Optical system, and optical module and camera module comprising same

An optical module comprising:

• an optical system;
• and
• an image sensor unit where light passing through the optical system is incident,
• wherein the optical system comprises a first lens group and a second lens group sequentially arranged along an optical axis from an object side to an image side and wherein each of the first and second lens groups includes at least one lens, and wherein each lens has an object side and an image side,
• wherein a refractive power sign of the first lens group and a refractive power sign of the second lens group are opposite to each other,
• wherein the first lens group includes a first lens, a second lens, and a third lens sequentially arranged along the optical axis in a direction from the object side to the image side,
• wherein the second lens group includes a fourth lens and a fifth lens sequentially arranged along the optical axis in the direction from the object side to the image side.
• wherein the first lens group includes at least one lens having a non-circular shape, and
• wherein the first lens group and the second lens group satisfy Equations 1 and 8 below:
• 0.6
• <
• ❘
• "\[LeftBracketingBar]"
• f_
• ⁢
• 1
• /
• f_
• ⁢
• 2
• ❘
• "\[RightBracketingBar]"
• <
• 1.4
• is
• ⁢
• satisfied
• ,
• [
• Equation
• ⁢
• l
• ]
• (f_1 is a focal length of the first lens group, and f_2 is a focal length of the second lens group);
• 2
• <
• T34_
• ⁢
• 2
• /
• T
• ⁢
• 34
• ⁢
• _
• ⁢
• 1
• <
• 7
• [
• Equation
• ⁢
• 8
• ]
• (In Equation 8, T34_1 is a distance between the third lens and the fourth lens at a maximum moving distance of the second lens group in a first mode, T34_2 is a distance between a third lens and a fourth lens at a maximum moving distance of the second lens group in a second mode).