81results about How to "Reduce light energy loss" patented technology

The invention discloses a holographic waveguide display device and belongs to the technical field of wearable display. The holographic waveguide display device comprises a micro displayer, a collimating lens, a diaphragm, a waveguide, an inlet coupling diffraction optical element and an outlet coupling diffraction optical element. The inlet coupling diffraction optical element comprises a reflection body holographic grating and a sub-wavelength one-dimensional metal nanometer grating. One side of the reflection body holographic grating is closely connected to the waveguide, and the sub-wavelength one-dimensional metal nanometer grating is arranged on the surface of the other side of the reflection body holographic grating. Photons penetrating through the reflection body holographic grating can be coupled into a surface plasma mode through the sub-wavelength one-dimensional metal nanometer grating, and thus the photons can enter the reflection body holographic grating again to be diffracted and enter the waveguide. Compared with the prior art, by means of the holographic waveguide display device, the diffraction efficiency of TM light can be improved on the premise of ensuring the high diffraction efficiency of the TE light, so that the total light energy utilization rate of the holographic waveguide display device is increased, and meanwhile stray light in transmission is effectively suppressed.

The invention discloses an optical fiber bundle spectrometer, which comprises an optical fiber bundle, a dispersion element and an array detector element, wherein an output end of the optical fiber bundle is arranged into an optical slit, is fixedly arranged on an incident light path of the dispersion element, and is directly used as an incident slit of the spectrometer, the energy loss of a sampling optical signal can be greatly reduced, the instrumental sensitivity is greatly improved, as a result, the nonlinearity, the dark noise and the stray light error of the instrument are reduced, and higher measurement accuracy and quicker measurement velocity are obtained. Through orderly arranging a two-dimensional array detector and optical fiber units at the input end and the output end of the optical fiber bundle and connecting a plurality of sets of sub-fiber bundle spectrometer in parallel, the two-dimensional image spectra measurement and multi-purpose spectral measurement can be realized through the optical fiber bundle spectrometer, so the optical fiber bundle spectrometer has the advantages of dispensing with mechanical scanning or switching mechanism, and having quick measurement speed, high precision, flexible configuration, wide application range and the like.

A light emitting diode (LED) packaging structure includes a package body, a lead frame and a reflective wall. The package body includes a chip accommodating space for an LED chip, and a portion of the lead frame is exposed to the chip accommodating space. The reflective wall is connected with the lead frame and extendedly bends from the lead frame to cover a sidewall of the accommodating space so that rays of the LED chip can reflect from the reflective wall mostly.

The invention relates to a packaging method for improving the LED outer quantum efficiency and a LED packaging structure. The lighting chip is installed at the bottom of the bracket reflective cup; the electrode of the lighting chip is guided to the bracket electrode; the fluorescent colloid is cast in the bracket reflective cup for solidifying the chip; a plurality of miniature structures are formed on the lighting surface of the colloid via the transparent glue mixed miniature spherical grains. The LED packaging structure comprises a bracket reflective cup, a lighting chip packed at the bottom of the bracket reflective cup, a fluorescent colloid cast in the bracket reflective cup; the fluorescent colloid is formed with a plurality of miniature structures on the lighting surface. In that way, the invention can reduce the planar full-reflective effect for the fluorescent colloid and the lost of the light energy, and the invention also can enhance the LED light efficiency, in the other words enhancing the outer quantum efficiency.

The invention relates to a light aging resistant photodiffusion polycarbonate composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 700-900 parts of polycarbonate aggregate, 100-300 parts of polycarbonate powder, 0.5-5 parts of photodiffusion agent, 2-8 parts of light stabilizer, 1-5 parts of antioxidant and 0.5-2 parts of processing agent. The light aging resistant photodiffusion polycarbonate composite material is prepared from the raw materials in high-speed mixing, extruding and pelletizing manners. The light aging resistant photodiffusion polycarbonate composite material disclosed by the invention has the advantages of being good in processing formability, good in light aging resisting performance, good in light transmittance and haze, and the like.

The invention provides a high-power semiconductor laser beam combining method. By the method, a laser beam combining light source with fine uniformity, high energy density and half-sized beam diameter can be obtained. The high-power semiconductor laser beam combining method includes the steps: respectively performing fast axis and slow axis collimation for laser beams emitted by semiconductor laser units of a semiconductor laser stack; enabling the collimated laser beams to pass a beam combining device, horizontally emitting parts of the laser beams along an incident optical axis or after double refraction, vertically shifting parts of the laser beams, enabling the other parts of the laser beams to be parallel to the horizontally emitted laser beams after two-time total reflection, and emitting the laser beams in a plug-in beam combining manner.

