LIQUID EJECTION HEAD AND LIQUID EJECTION DEVICE WITH THE SAME

• Main Authors: GENTA SHIN, ISHIMI KEITA, SHIMA TAKAAKI, TAKEKOSHI RIE
• Format: Patent
• Language: English; Japanese
• Published: 25.01.2023
• Subjects: CORRECTION OF TYPOGRAPHICAL ERRORS; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; PERFORMING OPERATIONS; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

To make damage to a projection of an ejection port less likely to occur during cleaning.SOLUTION: A liquid ejection head 2 has an ejection port 3 that ejects liquid, and the ejection port 3 has a plurality of projections 32 projecting toward a center 31 of the ejection port 3. Each of the plurality of projections 32 has a base portion 33, a tip portion 34, and two side portions 35 located between the base portion 33 and the tip portion 34. The plurality of projections 32 have a first projection 32A and a second projection 32B, respective angular positions of the tip portions 34 of which are farthest from each other. If the diameter of the minimum envelope circle 38 of the ejection port 3 is D, the minimum projection interval that is the minimum interval between the first projection 32A and the second projection 32B is d, the distance between two intersections of extension lines 39 of the two side portions 35 of the first projection 32A and the minimum envelope circle 38 is W, and the curvature radius of the base portion 33 of the first projection 32A is R, relations of 0.38≤d/D≤0.57, 0.34≤W/D≤0.51, and 0.0167≤R/D≤0.10 are satisfied.SELECTED DRAWING: Figure 4 【課題】クリーニングの際に吐出口の突起の破損が生じにくくする。【解決手段】液体吐出ヘッド２は、液体を吐出する吐出口３を有し、吐出口３は、当該吐出口３の中心３１に向かって突き出す複数の突起３２を有している。複数の突起３２の各々は、基部３３と、先端部３４と、基部３３と先端部３４との間に位置する２つの側部３５と、を有している。複数の突起３２は、先端部３４の角度位置が互いに最も離れている第１の突起３２Ａと第２の突起３２Ｂとを有している。吐出口３の最小包絡円３８の直径をＤ、第１の突起３２Ａと第２の突起３２Ｂの最小間隔である最小突起間隔をｄ、第１の突起３２Ａの２つの側部３５の延長線３９と最小包絡円３８との２つの交点の間の距離をＷ、第１の突起３２Ａの基部３３の曲率半径をＲとしたときに、０．３８≦ｄ／Ｄ≦０．５７、０．３４≦Ｗ／Ｄ≦０．５１、０．０１６７≦Ｒ／Ｄ≦０．１０の関係が満たされる。【選択図】図４