38results about How to "Shorten the optical length" patented technology

The present invention provides an optical lens system comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element; and a fifth lens element having a convex object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one inflection point being formed on the image-side surface. Such arrangement of optical elements can effectively minimize the size of the optical lens system, lower the sensitivity of the optical system, and obtain higher image resolution.

Provided is an imaging lens using a wafer scale lens which can easily be produced in a mass production. The entire optical length can be reduced without increasing a lens substrate or a lens formed on the substrate or without using a diffracting plane. The aberration can be preferably corrected. The imaging lens forms a first lens having a positive refractive power and Abbe number v1 on the object side and a second lens having a negative refractive power and Abbe number v2 on the image side of the first lens substrate. The difference between the Abbe number v1 and the Abbe number (v1−v2) is set to be a value greater than 10.

A catoptric projection optical system for projecting a reduced size of a pattern on an object surface onto an image surface and for serving as an imaging system that forms an intermediate image between the object surface and image surface, includes six or more mirrors, wherein a position of an exit pupil with respect to the intermediate image is located between the object surface and image surface, and wherein the largest angle between principal rays and an optical axis for angles of view at the position of the exit pupil is sin⁻¹NA or smaller, where NA is a numerical aperture at the side of the image surface.

An image pick-up optical lens assembly, sequentially arranged from an object side to an image side along an optical axis, comprises: a first lens element with a positive refractive power having a convex object-side surface, a second lens element with a negative refractive power, a third lens element with a positive refractive power, a meniscus fourth lens element with a positive refractive power having at least one aspherical optical surface, and a fifth lens element with a positive refractive power having at least one inflection point on the optical image-side surface. Additionally, the image pick-up optical lens assembly satisfies several particular conditions. The invention possesses features such as good aberration compensation, well-performed modulation transfer function and short total length of lens assembly applicable for compact cameras and mobile phones.

The present invention relates to an auto-focusing optical system, and more particularly, to an auto-focusing optical system for a camera module, capable of obtaining a high resolution in a small size using a liquid lens whose curvature is varied depending on an applied voltage. In the auto-focusing optical system, a first lens group has a liquid lens whose curvature is varied and having a plus optical power, a second lens group has a plus optical power, and a third lens group has a minus optical power. Thanks to an auto-focusing optical system including a liquid lens according to the present invention, not only a manufacturing in a small size is possibly realized but also a high resolution can be obtained, and power consumption is small.

An image pickup optical system, sequentially arranged from an object side to an image side, comprises the first lens element with positive refractive power having a convex object-side surface, the second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, the third lens element with refractive power, the fourth lens element with refractive power having a concave image-side surface, at least one of the surfaces being aspheric, the fifth lens element with refractive power having a concave image-side surface, at least one of the surfaces being aspheric and having at least one inflection point. Each of the five lens elements may be made of plastic with aspherical surfaces. The image pickup optical system satisfies conditions related to the reduction of the total length and the system sensitivity for use in compact cameras and mobile phone cameras functionalities.

A first lens unit having negative power, a second lens unit having positive power, a third lens unit having negative power, and a fourth lens unit having positive power are disposed in this order from an object side. At least the first lens unit to the third lens unit move to change intervals between lens units so that magnification is varied. The second lens unit has at least one air interval inside and is split into two lens units with a boundary of an air interval closest to an image side in the second lens unit, which includes a second-a lens unit on the object side and a second-b lens unit on the image side, and the second-b lens unit is moved in a plane substantially perpendicular to an optical axis for damping vibrations.

Arranging a negative first lens, a positive second lens, a negative third lens, a positive fourth lens, and a negative fifth lens from the object side, in which the image side surface of the fifth lens has an aspherical shape with one or more inflection points and a concave shape toward the image side in a paraxial region, and, when the focal length of the entire lens system, radius of curvature of the image side surface of the first lens, radius of curvature of the image side surface of the second lens, overall optical length, focal length of j^th lens, and Abbe number of j^th lens are taken as f, R2, R4, TL, fj, and vj respectively, the image capturing lens is configured to simultaneously satisfy conditional expressions (1a): −1.5<f/R2<1.6, (2a): −1.6<f/R4<0.05, (3a): 0.95≦f4/f≦4.3, (5a): 1.0≦TL/f≦2.2, and (12b): −2.0<Σ(fj/νj)/f<0.5.

