384 results about "Light reflectance" patented technology

The invention relates to a back contact photovoltaic cell piece, a back contact photovoltaic cell assembly and a preparation method, and relates to the technical field of photovoltaic cell pieces. According to the preparation method, at least part of the structure of the surface of the silicon substrate is subjected to at least two times of texturing treatment to form a textured surface, in the two adjacent times of texturing treatment, the concentration of a texturing solution used in the later texturing treatment is smaller than that of a texturing solution used in the previous texturing treatment, the substrate is dried by ozone, and the textured surface is formed. And at least forming a silicon oxide passivation layer on the textured surface. Through at least two times of texturing treatment, the average size of the pyramid structure of the formed textured surface is relatively small, the density of the pyramid structure of the textured surface is relatively large, and the distribution uniformity degree of the pyramid structure of the textured surface is relatively large. The back contact photovoltaic cell prepared according to the preparation method has the advantages of relatively low light reflectivity and relatively low recombination rate, so that the prepared back contact photovoltaic cell can have relatively high photoelectric conversion efficiency.

The embodiment of the invention relates to the field of photovoltaic technology, and provides a solar cell and a preparation method thereof, the solar cell comprises a substrate, the substrate is provided with a first surface and a second surface which are opposite, at least one of the first surface and the second surface is provided with a suede, the suede is composed of a plurality of pyramid structures, and the side wall of at least part of the pyramid structures is provided with a wrinkle part; the wrinkle part is composed of a plurality of scaly protrusions, in the direction from the top of the pyramid structure to the bottom of the pyramid structure, the length of the wrinkle part is a first length, the length of the side wall of the pyramid structure is a second length, and the ratio of the first length to the second length is larger than or equal to 0.5. According to the solar cell and the preparation method thereof provided by the embodiment of the invention, the light reflectivity of the solar cell is at least reduced, so that the light conversion efficiency of the solar cell is improved.

A highly reliable display device is provided. The display device includes a first conductive layer, a second conductive layer, a third conductive layer, a fourth conductive layer, an insulating layer, a functional layer, and a light-emitting layer. The second conductive layer is provided over the first conductive layer and the third conductive layer is provided over the second conductive layer. A side surface of the second conductive layer is positioned on the inner side of side surfaces of the first and third conductive layers in a cross-sectional view. The insulating layer is provided to cover at least part of the side surface of the second conductive layer. The fourth conductive layer is provided to cover the first to third conductive layers and the insulating layer and to be electrically connected to the first to third conductive layers. The functional layer is provided to include a region in contact with the fourth conductive layer and the light-emitting layer is provided over the functional layer. The visible light reflectance of at least one of the first to third conductive layers is higher than the visible light reflectance of the fourth conductive layer.

The utility model is suitable for the technical field of solar cells, and provides a back contact solar cell, a photovoltaic assembly and a photovoltaic system, the back contact solar cell comprises a silicon substrate, the back surface of the silicon substrate is provided with a plurality of first doped regions and a plurality of second doped regions which are sequentially and alternately arranged along a first direction, the polarities of the first doped region and the second doped region are opposite, the adjacent first doped region and second doped region are electrically isolated through a groove, the groove comprises a side wall and a bottom surface, the side wall is provided with a plurality of first miniature pyramid structures, the bottom surface is provided with a plurality of second miniature pyramid structures, the first miniature pyramid structures correspond to a second direction, and the second direction corresponds to a third direction. The second micro pyramid structure corresponds to a third direction, and the third direction is perpendicular to the bottom face and intersects with the second direction. Through the arrangement, the light trapping effect between the first micro pyramid structure and the second micro pyramid structure is good, and the light reflectivity is reduced, so that the photoelectric conversion efficiency of the back contact solar cell is improved.

The invention provides a coated substrate, laminated glass and a vehicle. The film-coated substrate comprises a substrate body and a film-coated element arranged on at least one side of the substrate body, the film-coated element comprises at least two light absorption layers and a high-refractive-index layer arranged between the two light absorption layers, the light absorption layers are made of at least one material selected from W, Ni, Cr, Ti, Nb, Mo, Si and Zr, and the refractive index of the high-refractive-index layer is larger than or equal to 1.8 at the position of light with the wavelength of 550 nm. By adopting the film-coated element composed of the light absorption layer and the high-refractive-index layer, the film-coated substrate has lower visible light transmittance TL1 and lower light reflectivity RL, and the shielding function of an ink area in related technologies is met. Moreover, the coating element is arranged on the substrate in a coating high-temperature sintering manner, so that the damage to the substrate due to the arrangement of a printing ink area in the related technology can be reduced, the impact resistance of the edge part of the substrate is improved, the probability of fracture of the substrate is reduced, and the structural strength of the coating substrate is improved.

