| 摘要 |
PURPOSE:To enhance reliability by performing the stable emission of a liquid droplet from the point of time immediately after the reopening of recording, by supplying a thickening preventing liquid to a liquid flow passage through a semipermeable membrane apart from a recording liquid. CONSTITUTION:A current is supplied to a heat generating element 102 on the basis of a recording signal to heat the same and a recording liquid is emitted from an orifice under the pressure of air bubbles formed in the recording liquid contacted with the heat generating element 102 in a fluid flow passage 106 to perform recording. If there is a non-recording time over a long time, the viscosity of the recording liquid increases by the evaporation of a liquid component from the orifice and, therefore, a thickening preventing liquid is supplied to the recording liquid through a semipermeable membrane 110 to gradually replenish the evaporated part of the recording liquid component and the property of the recording liquid is not especially deteriorated not only at a non-recording time but also at a recording time to enable stable recording. A thickening preventing liquid replenishing port 112 is provided to a thickening preventing liquid chamber 113 and the liquid flow passage 106 is equipped with a thickening preventing liquid supply port 109 for supplying the thickening preventing liquid through the semipermeable membrane 110. |
