US 10,889,113 B2
Recording element board, liquid ejection apparatus and method of manufacturing recording element board
Ryoji Oohashi, Yokohama (JP); Tsubasa Funabashi, Yokohama (JP); Koichi Omata, Kawasaki (JP); Hideo Tamura, Kawasaki (JP); Kousuke Kubo, Kawasaki (JP); and Yohei Osuki, Nagareyama (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jul. 8, 2019, as Appl. No. 16/505,512.
Claims priority of application No. 2018-131489 (JP), filed on Jul. 11, 2018.
Prior Publication US 2020/0016896 A1, Jan. 16, 2020
Int. Cl. B41J 2/16 (2006.01); B41J 2/14 (2006.01)
CPC B41J 2/14129 (2013.01) [B41J 2/1601 (2013.01); B41J 2/1628 (2013.01); B41J 2/1631 (2013.01); B41J 2/1603 (2013.01); B41J 2/1642 (2013.01); B41J 2/1646 (2013.01); B41J 2202/18 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A recording element board having a plurality of heat-generating resistor elements arranged in a row, each of the plurality of heat-generating resistor elements comprising:
a heat-generating resistor layer to be electrically powered for generating heat to energize liquid contained in a pressure chamber to be arranged beside the heat-generating resistor layer in order to cause the pressure chamber to eject the liquid therefrom;
at least a pair of first electrodes formed as vias connected to a surface of the heat-generating resistor layer at a side opposite to the pressure chamber, the pair of first electrodes feeding electrical power to a first part of the heat-generating resistor layer to form a first heat-generating region between the pair of first electrodes; and
at least a pair of second electrodes connected to the surface of the heat-generating resistor layer at a side facing the pressure chamber, the pair of second electrodes feeding electrical power to a second part of the heat-generating resistor layer to form a second heat-generating region between the pair of second electrodes, wherein surfaces of the pair of second electrodes located at the side facing the pressure chamber being inclined so as to gradually reduce the thickness thereof toward respective ends thereof,
wherein each of the heat-generating resistor elements has a common electrode connected to the heat-generating resistor layer so as to be commonly used both when the first heat-generating region is formed and when the second heat-generating region is formed; and
wherein the common electrode is formed as a via and arranged between the pair of first electrodes in a plan view of the recording element board.