Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Hiro

50results about How to "Shorten the projection distance" patented technology

Image display device, rear projection type screen used in image display device, fresnel lens sheet, and method of making fresnel lens sheet

A total reflecting prism portion is formed on an image generation source side of a Fresnel lens sheet which constitutes a rear projection type screen. The total reflecting prism portion is formed in an area in which the angle of incidence of a projection image projected from an optical part on the Fresnel lens sheet is at least about 40°. The total reflecting prism portion causes incident light to be outputted as output light at a predetermined output angle by a total reflection phenomenon after a first refraction phenomenon. A refracting prism portion is formed on an image monitoring side of the Fresnel lens sheet. The refracting prism portion is formed in an area opposed to the portion where the total reflecting prism portion is not formed. The refracting prism portion causes incident light to be outputted as output light at a predetermined output angle by a second refraction phenomenon.
Owner:MAXELL HLDG LTD

Projection optical system

A projection optical system satisfies the following conditional equation: 0.01<{(tan θ f1−tan θ f2)−(tan θ n1−tan θ n2)}·(β2 / β1)<0.20. If, however, the normal line and longer side directions of a screen surface are z and x directions, respectively, an incident angle component on an xz-plane with respect to the screen surface is an incident angle θ, the larger incident angle θ of a light ray in light rays incident on respective edges of the upper and lower sides of the screen through the center of a stop is θ; f while the smaller incident angle θ of the light ray is θ n; θ f1 and θ f2: the maximum and minimum incident angles θ f at the maximum and minimum projecting magnification absolute values at a focus adjustment time, respectively, θ n1 and θ n2: the maximum and minimum incident angles θ n at the maximum and minimum projecting magnification absolute values at the focus adjustment time, respectively, and β1 and β2: the maximum and minimum incident magnifications at the maximum and minimum projecting magnification values at the focus adjustment time (if the magnification is negative, the magnification value is that at the absolute maximum or minimum time), respectively.
Owner:KONICA MINOLTA OPTO

Desktop ultra-short-focus optical module

The invention discloses a desktop ultra-short-focus optical module, which belongs to the field of optical systems. The desktop ultra-short-focus optical module is used for imaging a first image projected and displayed by a projector ray machine into an amplified second image, and comprises the projector ray machine, a condensing lens, an aspherical lens, a free curved-surface lens and a free curved-surface reflector which are arranged along an optical path in a tandem manner, wherein the free curved-surface lens is composed of a convex lens and a concavo-vonvex lens. The desktop ultra-short-focus optical module provided by the invention corrects spherical aberration in a collimation and focusing system caused by the condensing lens through the aspherical lens, increases the optical path through the free curved-surface reflector and achieves short-focus projection. Moreover, the desktop ultra-short-focus optical module greatly shortens the projection distance through the ultra-short-focus technology, the projection ratio of the desktop ultra-short-focus optical module ranges from 0.1 to 0.18, and the offset of the first image relative to a main optical axis is greater than 120%.
Owner:周光磊

Liquid crystal television and liquid crystal display apparatus

InactiveUS20060221261A1Effectively be restrained from risingReduce widthTelevision system detailsMachine supportsEngineeringMechanical engineering
A liquid crystal display apparatus includes: a cabinet constituting an apparatus main body; a stand member including: a base member attached to be contained in a recess portion of a back face of the cabinet; and a pivoting member attached to the base member; an engaging portion provided at the back face and engaged with a side of a wall in hanging on the wall; and a heat radiating hole provided at the back face, wherein: the stand member supports the apparatus main body by bringing the pivoting member into an opened state, and contains the pivoting member in the back face in mounting on the wall; the pivoting member is brought into contact with the wall at a front end side of the pivoting member to form a predetermined gap between the wall and the back face in hanging on the wall.
Owner:FUNAI ELECTRIC CO LTD

Screen, fresnel lens sheet used therefor, and image display apparatus using the same

Images that are bright even on the periphery of a transmissive screen are obtained by reducing reflection loss of the screen when the screen incident angle of the image light entering the upper left and right ends of the screen increases. Incident-side prisms (10), each having at least a plane-of-incidence (c) onto which light comes in, an exit face (d) from which the light that has come in from the plane-of-incidence exits after being refracted, and a refractive face (e) on which the light that has exited from the exit face is refracted and then guided to the image-viewing side of the Fresnel lens sheet (6), are provided in the range where the incident angle of the incoming light becomes equal to or greater than approximately 40 degrees.
Owner:MAXELL HLDG LTD

