| 摘要 |
A flow passage component 10 according to an embodiment of the present invention is a component composed of ceramics, which forms a flow passage (R1-R5) through which a liquid flows. The flow passage has a discharge opening (lower end surface of the flow passage R5), at an end of the flow passage, for discharging the liquid in the flow passage to a space outside of the flow passage component 10. The discharge opening is exposed to the outside space. A flow passage wall surface forming the flow passage is covered by/with a protection film (parylene-film) 20 formed of a paraxylylene-based polymer. Further, the parylene-film 20 is formed so as to have its end at a position upstream of the discharge opening by a predetermined distance D along the flow passage wall surface from the discharge opening. This can decrease a possibility that the liquid goes around the "outer wall surface 11a on which the discharge opening is formed." |
