Liquid ejection unit and manufacturing method of the same

A liquid ejection unit comprising:

• a print element board including an ejection port configured to eject liquid, an energy generating element configured to generate energy for ejecting the liquid from the ejection port, and an electrode pad electrically connected to the energy generating element;
• an electric wiring board joined to the print element board and including a terminal for electrical connection to the electrode pad;
• an electric connection member including a first connection end portion connected to the electrode pad of the print element board, a second connection end portion connected to the terminal of the electric wiring board, and a link portion configured to link the first connection end portion and the second connection end portion to each other;
• and
• a sealing agent configured to cover an electric connection portion including at least the electric connection member, the electrode pad, and the terminal, wherein
• the electric connection member includes at least one bending point in the link portion,
• the print element board includes a plurality of the energy generating elements and a plurality of the electrode pads, and the energy generating elements and the electrode pads are electrically connected to one another, respectively,
• the electric wiring board includes a plurality of the terminals corresponding to the plurality of electrode pads,
• a plurality of the electric connection members electrically connecting the electrode pads and the terminals to one another, respectively, are provided,
• a maximum height of each of the plurality of electric connection members from an open portion surface of the print element board on which the electrode pads are arranged varies from that of the adjacent electric connection member,
• in two of the electric connection members adjacent to each other, the one with the higher maximum height has a shorter length in the direction of extension of the electrical connection members than that of the other,
• the at least one bending point included in the link portion of the electric connection member includes a first bending point and a second bending point,
• out of the at least one bending point, the first bending point is the closest to the first connection end portion, and the second bending point is the closest to the second connection end portion, and
• the electric connection member includes a horizontal section between the first bending point and the second bending point, the horizontal section being substantially parallel to an open portion surface of the print element board on which the electrode pad is arranged.

A liquid ejection unit comprising:

• a print element board including an ejection port configured to eject liquid, an energy generating element configured to generate energy for ejecting the liquid from the ejection port, and an electrode pad electrically connected to the energy generating element;
• an electric wiring board joined to the print element board and including a terminal for electrical connection to the electrode pad;
• an electric connection member including a first connection end portion connected to the electrode pad of the print element board, a second connection end portion connected to the terminal of the electric wiring board, and a link portion configured to link the first connection end portion and the second connection end portion to each other;
• and
• a sealing agent configured to cover an electric connection portion including at least the electric connection member, the electrode pad, and the terminal, wherein
• the electric connection member includes at least one bending point in the link portion,
• the print element board includes a plurality of the energy generating elements and a plurality of the electrode pads, and the energy generating elements and the electrode pads are electrically connected to one another, respectively,
• the electric wiring board includes a plurality of the terminals corresponding to the plurality of electrode pads,
• a plurality of the electric connection members electrically connecting the electrode pads and the terminals to one another, respectively, are provided,
• a maximum height of each of the plurality of electric connection members from an open portion surface of the print element board on which the electrode pads are arranged varies from that of the adjacent electric connection member,
• in two of the electric connection members adjacent to each other, the one with the higher maximum height has a shorter length in the direction of extension of the electrical connection members than that of the other,
• the at least one bending point included in the link portion of the electric connection member includes a first bending point and a second bending point,
• out of the at least one bending point, the first bending point is the closest to the first connection end portion, and the second bending point is the closest to the second connection end portion, and
• an angle of a segment connecting the second bending point and the second connection end portion of the electric connection member with respect to a surface of the electric wiring board on which the terminal is arranged is between 10 degrees and 90 degrees.

A liquid ejection unit comprising:

