| 摘要 |
An image transmission optical system for an endoscope comprising a first lens component which comprises a positive lens, a second lens component which comprises two meniscus lenses arranged that the concave surfaces thereof face each other, a third lens component having positive refractive power, a fourth lens component which comprises two meniscus lenses arranged that the concave surfaces thereof face each other, and a fifth lens component which comprises a positive lens, the image transmission optical system being arranged to be symmetrical in respect to the center of the third lens component and arranged that curvature of field is corrected favorably.
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