| 摘要 |
PURPOSE:To obtain recording having a contrast sufficient to read by the naked eye using low output laser beam by specifying the reflectivity at the main wavelength of recording laser beam on the surface of an optical recording material wherein a thermal color forming layer and a beam absorbing layer containing a near infrared absorbent are laminated to a base material. CONSTITUTION:A thermal color forming layer containing a basic dye and an org. coupler and a beam absorbing layer containing a near infrared absorbent are laminated to a base material to form a recording material performing recording by laser beam having a main wavelength in the vicinity of a near infrared region and the reflectivity at the main wavelength of laser beam on the surface of the recording material is adjusted so as to become 15-80%. There is no special limit in the order of lamination and the order of base material/thermal color forming layer/beam absorbing layer and the order of base material/beam absorbing layer/thermal color forming layer may be employed. A protective layer for reducing the effect from the outside may be provided on the uppermost layer and, especially, it is pref. that the thermal color forming layer is the uppermost layer. When a hydrophilic material is used as the base material, as the near infrared absorbent, a water-soluble near infrared absorbent or a finely divided dispersible near infrared absorbent is pref. used and, especially, the use of the water-soluble near infrared absorbent is preferable. |
