Liquid supply part, liquid ejection head, and method of manufacturing liquid supply part

A liquid ejection head comprising:

• a liquid supply part in which a first component and a second component are coupled to each other with a filter laid between a first opening portion of the first component and a second opening portion of the second component by pouring a molten resin between the first component and the second component, so that the first component and the second component form a liquid supply passage continuously extending through the first opening portion, the filter, and the second opening portion;
• and
• an ejection portion capable of ejecting liquid supplied from the liquid supply passage of the liquid supply part, wherein
• a peripheral portion of the filter includes a short-side portion and a long-side portion,
• the first component and the second component each include a first holding section and a second holding section, the long-side portion of the filter being compressively held between the first holding sections, and the short-side portion of the filter being compressively held between the second holding sections,
• at least one of the first component and the second component includes a wall portion configured to isolate the long-side portion and the resin from each other, and
• the short-side portion and the resin are in contact with each other.

A method of manufacturing a liquid supply part in which a first component and a second component are coupled to each other with a filter laid between a first opening portion of the first component and a second opening portion of the second component by pouring a molten resin between the first component and the second component, so that the first component and the second component form a liquid supply passage continuously extending through the first opening portion, the filter, and the second opening portion, the method comprising:

• a first step of preparing the first component and the second component;
• a second step of preparing the filter having a peripheral portion including a short-side portion and a long-side portion;
• a third step of compressively holding the peripheral portion of the filter between the first component and the second component;
• and
• a fourth step of pouring the molten resin between the first component and the second component such that the resin is kept out of contact with the long-side portion of the filter and permeates the short-side portion of the filter.