36results about How to "Avoid vignetting" patented technology

A projection objective formed from six mirrors arranged in a light path between an object plane and an image plane is provided. The projection objective, in some examples, is characterized by having a physical distance between the vertexes of adjacent mirrors that is large enough to allow for the six mirrors to have sufficient thickness and stability properties to prevent surface deformations due to high layer tensions. In some embodiments, mirror thickness are such that surface deformations are prevented with mirrors having layer tensions lower than 350 MPa. Mirror surfaces may comprise multilayer systems of Mo / Be or Mo / Si layer pairs. In some examples, the physical distance between a vertex of the third mirror and a vertex of the sixth mirror (S3S6) satisfies the following relationship: 0.3×(a used diameter of the third mirror S3+a used diameter of the sixth mirror S6)<S3S6. In some examples, a ratio of a physical distance between a vertex of the first mirror and a vertex of the third mirror (S1S3) to a physical distance between the vertex of the first mirror and a vertex of the second mirror (S1S2) is within the range of: 0.5<S1S3 / S1S2<2. In some examples, the physical mirror surfaces of the mirrors have a rotational symmetry with respect to a principal axis (PA). In some examples, all physical mirror surfaces are aspherical. In some examples, at most five physical mirror surfaces are aspherical. Other examples are provided, along with microlithography projection exposure apparatuses and processes for producing a microelectronic device.

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).

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.

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 lens includes an aperture stop having a predetermined aperture, a first lens having a positive refractive power and a convex surface facing the object side, a second lens having a positive refractive power and aspherical surfaces on both sides, the object-side aspherical surface being concave, and a third lens having a negative refractive power and aspherical surfaces on both sides, the object side surface being convex. The aperture stop and the first, second, and third lenses are arranged in order from the object side toward the image-plane side. With such a three-unit, three element lens configuration, a proper back focus is ensured, aberrations are properly corrected, and the total lens length and thickness of the photographing lens are reduced. The photographing lens can be suitably applied to high-resolution image pickup devices with a million pixels or more.

An illumination apparatus for using a beam emitted from a light source to illuminate an object area includes a condensing optical system for condensing the beam emitted from the light source, and a reflection type optical integrator located between the condensing optical system and the object area, the optical integrator having an m-gonal (where m is an even number) sectional shape, forming multiple pairs of opposing reflection surfaces, and reflecting the beam between the multiple pairs of opposing reflection surfaces, wherein a length L in an axial direction of the reflection type optical integrator meets the following equations: R=Φ / [tan {sin−1(sin θ / n)}]; and C×(A−0.1)×R≦L≦C×(A+0.1) X R, where n is a refractive index of a medium between the reflection surfaces, Φ is a distance between the reflection surfaces, θ is an angle of divergence when the beam emitted from the condensing optical system enters the reflection type optical integrator, C is a constant determined in relation to the sectional shape of the reflection type optical integrator, and A is a natural number.

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.

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.

An imaging optical system includes three reflecting mirrors having first to third reflection surfaces and is configured, such that in an XYZ orthogonal coordinate system using an optical axis at the center of the field of view as Z-axis, the optical axis at the center of the field of view and an optical axis of an image plane are in parallel to each other by changing orientation of the optical axis in a YZ section while maintaining the orientation of the optical axis in an XZ section. At least one of the three reflection surfaces is rotationally asymmetric. Assuming that along the path of the beam traveling along the optical axis at the center of the field of view a distance between the second reflection surface and the third reflection surface is L2, a distance between the third reflection surface and the image plane is L3 and fy1 and an equivalent F-number of the imaging optical system is represented as Fno, the relational expression0.5<Fno(L2 / L3)<1.3is satisfied.

The invention relates to a fabric flaw detection method based on light field camera depth information extraction. The fabric flaw detection method can be applied to the field of fabric detection and is a method for detecting fabric flaws from a three-dimensional space. The fabric flaw detection method utilizes a light field camera to generate a multi-view image sequence of a target fabric, replaces a parallax estimation depth value by a slope, and obtains a depth map by using a sub-pixel offset method. In order to avoid vignetting effect interference of the micro lens of the light field camera, the fabric flaw detection method extracts a weak influence area, and performs noise reduction processing on the weak influence area. According to the fabric flaw detection method, an image adaptivewindow filtering noise reduction method is used for noise reduction; errors caused by too large and too small median filtering windows are effectively avoided; and finally, binarization is carried outto obtain a segmentation image. When the fabric flaw detection method is used for treating the fabric, the defective part of the fabric can be effectively detected.

