| 摘要 |
An objective lens system for endoscopes comprising, in order from the object side, a first lens unit having a negative refractive power, an aperture stop, a second lens unit having a positive refractive power and a third lens unit having a positive refractive power, and using an aspherical surface adopted as an image side surface of the second lens unit or an object side surface of the third lens unit. The objective lens system is of a nearly telecentric retrofocus type, composed of a small number of lens elements and compact.
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