| 摘要 |
Time T (ms) required for an ink droplet ejected onto a recording medium to be absorbed completely by the recording medium is represented by: T=(4V/piD2Ka)2, where V represents a maximum amount (ml) of the ink droplet ejected from the recording head in a single operation, D represents an average diameter (m) of an equivalent circular area of the dot when the ink droplet impinges on the recording medium, and Ka represents an ink absorption coefficient (ml/m2 .ms½) of the recording medium. The conditions of T, V, D and Ka are set to meet the relationship T<=Tx (ms), where Tx represents the time between a step for a first ink droplet to impinge on a certain position of the recording medium and another step for a second ink droplet to impinge on the same position of the recording medium. In other words, T, V, D and Ka are set to meet the relationship: 4V/piD2Ka)2<Tx.
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