Patent ID: 7690768

Claim:
A liquid ejecting head comprising a plurality of liquid ejecting portions arrayed in a flat region on a substrate, the liquid ejecting portions each including: a liquid chamber that accommodates liquid to be ejected; a heater element arranged in the liquid chamber, the heater element generating bubbles in liquid in the liquid chamber when heated; and a nozzle for ejecting liquid in the liquid chamber in accordance with generation of bubbles by the heater element, wherein of a plurality of the heater elements, the center of the heater element located at the M-th position (M is either an odd number or even number) as counted from one end side is arranged on a straight line L 1 , which extends along an array direction of the heater element, or in its vicinity, and the center of the heater element located at the N-th position (N is an even number when the M is an odd number, and N is an odd number when the M is an even number) as counted from the one end side is arranged on a straight line L 2 or in its vicinity, the straight line L 2 being parallel to the straight line L 1 and spaced at an interval δ (δ is a real number larger than 0) from the straight line L 1 , the liquid chamber is formed in a substantially recessed configuration in plan view so as to surround three sides of the heater element, a plurality of the heater elements are arrayed at a constant pitch P in the directions of the straight line L 1 and the straight line L 2 , the liquid chamber that surrounds the heater element arranged on the straight line L 1 or in its vicinity, and the liquid chamber that surrounds the heater element arranged on the straight line L 2 or in its vicinity are arranged so that their opening portions are opposed to each other, a gap Wx (Wx is a real number larger than 0) is formed at least one of between the liquid chambers that are arrayed on the straight line L 1 or in its vicinity and spaced from each other by a distance 2P, and between the liquid chambers that are arrayed on the straight line L 2 or in its vicinity and spaced from each other by the distance 2P, with respect to an array direction of the liquid chamber, a gap Wy (Wy is a real number larger than 0, where Wy>Wx) is formed between the liquid chamber arrayed on the straight line L 1 or in its vicinity, and the liquid chamber arrayed on the straight line L 2 or in its vicinity, with respect to a direction perpendicular to the array direction of the liquid chamber, and a liquid channel having a width equal to the gap Wx, and a liquid channel having a width equal to the gap Wy are formed by the gap Wx and the gap Wy, respectively.