WO2021042973A1

WO2021042973A1 - Ring lamp and electronic device

Info

Publication number: WO2021042973A1
Application number: PCT/CN2020/109530
Authority: WO
Inventors: 于会会; 李云超; 郭志斌
Original assignee: 华为技术有限公司
Priority date: 2019-09-02
Filing date: 2020-08-17
Publication date: 2021-03-11
Also published as: CN110671638A

Abstract

A ring lamp (100) and an electronic device (200) comprising the ring lamp (100). The electronic device (200) may be an electronic product such as a mobile phone, a computer, a loudspeaker box and a fan. All light irradiating a light entering area (211) of the ring lamp (100) can be perpendicular to a cambered surface of the light entering area (211), so that light entering a light guide plate (20) via the light entering area (211) will not be reflected on a light entering section of the light entering area (211). It is ensured that all the light can enter the light guide plate (20), light entering loss is avoided, and thus the light utilization rate of light sources (10) is increased, so that a large light emitting aperture is achieved with fewer light sources (10). Therefore, power consumption and heating amount of the ring lamp (100) are reduced while the ring lamp (100) has the large light emitting aperture.

Description

Ring light and electronic equipment

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on September 2, 2019, the application number is 201910840722.0 and the application name is "Ring Light and Electronic Equipment", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of electronic technology, and in particular to a ring light and an electronic device including the ring light.

Background technique

A ring of ring lights are often added around the buttons of electronic devices or electrical products, such as mobile phones, speakers, etc., to increase their appearance. In the current ring light, in order to obtain a larger light-emitting aperture, generally multiple light sources are arranged around the light-emitting aperture, and the light from the multiple light sources is transmitted to the light-emitting position, thereby obtaining the ring light. However, multiple surrounding light sources consume a lot of power and generate a lot of heat.

Summary of the invention

The present application provides a ring light and electronic equipment, which aim to reduce the power consumption and heat generation of the ring light while the light-emitting aperture of the ring light has a larger size.

In the first aspect, this application provides a ring light. The ring light includes a light source and a light guide plate; the light guide plate includes a first surface and a second surface opposite to the first surface. The first surface is provided with a light incident area, and the second surface is provided with a ring-shaped light exit area. The orthographic projection on the reference plane is located in the area surrounded by the orthographic projection of the ring-shaped light exit area on the reference plane, where the reference plane is a plane perpendicular to the optical axis of the light guide plate; the light emitted by the light source enters the guide through the light entrance area Inside the light plate, light is emitted from the light exit area; the light entrance area includes a concave arc surface, and the light irradiated by the light source to the light entrance area is perpendicular to the arc surface.

The ring lights of some embodiments of the present application enable the light irradiated to the light incident area to be perpendicular to the arc surface of the light incident area, so that the light incident into the light guide plate through the light incident area will not enter the light incident area. There is reflection on the interface, so that all the light can enter the light guide plate, avoiding the loss of incident light, and then improving the light utilization rate of the light source, so that the light energy can be sufficient when the number of light sources is small, so that the light can be in the light guide plate It can transmit a longer distance, that is, a larger light-emitting aperture can be obtained while the number of light sources is small, and the ring light has a large light-emitting aperture while reducing the power consumption and heat generation of the ring light.

In some embodiments, the arc surface of the light incident area is a smooth arc surface. In this embodiment, the light incident area is a smooth arc surface, which can be easily molded.

In some embodiments, the light incident area includes a central area and a plurality of sub-areas arranged sequentially around the outer periphery of the central area. The multiple sub-areas are in a concentric ring shape. Both the central area and the sub-area include sub-curved surfaces and side surfaces, and the side surfaces of the central area are connected. The sub-arc surface of the central area and the sub-arc surface of the sub-area adjacent to the central area, the side surface of the sub-area connects the sub-arc surfaces of two adjacent sub-areas, the sub-arc surface of the central area and the sub-arc surfaces of multiple sub-areas Form the arc of the light incident area. In this embodiment, the light incident area is a Fresnel surface, and each sub-arc surface of the Fresnel surface forms the arc surface of the light incident area of the present application, so as to prevent the light emitted by the light source from being at the light incident interface in the light incident area At the same time as the reflection occurs on the upper surface, the concave degree of the light incident area can be reduced, so that the thickness of the light guide plate can be reduced, and the thickness of the ring light can be reduced, so as to facilitate the application of the ring light in electronic equipment.

In some embodiments, the light source is located on a side of the first surface of the light guide plate facing away from the second surface, and is spaced apart from the light guide plate. By arranging the light source and the light guide plate at intervals, the light spot projected by the light source onto the light guide plate can cover the light incident area of the light guide plate.

In some embodiments, the diameter of the ring-shaped light exit area is 20-50 times the distance from the light source to the light guide plate. In this embodiment, since the ratio of the diameter of the light exit area to the diameter from the light source to the light guide plate is large, the ring light can obtain a larger aperture size with a thinner thickness, and achieve good application effects.

In some embodiments, the light source is arranged opposite to the light entrance area, the center of the light source is located on the central axis of the light entrance area, and the light source includes a light exit surface, and the light exit surface faces the light guide plate. In this embodiment, the center of the light source is located on the central axis of the light incident area, so that the light from the light source irradiated to each position of the light incident area can be more uniform, and thus the light emitted from each position of the light exit area can be more uniform, achieving a good Light effect.

