TWI795265B

TWI795265B - Annular light emitting device and photography method using the same

Info

Publication number: TWI795265B
Application number: TW111113208A
Authority: TW
Inventors: 蘇忠傑
Original assignee: 國立臺灣科技大學
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2023-03-01
Also published as: TW202340645A

Abstract

An annular light emitting device includes a plurality of light emitting elements with polarization characteristics and arranged in a ring shape. The light emitting elements are arranged around a central axis of the annular light emitting device to form at least one ring-shaped light emitting configuration with radial polarization. When using the annular light emitting device to illuminate an object placed on the central axis, the polarized light emitted from each of the light emitting elements is incident on the surface of the object at a specific angle of incidence, thereby suppressing the generation of the reflected light from the surface of the object, so as to improve both the illuminous intensity and uniformity on the surface of the object, and reduce the glare and shadow effects. When an image forming device with focusing lens is installed on the central axis of the annular light emitting device to photograph the object, a higher-resolution image is obtained by adjusting the incident angle of the polarized light.

Description

環形發光裝置及應用該裝置的攝影方法Annular light-emitting device and photographing method using the device

本發明是關於一種環形發光裝置及應用該裝置的攝影方法，特別是關於一種能抑制被照物體產生表面反射從而提高影像解析度的環形發光裝置以及攝影方法。The present invention relates to a ring-shaped light emitting device and a photographing method using the same, in particular to a ring-shaped light-emitting device and a photographing method capable of suppressing surface reflections of objects to be illuminated so as to improve image resolution.

環形光源為一種非同軸照明，一般是以高亮度發光二極體(light emitting diode，簡稱為LED)密集排列在環狀的錐面、曲面或平面形成不同照射角度的環形發光區。這些環形發光區可以在平行於鏡頭光軸的方向上，以錐形匯聚或水平照射等不同方式，以形成環形多角度照明且高亮度的照明區域以涵蓋被照物體，以消除照明的死角與陰影。The ring light source is a kind of non-coaxial lighting. Generally, high-brightness light emitting diodes (light emitting diodes, referred to as LEDs) are densely arranged on a ring-shaped conical surface, a curved surface or a plane to form a ring-shaped light-emitting area with different irradiation angles. These ring-shaped light-emitting areas can be in different ways such as conical convergence or horizontal illumination in the direction parallel to the optical axis of the lens to form a ring-shaped multi-angle lighting and high-brightness lighting area to cover the illuminated object, so as to eliminate the dead angle of lighting and shadow.

環形光源可用於一般攝影照明補光、顯微鏡照明及工業上的檢測照明。隨著紅外光攝影技術和各種血管光學成像技術如光學同調斷層掃描術（Optical Coherence Tomography, OCT）的出現，讓利用光學技術應用於血管可視化(vessel visualization)成爲了可能，其中關鍵技術的光源性質與成像裝置之相對幾何位置尤為重要。The ring light source can be used for general photographic lighting, microscope lighting and industrial inspection lighting. With the advent of infrared light photography technology and various vascular optical imaging technologies such as Optical Coherence Tomography (OCT), it has become possible to use optical technology for vessel visualization. The key technology is the light source properties The relative geometric position with the imaging device is particularly important.

近紅外光是能穿透皮膚組織最深的光波，其穿透深度能達數十毫米。然而，以一般的近紅外光(near infrared)光源照射皮膚時，從皮膚表面的反射光有40-70%，這些表面反射光起源於皮膚的表面結構如角質層、生物質如表皮色素與毛髮等但不包含皮下組織的影像資訊，對血管成像系統來說是背景雜訊，降低了血管影像的解析度。因此，若能有效減少皮膚表面反射光如採用正交偏振光譜成像(orthogonal polarization spectral imaging)，則可以提高皮下組織的血管影像品質。Near-infrared light is the light wave that can penetrate the deepest skin tissue, and its penetration depth can reach tens of millimeters. However, when the skin is irradiated with a general near infrared light source, 40-70% of the reflected light from the skin surface originates from the surface structure of the skin such as the stratum corneum, biomass such as epidermal pigment and hair The image information such as but not including the subcutaneous tissue is background noise for the vascular imaging system, which reduces the resolution of the vascular image. Therefore, if the light reflected from the skin surface can be effectively reduced, such as using orthogonal polarization spectral imaging (orthogonal polarization spectral imaging), the image quality of blood vessels in the subcutaneous tissue can be improved.

另一方面，若能增加光源的照度與均勻性，也有助於降低被照物體的眩光與陰影，進而提高影像的品質。例如，美國專利US 6454437提出環形 LED 光源利用菲涅爾透鏡(Fresnel Lens)混合與控制徑向方向上光束的傳播，以使得被照物體表面上有均勻的照度。美國專利公開號US 20100315816提出環形無陰影光源照射方式則是在環形光源的基礎上，增加一層漫射板(diffuser)，使其射出的光線方向變得隨機化 (randomization) 以產生均匀柔和且無眩光效應。On the other hand, if the illuminance and uniformity of the light source can be increased, it will also help to reduce the glare and shadow of the illuminated object, thereby improving the image quality. For example, U.S. Patent US 6454437 proposes that a ring-shaped LED light source uses a Fresnel lens (Fresnel Lens) to mix and control the propagation of light beams in the radial direction, so that there is uniform illumination on the surface of the illuminated object. U.S. Patent Publication No. US 20100315816 proposes that the ring-shaped shadowless light source illumination method is to add a layer of diffuser (diffuser) on the basis of the ring-shaped light source, so that the direction of the emitted light becomes randomized (randomization) to produce a uniform, soft and shadowless light source. glare effect.

然而，習知的環形光源僅靠菲涅爾透鏡或漫射板等二次光學元件去改變輸出光束的傳播方向，雖然可以改善照明光源之照度均勻性，但卻降低了照度。However, conventional ring light sources only rely on secondary optical elements such as Fresnel lenses or diffusers to change the propagation direction of the output light beams, which can improve the uniformity of illumination of the illumination source, but reduce the illumination.

有鑑於此，本案發明人利用環形光源提供一種消除被照物體表面反射光的機制，期能解決光源之均勻性與照度兩者無法同時增加的問題，尤其是希望能用在人體血管可視化技術，且為非同軸照明提供更多的選擇。In view of this, the inventor of this case uses the ring light source to provide a mechanism to eliminate the reflected light on the surface of the illuminated object, hoping to solve the problem that the uniformity of the light source and the illuminance cannot be increased at the same time, especially hope that it can be used in the human blood vessel visualization technology, And provide more options for non-coaxial lighting.

