1. Technical Field
The present invention relates to a liquid discharging head and a liquid discharging apparatus.
2. Related Art
An existing liquid discharging head that discharges liquid droplets through nozzles by applying pressure to liquid by pressure generation units such as piezoelectric actuators or heating elements has been known. As a representative example thereof, an ink jet recording head that discharges ink droplets has been disclosed in JP-A-2011-201170, for example.
However, types of ink available are increased with diversified recording modes and there arises the following problem in the liquid discharging head as described in JP-A-2011-201170. That is, there arises the problem that wiping performance on an ink discharge surface is not preferable in a head cleaning operation. To be more specific, for example, when ink having higher viscosity than that of the existing ink is used, ink tends to be accumulated easily in even slight recesses formed on the ink discharge surface of a nozzle plate. Since the ink viscosity is high, ink accumulation cannot be eliminated easily even if ink is wiped out with the existing method in some cases. As a result, the accumulated ink is left and an accumulation amount is increased so that the wiping performance is further deteriorated. This causes solidification of ink on the ink discharge surface or in nozzles, resulting in deterioration of ejected ink performance to be discharged, discharge incapability (discharge deterioration), or the like.
It is to be noted that the above-mentioned problem arises not only on ink but also on other matters that adhere to the ink discharge surface and the same problem occurs for a case where liquid other than ink is discharged.