36results about How to "Avoid vignetting" patented technology

An EUV optical projection system includes at least six reflecting surfaces for imaging an object (OB) on an image (IM). The system is preferably configured to form an intermediate image (IMI) along an optical path from the object (OB) to the image (IM) between a secondary mirror (M2) and a tertiary mirror (M3), such that a primary mirror (M1) and the secondary mirror (M2) form a first optical group (G1) and the tertiary mirror (M3), a fourth mirror (M4), a fifth mirror (M5) and a sixth mirror (M6) form a second optical group (G2). The system also preferably includes an aperture stop (APE) located along the optical path from the object (OB) to the image (IM) between the primary mirror (M1) and the secondary mirror (M2). The secondary mirror (M2) is preferably concave, and the tertiary mirror (M3) is preferably convex. Each of the six reflecting surfaces preferably receives a chief ray (CR) from a central field point at an incidence angle of less than substantially 15°. The system preferably has a numerical aperture greater than 0.18 at the image (IM). The system is preferably configured such that a chief ray (CR) converges toward the optical axis (OA) while propagating between the secondary mirror (M2) and the tertiary mirror (M3).

A photographing optical lens assembly, sequentially arranged from an object side to an image side, comprising: the first lens element with negative refractive power having a convex object-side surface and a concave image-side surface, the second lens element with positive refractive power having bi-convex surfaces, the third lens element with positive refractive power having a convex object-side surface, at least one aspherical surface and at least one inflection point on at least one optical surface. Additionally, the photographing optical lens assembly comprises a stop and satisfies condition such as 0.75<SL / TTL<1.1, wherein SL is the axial distance from the stop to the image plane, TTL is the axial distance from the object-side surface of first lens element to the image plane. By such arrangements, the photographing optical assembly can effectively correct the aberration and obtain superior image quality.

A stereomicroscope including a stereoscopic main observer beam path having a main observer zoom system, a stereoscopic co-observer beam path having a co-observer zoom system, and a main objective common to the main observer beam path and the co-observer beam path. The co-observer beam path is coupled out from the main observer beam path via a geometrical beam splitter arranged between the main objective and the main observer zoom system, wherein in the co-observer beam path the co-observer zoom system succeeds the geometrical beam splitter and is constructed from lenses having dimensions such that both a first and a second stereoscopic partial beam of the co-observer beam path in each case pass through the lenses.

An EUV optical projection system includes at least six reflecting surfaces for imaging an object (OB) on an image (IM). The system is preferably configured to form an intermediate image (IMI) along an optical path from the object (OB) to the image (IM) between a secondary mirror (M2) and a tertiary mirror (M3), such that a primary mirror (M1) and the secondary mirror (M2) form a first optical group (G1) and the tertiary mirror (M3), a fourth mirror (M4), a fifth mirror (M5) and a sixth mirror (M6) form a second optical group (G2). The system also preferably includes an aperture stop (APE) located along the optical path from the object (OB) to the image (IM) between the primary mirror (M1) and the secondary mirror (M2). The secondary mirror (M2) is preferably concave, and the tertiary mirror (M3) is preferably convex. Each of the six reflecting surfaces preferably receives a chief ray (CR) from a central field point at an incidence angle of less than substantially 15°. The system preferably has a numerical aperture greater than 0.18 at the image (IM). The system is preferably configured such that a chief ray (CR) converges toward the optical axis (OA) while propagating between the secondary mirror (M2) and the tertiary mirror (M3).

An optical lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth 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 third lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof, wherein both of the surfaces thereof are aspheric. The fourth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fourth lens element has at least one convex shape in an off-axis region thereof, and both of the surfaces thereof are aspheric. The optical lens system has a total of four lens elements with refractive power.

A pop-up flash of a camera includes a slidable member mounted to a camera body, the slidable member being movable between a retreated position and an advanced position in front of the retreated position; and a flash unit supported by the slidable member to be movable between a retracted position, in which the flash unit is accommodated in the camera body, and a fully-lifted position in which the flash unit projects from the camera body. The flash unit moves from the retracted position to the fully-lifted position when the slidable member moves from the retreated position to the advanced position.

The invention relates to the technical field of lenses. The invention discloses an optical imaging lens. The optical imaging lens sequentially comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, the first lens is a convex-concave lens with negative refraction; the second lens is a convex planeor convex lens with positive refractive index; the third lens is a concave-convex lens with a positive refractive index; the fourth lens is a convex lens with positive refractive index; the fifth lensis a concave-convex lens with a negative refractive index, and the fourth lens and the fifth lens are glued with each other; and the refractive index temperature coefficient of the first lens is a positive value. The optical imaging lens has the advantages of high resolution, large light transmission, high relative illuminance, good chromatic aberration and aberration correction, small temperature drift and low cost.