In some embodiments, the surface of the light guide plate is covered with a reflective layer, and the reflective layer is hollowed out in the light incident area and the light exit area. In this embodiment, the surface of the light guide plate except for the light entrance area and the light exit area is covered with a reflective layer, so that when the light in the light guide plate is transmitted to the surface of the light guide plate, all the light can be totally reflected. The light can continue to be transmitted in the light guide plate, so as to prevent the light from leaking from other positions of the light guide plate except the light exit area or being absorbed by the light guide plate, further improving the light utilization rate, and enabling the light to be transmitted for a greater distance in the light guide plate.

In some embodiments, the reflective layer is formed by metal plating or special treatment on the outer surface.

In some embodiments, the side of the reflective layer facing away from the light guide plate is covered with a light shielding layer. In this embodiment, the side of the reflective layer away from the light guide plate is covered with a light-shielding layer, that is, other areas on the surface of the light guide plate except for the light-in and light-exit areas are covered with a light-shielding layer, so as to prevent light from falling from the light guide plate through the light-shielding layer. Leakage from other positions outside the light-emitting area to ensure that the ring light has a better light-emitting effect.

In some embodiments, the surface of the light guide plate is covered with black and white glue. The black and white glue includes a white film layer and a black ink layer. The black ink layer is formed on the white film layer and forms an integral structure with the white film layer; the white film layer is a reflective layer, The black ink layer is a light-shielding layer. In this embodiment, the reflective layer and the light-shielding layer may be an integrated structure, and the reflective layer and the light-shielding layer can be formed on the surface of the light guide plate through a single manufacturing process, which can reduce the manufacturing process and reduce the cost.

In some embodiments, a light diffusing agent is dispersed in the light guide plate. The light diffuser reflects or refracts the light entering the light guide plate, so that the light is evenly dispersed in the light guide plate, and enables the light to travel a longer distance inside the light guide plate, so that the light source can be unchanged, The light emitted by the light source can be transmitted farther in the light guide plate, so that a larger aperture can be obtained with fewer light sources, and the power consumption and heat generation of the ring light can be reduced.

In some embodiments, the ring light further includes a decorative board, the decorative board is arranged in an area surrounded by the light emitting area, and the decorative board is used to enhance the appearance of the ring light.

In some embodiments, the ring-shaped light-emitting area of the second surface is provided with ring-shaped protrusions, the end surface of the ring-shaped protrusions facing away from the light guide plate is the light-emitting surface, the decorative plate is embedded in the annular space enclosed by the ring-shaped protrusions, and the decorative plate faces away from the light guide plate. Coplanar with the light-emitting surface, so that the ring light has a better appearance.

In some embodiments, the ring light further includes a fixing part and a plurality of connecting arms. The fixing part is located on the outer periphery of the light guide plate and spaced from the light guide plate. The connecting arms are connected between the light guide plate and the fixing part, and the connecting arms are elastic. In the embodiment of the present application, the fixing portion is used to fix the light guide plate. Moreover, due to the elasticity of the connecting arm, when the fixing part is fixed, the connecting arm will be elastically deformed when the light guide plate receives a force in the axial direction of the light guide plate (that is, the direction parallel to the central axis), and the force on the light guide plate is cancelled When the time, the light guide plate can be restored to the original position.

In the second aspect, some embodiments of the present application provide electronic equipment. The electronic equipment includes an equipment housing and a ring light. The equipment housing is provided with an opening, the ring light is fixed in the equipment housing, and the light exit area of the light guide plate exposes the equipment housing through the opening. By setting up a ring light on the electronic device, the appearance of the electronic device is enhanced.

Description of the drawings

In order to more clearly illustrate the structural features and effects of the present application, the following will describe it in detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic diagram of the structure of an electronic device according to some embodiments of the application;

Fig. 2 is an exploded view of the ring light of the electronic device shown in Fig. 1 in one direction;

Fig. 3 is an exploded view of the ring light of the electronic device shown in Fig. 1 in another direction;

4 is a cross-sectional view of the ring light of the embodiment shown in FIG. 2 along the II-II direction;

FIG. 5 is an enlarged schematic diagram of the light incident area of the light guide plate according to some other embodiments of the application;

6 is a schematic partial cross-sectional view of the light guide plate of the embodiment shown in FIG. 5 along the II-II direction;

Fig. 7 is a radiation diagram of a light source according to some embodiments of the application;

FIG. 8 is a schematic diagram of the structure of ring lights according to other embodiments of the application;

FIG. 9 is an enlarged schematic diagram of the position II of the ring light in the embodiment shown in FIG. 4;

10 is a schematic cross-sectional view of ring lights according to other embodiments of the application;

11 is a schematic cross-sectional view of ring lights according to other embodiments of the application;

Fig. 12 is a top view of ring lights according to other embodiments of the application;

Fig. 13 is a schematic cross-sectional view of the ring light shown in Fig. 12 along the direction I-I;

Fig. 14 is a schematic partial cross-sectional view along the I-I direction of the electronic device of the embodiment shown in Fig. 1.

detailed description

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

This application provides an electronic device. The electronic device can be a mobile phone, a computer, a speaker, a fan, and other electronic products. There are ring lights on the electronic equipment to increase the appearance of the electronic equipment. For example, a ring light is set on the sound box so that the ring light is lit when the sound box is working, thereby enhancing the appearance of the sound box, and the working state of the sound box can be judged according to the working state of the ring light. Or, setting a ring light at the button position of the mobile phone or the speaker so that the light-emitting circle of the ring light is set around the button, which can improve the appearance of the mobile phone or the speaker, and can also mark the position of the phone button or the speaker button for use in the dark. Please refer to FIG. 1, which is a schematic structural diagram of an electronic device 200 according to this application. In this embodiment, the electronic device 200 is an electronic speaker. The electronic device 200 includes a device housing 110 and a ring light 100. The device housing 110 is provided with an opening 111, and the ring light 100 is fixed in the device housing 110.