The invention relates to a refraction and reflection type large aperture and large field of view imaging system. The refraction and reflection type large aperture and large field of view imaging system is characterized in that a refraction type correction plate, a reflection type primary mirror and a refraction type correction mirror group are successively arranged along an optical axis from the outside to the inside; the central area of the second surface of the correction plate is plated with a reflective coating layer, and becomes a reflection type secondary mirror; an incident light beam irradiates to the reflection type primary mirror through the refraction type correction plate; the reflection type primary mirror reflects the incident light beam to the reflection type secondary mirror; and the reflection type secondary mirror reflects the light beam to the refraction type correction mirror group, and then the light beam passing through the refraction type correction mirror group is converged on a focal plane of an optical system. The refraction and reflection type large aperture and large field of view imaging system sets the refraction type correction plate within the focus of a reflection type spherical main mirror and takes the central area of the second surface of the correction plate as the reflection type secondary mirror and the diaphragm, thus having the advantages of ultra-short lens barrel and large field of view, and being able to be widely applied to the astronomy, aviation, security and protection, and other photoelectric imaging fields. The refraction and reflection type large aperture and large field of view imaging system can realize aberration reducing design for a 11DEG-15DEG field of view. However, the field of view for a traditional refraction and reflection type imaging system is only 3DEG-4DEG.

An optical lens assembly for image taking, sequentially from an object side to an image side along an optical axis comprises: the first lens element with refractive power, a bi-convex second lens element with positive refractive power, the third lens element with negative refractive power having a concave object-side surface and a convex image-side surface, the fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface. All four lenses may be made of plastic with bi-aspherical surfaces. Additionally, the optical lens assembly for image taking satisfies conditions to shorten the total length and reduce the sensitivity in order to achieve the goal of a fine aberration correction and ready for its use in cameras and camera mobile phones.

The present invention is an imaging lens in which various aberrations are favorably corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3 in succession from the object side to the image side. The first lens L1 is a lens having a positive refractive power and a meniscus shape in which the convex surface faces the object side, the second lens L2 is a lens having a negative refractive power and a meniscus shape in which the convex surface faces the image side, and the third lens L3 is a lens in which the convex surface faces the object side. The imaging lens satisfies the following conditions:

• • 0.35<r₁/r₂<0.45 (1)
  • 0.07<D₂/f<0.1 (2)
  • 0.01<D₄/f<0.04 (3) 1.00<d/f<1.30 (4)
  • 0.3<b_f/f<0.5 (5) where f is the combined focal length of the imaging lens,
  • r₁ is the radius of curvature (axial radius of curvature) of the object-side surface of the first lens L1 in the vicinity of the optical axis,
  • r₂ is the radius of curvature (axial radius of curvature) of the image-side surface of the first lens L1 in the vicinity of the optical axis,
  • D₂ is the distance between the first lens L1 and second lens L2,
  • D₄ is the distance between the second lens L2 and third lens L3,
  • d is the distance (atmospheric) from the object-side surface of the first lens L1 to the imaging surface, and
  • b_f is the distance (atmospheric) from the image-side surface of the third lens to the imaging surface.

The embodiment of the invention provides a camera module and a mobile terminal. The camera module comprises a lens, a voice coil motor, a base, an optical filter, a circuit board and an image sensor, wherein the lens is arranged on the voice coil motor; the base is provided with a first surface and a second surface which are opposite to each other, and an inner cavity passing through the first surface and the second surface; the voice coil motor is arranged on the first surface; the second surface of the base is arranged on the circuit board; the image sensor is embedded into the inner cavity of the base, and coaxially arranged on the circuit board together with the lens; the optical filter is attached to an upper surface of the image sensor; and a minimum cross-sectional area of the inner cavity of the base in a direction vertical to the axis direction of the lens is larger than the area of the optical filter. Through application of the camera module and the mobile terminal, the optical filter is prevented from being cracked by extrusion of the base; the space for fixing the optical filter is saved for the base simultaneously; more design space is provided for the lens; the optical length can be shortened in order to lower the height of the camera module; and the development of the mobile terminal to lightness, thinness and portability is facilitated.

The invention discloses a five-piece lens assembly for capturing image. It includes a first lens element with positive refractive power having a convex image-side surface and a convex object-side surface. A second lens element has a concave image-side surface. At least one of the image-side surface and the object-side surface of the first lens element and the second lens element is aspheric. An object-side surface and an image-side surface of the third lens element are aspheric and have inflection points. A fourth lens element has a concave object-side surface and a convex image-side surface. A fifth lens element has a concave object-side surface and a convex image-side surface, and both of the two surfaces are aspheric. The object-side surface of the fifth lens element has at least one inflection point and the image-side surface has at least two inflection points. The second through fifth lens elements have refractive power.

The invention discloses a six-piece optical lens for capturing image and a six-piece optical module for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens with refractive power, a second lens with refractive power; a third lens with refractive power, a fourth lens with refractive power; a fifth lens with refractive power; a sixth lens with refractive power; and at least one of the image-side surface and object-side surface of each of the six lens elements is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

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. The second lens element has refracting power. At least one of the object-side surface and the image-side surface of the third lens element is an aspheric surface. The object-side surface and the image-side surface of the fourth lens element are both aspheric surfaces.

