Ink jet head and printing apparatus

An ink jet head having a plurality of nozzles (120) discharging ink supplied from an ink supply unit (50) comprising:

• a head main body (3) including a plurality of pressure chambers (112), provided one for each of said nozzles (120), in which ink is filled, and a plurality of pressure units (140), provided one for each of said pressure chambers (112), each of said pressure units (140) applying pressure to said pressure chamber (112) to discharge the ink in said pressure chamber (112) from said nozzle (120);
• an individual electrode (109) provided for each of said pressure units (140) to drive said pressure unit (140);
• at least one contact (121) connected to an external connection wiring member (2) supplying a signal for controlling said pressure unit (140);
• a wiring pattern (123) formed into a thin film to electrically connect said individual electrode (109) to said contact (121);
• and
• a joint (8) formed to project from said head main body (3) so that said ink supply unit (50) is mounted to said head main body (3),
• wherein said head main body (3) is formed on a substrate (122), and said joint (8) is formed as a remaining part of said substrate (122) on said head main body (3) by partially removing said substrate (122) from said head main body (3),
• wherein said joint (8) is formed to enclose said individual electrodes (109) on a surface on which said individual electrodes (109), said contacts (121) and said wiring patterns (123) are formed;
• and
• said contacts (121) are disposed outside said joint (8).

An ink jet head having a plurality of nozzles (120) discharging ink supplied from an ink supply unit (50) comprising:

• a head main body (3) including a plurality of pressure chambers (112), provided one for each of said nozzles (120), in which ink is filled, and a plurality of pressure units (140), provided one for each of said pressure chambers (112), each of said pressure units (140) applying pressure to said pressure chamber (112) to discharge the ink in said pressure chamber (112) from said nozzle (120);
• an individual electrode (109) provided for each of said pressure units (140) to drive said pressure unit (140);
• at least one contact (121) connected to an external connection wiring member (2) supplying a signal for controlling said pressure unit (140);
• a wiring pattern (123) formed into a thin film to electrically connect said individual electrode (109) to said contact (121);
• and
• a joint (8) formed to project from said head main body (3) so that said ink supply unit (50) is mounted to said head main body (3),
• wherein said head main body (3) is formed on a substrate (122), and said joint (8) is formed as a remaining part of said substrate (122) on said head main body (3) by partially removing said substrate (122) from said head main body (3),
• wherein said joint (8) is formed to enclose said individual electrodes (109) on a surface on which said individual electrodes (109) are formed, and to project outward from a periphery of said head main body (3);
• and
• said contacts (121) are arranged outside the periphery of said head main body (3) on the side of said joint (8).

A printing apparatus comprising an ink jet head including:

• a plurality of nozzles (120) discharging ink supplied from an ink supply unit (50);
• a head main body (3) including a plurality of pressure chambers (112) provided for said nozzles (120), respectively, in which ink is filled, and a plurality of pressure units (140) provided for said pressure chambers (112), respectively, each of said pressure units (140) applying pressure to said pressure chamber (112) to discharge the ink in said pressure chamber from said nozzle (120);
• an individual electrode (109) provided for each of said pressure units (140) to drive said pressure unit (140);
• a joint (8) formed to enclose said individual electrode (109);
• at least one contact (121) connected to an external connection wiring member (2) supplying a signal for controlling said pressure unit (140), wherein said at least one contact (121) is disposed outside said joint (8);
• and
• a wiring pattern (123) formed into a thin film to electrically connect said individual electrode (109) to said contact (121).

An ink jet head having a plurality of nozzles (120) discharging ink supplied from an ink supply unit (50) comprising:

• a head main body (3) including a plurality of pressure chambers (112), provided one for each of said nozzles (120), in which ink is filled, and a plurality of pressure units (140), provided one for each of said pressure chambers (112), each of said pressure units (140) applying pressure to said pressure chamber (112) from said nozzle (120);
• an individual electrode (109) provided for each of said pressure units (140) to drive said pressure unit (140);
• at least one contact (121) connected to an external connection wiring member (2) supplying a signal for controlling said pressure unit (140);
• a wiring pattern (123) formed into a thin film to electrically connect said individual electrodes (109) to said contact (121);
• and
• a joint (8) formed to project form said head main body (3) so that said ink supply unit (50) is mounted to said head main body (3),
• wherein said joint (8) is formed to enclose said individual electrode (109) on a surface on which said individual electrodes (109) are formed, and to project outward from, and to project outward from a periphery of said head main body (3);
• and
• said contact (121) are arranged outside the periphery of said head main body (3) on the side of said joint.