Image display apparatus, and transmissive screen and reflecting mirror used for same

The present invention provides a technique suitable for making a set more compact by realizing reduction in height and reduction in depth. An image display apparatus of the present invention includes a reflecting mirror (4) for reflecting the image sent from a projection lens (2), and guiding the image to a transmissive screen (3). The reflecting-mirror (4) includes a planar mirror section (4a) for reflecting, of the entire image exiting the projection lens (2), only image portions projected onto the upper section of the transmissive screen (3), and a Fresnel mirror section (4b) with multiple reflective prisms for reflecting only image portions projected onto the lower section of the screen (3).
Owner:MAXELL HLDG LTD

Connector

A male housing (60) includes a receptacle (61) in which male tabs project. A female housing (10) includes a tower (11) with cavities (14) for accommodating terminal fittings. A front holder (13) is mountable on the tower (11) and has a front wall (31). A surrounding wall (32) projects from a peripheral edge of the front wall (31) for covering the outer peripheral surface of the tower (11). A receptacle (61) is fit on the tower (11) with the front holder (13) thereon. Inner projections (43) are provided on the inner peripheral surface of the surrounding wall (32) and project towards the outer peripheral surface of the tower (11) and outer projections (45) are provided on the outer peripheral surface of the surrounding wall (32) and project towards the inner peripheral surface of the receptacle (61).
Owner:SUMITOMO WIRING SYST LTD

Low-F number L-type short focus all high definition projection lens

The invention discloses a low-F number L-type short focus all high definition projection lens comprising a lens assembly arranged between a projection surface and a DMD chip; the lens assembly comprises a reflector, a first convex lens, a dual-bonding lens, a second convex lens, a triple-bonding lens, a third convex lens and a fourth convex lens connected in order from left to right; the lens assembly also comprises a first negative meniscus lens, a second negative meniscus lens and a dual-concave lens arranged in order from top to bottom; the first negative meniscus lens, the second negative meniscus lens and the dual-concave lens are respectively coaxially arranged along the reflected light of the pilot light on the reflector; the projection pilot light passes the fourth convex lens, the third convex lens, the triple-bonding lens, the second convex lens, the dual-bonding lens, the first convex lens, the reflector, the dual-concave lens, the second negative meniscus lens and the first negative meniscus lens, and forms an image on the projection screen; the low-F number L-type short focus all high definition projection lens can reduce the space between the image and the lens, and can simultaneously satisfy fine definition and TV distortion requirements of an aspheric projection lens.
Owner:安徽仁和光电科技有限公司

Screen, Fresnel lens sheet used for the same, and image display apparatus using the same

The present invention provides a technology that makes it possible to display high-quality images by reducing a reflection loss of the image light entering the upper left and right ends of a transmissive screen. At the image generation source side of the Fresnel lens sheet, a totally reflective prism section (10) is provided that totally reflects incident rays of light and causes the light to exit toward the image-watching side. At the image-watching side of the Fresnel lens sheet (6), a refractive prism section (11) is also provided that refracts the light entering from the totally reflective prism section (10) and causes the light to exit toward the image-watching side. The refractive prism section (11) has a roughed refractive face.
Owner:HITACHI CONSUMER ELECTRONICS CORP +1

Edge-melting seamless-splicing display system, Fresnel lens and method for simulating long-focus projector by short-focus projector

The invention relates to the field of a back projection spliced display wall, and discloses an edge-melting seamless-splicing display system. The edge-melting seamless-splicing display system comprises a curtain for projecting an image, at least two projectors which are arranged side by side on the back side of the curtain for projecting the image on the curtain, and a Fresnel lens which is arranged between the projectors and the curtain; the projector image is projected to the curtain through the Fresnel lens; melting overlap is generated on the edge of a picture and the picture of the adjacent projector; the distance between the projectors and the curtain is a formula which is as shown in the specification; and the distance between the Fresnel lens and the curtain is a formula which is as shown in the specification. Edge melting and splicing can be realized by adopting a short-focus lens projector to reduce projection distance and system thickness; and the curtain with relatively small semi-gain visual angle, high gain and high contrast ratio can be selected to expand the selectivity of the curtain, so that the overall display effect of the system can be improved.
Owner:GUANGDONG VTRON TECH CO LTD

