72results about How to "Excellent aberration correction" patented technology

The invention discloses an optical image capture battery of lens, an image capture apparatus and an electronic apparatus. The optical image capture battery of lens includes, from the object side to the image side: a first lens with refraction power, a second lens with positive refraction power, a third lens with refraction power, a fourth lens with refraction power, a fifth lens with refraction power, and a sixth lens with refraction power, wherein the object side surface of the first lens is a convex surface at the position being close to an optical axis, wherein the object side surface; the image side surface of the third lens is a concave surface at the position being close to the optical axis; the image side surface of the fourth lens is a concave surface at the position being close to the optical axis, and both the object side surface and the image side surface of the fourth lens are aspheric surfaces; the object side surface of the fifth lens is a concave surface at the position being close to the optical axis; and the image side surface of the sixth lens is a concave surface at the position being close to the optical axis, both the object side surface and the image side surface of the sixth lens are aspheric surfaces, and the image side surface is provided with at least one convex surface at the position of an off axis. The invention also discloses an image capture apparatus with the optical image capture battery of lens and an electronic apparatus with the image capture apparatus. Through the above configuration, the optical image capture battery of lens, the image capture apparatus and the electronic apparatus can alleviate the situation of deflection of light ray when initial incidence of the light ray into the battery of lens so as to control generation of aberrations and reduce the sensitivity of the optical image capture battery of lens and further improve the yield rate for production.

A projection optical system for magnifying an image on a primary imaging plane onto a secondary imaging plane, the projection optical system comprising: a first optical system for forming an intermediate image; and a second optical system including an arrangement a concave reflective surface between the intermediate image and the secondary imaging plane. The first optical system includes first and second groups having negative and positive refractive powers, respectively; an aperture; and a third group having positive refractive power, arranged in order from the intermediate image. Surfaces of the first and second optical systems have rotational symmetry with respect to the optical axis. A ray traveling from the center of the primary imaging plane to the center of the secondary imaging plane intersects the optical axis, is reflected from the reflective surface, intersects the optical axis again, and reaches the secondary imaging plane. The following conditional expressions are satisfied: 0.5<φ1 / φ2<3, 1<AST / ASS<5, |AST| / L12<1, and -3<K_rel.

The invention relates to an economical high resolution day and night fixed focus lens. A front group with a negative focal power and a back group with a positive focal power are orderly arranged along a light incident direction. The front group is orderly provided with a positive crescent lens A-1 and a negative crescent lens A-2. The focal length fA of the front group is -21.996mm. The back group B is orderly provided with a gluing group with the closed connection of a biconcave lens B-1 and a biconvex lens B-2 and a biconvex lens B-3, and the focal length fB of the back group is 6.792mm. According to the lens, the total number of lends is reduced in the condition of ensuing performance, besides the high resolution, large relative aperture, day and night confocal performance, low distortion and short shooting distance of an 8mm fixed focal lens, the economical high resolution day and night fixed focus lens is more economical and is generally used in a dark or no-light place with the requirement of high definition picture quality such as a road, a warehouse, an underground parking place, a bar, a pipe, a corridor and a park, and the economical high resolution day and night fixed focus lens is a mainstream product of a micro monitoring camera system.

Provided are a lens barrel and an image pickup device, wherein the lens barrel (1) comprises: a fixed frame (2); a cam frame (5) supported by the fixed frame (2) so as to be rotationally movable in a photographing optical axis direction between a forward movement end and a backward movement end which are each defined in the photographing optical axis direction; a shutter frame (30) which holds a shutter and moves in the photographing optical axis direction in a rotation restricted state, through the rotation of the cam frame (5); a third group frame (10) which holds the third group lens (23) and fixed as fitting, at least in part thereof on the object side, in the inner peripheral side of the shutter frame (30); and a a second group frame (11) which holds the second group lens (22), moves in the photographing optical axis direction in a rotation restricted state, through the rotation of the cam frame (5), and, upon the cam frame (5) being positioned at the backward movement end, fits in, at least in part thereof on the image side, an inner peripheral side of the shutter frame (30).

