| 摘要 |
PURPOSE:To obtain an inexpensive optical information recording medium having a large reflection factor and also using a synthetic resin substrate, by providing the first spacer layer whose refractive index is larger than a refractive index of the substrate, and the second spacer layer consisting of an inorganic matter whose refractive index is smaller than a refractive index of the first spacer layer, on the substrate, and forming a recording layer on said layer by a solvent applying method. CONSTITUTION:The first spacer layer 30 and the second spacer layer 40 are provided on a synthetic resin substrate 10, and on said layer, an organic pigment recording layer 20 is formed by a solvent applying method. It is necessary that a refractive index of the first spacer layer 30 is larger than a refractive index of the substrate 10, and in order to obtain a substantial effect, it is desirable that its thickness is made thicker than lambda/8n [lambda and (n) denote a wavelength of a light beam, and a refractive index of a material of the spacer layer, respectively]. A material and thickness of the second spacer layer 40 are selected so that a reflected light 300 is made small, and it is necessary that a refractive index of the second spacer layer 40 is smaller than a reflective index of the first spacer layer 30, and in order to obtain a substantial effect, it is desirable that its thickness is made thicker than lambda/8n. Also, it is necessary that a material of the second spacer layer is an inorganic matter which cannot be dissolved by a solvent. |
