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A manufacturing method of a liquid ejection head provided with a flow passage communicating with an ejection outlet for ejecting liquid includes steps of preparing a substrate on which a flow passage wall forming member for forming a part of a wall of the flow passage and a solid layer having a shap

A manufacturing method of a liquid ejection head provided with a flow passage communicating with an ejection outlet for ejecting liquid includes steps of preparing a substrate on which a flow passage wall forming member for forming a part of a wall of the flow passage and a solid layer having a shape of a part of the flow passage contact each other, wherein the flow passage wall forming member has a height, from a surface of the substrate, substantially equal to that of the solid layer; providing on the solid layer a pattern having a shape of another part of the flow passage; providing a coating layer, for forming another part of the wall of the flow passage, so as to coat the pattern; providing the ejection outlet to the coating layer; and forming the flow passage by removing the solid layer and the pattern.

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1. A manufacturing method of a liquid ejection head provided with a flow passage communicating with an ejection outlet for ejecting liquid, said manufacturing method comprising: preparing a substrate on which a flow passage wall forming member for forming a part of a wall of the flow passage and a s

1. A manufacturing method of a liquid ejection head provided with a flow passage communicating with an ejection outlet for ejecting liquid, said manufacturing method comprising: preparing a substrate on which a flow passage wall forming member for forming a part of a wall of the flow passage and a solid layer having a shape of a part of the flow passage contact each other, wherein the substrate has an energy generating element and the solid layer includes a region covering the energy generating element and a region covering the flow passage wall forming member;abrading the solid layer in a direction toward the substrate to form a flattened surface of the solid layer;providing, on the flattened surface of the solid layer, a layer forming a pattern having a shape of another part of the flow passage;providing a coating layer, for forming another part of the wall of the flow passage, so as to coat the layer forming the pattern;providing the ejection outlet in the coating layer; andforming the part of the flow passage by removing the solid layer, and forming the another part of the flow passage by removing the layer of the pattern in its entirety. 2. The method according to claim 1, wherein the pattern extends from the flattened surface of the solid layer to a surface of the flow passage wall forming member. 3. The method according to claim 1, wherein the pattern and the solid layer are formed of different positive photosensitive resin materials. 4. The method according to claim 1, wherein the pattern and the solid layer are formed of the same positive photosensitive resin material. 5. The method according to claim 1, wherein the liquid ejection head is provided with a plurality of flow passages, wherein the solid layer corresponds to a first flow passage and another solid layer corresponds to a second flow passage, with the solid layer and the another solid layer having substantially equal widths, andwherein the pattern corresponds to the first flow passage and another pattern corresponds to the second flow passage, with the pattern and the another pattern having different widths with respect to a direction parallel to a surface of the substrate. 6. The method according to claim 1, wherein the substrate is prepared by: providing the flow passage wall forming member on the substrate; andproviding the solid layer on the substrate so as to coat the flow passage wall forming member. 7. The method according to claim 1, wherein the solid layer is abraded by a chemical mechanical polish technique. 8. The method according to claim 1, wherein the coating layer coats the pattern so as to cover an upper surface and side surfaces of the pattern. 9. A manufacturing method of a liquid ejection head provided with a flow passage communicating with an ejection outlet for ejecting liquid, said manufacturing method comprising: preparing a substrate on which a solid layer is provided;abrading the solid layer in a direction toward the substrate to form a flattened surface of the solid layer so that the solid layer has a shape of a part of the flow passage;providing, on the flattened surface of the solid layer, a layer forming a pattern having a shape of another part of the flow passage;providing a coating layer, for forming a wall of the flow passage, so as to coat the layer forming the pattern;forming the ejection outlet in the coating layer; andforming the part of the flow passage by removing the solid layer, and forming the another part of the flow passage by removing the layer of the pattern in its entirety. 10. The method according to claim 9, wherein the pattern and the solid layer are formed of different positive photosensitive resin materials. 11. The method according to claim 9, wherein the pattern and the solid layer are formed of the same positive photosensitive resin material. 12. The method according to claim 9, wherein the liquid ejection head is provided with a plurality of flow passages, wherein the solid layer corresponds to a first flow passage and another solid layer corresponds to a second flow passage, with the solid layer and the another solid layer having substantially equal widths, andwherein the pattern corresponds to the first flow passage and another pattern corresponds to the second flow passage, with the pattern and the another pattern having different widths with respect to a direction parallel to a surface of the substrate. 13. The method according to claim 9, wherein the solid layer is abraded by a chemical mechanical polish technique. 14. The method according to claim 9, wherein the coating layer coats the pattern so as to cover an upper surface and side surfaces of the pattern. 15. The method according to claim 9, wherein a width of the solid layer is wider than a width of the layer forming the pattern having the shape of the another part of the flow passage with respect to a direction parallel to a surface of the substrate. 16. A manufacturing method of a liquid ejection head provided with a flow passage communicating with an ejection outlet for ejecting liquid, said manufacturing method comprising: preparing a substrate on which a solid layer is provided;abrading the solid layer in a direction toward the substrate by a chemical mechanical polish technique to form an abraded surface of the solid layer, so that they solid layer has a shape of a part of the flow passage;providing, on the abraded surface of the solid layer, a layer forming a pattern having a shape of another part of the flow passage;providing a coating layer, for forming a wall of the flow passage, so as to coat the layer forming the pattern;forming the ejection outlet in the coating layer; andforming the part of the flow passage by removing the solid layer, and forming the another part of the flow passage by removing the layer of the pattern in its entirety. 17. The method according to claim 16, wherein a width of the solid layer is wider than a width of the layer forming the pattern having the shape of the another part of the flow passage with respect to a direction parallel to a surface of the substrate.