Fill light and electronic device

Abstract

The present application relates to the technical field of optical devices, and discloses a fill light and an electronic device. The fill light comprises a first reflecting member, a second reflecting member, a light exit member, and a light-emitting source; the first reflecting member and the light exit member are positioned on the same side of the second reflecting member; the first reflecting member is provided with a first reflecting surface, the second reflecting member is provided with a second reflecting surface, and the first reflecting surface and the light exit member are both arranged opposite to the second reflecting surface; a polarization modulation member is arranged on the light exit member; light emitted by the light-emitting source is reflected by the first reflecting surface and the second reflecting surface and is then emitted from the light exit member; and external light emitted to the light exit member can be absorbed by the polarization modulation member.

Description

Fill lights and electronic equipment

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on July 28, 2023, with application number 202310944902.X and invention name “Fill light and electronic device”. The entire contents of the application are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the technical field of optical devices, and specifically relates to a fill light and an electronic device. Background Art

[0004] As the imaging capabilities of mobile phones and other electronic devices continue to improve, the demand for taking photos with these devices is growing, and new photo-taking scenarios are emerging. However, in low-light environments and night scenes, it's difficult to capture clear photos, and it's also difficult to provide a good experience when recording or live streaming. Therefore, some electronic devices are equipped with fill lights to provide additional illumination to ensure good imaging in low-light and night scenes.

[0005] In the related art, the fill light adopts a design structure of a Fresnel lens and a reflective bowl, which makes the light output position of the fill light look rather prominent on the housing of the electronic device, thereby making the appearance consistency of the electronic device poor.

[0006] Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide a fill light and an electronic device, which can achieve an effect of consistency between the appearance of the fill light at the light output position and the appearance of the shell of the electronic device.

[0008] In order to solve the above technical problems, this application is implemented as follows:

[0009] In a first aspect, an embodiment of the present application provides a fill light, comprising a first reflector, a second reflector, a light emitting element, and a light source;

[0010] The first reflective member and the light emitting member are located on the same side of the second reflective member; the first reflective member has a first reflective surface, the second reflective member has a second reflective surface, and the first reflective surface and the light emitting member are both arranged opposite to the second reflective surface;

[0011] The polarization modulator is arranged on the light emitting element. The light emitted by the luminous light source is emitted from the light emitting element after being reflected by the first reflecting surface and the second reflecting surface. The external light emitted to the light emitting element can be absorbed by the polarization modulator.

[0012] In a second aspect, an embodiment of the present application provides an electronic device, comprising a housing and the aforementioned fill light;

[0013] The fill light is arranged on the shell, and a mounting hole is provided on the shell. The light emitting element of the fill light and the polarization modulation element are both mounted in the mounting hole.

[0014] In an embodiment of the present application, the light emitted by the luminous light source is reflected by the first reflecting surface and the second reflecting surface to the light emitting member, and is emitted into the external environment through the light emitting member. At the same time, a polarization modulator is provided on the light emitting member, and the polarization modulator can absorb external light. It can also be understood that the polarization modulator shields the external ambient light reflected by the internal components of the fill light, so that the external light cannot be reflected by the fill light. Therefore, when the fill light disclosed in the present application is not performing a light-emitting operation, the polarization modulator can shield the external ambient light reflected by the internal components of the fill light, thereby reducing the contrast of the light emitting position of the fill light, making the light emitting position of the fill light in a dark state, thereby achieving the effect of achieving consistency between the appearance of the light emitting position of the fill light and the appearance of the shell of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic cross-sectional view of a fill light disclosed in an embodiment of the present application;

[0016] Figures 2 and 3 are schematic structural diagrams of a fill light disclosed in an embodiment of the present application;

[0017] FIG4 is a schematic cross-sectional view of another fill light disclosed in an embodiment of the present application;

[0018] 5 and 6 are schematic structural diagrams of another fill light disclosed in an embodiment of the present application;

[0019] FIG7 is a schematic diagram of the light path propagation of the fill light disclosed in the embodiment of the present application.

[0020] Explanation of the accompanying drawings: 100-first reflector, 110-first reflective surface, 200-second reflector, 201-bottom plate, 202-annular side wall, 210-second reflective surface, 300-polarization modulator, 310-linear polarizer, 320-wave plate, 400-luminescent light source, 410-light-emitting element, 500-light guide, 600-optical reflective space, 720-decorative cover, 810-circuit board, 820-fixing plate, 830-housing, 831-mounting hole, 900-light output member, W-center optical axis. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects and are not used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of this application can be implemented in an order other than that illustrated or described herein. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0023] The fill light and electronic device provided in the embodiments of the present application are described in detail below with reference to specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0024] 1 to 7 , the present invention discloses a fill light for use in electronic devices. The fill light includes a first reflector 100 , a second reflector 200 , a light emitting element 900 , and a light source 400 .

[0025] The light source 400 may be a LED (Light Emitting Diode, semiconductor light emitting diode) lamp, a high pressure sodium lamp, a metal halide lamp, etc. Of course, the light source 400 of the fill light may also be other structures, which is not limited herein.

