Objective optical system and endoscope using same
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United States of America Patent
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Nov 25, 2014
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app pub date -
Apr 28, 2014
filing date -
Nov 1, 2011
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Abstract
The angle of view of an objective optical system is widened, while suppressing generation of lateral chromatic aberration. An objective optical system includes: a first lens group having a negative power; an aperture stop; and a second lens group having a positive power, in this order from an object side. The first lens group includes a negative single first lens, and a cemented lens formed by cementing a positive lens and a negative lens together, provided in this order from the object side. The second lens group includes a positive single fourth lens, and a cemented lens formed by cementing a positive lens and a negative lens together, provided in this order from the object side. The objective optical system satisfies Conditional Formula (1): 15.0<νd(RN)<18.6, wherein νd(RN) is the Abbe's number of the negative lens in the cemented lens within the second lens group with respect to the d line.
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