Please refer to FIG. 2, which is a schematic structural diagram of the ring light 100 of the electronic device 200 shown in FIG. 1. The ring light 100 includes a light source 10 and a light guide plate 20. The light source 10 is located on one side of the light guide plate 20 and has a certain distance from the light guide plate 20. After the light emitted by the light source 10 enters the light guide plate 20, it is transmitted for a certain distance in the light guide plate 20 and then emitted, thereby obtaining a ring shape aperture. The ring light 100 includes a light guide plate 20, and the light guide plate 20 is provided with a light emitting area 221 for emitting light. Wherein, the light exit area 221 is ring-shaped. When the ring light 100 is fixed in the light guide plate 20, the light exit area 221 of the light guide plate 20 is exposed through the opening 111 to expose the device housing 110. When the ring light 100 emits light, a ring-shaped aperture can be generated, so as to improve the appearance effect of the electronic device 200. Among them, the ring-shaped light exit area 211 can be a circular ring, a square ring, a triangular ring, etc., in various shapes according to actual needs. In this embodiment, the shape of the light exit area 211 of the ring lamp 100 is a circular ring, and a circular light exit aperture can be obtained. In some embodiments, the ring light 100 further includes a circuit board 30, and the light source 10 is fixed on the circuit board 30.

The light guide plate 20 is made of light guide material, so that light can be transmitted in the light guide plate 20. Wherein, the light guide plate 20 can be made of glass, resin, acrylic or other materials. In some embodiments, a light diffusing agent is dispersed in the light guide plate 20, and the light diffusing agent can be inorganic micropowder (such as titanium dioxide) or organic micropowder (such as acrylic or silicone). The light entering the light guide plate 20 is reflected or refracted by the light diffusing agent, so that the light is evenly dispersed in the light guide plate 20, and the light can be transmitted in the light guide plate 20 for a longer distance, so that the light source 10 can remain unchanged. In this case, the light emitted by the light source 10 can be transmitted farther in the light guide plate 20, so that a larger aperture can be obtained with fewer light sources 10, and the power consumption and heat generation of the ring light 100 can be reduced. For example, in some embodiments, the light diffusing agent is organic micropowder, and its material is different from that of the light guide plate 20 and can allow light to pass through. The light transmitted in the light guide plate 20 is refracted when it is transmitted to the organic micropowder, so that the relatively strong light emitted by the light source 10 is evenly dispersed after being refracted, so that the light-emitting surface can be enlarged, and the light at various positions in the light guide plate 20 is more uniform , To avoid the problem of insufficient light intensity when the light is transmitted to the light emitting position. In addition, the refraction of the organic micropowder reduces the transmission of light to the inner wall surface of the light guide plate 20, reduces the light intensity loss caused by multiple reflections of the light on the inner wall surface of the light guide plate 20, and further improves the utilization rate of light. , Extend the transmission distance of light.

Please refer to FIGS. 2 and 3. FIGS. 2 and 3 are schematic diagrams showing the structure of the ring light 100 of the electronic device 200 of the embodiment shown in FIG. 1 in different directions. The light guide plate 20 includes a first surface 21 and a second surface 22 opposite to the first surface 21. The light source 10 is located on the side of the first surface 21 away from the second surface 22. Specifically, referring to FIG. 2, a light incident area 211 is provided on the first surface 21, and light emitted from the light source 10 enters the light guide plate 20 from the light incident area 211. The light incident area 211 is an area enclosed by the periphery 211 a of the light incident area 211. Please refer to FIG. 3, the ring-shaped light exit area 221 is located on the second surface 22. The light exit area 221 includes an inner ring 221a and an outer ring 221b surrounding the inner ring 221a (that is, the side of the inner ring 221a away from the center). The light exit area 221 is an area between the inner ring 221a and the outer ring 221b. The light is emitted from the light emitting area 221, thereby obtaining a ring-shaped aperture. In this embodiment, the shape of the light exit area 221 is a circular ring, and the inner ring 221a and the outer ring 221b are concentric rings, so that the distance from any position of the inner ring 221a to the outer ring 221b is the same, so as to obtain a uniform width at each position Annular aperture, to achieve better decorative effect. It is understandable that, in some embodiments, according to actual decorative effect requirements, the centers of the inner ring 221a and the outer ring 221b may not overlap, and the inner ring 221a and the outer ring 221b may also have different shapes.

