Image forming method and image exposure device

摘要

Forming an image on a planographic printing plate precursor comprising a substrate and an image-recording layer, includes exposing planographic printing plate precursor to infrared radiation to form an image on the image-recording layer, and post-heating the planographic printing plate precursor to a predetermined heating temperature. The image-recording layer comprises hydrophobic precursor and light-to-heat converting agent. An independent claim is also included for an image-exposure device comprising a retention member to which the planographic printing plate precursor can be attached and for retaining the attached planographic printing plate precursor, a mechanism for exposing the planographic printing plate precursor to infrared radiation, and a mechanism for post-heating the planographic printing plate precursor which has been detached from the retention member after image formation to the heating temperature by thermal energy or electromagnetic energy supplied from a heat-supplying portion extending linearly.