| 摘要 |
An optical scanning apparatus includes light sources, an aperture having, and coupling lenses. Numbers of the light sources and the coupling lenses are equal to each other and the apparatus satisfies an inequality 12.7 <(DXBETA0xm0xxdpi)/(2xNA) <38.1 and an equation beta0=(beta+-beta-)/(n-1), wherein D represents a width of the slit of the aperture, beta0represents a beam open angle, mo represents a total lateral magnification ratio, dpi represents a number of dots per inch, NA represents a numerical aperture, beta+ represents a positive open angle, beta- represents a negative open angle, and n represents the number. Further, an image forming apparatus using this optical scanning apparatus and an image forming method are provided.
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