Projection lens system having magnification changing function and projector
US9678412B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 25, 2013 |
| Grant date | Jun 13, 2017 |
| Priority date | — |
| Expiry date | Jun 9, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2205/0053
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens is a projection lens which is composed of a negative first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, a fifth lens group, and a positive sixth lens group in order from the enlargement conjugate side, and changes magnification by changing the intervals between the lens groups. At least the second, third, and fifth lens groups move when the magnification is changed, and the third lens group moves from the enlargement conjugate side to the reduction conjugate side when the magnification is changed from a telephoto end to a wide angle end. An aperture stop is disposed between the surface closest to the reduction conjugate side of the third lens group and the surface closest to the enlargement conjugate side of the fifth lens group, and is approximately telecentric on the reduction conjugate side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.