| 摘要 |
PURPOSE:To stably obtain a fine latent image pattern, and to easily evaluate a developing process by forming evaluation pattern consisting of a conductive thin film on a dielectric body and obtaining an electrostatic latent image corresponding to the pattern. CONSTITUTION:A dielectric layer 2 is formed on conductive metallic substrate 1 and a thin conductive layer 3 from which a part corresponding to an evaluation pattern is removed is formed on the layer 2. The surface of the layer 3 is uniformly charged by an electrostatic charger 4 and then the charged layer 3 is earthed through a switch 5 or the like to discharge the charge of the layer 3 and to form a stable latent image. The latent image is developed by using the developing device 6 set in the developing condition to be evaluate, and evaluated. Said constitution makes it possible to easily evaluate a developing process by a fine latent image pattern and to improve the reliability of evaluation.
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