Liquid discharge head, manufacturing method of liquid discharge head, head cartridge, and liquid discharge apparatus

A liquid discharge head comprising:

• a first liquid flow passage connected to an outlet for discharging discharge liquid;
• a second liquid flow passage which has an element board with a heating element for generating a bubble in bubbling liquid and which corresponds to said first liquid flow passage;
• and
• a movable separation film which substantially and mutually separates said first liquid flow passage and said corresponding second liquid flow passage at all times, further comprising
• a seat to which said movable separation film is physically or chemically joined, wherein said movable separation film is not physically and chemically joined to an end portion on said heating element side of said seat.

A liquid discharge head comprising:

• a plurality of first liquid flow passages connected to outlets for discharging discharge liquid;
• a plurality of second liquid flow passages which have an element board with heating elements for generating a bubble in bubbling liquid and which correspond to said first liquid flow passages;
• and
• a movable separation organic film which substantially and mutually separates said first liquid flow passages and said second liquid flow passages corresponding thereto at all times, further comprising
• a seat to which said movable separation organic film is physically or chemically joined, wherein a tip portion of a flow passage wall provided for dividing said plurality of first liquid flow passages is pressed toward a joining area of said movable separation organic film joined to said seat, and the width W1 of said tip portion is smaller than the width W2 of said joining area.

A liquid discharge head comprising:

• a first liquid flow passage connected to an outlet for discharging discharge liquid;
• a second liquid flow passage which has an element board with a heating element for generating a bubble in bubbling liquid and which corresponds to said first liquid flow passage;
• and
• a movable separation film which substantially and mutually separates said first liquid flow passage and said corresponding second liquid flow passage at all times, further comprising
• a seat to which said movable separation film is joined, wherein said movable separation film is adhered through an adhesive area patterned to said seat.