| 摘要 |
<p>PURPOSE: To obtain a small-sized high sensitivity pyroelectric infrared sensor employing a stuck piezoelectric element in the chopper. CONSTITUTION: A bimorphic element comprising a shim 11 and piezoelectrics 12a, 12b has a bending end which is displaced upon application of a voltage. Consequently, a displacement amplifying mechanism 13 is pushed in the vicinity of a notch thereof thus displacing the bending part of the mechanism 13. When the forward end of the bimorphic element is displaced reciprocally, the bending part of the mechanism 13 makes a reciprocal motion to intercept the infrared rays 18 entering into the sensor part 16 thus functioning as a chopper.</p> |
