Liquid ejecting head, substrate for liquid ejecting head, and printing apparatus

A substrate for liquid ejecting head comprising:

• a plurality of heat generating resistor elements that can generate heat;
• a plurality of protective members that are located at positions corresponding to the heat generating resistor elements, to protect the heat generating resistor elements, and further, can be eluted into the liquid with the application of a voltage;
• and
• a protective member eluting unit that can select a predetermined protective member out of the plurality of protective members and can apply a voltage to the predetermined protective member.

A printing apparatus comprising:

• a liquid ejecting head including:
• a plurality of pressure chambers that can store liquid therein;
• heat generating resistor elements that are arranged in a manner corresponding to each of the pressure chambers, and can heat the liquid stored in the pressure chambers;
• a plurality of ejection ports, through which the liquid is ejected by heat generated by the drive of the heat generating resistor elements;
• and
• a plurality of protective members that are located at positions corresponding to the heat generating resistor elements to protect the heat generating resistor elements, and further, can be eluted into the liquid with the application of a voltage in a state in which the liquid is stored in the pressure chambers;
• a voltage applying unit configured to apply a voltage to the protective members;
• and
• a protective member eluting unit that can select a predetermined one out of the plurality of protective members and can apply a voltage to the predetermined protective member.