Patent ID: 7771011

Claim:
A method for arranging liquid droplet ejection heads, the method comprising: arranging and fixing a plurality of inkjet liquid droplet ejection heads, ejecting a common functional liquid, on a common carriage plate, based on the amount of liquid droplets ejected from a number of ejecting nozzles in a nozzle row that each of the liquid droplet ejection heads has, with the heads shifted in a direction of the nozzle row, the liquid droplet ejection heads being so arranged and fixed that in the liquid droplet ejection heads closely aligned in the direction of the nozzle row, a difference between the amounts of liquid droplets ejected from two ejection nozzles located at each innermost end of the liquid droplet ejection heads is within a predetermined range of tolerance, and the amounts of liquid droplets ejected from two ejection nozzles located at the outermost ends in the direction of the nozzle row on the carriage plate are within a predetermined range of a reference amount.