Liquid ejection head, liquid ejection apparatus, flow path member, and method for manufacturing liquid ejection head

1. A liquid ejection head comprising: a liquid supply unit having a supply passage for liquid formed therein; and a liquid ejection unit capable of ejecting the liquid supplied through the supply passage from an ejection port,

wherein the liquid supply unit includes first and second flow path forming members having first and second opposed surfaces opposed to each other, and a joining member which joins the first and second flow path forming members,

the first opposed surface has a groove portion which forms the supply passage, and a protruding portion protruding from the first opposed surface to form a side wall of the groove portion,

the second opposed surface has a lid portion which abuts against the protruding portion to cover the opening of the groove portion, and

the joining member is formed of a resin to come into contact with an outer surface of the protruding portion, the first opposed surface, and the second opposed surface.

2. The liquid ejection head according to claim 1 , wherein at least some parts of a range of the groove portion in a depth direction and a range of the joining member in a thickness direction overlap each other in a direction in which the protruding portion protrudes.

3. The liquid ejection head according to claim 1 , wherein the lid portion is located in a recessed portion formed in the second opposed surface.

4. The liquid ejection head according to claim 3 , wherein the lid portion is located closer to the bottom surface side of the recessed portion than the second opposed surface.

5. The liquid ejection head according to claim 1 , wherein the protruding portion includes a first protruding portion located on one side of both side edges of the groove portion, and a second protruding portion located on the other side.

6. The liquid ejection head according to claim 5 , wherein a width of the lid portion is longer than a distance between inner surfaces of the first and second protruding portions, and is shorter than a distance between outer surfaces of the first and second protruding portions.

7. The liquid ejection head according to claim 5 , wherein the lid portion is located in a recessed portion formed on the second opposed surface, and the width of the recessed portion is longer than the distance between the outer surfaces of the first and second protruding portions.

8. The liquid ejection head according to claim 1 , wherein the first flow path forming member has a connecting portion for connecting the supply passage to the liquid ejection unit, at a position corresponding to the bottom of the groove portion, when viewed from a direction orthogonal to the first opposed surface.

9. The liquid ejection head according to claim 1 , wherein a plurality of supply passages is formed in the liquid supply unit, and

at least one of the plurality of supply passages is formed by a second opposed surface side groove portion provided on the second opposed surface, and a first opposed surface side lid portion provided on the first opposed surface formed to cover the opening of the second opposed surface side groove portion.

10. The liquid ejection head according to claim 9 , wherein an abutment position between the protruding portion of the first opposed surface and the lid portion of the second opposed surface and an abutment position between the opening of the second opposed surface side groove portion and the first opposed surface side lid portion are located on the same plane.

11. A liquid ejection apparatus comprising: a supply portion for liquid; a liquid ejection head capable of ejecting the liquid, which is supplied from the supply portion, from an ejection port using an ejection energy generation element; and a control unit which controls the ejection energy generation element,

wherein the liquid ejection head comprises a liquid supply unit having a supply passage of the liquid formed therein, and a liquid ejection unit capable of ejecting the liquid supplied through the supply passage from the ejection port,

the liquid supply unit includes first and second flow path forming members having first and second opposed surfaces opposed to each other, and a joining member which joins the first and second flow path forming members,

the first opposed surface has a groove portion which forms the supply passage, and a protruding portion protruding from the first opposed surface to form a side wall of the groove portion,

the second opposed surface has a lid portion which abuts against the protruding portion to cover the opening of the groove portion, and

the joining member is formed of a resin to come into contact with an outer surface of the protruding portion, the first opposed surface, and the second opposed surface.

12. A flow path member having a supply passage for supplying liquid to a liquid ejection head which ejects the liquid, the flow path member comprising:

first and second flow path forming members having first and second opposed surfaces opposed to each other, and a joining member which joins the first and second flow path forming members,

wherein the first opposed surface has a groove portion which forms the supply passage, and a protruding portion protruding from the first opposed surface to form a side wall of the groove portion,

the second opposed surface has a lid portion which abuts against the protruding portion to cover the opening of the groove portion, and

the joining member is formed of a resin to come into contact with an outer surface of the protruding portion, the first opposed surface, and the second opposed surface.

13. The flow path member according to claim 12 , wherein at least some parts of a range of the groove portion in a depth direction and a range of the joining member in a thickness direction overlap each other, in a direction in which the protruding portion protrudes.

14. The flow path member according to claim 12 , wherein the lid portion is located in a recessed portion formed in the second opposed surface, and is located closer to the bottom surface side of the recessed portion than the second opposed surface.

15. The flow path member according to claim 12 , wherein the protruding portion includes a first protruding portion located on one side of both side edges of the groove portion, and a second protruding portion located on the other side thereof, and

a width of the lid portion is longer than a distance between inner surfaces of the first and second protruding portions, and is shorter than a distance between outer surfaces of the first and second protruding portions.

16. A method for manufacturing a liquid ejection head comprising a liquid supply unit having a supply passage for liquid formed therein, and a liquid ejection unit capable of ejecting the liquid supplied through the supply passage from an ejection port, the liquid supply unit including first and second flow path forming members having first and second opposed surfaces opposed to each other, and a joining member which joins the first and second flow path forming members, the method comprising the steps of:

injection-molding the first flow path forming member having a groove portion forming the supply passage, and a protruding portion protruding from the first opposed surface to form a side wall of the groove portion, on the first opposed surface, at a first position between first and second molds, and injection-molding the second flow path forming member having a lid portion abutting against the protruding portion to cover the opening of the groove portion on the second opposed surface, at a second position between the first and second molds;

opening the first and second molds, while holding the first flow path forming member in the first mold and holding the second flow path forming member in the second mold;

relatively moving the first and second molds so that the protruding portion of the first flow path forming member and the lid portion of the second flow path forming member are made to face each other;

closing the first and second molds so that the protruding portion and the lid portion are made to abut against each other; and

injection-molding the joining member which abuts against an outer surface of the protruding portion, the first opposed surface, and the second opposed surface.