The utility model provides a lamp tube and a heating system, the lamp tube comprises a shell and a lamp filament, the shell is divided into a first part and a second part along a separation line in the horizontal direction, the outer surface of the first part is provided with at least one layer of reflecting film, and the infrared light reflectivity of the reflecting film is not lower than 95%. The heating system uses a lamp tube group formed by the lamp tubes and is used for heating wafers. According to the lamp tube, the heating energy efficiency can be improved, the temperature rising speed of a heating system is high, temperature control is uniform, the RTP annealing efficiency can be improved, and cost is reduced.

The utility model provides an LED chip and lighting equipment, and relates to the technical field of semiconductors. Each of the electrode pads and the electrode fingers is composed of a reflective electrode layer and an electrode layer, the first reflective electrode layer can improve the light reflectivity of the electrode fingers, and the second reflective electrode layer can improve the light reflectivity of the electrode pads, so that the purpose of improving the luminous efficiency of the LED chip is achieved. The first electrode layer and the second electrode layer can be understood as electrode layers of a conventional LED chip, the first electrode layer covers the first reflection electrode layer, and the second electrode layer covers the second reflection electrode layer, so that the reflection electrode layers and the epitaxial layer can be prevented from peeling off; and the second electrode layer is also in contact with the bump structure of the epitaxial layer, and the contact stability of the part is relatively higher than the contact stability of the second electrode layer and the second reflection electrode layer, so that peeling between the second electrode layer and the second reflection electrode layer can be avoided, and the stability of the electrode structure is comprehensively improved.

The present disclosure provides a method and system for generating and inferring a high-resolution true-color visible light model. This approach leverages historical infrared brightness temperature data at the original resolution to generate a standard distribution model of historical infrared brightness temperatures. A full-disk two-dimensional brightness temperature model is constructed using historical multi-channel brightness temperature data. This model is then compared with the standard infrared brightness temperature distribution model at the original resolution to assess similarity, allowing for the identification of clear-sky areas and the formation of a corresponding clear-sky mask. The clear-sky signal is subsequently removed to produce a historical multi-channel cloud satellite dataset. To further refine the dataset, the historical multi-channel cloud satellite dataset is regionally segmented, extracting valid data from each region to form a local time-span dataset, ensuring more precise and reliable modeling of true-color visible light reflectance.

The invention relates to a bionic mist catching net material and a construction method and application thereof, and belongs to the field of air water collecting materials. The bionic mist catching net is a thermoplastic polymer fiber net, and radiation refrigeration particles are blended in fibers of the fiber net; and the part coated with the hydrophobic micro-nano coating and the part not coated with the hydrophobic micro-nano coating on the surface of the fiber net are alternately distributed. The radiation refrigeration particles are introduced into the bionic mist catching net material, and the hydrophobic coating is distributed on the surface of the bionic mist catching net material, so that the light reflectivity and the intermediate infrared emissivity are improved, and the radiation refrigeration efficiency is improved. Besides, the surface hydrophobic coating part forms a super-hydrophobic area, fog drops are promoted to be quickly coalesced into beads after collision, energy dissipation caused by spreading of a liquid film is reduced, the fiber substrate without the coating is kept hydrophilic, a heterogeneous wetting surface is formed, Laplace pressure difference is generated by surface energy difference at a hydrophilic-super-hydrophobic interface, and the super-hydrophobic surface is formed. The spontaneous migration of liquid drops from a super-hydrophobic region to a hydrophilic region is accelerated, and the water collection efficiency is remarkably improved.

The invention relates to a regulation and control method based on an automatic measuring and monitoring system of a UV lamp set and a monitoring and measuring system of the regulation and control method, and belongs to the technical field of UV curing processes. Comprising the following steps: S1, periodically detecting the light reflectivity within the radius range of 15-20 cm at the periphery through a UV energy detection sensor; s2, according to the light reflectivity obtained in the step S1, calculating to obtain the light variation within the radius range of 15-20 cm on the periphery; s3, presetting an abrupt change threshold value M, comparing the abrupt change threshold value M with the light variation in the detection period calculated in the step S2, when the abrupt change threshold value M is greater than the light variation, considering that the reflectivity abrupt change occurs in the sampling period, and calculating the reflectivity abrupt change rate; s4, according to the reflectivity abrupt change rate obtained in the step S3, the UV energy distribution abnormal level is judged; s5, positioning the coordinates of the abnormal region after the abnormal level is obtained in the step S4; and corresponding adjustment measures are taken according to different abnormal levels.

