| 摘要 |
PURPOSE:To record an image which can be directly identified with the naked eye by recording an optical recording medium on which a light absorption layer and a heat sensitive coloring layer are laminated on a hydrophilic base material by using a laser light condensed via a specific condensing lens. CONSTITUTION:An optical recording medium on which a heat sensitive coloring layer containing basic dye and organic developer and a light absorption layer containing near infrared absorber are laminated on a hydrophilic base material is irradiated on its optical recording surface with a laser output from a laser light emitting element with a low output laser device by converting the laser into parallel beam via a lens system and then converging it via a condensing lens having 0.1 - 0.5 of number of apertures (N.A) and 0.5mm or more of focal length. When thus recorded, even if the recording surface has an uneven part or waviness which cannot be avoided when a hydrophilic base material is employed, the deviation of the focusing position of an irradiated light from the recording surface is not so increased. Accordingly, a recording density of a readable range and a contrast can be obtained. |
