Lens barrel part, lens assembly, imaging device, and lens barrel part manufacturing method
US8520330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2011 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | May 2, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/55
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided are a lens barrel part and a method of producing the same, such that the generation of grinding debris due to friction with lenses is suppressed while maintaining the air permeability of porous ceramics. Those areas of a lens barrel part 1 which are in contact with the lenses are ground in the water by a polishing tool 25, with the result that in those regions of surfaces in contact with the lenses where fine projections exist, protection film portions 28 consisting of hydrates or oxides are created due to the generation of tribochemical reactions, and that in those regions of surfaces in contact with the lenses which are other than the regions where fine projections are present, there exist porous portions 29 where no tribochemical reaction occurs and where a porous state remains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.