| 摘要 |
PURPOSE:To provide an optical scanner capable of restraining variance on an individual light spot diameter and light quantity, capable of restraining the variance on an individual picture element which becomes the base of an image, and capable of obtaining a desirable image by simultaneously controlling the diameter of a light spot formed on a photoreceptor and the light quantity. CONSTITUTION:As to this scanner provided with a writing optical system in which a light source 1 having variable light emitting output, an aperture-stop 2 respectively and independently varied in a main scanning direction and in a subscanning direction, a beam shaping optical element 3, a deflector 4, and an ftheta optical element 5 are arranged in order, and forming the light spot on the image surface 6 of the photoreceptor, etc., by the writing optical system; the aperture-stop 2 and the light source 1 are controlled in a state where the diameter of the light spot formed by the writing optical system and the light quantity become a reference light spot diameter and reference light quantity by referring to the diameter of the light spot formed by the writing optical system and the light quantity, and the diameter of the reference light spot on the image surface and the reference light quantity recorded in a recording element 8. |