[0026] The first reflector 100 and the light emitting element 900 are located on the same side of the second reflector 200. Specifically, the first reflector 100 has a first reflective surface 110, and the second reflector 200 has a second reflective surface 210. The first reflective surface 110 and the light emitting element 900 are both disposed opposite to the second reflective surface 210. In this case, the first reflective surface 110 and the second reflective surface 210 can reflect light from each other.

[0027] The polarization modulator 300 is disposed on the light emitting element 900. Specifically, the polarization modulator 300 covers one side surface of the light emitting element 900. Light emitted by the light source 400 is reflected by the first reflective surface 110 and the second reflective surface 210, then emitted from the light emitting element 900. External light directed toward the light emitting element 900 is absorbed by the polarization modulator 300. It can also be understood that the polarization modulator 300 blocks ambient light reflected by the internal components of the fill light, preventing external light from being reflected by the fill light.

[0028] During specific operation, as shown in Figures 1 and 4 , light emitted by the light source 400 (light indicated by the dotted line in Figures 1 and 4 ) is reflected by the first reflective surface 110 and the second reflective surface 210 and then emitted from the light emitting element 900 into the external environment. External light (light indicated by the solid line in Figures 1 and 4 ) can pass through the polarization modulator 300 and the light emitting element 900 and enter the fill light. However, due to the polarization effect of the polarization modulator 300, the polarization state of the external light changes. Therefore, the external light reflected by the internal components of the fill light cannot pass through the polarization modulator 300, thereby absorbing the external light and preventing it from being reflected.

[0029] When the fill light disclosed in this application is not emitting light, the polarization modulator 300 can block the reflected light of the external ambient light reflected by the internal components of the fill light, thereby reducing the contrast of the light output position of the fill light, making the light output position of the fill light dark, here referring to the position where the light element 900 is located. As a result, the appearance of the light output position of the fill light and the housing 830 of the electronic device are consistent.

[0030] In addition, in the present application, based on the reflective effect of the first reflective surface 110 and the second reflective surface 210, the light emitted by the light emitting light source 400 is reflected, so that the light emitting light source 400 is not directly opposite to the light emitting component 900, thereby avoiding the exposure of the device of the light emitting light source 400, thereby further improving the consistency between the appearance of the light emitting position of the fill light and the appearance of the shell 830 of the electronic device.

[0031] In the above embodiment, the polarization modulator 300 and the light output element 900 are both light-transmitting components, but the polarization modulator 300 is used to change the polarization state of light, thereby being able to cut off the light whose polarization state has changed, thereby achieving an anti-reflection effect. Therefore, although the polarization modulator 300 can change the polarization state of the light emitted by the light source 400, since its light propagates in one direction, it is sufficient to ensure that the light emitted by the light source can pass through the polarization modulator 300. The external ambient light can also be transmitted in one direction, but the reflected light of the external ambient light cannot be transmitted by the polarization modulator 300. The light output element 900 mentioned above is used for light transmission, so the light output element 900 can be made of any light-transmitting material. For example, materials such as glass and resin.

[0032] In the above embodiment, the light emitting element 900 serves as the installation base of the polarization modulator 300. Of course, the light emitting element 900 and the polarization modulator 300 can also be the same component. When the thickness and strength of the polarization modulator 300 are sufficient, it can achieve the polarization effect and play the role of light output.

[0033] In the above embodiment, the polarization modulator 300 may be a phase delay structure such as a circular polarizer or a linear polarizer. Of course, the polarization modulator 300 may also be other structures, which is not limited herein.

[0034] In a specific solution, the polarization modulation element 300 may include a linear polarizer 310 and a wave plate 320 , and the linear polarizer 310 and the wave plate 320 are stacked.

[0035] The specific principle is shown in Figure 7 , where the light indicated by the solid line is external light. Assuming the transmission axis of the linear polarizer is in the P direction (parallel), the principles of polarization optics indicate that natural light becomes linearly polarized in the P direction after passing through the linear polarizer. Then, after passing through wave plate 320, it experiences a phase delay and becomes right-handed circularly polarized light. After reflecting within the fill light, it changes its propagation direction and becomes left-handed circularly polarized light. Finally, after re-entering wave plate 320, it becomes linearly polarized in the S direction (perpendicular) due to the phase delay. At this point, the reflected light from the external environment cannot pass through the linear polarizer again. The optical path of the fill light during operation is shown by the dashed line in Figure 7 . Light emitted from the luminous source 400 passes through the first reflective surface 110 and the second reflective surface 210 and then reaches the wave plate 320. The wave plate 320 does not change the polarization characteristics. After passing through the linear polarizer from the wave plate 320, it becomes linearly polarized in the P direction and is then emitted outside the fill light, causing it to emit light.

