| 主权项 |
1. A liquid ejection head for ejecting liquid through the ejection ports having an ejection port forming member forming at least two or more ejection ports, a liquid chamber communicating with the ejection ports are formed so as to correspond to the ejection ports, wherein:
the ejection port forming member has grooves so as to sandwich the ejection ports and the liquid chamber, when assuming that a part of the ejection port forming member forming the ceiling unit of the liquid chamber has a thickness t, the groove has a depth h, the groove has a width s, the width of the liquid chamber in a direction sandwiched by the grooves is denoted by W, and the width between the liquid chamber and the groove has a thickness L, the following relations are satisfied: h/t≧1.0, W/L≧4.7, and W/s≧0.8. |
