| 摘要 |
PURPOSE:To prepare the title optical card in a simple process by constituting the card so that recording/reproducing may be executed with the separate optical system of a recording light source wavelength while a recording line is being tracked with a control system scanning with the use of a recording light source and at an output which does not generate the change of a colored condition. CONSTITUTION:A recording area 4 to optically record a signal in a condition having suction characteristics in the wavelength area of the recording light source out of the two reversible colored condition of a photochromic material 2 is formed by the irradiation of an ultraviolet wave DV with a photomask 3 beforehand by means of the photochromic material 2 on a transparent substrate 1. Further, the recording line is tracked by the optical control system to scan at the recording light source wavelength and at the output which does not generate the change of the colored condition, and the recording/reproducing is executed to a recording bit 5 in a tracing condition, and an upper part is covered with a protective layer 6. Thus, the recording/reproducing can be extremely easily executed. |
