Method of manufacturing a hollow body used in an image forming apparatus
US7891094B2 · kind B2 · utility
2Cited by
10References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2009 |
| Grant date | Feb 22, 2011 |
| Priority date | — |
| Expiry date | Dec 7, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49771
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of manufacturing a hollow body having an external surface randomly provided with a large number of depressions is provided. The method includes providing the large number of depressions on the external surface of the hollow body. A profile curve of the external surface in a circumferential direction is obtained while rotating the hollow body. A frequency analysis is performed on the obtained profile curve. A quality of the hollow body is judged by comparing a result of the frequency analysis with a predetermined judgment standard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.