Patent ID: 8089671

Claim:
An optical scanning device comprising: an optical flux generator which is configured to generate an optical flux in response to an image signal read for every dot clock and to radiate the optical flux; a resonance-type deflection element which has a deflection surface for scanning the optical flux; a drive signal generator which is configured to generate a drive signal for oscillating the resonance-type deflection element in a resonance state; and a dot clock generator which is configured to generate dot clocks by dividing master clocks which constitute basic clocks with a frequency dividing number corresponding to a scanning position, wherein the dot clock generator is configured to, with respect to a group of dot clocks which is formed of plural sets of dot clocks in which a frequency-dividing-number sequence pattern of the set of dot clocks each of which is constituted of two or more continuous dot clocks is repeated plural times on one scanning line, change the frequency-dividing-number sequence pattern of said each set of dot clocks while maintaining a total value of frequency dividing numbers necessary for generating said each set of dot clocks at a constant value.