Please refer to FIG. 4, which is a schematic cross-sectional view of the ring light 100 in the embodiment shown in FIG. 2 along the II-II direction. In the embodiment of the present application, the orthographic projection of the light incident area 211 on the reference plane is located in an area surrounded by the orthographic projection of the annular light exit area 221 on the reference plane. That is, the orthographic projection of the light incident area 211 on the reference plane is located within the orthographic projection of the inner ring 221a of the light exit area 221 on the reference plane. Wherein, the reference plane is a plane perpendicular to the central axis a of the light guide plate 20. In other words, the distance L2 from the peripheral edge 211a of the light incident area 211 to the central axis a of the light guide plate 20 is smaller than the distance L3 from the inner ring 221a of the light exit area 221 to the central axis a. The light needs to travel a certain distance in the radial direction (the direction perpendicular to the central axis a) of the light guide plate 20 before it can exit the light exit area 221. When the same aperture size is required, the light incident through the light incident area 211 can transmit a certain distance in the radial direction of the light guide plate 20 and then emerge from the light exit area 221, as opposed to direct light from the light source 10 To a position on the first surface 22 opposite to the light-emitting area 221, the light is transmitted to the light-emitting area 221 along the axial direction of the light guide plate 20 (a direction parallel to the central axis a) and the light is emitted. The size of is smaller than the size of the inner ring 221a of the light exit area 221, and the area covered by the light from the light source 10 can be smaller. Therefore, the light source 10 can be closer to the light guide plate 20, so that the thickness of the ring light 100 can be reduced. Specifically, when the light cannot be transmitted in the radial direction of the light guide plate 20 and then emerges from the light exit area 221, if a larger light-emitting aperture is required, the distance between the light source 10 and the light guide plate 20 needs to be farther, so that the light source 10 illuminates The light spot on the light guide plate 20 has a large size and covers the range of the light-emitting aperture, so that the light-emitting aperture can emit light. In the present application, the light incident from the light entrance area 211 is transmitted to the light exit area 221 through the light guide plate 20 for a certain distance along the radial direction of the light guide plate 20, so that the distance between the light source 10 and the light guide plate 20 can be small, so that the When the same aperture size is obtained, the distance between the light source 10 and the light guide plate 20 can be closer, so that the spot size of the light source 10 irradiated on the light guide plate 20 only covers the light incident area 211, thereby reducing the size of the ring light 100 The thickness is convenient for the application of the ring light 100 in electronic equipment. In some embodiments of the present application, the size of the annular light exit area 221 in the radial direction is 20-50 times the distance L1 from the light source 10 to the light guide plate 20. Wherein, the size of the light exit area 221 in the radial direction is twice the distance L3 from the outer ring 221b to the central axis a. In this embodiment, since the light exit area 221 is a circular ring and the outer ring 221b is a circular ring, the size of the light exit area 221 in the radial direction is the diameter of the outer ring 221b. In some embodiments, when the light exit area 221 is a square ring or a triangular ring, the size of the light exit area 221 in the radial direction indicates the diameter of the circumscribed circle of the outer ring 221 b of the light area 221. The distance from the light source 10 to the light guide plate 20 refers to the vertical distance from the center of the light source 10 to a plane perpendicular to the central axis of the light guide plate 20 and passing through the center of the light guide plate 20. In some embodiments, the center axis of the light source 10 coincides with the center axis of the light guide plate 20. At this time, the distance between the center of the light source 10 and the center of the light guide plate 20 is the distance between the center of the light source 10 and the center of the light guide plate 20. distance.

In some embodiments, the shape of the light incident area 211 is the same as the shape of the light output area 221 of the ring lamp 100, and the center of the light incident area 211 is coaxial with the center of the light output area 221. That is, the distance from the edge of the light incident area 211 to each position of the light output area 221 is the same. When the light from the light source 10 uniformly enters all directions in the light guide plate 20, it is transmitted through the light guide plate 20 to the light exit area 221 of the ring lamp 100. The light intensity of each position is the same, so that each position of the ring light 100 can emit light uniformly. For example, when the shape of the light-emitting area 221 of the ring light 100 is circular, the shape of the light-incident area 211 is also circular; when the shape of the light-emitting area 221 of the ring light 100 is square, the shape of the light-incident area 211 is also Square. The shape of the light incident area 211 refers to the edge profile shape of the light incident area 211, and the shape of the light exit area 221 of the ring light 100 refers to the shape enclosed by the aperture. In this embodiment, the center of the light incident area 211 and the center of the light exit area 221 are both located on the central axis a of the light guide plate 20.

The light incident area 211 includes an arc surface recessed from the first surface 21 to the second surface 22, and the light irradiated by the light source 10 to the light incident area 211 is perpendicular to the arc surface. Specifically, by simulating the light path of the light source 10, confirming the direction of the exit light path of the light source 10, and then profiling the exit light path of the light source 10 to obtain the required arc shape, so that the light incident to each position of the light incident area 211 Both can be perpendicular to the arc surface of the light incident area 211. By making the light irradiated by the light source 10 to the light incident area 211 to be perpendicular to the arc surface, the light irradiated to the light incident area 211 can be prevented from being reflected on the incident interface of the light incident area 211, so that all the light irradiated to the light incident area 211 can be The light enters the light guide plate 20, so that under the condition that the specification and quantity of the light source 10 remain unchanged, the amount of light entering the light guide plate 20 is increased, and the light utilization rate of the light source 10 is improved, so that the light can be in the light guide plate 20. Transmit a longer distance to get a larger aperture.

