Patent ID: 6157478
Filing Date: 2000-12-05
Classification: B41J,G02B

Abstract:
A scanning optical apparatus comprising:a first light source for irradiating a first luminous flux;a second light source for irradiating a second luminous flux;a beam splitter for transmitting said first luminous flux and reflecting said second luminous flux so that the first and second luminous fluxes exit from the beam splitter substantially in a same direction;a condenser lens for shaping said first and second luminous fluxes having exited from said beam splitter;a deflector for deflecting said first and second luminous fluxes having exited from said condenser lens; anda scanning optical system for imaging said first and second luminous fluxes on a scanned surface,wherein said scanning optical apparatus fulfills the following condition:d.multidot..beta..multidot.Pi<40000where:d is an optical path length (unit: mm) of said second luminous flux from an irradiation point of the second light source to a reflection point of the beam splitter;.beta. is an overall magnification of the optical system from the irradiation point of the second light source to the scanned surface; andPi is a density (unit: dot/inch) of a luminous flux imaged on the scanned surface.