42 is exposed in a housing 34, foreign objects such as conductive brush powder and scattered solder are a attached between leads, causing malfunction or failure. Its prevention reduces durable period. The hole ICs 40 and 42 are fitted to the inside of the housing 34 and the elements of the hole ICs 40 and 42 are shielded from the inside of the housing 34 by the wall of a case 44 incorporating the hole ICs 40 and 42 and that of the housing 34. thus preventing the exposure into the housing 34 and such problems from occurring. |
