| 摘要 |
PROBLEM TO BE SOLVED: To rationally constitute a light source capable of logically removing IR rays included in rays of a light emitting means. SOLUTION: An IR cut filter, which is high in transmittance in a region [A] of visible rays and is low in the transmittance of a first region [B1] of a short wavelength and is higher in the transmittance as the wavelength is longer in a second region [B2] of a long wavelength in a region [B] of IR regions, is disposed in a route where the rays from a halogen lamp are guided.
|