Belonging to the technical field of lamp shell materials, the invention discloses an anti-aging lamp shell composite material, which comprises the following components by mass: 80-110 parts of modified PC master batch; 20 to 30 parts of modified ABS master batch; 2-7 parts of titanium silicon powder; 8-16 parts of hollow glass beads; 2 parts of a toughening agent; 0.1 to 0.3 part of a lubricant; the titanium-silicon powder effectively increases the white brightness of the lamp body shell, and when the titanium-silicon powder is used in cooperation with the hollow glass beads, the lamp shell can have higher light reflectivity, the lamp shell reflects most light to the diffusion plate and then emits the light, the overall luminous flux of the lamp is increased, meanwhile, the light absorption amount of the lamp shell is reduced, and the aging speed can be effectively slowed down. Wherein the modified PC master batch is prepared by mixing PC resin, 2, 6-di-tert-butyl-4-methylphenol and thiodipropionic acid diester; wherein the modified ABS master batch is prepared by mixing ABS resin and a composite ultraviolet absorbent. The PC master batch and the ABS master batch are both modified, so that the oxidation resistance is higher after the lamp shell is formed.

The invention relates to the field of energy-saving and environment-friendly new materials, in particular to a passive cooling radiation refrigeration light-transmitting film and a preparation method thereof. Comprising a first release protective film layer, a back adhesive layer, a first base material film layer, a second base material film layer, an IR reflecting layer, an IR selective emitting layer, a third base material film layer, a self-cleaning and self-repairing functional coating and a second release protective film layer which are sequentially stacked. The passive cooling radiation refrigeration light-transmitting film provided by the invention is moderate in thickness, strong in flexibility and large in stretchability, and can be tightly attached to any surface part. Under the condition that the appearance color is not influenced, the visible light wave band transmittance is greater than 70%, the infrared light reflectivity is greater than 68%, the 8-13 [mu] m atmosphere window emissivity is greater than 97%, the radiation refrigeration power is greater than 140 W / m < 2 >, and the heat insulation performance is good; as the used base material is TPU or PET, the tensile property is large, the flexibility is strong, and the product has good flexibility and contractibility, and is not easy to wrinkle and blister during film pasting construction.

An optical sensor device configured for use in combination with a fluid flowing through a tubing, the optical sensor device includes a light source configured to emit a light, with at least a portion of the light being exposed to a fluid in the tubing and reflected, an optical sensor configured to receive at least a portion of the reflected light and analyze at least a portion of the received reflected light to determine a reflectance measurement, and a controller configured to correlate the reflectance measurement to an input particulate level and generate an output indicative of the fluid flow rate corresponding to the reflectance measurement. Also disclosed is a method of optically measuring fluid flow rate in a fluid processing system including optically monitoring fluid flow through a transparent portion of a tubing by measuring light reflectance of particles in the fluid.

A vehicular driving assist system includes an interior rearview mirror assembly having a mirror head adjustable about a mounting base. The mirror head accommodates an electrochromic mirror reflective element. An electrically dimmable window is disposed at the vehicle and is electrically operable to adjust visible light transmissivity of the electrically dimmable window. The vehicular driving assist system, based at least on processing sensor data captured by a light sensor, determines ambient light at the vehicle. The vehicular driving assist system, based at least on the determined ambient light, (i) adjusts light reflectivity of the electrochromic mirror reflective element and (ii) adjusts visible light transmissivity of the electrically dimmable window.

The invention discloses a high-stability light-absorption low-reflection film which comprises a substrate layer, an Al2O3 layer, Ti layers, SiO2 layers and a hydrophobic layer, wherein the Ti layers and the SiO2 layers are alternated with each other; wherein the sum of the total optical thicknesses of the Ti layers and the SiO2 layers which are alternated with each other is greater than 4.4726; the invention further discloses a preparation method of the high-stability light-absorption low-reflection film. According to the invention, the Ti layer with a higher refractive index is creatively selected to replace a traditional black film made of a high-refractive-index material, and the high-refractive-index material and the low-refractive-index material are mutually alternated, so that the effective refractive index of the film layer is close to the refractive index of the substrate layer; the problem that the spectral reflectivity is unstable due to the fact that a thin layer is too sensitive in the plating process of a traditional light-absorbing low-reflection film is solved, and the stability, compactness and other performance of the film layer are effectively improved.

