Optical system with grating element and imaging device using the same
US6055105A · kind A · utility
11Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1997 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Sep 9, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0037
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system that can be used in an optical imaging system and displays good imaging performance with corrected chromatic aberration without increasing the number of lenses is provided by employing a lens surface with a diffractive effect. The optical system uses a lens with a concave incident surface and positive refractive power. A grating element surface 40 with positive refractive power is formed on at least one surface of the lens. The surface on which the grating element is formed is an aspherical surface with a radius of curvature that becomes bigger with increasing distance from the optical axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.