| 摘要 |
<p>PURPOSE:To almost completely block the influence of interference of a radio wave by blocking the opening section of the sealed case of a light entering section with a conductive optical filter and sealing the peripheral margin section of the filter with a conductive member in a state where the member is electrically connected with the sealed case. CONSTITUTION:The light entering section 22 of a sealed case 5 is constituted in such a way that the opening section 8 of the case 5 is locked with a conductive optical filter 23 and the peripheral margin section of the filter 23 is sealed with a conductive material 24 in a state where the material 24 is electrically connected with the case 5. Accordingly, entire bodies of an infrared ray detector 2 and a circuit board 4 mounting the detector 2 provided in the case 5 can be sealed completely. Therefore, the influence of interference of the radio wave can be blocked completely.</p> |
