Liquid Discharge Head and Liquid Discharge Apparatus

A liquid discharge head comprising:

• a channel unit including:
• a first individual channel group including a plurality of first individual channels;
• a second individual channel group including a plurality of second individual channels;
• four manifolds including two supply manifolds corresponding to the first individual channel group and the second individual channel group respectively, and two return manifolds corresponding to the first individual channel group and the second individual channel group respectively, the two supply manifolds being configured to supply a liquid to the plurality of first individual channels and the plurality of second individual channels, and the two return manifolds being configured to outflow the liquid from the two supply manifolds;
• and
• a bypass channel communicating with the two supply manifolds or with the two return manifolds, without passing through the plurality of first individual channels or the plurality of second individual channels,
• wherein a relationship of |P1|>|P2| is satisfied, wherein P1 is a first pressure of the supply manifold provided commonly for the first individual channel group, P2 is a second pressure of the supply manifold provided commonly for the second individual channel group, −P1 is a third pressure of the return manifold provided commonly for the first individual channel group, and −P2 is a fourth pressure of the return manifold provided commonly for the second individual channel group.