Patent ID: 8191995

Claim:
A printhead for thermal inkjet printing, comprising: a substrate having a plurality of orifices with a firing element in each of said plurality of orifices, wherein said plurality of orifices are arranged in a single column, said plurality of firing elements are classified into a first number of groups, and each group comprises: a second number of firing elements, wherein said second number of firing elements in a group are arranged such that each of said second number of firing elements is energized at a different time, and the time difference for energizing any two adjacent firing elements is at least two predetermined time intervals, and are located such that two sequentially fired firing elements are separated by at least two other firing elements, and a firing circuit for energizing said plurality of firing elements to eject ink on a printing medium by respectively transmitting a plurality of firing signals to said plurality of firing elements; wherein said printhead is disposed at an angle to a horizontal direction along which said printhead scans, and said angle is substantially not equal to 90 degrees.