| 摘要 |
<p>PURPOSE: To obtain a current colleecting element sensor which has a wide light collecting area adjusting range. CONSTITUTION: A current colleecting element sensor is provided with a hot-wire type pyroelectric element 1, a Fresnel lens-like light condensing cover 2 which condenses light to the element 1, an area adjusting means 3 which is provided with an adjusting section 5 composed of a plurality of shielding plates 4 which are arranged in parallel in a state where the plates 4 are overlapped upon another in a ring-like state with a light condensing area inside between the element 1 and cover 2 and continuously changes the light condensing area, and a sensor main body which houses the element 1 and means 3 and to which the cover 2 is fitted so as to cover the element 1.</p> |
