TW202206741A - Ring light guide - Google Patents

Abstract

A light source module includes a ring light guide, at least one light source, a reflector, and a diffuser. The ring light guide includes a ring body and at least one light entrance portion. The ring light guide has a light-exit surface and a bottom surface, which are two opposite ring surfaces of the ring body. The ring body has a plurality of optical structures disposed along the ring body. The at least one light entrance portion is disposed on the ring body and protrudes laterally from the ring body. The light entrance portion has a light entrance surface, wherein a plane on which the light entrance surface lies crosses a plane on which the light exit surface lies.

Description

Ring light guide

The present invention generally relates to an annular light guide bar, and in particular, the present invention relates to an annular light guide bar whose light incident direction corresponds to the extending direction of the annular light guide bar.

Due to the appearance of today's products, ring lights are becoming more and more popular for innovation and beauty. In order to achieve the ring light, one of the existing light-emitting mechanisms is to use multiple light-emitting diode (LED) light sources to emit light in the forward direction, or use a flexible light bar to bend into a special shape.

However, when multiple LED light sources are used to emit light in the forward direction, in order to avoid uneven brightness and darkness of the light sources in appearance, multiple LED light sources need to be evenly arranged along the ring, which makes the cost relatively high. The use of flexible light bars in the annular appearance will create a relatively dark area in the connected joint area, which cannot meet the user's demand for product appearance due to today's increasingly refined appearance requirements.

One object of the present invention is to provide a ring-shaped light guide bar, which can achieve cost optimization and light emission uniformity with a limited number of light sources by configuring the light incident surface of the light incident portion to correspond to the extending direction of the ring body portion.

In one embodiment, the present invention provides an annular light guide strip, which includes a ring body portion and at least one light incident portion, wherein the ring body portion has a light exit surface and a bottom surface, and the light exit surface and the bottom surface are two opposite annular surfaces of the ring body portion, The ring body part has a plurality of light guide structures arranged along the ring body part; at least one light entrance part is arranged on the ring body part and protrudes from the side of the ring body part, the light entrance part has a light entrance surface, the plane where the light entrance surface is located and the light exit surface The planes on which it intersects.

In one embodiment, the distribution density of the plurality of light guide structures increases from the light incident surface along the extending direction of the ring body portion.

In one embodiment, the distribution density of the complex light guide structures increases exponentially.

In one embodiment, the light incident portion is an angular portion, and the light incident portion has a top angle, and the top angle is 30 degrees to 45 degrees.

In one embodiment, the normal direction of the light incident surface is substantially parallel to the tangential direction of the ring body portion corresponding to the light incident surface.

In one embodiment, the ring body portion is a circular ring body portion, and at least one light incident portion is symmetrically disposed on the ring body portion with the center of the circular ring body portion.

In one embodiment, on the plane where the light incident surface is located, the size of the light incident surface is larger than the cross-sectional size of the ring body portion.

In one embodiment, the ring body portion includes two straight line segments and two arcuate segments, the two straight line segments are parallel to each other, and the two arcuate segments are connected to the two straight line segments to form a closed ring body portion, at least one light incident portion. It is arranged on at least one of the two straight line segments, and the normal direction of the light incident surface is substantially parallel to the extending direction of the straight line segment.

In one embodiment, at least one light incident portion is correspondingly disposed on the two straight line segments.

In one embodiment, the extending directions of the plurality of light guide structures disposed on the straight segments are arranged in a plurality of rows parallel to the straight segments, and the connecting lines of the corresponding adjacent light guide structures in the adjacent rows and the extending directions of the straight segments have a 60-degree angle. angle.

In one embodiment, the plurality of light guide structures disposed on the arc segment are arranged in a plurality of rows along the extending direction of the arc segment, and the connecting lines of the corresponding adjacent light guide structures in adjacent rows extend along the radial direction of the arc segment. .

Another object of the present invention is to provide a light source module, which can not only maintain a certain degree of uniformity of light emission, but also reduce the maintenance cost of replacing the light source under the circumstance that the number of light sources is reduced by the annular light guide strip.

In one embodiment, the present invention provides a light source module, which includes the above-mentioned annular light guide strip, at least one light source, a reflecting sheet and a diffusing sheet, wherein at least one light source is disposed corresponding to at least one light incident portion, and the light source provides light to automatically The light incident surface enters the annular light guide strip, and the plurality of light guide structures guide the light along the extension direction of the ring body to emit light from the light exit surface; the reflection sheet is arranged on the bottom surface of the ring body to reflect the light toward the light exit surface; the diffuser is arranged on the light exit surface surface to homogenize the light emitted from the light-emitting surface.

