| 摘要 |
PROBLEM TO BE SOLVED: To uniformly form a coating film on an image recording material while reducing the cost. SOLUTION: Plural nozzle holes 324 are formed at regular intervals along the longitudinal direction of a nozzle board 322, so that a nozzle column is constituted. Four nozzle columns are arranged on the board 322 in a staggered state. When the diameter of one waterdrop sprayed from each nozzle hole 324 and adhering to a photosensitive material is defined as D, the pitch Pa of nozzle holes with each other inside each nozzle column is defined as the length of (√3).D/2, an interval Pb between nozzle columns is defined as the length of m(√3).Pa /2. Provided that (m) is a value within the range of 0.5<m<1. When the number of the nozzle column is defined as 2n, and also the carrying speed of the photosensitive material is defined as (v); water is sprayed in the cycle of <=Pb .2n/v.
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