Liquid-ejecting recording head and liquid-ejecting recording apparatus

A recording head comprising:

• a plurality of discharging port groups separately provided so as to correspond to kinds of recording liquids to be discharged;
• a plurality of common liquid chambers from which the recording liquids are supplied to the discharging port groups;
• a plurality of recording-liquid introducing passages communicating with the common liquid chambers;
• and
• a plurality of porous members provided in the recording-liquid introducing passages and configured to trap dust and a bubble in the recording liquids,
• wherein upstream aperture areas of the porous members are equal to each other, and downstream aperture areas of the porous members are different according to a relative difference in flow resistance between recording-liquid flow passages extending from the porous members to the discharging port groups communicating with the porous members.

A recording head comprising:

• a first discharging port group including a plurality of first discharging ports configured to discharge a first recording liquid, the first discharging ports being arranged in an array;
• a second discharging port group including a plurality of second discharging ports configured to discharge a second recording liquid, the second discharging ports being arranged in arrays so that the first discharging port group is provided between the arrays of the second discharging ports;
• a first recording-liquid introducing passage through which the first recording liquid is supplied to the first discharging port group;
• a second recording-liquid introducing passage through which the second recording liquid is supplied to the second discharging port group;
• and
• a plurality of porous members provided in the first and second recording-liquid introducing passages and configured to trap dust and a bubble in the first and second recording liquids,
• wherein the number of second discharging ports is more than the number of first discharging ports,
• wherein upstream aperture areas of the porous members provided in the first and second recording-liquid introducing passages are equal to each other, and
• wherein a downstream aperture area of the porous member provided in the first recording-liquid introducing passage is smaller than a downstream aperture area of the porous member provided in the second recording-liquid introducing passage.

A recording head comprising:

• a first discharging port group including a plurality of first discharging ports configured to discharge a first recording liquid, the first discharging ports having the same size;
• a second discharging port group including the same number of second discharging ports as the number of first discharging ports, the second discharging ports including discharging ports smaller than the first discharging ports;
• a first recording-liquid introducing passage through which the first recording liquid is supplied to the first discharging port group;
• a second recording-liquid introducing passage through which a second recording liquid is supplied to the second discharging port group;
• and
• a plurality of porous members provided in the first and second recording-liquid introducing passages and configured to trap dust and a bubble in the recording liquids,
• wherein upstream aperture areas of the porous members in the first and second recording-liquid introducing passages are equal to each other, and
• wherein a downstream aperture area of the porous member provided in the first recording-liquid introducing passage is smaller than a downstream aperture area of the porous member provided in the second recording-liquid introducing passage.

A recording head comprising:

• a plurality of discharging port groups each including a plurality of discharging ports configured to discharge recording liquid;
• a plurality of recording-liquid flow passages through which the recording liquid is supplied to the discharging port groups;
• and
• a plurality of filters provided at entrances of the recording-liquid flow passages, the filters having the same size,
• wherein downstream cross-sectional areas of the filters provided at the entrances of the recording-liquid flow passages are different according to flow resistances in the recording-liquid flow passages.