Abstract: An optical system, sequentially comprising from an object side to an image side: a first lens having a negative refractive power, an object-side surface of the first lens being a convex surface, and an image-side surface thereof being a concave surface; a second lens having a negative refractive power, an image-side surface of the second lens being a concave surface; a third lens having a positive refractive power; a diaphragm; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power. The optical system satisfies the following relationship: (SD S2)/(RDY S2)<0.93, wherein SD S2 is the Y-direction half aperture of the image-side surface of the first lens, and RDY S2 is the Y radius of the image-side surface of the first lens.

Abstract: The present application discloses an optical system, a camera module, and a terminal device. The optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has refractive power, the fifth lens has refractive power, and the sixth lens has refractive power. The optical system satisfies the following relational expression: 1.2<IMGH/EPD<1.4. Wherein, IMGH is half of an image height corresponding to a maximum field of view of the optical system, and EPD is an entrance pupil diameter of the optical system. The optical system of the present application may have large aperture and high imaging quality while maintaining a lightweight and compact design.

Abstract: An optical system, sequentially comprising from an object side to an image side: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power, both the object side surface and the image side surface of the fourth lens being convex; a fifth lens having negative refractive power, both the object side surface and the image side surface of the fifth lens being concave; and a sixth lens having positive refractive power, both the object side surface and the image side surface of the sixth lens being convex. The optical system satisfies the following relationship: ?47<f45/f<27, wherein f45 represents a combined focal length of the fourth lens and the fifth lens, and f represents an effective focal length of the optical system.

Abstract: Provided is an optical system, sequentially comprising, from an object side to an image side, a first lens having negative refractive power, an object side face of the first lens being convex, and an image side face being concave; a second lens having negative refractive power, an image side face of the second lens being concave; a third lens having positive refractive power, an object side face and an image side face of the third lens each being convex; a fourth lens having positive refractive power, an object side face and an image side face of the fourth lens each being convex; a lens unit having refractive power; and a stop arranged on an object side of the fourth lens. The optical system satisfies the condition of FOV/CRA>10.

Abstract: An optical system, sequentially comprising from an object side to an image side: a first lens having a negative refractive power, an object-side surface of the first lens being a convex surface, and an image-side surface thereof being a concave surface; a second lens having a negative refractive power, an image-side surface of the second lens being a concave surface; a third lens having a positive refractive power; a diaphragm; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power. The optical system satisfies the following relationship: (SD S2)/(RDY S2)<0.93, wherein SD S2 is the Y-direction half aperture of the image-side surface of the first lens, and RDY S2 is the Y radius of the image-side surface of the first lens.