本發明的一目的在於提供一種環形發光裝置，能抑制被照物體表面的反射光生成，以減弱被照物體的表面反射；並且，可同時增加照度與均勻性，並降低眩光與陰影，進而提高影像解析度。An object of the present invention is to provide a ring-shaped lighting device, which can suppress the generation of reflected light on the surface of the object to be illuminated, so as to weaken the surface reflection of the object to be illuminated; and at the same time, it can increase the illuminance and uniformity, and reduce glare and shadows, thereby improving Image resolution.

本發明的一目的在於提供一種應用環形發光裝置的攝影方法，適合用在人體血管可視化，並可改善皮下組織的影像解析度。An object of the present invention is to provide a photography method using a ring-shaped light emitting device, which is suitable for visualization of human blood vessels and can improve the image resolution of subcutaneous tissue.

為了達到上述目的，本發明提供一種環形發光裝置，其包括一平面電路基板及複數發光元件。平面電路基板具有一通孔，其大小適合裝設一具有鏡頭的成像裝置。這些發光元件設置於平面電路基板上，並環繞通孔的一中心軸而排列成至少一環形發光組態。發光元件可以產生在可見光或紅外光波長範圍的偏振光。每一發光元件的偏振光具有單一電場偏振方向並包括一部分偏振光束其行進方向與中心軸形成一特定角度，例如：此特定角度可選自一包括布魯斯特角的有效入射角範圍。這些發光元件的電場偏振方向各自對準中心軸並且與通孔的一半徑延伸方向平行。當這些發光元件各自的該部分偏振光束以該電場偏振方向及該特定角度照射一位於中心軸上的物體時，能抑制物體表面生成反射光，使物體的表面反射被減弱。In order to achieve the above object, the present invention provides a ring-shaped light emitting device, which includes a planar circuit substrate and a plurality of light emitting elements. The planar circuit substrate has a through hole whose size is suitable for installing an imaging device with a lens. These light-emitting elements are arranged on the planar circuit substrate and arranged in at least one ring-shaped light-emitting configuration around a central axis of the through hole. Light emitting elements can generate polarized light in the visible or infrared wavelength range. The polarized light of each light-emitting element has a single electric field polarization direction and includes a part of the polarized light beam whose travel direction forms a specific angle with the central axis, for example, the specific angle can be selected from an effective incident angle range including Brewster's angle. The electric field polarization directions of the light emitting elements are respectively aligned with the central axis and parallel to a radial extension direction of the through hole. When the part of the polarized light beams of the light emitting elements irradiates an object on the central axis with the electric field polarization direction and the specific angle, it can suppress the reflected light from the surface of the object and weaken the surface reflection of the object.

在一實施例中，每一發光元件包括一發光二極體封裝結構及一線偏振片，線偏振片覆蓋於發光二極體封裝結構的一光出射面上，以使發光元件能提供線偏振光。In one embodiment, each light-emitting element includes a light-emitting diode package structure and a linear polarizer, and the linear polarizer covers a light-emitting surface of the light-emitting diode package structure, so that the light-emitting element can provide linearly polarized light .

在一實施例中，平面電路基板的表面佈設有至少一環形驅動電路以供驅動這些發光元件，其中環形發光組態中的複數發光元件佈設於環形驅動電路的表面。In one embodiment, at least one ring-shaped driving circuit is arranged on the surface of the planar circuit substrate for driving the light-emitting elements, wherein the plurality of light-emitting elements in the ring-shaped light-emitting configuration are arranged on the surface of the ring-shaped driving circuit.

在一實施例中，上述的環形發光裝置更包括一散熱基板設置在平面電路基板上，以增加散熱效果，其中散熱基板與複數發光元件分別裝設在平面電路基板的兩相對表面。In one embodiment, the above ring-shaped light emitting device further includes a heat dissipation substrate disposed on the planar circuit substrate to increase the heat dissipation effect, wherein the heat dissipation substrate and the plurality of light emitting elements are respectively installed on two opposite surfaces of the planar circuit substrate.

在一實施例中，該至少一環形發光組態包括以通孔的中心軸為環心而形成同心圓排列的複數環形發光組態。In one embodiment, the at least one ring-shaped light-emitting configuration includes a plurality of ring-shaped light-emitting configurations arranged concentrically around the central axis of the through hole.

在一實施例中，複數發光元件提供一光波長組合，該光波長組合與物體不同部位的光學性質有關。In one embodiment, the plurality of light emitting elements provide a combination of light wavelengths that is related to the optical properties of different parts of the object.

本發明還提供一種應用環形發光裝置的攝影方法，包括：將一具有鏡頭的成像裝置裝設於前述的環形發光裝置的通孔內，且使該通孔的該中心軸對準該成像裝置的鏡頭之光軸，並且調整環形發光組態中的所有發光元件發出的該部分偏振光束對物體表面的一入射角，直到物體的表面反射被減至最弱時，即皮下組織影像最清晰狀態。The present invention also provides a photography method using an annular light emitting device, comprising: installing an imaging device with a lens in the through hole of the aforementioned annular light emitting device, and aligning the central axis of the through hole with the imaging device. The optical axis of the lens, and adjust the incident angle of the part of the polarized light beam emitted by all the light-emitting elements in the ring-shaped light-emitting configuration to the surface of the object until the surface reflection of the object is reduced to the weakest, that is, the image of the subcutaneous tissue is the clearest state.

在一實施例中，前述攝影方法更包括：將每一發光元件的線偏振片進行一特定排列，使得複數發光元件的等電場偏振方向各自對準中心軸並且與通孔的一半徑延伸方向平行。In one embodiment, the aforementioned photographing method further includes: arranging the linear polarizers of each light-emitting element in a specific arrangement, so that the polarization directions of the equi-electric fields of the plurality of light-emitting elements are respectively aligned with the central axis and parallel to a radial extension direction of the through hole .

在一實施例中，前述攝影方法更包括：以布魯斯特角為一參考值，並且選擇性地改變該環形發光組態的半徑大小或改變被照物體在中心軸上的位置，以調整該部分偏振光束對該物體的該入射角。In one embodiment, the aforementioned photography method further includes: taking Brewster's angle as a reference value, and selectively changing the radius of the ring-shaped lighting configuration or changing the position of the illuminated object on the central axis, so as to adjust the part This angle of incidence of a polarized beam of light on an object.

本發明的環形發光裝置是以多個具有偏振特性的發光元件圍繞一中心軸而配置成徑向偏振的環形發光組態，藉此將中心軸上各個位置的照度與光均勻度兩者同時提高。在使用此環形發光裝置照射一置於其中心軸上的物體時，將每個發光元件發出的偏振光其射入該物體的入射角調整至一特定角度，即可抑制該物體表面的反射光生成，且能同時改善該物體表面的照度與光均勻度，以降低眩光與陰影。將一具有鏡頭的成像裝置裝設於此環形發光裝置的通孔，並使鏡頭的光軸對準通孔的中心軸用以對該物體進行攝影時，可通過調整前述入射角而獲得較高解析度的影像。The annular light-emitting device of the present invention is a radially polarized annular light-emitting configuration with a plurality of light-emitting elements with polarization characteristics surrounding a central axis, thereby improving both the illuminance and light uniformity at each position on the central axis . When using this annular light emitting device to illuminate an object placed on its central axis, the incident angle of the polarized light emitted by each light emitting element entering the object is adjusted to a specific angle, which can suppress the reflected light on the surface of the object Generated, and can simultaneously improve the illumination and light uniformity of the surface of the object to reduce glare and shadows. When an imaging device with a lens is installed in the through hole of the annular light emitting device, and the optical axis of the lens is aligned with the central axis of the through hole to take pictures of the object, a higher angle of incidence can be obtained by adjusting the aforementioned incident angle. resolution image.

