CPC G02B 13/0045 (2013.01) [G02B 9/62 (2013.01)] | 18 Claims |
1. An optical imaging system, sequentially from an object side to an image side of the optical imaging system along an optical axis, comprising:
a first lens having a negative refractive power, and an image-side surface of the first lens being concave;
a second lens having a positive refractive power;
a third lens having a positive refractive power, and an object-side surface of the third lens being convex and an image-side surface of the third lens being convex;
a fourth lens having a negative refractive power;
a fifth lens having a positive refractive power, and an image-side surface of the fifth lens being convex; and
a sixth lens having a negative refractive power;
wherein half of a maximum field-of-view Semi-FOV of the optical imaging system satisfies Semi-FOV>60°; and
wherein a maximum effective radius DT12 of the image-side surface of the first lens and a maximum effective radius DT62 of an image-side surface of the sixth lens satisfy 0.5<DT12/DT62<1;
wherein an on-axis distance SAG12 from an intersection of the image-side surface of the first lens and the optical axis to a vertex of an effective radius of the image-side surface of the first lens, and an edge thickness ET1 of the first lens satisfy: 0.5<SAG12/ET1<1.
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