System and method for measuring accuracy of focus
US8988530B2 · kind B2 · utility
2Cited by
3References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2012 |
| Grant date | Mar 24, 2015 |
| Priority date | — |
| Expiry date | Feb 25, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A reliable and repeatable accuracy of focus measurement device to measure the focus accuracy of cameras. The measurement device includes a frame having a substantially planar front face with a focusing target located thereon, and at least one depth-of-field ruler coupled to the frame with a transverse axis falling within a front face plane and a long axis that is angularly adjustable with respect to the front face plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.