有關本發明之前述及其他技術內容、特點與功效，在以下配合參考圖式之一較佳實施例的詳細說明中，將可清楚的呈現。以下實施例中所提到的方向用語，例如：上、下、左、右、前或後等，僅是用於參照隨附圖式的方向。因此，該等方向用語僅是用於說明並非是用於限制本發明。The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only used to refer to the directions of the accompanying drawings. Therefore, these directional terms are used for illustration only and not for limiting the present invention.

本發明是通過將多個具有偏振特性的發光元件配置成徑向偏振(radial polarization)的環形發光組態，再以徑向偏振與環形發光為前提，將每個發光元件射出的偏振光所組成的一環形光源其射入被照物體的入射角調整至一特定角度，即可抑制被照物體表面的反射光生成。值得注意的是，本發明是直接抑制表面反射的來源，而不是在已產生表面反射後，再以其他的光學元件來減弱或消除表面反射光量例如習知的正交偏振光譜成像(orthogonal polarization spectral imaging)方式。因此，此一徑向偏振與正交偏振方式是不同的利用偏振光移除物體表面反射光的成像技術手段。The present invention arranges a plurality of light-emitting elements with polarization characteristics into a circular light-emitting configuration with radial polarization, and on the premise of radial polarization and ring-shaped light emission, the polarized light emitted by each light-emitting element is composed of The incident angle of a ring light source incident on the object to be illuminated is adjusted to a specific angle, which can suppress the generation of reflected light on the surface of the object to be illuminated. It is worth noting that the present invention directly suppresses the source of surface reflection, rather than using other optical elements to weaken or eliminate the amount of surface reflected light after surface reflection has occurred, such as the conventional orthogonal polarization spectral imaging (orthogonal polarization spectral imaging) imaging) mode. Therefore, the radial polarization and the orthogonal polarization are different imaging techniques that use polarized light to remove light reflected from the surface of an object.

請同時參照圖1及圖2，圖1是本發明之一實施例的環形發光裝置側面示意圖；圖2為圖1所示的環形發光裝置的正面示意圖。環形發光裝置100基本包括一平面電路基板120及複數發光元件140。平面電路基板120具有一通孔122。通孔122一般為圓孔，其具有一經過通孔122之幾何中心的中心軸CA。可以理解的是，通孔122的孔緣上的任一點與圓心的連線其延伸方向皆不同，因此通孔122可以定義出多個延伸方向不同的半徑122R。通孔122的大小適合裝設一成像裝置200 (例如CCD 或CMOS 相機) 及/或其鏡頭220，例如：攝影鏡頭或顯微鏡頭。Please refer to FIG. 1 and FIG. 2 at the same time. FIG. 1 is a side view of an annular light emitting device according to an embodiment of the present invention; FIG. 2 is a front view of the ring light emitting device shown in FIG. 1 . The ring light emitting device 100 basically includes a planar circuit substrate 120 and a plurality of light emitting elements 140 . The planar circuit substrate 120 has a through hole 122 . The through hole 122 is generally a circular hole, which has a central axis CA passing through the geometric center of the through hole 122 . It can be understood that the extending direction of the line connecting any point on the edge of the through hole 122 with the center of the circle is different, so the through hole 122 can define a plurality of radii 122R with different extending directions. The size of the through hole 122 is suitable for installing an imaging device 200 (such as a CCD or CMOS camera) and/or its lens 220, such as a photographic lens or a microscope lens.

複數發光元件140設置於平面電路基板120上，並環繞通孔122的中心軸CA而排列成至少一環形發光組態，用以在平面電路基板120上形成單一或多個環形發光區。在圖2中清楚地顯示以通孔122的中心軸CA上的一點為環心而形成同心圓排列的多個環形發光組態110，每一環形發光組態110包括呈環形排列的多個發光元件140及其環形驅動電路160。在本實施例中，複數發光元件140各自具有偏振特性，能產生在可見光或紅外光波長範圍的偏振光PL，特別是紅光與近紅外光適用於人體血管可視化(vessel visualization)。每一發光元件140所產生的偏振光PL可能包括多個不同出射方向的偏振光束，這些偏振光束皆具有同一電場偏振方向PD(如圖1及圖2中每個雙箭號所示的方向)。如圖1，每一發光元件140的偏振光PL包括一部分偏振光束PL1射向一置於中心軸CA的物體300，該部分偏振光束PL1 (在下文中也稱為「入射光束 PL1」)的行進方向與中心軸CA形成一入射角 A1。在入射光束 PL1的光路徑上的每個位置都有電場偏振向量指向中心軸CA，此一徑向偏振(radial polarization)的環形發光組態110可產生比傳統的線性偏振(linear polarization)或圓偏振(circular polarization)光束在通孔122的中心軸CA (本實施例的中心軸CA與鏡頭220的光軸重合)上有更強的聚焦效應。以一習知的線性偏振環形光源為例，在一線偏振方向平行於入射面(包含入射光束與光軸的平面)的線偏振光束傳播時，由於其偏振方向一致，各方向的光束偏振或電場向量在聚焦處皆平行，因此電場向量會相疊加，這導致線性偏振光束在聚焦處不能提供最小光斑尺寸；但是在一線偏振方向為平行於入射面(包含入射光束與光軸的平面)且對光軸旋轉對稱的線偏振光束傳播時，在其聚焦處各個方向的光束偏振或電場向量互相不平行甚至相反，所以有部分電場向量會相互干涉抵消；因此，徑向偏振光束可以提供可達到較一般線偏振光束小的光斑尺寸。本發明採用徑向偏振的環形發光組態110可以提供線偏振方向旋轉對稱的光束，所以可獲得更小的聚焦光斑尺寸，且能提高光斑中央處的照度，進而能使中心軸CA上各個位置的照度與光均勻度兩者皆提高。A plurality of light emitting elements 140 are disposed on the planar circuit substrate 120 and arranged in at least one annular light emitting configuration around the central axis CA of the through hole 122 to form a single or multiple annular light emitting regions on the planar circuit substrate 120 . In FIG. 2 , it clearly shows a plurality of ring-shaped light-emitting configurations 110 arranged concentrically around a point on the central axis CA of the through hole 122. Each ring-shaped light-emitting configuration 110 includes a plurality of light-emitting configurations arranged in a ring. Component 140 and its ring drive circuit 160 . In this embodiment, each of the plurality of light emitting elements 140 has polarization characteristics, and can generate polarized light PL in the wavelength range of visible light or infrared light, especially red light and near infrared light are suitable for human vessel visualization. The polarized light PL generated by each light emitting element 140 may include a plurality of polarized light beams with different outgoing directions, and these polarized light beams all have the same electric field polarization direction PD (the direction shown by each double arrow in FIGS. 1 and 2 ) . As shown in Fig. 1, the polarized light PL of each light-emitting element 140 includes a part of the polarized light beam PL1 directed at an object 300 placed on the central axis CA. An incident angle A1 is formed with the central axis CA. Every position on the optical path of the incident light beam PL1 has an electric field polarization vector pointing to the central axis CA, and this radial polarization (radial polarization) annular light-emitting configuration 110 can produce more than conventional linear polarization (linear polarization) or circular The circular polarization beam has a stronger focusing effect on the central axis CA of the through hole 122 (the central axis CA in this embodiment coincides with the optical axis of the lens 220 ). Taking a known linearly polarized ring light source as an example, when a linearly polarized beam with a linear polarization direction parallel to the incident plane (the plane containing the incident beam and the optical axis) propagates, since the polarization directions are consistent, the beam polarization or electric field in each direction The vectors are all parallel at the focus, so the electric field vectors will be superimposed, which causes the linearly polarized beam to fail to provide the minimum spot size at the focus; however, the linear polarization direction is parallel to the incident plane (the plane containing the incident beam and the optical axis) When a linearly polarized beam with optical axis rotation symmetry propagates, the beam polarization or electric field vectors in all directions at its focus are not parallel or even opposite to each other, so some electric field vectors will interfere with each other and cancel each other; therefore, radially polarized beams can provide better Generally linearly polarized beams have small spot sizes. The present invention adopts radially polarized annular light-emitting configuration 110 to provide rotationally symmetric light beams in the linear polarization direction, so a smaller focused spot size can be obtained, and the illuminance at the center of the spot can be improved, thereby enabling all positions on the central axis CA to Both illuminance and light uniformity are improved.

