Jet hole plate, liquid jet head, liquid jet recording apparatus, and method for manufacturing jet hole plate
Provided herein are a jet hole plate, a liquid jet head, a liquid jet recording apparatus, and a method for manufacturing a jet hole plate that can achieve a long life. A jet hole plate according to an embodiment of the present disclosure is a jet hole plate for use in a liquid jet head. The jet hole plate includes a metal substrate having provided therein a plurality of jet holes. The metal substrate has a principal surface having outlets for the jet holes. The principal surface has a surface roughness (arithmetic mean roughness Ra) that is smaller in outlet edge regions of the jet holes than in surrounding regions around the outlet edge regions.
1. A jet hole plate for use in an liquid jet head,
the jet hole plate comprising a metal substrate provided with a plurality of jet holes,
the metal substrate having a principal surface provided with outlets of the jet holes,
wherein, on the principal surface, a surface roughness (arithmetic mean roughness Ra) of outlet edge regions of the jet holes is smaller than that in surrounding regions around the outlet edge regions,
wherein the outlet edge regions have a circular ring shape and the outer diameter of the outlet edge regions are larger than a pitch of the jet holes, and
wherein each of the outlet edge regions omnidirectionally extends around the respective jet holes.
2. The jet hole plate according to claim 1 , wherein the outlet edge regions represent a polished surface formed by mechanical polishing.
3. The jet hole plate according to claim 1 , wherein:
the jet holes are formed in a line on the principal surface, and
the outlet edge regions are in contact with each other between adjacent outlet edge regions.
4. The jet hole plate according to claim 1 , further comprising a liquid repellent film that is in contact with the principal surface either directly or via an adhesive layer.
5. A liquid jet head comprising the jet hole plate according to claim 1 .
6. A liquid jet recording apparatus comprising:
the liquid jet head according to claim 5 ; and
a container for storing liquid to be supplied to the liquid jet head.
7. A method for manufacturing a jet hole plate,
the method comprising:
a punching step of pressing a first principal surface of a metal substrate with one or more punches to form a plurality of indentations in the first principal surface, and to form raised portions in a second principal surface of the metal substrate in positions opposite the indentations; and
a polishing step of removing the raised portions by mechanical polishing to penetrate the metal substrate at the indentations to thereby form a plurality of jet holes, so that a surface roughness (arithmetic mean roughness Ra) of polished surfaces forming outlet edge regions of the jet holes is smaller than that in surrounding regions around the polished surfaces,
wherein the outlet edge regions have a circular ring shape and the outer diameter of the outlet edge regions are larger than a pitch of the jet holes, and
wherein each of the outlet edge regions omnidirectionally extends around the respective jet holes.
8. The method according to claim 7 , wherein:
in the punching step, the plurality of indentations is formed in a line, and
in the polishing step, the raised portions are polished so as to form the plurality of jet holes in a line, and to bring the polished surfaces into contact with each other between adjacent polished surfaces.
9. The method according to claim 7 , which further comprises a film forming step of forming a liquid repellent film that contacts the second principal surface either directly or via an adhesive layer.