Abstract: An optical imaging lens comprises first, second, third, fourth, fifth and sixth lens elements arranged sequentially from an object side to an image side along an optical axis. Each of the lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The object-side surface of the first lens element has a convex portion in the vicinity of the optical axis. The third lens element has positive refracting power. The object-side surface of the third lens element has a concave portion in the vicinity of the optical axis. The object-side surface of the fourth lens element has a concave portion in the vicinity of the optical axis. The object-side surface of the fifth lens element has a concave portion in the vicinity of its periphery.

Abstract: An optical imaging lens includes six lens elements disposed sequentially from an object side to an image side. The image-side surface of the first lens element includes a concave portion in a vicinity of an optical axis. The fifth lens element has negative refractive power and the image-side surface of the fifth lens element includes a convex portion in a vicinity of the optical axis. The image-side surface of the sixth lens element includes a concave portion in a vicinity of the optical axis. The optical imaging lens as a whole has only the six lens elements having refractive power.

Abstract: An optical imaging lens includes first, second, third, fourth and fifth lens elements arranged sequentially from an object side to an image side along an optical axis. The image-side surface of the first lens element comprises a concave portion in a vicinity of the optical axis. The object-side surface of the fourth lens element comprises a concave portion in a vicinity of the optical axis. The optical imaging lens as a whole has only the five lens elements having refractive power.

Abstract: Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces, the refracting power of the lens elements and parameters to meet an inequality associated with the effective focal length, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

Abstract: An ocular optical system for imaging of imaging rays entering an eye of an observer via the ocular optical system from a display screen is provided. A side facing towards the eye is an eye-side, and a side facing towards the display screen is a display-side. The ocular optical system includes a first lens element, a second lens element, and a third lens element from the eye-side to the display-side in order along an optical axis. The first lens element, the second lens element, and the third lens element each include an eye-side surface and a display-side surface. Lens elements having refracting power of the ocular optical system are only the first lens element, the second lens element, and the third lens element.

Abstract: A Fresnel lens includes a Fresnel surface that includes effective Fresnel surfaces allowing imaging rays to pass through. Two adjacent effective Fresnel surfaces are connected through a non-effective Fresnel surface. On a cross-section including an optical axis of the Fresnel lens, a draft angle is between a reference line and a connecting straight line between one end of each non-effective Fresnel surface located at a tooth peak of the Fresnel lens and the other end of each non-effective Fresnel surface located at a tooth valley of the Fresnel lens. The optical axis coincides with the cross-section. The reference line is parallel to the optical axis and passes through the end of the effective Fresnel surface located at the tooth peak of the Fresnel lens. The draft angles each smaller than 90 degrees include first, second, third, fourth, and fifth draft angles which gradually increase radially outward from the optical axis.

Abstract: An imaging lens includes first to fifth lens elements arranged from an object side to an image side in the given order. Through designs of surfaces of the lens elements and relevant optical parameters, a short system length of the imaging lens may be achieved while maintaining good optical performance.

Abstract: An optical imaging lens including a first lens element, a second lens element, a third lens element, an aperture, a fourth lens element and a fifth lens element is provided. The first lens element is arranged to be a lens element of which refracting power being equal to 0 inverse millimeter (mm?1) in a first order from the object-side to the image-side. The second lens element is arranged to be a lens element having refracting power in a first order from the first lens element to the image-side. The third lens element is arranged to be a lens element having refracting power in a second order from the first lens element to the image-side. The fourth and fifth lens element are respectively arranged to be lens elements having refracting power in a first and a second order from the aperture to the image-side.

Abstract: An optical imaging lens includes six lens elements disposed sequentially from an object side to an image side. The image-side surface of the first lens element comprises a concave portion in a vicinity of an optical axis. The third lens element has positive refracting power. The fourth lens element has positive refracting power. The image-side surface of the fifth lens element comprises a convex portion in a vicinity of the optical axis. The optical imaging lens as a whole has only the six lens elements having refractive power.

Abstract: An optical imaging lens includes first, second, third, fourth and fifth lens elements arranged sequentially from an object side to an image side along an optical axis. The image-side surface of the first lens element comprises a convex portion in a vicinity of its periphery. The third lens element has negative power. The object-side surface of the fifth lens element comprises a concave portion in a vicinity of its periphery. The optical imaging lens as a whole has only the five lens elements having refractive power.

