| 摘要 |
PURPOSE:To prevent an optical component from deteriorating in optical performance due to the sticking of a vaporized adhesive on each constituent member by providing holes for gas-extraction to a sealed space. CONSTITUTION:A secondary image forming lens 12, a holding member 15, and a photodetection sensor 13 are fixed with the holding member 15 area with an adhesive. The holder 15 is provided with the holes H1 and H2 for gas- extraction and the space S surrounded with the holder 15, secondary image forming lens 12, and photodetection sensor 13 is not sealed because of the gas extraction holes H1 and H2 and the gas of the vaporized adhesive is discharged through the gas extraction holes H1 and H2 without sticking on the secondary image forming lens 12 nor photodetection sensor 13. Light emitted by a body is made incident on a photographic lens and passed through a visual field mask 7, an infrared-ray cutting filter 8, and a field lens 9 and pieces of luminous flux passed through four apertures 11a-11d of a stop 11 are made incident on secondary image forming lenses 12a-12d to form correct secondary images on line sensors 13a-13d on the photodetection sensor 13. |
