Lens assembly
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United States of America Patent
Stats
-
May 2, 2017
Issued Date -
N/A
app pub date -
Mar 23, 2015
filing date -
Mar 24, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with negative refractive power. The second, third, fourth and sixth lens are with refractive power. The fifth lens is with positive refractive power. The lens assembly satisfies: 0.078≦BFL/TTL≦0.4, 0.01≦f/TTL≦0.61, (Nd1+Nd2+Nd3+Nd4+Nd5+Nd6)/6<(Nd2+Nd3)/2 wherein BFL is a distance from an image side surface of the sixth lens to an image plane along the optical axis, TTL is a distance from the convex surface of the first lens to the image plane along the optical axis, f is an effective focal length of the lens assembly, and Nd1, Nd2, Nd3, Nd4, Nd5 and Nd6 are indexes of refraction of the first, second, third, fourth, fifth and sixth lenses.
First Claim
Other Claims data not available
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- G02B Class
- 22.62 % this patent is cited more than
- 8 Age
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