Optical imaging lens

An optical imaging lens, comprising, in order from an object side to an image side along an optical axis:

• a first lens having a positive refractive power;
• a second lens having a positive refractive power;
• a third lens having a negative refractive power;
• a fourth lens;
• a fifth lens having a negative refractive power;
• and
• a sixth lens having a positive refractive power,
• wherein a total effective focal length f of the optical imaging lens and an entrance pupil diameter EPD of the optical imaging lens satisfy f/EPD<2.0;
• and
• the total effective focal length f of the optical imaging lens satisfies 6.0 mm<f<7.5 mm;
• wherein a combined focal length f56 of the fifth lens and the sixth lens and a combined focal length f34 of the third lens and the fourth lens satisfy 2.6<f56/f34<3.8.

An optical imaging lens, comprising, in order from an object side to an image side along an optical axis:

• a first lens having a positive refractive power;
• a second lens having a positive refractive power;
• a third lens having a negative refractive power;
• a fourth lens;
• a fifth lens having a negative refractive power;
• and
• a sixth lens having a positive refractive power,
• wherein a total effective focal length f of the optical imaging lens and an entrance pupil diameter EPD of the optical imaging lens satisfy f/EPD<2.0;
• and
• the total effective focal length f of the optical imaging lens satisfies 6.0 mm<f<7.5 mm;
• wherein an on-axis distance SAG51 between an intersection point of an object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens, an on-axis distance SAG52 between an intersection point of an image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens, an on-axis distance SAG61 between an intersection point of an object side surface of the sixth lens and the optical axis and an effective radius vertex of the object side surface of the sixth lens, and an on-axis distance SAG62 between an intersection point of an image side surface of the sixth lens and the optical axis and an effective radius vertex of the image side surface of the sixth lens satisfy 1.0<(SAG51+SAG52)/(SAG61+SAG62)<2.3.