Projection type image display apparatus

A projection type image display apparatus in which shortening of the projection distance (widening of the angle of view) and miniaturization of the projection optic system are realized is provided. It comprises, in a traveling direction of the light, an image display element, a lens group including a plurality of lenses, a first lens, a second lens, and a mirror to reflect light emitted from the second lens to be projected obliquely on a screen in this order. The refractive power of the first lens is positive and the refractive power of the second lens is negative. The first and the second lenses are moved in an interlocked relationship with each other along an optical axis of the lens group and a movement amount of the first lens is made larger than a movement amount of the second lens.
Owner:MAXELL HLDG LTD

Rear projection type projecting and teaching integrated device

The invention discloses a rear projection type projecting and teaching integrated device and mainly relates to the field of audio-visual educational equipment. The integrated device comprises a rack, a projector and a teaching board, wherein a camera slot is formed in the lower part of the rack; the projector is arranged in the camera slot and performs projection towards the upper backward direction; a reflector capable of being folded is arranged on the back side of the rack; the teaching board is arranged on the middle upper part of the rack; a transparent acrylic writing board is arranged in front of the teaching board; rear projection cloth is arranged on the inner side of the writing board; optical fibers capable of lifting are arranged on the writing board; light sources capable of enabling the optical fibers to light are arranged at the two ends of the optical fibers; and an automatic cleaning device in horizontal sliding connection with the teaching board is arranged on the front side of the teaching board. The rear projection type projecting and teaching integrated device disclosed by the invention has the beneficial effects that the device has the functions of blackboard-writing, cue mark and the like, can meet the narrow-range high-level teaching requirements and has the advantages of being capable of folding and containing, easy to clean and long in service life, the maintenance cost is reduced, and general popularization is facilitated.
Owner:ZHOUKOU NORMAL UNIV

Scanning device, laser projector, and optical device

A scanning device, a laser projector and an optical device that are capable of accomplishing a wide scanning area in a simple manner include a galvanomirror that is a scanning part scans a laser light in a two-dimensional direction. The laser light from the galvanomirror is incident on a scanning optical system. The scanning optical system includes a first lens group having a positive refracting power and a second lens group having the positive refracting power in this order from the scanning part. The galvanomirror is disposed in the vicinity of a focal position that is located at an incident side of the laser light of the first lens group. The first lens group and second lens group are disposed such that the focal position that is located at an exiting side of the laser light of the first lens group is approximately coincident with the focal position that is located at an incident side of the laser of the second lens group. An absolute value of the value that is calculated by dividing the focal distance of the first lens group by the focal distance of the second lens group is larger than 1.
Owner:SEIKO EPSON CORP

Screen, Fresnel lens sheet used for the same, and image display apparatus using the same

The present invention provides a screen suitable for reducing the longitudinal dimension of a set. The present invention includes two prism sections. One is a totally reflective prism section (10) provided at the image generation source side of a Fresnel lens sheet (6). The other is a refractive prism section (11) provided at the image-watching side of the Fresnel lens sheet. The refractive prism section (11) includes a refractive face (e) for refracting incident light and making the light exit toward the image-watching side, a plane (f) approximately parallel to the principal plane of the Fresnel lens sheet, and a connection face (g) for continuously forming the face (e) and the plane (f).
Owner:MAXELL HLDG LTD

Projection lens

A projection lens of the retrofocus type which has a long back focus, can project with a high contrast, exhibits small aberrations such as a distortion aberration and converts a light path in the inside thereof. A first lens set (0) having a negative refractive power and having light path conversion means built therein, an iris (400) and a second lens set (300) having a positive refractive power and including an aspheric lens are disposed in order from the screen side. The first lens set (0) includes a first A lens set (100) having a negative refractive power and including one or more aspheric lenses, a bending mirror (M) serving as the light path conversion means, and a first B lens set (200) having a positive refractive power. The lenses in the first A lens set have an outer shape with a portion thereof cut outside an effective light ray in a direction of the light path conversion, and the direction of the light path conversion is a direction of a shorter side of the rectangular image formation element. Where the focal length of the entire system is represented by FL, the back focus by FB, the front side focal position of the second lens set by FFP2, the distance between the iris and the second lens set by Dst, and the air converted distance on the optical axis between the first lens set and the second lens set by D2, conditional expressions [FB / FL>2.2], [0.59<|FFP2 / Dst|<0.96] and [3.75 G02B 13 / 04 G02B 13 / 18 G02B 13 / 22 25 24 0 2002 / 8 / 28 1549945 2004 / 11 / 24 1278160 2006 / 10 / 4 2006 / 10 / 4 2006 / 10 / 4 Sony Corp. Japan Sugano Yasuyuki li deshan 11038 The Patent Agency of the Chinese Council for the Promotion of International Trade (CCPIT) No.1 Waidajie, Fuxingmen, Beijing 100086 Japan 2001 / 8 / 28 258080 / 2001 2004 / 2 / 27 PCT / JP2002 / 008657 2002 / 8 / 28 WO2003 / 021326 2003 / 3 / 13 Japanese
Owner:SONY CORP

