0.2f/(−f2)0.7;where f2 denotes a focal length of the second lens component, and f denotes a focal length of the projection lens."/>
Projection lens, optical apparatus including projection lens, and method for manufacturing projection lens
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Projection lens, optical apparatus including projection lens, and method for manufacturing projection lens
Projection lens, optical apparatus including projection lens, and method for manufacturing projection lens
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机译：投影镜头，包括投影镜头的光学设备以及制造投影镜头的方法
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摘要
A projection lens PL comprises, in order from a projection side: a first lens component L1 which has positive refractive power and is biconvex; a second lens component L2 which has negative refractive power and is meniscus; and a third lens component L3 which has positive refractive power and has a convex lens surface facing the projection side, lens surfaces on the projection side and an object side of the first lens component L1 and lens surfaces on the projection side and the object side of the second lens component L2 being aspherical, and the following conditional expression being satisfied:0.2f/(−f2)0.7;where f2 denotes a focal length of the second lens component, and f denotes a focal length of the projection lens.
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机译：投影透镜PL从投影侧开始依次包括：具有正屈光力且为双凸的第一透镜成分L 1 。具有负屈光力并且是弯月形的第二透镜组件L 2 。第三透镜组件L 3 具有正屈光力并且具有面对投影侧的凸透镜表面，第一透镜组件L 1在投影侧和物侧的透镜表面。 并且第二透镜组件L 2 的投影侧和物体侧的透镜表面为非球面，并且满足以下条件表达式：<？in-line-formulae description =“在线表达式” end =“ lead”？> 0.2 I> f /（- f 2）<0.7 <？in式中，f2表示第二透镜的焦距，f表示投影透镜的焦距。
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