| 摘要 |
PURPOSE:To miniaturize a sensor, by arranging a mirror piece in a case so as to reflect incident infrared rays to allow the same to be incident on a pyroelectric type infrared ray detection element. CONSTITUTION:A mirror piece 8 is provided in a case 2 having an opening part 10 covered with a member pervious to infrared rays to be arranged so that the infrared rays reflected from the first reflecting surface 8a are incident to the first pyroelectric type infrared ray detection element 6a and the infrared rays reflected from the second reflecting surface 8b are incident on the second pyroelectric type infrared ray detection element 6b. As mentioned above, by receiving the mirror piece 8 in the case 2, external processing becomes unnecessary and miniaturization can be achieved. |