In one embodiment, the light source module of the present invention further includes a lens sheet, wherein the lens sheet is disposed on the diffusion sheet to guide the light emitted from the diffusion sheet.

Compared with the prior art, the annular light guide strip and the light source module of the present invention can achieve cost optimization and uniformity of light emission while reducing the number of light sources because the incident light direction corresponds to the extending direction of the annular light guide strip. Furthermore, when the light source module of the present invention needs to be repaired when the life of the light source is exhausted, the number of light sources used is less, which not only saves time for replacement, but also reduces the maintenance cost.

The present invention provides an annular light guide strip and a light source module to provide different lighting patterns and uniform annular lighting. Specifically, the annular light guide bar of the present invention can be applied to a light source module that provides annular lighting, and the light source module can be an independent lighting device or can be integrated into other devices as a light source module that provides annular lighting. The details of the annular light guide strip and the light source module according to the embodiments of the present invention will be described in detail later with reference to the drawings.

FIG. 1 is a schematic diagram of an annular light guide bar according to an embodiment of the present invention. As shown in FIG. 1 , the annular light guide bar 10 includes a ring body portion 110 and at least one light incident portion 120 . The ring portion 110 has a light emitting surface 112 and a bottom surface 114 . The light emitting surface 112 and the bottom surface 114 are two opposite annular surfaces of the ring body 110 , and the ring body 110 has a plurality of light guide structures 116 disposed along the ring body 110 . The light incident portion 120 is disposed on the ring body portion 110 and protrudes from the side of the ring body portion 110 . The light incident portion 120 has a light incident surface 122 , and the plane where the light incident surface 122 is located intersects with the plane where the light exit surface 112 is located.

Specifically, the ring portion 110 can be made of any suitable optical material, such as poly(methyl methacrylate, PMMA), polycarbonate (polycarbonate, PC) and other polymers with suitable optical properties things, but not limited to. The ring body portion 110 is preferably a closed ring body portion, that is, the ring body portion 110 does not have an open free end. The ring portion 110 has a light emitting surface 112 , a bottom surface 114 , an inner side surface 113 and an outer side surface 115 . The light-emitting surface 112 and the bottom surface 114 extend in the same direction and are opposite to each other, so that the normal direction (eg, 112N) of the light-emitting surface 112 and the bottom surface 114 is substantially parallel to the virtual axis CL passing through the center C of the ring. For example, the light emitting surface 112 and the bottom surface 114 are the upper annular surface and the lower annular surface of the ring portion 110 extending along the XY plane and oppositely disposed along the Z-axis direction. The light emitting surface 112 and the bottom surface 114 respectively have opposite inner edges (eg 112I , 114I) and outer edges (eg 112O , 114O) along the radial direction (or the ring diameter direction) of the ring body portion 110, that is, the inner edges of the light emitting surface 112 112I and the inner edge 114I of the bottom surface 114 are located inside the ring body 110 along the radial direction, while the outer edge 112O of the light emitting surface 112 and the outer edge 114O of the bottom surface 114 are located outside the ring body 110 along the radial direction. The inner side surface 113 and the outer side surface 115 are oppositely arranged along the radial direction (or the ring diameter direction) of the ring body portion 110 , so that the inner side surface 113 is connected between the light-emitting surface 112 and the inner edges 112I and 114I of the bottom surface 114 , and the outer side surface 115 is connected between the outer edges 112O and 114O of the light emitting surface 112 and the bottom surface 114 . In one embodiment, the light-emitting surface 112 and the bottom surface 114 have substantially the same shape and size, so that the inner side surface 113 and the outer side surface 115 are connected in a direction substantially parallel to the normal line 112N (or the virtual axis CL) of the light-emitting surface 112 and the bottom surface 114 , respectively. The inner edges 112I, 114I and the outer edges 112O, 114O of the light-emitting surface 112 and the bottom surface 114 are. In other words, the distance between the inner side surface 113 and the outer side surface 115 is substantially the ring width of the ring body portion 110 or the cross-sectional width (eg, 112W) of the light emitting surface 112 .

