发明名称 |
Imaging lens and imaging apparatus equipped with the imaging lens |
摘要 |
An imaging lens, substantially consisting of five lenses, composed of a positive first lens with a convex surface on the object side, a negative second lens with a concave surface on the object side, a third lens having a negative meniscus shape with a convex surface on the object side, a fourth lens having a positive meniscus shape with a concave surface on the object side, and a negative fifth lens with a concave surface on the image side, the image side surface having an aspherical shape with at least one inflection point located inward in a radial direction from the intersection between the image side surface and a principal ray of the maximum angle of view toward the optical axis, disposed in order from the object side, and satisfies given conditional expressions. |
申请公布号 |
US9285565(B2) |
申请公布日期 |
2016.03.15 |
申请号 |
US201514595237 |
申请日期 |
2015.01.13 |
申请人 |
FUJIFILM Corporation |
发明人 |
Tanaka Takuya;Cho Michio;Noda Takayuki |
分类号 |
G02B3/02;G02B13/18;G02B9/60;G02B13/00;G03B13/32 |
主分类号 |
G02B3/02 |
代理机构 |
Young & Thompson |
代理人 |
Young & Thompson |
主权项 |
1. An imaging lens, substantially consisting of five lenses, composed of:
a first lens having a positive refractive power and a convex surface on the object side; a second lens having a negative refractive power and a concave surface on the object side; a third lens having a negative refractive power and a meniscus shape with a convex surface on the object side; a fourth lens having a positive refractive power and a meniscus shape with a concave surface on the object side; and a fifth lens having a negative refractive power and a concave surface on the image side, the image side surface having an aspherical shape with at least one inflection point located inward in a radial direction from the intersection between the image side surface and a principal ray of the maximum angle of view toward the optical axis, disposed in order from the object side, wherein the imaging lens satisfies conditional expressions given below:
0.91<f/f1<2.47 (1)−2.13<f/f5<−1.03 (2)1.2<TTL/(f·tan ω)<1.57 (3)where
f: focal length of the entire system, f1: focal length of the first lens, f5: focal length of the fifth lens, TTL: distance on the optical axis from the object side surface of the first lens to the image plane when the back focus is expressed in air equivalent distance, and ω: maximum half angle of view when an object at infinity is in focus. |
地址 |
Tokyo JP |