The invention discloses a six-piece optical lens for capturing image and a six-piece optical module for capturing image. In order from an object-side surface to an image-side surface, the optical lens along the optical axis comprises a first lens with refractive power; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; a fifth lens with refractive power; a sixth lens with refractive power, and at least one of the image-side surface and object-side surface of each of the six lens elements is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

A curved optical waveguide comprising a core and a clad, characterized in that: the core shape of the curved optical waveguide has no reversal of a curvature on a halfway; and curvatures at both ends of the curved optical waveguide gradually approach zero. A curved optical waveguide comprising a core and a clad, characterized in that: the core shape of the curved optical waveguide has no reversal of a curvature on a halfway; a curvature at one end of the curved optical waveguide gradually approaches zero; and a radius of curvature at other end is finite. An optical waveguide comprising such a curved optical waveguide and an optical waveguide having a different core shape optically connected with the former, and an optical device using such a curved optical waveguide.

An optical lens for image pickup, sequentially arranged from an object side to an image side, comprising: the first lens element with positive refractive power having a convex object-side surface, the second lens element with negative refractive power having a convex object-side surface and a concave image-side surface, the plastic third lens element with positive refractive power having a concave object-side surface and a convex image-side surface with both being aspheric, the plastic fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface with both being aspheric. By such arrangements, the optical lens for image pickup satisfies conditions related to reduce the sensitivity and to shorten the total length for use in compact cameras and mobile phones with camera functionalities.

Disclosed is a projection optical system. The system comprises a light axle; a concave spherical reflecting mirror; a pair of glass prism, wherein each prism has corresponding first and second plane, the second plane contacts the first converging lens plane along the direction opposite to the light axle, and the first plane orientates to the object plane and the image plane; a converging lens group including a flat convex lens and a meniscus lens, wherein the convex surface orientates to the reflecting mirror; a telescope lens group including a concave-convex lens, a biconvex lens and a biconcave lens; a concave reflecting mirror which concave surface orientates to the object.

The invention provides an optical lens and an imaging apparatus. The optical lens sequentially comprises, from an object side to an image side, a first lens which is a crescent lens with negative focal power and is a glass aspherical lens, and of which the object side surface is a convex surface and the image side surface is a concave surface; a second lens which is provided with negative focal power, and of which the image side surface is a concave surface; a third lens which is provided with positive focal power, and of which the image side surface is convex; a fourth lens; a fifth lens glued with the fourth lens; and a sixth lens which is provided with positive focal power. According to the optical lens and the imaging apparatus, high resolution can be obtained while the miniaturizationof the optical lens is retained.

The invention discloses an optical lens group for photographing. From an object side to an image side, the optical lens group sequentially comprises a first lens with negative refractive power, a second lens with positive refractive power and a third lens with negative refractive power, wherein the image side surface of the first lens is a concave surface; the object side surface and the image side surface of the second lens are convex surfaces; and the image side surface of the third lens is a concave face, and the object side surface and the image side surface of the third lens are asphericsurfaces. The optical lens group for photographing is also provided with an aperture and an electric photosensitive element for imaging a photographed object; the aperture is arranged between the first lens and the second lens; the electric photosensitive element is arranged on the imaging surface; and three lenses with refractive power are arranged in the optical lens group for photographing. The embodiment of the invention can effectively shorten the total length of the lens, reduce the sensitivity of an optical system, and can acquire excellent imaging quality through the assembly mode of the lens group.

Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises four lens elements positioned in an order from the object side to the image side. Through controlling the convex or concave shape of the surfaces of the lens elements, the thickness of the at least one lens element, an air gap between two lens elements, and a sum of all air gaps between all four lens elements along the optical axis satisfying the relations: (T3/G₃₄)>4 and (G_aa/T3)>1, wherein T3 is the thickness of the third lens element, G₃₄ is the air gap between the third lens element and the fourth lens element, and G_aa is the sum of all air gaps between all four lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

The invention provides an optical lens and an imaging apparatus. The optical lens sequentially comprises, from an object side to an image side, a first lens which is a crescent lens with negative focal power and of which the object side surface is a convex surface, and the image side surface is a concave surface; a second lens which is provided with negative focal power, and of which the image side surface is a concave surface; a third lens which is a double-convex lens with positive focal power, and of which the object side surface is a convex surface, and the image side surface is a convex surface, wherein the absolute value of the ratio of the radius of the object side surface to the radius of the image side surface is larger than or equal to 18; a fourth lens, a fifth lens glued with the fourth lens; and a sixth lens which is provided with positive focal power. According to the optical lens and the imaging apparatus, high resolution can be obtained while the miniaturization of theoptical lens is retained.