IMAGING LENS AND IMAGING DEVICE

• Main Author: YONEZAWA KEN
• Format: Patent
• Language: English; Japanese
• Published: 27.07.2015
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

PROBLEM TO BE SOLVED: To provide a high-performance imaging lens that has a wide angle, a reduced entire lens length, and a small F number, that suppresses an incident angle of a light beam to an image surface at a peripheral angle of view, and that can correspond to an image element in which the number of pixels has been increased, and an imaging device including the imaging lens.SOLUTION: An imaging lens is composed, from an object side, of a front group GA, a diaphragm, and a rear group GB. First and second lenses in the front group GA from the object side are respectively a negative meniscus lens and a negative lens that have convex surfaces facing the object side. First and second lenses in the front group GA from an image side are both positive lenses. The rear group GB is composed, from the object side, of a positive lens, a negative lens, and one or more positive lenses. The imaging lens satisfies the conditional expression of 2 ω>130°, when a maximum total angle of view represents 2 ω while the image lens is focusing on an object at infinity. 【課題】広角で、レンズ全長が短縮化され、Ｆナンバーが小さく、周辺画角において像面へ入射する光線の入射角が抑えられ、高画素化が進んだ撮像素子に対応可能な高性能の撮像レンズ、およびこの撮像レンズを備えた撮像装置を提供する。【解決手段】撮像レンズは、物体側から順に、前群ＧＡ、絞り、後群ＧＢからなる。前群ＧＡの物体側から１、２番目のレンズはそれぞれ、物体側に凸面を向けた負メニスカスレンズ、負レンズである。前群ＧＡの像側から１、２番目のレンズはともに正レンズである。後群ＧＢは、物体側から順に、正レンズ、負レンズ、１枚以上の正レンズからなる。撮像レンズは、無限遠物体に合焦した状態における最大全画角を２ωとしたとき、２ω＞１３０?の条件式を満足する。【選択図】図１