值得注意的是，這些發光元件140的電場偏振方向PD各自對準中心軸CA並且與通孔122所定義的多個半徑延伸方向RD (也稱為「徑向RD」)之其一平行。在圖2中，每個發光元件140中的圓點及其所連接的短箭號代表其所發出的入射光束PL1的行進方向是射出紙面並斜向中心軸CA匯聚，而所有入射光束PL1的偏振方向PD皆平行於紙面且指向中心軸CA，如每個雙箭號所示。換言之，每一發光元件140的電場偏振方向PD都是不同的，但是都指向中心軸CA，也都對應地與通孔122的某一半徑延伸方向RD平行，形成一種徑向偏振(radial polarization)的環形發光組態110。It is worth noting that the electric field polarization directions PD of the light emitting elements 140 are respectively aligned with the central axis CA and parallel to one of the plurality of radial extension directions RD (also referred to as “radial direction RD”) defined by the through hole 122 . In FIG. 2 , the dots in each light-emitting element 140 and the short arrows connected to them represent that the incident light beam PL1 emitted by it travels in the direction of exiting the paper and converges obliquely toward the central axis CA, and all incident light beams PL1 The polarization directions PD are all parallel to the paper and point to the central axis CA, as indicated by each double arrow. In other words, the electric field polarization directions PD of each light-emitting element 140 are different, but all point to the central axis CA, and are correspondingly parallel to a certain radial direction RD of the through hole 122, forming a radial polarization. Ring light configuration 110 of .

如圖1，若入射角 A1的大小未經適當調整，在物體300的表面可能產生反射光320。如圖1A，當這些發光元件140各自發出的入射光束PL1以其電場偏振方向PD及一特定角度A2入射物體300時，會形成一種抑制物體300表面的反射光320生成的機制，而使物體300的表面反射被減弱，甚至完全消除。此特定角度A2例如是布魯斯特角 (Brewster's angle)及其附近的一有效入射角範圍內的任一角度。進一步來說，本發明是在表面反射光320的生成過程中即加以抑制，亦即抑制表面反射的來源，而不是在表面反射光320生成之後，才在物體300表面與鏡頭220之間或是表面反射的光路徑中加上其他的光學元件來減少進入鏡頭220的表面反射光量例如習知的正交偏振光譜成像(orthogonal polarization spectral imaging)。As shown in FIG. 1 , if the incident angle A1 is not properly adjusted, reflected light 320 may be generated on the surface of the object 300 . As shown in Figure 1A, when the incident light beams PL1 emitted by these light emitting elements 140 are incident on the object 300 with their electric field polarization direction PD and a specific angle A2, a mechanism will be formed to suppress the generation of reflected light 320 on the surface of the object 300, so that the object 300 Surface reflections are weakened or even completely eliminated. The specific angle A2 is, for example, any angle within an effective incidence angle range of Brewster's angle and its vicinity. Further, the present invention suppresses the surface reflection light 320 during the generation process, that is, suppresses the source of the surface reflection, rather than between the surface of the object 300 and the lens 220 or between the surface reflection light 320 after the surface reflection light 320 is generated. Other optical elements are added to the surface-reflected light path to reduce the amount of surface-reflected light entering the lens 220 , such as conventional orthogonal polarization spectral imaging.

一般而言，若是使用自然光以布魯斯特角射入物體表面時，反射光只會包含偏振方向垂直於入射面的線偏振光而不會包含偏振方向平行於入射面的線偏振光。然而，本發明的環形發光裝置100只提供了偏振方向平行於入射面的入射光束PL1，例如：本案的入射光束PL1的偏振方向PD平行於通孔122的徑向RD，因此也能與物體300的部分表面平行。當其以布魯斯特角射入被照物體300的該部分表面時，因為入射光束PL1沒有偏振方向垂直於入射面的成分，故對於偏振方向平行於入射面的入射光束無法在物體300表面產生偏振方向平行於入射面反射光320。因此，當以本發明的環形發光裝置100照射人體表面時，即使人體皮膚表面可能不甚平整，仍可使皮膚表面的反射光量相對地遠小於皮下組織發出的散射光量，此時成像裝置200的鏡頭220所收集到的主要是皮下組織發出的散射光，因而能更清楚地呈現皮下血管分布。Generally speaking, if natural light is used to enter the surface of the object at Brewster's angle, the reflected light will only include linearly polarized light whose polarization direction is perpendicular to the incident plane and will not include linearly polarized light whose polarization direction is parallel to the incident plane. However, the annular light emitting device 100 of the present invention only provides the incident light beam PL1 whose polarization direction is parallel to the incident surface. part of the surface is parallel. When it enters the part of the surface of the illuminated object 300 at the Brewster angle, because the incident light beam PL1 has no component whose polarization direction is perpendicular to the incident surface, the incident light beam whose polarization direction is parallel to the incident surface cannot be polarized on the surface of the object 300. The direction of the reflected light 320 is parallel to the plane of incidence. Therefore, when the ring-shaped light-emitting device 100 of the present invention is used to irradiate the human body surface, even though the human skin surface may not be very smooth, the amount of reflected light on the skin surface can still be relatively much smaller than the amount of scattered light emitted by the subcutaneous tissue. At this time, the imaging device 200 What the lens 220 collects is mainly the scattered light emitted by the subcutaneous tissue, so the subcutaneous blood vessel distribution can be presented more clearly.

