Patent ID: 7121643

Claim:
An ink-jet printing head comprising: a head unit which includes a plurality of nozzles from which inks of different kinds are ejected onto a recording medium and a plurality of ink supply ports from which said inks of different kinds are respectively supplied and which are open in a surface of said head unit, said plurality of ink supply ports being spaced apart from each other; and a joint member having a plurality of channels which are open in a suface of said joint member and which are spaced apart from each other, said joint member being connected at said suface thereof to said surface of said head unit, such that said plurality of channels communicte with said plurality of ink supply ports, respectively, wherein at least one recess is formed on at least one of said surface of said head unit and said surface of said joint member such that each of said at least one recess is located at least one of between adjacent ones of said plurality of channels and between adjacent ones of said plurality of ink supply ports, and wherein said plurality of ink supply ports are formed at one of opposite ends of ink passages which are formed in said head unit and which communicate with said plurality of nozzles, said one of the opposite ends being more distant from said plurality of nozzles than the other of the opposite ends, and said joint member includes a flange portion connected at one of opposite surfaces thereof to said surface of said head unit and a plurality of tubular portions formed on the other of the opposite surfaces of said flange portion, said plurality of channels extending through the respective tubular portions and said flange portion, said each of said at least one recess being formed in said one of the opposite surfaces of said flange portion.