[0036] Alternatively, assuming the transmission axis of the linear polarizer is in the S direction (vertical direction), ambient light passes through the linear polarizer and becomes linearly polarized in the S direction. It then passes through wave plate 320, experiencing a phase delay and becoming left-handed circularly polarized light. It then reflects within the fill light, changing its propagation direction and becoming right-handed circularly polarized light. Finally, upon re-entering wave plate 320, it becomes linearly polarized in the P direction due to the phase delay and cannot pass through the linear polarizer again. When the fill light is operating, light emitted from the luminous source 400 passes through the first reflective surface 110 and the second reflective surface 210 and is emitted toward the wave plate 320. The wave plate 320 does not change its polarization characteristics, and after passing through the linear polarizer from the wave plate 320, it becomes linearly polarized in the S direction and is then emitted outside the fill light, causing it to emit light.

[0037] In this solution, the linear polarizer 310 and the wave plate 320 can better absorb the external ambient light, thereby further improving the integrated black effect of the appearance of the electronic device.

[0038] Furthermore, the optical path difference of the wave plate 320 satisfies the formula: D = |no-ne|d, where no is the refractive index of the o light, ne is the refractive index of the e light, and d is the thickness of the wave plate 320. When linearly polarized light is perpendicularly incident on the wave plate 320, it is decomposed into the o light and the e light, which have different propagation speeds. Since the o light and the e light have different speeds in the wave plate 320, a certain phase difference is generated between the o light and the e light after passing through the wave plate 320. Therefore, the phase delay of the o light and the e light can be obtained based on the optical path difference of the o light and the e light. Therefore, by adjusting the thickness of the wave plate 320, the polarization modulation element 300 with different anti-reflection effects can be obtained, thereby improving the integrated black effect of the housing 830 of the electronic device.

[0039] In another optional embodiment, the optical path difference of wave plate 320 satisfies the formula: |no - ne|d = (m + 0.25)λ, where m is an integer and λ is the wavelength. Based on this formula, wave plate 320 is a quarter-wave plate. When the light vector of incident linearly polarized light forms a 45° angle with the fast or slow axis of wave plate 320, circularly polarized light is obtained after passing through the quarter-wave plate. Alternatively, a quarter-wave plate can convert circularly polarized or elliptically polarized light into linearly polarized light.

[0040] This solution can further improve the anti-reflection performance of the polarization modulation element 300 , and further improve the integrated black effect of the housing 830 of the electronic device.

[0041] Of course, the wave plate 320 disclosed in this application is not limited to the quarter-wave plate 320 described above. It can also be a half-wave plate 320, where the optical path difference of the wave plate 320 satisfies the formula: |no-ne|d=(m+0.5)λ; or the wave plate 320 includes a quarter-wave plate and a half-wave plate stacked together. Of course, the wave plate 320 can also have other structures, which are not limited herein.

[0042] In an optional embodiment, the light emitting element 900 and the polarization modulator 300 can both be annular structures. The light emitting element 900 is disposed around the first reflector 100. Since the polarization modulator 300 is disposed on the light emitting element 900, the polarization modulator 300 is also disposed around the first reflector 100. The first reflective surface 110, the second reflective surface 210, the light emitting element 900, and the polarization modulator 300 can all be rotationally symmetric about the central optical axis W of the light emitting source 400. The central optical axis W of the light emitting source 400 can be understood as the central axis along its light emission direction, or as the central axis of the physical center of the light emitting source 400.

[0043] During specific operation, the light from the light source 400 is reflected by the first reflective surface 110 and the second reflective surface 210 and then emitted from the light emitting element 900 to form a soft, moderately bright, and continuously luminous halo on the light emitting element 900 .

[0044] In the embodiment disclosed herein, the first reflective surface 110, the second reflective surface 210, and the light output element 900 are all rotationally symmetric about the central optical axis W of the light source 400. This results in a uniform illumination distribution of the reflected light around the first and second reflective surfaces 110 and 210, thereby ensuring a more uniform light distribution. Furthermore, light emitted by the light source 400 is reflected between the first and second reflective surfaces 110 and 210, forming a coaxial double-reflection structure. This coaxial double-reflection structure reduces the number of light reflections and directs the light to the light output element 900 to the greatest extent possible, significantly improving the fill light's luminous efficiency. This ensures sufficient energy even with a single light source. This solution utilizes a coaxial double-reflection structure for light guidance, effectively reducing the number of light sources in the fill light. This results in a smaller, more cost-effective, and more efficient heat dissipation system, thereby enhancing the fill light's performance.

[0045] In addition, the reflective structure of the fill light disclosed in this application adopts a coaxial double-reflective rotationally symmetrical structure, so the circumferential luminous intensity of the light output part 900 is the same, so that the fill light has both sufficient luminous energy and good luminous uniformity, so the fill light has good optical performance.

[0046] In another optional embodiment, the light source 400 may include an even number of light-emitting elements 410, and the even number of light-emitting elements 410 may be centrally symmetric about the central optical axis W. When the light source 400 includes a single light-emitting element 410, the central optical axis W is the optical axis of the single light-emitting element 410. When the light source 400 includes an even number of light-emitting elements 410, the central optical axis W of the light source 400 is the central axis of the physical center of the light source 400. In other words, the central axis of the structure surrounded by the even number of light-emitting elements 410 is the central optical axis W herein.

