Patent ID: 6580484
Filing Date: 2003-06-17
Classification: G02B,G02F

Abstract:
A laminated phase plate formed by laminating a first optical phase difference compensation plate and a second optical phase difference compensation plate,said first optical phase difference compensation plate having a retardation between 100 nm and 180 nm for transmitted light in a direction normal to said first optical phase difference compensation plate, so as to provide a phase difference of Â¼ wavelength for light of a principal visible wavelength range between 400-700 nm, said second optical phase difference compensation plate having a retardation between 200 nm and 360 nm for transmitted light in a direction normal to said second optical phase difference compensation plate, so as to provide a phase difference of Â½ wavelength for light of a principal visible wavelength range between 400-700 nm, wherein when linearly polarized light having different wavelengths in a visible light range and having a fixed plane of vibration is incident on said second optical phase difference compensation plate and emerges from said first optical phase difference compensation plate, said linearly polarized light becomes linearly polarized light having different vibration plane directions for the different wavelengths.