Title:
ZOOM LENS FOR PROJECTION
Document Type and Number:
WIPO Patent Application WO/2023/005244
Kind Code:
A1
Abstract:
A zoom lens for projection, wherein a first lens set (G1) is configured to diverge an incident light ray, a second lens set (G2) is configured to adjust a propagation angle of the incident light ray, a third lens set (G3) is configured to adjust an aperture of a light beam, and a stop (ST) is located between the third lens set (G3) and a fourth lens set (G4). The stop (ST) can move along with the fourth lens set (G4) along an optical axis, and the relative position between the stop (ST) and the fourth lens set (G4) does not change. In a zooming process, the stop (ST) can move along with the fourth lens set, such that a clear aperture of the lens tends to be constant during the zooming process, and thus, the brightness of an image picture tends to be constant during the zooming process. By optimally designing the number of lenses of each lens set, the surface shape of each lens and various optical parameters of each lens, the zoom lens can meet the application requirements of having a high imaging quality, a compact and miniaturized structure and low costs.
More Like This:
| JPH08271786 | ZOOM TYPE OPTICAL MICROSCOPE |
| JPS61260209 | ZOOM LENS |
Inventors:
CHEN YIXUE (CN)
YIN LEI (CN)
GE RUI (CN)
YIN LEI (CN)
GE RUI (CN)
Application Number:
PCT/CN2022/083348
Publication Date:
February 02, 2023
Filing Date:
March 28, 2022
Export Citation:
Assignee:
CHENGDU XGIMI TECH CO LTD (CN)
International Classes:
G02B15/14; G02B13/00; G02B13/18
Foreign References:
| CN113341550A | 2021-09-03 | |||
| CN101806953A | 2010-08-18 | |||
| EP2108989A1 | 2009-10-14 | |||
| CN101344635A | 2009-01-14 | |||
| US20070121214A1 | 2007-05-31 | |||
| US20060056043A1 | 2006-03-16 |
Download PDF: