| 摘要 |
PURPOSE:To make an establishing work of a detecting range easy by providing a mechanism for changing a light emitting member of a lighting position close to an infrared-ray detecting element and to the position outside a visual field of a condenser mirror and by using the engaging member and an element staring case to serve as a contact of a lighting switch. CONSTITUTION:When a mobile frame 24 is operated for rotation by an operating lever 27 and a light emitting member 18 is held at a lighting position by engaging an engaging member 31 with an element storing case 20, the luminous member 18 is enlarged and projected to the condition of nearly focusing to a condenser mirror 2 and coincides with the detecting range of an infrared-ray detecting element 3. The inclination of light axis of the mirror 2 is also adjusted with visualizing the light emitting member projected. Then with lighting-off by reverse operation of the lever 27 and by removal of the engaging member 31 from the peripheral face of the case 20, the mobile frame 24 is rotated and displaced with a tensile spring 29 and the light emitting member 18 is returned to a lighting off position and a work for establishment of visual range of the mirror 2 is completed. Further a mask cover (figure omitted) is covered on a main body 1 of detector after the completion. |
