| 发明名称 | Photographic lens optical system | ||
| 摘要 | First, second, third, and fourth lenses (in order from an object side) are arranged between the object and an image sensor where an image of the object is formed. The first lens may have a positive refractive power and may be a meniscus lens that is convex toward the object. The second lens may have a positive refractive power and may be a meniscus lens that is convex toward the image sensor. The third lens may have a positive refractive power and may be a meniscus lens that is convex toward the image sensor. At least one of an incident surface and an exit surface of the fourth lens may be an aspherical surface. The fourth lens may have a negative refractive power or a positive refractive power. A viewing angle θ of the lens optical system may satisfy a conditional expression, 2.5<|tan θ|<3.5. | ||
| 申请公布号 | US9025259(B2) | 申请公布日期 | 2015.05.05 |
| 申请号 | US201314144787 | 申请日期 | 2013.12.31 |
| 申请人 | Kolen Co., Ltd. | 发明人 | Ahn Chi Ho;Cho Jae-Hoon;Kim Ji Eun;Kang Chan Goo;Kim Se Jin |
| 分类号 | G02B9/34;G02B13/00;G02B5/20 | 主分类号 | G02B9/34 |
| 代理机构 | St. Onge Steward Johnston & Reens LLC | 代理人 | St. Onge Steward Johnston & Reens LLC |
| 主权项 | 1. A lens optical system comprising first, second, third, and fourth lenses that are arranged between an object and an image sensor where an image of the object is formed, in order from an object side, wherein the first lens has a positive (+) refractive power and a meniscus shape that is convex toward the object, the second lens has a positive (+) refractive power and a meniscus shape that is convex toward the image sensor, the third lens has a positive (+) refractive power and a meniscus shape that is convex toward the image sensor, and at least one of an incident surface and an exit surface of the fourth lens is an aspherical surface, wherein the lens optical system satisfies the following conditional expression, 2.5<|tan θ|<3.5, wherein θ is a viewing angle of the lens optical system. | ||
| 地址 | KR | ||