An optical lens (10), a lens module (100), and a terminal (1000) are provided. The optical lens (10) includes a first constituent element (S1), a second constituent element (S2), a third constituent element (S3), and a fourth constituent element (S4) arranged from an object side to an image side, and each of the constituent elements includes at least one lens element. The optical lens (10) satisfies the following relations: 9.08≤BFL≤11.745; and 0.6≤BFL/TTL≤0.67. In this way, the optical lens (10) can obtain a long back focal length BFL, and long-focus photographing of the optical lens (10) is implemented. In addition, an axial thickness TTL1 of a plurality of lenses of the optical lens (10) is small, so that a thickness of the terminal (1000) including the optical lens (10) may also be small.

An optical lens (10), a lens module (100), and a terminal (1000) are provided. The optical lens (10) includes a first constituent element (S1), a second constituent element (S2), a third constituent element (S3), and a fourth constituent element (S4) arranged from an object side to an image side, and each of the constituent elements includes at least one lens element. The optical lens (10) satisfies the following relations: 9.08≤BFL≤11.745; and 0.6≤BFL/TTL≤0.67. In this way, the optical lens (10) can obtain a long back focal length BFL, and long-focus photographing of the optical lens (10) is implemented. In addition, an axial thickness TTL1 of a plurality of lenses of the optical lens (10) is small, so that a thickness of the terminal (1000) including the optical lens (10) may also be small.

An optical imaging lens includes a first lens element, a second lens, an aperture stop, a third lens element and a fourth lens element from an object side to an image side in order along an optical axis, and each lens element has an object-side surface and an image-side surface. An optical axis region of the object-side surface of the second lens element is convex. Only the above-mentioned four lens elements of the optical imaging lens have refracting power to satisfies the relationship: HFOV≤15.000≤15.000°, 3.000≤TL/(G12+T2+G23) and TTL/BFL≤3.500.

An optical imaging lens includes a first lens element, a second lens, an aperture stop, a third lens element and a fourth lens element from an object side to an image side in order along an optical axis, and each lens element has an object-side surface and an image-side surface. An optical axis region of the object-side surface of the second lens element is convex. Only the above-mentioned four lens elements of the optical imaging lens have refracting power to satisfies the relationship: HFOV≤15.000≤15.000°, 3.000≤TL/(G12+T2+G23) and TTL/BFL≤3.500.

A folded telephoto lens system may include multiple lenses with refractive power and a light path folding element. Light entering the camera through lens(es) on a first path is refracted to the folding element, which changes direction of the light on to a second path with lens(es) that refract the light to form an image plane at a photosensor. At least one of the object side and image side surfaces of at least one of the lens elements may be aspheric. Total track length (TTL) of the lens system may be 14.0 mm or less. The lens system may be configured so that the telephoto ratio (TTL/f) is less than or equal to 1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the optical elements may be selected to achieve quality optical performance and high image resolution in a small form factor camera.

A folded telephoto lens system may include multiple lenses with refractive power and a light path folding element. Light entering the camera through lens(es) on a first path is refracted to the folding element, which changes direction of the light on to a second path with lens(es) that refract the light to form an image plane at a photosensor. At least one of the object side and image side surfaces of at least one of the lens elements may be aspheric. Total track length (TTL) of the lens system may be 14.0 mm or less. The lens system may be configured so that the telephoto ratio (TTL/f) is less than or equal to 1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the optical elements may be selected to achieve quality optical performance and high image resolution in a small form factor camera.

An optical lens includes a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4), which are successively coaxially arranged along the transmission direction of incident light, wherein the first lens (L1) and the fourth lens (L4) are negative meniscus lenses, the second lens (L2) is a positive meniscus lens, and the third lens (L3) is a positive plano-convex lens. The optical lens can be applied to an optical system of a laser processing device, when a utilized processing wavelength is different from a monitoring wavelength, the imaging chromatic aberration in a monitoring system may be eliminated, particularly when a wavelength of the far infrared region is utilized as a wavelength for laser processing. When using the red light wavelength as the monitoring wavelength, the monitoring system can achieve a better imaging effect, thus ensuring the quality of laser processing.

An optical imaging lens includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The first lens element has positive refracting power. The object-side surface of the first lens element has a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery.

An optical imaging lens includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The first lens element has positive refracting power. The object-side surface of the first lens element has a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery.

An optical imaging system includes a first lens, a second lens, a third lens, and a fourth lens sequentially disposed from an object side toward an image side on an optical axis, and a reflecting member disposed closer to the object side, as compared to the first lens, and having a reflecting surface configured to change a path of light to be incident to the first to fourth lenses. The first to fourth lenses are disposed to be spaced apart from each other by a preset distance along the optical axis, and 1.3<TTL/BFL<3.5, where TTL is a distance from an object-side surface of the first lens to an imaging plane of an image sensor, and BFL is a distance from an image-side surface of the fourth lens to the imaging plane of the image sensor.