Liquid ejection head
A liquid ejection head includes a printing element substrate including an ejection surface provided with a first ejection orifice array in which ejection orifices configured to be capable of ejecting a liquid are arranged in plurality in an array direction and a second ejection orifice array arranged in a direction intersecting with the array direction and the first ejection orifice array; and a protective member provided with a first opening corresponding to the first ejection orifice array and a second opening corresponding to the second ejection orifice array. The protective member is arranged adjacent to the ejection surface of the printing element substrate via an adhesive arranged between the first ejection orifice array and the second ejection orifice array.
1 . A liquid ejection head, comprising:
a printing element substrate including an ejection surface provided with a first ejection orifice array and a second ejection orifice array, each including a plurality of ejection orifices configured to eject a liquid, the first ejection orifice array and the second ejection orifice array being arranged relative to one another in a direction intersecting with an array direction in which the ejection orifices of the first ejection orifice array are arrayed; and
a protective member provided with a first opening corresponding to the first ejection orifice array and a second opening corresponding to the second ejection orifice array, wherein
the protective member is arranged adjacent to the ejection surface of the printing element substrate via an adhesive arranged between the first ejection orifice array and the second ejection orifice array,
wherein a recessed part is formed on the ejection surface and the adhesive is applied to the recessed part, and
wherein the recessed part is formed so as to enclose each of the first ejection orifice array and the second ejection orifice array.
2 . The liquid ejection head according to claim 1 , wherein the adhesive is intermittently applied in array directions of the first ejection orifice array and the second ejection orifice array.
3 . The liquid ejection head according to claim 1 , wherein the adhesive is continuously applied in array directions of the first ejection orifice array and the second ejection orifice array.
4 . The liquid ejection head according to claim 1 , wherein another recessed part is further formed on the ejection surface on an outer side of the recessed part, which is formed so as to enclose each of the first ejection orifice array and the second ejection orifice array.
5 . The liquid ejection head according to claim 4 , wherein the recessed part and the other recessed part are connected in a groove shape.
6 . The liquid ejection head according to claim 5 , wherein a width of the recessed part and the other recessed part is shorter than a beam width between the first and second openings of the protective member.
7 . The liquid ejection head according to claim 6 , wherein the ejection surface has repellency with respect to the liquid and the recessed part and the other recessed part have non-repellency with respect to the liquid.
8 . The liquid ejection head according to claim 7 , wherein the ejection surface is made of resin.
9 . The liquid ejection head according to claim 8 , wherein a ratio of a total area of the first and second openings to an area of a main face of the protective member is 70% or lower.
10 . The liquid ejection head according to claim 9 , wherein
a width of the respective first and second openings is equal to or longer than a diameter of the respective ejection orifices and less than an interval between the first ejection orifice array and the second ejection orifice array, and
a thickness of the protective member is equal to or thinner than a thickness of the printing element substrate.
11 . The liquid ejection head according to claim 10 , wherein a width of the respective first and second openings is 200 μm or more and a thickness of the protective member is less than 50 μm.
12 . The liquid ejection head according to claim 11 , wherein an opening or a notch is formed in the protective member in conformity with an alignment mark, a printing element substrate number, or an ejection orifice number provided on the printing element substrate.
13 . The liquid ejection head according to claim 12 , wherein the notch is formed in a rounded shape.
14 . The liquid ejection head according to claim 13 , wherein corners of the protective member are formed in a rounded shape.
15 . The liquid ejection head according to claim 14 , wherein a material of the protective member has a higher modulus of elasticity than that of a material of the ejection orifices.
16 . The liquid ejection head according to claim 15 , wherein a material of the protective member has a same coefficient of linear expansion as that of a material of the printing element substrate.
17 . The liquid ejection head according to claim 16 , wherein the protective member is made of metal.
18 . The liquid ejection head according to claim 17 , wherein the protective member is made of stainless steel.
19 . The liquid ejection head according to claim 18 , wherein an adhesion layer is formed on at least a side of the ejection surface of the protective member.
20 . The liquid ejection head according to claim 19 , wherein the printing element substrate is arrayed in plurality on a flow path member so that at least parts overlap with each other.
21 . The liquid ejection head according to claim 20 , wherein the liquid ejection head is a line head corresponding to a width of a printing medium.
22 . The liquid ejection head according to claim 1 , further comprising:
an energy generating element used to eject the liquid; and
a pressure chamber internally including the energy generating element, wherein the liquid in the pressure chamber is circulated between inside and outside of the pressure chamber.
23 . The liquid ejection head according to claim 1 , wherein a groove in a first direction in which the recessed part is formed between the first ejection orifice array and the second ejection orifice array and a groove in a second direction which intersects with the groove in the first direction are formed, and the recessed part is shaped such that a width of the recessed part in which the groove in the second direction is formed is narrower than an average width of the recessed part which is formed in the groove in the first direction.
24 . The liquid ejection head according to claim 23 , wherein an average width of the groove in the first direction is 80 μm or more and 150 μm or less and a width of the groove in the second direction is 20 μm or more and 70 μm or less.
25 . The liquid ejection head according to claim 23 , wherein an intersecting part of the groove in the first direction and the groove in the second direction has a chamfered shape.
26 . The liquid ejection head according to claim 23 , wherein only an acute angle part of an intersecting part of the groove in the first direction and the groove in the second direction has a chamfered shape.
27 . The liquid ejection head according to claim 23 , wherein a width between the groove in the second direction and a chip end in an ejection orifice array direction is 5 μm or more and 20 μm or less.