16results about How to "Reduce stray light" patented technology

The present disclosure relates to an optical system of a fundus camera with a light barrier, which comprises an illumination device, a first optical assembly, a second optical assembly, an imaging device and a positioning device; the illumination device comprises an illumination light source; the first optical assembly comprises a first half-transmission half-reflection mirror, a first polarizer, a second half-transmission half-reflection mirror and a retinal objective lens, the first optical assembly directs the light beam from the illumination light source to the fundus of the eye to be examined, and guides the reflected light of the fundus to the second optical assembly; the second optical assembly comprises a second polarizer and a focusing module, the focusing module guides the reflected light to the imaging device; the imaging device receives the light from the second optical assembly to form the fundus image; the positioning device comprises a guiding light source and a light barrier, the light beam of the guiding light source has a preset shape after passing through the light barrier, the imaging device acquires the fundus images of different regions of the eye to be examined based on the guiding light source, and the first optical assembly directs the light beam of the guiding light source to the fundus of the eye to be examined for imaging.

This utility model discloses a reflector cup, including a body with a light outlet at the top and a light inlet at the bottom. Along the direction from the light inlet to the light outlet, a line connecting the two endpoints of the reflective surface curve intersects the curve of the body. The optical structure between the light inlet and the intersection point is a first reflective surface, and the optical structure between the intersection point and the light outlet is a second reflective surface. The first reflective surface at least has the function of adjusting the light emission angle, and the second reflective surface at least has the function of uniformizing the light. This application's design, where the straight line connecting the endpoints of the reflective surface curve intersects the curve of the reflector cup, improves the uniformity and efficiency of the light spot, and alleviates glare. Even when used with lenses, the surface of the lenses can maintain uniform brightness without causing glare, and it also reduces stray light caused by Fresnel reflection from the lenses.

The invention provides vehicle glass, a vehicle glass assembly and a vehicle, the vehicle glass comprises laminated glass, a first bonding layer and a first glass plate, the first glass plate is connected with the laminated glass through the first bonding layer or arranged in the laminated glass through the first bonding layer, and the first bonding layer is arranged between the first glass plate and the laminated glass. The first glass plate comprises a first signal transmission area and a first shielding area, and the first shielding area is arranged around the first signal transmission area. Therefore, the problems of local optical deformation and distortion of the glass are reduced, and the diopter performance of the vehicle glass in a sensor area is remarkably improved.

The invention relates to a convex high-reflection concave low-reflection color blindness correction lens and a preparation method thereof. It solves the problems of limited design freedom, excessive number of film layers and stress in the prior art. It comprises a transparent lens substrate, a high-reflection film layer formed on the convex surface and a high-transmission film layer formed on the concave surface. The convex high-reflection film layer adopts a multilayer composite structure of silver and silicon dioxide, and through accurate control of the thickness of the silver layer and the matching of the dielectric layer, selective reflection and attenuation of specific color light are realized; the concave high-transmission film layer adopts a multilayer dielectric interference film system design of titanium dioxide and silicon dioxide, realizing accurate transmission and spectral shaping of each waveband. The advantages of the invention are: breaking through the design limitations of traditional single-sided coating, adopting a double-sided asymmetric film system synergistic control strategy, realizing higher spectral selectivity, lower stray light, more natural lens appearance and standardized production of eight types of clinical prescriptions.

This invention provides a split-type cold screen for an infrared detector and its assembly method. The split-type cold screen for the infrared detector includes a cold screen body and matte fins. The assembly method includes: applying a black coating to both the cold screen body and the matte fins, pre-baking them, then initially assembling the pre-baked cold screen body and the matte fins, and finally baking the pre-assembled cold screen to complete the assembly. This invention places the cold screen assembly step after pre-baking and before baking, using the bonding force of the black coating to connect the cold screen body and the matte fins. This eliminates the adhesive bonding step in the split-type cold screen assembly process, solving the problem of using adhesives to bond the cold screen body and matte fins in the split-type cold screen assembly process. This ensures good mechanical reliability of the cold screen assembly in low-temperature vibration environments and also improves the performance of the detector components and the efficiency of the cold screen assembly process.

The utility model relates to the technical field of lighting lamps, and particularly discloses a dual anti-dazzle down lamp which comprises a down lamp body, an outer cover is sleeved on the outer side of the down lamp body, an LED light source and a reflection cup are sequentially arranged on the inner side of the outer cover from inside to outside, a light-emitting opening is formed in the front end of the reflection cup, and the light-emitting opening is communicated with the outer cover. An LED light source is arranged in the reflecting cup, a light-emitting opening is formed in the reflecting cup, an acrylic mask is arranged on the inner side of the reflecting cup, light emitted by the LED light source irradiates towards the acrylic mask, a frosted face is arranged on the acrylic mask, and the distance between the acrylic mask and the light-emitting opening ranges from 15 mm to 25 mm. The frosted face is arranged on the acrylic mask, so that light is fuller and more uniform, light is soft, dazzling is prevented, the shading angle is enlarged by increasing the distance between the light source and the light-emitting opening, stray light is reduced, dazzling prevention and visual fatigue prevention are further achieved, the overall structure is simple, production cost is low, and the application range is wide.