The invention discloses an optical system of a large-field wide-band airborne differential absorption imaging spectrometer, which comprises a front telescopic imaging system and an Offner-Littrow spectral imaging system, wherein the front telescopic imaging system mainly comprises a front ultraviolet objective lens; the Offner-Littrow spectral imaging system specifically comprises an optical filter, an incident slit, a convex grating and a concave reflector; the front ultraviolet objective lens consists of three independent front lenses according to detection wavebands (200-276 nm, 276-380 nm,380-500 nm), and the field of view of each lens reaches 40 degree. The Offner-Littrow spectral imaging system is also independently composed of three spectrometers according to the above wavebands. Each waveband light is focused from a front lens and enters the incident slit of the spectrometer, three groups of spectra to be detected enter the spectrometer through the optical filter at the rear end of the incident slit of the spectrometer, the corresponding spectral information is reflected by the concave reflector and then is split by the convex grating, and the light path is turned to the concave reflector and then focused on a detector. According to the optical system of the large-field wide-band airborne differential absorption imaging spectrometer, the measurement accuracy is ensured, and the whole optical system is compact in size.

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 operating microscope has a main objective (1) that extends along an objective plane and is penetrated by a binocular main observer beam path and a binocular co-observer beam path. The binocular main observer beam path has two main observation pupils (3a, 3b) in the objective plane with centers on a first straight line (7). The binocular co-observer beam path has two co-observation pupils (5a, 5b) in the objective plane with centers on a second straight line (9). The first and second straight lines (7, 9) intersect. The co-observer beam path can be displaced with respect to the main observer beam path so that the angle between the second and first straight line (9, 7) changes. The center point (6) between the co-observation pupils (5a, 5b) in the objective plane displaces when there is a change in the angle between the second and first imagined straight lines (9, 7).

The invention discloses a display device. The display device comprises a display panel, a frame and a backlight module; a backboard is arranged in the frame; the backlight module comprises a light source used for casting light on the display panel; the light source comprises a light bar where a plurality of light emitting units are distributed; the light bar is fixed to the backboard, and the light bar and the backboard are in the same shape, so that part of light emitted by the light emitting units, close to both ends of the backboard, on the light bar is deflected to the corner of the display panel. By means of the display device, the problem that the corner of the display panel becomes a vignette can be avoided, the display effect is improved, and display and observation are better facilitated.

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.

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 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 invention discloses an optical image-taking lens. The optical image-taking lens comprises four lenses, the four lenses are successively a first lens having positive focal power, a second lens having a negative focal power, a third lens having a positive focal power and a fourth lens having a negative focal power from the object side to the image side, and an optical face of the image side is provided with at least one inflection point. Each lens comprises at least one aspheric surface. The optical image-taking lens further comprises a diaphragm disposed between a photographed object and the second lens and an image sending assembly disposed on an imaging surface. A distance of the first lens from an object side optical surface to the imaging surface on an optical axis is TTL, an overall optical system focal length of the optical image-taking lens is f, a vertical distance between the optical axis and an intersection point projected on the imaging surface by a light ray which passes through the center of the diaphragm at an incident angle relative to the optical axis from an object side direction is Y1, and the optical image-taking lens meets a relational expression: 1.3<TTL / f<1.8, and 0.8<Y1 / f<0.98. The optical image-taking lens has the good resolving power, can reduce the total length, and then can be applied to a camera, a mobile phone camera and the like which have good photographing purpose use demand.

The invention discloses a display device. The display device comprises a display panel, a frame, and a backlight module; a backboard is arranged in the frame; the backlight module comprises a light source used for casting light on the display panel; the light source comprises a light bar on which a plurality of light emitting units are distributed; the light bar is fixed to the backboard and oppositely arranged on the backboard, so that part of the light emitted by the light emitting units, close to both ends of the backboard, of the light bar deviates to corners of the display panel. According to the display device, the problem that the corners of the display panel become dark corners can be avoided, the display effect is improved, and display and observation are better facilitated.

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 provides an optical splicing imaging device which comprises a primary imaging optical system and two secondary imaging optical systems; wherein a light splitting element is arranged on a primary image surface of the primary imaging optical system; an image formed by the primary imaging optical system on the primary image surface is divided into two parts after being reflected by the light splitting element and respectively enters two secondary imaging optical systems to carry out secondary imaging; wherein the light splitting element is provided with two reflecting surfaces which are perpendicular to each other, an included angle of 45 degrees is formed between each of the two reflecting surfaces and an incident light beam, and the intersection of the two reflecting surfaces is located on a primary image surface. According to the invention, seamless splicing of the field of view is achieved in an optical splicing mode without field-of-view blind area; so that the energy loss can be reduced to the minimum through arrangement of the light splitting element, and therefore the requirement for the relative aperture of an optical system is lowered, and the machinability of the lens is guaranteed.

The invention relates to a light guide plate, a backlight module and a display device. The light guide plate comprises a light emitting surface, and the light emitting surface comprises a convex lens, a plurality of first microstructures and a plurality of second microstructures. The convex lens is located in the center of the light-emitting face, the first microstructures are of an annular structure, the multiple first microstructures are concentric and surround the periphery of the convex lens, and the second microstructures are of an arc-shaped structure and surround the peripheries of the multiple first microstructures. The first microstructures and the second microstructures are respectively provided with a refracting surface used for deflecting transmitted light, and the refracting surface of the second microstructure at least located on the outermost side is provided with a plurality of strip-shaped protruding structures.