Image blur compensating telephotographic lens
US5121978A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 1989 |
| Grant date | Jun 16, 1992 |
| Priority date | — |
| Expiry date | Nov 17, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image blur compensating telephotographic lens has four lens groups. The four lens groups comprise a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens group having a negative power arranged in this order from an object side. In one embodiment, the telephotographic lens has a lens moving mechanism for moving the second lens group in a direction vertical to the optical axis in order to compensate for an image blur when a photograph is taken. In another embodiment, the telephotographic lens has a lens moving mechanism for moving the third lens group in a direction vertical to the optical axis in order to compensate for an image blur when a photograph is taken.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.