| 摘要 |
PURPOSE:To prevent the camber by moisture absorption and to provide a sharp image to be reflected so as to decrease the degree of fatigue after viewing for a long period of time by providing a reflection layer which has a specific reflectivity and has specifically sized reflection, non-reflection and boundary parts. CONSTITUTION:A plastic mirror is such that the min. line width (a) of the non-reflection part satisfies the equation (1), the boundary width (b) satisfies the equation (2) and further DELTAR defined by the equation (3) satisfies the equation (4) in a 30-80% range of the reflectivity R. In the equations, R: the reflectivity (%) of the plastic mirror having the fine non-reflection part in the reflection layer, Ro: the reflectivity (%) of the plastic mirror which is the same as the plastic mirror except that said mirror is not provided with the non-reflection part in the reflection layer. The camber by moisture absorption is thereby prevented and the reflected image is sharp. The degree of fatigue after viewing for a long period of time is thus decreased.
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