Furthermore, the ring portion 110 may be a closed ring portion having any suitable shape, such as a circular, oval, rectangular, triangular, polygonal, etc. closed geometric ring portion. For example, as shown in FIG. 1 , the ring body 110 includes two straight segments 117 and two arcuate segments 118 , wherein the two straight segments 117 are parallel to each other and the two arcuate segments 118 connect the two straight segments 117 . To form an elliptical or oblong-like closed ring body.

The light incident portion 120 and the ring body portion 110 are preferably integrally formed, so that the light incident portion 120 protrudes from the side of the ring body portion 110 . In one embodiment, the light incident portion 120 and the ring portion 110 preferably have the same material, but not limited thereto. According to practical applications, the light incident portion 120 and the ring body portion 110 may be made of the same material or different materials. As shown in FIG. 1 , the light incident portion 120 is a protruding portion protruding outward from the outer side surface 115 of the ring body portion 110 , but not limited thereto. In other embodiments, the light incident portion 120 may be a protruding portion protruding inward from the inner side surface 113 of the ring body portion 110 . In other words, according to practical applications, the light incident portion 120 is a portion protruding outward or inward relative to the ring body portion 110 along the radial direction (or the ring diameter direction) of the ring body portion 110 . According to practical applications (eg, the size or shape of the ring body portion 110 ), the annular light guide bar 10 may include one or more (eg, two or more) light incident portions 120 , and the plurality of light incident portions 120 are preferably arranged at intervals in the The ring body portion 110 enables the light entering from the light incident portion 120 to be guided by the ring body portion 110 to be uniformly emitted from the light exit surface 112 . For example, in this embodiment, the annular light guide bar 10 includes two light incident portions 120, and the two light incident portions 120 are preferably disposed correspondingly to the two opposite straight line segments 117, for example, symmetrically disposed at the ring center C, But not limited to this.

The light incident portion 120 is preferably an angled portion, and the light incident portion 120 has an apex angle α, and the apex angle α is 30 degrees to 45 degrees. Specifically, the cross section of the light incident portion 120 parallel to the extension plane (eg, the XY plane) of the light exit surface 112 may have a triangular or triangular-like shape, and one side of the light incident portion 120 (ie, the connecting side 121 ) is connected to the ring The outer side surface 115 of the body portion 110 is such that the corner corresponding to the connection side 121 is the vertex angle α of the light incident portion 120 . For example, as shown in FIG. 1 , the connecting side 121 of the light incident portion 120 is parallel to the extending direction of the straight line segment 117 to connect the straight line segment 117 , so that the two surfaces of the light incident portion 120 (ie, the light incident surface 122 and the inclined surface) 124) The opposite ends of the connecting side 121 extend outward and toward each other and are connected to form an apex angle α, that is, the angle between the light incident surface 122 and the inclined surface 124 is preferably 30 degrees to 45 degrees. Specifically, the light incident surface 122 extends a predetermined distance from one end of the connecting side 121 along the radial direction of the ring body 110 , and the inclined surface 124 is connected to the light incident surface 122 and extends obliquely to connect the other end of the side 121 , so that the incident light is The vertex angle α between the surface 122 and the inclined surface 124 is preferably 30 degrees to 45 degrees. In this embodiment, the light incident portion 120 is disposed on the straight line segment 117 , so that the normal direction 122N of the light incident surface 122 is preferably substantially parallel to the extending direction of the straight line segment 117 . For example, the light incident surface 122 is the surface of the light incident portion 120 extending along, for example, the XZ plane, and the plane (for example, the XZ plane) on which the light incident surface 122 is located is preferably perpendicular to the plane (for example, the XY plane) on which the light exit surface 112 is located, The normal direction 122N (eg, the Y-axis direction) of the light incident surface 122 is substantially parallel to the extending direction (eg, the Y-axis direction) of the straight line segment 117 and perpendicular to the normal direction 112N (eg, the Z-axis direction) of the light exit surface 112 .

