1results about How to "Reduce astigmatism" patented technology

The invention discloses an optical system, a pick-up lens and an electronic device, and aims to realize lightening and thinning and shorter total length of the optical system and improve the pixel and imaging quality of the optical system. The optical system sequentially comprises a diaphragm, a first lens with positive focal power, a second lens with negative focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power, a sixth lens with positive focal power and a seventh lens with negative focal power from an object side to an image side along an optical axis, the object side surface of the first lens, the object side surface of the second lens, the image side surface of the third lens, the image side surface of the fifth lens and the object side surface of the sixth lens are convex surfaces in a paraxial region. The image side surface of the first lens, the image side surface of the second lens, the object side surface of the third lens, the object side surface of the fifth lens, the image side surface of the sixth lens, and the object side surface and the image side surface of the seventh lens are concave surfaces at a paraxial region. The optical system satisfies the relational expression: 1.45 lt; fNOlt, FNOlt; 1.9, 79 degree lt; a FOVlt; the angle is 91 degrees, 1.2 lt; and TTL / ImgHlt; and 1.4.