Image forming lens and image capturing device
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United States of America Patent
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Jan 9, 2018
Issued Date -
N/A
app pub date -
Aug 6, 2015
filing date -
Sep 17, 2014
priority date (Note) -
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Abstract
An image forming lens is formed by sequentially arranging, from an object side to an image side, a first lens group having positive refractive power, an aperture stop, a second lens group having positive refractive power, and a third lens group having positive or negative refractive power. When focusing is performed from a long distance to a short distance, the third lens group is fixed relative to an image surface, and the first lens group, the aperture stop, and the second lens group are moved integrally to the object side. In the image forming lens, the third lens group is formed by sequentially arranging, from the object side to the image side, two lenses in order of a negative lens and a positive lens, and a conditional expression is satisfied:
where
- D is an air space between the negative lens and the positive lens which form the third lens group, and L3F-I is a distance from an object-side surface of the negative lens of the third lens group to the image surface.
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