| 摘要 |
PURPOSE:To achieve an optical recorder with easy adjustment and giving a prescribed recording pattern, by providing an optical attenuation means controlling the intensity of diffraction light with slits, at the back of a slit plate located in an optical path of a laser beam intensity-modulated with a major information signal. CONSTITUTION:A light from a laser source is split at a half mirror 9, and one light is modulated with a mahor information signal 11 at an optical modulator 10 to form a spot 21 on an original disc D with a recording lens 20 through a slit S1 and a member VSL with optical attenuator. Another light is modulated with a tracking information signal 23 at an optical modulator 22 to form a spot 34 through a slit S2 and a lens 20. In adjusting two laser beams, a light through a part A of the member VSL is used and the reflected light of spots 21 and 24 is monitored at a monitor PM. In recording, since a light rejecting a high order diffraction light is used through a part B of the member VSL, a prescribed recording pattern can be obtained with easy adjustment. |