在一更具體的實施例中，平面電路基板120的表面佈設有至少一環形驅動電路160。每一環形發光組態110中的多個發光元件140佈設於環形驅動電路160的表面。同一環形發光組態110中的每個發光元件140經由其環形驅動電路160而彼此電性連接。可以理解的是，電性連接的方式可以設計成串聯、並聯或其組合。此外，環形發光裝置100更包括一散熱基板180，此散熱基板180與複數發光元件140分別裝設在平面電路基板120的兩相對表面，以促進熱消散。In a more specific embodiment, at least one ring-shaped driving circuit 160 is disposed on the surface of the planar circuit substrate 120 . A plurality of light-emitting elements 140 in each ring-shaped light-emitting configuration 110 are disposed on the surface of the ring-shaped driving circuit 160 . Each light-emitting element 140 in the same ring-shaped light-emitting configuration 110 is electrically connected to each other via its ring-shaped driving circuit 160 . It can be understood that the way of electrical connection can be designed as series connection, parallel connection or a combination thereof. In addition, the annular light emitting device 100 further includes a heat dissipation substrate 180 , and the heat dissipation substrate 180 and the plurality of light emitting elements 140 are respectively installed on two opposite surfaces of the planar circuit substrate 120 to promote heat dissipation.

發光元件140可以選用發光二極體(LED)、雷射二極體、有機發光二極體(OLED)、平面發光源以及發光燈泡等光源。在上述光源中，有些本身具有產生偏振光的性質；有些本身是非偏振光源，例如：LED。若要使用非偏振光源形成具備偏振特性的發光元件，可應用線偏振片(linear polarizer)、偏振板或偏振膜來產生偏振光性質。線偏光片的種類可依據其結構分為反射式金屬線柵偏振片(wire grid polarizer)、薄膜偏振片與由碘或染料所製成的穿透型薄膜偏振片。在一實施例中，每一發光元件140包括一發光二極體封裝結構142及一線偏振片144，線偏振片144覆蓋於發光二極體封裝結構142的一光出射面上。可以理解的是，為了配合使用時的需求，同一環形發光區中的多個發光元件140可以由多個具有相同、部分不同或全部不同波長的發光元件140所組成。不同的環形發光區可以發出相同或不同波長的偏振光PL。The light emitting element 140 can be selected from light emitting diodes (LEDs), laser diodes, organic light emitting diodes (OLEDs), planar light sources, light bulbs and other light sources. Among the above-mentioned light sources, some have the property of producing polarized light; some are non-polarized light sources, such as LEDs. To use a non-polarized light source to form a light-emitting device with polarized properties, a linear polarizer, a polarizing plate, or a polarizing film can be used to generate polarized light properties. The types of linear polarizers can be divided into reflective metal wire grid polarizers, film polarizers, and transmissive film polarizers made of iodine or dyes according to their structures. In one embodiment, each light emitting element 140 includes a light emitting diode package structure 142 and a linear polarizer 144 , and the linear polarizer 144 covers a light emitting surface of the light emitting diode package structure 142 . It can be understood that, in order to meet the needs of use, the multiple light emitting elements 140 in the same ring-shaped light emitting area can be composed of multiple light emitting elements 140 with the same, partially different or all different wavelengths. Different annular light emitting areas can emit polarized light PL with the same or different wavelengths.

如圖3所示，本發明還提供一種應用環形發光裝置100的攝影方法，包括：將具有鏡頭220的成像裝置200裝設於前述的環形發光裝置100的通孔122內且使中心軸CA對準成像裝置200的鏡頭220之光軸，並且可經由改變環形發光裝置100上的環形發光區半徑或通孔122的半徑122R大小並且參考布魯斯特角及其相近的角度，以調整部分偏振光束PL射入置於中心軸CA上的物體300的入射角A1，直到物體300的表面反射被減弱。例如：提供多個具有不同通孔半徑122R的環形發光裝置100，以便在攝影時進行替換；或是直接改變環形發光組態110的半徑。經由此攝影方法，可以增加被照物體300表面照度、均勻度與其影像的解析度，同時可明顯地減弱眩光及陰影對影像的影響。As shown in FIG. 3 , the present invention also provides a photographing method using the annular light emitting device 100 , including: installing the imaging device 200 with the lens 220 in the through hole 122 of the aforementioned annular light emitting device 100 and aligning the central axis CA to The optical axis of the lens 220 of the imaging device 200, and the partially polarized light beam PL can be adjusted by changing the radius of the ring-shaped light-emitting area on the ring-shaped light-emitting device 100 or the radius 122R of the through hole 122 and referring to the Brewster angle and its close angles. Incidence angle A1 of the object 300 placed on the central axis CA until the surface reflection of the object 300 is attenuated. For example: providing multiple ring-shaped light emitting devices 100 with different through-hole radii 122R for replacement during photography; or directly changing the radius of the ring-shaped light emitting configuration 110 . Through this photography method, the illumination and uniformity of the surface of the illuminated object 300 and the resolution of its image can be increased, and at the same time, the influence of glare and shadows on the image can be significantly reduced.

可以理解的是，依據線偏振片144的結構，可將每一發光元件140的線偏振片144進行一特定排列，使得這些發光元件140的電場偏振方向PD各自對準中心軸CA並且與通孔122的半徑延伸方向RD平行。It can be understood that, according to the structure of the linear polarizer 144, the linear polarizer 144 of each light-emitting element 140 can be arranged in a specific way, so that the electric field polarization directions PD of these light-emitting elements 140 are respectively aligned with the central axis CA and aligned with the through hole The radial extension direction RD of 122 is parallel.

