发明授权
US3836234A Fully closing iris diaphragm 失效
完全关闭IRIS DIAPHRAGM

Fully closing iris diaphragm
摘要:
A fully-closing iris diaphragm is disclosed which consists of a substantially conventional iris diaphragm with the addition of a capping section to one leaf, which is positioned to obscure the minimum aperture obtainable without ''''scissoring'''' distortion of the leaves.
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