Patent ID: 8668301

Claim:
A liquid detection system which detects the presence and non-presence of liquid in a liquid reception unit which receives the liquid comprising: a cavity which is provided between a supply port which supplies the liquid which is received in the liquid reception unit to the outside and the liquid reception unit, the inside of which is filled with the liquid from the liquid reception unit, and at least a part of which is provided with a variable portion which can deform; a pressure reception member which is provided in the inside of the cavity; an urging member which urges the variable portion from the inside of the cavity through the pressure reception member; and a detection unit which detects a change in a position of the pressure reception member which is caused to come into close contact with the variable portion due to the urging member, wherein the pressure reception member is provided with a notch at a surface where the pressure reception member comes into close contact with the urging member, in which the notch extends to the outside of a contact surface from the inside of the contact surface.