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US07978423B2 Objective optical system for endoscopes 有权
内镜物镜光学系统

Objective optical system for endoscopes
摘要:
An objective optical system includes, in order from the object side, a first unit having two lenses with negative refracting power and positive refracting power, a stop, and a second unit with positive refracting power to satisfy the following condition: 3.0
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