Patent ID: 6473216
Filing Date: 2002-10-29
Classification: B41J,G02B

Abstract:
An optical scanner comprising:a laser diode which emits a laser beam of definite wavelength; first optical element which patterns the beam scanned from said laser diode to an almost parallel beam; a slit where a long hole has been formed in a main scan direction perpendicular to an optical axis, which slit is located in front of said first optical element; second optical element located in front of said slit, having refractivity in a direction perpendicular to an optical axis; an optical deflector where a reflection plane has been provided which reflects with designated angle the laser beam that has been emitted from said laser diode and has passed said first optical element, slit and second optical element; and third optical element whose main scan direction is a nonspherical shape and subscan direction is made a spherical surface which optical element spots to a scanned surface the laser beam reflected from said optical deflector, wherein said third optical element consists essentially of two optical surfaces and both surfaces are modified toric surfaces, among which the surface facing said optical deflector has convex shape.