Liquid ejecting head and liquid ejecting apparatus
A liquid ejecting head includes a substrate including ejection openings configured to eject liquid; a flow-path member supporting the substrate and having a supply flow path that supplies the substrate with liquid, on one side with respect to a predetermined direction intersecting the arrangement direction of the ejection openings, and a collection flow path that collects liquid from the substrate, on the other side; and a heating unit that heats an ejection region including the liquid ejection openings in the substrate. On sides of the ejection region of the substrate in the predetermined direction, the collection flow path is located on a side where the distance between the ejection region and a side of the substrate in the predetermined direction is longer and the supply flow path is located on a side where the distance between the ejection region and a side of the substrate in the predetermined direction is shorter.
1 . A liquid ejecting head comprising:
an ejection opening row including a plurality of ejection openings configured to eject liquid;
a liquid supply path to supply liquid to the plurality of ejection openings;
a liquid collection path to collect liquid not ejected through the plurality of ejection openings;
energy generation elements configured to generate energy to eject liquid through the ejection openings;
a common supply flow path to supply liquid to a plurality of liquid supply paths;
a common collection flow path to collect liquid from a plurality of liquid collection paths; and
a heating unit configured to heat an ejection region including the ejection openings,
wherein, on sides of the ejection region with respect to a predetermined direction intersecting an arrangement direction of the ejection openings, a first non-ejection region and a second non-ejection region are provided, with the first non-ejection region being located on a first side and the second non-ejection region being located on a second side,
the ejection region is located so as to be shifted toward the second non-ejection region,
as viewed from a direction orthogonal to a surface having the ejection opening row, there are a first overlap region in which the first non-ejection region and the common collection flow path at least partially overlap each other and a second overlap region in which the second non-ejection region and the common supply flow path at least partially overlap each other, and
an area of the first overlap region is larger than an area of the second overlap region.
2 . The liquid ejecting head according to claim 1 , further comprising:
a substrate including the ejection opening row, the liquid supply path, the liquid collection path, and the energy generation elements; and
a flow-path member supporting the substrate and having the common supply flow path and the common collection flow path.
3 . The liquid ejecting head according to claim 2 ,
wherein the substrate has a terminal for being electrically connected to the outside, on the first side in the predetermined direction.
4 . The liquid ejecting head according to claim 2 ,
wherein the substrate is placed on the flow-path member with a support member interposed therebetween, the support member supporting the substrate and including liquid communication openings fluidically connected to the substrate and the flow-path member,
in the flow-path member, a first communication opening connecting the common supply flow path and one of the liquid communication openings is located on one side of the substrate in the predetermined direction, and
a second communication opening connecting the common collection flow path and the other of the liquid communication openings is located on other side of the substrate in the predetermined direction.
5 . The liquid ejecting head according to claim 4 ,
wherein the distance between the first communication opening and a first end portion of the substrate on the one side in the predetermined direction is shorter than the distance between the second communication opening and a second end portion of the substrate on the other side in the predetermined direction.
6 . The liquid ejecting head according to claim 4 ,
wherein the distance between the first communication opening and a third end portion of the flow-path member on the one side in the predetermined direction is shorter than the distance between the second communication opening and a fourth end portion of the flow-path member on the other side in the predetermined direction.
7 . The liquid ejecting head according to claim 1 ,
wherein the energy generation elements are heat generation elements, and
the heating unit is either a heater configured to operate according to the temperature of the substrate or the heat generation elements which operate without ejecting liquid through the ejection openings according to the temperature, or both.
8 . The liquid ejecting head according to claim 1 ,
wherein the liquid ejecting head is configured to eject one kind of liquid.
9 . The liquid ejecting head according to claim 1 ,
wherein the flow-path member supports a plurality of substrates.
10 . The liquid ejecting head according to claim 9 ,
wherein the flow-path member extends in the arrangement direction, and
the common supply flow path and the common collection flow path extend in the arrangement direction.
11 . The liquid ejecting head according to claim 1 , further comprising:
a first opening row in which a plurality of first openings that are openings to supply liquid to the plurality of liquid supply paths from the common supply flow path and that individually correspond to the liquid supply paths are arranged in the predetermined direction; and
a second opening row in which a plurality of second openings that are openings to collect liquid from the plurality of liquid collection paths to the common collection flow path and that individually correspond to the liquid collection paths are arranged in the predetermined direction, and
wherein all of the plurality of first openings corresponding to the liquid supply paths are included in the first opening row, and all of the plurality of second openings corresponding to the liquid collection paths are included in the second opening row.
12 . The liquid ejecting head according to claim 11 ,
wherein the liquid ejecting head includes a plurality of the first opening rows and a plurality of the second opening rows, and
the first opening rows and the second opening rows are alternately located in the arrangement direction.
13 . The liquid ejecting head according to claim 12 ,
wherein the first opening rows are located at both ends in the arrangement direction.
14 . A liquid ejecting apparatus comprising:
a liquid ejecting head including an ejection opening row including a plurality of ejection openings configured to eject liquid, a liquid supply path to supply liquid to the plurality of ejection openings, a liquid collection path to collect liquid not ejected through the plurality of ejection openings, energy generation elements configured to generate energy to eject liquid through the ejection openings, a common supply flow path to supply liquid to a plurality of liquid supply paths, a common collection flow path to collect liquid from a plurality of liquid collection paths, and a heating unit configured to heat an ejection region including the ejection openings; and
a circulation system configured to supply liquid from a tank for storing liquid to the liquid ejecting head and transfer liquid collected from the liquid ejecting head to the tank, wherein
on sides of the ejection region with respect to a predetermined direction intersecting an arrangement direction of the ejection openings, a first non-ejection region and a second non-ejection region are provided, with the first non-ejection region being located on a first side and the second non-ejection region being located on a second side,
the ejection region is located so as to be shifted toward the second non-ejection region,
as viewed from a direction orthogonal to a surface having the ejection opening row, there are a first overlap region in which the first non-ejection region and the common collection flow path at least partially overlap each other and a second overlap region in which the second non-ejection region and the common supply flow path at least partially overlap each other, and
an area of the first overlap region is larger than an area of the second overlap region.