Optical: systems and elements – Lens – Including a nonspherical surface
Patent
1994-05-02
1995-07-25
Ben, Loha
Optical: systems and elements
Lens
Including a nonspherical surface
359740, 359784, G02B 1318
Patent
active
054367670
ABSTRACT:
An objective lens system for endoscopes comprising, in order from the object side, a first lens component having negative refractive power, a second lens component having positive refractive power and a third lens component having positive refractive power; wherein astigmatism is corrected favorably by using an aspherical surface in the third lens component or an aperture stop is arranged between the second lens component and an image surface of the objective lens system, and aberrations including chromatic aberration are corrected favorably.
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patent: 4674844 (1987-06-01), Nishioka et al.
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patent: 4976522 (1990-12-01), Igarashi
patent: 5087989 (1992-02-01), Igarashi
patent: 5119238 (1992-06-01), Igarashi
patent: 5175650 (1992-12-01), Takayama et al.
Nishioka Kimihiko
Suzuki Takayuki
Takahashi Susumu
Ben Loha
Olympus Optica Co., Ltd.
Phan James
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