Camera optical lens

A camera optical lens, sequentially comprising six lenses from an object side to an image side:

• a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, and a fifth lens having positive refractive power, and a sixth lens having negative refractive power;
• wherein a focal length of the camera optical lens is f, a focal length of the second lens is f2, a focal length of the fourth lens is f4, an on-axis thickness of the first lens is d1, an on-axis thickness of the second lens is d3, an on-axis distance from an image side surface of the first lens to an object side surface of the second lens is d2, a central curvature radius of an object side surface of the first lens in a paraxial region is R1, a central curvature radius of an image side surface of the first lens in the paraxial region is R2, a central curvature radius of an image side surface of the third lens in the paraxial region is R6, and a central curvature radius of an object side surface of the fourth lens in the paraxial region is R7, and following relational expressions are satisfied:
• 7.
• ≤
• (
• f
• ⁢
• 2
• -
• f
• ⁢
• 4
• )
• /
• f
• ≤
• 10.
• ;
• 2.5
• ≤
• (
• d
• ⁢
• 1
• +
• d
• ⁢
• 3
• )
• /
• d
• ⁢
• 2
• ≤
• 4.5
• ;
• -
• 0.7
• ≤
• R
• ⁢
• 1
• /
• R
• ⁢
• 2
• ≤
• -
• 0.2
• ;
• and
• -
• 5.
• ≤
• R
• ⁢
• 7
• /
• R
• ⁢
• 6
• ≤
• -
• 1.5
• .