• a print element board including an ejection port configured to eject liquid, an energy generating element configured to generate energy for ejecting the liquid from the ejection port, and an electrode pad electrically connected to the energy generating element;
• an electric wiring board joined to the print element board and including a terminal for electrical connection to the electrode pad;
• an electric connection member including a first connection end portion connected to the electrode pad of the print element board, a second connection end portion connected to the terminal of the electric wiring board, and a link portion configured to link the first connection end portion and the second connection end portion to each other;
• and
• a sealing agent configured to cover an electric connection portion including at least the electric connection member, the electrode pad, and the terminal, wherein
• the electric connection member includes at least one bending point in the link portion,
• the print element board includes a plurality of the energy generating elements and a plurality of the electrode pads, and the energy generating elements and the electrode pads are electrically connected to one another, respectively,
• the electric wiring board includes a plurality of the terminals corresponding to the plurality of electrode pads,
• a plurality of the electric connection members electrically connecting the electrode pads and the terminals to one another, respectively, are provided,
• a maximum height of each of the plurality of electric connection members from an open portion surface of the print element board on which the electrode pads are arranged varies from that of the adjacent electric connection member,
• in two of the electric connection members adjacent to each other, the one with the higher maximum height has a shorter length in the direction of extension of the electrical connection members than that of the other,
• a position of the second connection end portion of each of the plurality of the electric connection members is shifted in an extending direction of the electric wiring board, with respect to that of the adjacent electric connection member,
• the electric connection member in which the second connection end portion is separated from the first connection end portion by a distance shorter than a predetermined distance includes at least one bending point in the link portion, and
• the electric connection member in which the second connection end portion is separated from the first connection end portion by a distance longer than the predetermined distance does not include the bending point in the link portion.

A liquid ejection unit comprising:

• a print element board including an ejection port configured to eject liquid, an energy generating element configured to generate energy for ejecting the liquid from the ejection port, and an electrode pad electrically connected to the energy generating element;
• an electric wiring board joined to the print element board and including a terminal for electrical connection to the electrode pad;
• an electric connection member including a first connection end portion connected to the electrode pad of the print element board, a second connection end portion connected to the terminal of the electric wiring board, and a link portion configured to link the first connection end portion and the second connection end portion to each other;
• a sealing agent configured to cover an electric connection portion including at least the electric connection member, the electrode pad, and the terminal;
• and
• at least a second type of an electric connection member including a first connection end portion connected to the electrode pad of the print element board, a second connection end portion connected to the terminal of the electric wiring board, and a link portion configured to link the first connection end portion and the second connection end portion to each other, wherein
• the electric connection member includes at least one bending point in the link portion,
• the print element board includes a plurality of the energy generating elements and a plurality of the electrode pads, and the energy generating elements and the electrode pads are electrically connected to one another, respectively,
• the electric wiring board includes a plurality of the terminals corresponding to the plurality of electrode pads,
• a plurality of the electric connection members electrically connecting the electrode pads and the terminals to one another, respectively, are provided,
• a maximum height of each of the plurality of electric connection members from an open portion surface of the print element board on which the electrode pads are arranged varies from that of the adjacent electric connection member,
• in two of the electric connection members adjacent to each other, the one with the higher maximum height has a shorter length in the direction of extension of the electrical connection members than that of the other,
• a position of the second connection end portion of each of the plurality of the electric connection members is shifted in an extending direction of the electric wiring board, with respect to that of the adjacent electric connection member, and
• the at least the second type of the electric connection member does not include at least one bending point in the link portion.

A liquid ejection unit comprising:

• a print element board including an ejection port configured to eject liquid, an energy generating element configured to generate energy for ejecting the liquid from the ejection port, and an electrode pad electrically connected to the energy generating element;
• an electric wiring board joined to the print element board and including a terminal for electrical connection to the electrode pad;
• an electric connection member including a first connection end portion connected to the electrode pad of the print element board, a second connection end portion connected to the terminal of the electric wiring board, and a link portion configured to link the first connection end portion and the second connection end portion to each other;
• and
• a sealing agent configured to cover an electric connection portion including at least the electric connection member, the electrode pad, and the terminal, wherein
• the electric connection member includes at least one bending point in the link portion,
• the print element board includes a plurality of the energy generating elements and a plurality of the electrode pads, and the energy generating elements and the electrode pads are electrically connected to one another, respectively,
• the electric wiring board includes a plurality of the terminals corresponding to the plurality of electrode pads,
• a plurality of the electric connection members electrically connecting the electrode pads and the terminals to one another, respectively, are provided,
• a maximum height of each of the plurality of electric connection members from an open portion surface of the print element board on which the electrode pads are arranged varies from that of the adjacent electric connection member,
• in two of the electric connection members adjacent to each other, the one with the higher maximum height has a shorter length in the direction of extension of the electrical connection members than that of the other, and
• the electric connection member is plastically deformed at at least one bending point included in the at least one bending point.