Ink jet printer

An ink jet printer forming an image using ultraviolet curing ink, comprising:

• an ink jet head configured to eject out the ultraviolet curing ink onto a predetermined sheet,
• moving means for moving said ink jet head relatively to said sheet;
• and
• a plurality of light emitting diode (LED) elements arranged in adjacent columns and rows, the LED elements including a plurality of first-wavelength LED elements and a plurality of second-wavelength LED elements, said first-wavelength LED elements and said second-wavelength LED elements being arranged alternately,
• wherein said moving means moves said ink jet head in the main scanning direction which is a feeding direction of said sheet, and in the secondary scanning direction which intersects with said feeding direction of the sheet at right angles, and said first-wavelength LED elements are arranged in the secondary direction of said ink jet head and said second-wavelength LED elements are arranged on the main scanning side of said ink jet head.

A system comprising:

• a printer head configured to move along a main scanning direction and a secondary scanning direction;
• a first group of light emitting diode (LED) elements abutting one side of the printer head;
• a second group of LED elements abutting another side of the printer head, wherein the first group and the second group are arranged along the secondary scanning direction;
• and
• a third group of LED elements disposed near the printer head and arranged along the main scanning direction.