The invention provides a test fixture for testing an image sensor chip, and aims to solve the problems of poor imaging consistency, limited site layout and the like caused by stray light generated by reflection and refraction of light on the surface of a structural member in an existing structure. The through straight hole is formed in the structure between the light source and the lens, and the transparent light guide piece is embedded in the straight hole, so that illumination light is transmitted in a unique and stable path. The material and the shape of the light guide piece can be freely selected according to requirements so as to adapt to different spectral characteristics and light source positions. The light enters the dodging part and the lens system after being directionally transmitted by the light guide part, and the middle does not contact the surface of a surrounding structure, so that stray light is effectively prevented from being generated, and the illumination uniformity and imaging consistency of each test position are remarkably improved. Due to the fact that the light path is strictly limited, the scheme is not limited by the field angle of the lens any more, the site distance can be reduced, a plurality of test positions can be flexibly arranged, the number of testable points in unit area is increased, and therefore the test efficiency and the throughput capacity of a production line are improved. The probe card is simple in structure, convenient to process and high in adaptability, can be directly applied to an existing probe card system, and has good popularization value.

The application relates to the technical field of laser ranging, in particular to a laser range finder, which comprises a laser emitter, a collimating lens, a receiver, a receiving lens, a collimating lens barrel, a receiving lens barrel and light-shielding cleaning glue; the collimating lens barrel is provided with a first accommodating groove, a first opening of the first accommodating groove corresponds to and covers a side wall of the collimating lens, and extends to a side wall of the collimating lens close to a light-out surface and beyond the side wall, the light-shielding cleaning glue comprises first light-shielding cleaning glue, in a first state, the first light-shielding cleaning glue is filled in the first accommodating groove and covers the side wall of the collimating lens, in a second state, part of the first cleaning glue spreads out from the first opening beyond the side wall and covers the light-out surface of the collimating lens; and / or the receiving lens barrel is provided with a second accommodating groove, a second opening of the second accommodating groove corresponds to and covers a side wall of the receiving lens, and extends to a side wall of the receiving lens close to a light-in surface and beyond the side wall, the light-shielding cleaning glue comprises second light-shielding cleaning glue filled in the second accommodating groove.

This invention discloses a VR optical structure, which, from the object side to the image side, sequentially includes: a first lens, a second lens, an anti-reflection component, and a display panel. The display panel is provided with a first quarter-wave plate. The anti-reflection component, from the object side to the image side, sequentially includes a first anti-reflection film, a second quarter-wave plate, a first linear polarizing film, and a third quarter-wave plate. The rotation angles of the first and second quarter-wave plates are the same, and the difference between the rotation angles of the first and third quarter-wave plates is 90°. This VR optical structure eliminates the need for a film on the display panel, effectively reducing stray light generated by reflection and improving image quality. This invention also discloses an electronic device, including a device body and the aforementioned VR optical structure, wherein the VR optical structure is disposed on the device body.

This utility model relates to a dust sensor that reduces stray light. The dust sensor includes a housing, a light-emitting element, a light-receiving element, and a circuit board. The housing has a partition wall dividing it into a circuit board area and a detection area. A dust passage is located within the detection area. The circuit board is mounted in the circuit board area. The partition wall has light-emitting holes and light-receiving holes corresponding to the light-emitting element and the light-receiving element, respectively. A gap is maintained between the light-emitting element and the light-emitting hole. The circuit board area also has a light-shielding plate extending vertically downward from the housing, corresponding to the light-emitting element. The light-receiving element is embedded in the light-receiving hole. Within the detection area, vertically penetrating light-shielding walls are provided on both sides of the light-receiving element, connecting to the partition wall. The ends of the light-shielding walls extend towards the dust passage. The gap prevents stray light inclined to the optical axis of the light-emitting element from entering the detection area. The light-shielding walls also protect the light-receiving element. This utility model can reduce stray light without the need for a lens, thus reducing assembly costs and difficulty, and improving assembly efficiency.

The present application provides a metal light collecting component and an optical imaging lens module comprising the same. The metal light collecting component comprises a metal sheet and a light shielding sheet with an opening. The light shielding sheet is arranged on a surface of the metal sheet. The gap between the metal sheet and the light shielding sheet near the opening of the light shielding sheet is defined as a light collecting space. The light collecting space can attenuate the stray light entering the light collecting space through the opening.