Furthermore, on the plane where the light incident surface 122 is located, the size of the light incident surface 122 is larger than the cross-sectional size of the ring body portion 110 . For example, as shown in FIG. 1 , on the XZ plane where the light incident surface 122 is located, the width 122W of the light incident surface 122 along the X-axis direction is preferably larger than the width 112W of the cross-section of the ring body 110 along the X-axis direction, so that The light incident surface 122 has a relatively large area to improve the light incident efficiency, but is not limited thereto. In another embodiment (not shown), on the XZ plane where the light incident surface 122 is located, the thickness of the light incident surface 122 along the Z-axis direction is preferably greater than the thickness of the cross-section of the ring body 110 along the Z-axis direction (ie, the thickness of the light incident surface 122 along the Z-axis direction). The distance between the light surface 122 and the bottom surface 114 ) can also make the light incident surface 122 have a relatively large area to improve the light incident efficiency. In other words, according to the size of the light source and the light emission angle, the light incident surface 122 may preferably have a larger diameter than the light output in one dimension (eg, the X-axis or Z-axis direction) or two dimensions (eg, the X-axis and Z-axis directions) of the extending plane. The size of the surface 112 can improve the light incident efficiency.

The plurality of light guide structures 116 may be disposed along the ring body 110 by techniques such as screen printing, laser engraving, or optical doping. For example, in one embodiment, the plurality of light guide structures 116 may be disposed on the bottom surface 114 or the light exit surface 112 of the ring body 110 by screen printing or laser engraving, but not limited thereto. In another embodiment, the plurality of light guide structures 116 may be doped with optical particles when forming the annular light guide bar 10 , and a light guide structure composed of optical particles is formed in the ring body portion 110 . In one embodiment, the distribution density of the plurality of light guide structures 116 preferably increases from the light incident surface 122 along the extending direction of the ring body portion 110 . Specifically, the distribution density of the plurality of light guide structures 116 preferably increases from the position of the light incident surface 122 toward the light travel direction, so that the distribution density of the plurality of light guide structures 116 disposed close to the light incident surface 122 along the light travel direction is smaller. , and the distribution density far from the light incident surface 122 is larger. For example, taking the dot-shaped light guide structures 116 of the same size as an example, along the light travel direction, the number of light guide structures 116 close to the light incident surface 122 is less, and the light guide structures far away from the light incident surface 122 are less numerous. The number of 116 is more, but not limited to this. According to practical applications, the distribution density of the light guide structures 116 can be determined according to the shape and size of the light guide structures 116 , so that the area occupied by the light guide structures 116 per unit area is relative to the light incident surface 122 along the extending direction of the ring body 110 ( or along the direction of light travel).

Referring to FIG. 2 and FIG. 2A , FIG. 2 is a schematic diagram of a configuration of a light guide structure according to an embodiment of the present invention, and FIG. 2A is a partial enlarged view of FIG. 2 . As shown in FIG. 2 and FIG. 2A , the plurality of light guide structures 116 disposed on the straight line segments 117 are arranged in a plurality of lines parallel to the extending direction 117L of the straight line segments 117 , and the connecting lines ( For example, the virtual connection line 116L) and the extending direction 117L of the straight line segment 117 have an included angle β of 60 degrees. Specifically, the plurality of light guide structures 116 are arranged in a plurality of rows along the radial direction of the straight segment 117 (eg, the X-axis direction), and the plurality of light guide structures 116 in each row are arranged along the extending direction 117L of the straight segment 117 or the light incident surface 122 The normal line direction 122N (for example, the Y-axis direction) is arranged at intervals. The virtual connection lines 116L of the corresponding adjacent light guide structures 116 in the plurality of rows preferably have an included angle β of 60 degrees with the extending direction 117L of the straight line segment 117 or the normal direction 122N of the light incident surface 122 . In each row, the spacing of the plurality of light guide structures 116 is determined according to the light attenuation rate of the light source. For example, taking the dot-shaped light guide structure 116 with a diameter of 0.1 mm as an example, when the material of the ring body 110 is PMMA and the wavelength of the light emitted by the light source is 660 nm, the light attenuation rate is about 106 dB/km , that is, the energy per kilometer is attenuated by about 10^10.6, and the energy per centimeter is attenuated by 10^6.6. In one embodiment, the distribution density of the plurality of light guide structures 116 is preferably increased exponentially to improve the brightness uniformity, but not limited thereto. In other embodiments, the ring body 110 can be divided into a plurality of regions along the extending direction. The closer to the region corresponding to the light incident surface 122, the smaller the distribution density of the light guide structures 116 is, and the farther away from the region corresponding to the light incident surface 122, the light guide is. The distribution density of the structures 116 is greater.

