Liquid cartridge including fixed plate member having light-shielding region and light-transmissive region

Abstract

A liquid cartridge includes a case, a liquid supply portion, a circuit board, a residual-amount detecting portion, a base surface, and a plate member. The residual-amount detecting portion includes an optical access portion accessible by light traveling in a left-right direction. The optical access portion has a portion positioned above and away from electrodes of the circuit board by a first distance in an attached posture. The plate member extends frontward from the base surface, and provides a light-shielding region and a light-transmissive region. The light-shielding region is positioned rearward of the electrodes and frontward of the residual-amount detecting portion. The light-transmissive region is positioned rearward of the light-shielding region and frontward of the residual-amount detecting portion. Each of the light-transmissive region and the light-transmissive region has a portion positioned above and away from the electrodes by the first distance in the attached posture.