| 摘要 |
<p>PURPOSE:To find a spectrum defective due to shielding, and to detect a coordinate position corresponding to the spectrum, by condensing and synthesizing a received spectrum, and distributing it to plural filters with different spectrum band areas. CONSTITUTION:When a circle point 20 on a coordinate plane is indicated by a pointing stick, etc., the spectra of black areas 24a and 24b are formed as shown in figure on condenser lenses 9a and 9b. In figure, the fact that no part of the black area 24a is made incident on, means that a wavelength 25 can be calculated from a ratio between the reduction of the light quantity of a filter 17, and the reduction of the light quantity of a filter 16 at the black area 24a, from the fact that the light quantity after passing the filter equals to the area of a passing band area, and a wavelength 26 can be calculated from the ratio between the reduction of the light quantities of a filter 15, and the filter 16, from the black area 24b. And it is possible to obtain coordinates (x) and (Y) respectively corresponding to the spectra defective due to the shielding from these wavelengths 25 and 26.</p> |