Referring to FIG. 3 , FIG. 3 is a schematic diagram of a configuration of a light guide structure according to another embodiment of the present invention. As shown in FIG. 3 , the plurality of light guide structures 116 disposed on the arcuate segment 118 are arranged in a plurality of rows along the extending direction of the arcuate segment 118 , and the connecting lines of the corresponding adjacent light guide structures 116 in the adjacent rows are along the arc Radial extension of segment 118 . In other words, in the arc-shaped segment 118 , the plurality of light guide structures 116 are arranged in a plurality of rows along the radial direction, and each row is arranged along the extension direction of the arc-shaped segment 118 , so that the corresponding adjacent light guide structures 116 in adjacent rows are arranged in a plurality of rows. The connecting line extends along the radial direction of the arcuate segment 118 .

Although the above-mentioned embodiment takes two light incident portions 120 as an example for description, it is not limited thereto. In another embodiment, as shown in FIG. 4 , the annular light guide bar 10A includes four light incident portions 120 , and the four light incident portions 120 are preferably correspondingly disposed on the two straight segments 117 , so that a plurality of light incident portions 120 are provided. Preferably, light is incident along the extending direction of the ring body portion 110 in sequence. For example, each straight segment 117 is respectively provided with two light incident portions 120 with the same light incident direction, so that the four light incident portions 120 receive light in sequence according to the counterclockwise extending direction of the ring body portion 110, but not to this limit.

As shown in FIG. 5 , in another embodiment, the ring body portion 110B of the annular light guide bar 10B may be a circular ring body portion, and at least one light incident portion 120 is symmetrically disposed at the center CB of the circular ring body portion 110B. Ring body portion 110B. For example, the two light incident portions 120 are symmetrically disposed on the ring portion 110B with the center CB of the circular ring portion 110B, so that the extending planes of the light incident surfaces 122 of the two light incident portions 120 are substantially the same plane, but not This is the limit. In addition, when the light incident portion 120 is disposed on the circular ring body portion 110B or the arcuate segment 118 , the normal direction 122N of the light incident surface 122 is preferably substantially parallel to the tangential direction of the ring body portion 110B corresponding to the light incident surface 122 . As shown in FIG. 5 , the light incident surface 122 of the light incident portion 120 has a tangent line 112T at the junction of the circular ring body portion 110B, and the normal direction 122N of the light incident surface 122 is substantially parallel to the tangent line, that is, the light incident surface 122 It extends substantially in the radial direction of the ring body portion 110B.

As shown in FIG. 6 , in another embodiment, the ring portion 110C of the annular light guide bar 10C may be a polygonal ring portion, such as a triangle, and the normal direction 122N of the light incident surface 122 of the light incident portion 120 is substantially parallel to the corresponding The extension direction of the edge. Specifically, the ring portion 110C may be a polygonal ring portion composed of a plurality of straight line segments 117 , and the light incident portion 120 is disposed on the side of the corresponding straight line segment 117 , so that the normal direction 122N of the light incident surface 122 is substantially parallel to the corresponding straight line segment 117 . The extension direction of the straight segment 117 .

In the embodiments of FIGS. 1 and 4 to 6 , although the closed ring body is described, it is not limited thereto. According to practical applications, the annular light guide bar can also include an open ring body, and the ring body can be an open or closed ring body formed by, for example, a straight segment 117 , an arc segment 118 , or a straight segment 117 and an arc segment 118 . Department. According to practical applications, at least one light incident portion 120 may be disposed on the straight segment 117 , the arcuate segment 118 , or the sides of the straight segment 117 and the arcuate segment 118 , so that when the light incident portion 120 is disposed on the straight segment 117 , the light enters The normal direction 122N of the surface 122 is substantially parallel to the extending direction of the straight segment 117 , and when the light incident portion 120 is disposed on the arcuate segment 118 , the normal direction 122N of the light incident surface 122 is substantially parallel to the ring portion (eg, 110B). Corresponds to the tangent direction of the light incident surface 122 (eg, 112T). Thereby, the light incident direction of the annular light guide bar of the present invention corresponds to the extending direction of the annular light guide bar, which can achieve cost optimization and uniformity of annular light emission while reducing the number of light sources.

