| 摘要 |
Method for producing positive images by irradiating photoimageable and photodeactivatable compositions which are characterized by forming color on irradiation with light in a first wavelength range and by being deactivated against color formation on irradiation with light in a different second wavelength range. The method comprises simultaneously exposing such composition disposed as an image-capture surface to radiations in both wavelength ranges, with 1. THE DEACTIVATING RADIATION BEING APPLIED PATTERNWISE ACCORDING TO THE DESIRED IMAGE TO BE CAPTURED, 2. THE COLOR-FORMING RADIATION BEING APPLIED OVER THE ENTIRE SURFACE TO BE IMAGED, AND 3. THE INTENSITIES AND THE RELATIVE INTENSITIES OF THE TWO RADIATIONS BEING SUCH THAT I. THE DEACTIVATING RADIATION IS ITSELF EFFECTIVE FOR DEACTIVATION AND II. THE COLOR-FORMING RADIATION IS ITSELF EFFECTIVE TO CAUSE COLOR FORMATION IN OTHER THAN THE CO-STRUCK AREAS BUT IS INEFFECTIVE IN THE PRESENCE OF THE DEACTIVATING RADIATION IN THE CO-STRUCK AREAS TO CAUSE SUBSTANTIAL COLOR FORMATION.
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