Liquid ejecting head unit, liquid ejecting head module, liquid ejecting apparatus, and method of manufacturing liquid ejecting head unit

A liquid ejecting head module comprising:

• a liquid ejecting head unit having a liquid ejecting surface from which a liquid is ejected;
• and
• a frame body provided with an exposure opening through which the liquid ejecting surface is exposed,
• wherein the liquid ejecting head unit includes:
• a fixing plate that has a bottom section having a first surface and a second surface, and a side surface section extending from the second surface side toward the first surface side of the bottom section, and that is provided with an opening in the bottom section,
• a head,
• a reinforcement plate that is stacked on the fixing plate and is provided with a through-holes into which the head is inserted, and
• a channel holder that is provided with a channel and that supplies a liquid to the head,
• wherein the head includes:
• a nozzle plate provided with a nozzle row, and
• a channel substrate that is stacked on the nozzle plate, and is provided with a channel communicating with the channel of the channel holder,
• wherein the head is fixed to the first surface of the fixing plate, on the second surface side from the channel substrate,
• wherein the nozzle plate and a second surface of the fixing plate defines an ejection surface,
• wherein the exposure opening is defined by a facing surface of the frame body facing the side surface section,
• wherein the frame body exposes the second surface of the fixing plate in a state in which the facing surface and the fixing plate are separated by a gap therebetween, and
• wherein a height of the side surface section of the fixing plate is higher than a height of the facing surface of the frame body.

A method of manufacturing a liquid ejecting head unit that includes

• a fixing plate provided with a plurality of openings,
• a plurality of heads, each of which is provided for each of the openings,
• a reinforcement plate that is stacked on the fixing plate and is provided with a plurality of through-holes into which the heads are inserted, and
• a channel holder that is provided with a plurality of channels and that accommodates the plurality of heads in cooperation with the fixing plate,
• wherein the fixing plate has a bottom section formed of a first surface and a second surface and a rounded section that is rounded from the second surface toward the first surface,
• wherein each of the heads has a nozzle plate provided with a nozzle row having a plurality of nozzles from which a liquid is ejected and a channel substrate provided with a channel through which the channel of the channel holder communicates with the nozzle, and
• wherein the head is fixed to the first surface of the bottom section of the fixing plate, and the head has a discharge surface defined by the second surface of the fixing plate and the nozzle plate,
• the method of manufacturing a liquid ejecting head unit comprising:
• providing the opening in a plate-shaped member;
• cutting an edge, which becomes the side surface sections of the fixing plate, from the plate-shaped member;
• cutting an edge, which becomes the rounded portion, from the plate-shaped member;
• forming the rounded portion on the plate-shaped member;
• following forming the rounded portion, bending a region of the plate-shaped member, which becomes the side surface sections, and forming the fixing plate with the rounded portion disposed between adjacent side surface sections;
• fixing the plurality of heads to the first surface of the fixing plate;
• and
• fixing the fixing plate, to which the plurality of heads are fixed, to the channel holder.