| 摘要 |
PURPOSE:To suppress a rise in temperature of a near infrared transmitting filter, by providing a light-radiation part in a luminaire with a cold mirror, which reflects visible rays and transmits near infrared rays, and arranging a near infrared transmitting filter outside it. CONSTITUTION:Multi-layer films of SiO2 and formed on a glass of a light- radiation port which is situated on a front plane of a reflection shade 2 housing a halogen lamp or the like 4, and a cold mirror 5, which reflects light or 700nm or less in wavelength and transmits that of 800nm or more, is arranged. Outside it, a near infrared transmitting filter 6 which transmits near infrared rays, and a protective glass 7 are arranged to compose a near infrared luminaire 1. And, visible rays emitted from a light source 4 are reflected by a cold mirror 5 to transmit only near infrared rays. Therefore, rays below a near infrared region, which are absorbed into a near infrared transmitting filter 6, are widely decreased to suppress a rise in temperature, capable of obtaining the near infra red luminaire having large output.
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