This application discloses an optical lens, an optical module, and an electronic device. The optical lens of this application sequentially includes, from an object side to an image side along an optical axis: a first lens with a negative bending force, where an object side surface of the first lens is convex, and an image side surface of the first lens is concave; a second lens with a positive bending force, where an object side surface of the second lens is convex, and an image side surface of the second lens is concave; a third lens with a positive bending force; a fourth lens with a positive bending force and biconvex surfaces; a fifth lens with a negative bending force and biconcave surfaces; a sixth lens with a positive bending force; and a seventh lens with a negative bending force.

This application discloses an optical lens, an optical module, and an electronic device. The optical lens of this application sequentially includes, from an object side to an image side along an optical axis: a first lens with a negative bending force, where an object side surface of the first lens is convex, and an image side surface of the first lens is concave; a second lens with a positive bending force, where an object side surface of the second lens is convex, and an image side surface of the second lens is concave; a third lens with a positive bending force; a fourth lens with a positive bending force and biconvex surfaces; a fifth lens with a negative bending force and biconcave surfaces; a sixth lens with a positive bending force; and a seventh lens with a negative bending force.

The present subject matter described an optical microscopy device (2) for a portable imaging system, such as a smartphone. The optical microscopy device (2) comprises an optical lens assembly with ten to sixteen lens elements. The optical lens assembly has an optical magnification in a range of about 1X to about 3X, an airy radius in a range of about 3.2 micron to about 15 micron, a depth of field in a range of about 28 micron to about 133 micron, a numerical aperture in a range of about 0.025 to about 0.176, a half field of view in a range of about 10 degrees to about 39 degrees, and a length in a range of about 6.8 millimeter (mm) to about 18 mm.

An optical imaging lens includes a first lens element to a ninth lens element from an object side to an image side along an optical axis. The second lens element has negative refracting power or the third lens element has positive refracting power, a periphery region of the image-side surface of the second lens element is concave, the fourth lens element has negative refracting power, the sixth lens element has negative refracting power, an optical axis region of the image-side surface of the seventh lens element is concave, and an optical axis region of the image-side surface of the ninth lens element is concave. Lens elements included by the optical imaging lens are only nine lens elements described above to satisfy (V5+V6+V7)/(V3+V4)≥1.100.

An optical imaging lens includes a first lens element to a ninth lens element from an object side to an image side along an optical axis. The second lens element has negative refracting power or the third lens element has positive refracting power, a periphery region of the image-side surface of the second lens element is concave, the fourth lens element has negative refracting power, the sixth lens element has negative refracting power, an optical axis region of the image-side surface of the seventh lens element is concave, and an optical axis region of the image-side surface of the ninth lens element is concave. Lens elements included by the optical imaging lens are only nine lens elements described above to satisfy (V5+V6+V7)/(V3+V4)≥1.100.

A photographing optical lens assembly includes seven lens elements, which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element has negative refractive power. The third lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The fifth lens element has an object-side surface being concave in a paraxial region thereof. The sixth lens element has an object-side surface being convex in a paraxial region thereof. The seventh lens element has an image-side surface being concave in a paraxial region thereof and having at least one convex critical point in an off-axis region thereof.

A photographing optical lens assembly includes seven lens elements, which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element has negative refractive power. The third lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The fifth lens element has an object-side surface being concave in a paraxial region thereof. The sixth lens element has an object-side surface being convex in a paraxial region thereof. The seventh lens element has an image-side surface being concave in a paraxial region thereof and having at least one convex critical point in an off-axis region thereof.

An optical system includes a first unit having positive refractive power, a second unit having positive or negative refractive power and configured to move in focusing, and a third unit having negative refractive power in order from an object side to an image side. A distance between adjacent two of the units changes in focusing. When a distance on an optical axis from a lens surface closest to the object side to a lens surface closest to the image side is TL, a distance on the optical axis from a lens surface closest to the object side to a lens surface closest to the image side in the third unit is TL3, a sum of thicknesses, on the optical axis, of lenses in the third unit is SD3, and the largest of the thicknesses of the lenses in the third unit is DM3, the optical system satisfies predetermined conditional inequalities.

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens having a negative refractive power, a fifth lens having a negative refractive power, a sixth lens, and a seventh lens having a positive refractive power. The first lens to seventh lens are sequentially disposed in a direction from an object side toward an imaging plane.

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens having a negative refractive power, a fifth lens having a negative refractive power, a sixth lens, and a seventh lens having a positive refractive power. The first lens to seventh lens are sequentially disposed in a direction from an object side toward an imaging plane.