In some embodiments, the arc surface of the light incident area 211 is a smooth arc surface. Wherein, the arc surface shape of the light incident area 211 obtained according to the profiling can be any type of smooth arc surface. For example, the arc surface can be a hemispherical surface, a spline surface, or the like.

Please refer to FIG. 5 and FIG. 6. FIG. 5 shows an enlarged schematic view of the light incident area 211 of the light guide plate 20 of some other embodiments of the application; FIG. 6 shows the light guide plate 20 of the embodiment shown in FIG. 5 along II-II. Schematic diagram of a partial cross-section of the direction. The light incident area 211 of the light guide plate 20 of the embodiment shown in FIG. 5 is a Fresnel surface. Specifically, the light incident area 211 includes a plurality of sub-areas 222 located in the central area 223 and sequentially arranged around the outer periphery of the central area 223. The multiple sub-regions 222 are in a concentric ring shape, that is, the center of each sub-region overlaps. The central area 223 includes a sub-arc surface 223a and a side surface 223b. Each sub-area 222 includes a sub-arc surface 222a and a side surface 222b, and the side surface 222b of each sub-area 222 connects the sub-arc surfaces 222a of two adjacent sub-areas 222. The side surface 223b of the central area 223 connects the sub-arc surface 223a and the sub-arc surface 222a of the sub-area 222 adjacent to the central area 223. The curvature direction of the sub-arc surface 222 a of each sub-region 222 faces the side of the first surface 21 away from the second surface 22. The side surface 222 b of each sub-region 222 is parallel to the central axis a of the light guide plate 20. The sub-arc surface 223a of the central area 223 and the sub-arc surfaces 222a of the multiple sub-areas 222 form the arc surface of the light incident area 211, so that any light incident to the light incident area 211 can be incident perpendicular to the sub-arc surface 223a or the sub-arc surface 222a , So that all the light incident to the light incident area 211 can enter the light guide plate 20, and the light utilization rate of the light source 10 is improved, so as to increase the transmission distance of the light in the light guide plate 20. In addition, by setting the light incident area 211 of the light guide plate 20 as a Fresnel surface, the degree of recession of the light incident area 211 can be reduced, so that the thickness of the light guide plate 20 can be reduced, thereby reducing the thickness of the ring light 100. In order to facilitate the application of the ring light 100 in electronic equipment.

Please refer to FIG. 4 again, the light source 10 is arranged opposite to the light incident area 211, that is, the orthographic projection of the light incident area 211 on the reference plane covers the orthographic projection of the light source 10 on the reference plane. In addition, the light exit surface of the light source 10 faces the light guide plate 20, so that the light emitted by the light source 10 can enter the light guide plate 20 from the light incident area 211 as much as possible. In some embodiments of the present application, the light source 10 corresponds to the center position of the light incident area 211, that is, the center of the light source 10 is located on the central axis a of the light incident area 211, so that the light from the light source 10 can evenly enter the light incident area 211 various locations. Further, in some embodiments, the type of the light source 10 matches the shape of the light incident area 211. In other words, the shape of the light spot irradiated by the light source 10 on the first surface 21 needs to be the same as the shape of the light incident area 211. Therefore, the light from each light source 10 of the light source 10 can be more uniformly incident into each position of the light incident area 211. Since the light incident to each position of the light incident area 211 is uniform, the light emitted from each position of the light output area 221 is uniform, so that the ring light 100 has a better appearance effect. For example, when the shape of the light spot irradiated to the first surface 21 of the light source 10 is circular, the shape of the light incident area 211 is a circle; when the shape of the light spot irradiated to the first surface 21 of the light source 10 is square, the shape of the light spot irradiated to the first surface 21 is square. The shape of the light area 211 is square.

In some embodiments, the size of the light incident area 211 is matched with the effective emission angle of the light source 10, so that the light within the effective emission angle of the light source 10 can be incident on the light incident area 211 when irradiated on the first surface 21, so that Most of the light energy of the light source 10 can enter the light guide plate 20 to ensure a high light utilization rate of the light source 10 while reducing the size of the light incident area 211 as much as possible. Since the size of the light incident area 211 is reduced, and the degree of curvature of each position of the light incident area 211 remains unchanged, it is ensured that the light incident to each position of the light incident area 211 can be perpendicular to the light incident area 211, which can reduce The concave degree of the light incident area 211 reduces the thickness of the light guide plate 20. Specifically, the size of the light incident area 211 needs to be equal to or slightly larger than the effective light-emitting area of the light source 10, that is, the size of the light incident area 211 needs to be equal to or slightly larger than the effective emission angle of the light source 10 on the first surface 21. The size of the irradiated area enables all the light emitted within the effective emission angle of the light source 10 to enter the light guide 20 through the light incident area 211. Specifically, when the center of the light source 10 is located on the central axis a of the light incident area 211, the distance between the center of the light source 10 and the periphery 211a of the light incident area 211 is L ₁ , and the effective emission angle of the light source 10 is α, _{The distance L 2} from the edge of the light incident area 211 to its central axis a is equal to or slightly greater than L ₁ tanα, so that all the light within the effective emission angle α of the light source 10 can be incident on the light incident area 211 to enhance the light source 10 Light utilization. The distance from the light source 10 to the light incident area 211 refers to the distance from the light source 10 to the plane of the edge of the light incident area 211. The radius of the light incident area 211 refers to the radius of the area enclosed by the edge of the light incident area 211. _{The distance L 1} between the edge of the light source 10 and the plane of the periphery of the light incident area 211 is determined according to the actual size of the assembly space of the ring light 100.

