Hon Hai Precision Industry Co., Ltd.

Premier Image Technology (china) Ltd.

Chang-Qing Wu

Yuan Zhao

Yang-Cheng Luo

An zoom projection lens includes, in this order from the screen-side to the SLM-side thereof, a negative lens group and a positive lens group, and satisfies: &#x2212;2&#x3c;&#x3a6;1/&#x3a6;2&#x3c;&#x2212;0.5, &#x2212;2&#x3c;EFL1/EFL(W)&#x3c;&#x2212;1.5, 1.5&#x3c;EFL2/EFL(W)&#x3c;1.75, &#x2212;1.2&#x3c;EFL1/EFL(T)&#x3c;&#x2212;1, 0.8&#x3c;EFL2/EFL(T)&#x3c;1.2, 0.5&#x3c;EFL(W)/BFL(W)&#x3c;0.6, 0.68&#x3c;EFL(T)/BFL(T)&#x3c;0.75, 6.2&#x3c;TTL(W)/EFL(W)&#x3c;6.5, and 3.5&#x3c;TTL(T)/EFL(T)&#x3c;3.6; where &#x3a6;1 and &#x3a6;2 represent refractive powers of the negative lens group and the positive lens group respectively, EFL(W), EFL(T), EFL1 and EFL2 represent effective focal lengths of the projection lens in a wide-angle state and in a telephoto state, the negative lens group, and the positive lens group respectively, TTL(W) and TTL(T) represent overall lengths of the projection lens in the wide-angle state and in the telephoto state respectively, and BFL(W) and BFL(T) represent rear focal lengths of the projection lens in the wide-angle state and in the telephoto state respectively.

Growing community of inventors

Guangdong, China

Chang-Qing Wu