Patent ID: 7794076

Claim:
An ultraviolet ray irradiation device comprising an ultraviolet light source that irradiates ultraviolet rays onto a plurality of ultraviolet curable ink ejected on a recording medium by a record head, and a dividing mechanism comprising two filters, a first filter that passes the ultraviolet light rays of a first group of ultraviolet rays of shorter wavelengths, and a second filter that passes a second group of ultraviolet rays of longer wavelengths, wherein the ultraviolet ray irradiation device comprises a plurality of ultraviolet light sources, wherein an ultraviolet ray of the ultraviolet light source that irradiates the ultraviolet ray onto the recording medium in the vicinity of the record head is an ultraviolet light ray of the first group with a wavelength shorter than an ultraviolet ray of the second group from the ultraviolet light source that irradiates the ultraviolet ray onto the recording medium apart from the vicinity of the record head.