| 摘要 |
An optical system for an endoscope has, in order from its object side, an objective lens system having a first lens unit with a negative refractive power, a second lens unit with a positive refractive power and an aspherical surface therein, and relay lens systems arranged on the image side of the objective lens system. The optical system for an endoscope can correct aberrations, assure uniform brightness over the entire range of an image from its center to its peripheral areas, and permits reducing the diameter of the cover glass plate used therein.
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