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 a first lens group, a second lens group, and a third lens group are sequentially arranged along an optical axis from an object side to an image side and each lens group 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, and
• wherein the first lens group, the second lens group, and the third lens group satisfy Equation 4 below:
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• Equation
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• 4
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• (In Equation 4, P1, P2, P3, P4, P5, and P6 refer to refractive power of a first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively).

A camera module comprising:

• an optical system;
• an image sensor unit where light passing through the optical system is incident;
• and
• a driving member that drives the optical system,
• wherein the optical system comprises a first lens group, a second lens group, and a third lens group, which are sequentially arranged along an optical axis from an object side to an image side and each lens group includes at least one lens;
• wherein the refractive power sign of the first lens group and the refractive power sign of the second lens group are opposite to each other,
• wherein the driving member controls a position of the second lens group, and
• wherein the first lens group, the second lens group, and the third lens group satisfy Equation 4 below:
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• Equation
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• 4
• ]
• (In Equation 4, P1, P2, P3, P4, P5, and P6 refer to refractive power of a first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively).