发明名称 投写用広角レンズおよびこれを用いた投写型表示装置
摘要 <p>A first lens group including two aspherical lenses, a second lens group consisting of three negative meniscus lenses, each negative meniscus lens having a convex surface facing the enlargement side, a third lens group having a negative refractive power and including at least one cemented lens, and a fourth lens group having a positive refractive power and including at least two cemented lenses and one aspherical lens are arranged in this order from the enlargement side. Predetermined conditional expressions are satisfied.</p>
申请公布号 JP5814354(B2) 申请公布日期 2015.11.17
申请号 JP20130513925 申请日期 2012.05.07
申请人 发明人
分类号 G02B13/04;G02B13/16;G02B13/18 主分类号 G02B13/04
代理机构 代理人
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