The invention provides a method for optimizing the luminous reflectance of a graphene nano coating of a photovoltaic panel, which belongs to the technical field of photovoltaic panels and comprises the following steps: firstly, acquiring optical characteristic parameters of the surface of the photovoltaic panel by using various instruments such as a laser reflectometer and a scanning electron microscope; performing multivariate decomposition on the reflectivity data by adopting a Fourier transform method, and constructing an optical characteristic matrix by applying a least square method; 100 groups of coating structure parameters are generated through a K-means clustering algorithm and are subjected to clustering analysis, and 10 clustering centers are selected; a sample is prepared by adopting a chemical vapor deposition method, and experimental verification is carried out under the illumination intensity of 1000 watts per square meter. And finally, through 50-generation iterative optimization of a genetic algorithm, obtaining optimal structural parameters of the graphene nano-coating, and preparing the optimized photovoltaic panel surface coating by using a plasma enhanced chemical vapor deposition technology, so that the technical problem that the optical characteristics of the graphene nano-coating are difficult to accurately regulate and control to achieve a better reflection inhibition effect is solved.

The present application provides a kind of vehicle laminated glass and its application, which includes outer sheet glass, inner sheet glass and intermediate film, the outer sheet glass has the first surface towards outside and the second surface towards inside, the inner sheet glass has the third surface towards outside and the fourth surface towards inside, the intermediate film is bonded with the second surface and the third surface, infrared reflection film is provided between the outer sheet glass and the inner sheet glass, and low-emissivity film is provided on the fourth surface;The mirror factor α of the vehicle laminated glass is less than or equal to 15, and the mirror factor α is according to the formula α=RL / TL 2 RL is the visible light reflectance of the vehicle laminated glass measured from the inside, and TL is the visible light transmittance of the vehicle laminated glass. When the vehicle laminated glass is used as the sunroof glass of the vehicle roof, the use of sunshade curtain can be cancelled, the mirror reflection effect of the inside can be effectively improved, and the user experience and passenger privacy can be protected.

The utility model provides a glass assembly, a window assembly and a vehicle. The glass assembly includes: a glass body; the first functional layer is suitable for adjusting the visible light reflectivity and is arranged on one side of the glass body; and the second functional layer is suitable for adjusting haze and is arranged on one side of the first functional layer. According to the glass assembly, the first functional layer with the visible light reflectivity adjusting function and the second functional layer with the haze adjusting function are integrated, and the visible light reflectivity and / or the haze can be adjusted according to different application occasions and user requirements, so that the glass assembly has multiple functions, the user experience is improved, and the cost benefit requirement is met.

To provide a power generation module and a window in which a lead wire is inconspicuous when viewed from the indoor side.SOLUTION: A power generation module according to the present disclosure includes a first substrate having translucency, a transparent second substrate facing the first substrate, a first electrode layer provided on the first substrate, a semiconductor layer stacked on the first electrode layer, a second electrode layer stacked on the semiconductor layer, a lead wire provided on the first electrode layer, and a reflection suppression layer located between the lead wire and the second substrate so as to cover the lead wire in plan view. The optical reflectance of the reflection suppressing layer is lower than the optical reflectance of the lead wire. A window according to the present disclosure includes the power generation module and a fixture for fixing the power generation module to an installation object.SELECTED DRAWING: Figure 2

To provide a light-emitting device capable of reducing nonuniformity of current density distribution.SOLUTION: A light-emitting device comprises: a semiconductor structure; a translucent conductive film which is disposed on a second semiconductor layer; a translucent insulation film which is disposed on the translucent conductive film and includes a plurality of first openings; and a light reflectance conductive film which is disposed on the translucent insulation film and in contact with the translucent conductive film in the first openings. In a planar view, each of a plurality of extending parts of a first semiconductor layer includes an end which is positioned closest to a second outer peripheral part. In the planar view, the translucent conductive film includes a plurality of outer edges opposed to the ends of the plurality of extending parts in a second direction. In the planar view, the plurality of first openings pass an outer edge closest to the second outer peripheral part in the plurality of outer edges of the translucent conductive film, is not positioned between a first straight line extending in a first direction and a first outer peripheral part and is positioned between the first straight line and the second outer peripheral part.SELECTED DRAWING: Figure 1

