Fluid jet head with driving circuit of a heater set

A fluid jet head, comprising:

• a heater set, having a plurality of heaters arranged in an matrix of M rows by N columns, wherein the heater of the ith row and the jth column is heater (i, j), the heater of the ith row and the kth column is heater (i, k), wherein M, N, i, j, k are whole numbers, i is less than M or equal to M, j is less than N or equal to N, and j does not equal to k;
• and
• a driver circuit, comprising:
• a plurality of current paths, each of the heaters corresponding and electrically connecting to one of the current paths, the current paths comprising a current path (i, j) and a current path (i, k);
• a bias-voltage-selecting unit, for outputting N control voltages, comprising a jth control voltage and a kth control voltage, and
• M×N primary transistors, comprising:
• a primary transistor (i, j), electrically connected to the heater (i, j), the resistance of the primary transistor (i, j) being equivalent to a primary transistor equivalent resistance (i, j) when the primary transistor (i, j) is turned on under the control of the jth control voltage, and when a current (i, j) is generated and flows through the heater (i, j), the primary transistor (i, j) and the current path (i, j);
• and
• a primary transistor (i, k), electrically connected to the heater (i, k), the resistance of the primary transistor (i, k) being equivalent to a primary transistor equivalent resistance (i, k) when the primary transistor (i, k) is turned on under the control of the kth control voltage, and when a current (i, k) is generated and flows through the heater (i, k), the primary transistor (i, k), and the current path (i, k);
• wherein the primary transistor equivalent resistance (i, j) and the primary transistor equivalent resistance (i, k) respectively correspond to the jth control voltage and the kth control voltage, thereby causing the thermal energy generated by the heater (i, j) and heater (i, k) to substantially equal each other.

A circuit for driving a heater set, the heater set comprising a first heater and a second heater, the circuit comprising:

• a bias-voltage-selecting unit, for outputting a first control voltage and a second control voltage;
• a first primary transistor, electrically connected in series to the first heater and a first current path, having a first primary transistor equivalent resistance when the first primary transistor being turned on by applying the first control voltage, and allowing a first current flow through the first heater, the first primary transistor, and the first current path;
• and
• a second primary transistor, electrically connected in series to the second heater and a second current path, having a second primary transistor equivalent resistance when the second primary transistor being turned on by applying the second control voltage, and allowing a second current flow through the second heater, the second primary transistor, and the second current path, the second current path being longer than the first current path;
• wherein the first primary transistor equivalent resistance and the second primary transistor equivalent resistance are adjusted through controlling the first control voltage and the second control voltage, respectively, thereby changing the magnitudes of the first current and the second current paths and causing the thermal energy generated by the first and second heaters to be substantially equal.