| 摘要 |
PURPOSE:To easily obtain a grating height of a prescribed quantity, and to satisfactorily display a diffraction effect, by constituting the titled device so that a projecting part and a projecting part, and a recessed part and a recessed part of a diffraction grating part are opposed in parallel to each other and superposed. CONSTITUTION:The titled device is provided with two pieces of substrates 7, 7, a diffraction grating 2 which is placed between these substrates 7, a refractive index variable substance 1 which is packed between grating grooves of this diffraction grating, and a control means for controlling a refractive power of this refractive index variable substance 1. The diffraction grating 2 is constituted of plural diffraction grating parts 20, 21 which have opposed and superposed a projecting part and a projecting part, and a recessed part and a recessed part so that they conform in parallel to each other. In such a way, at the time of executing an optical modulation of a path of light and light-shielding, etc. by utilizing the refractive index variable substance such as a liquid crystal 1, etc. and the diffraction grating 2, height between the projecting and the recessed parts of the diffraction grating 2, and a grating height of about several mum can be secured easily, and also, the adhesion of a transparent electrode 6 and the transparent substrate 7, and the diffraction grating is held satisfactorily, and a drop of a contrast ratio caused by a polarization is prevented. |