[0047] In this solution, the light source 400 includes an even number of light-emitting elements 410, significantly improving the fill light's luminous efficiency and reducing the amount of light control required by the first reflector 100 and the second reflector 200. The multiple light-emitting elements ensure greater intensity for the light source 400. While maintaining the fill light's luminous efficiency, the polarization modulator 300 and the second reflective surface 210 can be positioned as parallel as possible to ensure the purity of each light's polarization state, further enhancing the concealment of the fill light's light outlet.

[0048] In the above solution, the polarization modulation element 300 and the second reflective surface 210 are kept as parallel as possible, which means that the angle between the plane where the polarization modulation element 300 is located and the second reflective surface 210 is as small as possible, approaching a parallel state.

[0049] In another optional embodiment, the first reflective surface 110 may include a concave area; wherein, the distance between any point on the concave area and the central optical axis W of the light emitting light source 400 may be a first distance, and the distance from the plane where the light emitting light source 400 is located may be a second distance, and the first distance is positively correlated with the second distance.

[0050] The first distance here refers to the perpendicular distance between any point on the concave area and the central optical axis W, while the second distance refers to the perpendicular distance between that point and the plane where the light source 400 is located. The first distance and the second distance are positively correlated. Positive correlation means that when one variable increases, the other variable also increases. The two variables change in the same direction. When one variable changes from large to small or from small to large, the other variable also changes from large to small or from small to large. It can be understood that the arcs formed by the intersection of the plane where the central optical axis W is located and the first reflective surface 110 are two arcs with the openings facing upward, where the upward direction refers to the direction in which the openings are away from the light source 400.

[0051] Since the first reflective surface 110 is rotationally symmetric about the central optical axis W, the concave region is also rotationally symmetric about the central optical axis W. When the concave region is a rotationally symmetric structure, the changing directions of the first distance and the second distance can only be along the extension direction of the central optical axis W.

[0052] In this solution, the first distance and the second distance vary in size along the extension direction of the central optical axis W, so that the concave area is a tapered structure with an edge area larger than the middle area. At this time, the peripheral side of the concave area is inclined to extend outward, and the concave area is a trumpet-shaped structure. The surface of the trumpet-shaped structure can increase the reflection angle of the light reflected to the outer edge, thereby improving the reflection performance of the light, thereby reducing the number of reflections of the light and further improving the optical performance of the fill light.

[0053] Because the second reflective surface 210 needs to ensure the purity of the polarization state of each light, the second reflective surface 210 has a small range of variation and limited control over the light. Therefore, by fully adjusting the surface shape of the first reflective surface 110 to meet the final light distribution requirements on the projection surface, the optical performance of the fill light can be further improved.

[0054] In the above solution, since the concave area is a rotationally symmetrical structure, the first distances of all points on a circle with the same radius in the concave area are the same, and the second distances of all points are also the same.

[0055] In one optional solution, in the direction from the first reflective surface 110 to the second reflective surface 210, such as in the vertically downward direction in Figures 1 and 4 , for example, in the negative direction of the z-axis, the cross-sectional area of ​​the concave region along the direction perpendicular to the central optical axis W gradually decreases, that is, the radius of the concave region gradually decreases. In another optional solution, in the direction from the first reflective surface 110 to the second reflective surface 210, such as in the vertically downward direction in Figures 1 and 4 , for example, in the positive direction of the z-axis, the cross-sectional area of ​​the concave region along the direction perpendicular to the central optical axis W gradually increases, that is, the radius of the concave region gradually increases.

[0056] The light reflection efficiency of the concave area varies depending on the direction of the concave area. As shown in Figure 1, the concave area is convex toward the second reflective surface 210, while as shown in Figure 4, the concave area is concave away from the second reflective surface 210. In this case, the reflection angle of light reflected toward the outer edge is larger, thereby reducing the number of light reflections and further improving the optical performance of the fill light.

[0057] Alternatively, the concave region may be formed by rotating the first curve about the central optical axis W of the light source 400. Here, the first curve is the surface profile of the concave region, and a surface profile here refers to a line segment that forms a specified contour after one rotation about a certain rotational position. The surface contour of the concave region in this application is obtained by rotating the first curve about the central optical axis W. The first curve may be a Bezier curve. In this case, the surface profile of the concave region is a Bezier curve.

[0058] The Bezier curve is a mathematical curve used in two-dimensional graphics applications. It is a smooth curve drawn based on the coordinates of four arbitrary points. The direction and curvature of the curve are adjusted by controlling the four points on the curve (the starting point, the end point, and two separated middle points).

[0059] The first curve is a Bezier curve, which is determined by parameters such as the starting position, starting angle, starting tangent length, end position, end angle, and end tangent length. The specific parameter values ​​of the first curve can be flexibly selected according to actual needs and are not limited in this article.