For example, FIG. 7 shows a radiation pattern of a light source 10 of this application, showing the relative radiation density of the light source 10 under different emission angles. In the figure, the concentric circles with the center point O as the center indicate the relative radiation density. For example, 0.1 to 1.0 in the figure respectively indicate that the relative radiation density is 10% to 100%. The radial lines perpendicular to the concentric circles in the figure indicate different emission angles of the light source 10. Among them, 0°～90° respectively indicate that the angle between the emission angle and the central axis a is ±0°～±90°. It can be seen from the figure that when the emission angle is within 70°, the relative radiation density of the light source 10 is more than 30%, that is, the effective emission angle of the light source 10 in the embodiment shown in FIG. 6 is ± of the central axis a of the light source 10 Within 70°. When the distance from the center of the light source 10 to the plane of the edge of _{the light incident area 211 is L 1} , the distance from the edge of the light incident area 211 to the central axis a is equal to or slightly greater than L ₁ tan 70°, so that the light source 10 is at an effective emission angle The internally emitted light can all enter the light incident area 211, which enhances the utilization rate of the light source 10. In addition, the problem of excessively large thickness of the light guide plate 20 caused by the excessively large light incident area 211 can be avoided, thereby reducing the thickness of the ring light 100.

In this application, the number of light sources 10 may be one or more. For example, when the required aperture is small or the brightness of the aperture can be low, a single light source 10 can be used; when the required aperture is large or the brightness of the aperture is required to be high, multiple light sources 10 can be used. In the embodiment shown in FIG. 2, there is one light source 10 of the ring light 100, and the center of the light source 10 is located on the central axis a of the light incident area 211, so that the light intensity of the light source 10 irradiated to each position of the light incident area 211 is the same , So that when light is finally emitted from the light exit area 221 after being transmitted by the light guide plate 20, the light at each position of the light exit area 221 is uniform, so as to achieve a good light extraction effect. Please refer to FIG. 8, which is a schematic structural diagram of a ring light 100 according to another embodiment of the application. In the embodiment shown in FIG. 8, there are multiple light sources 10, and the multiple light sources 10 are concentratedly arranged at positions opposite to the light incident area 211, and the multiple light sources 10 are taken as a whole, so that the incident light can be obtained through simple profiling. The arcuate shape of the area 211. In addition, the entire center of the plurality of light sources 10 is located on the central axis a of the light incident area 211, so that all the light irradiated by the plurality of light sources 10 to the light incident area 211 can be transmitted to the light guide plate 20. Compared with the multiple light sources 10 in the prior art, the utilization rate of the light source 10 of each light source 10 in the present application is improved, so that the number of light sources 10 can be reduced when the same light-emitting effect is achieved, thereby saving energy and reducing fever.

Please refer to FIG. 9. In some embodiments of the present application, the surface of the light guide plate 20 is covered with a reflective layer 40, and the reflective layer 40 is hollowed out in areas corresponding to the light incident area 211 and the light exit area 221. In other words, the other areas of the light guide plate 20 except the light entrance area 211 and the light exit area 221 are covered with the reflective layer 40, so that the light in the light guide plate 20 can be totally reflected when transmitted to the surface of the light guide plate 20. , The light after total reflection can continue to be transmitted in the light guide plate 20, so as to prevent the light from leaking from other positions of the light guide plate 20 except the light exit area 221 or being absorbed by the light guide plate 20, further improving the light utilization rate, and making the light on the light guide plate A greater distance can be transmitted within 20. In some embodiments, the reflective layer 40 may be obtained by performing surface treatment on other areas of the light guide plate 20 except for the light entrance area 211 and the light exit area 221. For example, by polishing the surface of the light guide plate 20 except for the light entrance area 211 and the light exit area 221, the surface of the light guide plate 20 after grinding can totally reflect the light transmitted to the light guide plate 20. , That is, the reflective layer 40 is formed on the surface of the light guide plate 20 after surface treatment. Alternatively, in some embodiments, the outer surface of the light guide plate 20 is plated with a metal plating layer having a good reflection effect, such as a silver plating layer, an aluminum plating layer, etc., by a process such as sputtering and evaporation. Alternatively, in some embodiments, a reflective film may be directly attached to the outer surface of the light guide plate 20 to form the reflective layer 40. Among them, the reflective film may be a film layer such as a metal film layer, a white glue layer, and the like. It is understandable that only examples of the reflective layer 40 of some embodiments of the present application are given here, and the type of the reflective layer 40 of the present application is not limited.

In some embodiments of the present application, a light-shielding layer 50 is laminated on the side of the reflective layer 40 facing away from the light guide plate 20, so as to prevent light from leaking from other positions outside the light-emitting area 211 of the light guide plate 20 through the light-shielding layer 50, so as to ensure that the ring light 100 has more Good lighting effect. The light-shielding layer 50 can be a light-shielding material such as a black ink layer, which is formed on the side of the reflective layer 40 that faces away from the light guide plate 20 through a coating process; or, the light-shielding layer 50 can also be a black film, etc., which is formed on the reflective layer 40 by pasting. The side facing away from the light guide plate 20.

