| http://www.w3.org/ns/prov#value | - The removing means 82 is implemented, as shown in FIG. 3, an ultrasonic irradiation part that irradiates the ultrasonic wave to the pixels in the pattern generating means 20, a liquid dropping unit that drops a cleanser onto the pixels in the pattern generating means 20, or an injector that injects dry gas, such as nitrogen and dry air.
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