[0060] In this solution, the concave area is obtained by rotating the Bezier curve around the central optical axis W for one circle. Therefore, the surface shape of the first reflective surface 110 can be further optimized by optimizing the line shape of the Bezier curve, so as to achieve precise light guiding, and thus enable the light to reach the light output element 900 with the least number of reflections, so as to further improve the light energy emitted from the light output element 900, thereby further improving the optical performance of the fill light.

[0061] In a specific solution, as shown in FIG1 , the concave area shown in FIG1 is formed by two continuous Bezier curves, that is, the first curve includes two continuous Bezier curves. The parameters of the first curve are shown in Tables 1 and 2 below:

[0062] Table 1

[0063] Table 2

[0064] The data parameter coordinates in Tables 1 and 2 above can be used to determine a first curve. By rotating the first curve about the central optical axis W, the surface profile of the concave region shown in Figure 1 is obtained. Of course, the parameters of the first curve, such as the starting point, starting point tangent angle, starting point tangent length, end point, end point tangent angle, and end point tangent length, are not limited to the data in Tables 1 and 2. With the starting point and end point coordinates unchanged, the starting point tangent angle, starting point tangent length, end point tangent angle, and end point tangent length data parameters can fluctuate within a range of plus or minus ten percent.

[0065] In a specific solution, as shown in FIG4 , the parameters of the first curve shown in FIG4 are shown in Table 3 below:

[0066] Table 3

[0067] The data parameter coordinates in Table 3 above can be used to determine a first curve. By rotating the first curve about the central optical axis W, the surface profile of the concave region shown in Figure 4 is obtained. Of course, the parameters of the first curve, such as the starting point, starting point tangent angle, starting point tangent length, end point, end point tangent angle, and end point tangent length, are not limited to the data in Table 3. When the starting point and end point coordinates remain unchanged, the starting point tangent angle, starting point tangent length, end point tangent angle, and end point tangent length data parameters can fluctuate within a range of plus or minus 10%.

[0068] In another optional embodiment, at least a portion of the second reflective surface 210 may be formed by rotating a second curve about the central optical axis W of the light source 400; the second curve may be a Bezier curve. The second curve herein represents the surface profile of at least a portion of the second reflective surface 210. In this application, the surface profile of at least a portion of the second reflective surface 210 may be obtained by rotating the second curve once about the central optical axis W.

[0069] In this solution, the second reflective surface 210 is obtained by rotating the Bezier curve around the central optical axis W for one circle. Therefore, the surface shape of the second reflective surface 210 can be further optimized by optimizing the line shape of the Bezier curve, thereby achieving precise light guiding, and allowing the light to reach the light output element 900 with the least number of reflections, thereby further improving the light energy emitted from the light output element 900, thereby further improving the optical performance of the fill light.

[0070] The second curve may be a Bezier curve. In this case, the surface profile of the second reflective surface 210 is a Bezier curve. It is understood that although both the first curve and the second curve are Bezier curves, their parameters are different, such as control endpoints, moving points, curvature changes, and orders.

[0071] The second curve is determined by parameters such as the starting position, starting angle, starting tangent length, end position, end angle, and end tangent length. The specific parameter values ​​of the second curve can be flexibly selected according to the actual working conditions and are not limited in this article.

[0072] In an optional solution, as shown in FIG1 , the parameters of the second curve are shown in Table 4 below:

[0073] Table 4

[0074] The data parameter coordinates in Table 4 can be used to determine a second curve. By rotating the second curve about the central optical axis W, the surface profile of the portion of the second reflective surface 210 shown in FIG1 can be obtained. Of course, the parameters of the second curve, such as the starting point, starting point tangent angle, starting point tangent length, end point, end point tangent angle, and end point tangent length, are not limited to the data in Table 4. When the starting point and end point coordinates remain unchanged, the starting point tangent angle, starting point tangent length, end point tangent angle, and end point tangent length data parameters can fluctuate within a range of plus or minus 10%.

[0075] In another optional embodiment, the middle area of ​​the second reflective surface 210 is configured to be circular, and the surface formed by the second curve can be configured to surround the circular surface.

[0076] Specifically, since the X-axis starting point coordinate of the second curve is 2.8571 mm, the X-axis relative coordinate of the radius of the circular surface is 2.8571 mm, and the radius of the circular surface is 2.8571 mm. At this time, the inner diameter of the surface formed by the second curve is the radius of the circular surface.

[0077] In another embodiment, as shown in FIG4 , the parameters of the second curve are shown in Table 5 below:

[0078] Table 5

[0079] The data parameter coordinates in Table 5 can be used to determine the second curve. By rotating the second curve about the central optical axis W, the surface profile of the portion of the second reflective surface 210 shown in Figure 4 can be obtained. Of course, the parameters of the second curve, such as the starting point, starting point tangent angle, starting point tangent length, end point, end point tangent angle, and end point tangent length, are not limited to the data in Table 5. When the starting point and end point coordinates remain unchanged, the starting point tangent angle, starting point tangent length, end point tangent angle, and end point tangent length data parameters can fluctuate within a range of plus or minus 10%.

