| 摘要 |
PURPOSE:To converge composite luminous flux on one point and to reduce the size of a device by arranging a 1st light source which emits light in a 1st wavelength range and a 2nd light source which emits light in a 2nd wavelength range at positions symmetrical about the surface of a half-mirror. CONSTITUTION:A deuterium discharge tube 10 and a halogen lamp 12 are arranged symmetrically about the surface of a quartz plate 20 as the half-mirror. Part of the emitted light of this discharge tube 10 is transmitted through the quartz plate 20 and part of the emitted light of the halogen lamp 12 is reflected by the quartz plate 20, thereby forming a common optical path 21 of them. A concave mirror 22 is arranged on this optical path 21 and the composite light of both emitted light beams from the discharge tube 10 and lamp 12 is converged on the position of the slit 16 of a spectroscope 14. This discharge tube 10 emits light principally in the ultraviolet range and the lamp 12 emits light in the visible range and near infrared range, so the composite luminous flux is in the range from the ultraviolet range to the entire near infrared range. Further, the composite luminous flux of the both is the same with the integral constitution of the discharge tube 10 and lamp 12 by using double electrodes.
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