Smoothness measuring device and recording apparatus to which the smoothness measuring device is applied
US5109236A · kind A · utility
37Cited by
5References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1989 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Aug 25, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/303
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A smoothness measuring device for measuring the smoothness of a surface to be measured has a light source for applying a light to the surface to be measured from an oblique direction thereto, a first detector for detecting the quantity light from the light source being reflected by the surface to be measured, a second detector for detecting the quantity of light from the light source being reflected by the surface to be measured, and a judging circuit for judging the smoothness of the surface to be measured on the basis of the results of the first and second detectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.