Printhead assembly with heat sink for drive circuitry

1. A printhead assembly comprising:

at least two printhead integrated circuits (IC's) having arrays of printing fluid ejection nozzles;

a support member for supporting and carrying the printing fluid for the at least two printhead integrated circuits;

drive circuitry for controlling the operation of the printhead IC's;

an electrical connector for connecting the drive circuitry to the at least two printhead integrated circuits; and,

a casing for supporting the printhead IC's, the support member, the drive circuitry and the electrical connector within an inkjet printer; wherein,

the casing has a heat sink to draw heat away from the drive circuitry.

2. A printhead assembly according to claim 1 wherein the casing has a cover that is removable to allow access to the print engine controller, the heat sink being provided on the cover.

3. A printhead assembly according to claim 2 wherein the cover and the heat sink are integrally formed.

4. A printhead assembly according to claim 3 wherein the heat sink is a series of cooling fins extending from an interior surface of the cover toward the drive circuitry.

5. A printhead assembly according to claim 4 wherein the drive circuitry is provided on a printed circuit board.

6. A printhead assembly according to claim 5 wherein the casing has an interface with electrical contacts for receiving print data from a print engine controller in the inkjet printer.

7. A printhead assembly according to claim 6 wherein the printed circuit board has complementary contacts for electrical connection to the electrical contacts in the interface.

8. A printhead assembly according to claim 7 wherein the casing has a set of printing fluid inlets for receiving printing fluid from a supply within the inkjet printer.