The invention discloses a Mo / Si reflector reflectivity measurement system and method based on an acousto-optic monochromator, the system comprises an EUV light source, an EUV energy meter, a monochromator and an EUV reflectivity meter, the EUV light source is used as a detection light source, the EUV energy meter is used for monitoring the fluctuation condition of the EUV light source and providing a light source fluctuation calibration coefficient for reflectivity measurement, the monochromator screens light based on the acousto-optic effect of an acousto-optic crystal, and the EUV reflectivity meter is used for measuring the reflectivity of the EUV light source. It is ensured that the EUV reflectivity meter only receives light with the required wavelength; the EUV reflectivity meter serves as a measurement space of a Mo / Si reflector sample, mechanical design is adopted, the size of the EUV reflectivity meter is reduced, meanwhile, a collimation optical system is added, and the accuracy of a measurement result is improved. The invention further provides a measurement method, accurate measurement of the angular spectrum and the reflection spectrum of the Mo / Si reflector is achieved, an effective technology is provided for measurement and development of the Mo / Si reflector, and therefore the EUV photoetching technology is continuously improved.

An organic light emitting display panel and an organic light emitting display device include an encapsulation layer positioned on a substrate where an organic light emitting element is disposed, a plurality of color filters positioned on the encapsulation layer, an overcoat layer in an opaque color, positioned on the plurality of color filters and including a plurality of colored particles, and an adhesive layer positioned on the overcoat layer and having reduced external light reflectance and power consumption by adjusting the thickness of the overcoat layer or the thickness of the color filter layer for each subpixel and allowing the overcoat layer to differ in color from the plurality of color filter layers.

The present invention provides a reinforcing film, which is a reinforcing film that can be attached to an optical component or an electronic component. When the optical component or the electronic component is detected through the reinforcing film, the change in reflectivity is suppressed and the detectability is not reduced. In addition, provided is: an optical component with a reinforcing film or an electronic component with a reinforcing film having such a reinforcing film. Furthermore, provided is: a reinforcing film with a surface protective film having a surface protective film in such a reinforcing film, and a method for using such a reinforcing film with a surface protective film. The reinforcing film according to an embodiment of the present invention is a reinforcing film comprising a substrate layer A1 and an adhesive layer A2, and the light reflectivity change rate at 580nm after the reinforcing film is stored in an environment of 60°C and 90% RH for 1 week is less than 2.0%.

A method for generating an image in a near-eye display may include operating a light source to emit the image as incident light. The light source may be configured such that incident light as received by the light reflecting elements compensates for the chromatic reflectance of the light reflecting elements. The method may include coupling the incident light into a light-transmitting substrate, thereby trapping the light between first and second major surfaces of the light-transmitting substrate by total internal reflection and coupling the light out of the substrate by the light reflecting elements having chromatic reflectance.

The present invention relates to an optical lens comprising a substrate and a multi-layer antireflection coating provided on at least one of the main surfaces of the substrate and comprising a stack of at least one layer having a high refractive index and at least one layer having a low refractive index, a spectral reflectance curve of the multi-layer antireflection coating for an angle of incidence in the range of 0 DEG to 15 DEG has a reflection peak centered on a wavelength in the range of 435-450 nm and having a maximum reflectance of less than or equal to 30% and a full width at half maximum of less than or equal to 90 nm, and a local reflectance minimum in the range of 380-420 nm of less than or equal to 2% and a multi-layer antireflection coating for the at least one major surface, the multi-layer antireflection coating providing the at least one major surface with: for an angle of incidence in the range of 0 to 15 degrees, the present invention relates to a light-emitting device comprising a light-emitting element, a light-emitting element, an average light reflection factor Rv of 380 nm to 780 nm of less than or equal to 2.5%, an average blue light reflection factor RmB1 of greater than or equal to 15% in the wavelength range of 420 nm to 450 nm of greater than or equal to 15%, an average blue light reflection factor RmB3 of greater than or equal to 15% in the wavelength range of 440 nm to 460 nm of greater than or equal to 15%, and a ratio RmB1 / RmB3 of less than or equal to 1.