Referring to FIGS. 7A to 7C , FIGS. 7A and 7B are respectively an exploded schematic view and a combined schematic view of a light source module according to an embodiment of the present invention, and FIG. 7C is a schematic cross-sectional view of FIG. 7B along the cutting line AA. As shown in FIGS. 7A to 7C , the light source module 1 of the present invention includes an annular light guide strip 10 , at least one light source 20 , a reflection sheet 30 and a diffusion sheet 40 . At least one light source 20 is disposed corresponding to at least one light incident portion 120 of the annular light guide bar 10 . The light source 20 provides light to enter the annular light guide bar 10 from the light incident surface 122 . The plurality of light guide structures 116 guide light along the extending direction of the ring body to exit from the light emitting surface 112 . The reflection sheet 30 is disposed on the bottom surface 114 of the ring body portion to reflect light toward the light emitting surface 112 . The diffusing sheet 40 is disposed on the light emitting surface 112 to homogenize the light emitted from the light emitting surface 112 . In one embodiment, the light source module 1 further includes a lens sheet 50 , and the lens sheet 50 is disposed on the diffusion sheet 40 to guide the light emitted from the diffusion sheet 40 .

In this embodiment, the annular light guide bar 10 of FIG. 1 is used as an example for illustration, but it is not limited thereto. Specifically, the annular light guide bar of the light source module 1 can be any of the annular light guide bars described in the foregoing embodiments (for example, the annular light guide bars 10A, 10B, 10C or variations thereof), which are not shown in the drawings as limit. The light source 20 is preferably implemented as a light emitting diode, and is electrically connected to the light source circuit board 210 . The light-emitting surface of the light source 20 preferably faces the light-incident surface of the light-incident part, and the area of the light-incident surface is preferably larger than that of the light-emitting surface, so that the vertical projection of the light-emitting surface on the light-incident surface is substantially covered within the range of the light-incident surface, so that the The light incident efficiency of the light source 20 is improved.

The reflective sheet 30 can be made of any suitable reflective material (eg, metal), or a non-metallic sheet coated with reflective material. For example, the reflective sheet 30 may be a metal sheet or a non-metal sheet coated with a metal layer, or a reflective coating coated on the bottom surface 114 of the annular light guide bar. The diffusing sheet 40 and the lens sheet 50 may have suitable optical properties to improve the uniformity of light emission of the light source module 1 . In one embodiment, the shapes of the reflection sheet 30 , the diffuser sheet 40 and the lens sheet 50 preferably substantially correspond to the annular body portion of the annular light guide. In other words, the diffusing sheet 40 and the lens sheet 50 preferably have the same shape and size as the light emitting surface 112 of the ring body part, so that the light source module 1 can provide uniform annular lighting. The reflective sheet 30 preferably has the same shape and size as the bottom surface 114 of the ring body, so as to reflect the light emitted toward the bottom surface 114 and exit from the light emitting surface 112 to improve the luminous efficiency.

As shown in FIG. 8 , in another embodiment, the light source module 1 further includes a light blocking member 60 . In this embodiment, the light blocking member 60 is preferably disposed on the inner side of the annular body portion 110 of the annular light guide bar 10 and adjacent to the inner side surface 113 . Thereby, the light emitted from the inner side surface 113 of the ring body portion 110 is blocked from being scattered toward the center C of the ring, so as to enhance the ring-shaped light-emitting shape of the light source module 1 . The light blocking member 60 may be made of a non-light-transmitting material (eg, black polymer) in the form of a block, so as to be inserted into the inner side of the ring portion 110 , but not limited thereto. The light blocking member 60 may also be in the form of a film or a coating, so as to be attached or coated on the inner side surface 113 of the ring body portion 110 . Furthermore, in other embodiments (not shown), the light blocking member 60 is not limited to be disposed on the inner side of the ring body portion 110 , and the light blocking member 60 may be disposed on the outer side of the ring body portion 110 and adjacent to the outer side surface 115 , or at the same time. The inner side and outer side of the ring body portion 110 are adjacent to the inner side surface 113 and the outer side surface 115 respectively, so as to block the light emitted from the inner side surface 113 or the outer side surface 115 of the ring body portion 110 , and further enhance the annular light-emitting shape of the light source module 1 .

In the light source module of the present invention, the light incident surface of the annular light guide plate corresponds to the extending direction of the ring body portion, so that the plane where the light incident surface is located intersects with the plane where the light exit surface is located (or the normal direction of the light incident surface is substantially perpendicular to the light output). The normal direction of the surface), and with the dense configuration of the light guide structure of the ring body, can achieve cost optimization and uniformity of light emission while reducing the number of light sources, and reduce the maintenance cost of light source replacement.

