发明名称 |
Photographing lens assembly |
摘要 |
A photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element and a third lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region. The second lens element with negative refractive power has an object-side surface being concave at a paraxial region and an image-side surface being concave or planar at a paraxial region, wherein the second lens element is made of plastic material and the surfaces thereof are aspheric. The third lens element with negative refractive power has an object-side surface being concave at a paraxial region, and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the third lens element is made of plastic material, and the surfaces thereof are aspheric. |
申请公布号 |
US8786964(B2) |
申请公布日期 |
2014.07.22 |
申请号 |
US201213647401 |
申请日期 |
2012.10.09 |
申请人 |
Largan Precision Co., Ltd. |
发明人 |
Tsai Tsung-Han;Chen Wei-Yu |
分类号 |
G02B3/02;G02B13/18;G02B9/12;G02B13/00 |
主分类号 |
G02B3/02 |
代理机构 |
CKC & Partners Co., Ltd. |
代理人 |
CKC & Partners Co., Ltd. |
主权项 |
1. A photographing lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex at a paraxial region; a second lens element with negative refractive power having an object-side surface being concave at a paraxial region and an image-side surface being concave or planar at a paraxial region, wherein the second lens element is made of plastic material and the object-side surface and the image-side surface of the second lens element are aspheric; and a third lens element with negative refractive power having an object-side surface being concave at a paraxial region, and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the third lens element is made of plastic material, and the object-side surface and the image-side surface of the third lens element are aspheric; wherein the photographing lens assembly has a total of three lens elements with refractive power; a distance in parallel with an optical axis from a maximum effective diameter position on the image-side surface of the second lens element to an axial vertex on the image-side surface of the second lens element is SAG22, a central thickness of the second lens element is CT2, and the following relationship is satisfied:
0<SAG22/CT2<0.40. |
地址 |
Taichung TW |