Patent ID: 6536344
Filing Date: 2003-03-25
Classification: G03F,Y10S

Abstract:
A printing plate automatic exposing device in which a printing plate supplied to a predetermined position on a surface plate is vacuum suction adhered onto the surface plate by air being sucked from a suction hole and a suction groove provided in the surface plate, and in this state, an image is exposed onto the printing plate, said printing plate automatic exposing device comprising:a detection portion, provided independently from the suction hole and the suction groove, at a position on the surface plate which is blocked by printing plates of all dimensions which are set on the surface plate; a suction device communicating with the detection portion and sucking in air from the detection portion; and a pressure sensor communicating with the detection portion, and able to detect that a degree of vacuum of the detection portion is a predetermined degree of vacuum which is set in correspondence with a case in which a printing plate is set on the surface plate.