| 摘要 |
<p>PURPOSE:To save energy and to suppress occurrence of color speck by correcting a spectral transmittivity characteristic of a green filter so that a sum of a difference of wavelengths of a low pass side causing 50% transmittivity and a difference of width of wavelengths causing 50% transmittivity is equal to and less than 7nm. CONSTITUTION:A color separation filter 14 is provided with a green filter 15 comprising an interference filter. When a light incident angle into the green filter 15 changes for a prescribed angle range in response to a picture angle of an original, the spectral transmittivity characteristic of the green filter 15 is corrected so that a difference of wavelengths of a low pass side causing 50% transmittivity with respect to each incident angle within an angle range is equal to and less than 6nm, a difference of wavelengths of a high pass side causing 50% transmittivity with respect to each incident angle within an angle range is equal to and less than 6nm, and a sum of a difference of wavelengths of a low pass side causing 50% transmittivity and a difference of width of wavelengths causing 50% transmittivity is equal to and less than 7nm. Thus, production of color speck is suppressed while saving energy.</p> |