In some embodiments, the reflective layer 40 and the light-shielding layer 50 may be an integral structure, and the reflective layer 40 and the light-shielding layer 50 can be formed on the surface of the light guide plate 20 through one manufacturing process, which can reduce the manufacturing process and reduce the cost. For example, in an embodiment of the present application, the integral structure of the reflective layer 40 and the light shielding layer 50 is black and white glue. One side of the black and white glue is white, and the other side is black. The white side is attached to the outer surface of the light guide plate 20 to realize the reflection of the light transmitted from the light guide plate 20 to the surface of the light guide plate 20. The black side of the black-and-white glue faces away from the light guide plate 20, which can prevent light from leaking from the light guide plate 20 during the transmission of light in the duct plate. In some embodiments, the black and white glue includes a white film layer and a black ink layer laminated on the white film layer. Among them, the side of the white film layer facing away from the ink layer is the white side of the black and white glue, and the side of the black film layer facing away from the white film layer is the black side of the black and white glue. In this embodiment, the white film layer is the reflective layer 40, and the black ink layer is the light-shielding layer 50.

Please refer to FIG. 10, in some embodiments of the present application, the ring light 100 further includes a decorative plate 60, and the decorative plate 60 is disposed in an area surrounded by the inner ring of the light exit area 221. The decorative board 60 is used to enhance the appearance of the ring light 100. In addition, the decoration board 60 is arranged in the area surrounded by the light-emitting area 221, which can enhance the light-shielding effect of the area surrounded by the ring-shaped light-emitting area 221, avoid light leakage, and present a better light-emitting effect.

In some embodiments, the light exit area 221 of the second surface 22 is provided with an annular protrusion 25, and the annular protrusion 25 protrudes from the second surface 22. The annular protrusion 25 is formed of the same material as the light guide plate 20 and is integrally formed with the light guide plate 20. The annular protrusion 25 includes a light emitting surface 251 and an inner wall surface 252 and an outer wall surface 253 disposed oppositely. The light emitting surface 251 is located between the inner wall surface 252 and the outer wall surface 253 and connects the inner wall surface 252 and the outer wall surface 253. The side far from the light-emitting area 221 is the light-emitting surface 251. The light transmitted in the light guide plate 20 enters the annular protrusion 25 through the light-emitting area 221, and finally emits light from the light-emitting surface 251 of the annular protrusion 25 after being transmitted in the annular protrusion 25. Get an annular aperture. In some embodiments, the surface of the annular protrusion 25 except for the light-emitting surface 251 is covered with a reflective layer 40 and a light-shielding layer 50 to prevent other positions of the annular protrusion 25 except the light-emitting surface from impairing transmission in the annular protrusion 25. The light absorption and light leakage make the light transmitted in the annular protrusion 25 as much as possible to emerge from the light-emitting surface 251 of the annular protrusion 25, thereby having a better light-emitting effect.

In some embodiments, the decorative plate 60 is embedded in the area enclosed by the annular protrusion 25 so that the decorative plate 60 is more stably fixed on the light guide plate 20. The decorative plate 60 includes a bottom surface 61 attached to the light guide plate 20, a top surface 62 opposite to the bottom surface 61, and a side surface 63 connected between the bottom surface 61 and the top surface 62. The decorative plate 60 is embedded in the annular protrusion 25. When in the enclosed area, the side surface 63 of the decorative board 60 is attached to the inner wall surface 252 of the annular protrusion 25. In addition, the side of the decorative plate 60 facing away from the light guide plate 20 is coplanar with the light-emitting surface 251 of the annular protrusion 25, so that the ring light 100 has a better appearance effect.

Please refer to FIG. 11. FIG. 11 is a schematic cross-sectional view of the ring light 100 according to some other embodiments of the application. In some embodiments, the ring light 100 further includes a fixing portion 41 connected to the light guide plate 20 to fix the light guide plate 20 to other structures. The light guide plate 20 includes a peripheral surface 23 connected between the first surface 21 and the second surface 22. In the embodiment shown in FIG. 11, the fixing portion 41 is a protruding structure protruding from the peripheral surface 23. Please refer to FIGS. 12 and 13. FIG. 12 is a top view of the ring light 100 according to some other embodiments of the application; FIG. 13 is a schematic cross-sectional view of the ring light 100 of the embodiment shown in FIG. 12 along the direction I-I. In the embodiment shown in FIG. 12, the ring light 100 further includes a plurality of connecting arms 42. The fixing portion 41 is located on the outer periphery of the light guide plate 20 and is spaced from the light guide plate 20. The plurality of connecting arms 42 are connected to the light guide plate 20 and the fixing portion 41. between. In some embodiments, the connecting arm 42 has elasticity, so that when the fixing portion 41 is fixed, the connecting arm 42 will be elastically deformed when the light guide plate 20 receives a force in the axial direction of the light guide plate 20 (that is, the direction parallel to the central axis a). When the force on the light guide plate 20 is removed, the light guide plate 20 can be restored to the original position. In some embodiments, a button 70 may be provided on the side of the light guide plate 20 facing the light source 10. In some embodiments, the button 70 is provided on the circuit board 30. The first surface 21 of the light guide plate 20 is provided with a pressing portion 212 protruding from the first surface 21, and the pressing portion 212 is disposed opposite to the button 70. When the light guide plate 20 is pressed in the axial direction, the light guide plate 20 moves toward the circuit board 30, and the pressing portion 212 contacts the button 70 and presses the button 70. The button 70 can be any button switch, for example, it can be a power button, a volume adjustment button, and so on.