使用光學模擬分析傳統與本發明之環形發光裝置100之輻射照度比較，可看出傳統非偏振LED 環形燈光型呈現高斯光形的照度分布與一般LED燈照明光型類似。而本發明採用的線偏振 LED 發光元件140在經過環形發光組態的排列設計後會產生徑向偏振的效果，讓線偏振LED 發光元件140在光束橫截面上之電場偏振方向PD與環形徑向RD平行，使得徑向偏振的LED環形發光裝置100的照度分佈較傳統環形LED光源的高斯光束分布呈現在光軸上的光斑聚焦效應，並可降低被照物體300的表面散射，所以經過徑向偏振後的LED環形發光裝置100具有可增加被照物體300的照度、均勻度與影像解析度的效果。Using optical simulation to analyze the irradiance comparison between the traditional ring light emitting device 100 and the present invention, it can be seen that the traditional non-polarized LED ring light type presents a Gaussian light distribution similar to the general LED light type. However, the linearly polarized LED light-emitting element 140 adopted in the present invention will produce a radially polarized effect after being arranged in a ring-shaped light-emitting configuration, so that the electric field polarization direction PD of the linearly polarized LED light-emitting element 140 on the beam cross section is the same as the ring radial direction. RD is parallel, so that the illuminance distribution of the radially polarized LED ring-shaped light emitting device 100 is better than the Gaussian beam distribution of the traditional ring-shaped LED light source. The polarized LED annular lighting device 100 has the effect of increasing the illuminance, uniformity and image resolution of the illuminated object 300 .

如圖4，對於物體300上的同一個被照射位置而言，可同時將多個不同半徑的環形發光組態110 (例如內、外圈的環形發光組態)調整其環形偏振光入射角。例如：對某一圈可通過改變其環形發光組態110的半徑，將該圈的環形發光組態110內的所有發光元件140提供的入射光束PL1其入射角A1皆調成布魯斯特角，此時雖然其他圈的環形發光組態110的入射角A1只能接近布魯斯特角，但在布魯斯特角附近有一反射光幾乎是零的有效入射角範圍。例如圖4中在50至60度的入射角範圍內的入射光，其在物體300表面的反射光幾乎是零。As shown in FIG. 4 , for the same irradiated position on the object 300 , multiple annular light emitting configurations 110 with different radii (such as inner and outer ring light emitting configurations) can be adjusted at the same time to adjust their circularly polarized incident angles. For example: for a circle, by changing the radius of its ring-shaped light-emitting configuration 110, the incident light beam PL1 provided by all light-emitting elements 140 in the ring-shaped light-emitting configuration 110 can be adjusted to Brewster's angle. Although the incident angle A1 of the ring-shaped light-emitting configuration 110 of other circles can only be close to the Brewster's angle, there is an effective incident angle range where the reflected light is almost zero near the Brewster's angle. For example, in FIG. 4 , for the incident light within the incident angle range of 50 to 60 degrees, the reflected light on the surface of the object 300 is almost zero.

此外，不同波長，布魯斯特角也會因被照物體的折射率不同而稍有不同角度。本發明可依據入射光束PL1的波長及其折射率，求得對應的布魯斯特角。再依據布魯斯特角及通孔122與物體300之間的距離，調整環形發光組態110的半徑，使得大部分的入射光束PL1其入射角皆可符合布魯斯特角或落在該有效入射角範圍內。在一實施例中，可將通孔122的半徑122R進行調整，以改變某一圈的環形發光組態110的半徑，使同一環形發光組態110中的所有發光元件140的光入射角A1同時符合布魯斯特角，連帶地使其他的環形發光組態110的光入射角能落在該有效入射角範圍內。In addition, for different wavelengths, the Brewster's angle will also be slightly different due to the different refractive indices of the illuminated objects. The present invention can obtain the corresponding Brewster's angle according to the wavelength of the incident light beam PL1 and its refractive index. According to the Brewster angle and the distance between the through hole 122 and the object 300, adjust the radius of the annular light emitting configuration 110, so that the incident angle of most of the incident light beam PL1 can meet the Brewster angle or fall within the effective incident angle range Inside. In one embodiment, the radius 122R of the through hole 122 can be adjusted to change the radius of a circle of ring-shaped light-emitting configurations 110, so that the light incident angles A1 of all light-emitting elements 140 in the same ring-shaped light-emitting configuration 110 can be simultaneously According to Brewster's angle, incident angles of light of other annular light emitting configurations 110 can fall within the effective incident angle range.

參照圖5，在一實施例中，環形發光裝置100可使用不同波長之發光元件140以配合於不同攝影應用。除傳統攝影使用可見光波長外，環形發光裝置100也可應用於人體血管可視化，此時須採用近紅外光(700-1000nm)例如為780nm，以增加光束對於人體皮膚之穿透率以呈現皮膚表皮下的血管分布結構。而屬於可見光之紅光(波長範圍630-700 nm)對於皮膚穿透率小於紅外光，所以紅光之影像較易呈現皮膚表面結構，而紅外光則較易呈現皮膚表皮以下血管分布結構。另外紅光對於含氧血與缺氧血的吸收不同，對於含氧血的吸收小於缺氧血的吸收，所以可呈現靜脈血管但無法呈現動脈血管。相反的，近紅外光對於含氧血與缺氧血的吸收接近相同，所以可同時呈現靜脈與動脈血管。所以各環形使用之LED 之波長組合亦可依應用加以變化，例如：本發明之環形發光裝置100可同時具有不同半徑之環形發光組態110，各不同半徑之環形發光組態110可使用不同波長之偏振LED晶粒做為發光元件140，經由環形驅動電路160的控制以選擇性地呈現皮膚表面結構與皮下血管分布，以增加應用時的彈性。Referring to FIG. 5 , in one embodiment, the ring light emitting device 100 can use light emitting elements 140 with different wavelengths to match different photography applications. In addition to the use of visible light wavelengths in traditional photography, the ring light emitting device 100 can also be applied to the visualization of human blood vessels. In this case, near-infrared light (700-1000nm) such as 780nm must be used to increase the penetration rate of the light beam to human skin to present the skin epidermis The lower vascular distribution structure. Red light (wavelength range 630-700 nm), which belongs to visible light, has a lower skin penetration rate than infrared light, so the image of red light is more likely to show the surface structure of the skin, while the image of infrared light is more likely to show the distribution of blood vessels below the skin epidermis. In addition, the absorption of red light for oxygenated blood is different from that of hypoxic blood, and the absorption for oxygenated blood is smaller than that of hypoxic blood, so it can display venous blood vessels but not arterial blood vessels. On the contrary, the absorption of near-infrared light to oxygenated blood and hypoxic blood is almost the same, so veins and arteries can be displayed at the same time. Therefore, the wavelength combination of the LEDs used in each ring can also be changed according to the application. For example, the ring-shaped light emitting device 100 of the present invention can have ring-shaped light-emitting configurations 110 with different radii at the same time, and the ring-shaped light-emitting configurations 110 with different radii can use different wavelengths. The polarized LED grain is used as the light-emitting element 140, and is controlled by the ring-shaped driving circuit 160 to selectively present the skin surface structure and subcutaneous blood vessel distribution, so as to increase the flexibility in application.

