A light source device includes a housing having a great length along a predetermined direction, a plurality of light emitting elements which are placed in the housing and are arranged along the predetermined direction, and one or more heat dissipation members which are placed in the housing and are thermally connected with the light emitting elements. A first intake port through which air is sucked into the housing is provided in one end in the housing. An exhaust port through which air is discharged to an outside is provided in the other end in the housing. A space where the other side in the predetermined direction faces the heat dissipation member is formed in the housing. A second intake port through which air is sucked into the space from the outside is provided in a side surface between the first intake port and the exhaust port in the housing.

Systems and methods for achieving increased irradiation and/or illumination in a photo reactive system is disclosed. In one example, a photo reactive system includes a light source, a refractive cylindrical optic, and a curved reflector. By utilizing the refractive cylindrical optic, angular spread of the light source is reduced, which in turn reduces a size of the curved reflector for directing the light rays onto a work piece. Consequently, a more compact photo reactive system with higher irradiation and/or illumination capabilities can be achieved.

In a light radiation device including an upstream radiation portion, a middle radiation portion and a downstream radiation portion, the upstream radiation portion overlaps a nozzle array in a transportation direction. A controller includes a path controller to control a path operation of ejecting ink from the nozzle array onto a medium while moving a recording head and the light radiation device in a scanning direction, a transportation controller to control a transportation operation of, after the path operation, transporting the medium downstream in the transportation direction by a distance shorter than a length in the transportation direction of the nozzle array, and a first light radiation controller to control the light radiation device, during the path operation by the path controller, to turn on the upstream radiation portion and the downstream radiation portion and to turn off the middle radiation portion.

There is provided a light irradiator including: light sources forming first and second light source rows; a heat sink; a substrate including first and second traces connected to the first and second light source rows, respectively; and a fixing part configured to fix the heat sink to the substrate. The fixing part is arranged between adjacent light sources included in the first light source row and adjacent in the first light source row; and the fixing part is not arranged between adjacent light sources included in the second light source row and adjacent in the second light source row. The first trace includes a first circumventing part configured to circumvent the fixing part; and the second trace includes a second circumventing part configured to circumvent the fixing part and having a directional component different from the first direction.

The light irradiation device includes a housing an air inlet through which cooling wind is introduced into the housing, an air outlet through which the cooling wind is discharged, a wind flow path through which the cooling wind taken in through the air inlet into the housing flows toward the air outlet, a light source part configured to be able to emit light toward the outside of the housing, and a heat sink provided at a position opposite to the first surface based on the light source part, in the wind flow path, wherein the wind flow path includes a first wind flow region and a second wind flow region located closer to the air outlet than the first wind flow region and having a smaller flow path cross sectional area than the first wind flow region.

A drying assembly comprises a plurality of electromagnetic energy sources arranged to dry printing fluid deposited onto a surface of a substrate, by evaporation of a solvent fluid therefrom. The drying assembly further comprises a conveyor system configured to move the substrate in a conveying direction, and a focusing system configured to focus electromagnetic energy from the plurality of electromagnetic energy sources to form a non-uniform heating pattern on the surface of the substrate. The non-uniform heating pattern comprises a plurality of spatially separated higher and lower intensity regions distributed along the conveying direction.

A light source device includes a casing including one end surface, other end surface, and one side surface between the one end surface and the other end surface, a light emitting unit provided on a side of the one end surface in the casing, a heat radiating unit provided in the casing and thermally connected to the light emitting unit, an exhaust port formed at least in a region located in one side surface and facing the heat radiating unit, an axial fan which is provided in the casing and supplies cooling air to the heat radiating unit, and a shielding deflecting plate which is provided between the axial fan and the heat radiating unit and shields a part of the cooling air supplied from the axial fan and deflects a part of the cooling air to a direction away from the exhaust port.

There is provided an ultraviolet ray irradiating apparatus configured to cure an ultraviolet-curable ink, the ultraviolet ray irradiating apparatus including a plurality of light emitting chips configured to emit an ultraviolet ray and arranged with a first pitch in main scanning direction and with a second pitch greater than the first pitch in sub scanning direction. The printing object includes a low part in which a distance from an ultraviolet ray irradiation surface becomes to be a large gap and a high part in which the distance from the ultraviolet ray irradiation surface becomes to be a small gap. The ultraviolet ray irradiating apparatus is configured to irradiate the object such that an illuminance, of the ultraviolet ray is not less than a minimum illuminance required for curing, in an area, of the low part, onto which the ink is discharged by a nozzle outermost in the sub scanning direction.

A light irradiator includes a light source, a heat-dissipating member thermally connected to the light source, a drive including a drive circuit for the light source, a housing having vents and an irradiation opening for light from the light source to pass, and a blower. The rectangular housing has a first surface having a first side with a first dimension and a second side with a second dimension, a second surface having the second side and a third side with a third dimension, and a third surface having the first and third sides. The opening is in the first surface. A first vent and a second vent are in the second surface, with the first vent nearer the opening, and the second vent opposite to the opening. The heat-dissipating member faces the first vent. The drive is between the first and second vents. The blower faces the second vent.

Provided is an ink jet printer including: an electromagnetic wave generator that includes an electromagnetic wave generation section, a high-frequency voltage generation section generating a voltage applied to the electromagnetic wave generation section, and a transmission line coupling the electromagnetic wave generation section and the high-frequency voltage generation section to each other in which the electromagnetic wave generation section includes a first electrode, a second electrode, a first conductor that couples the first electrode and the transmission line to each other, and a second conductor that couples the second electrode and the transmission line to each other, a minimum separation distance between the first conductor and the second conductor is 1/10 or less of a wavelength of an output electromagnetic wave, and the first conductor includes a coil, and the coil is disposed at a position closer to the first electrode than the transmission line; a carriage that reciprocates in a width direction of a recording medium; and an ink jet head, in which a thin ink film of the ink discharged from the ink jet head and attached to the recording medium is dried by the electromagnetic wave generator.