The invention discloses an imaging spectrometer beam splitting system based on a free-form surface. The system is composed of an entrance slit, a free-form surface collimation reflector, a plane diffraction grating, a free-form surface imaging reflector and an image surface detector. The imaging spectrometer beam splitting system is characterized in that the high-freedom-degree non-rotation-symmetrical free-form surface is used in cooperation with the plane grating which is high in performance and mature in technology, and the beam splitting system which is simple and compact in structure, low in aberration, low in distortion and high in efficiency is realized. In the system, the mode that the hole diameter deviates from the axis is adopted to achieve the purpose of no light obstruction, relative angle rotation does not exist among all optical elements, installation and adjustment can be realized conveniently and easily, and the development time can be shortened. The beam splitting system based on the free-form surface realizes good spectral imaging at the 8-12.5-micrometer long wave infrared spectrum, and on the premise that it is guaranteed that the system is simple and compact, spherical aberration, comatic aberration, astigmatism, spectral distortion, spectral line bending and the like are well corrected. The imaging spectrometer beam splitting system can be applied to the field of aerospace and aviation hyperspectral imaging.

The invention relates to a negative phototropic module which comprises a cold-cathode lamp and a light guiding plate, wherein the light guiding plate comprises a light incidence side, a light exit side and a reflecting side which is opposite to the light exit side; the cold-cathode lamp is positioned on the light incidence side of the light guiding plate; at least one surface of the cold-cathode lamp tube and the light incidence side of the light guiding plate form a nanometer silicon dioxide particle layer.

The invention provides a handheld photoacoustic imaging probe and relates to the technical field of photoacoustic imaging. The probe comprises an ultrasonic probe and a light source for emitting exciting light. The exciting light is coupled to a first fiber bundle. The tail end of the first fiber bundle is branched into a first fiber sub-bundle and a second fiber sub-bundle. The tail end of the first fiber sub-bundle and the tail end of the second fiber sub-bundle are provided with a first rectangular structure and a second rectangular structure, respectively, located on two sides of the ultrasonic probe; light outgoing directions of the sub-bundles are parallel to a detection direction of the ultrasonic probe. A coupling module is disposed at the lower end of the ultrasonic probe. Two sides of the coupling module are provided with light reflecting structures corresponding to the first and second rectangular structures, respectively. Light emitted from the first and second rectangular structures is reflected by the light reflecting structures and gathers at the bottom of the coupling module, forming a rectangular light spot which irradiates an object to be detected, and photoacoustic signals are excited and finally detected by the ultrasonic probe.

The invention discloses a design method for an optical lens for an LED automobile front fog lamp. A cavity for holding an LED light source is formed in the lens. The LED light source emits light right towards the cavity of the lens. The light from the central portion of an LED firstly penetrates through a spherical surface on the top of the inner wall of the cavity, and the direction of the light does not change when the light enters the lens; then the light is refracted on a free-form surface in the middle of the top of the outer side of the lens to form emergent light irradiating an illumination surface. The light from the edge portion of the LED is firstly refracted on a columnar surface of the inner wall of the cavity of the lens to enter the lens, then is totally reflected on a total reflection free-form surface on the outer side of the lens, and finally is refracted on a ring plane of the top edge of the lens to irradiate the illumination surface. The lens is simple and compact in structure, small in size, high in light energy utilization rate and low in glare effect, and the light distribution requirement of the automobile front fog lamp at the 'F3' level in the Economic Commission for Europe Regulation 19 Revision 15 (ECE R19 Rev15) is met.

The invention relates to an airport taxiway sideline lamp, comprising an LED light source and a lens arranged above the LED light source, wherein the LED light source is a blue LED light source, and the lens is a solid lens; the lens comprises a base platform and a conical part upwards extending out of the base platform, one side of the base platform, which is just opposite to the LED light source, is provided with a concave conical surface which is provided with multiple circles of concentric insection rings coaxial with the conical surface. Because no reflector is arranged in the airport taxiway sideline lamp, the light energy loss caused by the absorption of the reflector is reduced, and the structure of the lamp is simplified ; in addition, because the blue LED light source is directly adopted, and no additional light filter is arranged, the structure of the lamp is simplified; and moreover the LED light source has the advantages of high light-emitting efficiency, long service life and the like.