[0080] Alternatively, since the X-axis starting point coordinate of the second curve is 2.7375 mm, the X-axis relative coordinate of the radius of the circular surface is 2.7375 mm, and thus the radius of the circular surface is 2.7375 mm. In this case, the inner diameter of the surface formed by the second curve is the radius of the circular surface.

[0081] The first curve and the second curve may be located in the same coordinate system, and the origin of the coordinate system may be the center of the luminous light source 400 .

[0082] In another optional embodiment, along the central optical axis W of the light source 400, the orthographic projections of the first reflective surface 110 and the light output element 900 can both be located within the orthographic projection of the second reflective surface 210. This solution allows more light to be reflected toward the light output element 900, further improving the optical performance of the fill light. Furthermore, because the light output element 900 directly faces the second reflective surface 210, the profile of the second reflective surface 210 can be made flatter while maintaining the fill light's luminous efficiency. Therefore, the polarization modulator 300 can be arranged as parallel to the second reflective surface 210 as possible to ensure the purity of the polarization states of each light.

[0083] In another optional embodiment, as shown in FIG1 , the second reflector 200 may include a bottom plate 201 and an annular sidewall 202. The annular sidewall 202 may be disposed around the bottom plate 201, and the bottom plate 201 may be located at an end of the annular sidewall 202 facing away from the light output member 900. The light output member 900 and the first reflector 100 may both be disposed opposite the bottom plate 201. The second reflective surface 210 may be located on a side of the bottom plate 201 facing the first reflector 100. The first reflector 100, the second reflector 200, and the light output member 900 may enclose an optical reflection space 600.

[0084] In this solution, the first reflector 100, the second reflector 200, and the light emitting element 900 enclose an optical reflective space 600, thereby reducing light loss and improving the optical performance of the fill light. Furthermore, the second reflective surface 210 is disposed on the bottom plate 201 of the second reflector 200. Therefore, the second reflective surface 210 is generally farther away from the polarization modulator 300. Since the position of the polarization modulator 300 is relatively fixed, the farther the second reflective surface 210 is from the polarization modulator 300, the flatter the second reflective surface 210 becomes. Therefore, the second reflective surface 210 and the polarization modulator 300 become closer to parallel, further enhancing the overall black effect of the electronic device housing 830.

[0085] In a specific embodiment, as shown in FIG1 , the thickness of the region of the bottom plate 201 of the second reflector 200 facing the first reflective surface 110 can be 1 mm, and the thickness of the region of the bottom plate 201 facing the polarization modulator 300 can be 1.2 mm. In this case, the thickness of the region of the bottom plate 201 facing the polarization modulator 300 is greater than the thickness of the region facing the first reflective surface 110. Therefore, the light control performance of the region of the bottom plate 201 facing the first reflective surface 110 is better than that of the region facing the polarization modulator 300.

[0086] In another optional solution, as shown in FIG4 , the fill light may further include a light guide 500, and the first reflector 100, the light emitting element 900, and the second reflector 200 may all be disposed on the outer surface of the light guide 500. In this case, the light guide 500 serves as the assembly base for the first reflector 100, the second reflector 200, and the light emitting element 900. It can also be understood that the first reflector 100, the second reflector 200, and the light emitting element 900 are different areas on the light guide 500. The outer surface of the light guide 500 has a light incident area, which may be disposed opposite the light emitting side of the light source 400.

[0087] During the specific fill light process, light from the light source 400 can enter the light guide 500 through the light incident area, be reflected or refracted within the light guide 500, and then be emitted through the light output element 900. Similarly, ambient light can enter the light guide 500 through the light output element 900 and the polarization modulator 300.

[0088] In this solution, the light reflected or refracted between the first reflector 100 and the second reflector 200 is reflected or refracted within the light guide 500. Therefore, the light is reflected or refracted within the same light-guiding medium, and the reflection efficiency of the reflected light of each part is the same, thereby further improving the optical performance of the fill light.

[0089] In addition, the light guide 500 serves as the installation base for the first reflector 100 , the second reflector 200 and the light output member 900 , and also enables the fill light to be assembled separately, without being dependent on other components of the electronic device.

[0090] Optionally, the light guide 500 may be made of translucent glass, resin or other materials. Of course, the light guide 500 may also be made of other materials, which is not limited herein.

[0091] In the solution shown in Figure 1, the transmission medium between the first reflector 100 and the second reflector 200 is air. In the solution shown in Figure 4, the transmission medium between the first reflector 100 and the second reflector 200 is a light guide 500, which is a solid structure. Therefore, the light transmission medium in the solution shown in Figure 1 and the solution shown in Figure 4 is different.

[0092] In another optional embodiment, the fill light may further include a decorative cover 720, the light emitting element 900 may be disposed around the decorative cover 720, and the first reflector 100 may be disposed on a side of the decorative cover 720 facing the second reflector 200. In this solution, the decorative cover 720 can cover the first reflector 100, thereby preventing the first reflector 100 from being exposed, thereby improving the external light performance of the fill light.

