Patent ID: 7982906
Filing Date: 2011-07-19
Classification: G02B,G06K,H04N

Abstract:
1. An optical scanning device comprising: an optical flux generator which generates an optical flux in response to an image signal read for every dot clock and radiates the optical flux; a resonance-type deflection element which has a deflection surface for scanning the optical flux; and a drive signal generator which generates a drive signal for oscillating the resonance-type deflection element in a resonance state, wherein, the optical scanning device further includes a dot clock generator which generates dot clocks having clock cycles corresponding to the scanning directions of the optical flux by dividing master clocks which constitute basic clocks, the dot clock generator is configured to sequentially generate the dot clocks which satisfy a first condition that the clock cycle of the actually-used dot clock corresponding to the scanning direction of the optical flux exhibits an error equal to or less than 1 cycle of the master clock with respect to the clock cycle of the dot clock which constitutes a theoretical value such that optical fluxes corresponding to respective dots are arranged at equal intervals, a second condition that the cycle differences between the clock cycle of the actually-used dot clock corresponding to the scanning direction of the optical flux and the clock cycles of the preceding and succeeding dot clocks become errors equal to or less than 1 cycle of the master clock, and a third condition that an error between the number of the master clocks which is acquired by cumulatively adding the dot clocks from the dot clock corresponding to a scanning start position of the optical flux to the dot clock to be generated, and the number of the master clocks which constitutes a theoretical value and is acquired by cumulatively adding dot clocks which constitute the theoretical values corresponding to the dot clocks from the dot clock corresponding to the scanning start position of the optical flux to the dot clock to be generated becomes equal to or less than 1 cycle of the master clock, and the optical flux generator radiates the optical fluxes having brightnesses corresponding to the clock cycles of the dot clocks generated by the dot clock generator.