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 and a seventh lens element arranged in sequence from an object side to an image side along an optical axis, each of the lens elements having an object-side surface facing the object side and allowing an imaging ray to pass through and an image-side surface facing the image side and allowing the imaging ray to pass through,

• wherein,
• lens elements of the optical imaging lens are only the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, and the seventh lens element;
• an optical axis region of the image-side surface of the fifth lens element is concave;
• wherein the optical imaging lens satisfies the following condition expression:
• ALT
• /
• T
• ⁢
• 1
• ≦
• 4
• .
• 5
• ⁢
• 0
• ⁢
• 0
• ,
• wherein ALT is a sum of center thicknesses of the seven lens elements including the first lens element through the seventh lens element along the optical axis, and T1 is a center thickness of the first lens element along the optical axis, wherein a center thickness of the third lens element along the optical axis is less than an air gap between the sixth lens element and the seventh lens element along the optical axis, and a center thickness of the fourth lens element along the optical axis is less than the air gap between the sixth lens element and the seventh lens element along the optical axis.

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 and a seventh lens element arranged in sequence from an object side to an image side along an optical axis, each of the lens elements having an object-side surface facing the object side and allowing an imaging ray to pass through and an image-side surface facing the image side and allowing the imaging ray to pass through,

• wherein,
• lens elements of the optical imaging lens are only the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, and the seventh lens element;
• an optical axis region of the image-side surface of the fifth lens element is concave;
• the fifth lens element has negative refracting power;
• a periphery region of the object-side surface of the fifth lens element is concave;
• and
• an optical axis region of the image-side surface of the fifth lens element is concave;
• wherein the optical imaging lens satisfies the following condition expression:
• ALT
• /
• (
• T
• ⁢
• 1
• +
• T
• ⁢
• 3
• +
• T
• ⁢
• 5
• )
• ≦
• 2
• .
• 6
• ⁢
• 0
• ⁢
• 0
• ,
• wherein ALT is a sum of center thicknesses of the seven lens elements including the first lens element through the seventh lens element along the optical axis, T1 is a center thickness of the first lens element along the optical axis, T3 is a center thickness of the third lens element along the optical axis, and T5 is a center thickness of the fifth lens element along the optical axis, wherein the center thickness of the third lens element along the optical axis is less than an air gap between the sixth lens element and the seventh lens element along the optical axis, and a center thickness of the fourth lens element along the optical axis is less than the air gap between the sixth lens element and the seventh lens element along the optical axis.