[0093] In addition, in the solution shown in FIG. 1 , the decorative cover 720 may also serve as an installation base for the first reflector 100 , and the first reflector 100 may be attached or coated on a surface of the decorative cover 720 facing the second reflector 200 .

[0094] In the above embodiment, when the polarization modulator 300 is located on the outer surface of the light output member 900, the surface of the polarization modulator 300 facing away from the light output member 900 may be flush with the outer surface of the decorative cover 720. Alternatively, when the polarization modulator 300 is located on the inner surface of the light output member 900, the outer surface of the light output member 900 may be flush with the decorative cover 720.

[0095] When the scheme shown in Figures 1 and 4 of this application was subjected to an illuminance distribution experiment on the projection surface at a projection distance of 1000mm. When the illuminance distribution of the projection surface of the scheme shown in Figure 1 was at a projection distance of 1000mm, its covered field of view was rectangular, and the maximum field of view was ±40°. Its illuminance decayed evenly with the increase of the field of view, with the maximum illuminance being 71.1lux and the minimum illuminance being 19.5lux. The illuminance uniformity was greater than 27.4%, and its performance was comparable to that of a traditional flash. The luminous flux of the light source 400 was 600lumen, the luminous flux of the projection surface was 67.5lumen, the energy efficiency was greater than 11.2%, and the light intensity was close to that of a traditional flash.

[0096] The illumination distribution of the projection surface at a projection distance of 1000mm, as shown in Figure 4, covers a rectangular field of view with a maximum field of view of ±40°. Illuminance decreases evenly as the field of view increases, reaching a maximum of 68.9 lux and a minimum of 17.9 lux. Illumination uniformity exceeds 25.98%, comparable to traditional flashlights. The luminous flux of the 400-mm light source is 600 lumens, while the projected surface luminous flux is 54.5 lumens. With an energy efficiency exceeding 14.3%, the light intensity approaches that of traditional flashlights.

[0097] It can be seen that the fill light disclosed in this application has a light intensity comparable to that of a traditional flash, while also being able to conceal its appearance. Furthermore, it has the characteristics of soft light perception, moderate brightness, and sustainable fill light. Compared with the light fill light solutions in the related art, the fill light disclosed in this application can conceal the light output position of the fill light. In addition, by guiding light through a coaxial double-reflection structure, the number of light sources of the fill light can be effectively reduced, thereby making the fill light disclosed in this application smaller in size, lower in cost, and having better heat dissipation performance. Therefore, the fill light disclosed in this application has better performance.

[0098] Based on the fill light disclosed in the embodiments of the present application, the embodiments of the present application further disclose an electronic device, and the disclosed electronic device includes the fill light described in any of the above embodiments.

[0099] The electronic device disclosed in this application further includes a housing 830 , which provides a mounting base for other components of the electronic device. The housing 830 may have a mounting hole 831 , in which both the light emitting element 900 and the polarization modulator 300 may be mounted.

[0100] In the embodiment disclosed in the present application, when the fill light is not in light-emitting operation, the polarization modulator 300 can shield the reflected light of the external ambient light reflected by the internal components of the fill light, thereby reducing the contrast of the light-emitting position of the fill light, making the light-emitting position of the fill light in a dark state, thereby achieving the effect of consistency between the appearance of the light-emitting position of the fill light and the appearance of the shell 830 of the electronic device, thereby achieving the effect of hiding the fill light.

[0101] The electronic device disclosed in this application may further include a circuit board 810, which may be a main board or a sub-board of the electronic device. The light source 400 of the fill light may be disposed on the circuit board 810, and the circuit board 810 may power the light source 400 of the fill light and control the light source 400 to be turned on and off.

[0102] Alternatively, the fill light can be an integrally packaged structure that can be directly mounted on the electronic device's circuit board 810. The mounting hole 831 is aligned with the fill light, allowing light from the fill light to pass through the mounting hole 831 and exit the electronic device's housing 830. In this case, since the fill light is an integrally packaged structure, assembly is much simpler and its application in the electronic device is more convenient.

[0103] Alternatively, as shown in FIG1 , the second reflector 200 can be mounted directly on the circuit board 810, with the circuit board 810 serving as a mounting base for the second reflector 200. In the embodiment shown in FIG4 , the light source 400 is positioned between the light guide 500 and the circuit board 810, with the circuit board 810 serving as a mounting base for the light guide 500. To further stabilize the installation of the light guide 500, supports can be provided at the edges of the light guide 500, positioned between the light guide 500 and the circuit board 810.

[0104] In the solution shown in Figures 1 and 4 , the fill light also includes a decorative cover 720. The light emitting element 900 and the polarization modulator 300 can both be annular structures, and the polarization modulator 300 can be disposed around the decorative cover 720. The first reflector 100 can be disposed on the side of the decorative cover 720 facing the light source 400. The light emitting element 900 and the decorative cover 720 can both be mounted in the mounting hole 831. This solution can further enhance the appearance of the electronic device.

