Liquid ejection head and liquid ejection apparatus having pitch conversion member

A liquid ejection apparatus comprising:

• a liquid ejection head configured to eject liquid and comprising a print element substrate including a plurality of first channels;
• a channel member including a plurality of second channels;
• and a pitch conversion member arranged between the print element substrate and the channel member to convert a first array pitch in a first array direction of the plurality of first channels into a second array pitch in the first array direction of the plurality of second channels, wherein the pitch conversion member includes a plurality of first openings respectively connected to the plurality of first channels, and a plurality of second openings respectively connected to the plurality of second channels, wherein a region where a plurality of the first openings are provided and a region where a plurality of the second openings are provided overlap as viewed from a penetration direction of the first openings and the second openings, and wherein a first distance in a second array direction between the two first openings closest to each other in the second array direction intersecting the first array direction is shorter than a second distance in the second array direction between the two second openings closest to each other in the second array direction;
• a control unit configured to control the liquid ejection head;
• and
• a liquid feed unit configured to supply the liquid ejection head with liquid,
• wherein a pitch conversion hole including one of the first openings and one of the second opening includes a first region whose diameter is reduced from a bonding surface bonded to the print element substrate in the penetration direction,
• a second region whose diameter is maintained from the first region in the penetration direction, and
• a third region whose diameter is increased from the second region in the penetration direction, and
• wherein an area of the second region in the penetration direction is smaller than areas of the first region and the third region.

A liquid ejection head configured to eject liquid, the liquid ejection head comprising:

• a print element substrate including a plurality of first channels;
• a channel member including a plurality of second channels;
• and
• a pitch conversion member arranged between the print element substrate and the channel member to convert a first array pitch in a first array direction of the plurality of first channels into a second array pitch in the first array direction of the plurality of second channels,
• wherein the pitch conversion member includes a plurality of first openings respectively connected to the plurality of first channels, and a plurality of second openings respectively connected to the plurality of second channels,
• wherein a region where a plurality of the first openings are provided and a region where a plurality of the second openings are provided overlap as viewed from a penetration direction of the first openings and the second openings,
• wherein a first distance in a second array direction between the two first openings closest to each other in the second array direction intersecting the first array direction is shorter than a second distance in the second array direction between the two second openings closest to each other in the second array direction, and
• wherein a plurality of a pitch conversion holes include a first pitch conversion hole for supplying the print element substrate with a predetermined liquid and a second pitch conversion hole for collecting the predetermined liquid from the print element substrate.