US 12,030,311 B2
Test apparatus
Dave Moule, Shropshire (GB); and Mark Smith, Shropshire (GB)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Appl. No. 17/759,205
Filed by Dave Moule, Shropshire (GB); and Mark Smith, Shropshire (GB)
PCT Filed Feb. 16, 2021, PCT No. PCT/JP2021/005589
§ 371(c)(1), (2) Date Jul. 21, 2022,
PCT Pub. No. WO2021/166867, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 2002208 (GB), filed on Feb. 18, 2020.
Prior Publication US 2023/0081122 A1, Mar. 16, 2023
Int. Cl. B41J 2/165 (2006.01); B41J 2/045 (2006.01)
CPC B41J 2/04535 (2013.01) [B41J 2/04561 (2013.01); B41J 2/0458 (2013.01)] 20 Claims
OG exemplary drawing
 
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.