Assistance device, design assistance method and recording medium for liquid ejection device, method of manufacturing liquid ejection device, and image recording device

A design assistance device for a liquid ejection device that satisfies a predetermined relationship and that includes a liquid ejection head provided with a nozzle for ejecting liquid;

• a liquid supply flow channel configured to supply the liquid to the liquid ejection head;
• and a liquid pressure applying unit configured to apply pressure to the liquid in the liquid supply flow channel through a pressure absorber, the design assistance device comprising:
• an acquisition unit configured to acquire a pulsation frequency fp of the liquid pressure applying unit, a compliance capacity C of the pressure absorber, and a composite inertance L of the liquid ejection head and the liquid supply flow channel;
• a determination unit configured to determine whether a relationship between a cutoff frequency fc expressed by fc=1/(2π(LC)0.5) using the acquired C and L, and the pulsation frequency fp satisfies the predetermined relationship that satisfies fp≧fc;
• and
• an output unit configured to output a determination result of the determination unit.

A method of manufacturing a liquid ejection device that satisfies a predetermined relationship and that includes a liquid ejection head provided with a nozzle for ejecting liquid;

• a liquid supply flow channel configured to supply the liquid to the liquid ejection head;
• and a liquid pressure applying unit configured to apply pressure to the liquid in the liquid supply flow channel through a pressure absorber, the method comprising:
• an acquiring step of acquiring a pulsation frequency fp of the liquid pressure applying unit, a compliance capacity C of the pressure absorber, and a composite inertance L of the liquid ejection head and the liquid supply flow channel;
• a determining step of determining whether a relationship between a cutoff frequency fc expressed by fc=1/(2π(LC)0.5) using the acquired C and L, and the pulsation frequency fp satisfies the predetermined relationship that satisfies fp≧fc, outputting the fp, the C, and the L, if it is determined that the predetermined relationship is satisfied, and calculating and outputting a value satisfying the predetermined relationship for at least one of the fc, the C, and the L if it is determined that the predetermined relationship is not satisfied;
• and
• a designing step of designing the liquid ejection device based on the output fc, C, and L.