Abstract: The liquid ejection apparatus comprises: a liquid ejection head having a nozzle which ejects liquid, a pressure chamber which is provided correspondingly to the nozzle, and a pressure measurement device which is provided correspondingly to the pressure chamber and measures pressure in the pressure chamber; a bubble removal device which removes a bubble from the pressure chamber; an error extraction device which extracts an error in capacitance of the pressure measurement device of the pressure chamber from which the bubble has been removed by the bubble removal device; a threshold value setting device which sets a corrected threshold value to be used for determination of pressure abnormality in the pressure chamber, the corrected threshold value having been corrected for the error in the capacitance of the pressure measurement device extracted by the error extraction device; a storage device which stores the corrected threshold value set by the threshold value setting device; and a pressure abnormality determ

Abstract: It is intended to provide a high-speed differential signal cable having a small diameter and high strength. A 4-conductor cable includes four insulation-coated insulated wires (center conductors) bundled together, and a wire mesh and an insulating sheath which cover a periphery thereof, and this cable is characterized in that a conductor size of center conductor wires is thinned so as to satisfy a specified value of attenuation with a cable length of 2.5 m, and also twisted pair wires are replaced by a quad-structure wire, so that the outer diameter is not larger than 3 mm.

Abstract: A foamed-polyolefin-insulated wire having a conductor diameter of 0.4 mm or less and an insulation thickness of 0.8 mm or less and satisfying, an equivalent dielectric constant less than 1.6, the fluctuation limits of the equivalent dielectric constant less than or equal to ±0.1, and conductor stripping force greater than or equal to 100 g/50 mm. Polyolefin including 10 weight % or more of an ionomer is used. Polyolefin having a swelling ratio of 55 % or more is extruded over the conductor to form a foamed insulation layer with a foaming degree of 50 % or more using a chemical foaming agent and/or an inert gas. The wire is suitable for high-speed data transmission.