Lens assembly and electronic device including the same

An electronic device comprising:

• a processor;
• and
• a lens assembly,
• wherein the lens assembly includes,
• an image sensor;
• a first lens group;
• a second lens group;
• and
• a third lens group,
• wherein the first lens group has a negative refractive power and includes at least two lenses disposed along an optical axis from the image sensor, and a first lens on an object side among the at least two lenses of the first lens group having a positive refractive power;
• wherein the second lens group has a positive refractive power and is configured to move along an optical axis direction between the first lens group and the image sensor, the second lens group including at least two lenses, wherein at least one lens of the at least two lenses of the second lens group has a negative refractive power;
• and
• wherein the third lens group has a negative refractive power and is configured to move back and forth along the optical axis direction between the second lens group and the image sensor, the third lens group comprises a 3-1 st lens having a positive refractive power and a 3-2nd lens having a negative refractive power and disposed between the 3-1st lens and the image sensor, and the 3-1st lens has a surface facing the image sensor with a first radius of curvature, and wherein the 3-2nd lens has a surface facing the object side having a second radius of curvature that is different from the first radius of curvature,
• wherein the processor is configured to increase a focal length of the lens assembly by moving at least one of the second lens group and the third lens group toward an object side in a zooming operation while the first lens group is static,
• wherein the lens assembly meets conditional equation 6 through conditional equation 9, wherein
• -
• 1
• .7
• ≤
• fG
• ⁢
• 11
• /
• fG
• ⁢
• 1
• ≤
• -
• 0.6
• [
• conditional
• ⁢
• equation
• ⁢
• 6
• ]
• -
• 3.2
• ≤
• β
• ⁢
• G
• ⁢
• 3
• ⁢
• t
• /
• β
• ⁢
• G
• ⁢
• 2
• ⁢
• t
• ≤
• -
• 2
• [
• conditional
• ⁢
• equation
• ⁢
• 7
• ]
• -
• 1.4
• ≤
• fG
• ⁢
• 2
• ⁢
• n
• /
• fG
• ⁢
• 2
• ≤
• -
• 0.5
• [
• conditional
• ⁢
• equation
• ⁢
• 8
• ]
• 1.4
• ≤
• ❘
• "\[LeftBracketingBar]"
• fG
• ⁢
• 1
• ❘
• "\[RightBracketingBar]"
• /
• fw
• ≤
• 2.5
• ,
• [
• conditional
• ⁢
• equation
• ⁢
• 9
• ]
• and
• wherein ‘fG11’ is a focal length of a first lens on the object side among lenses of the first lens group, ‘fG1’ is a focal length of the first lens group, ‘βG3t’ is an imaging magnification of the third lens group at a telephoto end, ‘βG2t’ is an imaging magnification of the second lens group at the telephoto end, ‘fG2n’ is a focal length of a lens having a negative refractive power in the second lens group, and ‘fG2’ is a focal length of the second lens group, and ‘fw’ is a focal length of the lens assembly at a wide-angle end.