The present disclosure relates to an optical system for guiding the line of sight of an eye of a subject to the fundus of the eye, comprising an illumination device, a first optical assembly, a second optical assembly, an imaging device and a positioning device; the illumination device comprises an illumination light source; the first optical assembly comprises a first semi-transparent half mirror, a first polarizer, a second semi-transparent half mirror and a retinal objective, the first optical assembly directs the light beam from the illumination light source to the fundus of the eye of the subject and guides the reflected light from the fundus to the second optical assembly; the second optical assembly guides the light from the first optical assembly to the imaging device; the imaging device receives the light from the second optical assembly to form the fundus image; the positioning device comprises a directing light source, an aperture and a lens, the light beam emitted through the positioning device has a preset shape, the imaging device captures the fundus image of different areas of the fundus based on the directing light source, and the first optical assembly directs the light beam of the directing light source to the fundus of the eye of the subject through the first semi-transparent half mirror for imaging.

The application relates to the technical field of optical fiber communication, in particular to a low-crosstalk high-adaptability optical fiber array and a preparation method thereof, which comprises an integrated composite substrate. The integrated composite substrate is a layered composite structure comprising a base layer, an optical absorption intermediate layer and a surface strengthening layer, N groups of parallel distributed straight V grooves are arranged on the upper surface and the lower surface of the substrate, the straight V grooves on the upper surface and the straight V grooves on the lower surface are arranged in the same direction and the projection areas are completely dislocated and do not overlap. A low-crosstalk high-adaptability optical fiber array preparation method comprises substrate preparation, optical fiber assembly preparation, encapsulation and curing, end face processing, antireflection film deposition and assembly installation. The application can realize the core advantages of high coupling efficiency, low crosstalk, wide temperature stability and multi-scene adaptation through the dislocated straight V grooves of the integrated composite substrate, the multi-dimensional crosstalk suppression structure, the precise temperature compensation and the flexible parameter design, and can meet the high-end application requirements of high-speed optical communication and large-scale sensing.

The present application relates to the technical field of semiconductor manufacturing, in particular to a nanometer high-precision bonding mark measurement system, which mainly solves the technical problems of interference ghost interference, high system complexity and sensitivity to object table parameters in the existing nanometer high-precision bonding mark measurement system. The system comprises a transparent object table, a collimating light source, an imaging module and a processing module; the upper and lower surfaces of the optical window of the transparent object table are provided with an antireflection film; the collimating light source is arranged below the transparent object table to provide collimated light penetrating the optical window and the wafer pair; the imaging module collects the superimposed image of the alignment marks of the upper and lower wafers; and the processing module is used for determining the center positions of the upper and lower wafer marks and calculating the alignment deviation. The system suppresses the interference ghost caused by the multiple reflections of the transparent object table through the collimating light source, and the antireflection film suppresses the reflection loss, thereby improving the image contrast and positioning accuracy; at the same time, the optical path structure is simplified, and the system is not sensitive to the thickness of the transparent object table, thereby improving the system stability and production efficiency.

The present application relates to an optical system, comprising a lens barrel, and an imaging lens group and a plurality of spacer elements arranged in the lens barrel, the optical system satisfies: 1.06<|EP45 / SAG52|≤1.34; 2.61<R11 / (D5m-d5m)≤7.27; 2.89≤(CT5+CT6) / CP5<3.99; wherein, R11 is the curvature radius of the object side surface of the sixth lens, D5m is the outer diameter of the image side surface of the fifth spacer element, d5m is the inner diameter of the image side surface of the fifth spacer element, EP45 is the interval distance of the fourth spacer element and the fifth spacer element along the optical axis direction, SAG52 is the axial displacement from the intersection of the image side surface of the fifth lens and the optical axis to the optical area effective radius vertex of the image side surface of the fifth lens, CP5 is the maximum thickness of the fifth spacer element, CT5 is the central thickness of the fifth lens on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis. The optical system of the present application effectively reduces the risk of stray light and improves the imaging quality by constraining the inner and outer diameters and the curvature radius of the lens and the spacer element.

The utility model discloses an optical reflector and a lamp. The optical reflector comprises a wedge-shaped body defined by a first reflecting surface, a third reflecting surface and two second reflecting surfaces, the first reflecting surface and the third reflecting surface are oppositely arranged, and the two second reflecting surfaces are adjacent to the first reflecting surface and the third reflecting surface respectively and are oppositely arranged; the upper bottom surface of the wedge-shaped body is a light source incident port, and the lower bottom surface of the wedge-shaped body is a light outlet; the area of the light outlet is larger than that of the light source incident port; the first reflecting surface, the third reflecting surface and the two second reflecting surfaces are all planes or curved surfaces. According to the technical scheme, the curved surface curvature is high in accuracy, economical efficiency is achieved, and mass production and manufacturing can be achieved; meanwhile, structural assembly is simple, the optical requirement is directly met through a single element, a product and a lamp light-emitting assembly can be directly assembled together, an additional assembling structure is not needed, and cost is greatly saved.