The invention provides a light guide plate. The light guide plate includes a light outlet surface, a light guide plate bottom face and at least one light inlet surface; the light outlet surface is opposite to the light guide plate bottom face, and the light inlet surface is connected to the light outlet surface and the light guide plate bottom face; the light guide plate is further provided with a hollow cavity, and the hollow cavity is provided with a hollow cavity bottom face closing to the light guide plate bottom face; a reflective sheet is arranged in the hollow cavity of the light guide plate, the reflective sheet is fit to the wedge-shaped hollow cavity bottom face, and one side of the reflective sheet facing to the light outlet surface is provided with a reflective bump. The light guide plate is low in light energy loss, low in manufacturing cost, and able to improve the light brightness. The invention further provides a backlight module and a liquid crystal display device.

The invention discloses an imaging spectrometer optical splitting system based on a single free curved surface. The system is composed of an entrance slit, a free curved surface reflecting mirror, plane blazed grating and an image surface. The system is characterized in that one non-rotational symmetric free curved surface reflecting mirror is used for two times to act as a collimating mirror and an imaging mirror respectively, and plane blazed grating which is high in performance and mature in processing technology is used cooperatively so that the spectrometer optical splitting system which is simple and compact in structure, small in aberration, low in distortion and high in efficiency is realized. According to the embodiment of the imaging spectrometer optical splitting system based on the single free curved surface, great spectral imaging is realized in 400-1000nm visible near-infrared spectrum so that spherical aberration, coma aberration, astigmatism, spectral distortion and spectral line bending are greatly corrected under the premise that the system is ensued to be simple and compact. The imaging spectrometer optical splitting system based on the single free curved surface can be applied to the field of hyper-spectral imaging of spaceflight and aviation.

The invention relates to a micro-optical element for realizing semiconductor laser beam homogenization, which is composed of a plurality of microstructure monomers arranged in a joint sealing mode, wherein each microstructure monomer comprises a front surface and a back surface, the front surface of each microstructure monomer is a spherical surface; an incident surface of the micro-optical element can be formed by the continuous arrangement of the spherical front surfaces of the plurality of microstructure monomers, and an emergent surface of the micro-optical element can be formed by the continuous arrangement of the back surfaces of the plurality of microstructure monomers; the incident surface of the microstructure element can divide the reshaped semiconductor laser beam into multiplesub-beams, and each sub-beam focuses in the microstructure monomer so as to form a series of point light source images; light beams emitted from the point light source images can leave from the back surfaces of the microstructure monomers; and the divergent light emitted from the back surface of each microstructure monomer can be overlaid on the lighting surface. The micro-optical element provided by the invention has the advantages of high light utilization efficiency, good uniformity effect and low cost and can be widely applied to the field of semiconductor laser lighting, so that the laser illuminators can be better used for night monitoring in the occasions, such as public securities, banks, prisons, forests, etc.

The invention provides a device and method for measuring the isolation degree of an optical antenna in a laser communication system in order to solve a problem of measuring the isolation degree of theoptical antenna. The measuring device comprises a light source, a spectroscope, a reflecting mirror I, an optical power meter, a reflecting mirror II and a diaphragm, wherein the diaphragm, the spectroscope and the reflecting mirror I are sequentially arranged along an optical axis of the light source; the reflecting mirror II is arranged on a reflected light path of the spectroscope; a space forsetting a measured optical antenna is reserved between the reflecting mirror II and the spectroscope, or a space for setting the measured optical antenna is reserved between the reflecting mirror I and the spectroscope; the reflecting mirror located at the same light path with the measured optical antenna is used for performing attitude adjustment on the measured optical antenna and does not participate in the measuring process of the isolation degree; and the optical power meter is arranged the side, which does not have an optical element, of the spectroscope. The measuring device can realize fast measurement for the isolation degree of the optical antenna for laser communication and has low requirements for the stability of the laser light source.

The invention provides a backlight module, which comprises a liquid crystal display panel, an optical diaphragm, a back plate and a reflector plate, wherein the liquid crystal display panel, the optical diaphragm, the back plate and the reflector plate are arranged in sequence; the optical diaphragm is fixedly arranged on a lower polarization plane of the liquid crystal display panel; the back plate is used for supporting the liquid crystal display panel and the optical diaphragm; the reflector plate is attached to the inner wall of the back plate; the open end of the back plate is provided with a stepped slot; and the liquid crystal display panel provided with the optical diaphragm is arranged in the stepped slot. The invention also provides a television. The technical scheme provided by the invention is that a diffuser plate in a traditional backlight module is removed, and therefore, the optical energy loss caused by the diffusion of the diffusion plate to a light source is reduced, the number of light-emitting diode (LED) lamps can be reduced, and the energy consumption of the backlight module is reduced. As the diffusion plate is removed from the backlight module, the purchase cost of the diffusion plate is also saved, the assembly process of the backlight module is simplified, the production efficiency is improved, and further, the overall cost of the television is reduced.

