Substrate for ink-jet head, having an optical element ink-jet head, and ink-jet apparatus

An ink-jet apparatus for performing recording by discharging an ink, comprising:

• an ink-jet head for performing recording by discharging an ink, comprising;
• a discharge port for discharging the ink;
• an ink channel which communicates with said discharge port and is provided with a discharge energy generating element for discharging the ink, and
• a substrate on which said discharge energy generating element is disposed,
• wherein an optical element comprising at least one of a light emitting portion for performing transmission of light and a light receiving portion for performing reception of light is arranged at a position on said substrate corresponding to said ink channel, of said ink-jet head;
• and
• control means for performing at least one of an ink remaining amount detection, an ink density detection, a home position detection, a recording medium presence/absence detection, a head temperature detection, and a recording medium width detection based on an output from said optical element.

A substrate for an ink-jet head, comprising:

• a discharge energy generating element for discharging an ink disposed on said substrate;
• a wiring electrode electrically connected to said discharge energy generating element disposed on said substrate;
• and
• an optical element arranged on said substrate comprising at least one of a light emitting portion for performing transmission of light and a light receiving portion for performing reception of light.