An object to be solved by the present invention is to provide a multilayer coating film forming method by which a multilayer coating film having reduced nonuniformity and exhibiting excellent luster and high flip-flop properties can be formed. The present invention provides a multilayer coating film forming method characterized by including: applying an aqueous first colored paint (X) containing a color pigment (x1) and an effect pigment (x2) on an object to be coated to form a first colored coating film; applying an aqueous second colored paint (Y) containing a viscosity modifier (y1), a color pigment (y2), and an effect pigment (y3) to form a second colored coating film; applying a clear paint (Z) to form a clear coating film; and curing by heating, wherein a solid content of the aqueous second colored paint (Y) is in a range of 0.1 to 6 mass %, an average value of light transmittance of the second colored coating film is 1% or lower, and a difference |R(X)−R(S)| between an average value of light reflectance of the first colored coating film and an average value of light reflectance of the multilayer coating film is 5% or lower.

The invention discloses a semiconductor resistivity nondestructive testing method and system based on modulation light reflection, relates to the technical field of semiconductor resistivity detection, and aims to accurately measure a modulation component delta R / R of light reflectivity through a light reflection modulation signal so as to calculate the semiconductor resistivity and further realize quantitative measurement of the semiconductor resistivity. The sensor has ultrahigh sensitivity, can detect tiny carrier concentration change, and is very sensitive to electrical properties of surface and near-surface areas; meanwhile, the spatial resolution is high, and the micron-scale light spot at the sample is suitable for micro-area measurement; a complete optical method does not cause any damage to the sample; various types of samples can be measured; the measuring speed is fast, and the system can be easily integrated in a production line for real-time monitoring.

The invention relates to a method for determining an optical reflectivity of a curved surface (3) of an optical test object (2), in particular a mirror or lens, wherein the reflectivity (R) is determined using a reflectometer (4), in particular an EUV reflectometer, which comprises a light source (5) and a light sensor (6), and wherein, in order to determine the reflectivity, a light beam (7) from the light source (6) reflected on the surface (3) is captured by the light sensor (6) at least at a predetermined distance from the test object (2). According to the invention: the light sensor (6) is displaced at least once for a calibration process such that the reflected light beam (7) is captured at varying distances (x) from the surface (3) of the test object (2), and a reflectivity (R) is determined for each distance (x); and a baseline reflectivity of the surface (3) is determined depending on the captured reflectivities (R).

The application relates to the technical field of intelligent household appliances, and discloses a method for heat dissipation of an air conditioner, which comprises the following steps: determining whether freezing phenomenon exists at a drain outlet according to the change condition of the light reflectivity at the drain outlet; in the case that freezing phenomenon exists, starting a semiconductor heat dissipation fin and increasing the rotating speed of a circulating pump body; and in the case that freezing phenomenon does not exist, adjusting the rotating speed of the circulating pump body according to the temperature of an aluminum base plate. Heat is efficiently guided to the outdoor unit chassis through a heat conduction medium in a heat conduction pipeline to perform ice removal or defrosting, the clogging problem caused by the icing or frosting of the drain outlet is avoided, the utilization rate of energy is improved, the flow rate of the heat conduction medium in the heat conduction pipeline is adjusted based on the overall temperature of the heating component, the heat conduction efficiency of the heat conduction pipeline is matched with the overall temperature of the heating component, and the electric control box of the air conditioner can be timely heat dissipated. The application further discloses a device for heat dissipation of an air conditioner, an air conditioner and a storage medium.

A light scattering device is provided which is capable of suppressing heat generation in and around a light-exiting part and simultaneously limiting an irradiation area. A light scattering device 1 according to the present invention is provided with an optical fiber 10 comprising a core 10a positioned radially in the center and a sheath 10b positioned at the outer periphery of the core 10a, wherein the light scattering device 1 causes light entering from a proximal end of the optical fiber 10 to be emitted from a distal side T of the optical fiber 10.The optical fiber 10 is made of plastic and comprises: an optical transmission element 11 for transmitting the light entering from the proximal end to a distal end; and a light exit element 12, which allows the light transmitted by the light transmission element 11 to be emitted from an outer circumferential surface on the distal side T. The light exit element 12 is treated to suppress heat generation and comprises a reflective element 21 with a light reflectance of 80% or more in an area that does not form the light exit aperture 22 on the outer circumferential surface of the light exit element 12 and in a distal end surface TE. The reflective element 21 contains particles with light-reflecting properties, wherein the particles contain barium sulfate.