Zoom projection lens
AssigneeSun Yang Optics Development Co., Ltd.
InventorsYuan Hung SU, Sheng Da JIANG, Yu Hung CHOU, Sheng Che WU
Life of this patent
Estimating the term…
Abstract
A zoom projection lens sequentially comprising: a front fixed lens group, a zoom adjusting lens group, multiple zoom lens groups, and a rear fixed lens group, for satisfying 1<Ft/Fw<2 and 10<OAL/IMH<24, Ft is the focal length at the telephoto end, Fw is the focal length at the wide-angle end, OAL is the distance from the first lens of the lens to the focal plane, and IMH is the half height of the focal plane. Whereby, achieving a zoom projection lens meets the projection requirements of zoom projection and maintain the quality of projection imaging at the same time.
Claims7
A zoom projection lens, from the magnifying side to the narrowing side of the lens sequentially comprising:
- a front fixed lens group, a zoom adjusting lens group, multiple zoom lens groups, and a rear fixed lens group, for satisfying 1<Ft/Fw<2 and 10<OAL/IMH<24, Ft is the focal length at the telephoto end, Fw is the focal length at the wide-angle end, OAL is the distance from the first lens of the lens to the focal plane, and IMH is the half height of the focal plane.
5-6. (canceled)
Dependencies are inferred from the claim text.