Abstract: An optical imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element sequentially arranged along an optical axis from an object side to an image side. Each of the first lens element to the fifth lens element has an object-side surface facing toward the object side and an image-side surface facing toward the image side. A distance between the image-side surface of the fifth lens element and an image plane along the optical axis is BFL, an air gap between the first lens element and the second lens element along the optical axis is G12, an air gap between the fourth lens element and the fifth lens element along the optical axis is G45, a central thickness of the fifth lens element along the optical axis is T5, satisfying the equation: 1.861?(BFL+G12)/(G45+T5)?3.055.

Abstract: An ocular optical system includes a first lens element, a second lens element and a third lens element from an eye-side to a 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 eye-side surface of the first lens element has a concave portion in a vicinity of the optical axis. The display-side surface of the third lens element has a concave portion in a vicinity of a periphery of the third lens element. The ocular optical system satisfies 1?TTL/ER?10, wherein TTL is a distance from the eye-side surface of the first lens element to the display screen along the optical axis, and ER is a distance from a pupil of the observer to the eye-side surface of the first lens element along the optical axis.

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 two parameters to meet an inequality associated with the thickness of the second lens element, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

Abstract: An imaging lens includes first to sixth 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 includes a first lens element and a second lens element from an eye-side to a display-side in order along an optical axis. The first lens element and the second lens element each include an eye-side surface and a display-side surface. The eye-side surface of the first lens element has a convex portion in a vicinity of the optical axis. The second lens element has negative refracting power. The ocular optical system satisfies 1.5?|f2/f1| and 250 millimeters/EFL?10, wherein f2 is the focal length of the second lens element, f1 is the focal length of the first lens element, and EFL is the effective focal length of the ocular optical system.

Abstract: An optical imaging lens sequentially includes a first, a second, a third, a fourth, a fifth, and a sixth lens elements from an object side to an image side along an optical axis. Each of the lens elements includes an object-side surface and an image-side surface. The second lens element has negative refracting power. A periphery region of the object-side surface of the fourth lens element is convex. A periphery region of the image-side surface of the fifth lens element is convex. The optical imaging lens satisfies following conditions: HFOV?45°; 2.000?D1/D2, and TTL/T6?6.300.

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 near its optical-axis, a third lens of an object-side surface with a convex portion near its optical-axis and an image-side surface with a convex portion near its optical-axis, a fourth lens of an object-side surface with a convex portion near its optical-axis, a fifth lens of an object-side surface with a concave portion near its periphery and an image-side surface with a concave portion in a vicinity of its optical-axis and a six lens of an image-side surface with a convex portion near its optical-axis. ALT is a total thickness of all six lens elements, AAG is a sum of all five air gaps and the first lens element has a first lens element thickness T1 to satisfy ALT/T1?6.70 or AAG/T1?4.71.

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 optical imaging lens includes first, second, third, fourth, fifth, and sixth lens elements, each having an object-side surface facing toward an object side and an image-side surface facing toward an image side. The image-side surface of the first lens element comprises a concave portion in a vicinity of a periphery of the first lens element and the image-side surface of the second lens element comprises a convex portion in a vicinity of the optical axis. The fourth lens element has positive refractive power. The image-side surface of the sixth lens element comprises a concave portion in a vicinity of the optical axis and the optical imaging lens as a whole has only the six lens elements having refractive power.

Abstract: An ocular optical system includes a first lens element and a second lens element from an eye-side to a display-side in order along an optical axis. The first lens element and the second lens element each include an eye-side surface and a display-side surface. The eye-side surface of the first lens element has a convex portion in a vicinity of the optical axis. The second lens element has negative refracting power. The ocular optical system satisfies 1.5?|f2/f1| and 250 millimeters/EFL?10, wherein f2 is the focal length of the second lens element, f1 is the focal length of the first lens element, and EFL is the effective focal length of the ocular optical system.

Abstract: An optical lens set includes: a first, second, third, fourth, fifth and sixth lens element, said first lens element has negative refractive power, said second lens element has negative refractive power, said fourth lens element has an object-side surface with a convex portion in a vicinity of the optical axis, and said fifth lens element has an image-side surface with a concave portion in a vicinity of the optical axis, in addition, at least one lens element of the six lens elements disposed adjacent to an aperture stop has positive refractive power and made by glass material, except for the lens elements with glass material, other lens elements with refractive powers are plastic lens elements, the Abbe numbers of the second and the third lens element are ?2 and ?3 respectively, and the optical imaging lens satisfies: |?2??3|?15.000.

Abstract: Present embodiments provide for an ocular optical system. The ocular optical system includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an eye-side to an display-side. Through designing parameters satisfying at least two inequalities and convex and/or concave surface of lens elements, the improved ocular optical system may provide better optical characteristics, a decreased effective focal length and an enlarged angle of view while the total length of the ocular optical system may be shortened.

Abstract: An optical lens assembly is provided. A plurality of infrared light beams emitted from a structured light generating unit having a plurality of light sources pass through the optical lens assembly to generate a plurality of light beams. A direction facing the structured light generating unit is a light input side, and an opposite side is a light output side. The optical lens assembly includes a first lens element, a second lens element and a third lens element arranged along an optical axis in a sequence from the light output side to the light input side.

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: An optical lens assembly is provided. The optical lens assembly includes first, second, third and fourth lens elements having refracting power arranged along an optical axis in a sequence from a light output side to a light input side. The first lens element is arranged to be a lens element in a fourth order from the light input side to the light output side. The second lens element is arranged to be a lens element in a third order from the light input side to the light output side. The third lens element is arranged to be a lens element in a second order from the light input side to the light output side. The fourth lens element is arranged to be a lens element in a first order from the light input side to the light output side.

Abstract: The optical imaging lens includes, sequentially from an object side to an image side in order from an optical axis, first, second, third, fourth, and fifth lens elements. The first lens element is made of plastic. The object-side of the second lens element has a convex portion in a vicinity of the optical axis. The third lens element is made of plastic. The object-side surface of the fourth lens element has a concave portion in the vicinity of its periphery. The sum of thicknesses of all five lens elements along the optical axis is ALT, the distance between the image-side surface of the fifth lens element and an image plane along the optical axis is BFL, and the optical imaging lens satisfies the equation: 1.167?ALT/BFL?1.685.

Abstract: Present embodiments provide for mobile devices and optical imaging lenses thereof. 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.

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: 1.500?R1/SagI?4.000, where SagI is a total of lengths of orthogonal projections of the effective sub-surfaces respectively projected onto the optical axis, and R1 is a half of a clear aperture of the display-side surface.

Abstract: The invention provides an optical imaging lens including a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element from an object side to an image side. The optical imaging lens has a shorter lens length, an enlarged field of view angle, and good thermal stability performance in a good optical performance condition via controlling arrangement of concave and convex curvatures of object-side surfaces or image-side surfaces of the lens elements and controlling relevant parameters via at least one condition expression.

Abstract: The present invention provides an optical imaging lens including a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in a sequence from an object side to an image side. The present invention can shorten the lens length, enlarge field of view angle and have good thermal stability performance in a good optical performance condition via controlling the concave and convex shape design and arrangement of the object side surface or the image side surface of the abovementioned lens element, controlling the material of the abovementioned lens element in the optical imaging lens, and satisfying conditional expressions.