The invention relates to a back structure of an electron multiplying charge-coupled device (EMCCD) and a production method of the back structure. The back structure comprises an EMCCD chip, electrode extracting regions, a photosensitive region, a storage grain region, ion implanting regions, an antireflection film and a metal shielding layer, wherein the electrode extracting regions are arranged on two sides of the back side of the EMCCD chip; bonding graphs are arranged on the electrode extracting regions at intervals; the photosensitive region and the storage grain region on the back side of the EMCCD chip are positioned between the electrode extracting regions; the ion implanting regions formed by implanting low-energy ions are separately formed inside the photosensitive region and the storage grain region; by using the antireflection film on the surface of the photosensitive region, a standing wave effect can be reduced, and reflected light rays are reduced; by using the metal shielding layer on the surface of the storage grain region, transmission of incident light on the surface of the storage grain region can be prevented. The back structure disclosed by the invention can be used for improving the photoelectric conversion efficiency of the EMCCD; meanwhile, the manufacturing cost of the device also can be reduced, and the rate of finished products is improved.

The invention discloses an optical fiber gyroscope employing a single-polarized-output polarization-maintaining loop device. Light emitted by a broadband light source enters an end 2-1 of the polarization-maintaining loop device of the light source, a polarized mode is output from an end 2-2 of the polarization-maintaining loop device, the light is split into an upper light beam and a lower light beam through a polarization-maintaining beam splitter of a sensing ring, and the upper light beam clockwise returns to the polarization-maintaining beam splitter through the polarization-maintaining optical fiber sensing ring and a phase modulator; the lower light beam anticlockwise returns to the polarization-maintaining beam splitter through the phase modulator and the polarization-maintaining optical fiber sensing ring; the upper light beam and the lower light beam are synthesized by the polarization-maintaining beam splitter to form interference, the interfered light beam is input through the end 2-2 of the polarization-maintaining loop device and output from an end 2-3 of the polarization-maintaining loop device, a photoelectric detector converts a light signal into an electric signal by and input the electric signal into a signal processing unit, and the signal processing unit generates a signal added to the phase modulator and simultaneously outputs a rotary signal of the gyroscope relative to an inertial reference system. The optical fiber gyroscope can reduce light energy loss caused by the polarization-maintaining loop device of the light source and the use of elements.

The invention discloses a short-focus projection lens structure with transmittance of 0.52. The short-focus projection lens structure is characterized by comprising twelve lenses which are sequentially arranged, namely, a front-group first piece is negative meniscus aspherical lens, a front-group second piece is negative meniscus aspherical lens, a front-group third piece is biconcave spherical lens, a front-group fourth piece is single-convex spherical lens, a rear-group first piece is negative meniscus spherical lens, a rear-group second piece is biconvex lens, a rear-group third piece is balsaming lens of a biconcave lens and a biconvex, a rear-group fourth piece is balsaming lens of a biconvex lens and a biconcave lens, a rear-group fifth piece is biconvex lens and a rear-group sixth piece is biconvex lens. The short-focus projection lens structure is ultra-short in distance and low in brightness loss, can be matched with multiple rear projection machines to manufacture an ultra-thin large-screen rear projector and can be matched with various digital projectors, and is suitable for various occasions required to project large pictures in an ultra-short distance.

The invention discloses a smectic state liquid crystal dyeing color display device which comprises a first substrate layer and a second substrate layer, wherein a mixing layer is arranged between the first substrate layer and the second substrate layer; the mixing layer is formed by mixing smectic state liquid crystal, additive and dichroic dye; a first conductive electrode layer is arranged at one side of the first substrate layer towards the mixing layer; a second conductive electrode layer is arranged at one side of the second substrate layer towards the mixing layer; a color film layer is arranged at one side of the first conductive electrode layer or one side of the second conductive electrode layer; the dichroic dye is black; and a backlight source is arranged at one side of the second substrate layer towards outside. The smectic state liquid crystal dyeing color display device adopts the image-forming principles of ways of scattering and transmission so as to realize the effect of all-color image display.