另外，使用本發明之環形發光裝置100時，其光波長組合可以參照物體不同部位的光學性質來調整，這些光學性質例如是折射率、反射率、穿透率或是吸收率(係數)等。如各圈有不同波長時也可根據需求而各圈分別點亮。如圖5，為含氧血HbO2(動脈)與缺氧血Hb(靜脈)對紅光與紅外光 (600-1000 nm)的吸收光譜。如要檢視動脈需用900-1000nm波長的紅外光，因含氧血的莫耳吸光係數大於缺氧血。檢視靜脈需用小於700nm波長的紅光，因缺氧血的莫耳吸光係數大於含氧血。如所有血管都要檢視則使用800nm波長的近紅外光，因含氧血的莫耳吸光係數等於缺氧血。In addition, when using the ring light-emitting device 100 of the present invention, the combination of light wavelengths can be adjusted with reference to the optical properties of different parts of the object, such as refractive index, reflectivity, transmittance or absorption rate (coefficient). If each circle has different wavelengths, each circle can be lighted up separately according to the demand. As shown in Figure 5, it is the absorption spectrum of oxygenated blood HbO2 (artery) and hypoxic blood Hb (vein) to red light and infrared light (600-1000 nm). Infrared light with a wavelength of 900-1000nm is required to inspect arteries, because the molar absorption coefficient of oxygenated blood is greater than that of deoxygenated blood. Red light with a wavelength of less than 700nm is required to inspect veins, because the molar absorption coefficient of oxygenated blood is greater than that of oxygenated blood. If all blood vessels are to be inspected, near-infrared light with a wavelength of 800nm is used, because the molar absorption coefficient of oxygenated blood is equal to that of deoxygenated blood.

綜上所述，本發明提供一種環形發光裝置，其以多個具有偏振特性的發光元件圍繞一中心軸而配置成單一或多個同心圓排列的徑向偏振的環形發光組態，藉此同時提高中心軸上各個位置的照度與光均勻度，使其均勻度與照度較傳統環形LED照明裝置更好。在使用此環形發光裝置照射一置於其中心軸上的物體時，將每個發光元件發出的偏振光其射入該物體的入射角調整至一特定角度，即可抑制該物體表面的反射光生成，且能降低該物體的眩光與陰影。此外，本發明也提供一種應用該環形發光裝置的攝影方法，是將成像裝置與其鏡頭置於環形發光裝置的中心軸上，並且改變環形發光裝置的半徑以便改變具有徑向偏振的環形入射光對被照物體之入射角，例如：布魯斯特角及其附近的一有效入射角範圍，以增加被照物體表面照度、均勻度與照片的解析度，同時可消除眩光及陰影對影像的影響。In summary, the present invention provides a ring-shaped light-emitting device, which uses a plurality of light-emitting elements with polarization characteristics to be arranged around a central axis in a single or multiple radially polarized ring-shaped light-emitting configurations arranged in concentric circles, thereby simultaneously Improve the illuminance and light uniformity of each position on the central axis, so that the uniformity and illuminance are better than the traditional ring LED lighting device. When using this annular light emitting device to illuminate an object placed on its central axis, the incident angle of the polarized light emitted by each light emitting element entering the object is adjusted to a specific angle, which can suppress the reflected light on the surface of the object Generated, and can reduce the glare and shadow of the object. In addition, the present invention also provides a photography method using the ring-shaped light emitting device, which is to place the imaging device and its lens on the central axis of the ring-shaped light-emitting device, and change the radius of the ring-shaped light-emitting device so as to change the pair of ring-shaped incident light with radial polarization. The incident angle of the illuminated object, such as: Brewster's angle and an effective incident angle range near it, to increase the surface illumination, uniformity and photo resolution of the illuminated object, and at the same time eliminate the influence of glare and shadows on the image.

據此，本發明與習知技術具有不同的技術特徵，且本領域中具有通常知識者難以由習知技術輕易的聨想到本發明的概念，故本發明應符合新穎性與進步性。Accordingly, the present invention has different technical features from the prior art, and it is difficult for those skilled in the art to easily conceive the concept of the present invention from the prior art, so the present invention should be novel and progressive.

惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及發明說明內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。另外本發明的任一實施例或申請專利範圍不須達成本發明所揭露之全部目的或優點或特點。此外，摘要部分和標題僅是用來輔助專利文件搜尋之用，並非用來限制本發明之權利範圍。But what is described above is only a preferred embodiment of the present invention, and should not limit the scope of implementation of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention, All still belong to the scope covered by the patent of the present invention. In addition, any embodiment or scope of claims of the present invention does not need to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the present invention.

100:環形發光裝置 110:環形發光組態 120:平面電路基板 122:通孔 122R:半徑 140:發光元件 142:發光二極體封裝結構 144:線偏振片 160:環形驅動電路 180:散熱基板 200:成像裝置 220:鏡頭 300:物體 320:反射光 A1:入射角 A2:特定角度 CA:中心軸 PD:電場偏振方向 PL:偏振光 PL1:部分偏振光束 (入射光束) RD:半徑延伸方向(徑向) 100: ring lighting device 110: Ring light configuration 120: Planar circuit substrate 122: Through hole 122R: Radius 140: Light emitting element 142: Light-emitting diode packaging structure 144: linear polarizer 160: ring drive circuit 180: heat dissipation substrate 200: imaging device 220: lens 300: Object 320: reflected light A1: Angle of incidence A2: specific angle CA: central axis PD: electric field polarization direction PL: polarized light PL1: Partially polarized beam (incident beam) RD: Radius extension direction (radial direction)

圖1為本發明之一實施例的環形發光裝置側面示意圖。Fig. 1 is a schematic side view of a ring light emitting device according to an embodiment of the present invention.

圖1A為圖1中入射光束匯聚處的放大示意圖。FIG. 1A is an enlarged schematic view of the converging place of the incident light beam in FIG. 1 .

圖2為圖1的環形發光裝置正面示意圖。FIG. 2 is a schematic front view of the ring light emitting device in FIG. 1 .

圖3為本發明之一實施例的攝影方法流程示意圖。FIG. 3 is a schematic flowchart of a photography method according to an embodiment of the present invention.

圖4為本發明之一實施例的有效入射角範圍示意圖。FIG. 4 is a schematic diagram of an effective incident angle range according to an embodiment of the present invention.

圖5為本發明之一實施例的環形發光裝置應用於血管可視化的波長選擇示意圖。Fig. 5 is a schematic diagram of the wavelength selection of the application of the annular light-emitting device in blood vessel visualization according to an embodiment of the present invention.

