6results about How to "Eliminate stray light" patented technology

The invention discloses a wide-temperature long-wave infrared coaxial four-mirror optical lens for space tiny dark and weak target detection, and solves the problems that an existing optical lens for space tiny dark and weak targets is large in size, high in weight and poor in temperature adaptability. The first reflecting mirror, the second reflecting mirror, the third reflecting mirror and the fourth reflecting mirror are sequentially and coaxially arranged from a light incident end to a light emergent end; the reflecting surfaces of the first reflecting mirror and the second reflecting mirror are oppositely arranged, and the reflecting surfaces of the third reflecting mirror and the fourth reflecting mirror are oppositely arranged; light through holes are formed in the centers of the second reflector, the third reflector and the fourth reflector; the second reflector is used for receiving incident light and reflecting the incident light to the first reflector, and light beams reflected by the first reflector enter the fourth reflector through light through holes in the centers of the second reflector and the third reflector and are reflected to the third reflector for reflection. And the light beams reflected by the third reflector pass through a light through hole in the center of the fourth reflector and then are converged to a photosensitive receiving surface of an external detector.

The utility model discloses an anti-crosstalk multimode interference coupler for an MZI (Mach Zehnder Interference) structure. The coupler specifically comprises a single-mode input waveguide, a multimode interference area waveguide, two single-mode output waveguides, two stray light output waveguides, two stray light interference area waveguides and two metal absorption areas, the metal absorption region, the stray light interference region, the stray light output waveguide, the multi-mode interference region waveguide and the single-mode output waveguide are connected in sequence, and the coupler is symmetric about the single-mode input waveguide.

This invention relates to the field of portable lighting fixtures, and more particularly to a portable LED lighting fixture, comprising a base. A rotating ring assembly, composed of multiple concentric rings, is installed in the center of the base. These concentric rings are rotatably connected by rotating rods. The rotating rods on the inner and outer sides of the concentric rings are vertically distributed. A base column is rotatably connected to the center of the innermost concentric ring via a rotating rod. A counterweight is fixedly connected to the bottom of the base column, and the counterweight is located in the lower part of the base. An electric push rod is installed in the upper part of the base column, and a fixing frame is fixedly connected to the top of the electric push rod. A fixing seat is fixedly connected to the bottom of the fixing frame, and a guide strip is fixedly connected to the center of the bottom end of the fixing seat. This invention allows for free control of the number of illuminated light panels and the actual luminous area according to ambient brightness and lighting requirements. It can achieve both concentrated high-brightness lighting in a small area and full-area illumination by activating all light panels, distributing light power as needed.

This utility model relates to an ultraviolet detector that accommodates different sensitivities. It solves the technical problem of poor detection performance of existing detectors for components of different concentrations. It includes a detector housing, with a light source mechanism at one end of the housing. The light source mechanism is connected to a grating body disposed within the detector housing via a light source channel. A beam-splitting housing is installed at the end of the detector housing away from the light source mechanism. The beam-splitting housing has a first optical path and a second optical path arranged perpendicularly to each other. A photosensitive detection component connected to the first and second optical paths is mounted on the beam-splitting housing. The beam-splitting mechanism is located inside the detector housing and is connected to a polarization mechanism, which is connected to the first and second optical paths respectively via mirrors. The advantages are: the first and second optical paths with different optical path lengths can meet the detection requirements for components of different concentrations; and the polarization mechanism can eliminate stray light from monochromatic light, improving the detection effect.

The utility model discloses a kind of curtain wall decorative lamps, including lamp shell, light source board, lampshade and adjusting mounting seat, light source cavity inside lamp shell is equipped with asymmetric light-reflecting inclined plane A and light-reflecting inclined plane B, cooperate with the light mixing inclined plane in lampshade, light efficient mixing and uniform light emission are realized jointly, effectively eliminate glare and mottle, light source board adopts double-row lamp pearl of staggered arrangement, each lamp pearl is equipped with flexible convex cover, further eliminate stray light, lamp body bottom connects multiple groups of anti-falling rope, guarantee high-altitude safety, its core is adjusting mounting seat adopts worm gear drive mechanism, by rotating knob, stepless fine adjustment of the pitch angle of lamp body can be realized, and using its inherent self-locking characteristic, ensure that angle adjustment is long-term stable after, windproof and anti-vibration, solve the difficult problem that traditional curtain wall lamp adjustment is complicated, easy to deviate.

The application provides an LED epitaxial structure and a preparation method thereof. The LED epitaxial structure comprises, from bottom to top, a bottom buffer layer on a substrate, an etching stop layer, a first-type semiconductor layer, an active layer and a second-type semiconductor layer. The second-type semiconductor layer comprises, from bottom to top, an electron blocking layer, a second waveguide layer, a second-type confinement layer, a transition layer, a second-type window layer and a second-type ohmic contact layer. The electron blocking layer is a periodic structure formed by alternately growing a first blocking layer and a second blocking layer. The Al component of the first blocking layer in each period is higher than that of the first blocking layer in the previous period, and the Al component of the second blocking layer in each period is lower than that of the second blocking layer in the previous period. The electron blocking layer designed in the application is in a ladder type, which is beneficial to electron confinement and hole injection, thereby increasing the radiation recombination rate in the active layer and improving the light-emitting efficiency and brightness of the LED.