In this application, the light incident area 211 is provided so that the light irradiated to the light incident area 211 can be perpendicular to the arc surface of the light incident area 211, so as to prevent the light incident into the light guide plate 20 through the light incident area 211 from entering the light guide plate 20. There is reflection on the light incident surface of the light zone 211 to avoid incident light loss, thereby improving the light utilization rate of the light source 10, so that the light energy can be sufficient when the number of light sources 10 is small, and the light can be transmitted farther in the light guide plate 20 the distance. In other words, it is possible to obtain a larger light-emitting aperture while the number of light sources 10 is small, and to achieve a large light-emitting aperture of the ring light 100 while reducing the power consumption and heat generation of the ring light 100.

Please refer to FIG. 14, which is a schematic partial cross-sectional view of the electronic device 200 of the embodiment shown in FIG. 1 along the I-I direction. In this embodiment, the ring light 100 is fixed to the device housing 110 of the electronic device 200 and the light exit area 221 of the light guide plate 20 just exposes the device housing 110 through the opening 111 on the device housing 110. Specifically, in this embodiment, the ring light 100 is the ring light 100 of the embodiment shown in FIG. 11. The fixing portion 41 of the light guide plate 20 is fixed to the inner surface of the equipment housing 110 so that the light guide plate 20 and the equipment housing 110 are fixedly connected. In this embodiment, there are four buttons 70, and the four buttons 70 are all provided on the circuit board 30. The four buttons 70 are respectively a volume up button, a volume down button, a call button and a microphone button. Four pressing parts 212 are provided on the first surface 21 of the light guide plate 20, and the four pressing parts 213 correspond to the four buttons 70 one-to-one. When the volume needs to be increased, the volume is reduced, the call or the microphone is used, the light guide plate is pressed axially The corresponding position of 20 and button 70 can realize the required function. It can be understood that the number and functions of the buttons 70 in the present application are only used for illustration, and are not limited here.

The above are some implementations of the application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the application, several improvements and modifications can be made, and these improvements and modifications are also regarded as the original The scope of protection applied for.

Claims

A ring light, characterized in that it comprises a light source and a light guide plate;

The light guide plate includes a first surface and a second surface opposite to the first surface. The first surface is provided with a light incident area, and the second surface is provided with an annular light exit area. The orthographic projection of the area on the reference plane is located in the area surrounded by the orthographic projection of the ring-shaped light exit area on the reference plane, wherein the reference plane is a plane perpendicular to the optical axis of the light guide plate; The light emitted by the light source enters the light guide plate through the light entrance area, and emits light from the light exit area;

The light incident area includes a concave arc surface, and the light irradiated by the light source to the light incident area is perpendicular to the arc surface.
The ring light of claim 1, wherein the light incident area comprises a central area and a plurality of sub-areas arranged around the outer circumference of the central area in turn, the plurality of sub-areas are in a concentric ring shape, and the center Both the area and the sub-area include a sub-arc surface and a side surface, and the side surface of the central area connects the sub-arc surface of the central area and the sub-arc surface of the sub-area adjacent to the central area. The side surfaces of the area connect the sub-arc surfaces of two adjacent sub-areas, and the sub-arc surfaces of the central area and the sub-arc surfaces of a plurality of the sub-areas form the arc surfaces of the light incident area.
The ring light of claim 1, wherein the arc surface of the light incident area is a smooth arc surface.
The ring light of claim 1, wherein the light source is located on a side of the first surface of the light guide plate away from the second surface, and is spaced apart from the light guide plate.
5. The ring light of claim 4, wherein the diameter of the light exit area of the ring is 20-50 times the distance from the light source to the light guide plate.
The ring light of claim 4, wherein the light source is arranged opposite to the light incident area, the center of the light source is located on the central axis of the light incident area, and the light source includes a light emitting surface, so The light emitting surface faces the light guide plate.
5. The ring light of claim 1, wherein the surface of the light guide plate is covered with a reflective layer, and the reflective layer is located in the light incident area and the light exit area.
8. The ring light of claim 7, wherein the side of the reflective layer facing away from the light guide plate is covered with a light shielding layer.
The ring light of claim 8, wherein the surface of the light guide plate is covered with black and white glue, the black and white glue includes a white film layer and a black ink layer, and the black ink layer is formed on the white film layer And forming an integral structure with the white film layer; the white film layer is the light-reflecting layer, and the black ink layer is the light-shielding layer.
The ring light of claim 1, wherein a light diffusing agent is dispersed in the light guide plate.
The ring light according to claim 1, wherein the ring light further comprises a fixing part and a plurality of connecting arms, the fixing part is located on the outer periphery of the light guide plate and is spaced apart from the light guide plate, and the The connecting arm is connected between the light guide plate and the fixing part, and the connecting arm has elasticity.
An electronic device, comprising a device housing and the ring light of any one of claims 1-11, the device housing is provided with an opening, the ring light is fixed in the device housing, and The light exit area of the light guide plate exposes the device housing through the opening.