100:環形發光裝置 100: ring lighting device

120:平面電路基板 120: Planar circuit substrate

122:通孔 122: Through hole

122R:半徑 122R: Radius

140:發光元件 140: Light emitting element

142:發光二極體封裝結構 142: Light-emitting diode packaging structure

144:線偏振片 144: linear polarizer

160:環形驅動電路 160: ring drive circuit

180:散熱基板 180: heat dissipation substrate

200:成像裝置 200: imaging device

220:鏡頭 220: lens

300:物體 300: Object

320:反射光 320: reflected light

A1:入射角 A1: Angle of incidence

CA:中心軸 CA: central axis

PD:電場偏振方向 PD: electric field polarization direction

PL:偏振光 PL: polarized light

PL1:部分偏振光束(入射光束) PL1: Partially polarized beam (incident beam)

Claims

一種環形發光裝置，包括：一平面電路基板，具有一通孔，其中該通孔具有一中心軸，並且該通孔的大小適合裝設一具有鏡頭的成像裝置；以及複數發光元件，設置於該平面電路基板上，並環繞該通孔的該中心軸而排列成至少一徑向偏振的環形發光組態，其中該複數發光元件各自包括一偏振片，能產生在可見光或紅外光波長範圍的偏振光，每一該發光元件的該偏振光具有單一電場偏振方向並包括一部分偏振光束其行進方向與該中心軸形成一特定角度，其中每一該發光元件通過該偏振片的配置使其該單一電場偏振方向對準該中心軸並且與該通孔的一半徑延伸方向平行，其中當該複數發光元件各自的該部分偏振光束以該單一電場偏振方向及該特定角度入射一位於該中心軸上的物體時，該物體的表面反射光生成受到抑制。 A ring-shaped light-emitting device, comprising: a planar circuit substrate with a through hole, wherein the through hole has a central axis, and the size of the through hole is suitable for installing an imaging device with a lens; and a plurality of light-emitting elements are arranged on the plane on the circuit substrate, and arranged around the central axis of the through hole to form at least one radially polarized annular light-emitting configuration, wherein each of the plurality of light-emitting elements includes a polarizer, which can generate polarized light in the wavelength range of visible light or infrared light , the polarized light of each of the light-emitting elements has a single electric field polarization direction and includes a part of the polarized light beam whose traveling direction forms a specific angle with the central axis, wherein each of the light-emitting elements makes the single electric field polarization through the configuration of the polarizer The direction is aligned with the central axis and is parallel to a radial extension direction of the through hole, wherein when the partial polarized light beams of the plurality of light-emitting elements are incident on an object located on the central axis with the single electric field polarization direction and the specific angle , the object's surface-reflected light generation is suppressed.

如請求項1所述的環形發光裝置，其中每一該發光元件包括一發光二極體封裝結構及一線偏振片，該線偏振片覆蓋於該發光二極體封裝結構的一光出射面上。 The ring-shaped light-emitting device according to claim 1, wherein each light-emitting element includes a light-emitting diode package structure and a linear polarizer, and the linear polarizer covers a light-emitting surface of the light-emitting diode package structure.

如請求項2所述的環形發光裝置，其中該平面電路基板的表面佈設有至少一環形驅動電路，其中該徑向偏振的環形發光組態中的該複數發光元件佈設於該環形驅動電路的表面。 The ring-shaped light-emitting device according to claim 2, wherein at least one ring-shaped driving circuit is arranged on the surface of the planar circuit substrate, and the plurality of light-emitting elements in the radially polarized ring-shaped light-emitting configuration are arranged on the surface of the ring-shaped driving circuit .

如請求項2所述的環形發光裝置，更包括一散熱基板設置在該平面電路基板上，其中該散熱基板與該複數發光元件分別裝設在該平面電路基板的兩相對表面。 The ring-shaped light-emitting device according to claim 2 further includes a heat dissipation substrate disposed on the planar circuit substrate, wherein the heat dissipation substrate and the plurality of light emitting elements are respectively mounted on two opposite surfaces of the planar circuit substrate.

如請求項2所述的環形發光裝置，其中該至少一徑向偏振的環形發光組態包括以該通孔的該中心軸為環心而形成同心圓排列的複數環形發光組態。 The ring-shaped light emitting device according to claim 2, wherein the at least one radially polarized ring-shaped light-emitting configuration includes a plurality of ring-shaped light-emitting configurations arranged concentrically around the central axis of the through hole.

如請求項1所述的環形發光裝置，其中該複數發光元件提供一光波長組合，該光波長組合與該物體不同部位的光學性質有關。 The ring-shaped light-emitting device as claimed in claim 1, wherein the plurality of light-emitting elements provide a combination of light wavelengths, and the combination of light wavelengths is related to the optical properties of different parts of the object.

如請求項1所述的環形發光裝置，其中該特定角度是選自一包括布魯斯特角的有效入射角範圍。 The ring-shaped lighting device as claimed in claim 1, wherein the specific angle is selected from a range of effective incident angles including Brewster's angle.

一種應用環形發光裝置的攝影方法，包括：將一具有鏡頭的成像裝置裝設於如請求項1至6任一項所述的環形發光裝置的該通孔內，其中該鏡頭具有一光軸，並且使該通孔的該中心軸對準該成像裝置的該鏡頭之該光軸，並且調整該徑向偏振的環形發光組態中的該複數發光元件發出的該部分偏振光束對該物體表面的一入射角，直到該物體的表面反射被減弱。 A photographing method using a ring-shaped light-emitting device, comprising: installing an imaging device with a lens in the through hole of the ring-shaped light-emitting device according to any one of Claims 1 to 6, wherein the lens has an optical axis, And align the central axis of the through hole with the optical axis of the lens of the imaging device, and adjust the partial polarized light beam emitted by the plurality of light-emitting elements in the radially polarized annular light-emitting configuration to the surface of the object. an angle of incidence until the object's surface reflection is attenuated.

如請求項8所述的方法，其中該成像裝置與該鏡頭是裝設於如請求項2至5任一項所述的環形發光裝置，該方法更包括：將每一該發光元件的該線偏振片進行一特定排列，使得該複數發光元件各自的該單一電場偏振方向對準該中心軸並且與該通孔的一半徑延伸方向平行。 The method as described in claim 8, wherein the imaging device and the lens are mounted on the ring-shaped light emitting device as described in any one of claims 2 to 5, the method further includes: connecting the wire of each light emitting element The polarizers are arranged in a specific way so that the single electric field polarization directions of the plurality of light-emitting elements are aligned with the central axis and parallel to a radial extension direction of the through hole.

如請求項8所述的方法，更包括：以布魯斯特角為一參考值，並且選擇性地改變該徑向偏振的環形發光組態的半徑大小或改變該物體在該中心軸上的位置，以調整該部分偏振光束對該物體的該入射角。 The method as described in claim item 8, further comprising: Taking Brewster's angle as a reference value, and selectively changing the radius of the radially polarized annular light-emitting configuration or changing the position of the object on the central axis, so as to adjust the incidence of the partially polarized light beam on the object horn.