Ink jet recording apparatus and ink jet recording head

An ink jet recording apparatus capable of selectively mounting a first head provided with plural discharge ports for discharging ink, plural ink flow paths respectively communicating with said plural discharge ports, and at least two heat generating elements provided in each of said ink flow paths along the direction thereof and adapted to discharge pigment-based ink of a desired color, or a second head having a structure same as that of the first head and adapted to discharge dye-based ink of a color same as that of said pigment-based ink, wherein said ink jet recording apparatus comprises ID recognition means for recognizing an ID provided on each head, and a ROM including a supply timing table, for each ID, for the drive signals for the ink discharge by said plural heat generating elements, and the supply timing table of the ROM is selected according to the ID recognized by said recognition means to vary the supply timings of the drive signals for ink discharge by said plural heat generating elements in each head according to the kind of the ink thereby discharging ink droplets of a substantially constant amount in each head.

An ink jet recording head provided with plural discharge ports for discharging ink, plural ink flow paths respectively communicating with said discharge ports, and at least two heat generating elements provided in each of said ink flow paths along the direction thereof, comprising:

• a ROM having a supply timing table for the drive signals for the ink discharge by said plural heat generating elements for compensating the change in physical properties of said ink depending on the head temperature;
• wherein the supply timings of the drive signals for ink discharge by said plural heat generating elements are varied according to the head temperature based on said supply timing table thereby discharging ink droplets of a substantially constant amount.

An ink jet recording head provided with plural discharge ports for discharging ink, a discharge port forming member provided with said plural discharge ports, plural ink flow paths respectively communicating with said plural discharge ports, and a heat generating element provided in each of said ink flow paths, the plural ink flow paths including an ink flow path in which ink of a different color is supplied;

• wherein said discharge port forming member has different thicknesses for the discharge ports for the inks of different colors and has a boundary portion between the discharge ports for discharging the inks of the different colors, and the thickness of the discharge port forming member is changed at said boundary portion.

An ink jet recording head provided with plural discharge ports for discharging ink, a discharge port forming member provided with said plural discharge ports, plural ink flow paths respectively communicating with said plural discharge ports, and at least two heat generating elements provided in each of said ink flow paths along the direction thereof, said plural ink flow paths including an ink flow path in which ink of a different color is supplied and the discharge amount being different for each color of the ink discharged by said ink jet recording head;

• wherein said ink flow paths have a same length and a same height but are different in at least one of the heat generating element, the width of the ink flow path and the thickness of the discharge port forming member for each color of the ink to be discharged, thereby attaining a desired discharge amount for each color of the ink to be discharged.