Liquid jetting device having a mechanism for introducing a bubble into a liquid chamber and recording apparatus using the device

A recording head for ejecting ink, comprising:

• an ejection hole through which ink is ejected;
• an ejection energy application section communicating with said ejection hole and for applying ejection energy to ink to eject ink;
• an ink reservoir section communicating with said ejection energy application section and containing ink to be supplied to said application section;
• and
• air bubble formation means for making an air bubble exist in said ink reservoir section before recording, the air bubble being formed by heating.

An ink-jet recording apparatus for effecting recording by ejecting ink, said apparatus comprising:

• a recording head having an ejection hole through which ink is ejected, a liquid passage communicating with said ejection hole and having an electrothermal conversion member for generating thermal energy to form an air bubble for ejecting ink, and a liquid chamber communicating with said liquid passage and containing ink to be supplied to said liquid passage when ink is ejected;
• driving means for driving said electrothermal conversion member to generate thermal energy;
• and
• air bubble introduction means for controlling said driving means to reheat the air bubble formed by said electrothermal conversion member so that a bubble not acting to eject ink is formed in said liquid chamber.

An ink jet recording apparatus for effecting recording by ejecting ink onto a recording medium, said apparatus comprising:

• a recording head having an ejection hole through which ink is ejected, a liquid passage communicating with said ejection hole and having a thermal energy generation section for generating thermal energy to form an air bubble for ejecting ink, and a liquid chamber communicating with said liquid passage and containing ink to be supplied to said liquid passage when ink is ejected;
• driving means for generating thermal energy in said thermal energy generation section;
• and
• control means for controlling said driving means to generate in said thermal energy generation section a fine air bubble which does not act to eject ink, and for thereafter growing an air bubble from a nucleus formed of said fine air bubble.

An ink jet recording apparatus for effecting recording by ejecting ink onto a recording medium, said apparatus comprising:

• a recording head having an ejection hole through which ink is ejected, a liquid passage communicating with said ejection hole and having a thermal energy generation section for generating thermal energy to form an air bubble for ejecting ink, and a liquid chamber communicating with said liquid passage and containing ink to be supplied to said liquid passage when ink is ejected;
• driving means for generating thermal energy in said thermal energy generation section;
• control means for controlling said driving means to generate in said thermal energy generation section an air bubble which does not act to eject ink;
• and
• ejection recovery means for discharging ink through said ejection hole to suitably maintain the state of ink ejection from said ejection hole, said ejection recovery means discharging ink at a smaller discharge rate or by smaller discharge power in comparison with the discharging for suitably maintaining the state of ink ejection, when an air bubble not acting to eject ink is formed by said control means.

An ink jet recording apparatus for effecting recording by ejecting ink onto a recording medium, said apparatus comprising:

• a recording head having an ejection hole through which ink is ejected, a first liquid passage communicating with said ejection hole and having a thermal energy generation section for generating thermal energy to form an air bubble for ejecting ink, a second liquid passage provided at least one side of said first liquid passage and having a thermal energy generation section for generating thermal energy, and a liquid chamber communicating with said first and second liquid passages and containing ink to be supplied to said first and second liquid passages when ink is ejected;
• driving means for generating thermal energy in said thermal energy generation sections of said first and second liquid passages;
• and
• control means for controlling said driving means to generate an air bubble which does not act to eject ink in said thermal energy generation section of said second liquid passage.