Abstract: An ocular optical system for imaging of imaging rays entering an eye of an observer via the ocular optical system from a display screen is provided. A side facing towards the eye is an eye-side, and a side facing towards the display screen is a display-side. The ocular optical system includes a first lens element, a second lens element, and a third lens element from the eye-side to the display-side in order along an optical axis. The first lens element, the second lens element, and the third lens element each include an eye-side surface and a display-side surface. The second lens element has positive refracting power, and the display-side surface of the second lens element has a concave portion in a vicinity of the optical axis.

Abstract: An imaging lens includes first, second, third, fourth, fifth and six 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 image-side surface of the second lens element has a concave portion in a vicinity of the optical axis. The third lens element has negative refractive power. The object-side surface of the third lens element has a concave portion in a vicinity of the optical axis. The object-side surface of the fifth lens element has a convex portion in a vicinity of a periphery. All lens elements of the imaging lens having the refractive power are only the first, second, third, fourth, fifth and six lens elements.

Abstract: An imaging lens includes first to fifth lens elements arranged from an object side to an image side in the given order. Through designs of surfaces of the lens elements and relevant optical parameters, a short system length of the imaging lens may be achieved while maintaining good optical performance.

Abstract: An ocular optical system configured to allow imaging rays from a display frame to enter an observer's eye through the ocular optical system to form an image is provided. The ocular optical system includes a lens element having an eye-side surface and a display-side surface. The lens element has an optical axis extending from a display side toward an eye side. The display-side surface of the lens element adopts a Fresnel lens design. The display-side has a plurality of effective sub-surfaces and a plurality of ineffective sub-surfaces. The effective sub-surfaces are configured to allow the image rays to form an image. Each ineffective sub-surface connects two adjacent effective sub-surfaces. The ocular optical system satisfies: 25.000°???52.000°, where ? represents a maximum tilting angle of the effective sub-surfaces relative to a reference plane perpendicular to the optical axis.

Abstract: An ocular optical system includes a first lens element of a display-side surface with a convex portion in a vicinity of its periphery, a second lens element of positive refractive power and an eye-side surface with a concave portion in a vicinity of its periphery, a third lens element of negative refractive power and an display-side surface with a concave portion in a vicinity of an optical-axis, or a fourth lens element of an display-side surface with a concave portion in a vicinity of the optical-axis.

Abstract: An optical imaging system includes, in the given order from the object side to the image side, a first lens element, a second lens element, a third lens element, and a fourth lens element arranged along an optical axis. The lens elements of the optical imaging systems may be made of the same material having absorption in visible wavelengths and high transmission in near infrared radiation. The lens elements may be coated with an antireflective coating that is optimized for near infrared radiation. The optical imaging system satisfies the relations 2.13°?HFOV/Fno?8.75°, and 0.56?G23/T1?1.54, where HFOV is the half field of view and Fno is the F number of the optical imaging system, G23 is an air gap between the second and third lens elements along the optical axis, and T1 is a thickness of the first lens element along the optical axis.

Abstract: An optical imaging lens includes a first lens of negative refractive power, a second lens of negative refractive power and of an image-side surface with a concave portion in a vicinity of its optical-axis, at least one of an object-side surface and of an image-side surface of a third lens being an aspherical surface and a fourth lens of an object-side surface with a concave portion in a vicinity of its optical-axis. An aperture stop is disposed between the first lens element and the third lens element. The Abbe number ?1 of the first lens element and the Abbe number ?4 of the fourth lens element satisfy 45??1?65 or 18??4?35.

Abstract: An optical imaging lens including a first lens element to a sixth lens element arranged in sequence from an object side to an image side along an optical axis is provided. The first lens element to the third lens elements are respectively arranged to be lens elements in a first, a second and a third order from the object side to the image side. The fourth lens element to the sixth lens element are respectively arranged to be lens elements in a first, a second and a third order from an aperture to the image side.

Abstract: The present disclosure provides for various embodiments of optical imaging lenses. An optical imaging lens may comprise six lens elements positioned in an order from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements, the optical imaging lens may provide great view angle and proper length of the optical imaging lens and improve the imaging quality.

Abstract: Present embodiments provide for optical imaging lenses. An optical imaging lens may include five lens elements positioned sequentially from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics and the total length of the optical imaging lens may be shortened.