Liquid ejecting head and liquid ejecting apparatus

摘要

The portions at the circumferential edges of a flow channel formation plate in which the corner portions of a dummy flow channel portion are formed are weaker than other portions, and thus when thermal stress has occurred due to temperature changes when the constituent elements of a flow channel unit are affixed to each other, cracks can be induced preferentially in the weak portion, rather than the other portions, starting from the ends of the corner portions. In particular, although similar corner portions are formed in a common liquid chamber, the intersection angle of the corner portions in the dummy flow channel portion is smaller than the intersection angle of the corner portions in the common liquid chamber, and thus it is easier for stress to concentrate in the corner portions of the dummy flow channel portion.

主权项

1. A liquid ejecting head comprising: a flow channel formation plate including a common liquid chamber that communicates with a plurality of pressure chambers, and including a dummy flow channel portion that is formed opposing the common liquid chamber, wherein the common liquid chamber includes a first acutely angled corner portion that is defined by a first surface that follows a lengthwise direction of the common liquid chamber and a second surface that intersects a close-packed plane of a crystal structure of the flow channel formation plate, the first acutely angled corner portion extending toward an edge of the flow channel formation plate; the dummy flow channel portion includes a second acutely angled corner portion that is defined by the close-packed plane of the crystal structure and a third surface that intersects the close-packed plane, the second acutely angled corner portion extending toward the edge of the flow channel formation plate; and the second acutely angled corner includes an acute angle that is smaller than an acute angle of the first acutely angled corner portion.