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发明授权
CN101861541B 广角光学系统、摄像镜头装置、监视照相机及数码器械 有权 转让 许可

广角光学系统、摄像镜头装置、监视照相机及数码器械
摘要：
本发明涉及广角光学系统、摄像镜头装置、监视照相机及数码器械。本发明提供一种具有更良好光学性能且低成本小型的广角光学系统和备有该广角光学系统的摄像镜头装置、监视照相机及数码器械。本发明的广角光学系统1从物体侧向像侧依次由具有负的光学倍率的第1透镜11、具有负的光学倍率的第2透镜12、具有正的光学倍率的第3透镜13、光圈15、具有正的光学倍率的第4透镜14构成，当以第3及第4透镜13、14的合成焦距为f34、系统整体的焦距为f时，满足条件式3＜f34/f＜10。
摘要（英）：

Provided are a wide angle optical system having better optical performance, low in cost, and compact in size, an imaging lens device having the wide angle optical system, a monitor camera, and a digital apparatus. The wide angle optical system (1) has, in order from the object side to the image side, a first lens (11) having a negative optical power, a second lens (12) having a negative optical power, a third lens (13) having a positive optical power, an aperture (15), and a fourth lens (14) having a positive optical power. The wide angle optical system satisfies the conditional expression of3 < f34/f < 10, where f34 is the composite focal length of the third and fourth lenses (13, 14) and f is the focal length of the entire system.

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