| 摘要 |
The plate exposing apparatus includes an exposing unit for exposing to light an original plate of a printing plate that does not have an oxygen barrier layer, on which latent image is formed by photo-polymerization based on exposure and which is subjected to alkali development, an oxygen interrupting unit for ensuring that the exposure is performed such that at least an exposed area of the original plate being exposed to light are substantially deprived of oxygen at least during the exposure and an oxygen blocking time control unit for controlling a period of time for which oxygen is interrupted by the oxygen interrupting unit.
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