Imaging apparatus
US7388715B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2006 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Nov 3, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144515
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
First, second, third and fourth lens groups of a zoom lens portion are arranged on an optical axis in order from an object to be imaged side toward an electronic imaging device. The first lens group has a negative refracting power and a fixed position on the optical axis. The second lens group has a positive refracting power and is moved along the optical axis to effect focusing. The third lens group has a positive refracting power and is moved along the optical axis during a magnification change. The fourth lens group has a fixed position on the optical axis. An angle of incidence of a ray of a maximum image height when the zoom lens portion is in a state at a telephoto end is not greater than the angle of incidence of the ray of the maximum image height incident on the electronic imaging device when the zoom lens portion is in a state at a wide angle end. The angle of incidence of the ray of the maximum image height incident on the electronic imaging device when the zoom lens portion is in the state at the telephoto end is not smaller than 5°.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.