The display apparatus for vehicles is provided with: a display unit (3) disposed on an upper part of an instrument panel (2) located under a front glass (1) within the vehicle compartment; an enlarging lens (4) extending vertically from the upper part of the instrument panel (2) and disposed closer to the rear of the vehicle than the display unit (3) such that a display on the display unit (3) can be shown as enlarged to the driver; and an opaque light blocking wall (7) extending from outer edge portions of the display unit (3) to at least near left and right positions (M, N) where first lines (LL1, LR1) connecting the left and right eyes of the driver with the outer edge portions on the corresponding sides of the enlarging lens (4) intersect a second line (L2) extending from the display unit (3) in the vehicle width direction.

The invention discloses an optical lens, a camera module and electronic equipment. The optical lens comprises from an object side to an image side along an optical axis: a first lens, wherein the first lens has positive refractive power, and the object-side surface and the image-side surface of the first lens are convex and concave surfaces near the optical axis; a second lens with negative refractive power, wherein the second lens has an object-side surface and an image-side surface being convex and concave in a paraxial region thereof; a third lens with positive refractive power , wherein the third lens has an object-side surface being convex in a paraxial region thereof; a fourth lens which has an object-side surface being concave in a paraxial region thereof; a fifth lens with negative refractive power, wherein the fifth lens has an object-side surface and an image-side surface being concave and convex in a paraxial region thereof; a sixth lens with positive refractive power; a seventh lens, wherein the object side surface of the seventh lens is a convex surface at the optical axis; and an eighth lens with negative refractive power, wherein the eighth lens has an image-side surface being concave in a paraxial region thereof. The optical lens satisfies the following relational expression: f / EPD is more than or equal to 1.62 and less than or equal to 2.16. The optical lens, the camera module and the electronic equipment provided by the embodiment of the invention have the characteristics of large aperture and large image plane, and can realize high-quality imaging.

The field of the invention is that of optical devices allowing the superposition of an electronic image on an image coming from an external scenery. The subject of the invention is an optical device for superposing images, designed to be positioned in front of an optical module comprising at least an objective and a photosensitive surface positioned in the focal plane of said objective. The device comprises an image source, an optical relay and an optical combiner formed of two optical parts assembled via an approximately plane common face including a weakly reflective coating. The combiner has the general form of a plate with plane parallel faces, the common face being inclined at around 45 degrees to said plane faces. It has an entrance face and a opposing face that are approximately perpendicular to the plane faces, the opposing face having approximately the form of a reflecting spherical surface. This device applies in particular to night vision goggles where, when the optical combiner is placed in front of the objective of a goggles body, it allows superposition of an electronic image on the external scenery while introducing marginal attenuation.

The present invention relates to a camera module mounted in a mobile terminal, comprising: a first lens group having a first lens, which has a positive (+) refractive power, and a second lens, which has a negative (−) refractive power, in order from the object side, wherein the first and second lenses are integrally formed through a first lens barrel; a variable aperture for controlling the quantity of light incident into an optical system; and a second lens group having a third lens having a negative (−) refractive power, a fourth lens having a positive (+) refractive power, and a fifth lens having a positive (+) refractive power, wherein the third to fifth lenses are integrally formed through a second lens barrel.

The invention discloses an optical image system group, which comprises ten lenses. The ten lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens from the object side to the image side along an optical path. Each of the ten lenses has an object-side surface facing the object-side direction and an image-side surface facing the image-side direction. The second lens element has negative refractive power. The tenth lens has negative refractive power, and at least one of the object-side surface of the tenth lens and the image-side surface of the tenth lens has at least one inflection point. When specific conditions are met, the optical image system group can meet the requirements of miniaturization and high imaging quality at the same time. The invention also discloses an image capturing device with the optical image system group and an electronic device with the image capturing device.

The invention relates to a fabric defect detection method based on light field camera depth information extraction, the method can be used in the field of fabric detection, and is a method for detecting fabric defects from a 3-dimensional space. This method utilizes a light field camera to generate a multi-view image sequence of the target fabric. By substituting the slope for the estimated depth value of the disparity, the depth map is obtained by using the method of sub-pixel offset. In order to avoid the interference of the vignetting effect of the microlens of the light field camera, the weakly affected area is extracted, and the noise reduction process is performed on this part. The noise reduction of the present invention uses an image self-adaptive window filter noise reduction method. Effectively avoid the error caused by too large and too small median filter window. Finally, binarization is performed to obtain a segmentation map. By using the method of the invention to process the fabric, the defective part of the fabric can be effectively detected.