An optical lens assembly for image taking, 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 surfaces and a concave image-side surface; the third lens element with positive refractive power having a convex image-side surface; the fourth lens element with refractive power having two aspheric optical surfaces; the fifth lens element with refractive power having a concave object-side surface and both aspheric optical surfaces; an image sensor disposed on an image plane and a stop provided for imaging a photographed object; specific relations being satisfied. Thereby, the optical lens assembly for image taking has good aberration correction, and can shorten the total length for use in compact cameras and mobile phones requiring high resolution.

The invention discloses a photographing lens assembly, including a total of eight lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The eighth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof. At least one lens element of the photographing lens assembly has at least one lens surface having at least one inflection point. When specific conditions are met, the photographing lens assembly can meet the requirements of miniaturization and high imaging quality at the same time. The invention further discloses an image capturing unit with the photographing lens assembly and an electronic device with the image capturing unit.

The invention discloses a medium wave infrared optical system which comprises a double aperture objective lens group, a zoom group, a focusing lens group, a mirror group and a secondary imaging rear group. The double aperture objective lens group comprises a first main objective lens group lens, a second main objective lens group lens, a first short focus main objective lens group lens, a second short focus main objective lens group lens, a short focus reversing mirror and a short focus fixed lens. The zoom group is composed of a short focus zoom mirror which can rotate about a rotation center, a short focus zoom lens, a first middle focus zoom lens and a second middle focus zoom lens. The focusing lens group is a focusing lens which can move back and forth. The mirror group is composed of first and second mirrors can fold an optical path by 180 degrees. The secondary imaging rear group is composed of a first rear group lens, a second rear group lens and a third rear group lens. The optical system uses a double-aperture design technology to realize third gear variable focal length of 18 / 62.5 / 250mm. The short focus horizontal view field is up to 30 degrees, which expands the equipment observation range.

The invention discloses an endoscopic image-capturing objective lens optical system comprising a first lens group, a diaphragm and a second lens group from an object side to an image side. The first lens group has positive power and comprises a first lens and a second lens. The first lens is made of a plastic material and has at least one spherical surface. The second lens group comprises a third lens having positive power. The endoscopic image-capturing objective lens optical system satisfies a following conditional expression: f / H(L1r1) < 1.5; H (L1r1) / IMH < 1.5; N1 > 1.7; wherein f is the focal length of the endoscopic image-capturing objective lens optical system, H(L1r1) refers to the height of a main light ray corresponding to the maximum image height during conventional observation passing through a surface of the object side of the first lens group, IMH refers to the maximum image height on a corresponding chip light-sensitive surface during conventional observation, and N1 is the refractive index of the first lens. The endoscopic image-capturing objective lens optical system has a small diameter, a wide field of view, and is capable of improving a close-up shot effect.

The invention discloses an endoscopic image-capturing objective lens optical system comprising a first lens group, a diaphragm and a second lens group from an object side to an image side. The first lens group has positive power and comprises a first lens and a second lens. The second lens group comprises a third lens having positive power. The first lens, the second lens, and the third lens are all made of plastic materials. The endoscopic image-capturing objective lens optical system satisfies a following conditional expression: f / H(L1r1) < 4; H (L1r1) / IMH < 0.5; wherein f is the focal length of the endoscopic image-capturing objective lens optical system, H(L1r1) refers to the height of a main light ray corresponding to the maximum image height during conventional observation passing through a surface of the object side of the first lens group, and IMH refers to the maximum image height on a corresponding chip light-sensitive surface during conventional observation. The endoscopic image-capturing objective lens optical system has a small diameter, a wide field of view, good aberration correction and low cost.

Provided is an optical system, which can pickup an image having a wide photographing field angle by a simple constitution, is small and has excellently corrected aberration and high resolution. The optical system is an imaging system for imaging a recessed object surface (4), which is rotationally-symmetric about a center axis (1), on a flat image surface (5) orthogonally intersecting with the center axis. The optical system has the refraction element (3) composed of a transparent medium provided with a first transmitting surface (31), which is rotationally-symmetric about the center axis (1) and is arranged along the object surface (4), and a second transmitting surface (32), which is rotationally symmetric about the center axis (1). The transparent medium has a refractive index larger than 1. In the optical system wherein a luminous flux from the object surface (4) is focused on the image surface (5) through the refraction element (3), the second transmitting surface (32) has a recessed surface facing the image surface (5), and a negative power is provided within a cross-section which includes the center axis (1), at a position off the center axis (1).