LED lens and LCD backlight screen

The present invention discloses a new LED lens and LCD backlight screen thereof. The said new LED lens includes base stand, the first protruding stand set on the base stand and the second protruding stand set on the first protruding stand; the side wall of the first protruding stand and the side wall of the second protruding stand constitute the exit surface, the side wall of the first protruding stand is outside-protruding curved surface structure; the top surface of the second protruding stand is reflective surface, and the reflective surface is conic concave structure; the bottom of the base stand is set the cylindrical hole for installing LED, and the surface of the cylindrical hole constitutes incidence surface. The present invention achieves the intention of acquiring the same brightness degree through reducing the projection distance by half compared to the present refractive optical lens with the same LED arrangement distance.
Owner:DONGGUAN OUKE OPTOELECTRONICS TECH

Process for setting the pivotal angle of the curve headlights of a vehicle

A process for setting the pivotal angle of the curve headlights of a vehicle at crossroads or intersections includes the steps of defininga projection distance for setting the pivotal angle; determiningthe expected vehicle route based on at least one criterion; limitingthe projection distance when approaching a crossroad or intersection to the distance between the vehicle and the crossroad or intersection when using an expected vehicle route that involves turning at a crossroad or into an intersection; and maintaining theprojection distance without modification when using an expected route for the vehicle that does not involve turning at a crossroad or intersection.
Owner:HELLA KG HUECK & CO

Projection system

A projection system comprises the following parts of a telephoto lens capable of independent imaging with a focal length of 70mm to 300mm; a short focus lens capable of independent imaging with a focal length of 3mm to 8mm, wherein the short focus lens is provided with an optical axis with the telephoto lens; and at least one reflective element that changes the direction of the optical axis; thereby, when the telephoto lens forms an image, the short focus lens forms an image to a predetermined position.
Owner:SUN YANG OPTICS DEV CO LTD +1

Screen, fresnel lens sheet used for the same, and image display apparatus using the same

The present invention provides a technology that makes it possible to display high-quality images by reducing a reflection loss of the image light entering the upper left and right ends of a transmissive screen. At the image generation source side of the Fresnel lens sheet, a totally reflective prism section (10) is provided that totally reflects incident rays of light and causes the light to exit toward the image-watching side. At the image-watching side of the Fresnel lens sheet (6), a refractive prism section (11) is also provided that refracts the light entering from the totally reflective prism section (10) and causes the light to exit toward the image-watching side. The refractive prism section (11) has a roughed refractive face.
Owner:HITACHI CONSUMER ELECTRONICS CORP +1

Ultra-short-focus projection optical lens and ultra-short-focus projection optical system

The invention discloses an ultra-short-focus projection optical lens and an ultra-short-focus projection optical system; the ultra-short-focus projection optical lens comprises a shell, a refraction lens group and an aspheric reflector, wherein the refraction lens group and the aspheric reflector are mounted in an inner cavity of the housing and are sequentially and fixedly arranged in a refraction projection direction. An optical axis is correspondingly formed in the shell between the refraction lens group and the aspheric reflector, the refraction lens group sequentially comprises a first spherical lens, a second aspheric lens, a third spherical lens, a fourth spherical lens, a fifth spherical lens, a sixth spherical lens, a diaphragm, a seventh spherical lens, an eighth aspheric lens, aninth spherical lens, a tenth aspheric lens, an eleventh aspheric lens and a twelfth spherical lens from the object side to the image side. According to the technical scheme provided by the invention, at least twelve refraction lenses and one aspheric reflector are arranged, so that the requirements on the projection lens in the aspects of processing and adjustment precision are relatively low.
Owner:中山联合光电研究院有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products