Patent ID: 8068237
Filing Date: 2011-11-29
Classification: B41J,G01N,G03G

Abstract:
1. A sheet-type detection device, comprising: a light source configured to emit light at a recording sheet; a line sensor including a plurality of light-receiving elements arranged along a direction intersecting a direction to convey the recording sheet, each element of the plurality of light-receiving elements configured to detect light transmitted through the recording sheet, some of the plurality of light-receiving elements configured to function as a first detection unit, and others of the plurality of light-receiving elements configured to function as a second detection unit, the first detection unit configured to detect transmitted light being unfocused and the second detection unit configured to detect transmitted light being focused at a higher resolution than the first detection unit; and a determining unit configured to determine a thickness of the recording sheet based on an output from the first detection unit, and determining a surface roughness of the recording sheet based on an output from the second detection unit.