| 摘要 |
PURPOSE:To facilitate controlling an optical wedge by setting transmission factors for wavelength 550nm and wavelength 630nm to allowable values. CONSTITUTION:Resin materials for ND filter consisting of three primary colors, yellow, blue, and red where transmission factors for wavelength 550nm, wavelength 630nm, are 2.8-3% and 0.675-0.825% respectively in respect to spectral characteristics for 2mm. thickness are selected and are molded to form an optical wedge. Through transmission factors for wavelength 450nm, wavelength 550nm, wavelength 630nm, and wavelength 720nm are 1.15%, 2.9%, 0.75%, and 2.4% respectively in respect to experimental ideal spectral characteristics of resin materials for ND filter, it is difficult to control (inspect) transmission factors for four waelengths. In this invention, transmission factors for two wavelengths are controlled on a basis of the relation to peak points of the sensitivity of a photodetector to obtain spectral characteristics approximating ideal those as a whole. |
