Optical imaging lens

An optical imaging lens comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, an eighth lens element, and a seventh lens element sequentially from an object side to an image side along an optical axis, the first lens element being arranged to be a lens element in a first order from the object side to the image side, the second lens element being arranged to be a lens element in a second order from the object side to the image side, the third lens element being arranged to be a lens element in a third order from the object side to the image side, the fourth lens element being arranged to be a lens element in a fourth order from the object side to the image side, the fifth lens element being arranged to be a lens element in a fifth order from the object side to the image side, the sixth lens element being arranged to be a lens element in a sixth order from the object side to the image side, the seventh lens element being arranged to be a lens element in a last order from the object side to the image side, the eighth lens element is located between the sixth lens element and the seventh lens element, the first lens element to the seventh lens element each comprising an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through, and lens elements of this optical imaging lens are only the first to eighth lens elements, wherein:

• the first lens element has positive refracting power, and the image-side surface of the first lens element comprises a concave portion in a vicinity of the periphery of the first lens element;
• the second lens element has negative refracting power;
• and
• the eighth lens element has positive refracting power, the image-side surface of the eighth lens element comprises a concave portion in a vicinity of the optical axis, and the image-side surface of the eighth lens element comprises a convex portion in a vicinity of the periphery of the eighth lens element.

An optical imaging lens comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, an eighth lens element, and a seventh lens element sequentially from an object side to an image side along an optical axis, the first lens element being arranged to be a lens element in a first order from the object side to the image side, the second lens element being arranged to be a lens element in a second order from the object side to the image side, the third lens element being arranged to be a lens element in a third order from the object side to the image side, the fourth lens element being arranged to be a lens element in a fourth order from the object side to the image side, the fifth lens element being arranged to be a lens element in a fifth order from the object side to the image side, the sixth lens element being arranged to be a lens element in a sixth order from the object side to the image side, the seventh lens element being arranged to be a lens element in a last order from the object side to the image side, the eighth lens element is located between the sixth lens element and the seventh lens element, the first lens element to the seventh lens element each comprising an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through, and lens elements of this optical imaging lens are only the first to eighth lens elements, wherein:

• the image-side surface of the first lens element comprises a concave portion in a vicinity of the periphery of the first lens element;
• the second lens element has negative refracting power;
• and
• the eighth lens element has positive refracting power, the object-side surface of the eighth lens element comprises a concave portion in a vicinity of the periphery of the eighth lens element, and the image-side surface of the eighth lens element comprises a concave portion in a vicinity of the optical axis.