Ink jet printing head and printing apparatus using same

An ink jet printing apparatus comprising:

• an ink jet print head including ink ejection outlets for ejecting ink;
• passages communicating with said ejection outlets;
• a common chamber for supplying the ink to said passages;
• ejection energy generating elements for producing energy for ejecting the ink;
• and an ink supply passage for supplying the ink to said common chamber;
• an impedance changing means for attenuating vibration of the ink, disposed at a position through which a pressure wave resulting from driving of said ejection energy generating elements propagates the vibration of the ink;
• and
• driving signal supply means for supplying a driving signal for driving said ejecting energy generating elements.

A liquid jet apparatus comprising:

• liquid ejection outlets for ejecting liquid;
• passages communicating with said liquid ejection outlets;
• a common chamber for supplying the liquid to said passages;
• ejection energy generating elements for producing energy for ejecting the liquid;
• a liquid supply passage for supplying the liquid to said common chamber;
• and
• an impedance changing means for attenuating vibration of the liquid, disposed at a position of said liquid supply passage.