Patent ID: 6839157

Claim:
An optical scanning apparatus, comprising: a plurality of light sources; an aperture having at least one slit; and a plurality of coupling lenses, wherein numbers of the plurality of light sources and the plurality of coupling lenses are equal to each other and said apparatus satisfies an inequality 12.7<( D×β 0 ×m 0 ×dpi)/(2 ×NA )<38.1 and an equation β 0 =(β + −β 31 )/( n −1), wherein D represents a width of said at least one slit of the aperture, β 0 represents a beam open angle, m 0 represents a total lateral magnification ratio, dpi represents a number of dots per inch, NA represents a numerical aperture, β + represents a positive open angle, β − represents a negative open angle, and n represents said numbers.