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发明授权
CN101517450B 透镜结构 失效 - 权利终止

透镜结构
摘要：
本发明提供了一种适于透过小孔进行观察的透镜结构，其中不需要常规上一体形成的物理透镜光圈。该透镜结构对其位置相对不敏感，这意味着可以退后到孔的后方来设置该透镜结构，从而减少该透镜结构被发现的风险并能够快速安装。
摘要（英）：

A lens arrangement suitable for looking through small holes is provided in which no conventional integral physical lens stop is required. The lens arrangement is relatively insensitive to its position, meaning that it may be set back behind the hole reducing the risk of detection and allowing rapid installation.

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