摘要 |
PURPOSE:To record recording information to a high density by applying modulation to the inclination quantity in the arranging direction of the recording marks constituted of plural equally spaced marks by the many valued information subjected to many valuing, thereby recording the many valued information. CONSTITUTION:The laser beam diffracted by a diffraction grating 2 is made incident on a collimator lens (hereafter expressed as COL) 3. The laser beam past this COL 3 is collimated to collimated beams of light which are made incident on an objective lens 4 and form three beam spots condensed to the surface of an optical recording medium 5. The three beam spots are used as the light beams for recording, by which the plural equally spaced marks are formed and the recording marks are formed. The execution of the many value recording by applying modulation to inclination quantity of the arranging direction of the recording marks by the many valued information having the many valued levels and forming the recording marks is attained by rotating the diffraction grating 2 around the optical axis as the axis of rotation. |