CPC B41J 2/04535 (2013.01) [B41J 2/04561 (2013.01); B41J 2/0458 (2013.01)] | 20 Claims |
1. A test apparatus comprising a drum configured such that ink drops deposited on a surface of the drum form a printed marking on the surface of the drum, the drum being at least partially transmissive of light;
an ink removal unit configured to remove ink from the surface of the drum;
a light source disposed inside the drum to illuminate the drum; and
a diffuser disposed between the light source and the drum, wherein the diffuser is a cylinder disposed coaxially with the drum.
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