| 摘要 |
PURPOSE:To simplify control of recording data and to enable effective use of the specular faces of a rotary polyhedral mirror by constituting an optical scanner in such a way that the recording time region of one optical scanning system does not overlap on the recording time region of the other optical system. CONSTITUTION:The reflecting points of the specular faces of the rotary polyhedral mirror 10 when the modulated light 15a, 15b from light sources 21a, 21b are reflected by said faces and when said light coincide with the optical axes of ftheta lenses 13a, 13b are designated as A and B and the center of rotation of the rotary polyhedral mirror is designated as O. The optical scanner is so constituted as to safisty the equation (in which thetar is the partial angle of the rotary polyhedral mirror, (n) is an optical integer, thetamax is the max. scanning angle, beta is the angle between the perpendicular from the center O of rotation to the specular face when the center of the modulated light reflected by the specular face coincides with the optical optical axis of the scanning lens system and the line connecting the center O of rotation and the reflecting point of the modulated light) when the above-mentioned reflecting points are made <AOB=<alpha. The scanning without overlapping and interruption is thus made possible by the simple control system using one set of buffer. |
