Optical system, image-capturing device comprising optical system and method for manufacturing optical system
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United States of America Patent
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May 28, 2019
Grant Date -
Jan 25, 2018
app pub date -
Jan 21, 2016
filing date -
Jan 23, 2015
priority date (Note) -
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Abstract
An optical system includes, disposed in sequence along an optical axis starting on an object side: a first lens group having a positive refractive power, which remains fixed relative to an image surface upon focusing; and a second lens group having a positive refractive power, which moves along the optical axis upon focusing, wherein: the first lens group includes: a first partial lens group that comprises at least two positive lenses and has a positive refractive power; and a negative lens, the second lens group includes: at least one meniscus lens with a convex surface thereof facing the object side; a second partial lens group that includes at least one negative lens and at least one positive lens, and has a positive refractive power; and a cemented lens that is formed by bonding together a plurality of lenses and has a positive refractive power, wherein: a predetermined conditional expression is satisfied.
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