The present invention has been described by the above-mentioned embodiments, however, the above-mentioned embodiments are for illustrative purposes only and not for limitation. Those skilled in the art will appreciate that the embodiments specifically described herein may incorporate other modifications of the illustrated embodiments without departing from the spirit of the invention. Accordingly, the scope of the present invention also encompasses such modifications and is limited only by the scope of the appended claims.

1: Light source module 10, 10A, 10B, 10C: Ring light guide 110, 110B, 110C: Ring body 112: light-emitting surface 112I: inner edge 112O: outer edge 112N: normal direction 112W: width 113: inner side 114: Underside 114I: inner edge 114O: Outer Rim 115: outer side 116: Light guide structure 116L: Virtual connection 117:Line segment 117L: Extension direction 118: Arc Segment 120: Light receiving part 121: Connection side 122: light incident surface 122N: normal direction 122W: width 124: Inclined surface 20: Light source 210: Light source circuit board 30: Reflector 40: Diffuser 50: lens sheet 60: Light blocker C: Ring Center CB: center of circle CL: virtual axis α: vertex angle β: included angle

FIG. 1 is a schematic diagram of an annular light guide bar according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the configuration of a light guide structure according to an embodiment of the present invention. FIG. 2A is a partial enlarged view of FIG. 2 . FIG. 3 is a schematic diagram of the configuration of a light guide structure according to another embodiment of the present invention. 4 to 6 are schematic diagrams of annular light guide bars according to different embodiments of the present invention. 7A and 7B are respectively an exploded schematic view and a combined schematic view of a light source module according to an embodiment of the present invention. FIG. 7C is a schematic cross-sectional view of FIG. 7B along the cutting line AA. FIG. 8 is a schematic diagram of a light source module according to another embodiment of the present invention.

10: Ring light guide strip

110: Ring Body

112: light-emitting surface

112I: inner edge

112O: outer edge

112N: normal direction

112W: width

113: inner side

114: Underside

114I: inner edge

114O: Outer Rim

115: outer side

116: Light guide structure

117:Line segment

118: Arc Segment

120: Light receiving part

121: Connection side

122: light incident surface

122N: normal direction

122W: width

124: Inclined surface

Claims (10)

An annular light guide strip, comprising: a ring body part having a light emitting surface and a bottom surface, the light emitting surface and the bottom surface are two opposite annular surfaces of the ring body part, and the ring body part has a plurality of light guide structures arranged along the ring body part; and At least one light incident portion is disposed on the ring body portion and protrudes from the side of the ring body portion, the light incident portion has a light incident surface, and the plane where the light incident surface is located intersects with the plane where the light exit surface is located. The annular light guide bar according to claim 1, wherein the distribution density of the plurality of light guide structures increases from the light incident surface along the extending direction of the ring body portion. The annular light guide bar of claim 2, wherein the distribution density of the plurality of light guide structures increases exponentially. The annular light guide bar according to claim 1, wherein the light incident portion is an angular portion, and the light incident portion has an apex angle, and the apex angle is 30 degrees to 45 degrees. The annular light guide bar according to claim 1, wherein the normal direction of the light incident surface is substantially parallel to the tangential direction of the ring body portion corresponding to the light incident surface. The annular light guide bar of claim 5, wherein the ring body portion is a circular ring body portion, and the at least one light incident portion is symmetrically disposed on the ring body portion with a center of the circular ring body portion. The annular light guide bar according to claim 1, wherein on the plane where the light incident surface is located, the size of the light incident surface is larger than the cross-sectional size of the ring body portion. The annular light guide bar of claim 1, wherein the ring body portion comprises two straight line segments and two arcuate segments, the two straight line segments are parallel to each other, and the two arcuate segments connect the two straight line segments to A closed ring body portion is formed, the at least one light incident portion is disposed on at least one of the two straight line segments, and the normal direction of the light incident surface is substantially parallel to the extending direction of the straight line segment. The annular light guide bar according to claim 8, wherein the at least one light incident portion is correspondingly disposed on the two straight line segments. The annular light guide bar according to claim 8, wherein the plurality of light guide structures disposed on the straight line segment are arranged in a plurality of rows parallel to the extending direction of the straight line segment, and the adjacent light guide structures corresponding to adjacent rows are arranged in a plurality of rows. The connecting line has an included angle of 60 degrees with the extending direction of the straight line segment.

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