| 发明名称 |
Optical image capturing lens system |
| 摘要 |
An optical image capturing lens system 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 positive refractive power is made of plastic material, and has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region, wherein the surfaces of the second lens element are aspheric. The third lens element with negative refractive power is made of plastic material, and has an object-side surface being concave or planar at a paraxial region and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the surfaces of the third lens element are aspheric. |
| 申请公布号 |
US8743486(B2) |
申请公布日期 |
2014.06.03 |
| 申请号 |
US201213657075 |
申请日期 |
2012.10.22 |
| 申请人 |
Largan Precision Co., Ltd. |
发明人 |
Tsai Tsung-Han;Chen Wei-Yu |
| 分类号 |
G02B9/12;G02B13/18;G02B3/02;G02B13/00 |
主分类号 |
G02B9/12 |
| 代理机构 |
|
代理人 |
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| 主权项 |
1. An optical image capturing lens system comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object de surface being convex at a paraxial region; a second lens element with positive refractive power made of plastic material, and having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region, wherein 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 made of plastic material, and having an object-side surface being concave or planar at a paraxial region and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the object-side surface and the image-side surface of the third lens element are aspheric; wherein a curvature radius of the image-side surface of the second lens element is R4, a curvature radius of the object-side surface of the third lens element is R5, and the following relationship is satisfied:
−1.0≦(R4+R5)/(R4−R5)<1.0.
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| 地址 |
Taichung TW |