[0105] In another optional embodiment, the fill light may further include a fixing plate 820, which is disposed around the light emitting element 900. The light emitting element 900 may be fixed to the housing 830 of the electronic device through the fixing plate 820. Specifically, the light emitting element 900 may be fixed to the back cover of the electronic device through the fixing plate 820.

[0106] Furthermore, in order to improve the appearance of the fill light, the above-mentioned light source 400, first reflector 100, second reflector 200, mounting hole 831, fixing plate 820, light output element 900 and polarization modulator 300 can all be rotationally symmetrical about the central optical axis W.

[0107] In a specific embodiment, the thickness of the fixing plate 820 can be 0.5 mm. The sum of the thicknesses of the light emitting element 900 and the polarization modulation element 300 can be 0.5 mm. The inner diameters of the polarization modulation element 300 and the light emitting element 900 are both 3.1 mm, and the outer diameters are both 6.375 mm. The radius of the decorative cover 720 can be 3 mm, and its thickness can be 0.25 mm. The size of each light emitting element 410 of the light emitting source 400 can be 1.4 mm*1.4 mm. Of course, the above structure can also have other sizes, which are not limited in this article.

[0108] The electronic devices disclosed in the embodiments of the present application may be smart phones, tablet computers, e-book readers, wearable devices (such as smart watches), electronic game consoles, and other devices. The embodiments of the present application do not limit the specific types of electronic devices.

[0109] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A fill light, comprising a first reflector, a second reflector, a light emitting element and a light source; The first reflective member and the light emitting member are located on the same side of the second reflective member; the first reflective member has a first reflective surface, the second reflective member has a second reflective surface, and the first reflective surface and the light emitting member are both arranged opposite to the second reflective surface; The polarization modulator is arranged on the light emitting element. The light emitted by the luminous light source is emitted from the light emitting element after being reflected by the first reflecting surface and the second reflecting surface. The external light emitted to the light emitting element can be absorbed by the polarization modulator.

2. The fill light according to claim 1, wherein: The polarization modulator includes a linear polarizer and a wave plate, and the linear polarizer and the wave plate are stacked.

3. The fill light according to claim 2, wherein: The optical path difference of the wave plate satisfies the formula: D=|no-ne|d, where no is the refractive index of o light, ne is the refractive index of e light, and d is the thickness of the wave plate.

4. The fill light according to claim 3, wherein: The optical path difference of the wave plate satisfies the formula: |no-ne|d=(m+0.25)λ; wherein m is an integer and λ is the wavelength.

5. The fill light according to claim 1, wherein: The light emitting element and the polarization modulator are both annular structures. The light emitting element is arranged around the first reflecting element. The first reflecting surface, the second reflecting surface, the light emitting element and the polarization modulator are all rotationally symmetrical about the central optical axis of the luminous light source.

6. The fill light according to claim 5, wherein: The light source includes an even number of light emitting elements, and the even number of light emitting elements are centrally symmetrical about the central optical axis.

7. The fill light according to claim 5, wherein: The first reflective surface includes a concave area; The distance between any point on the concave area and the central optical axis of the light source is is a first distance, and a distance from the plane where the light source is located is a second distance, and the first distance is positively correlated with the second distance.

8. The fill light according to claim 7, wherein: The concave area is formed by rotating a first curve with the central optical axis of the light source as the rotation axis; wherein the first curve is a Bezier curve.

9. The fill light according to claim 5, wherein: At least a portion of the second reflective surface is a second curve formed by rotating about the central optical axis of the light source as a rotation axis; wherein the second curve is a Bezier curve.

10. The fill light according to claim 5, wherein: The second reflector includes a bottom plate and an annular side wall, the annular side wall is arranged around the bottom plate, and the bottom plate is located at an end of the annular side wall away from the light output member, the light output member and the first reflector are both arranged opposite to the bottom plate, the second reflective surface is located on the side of the bottom plate facing the first reflector, and the first reflector, the second reflector and the light output member enclose an optical reflection space.

11. The fill light according to claim 1, wherein: The fill light also includes a light guide, and the first reflector, the light emitting element and the second reflector are all arranged on the outer surface of the light guide.

12. The fill light according to claim 1, wherein: The fill light also includes a decorative cover. The light emitting element and the decorative cover are arranged in parallel. The first reflective element is arranged on a side of the decorative cover facing the second reflective element.

13. An electronic device comprising a housing and the fill light according to any one of claims 1 to 12; The fill light is arranged on the shell, and a mounting hole is provided on the shell. The light emitting element of the fill light and the polarization modulation element are both mounted in the mounting hole.

14. The electronic device according to claim 13, wherein: The electronic device further comprises a circuit board, and the light source of the fill light is arranged on the circuit board.

15. The electronic device according to claim 13, wherein: The fill light also includes a decorative cover, the light emitting element and the polarization modulator are both annular structural elements, the polarization modulator is arranged around the decorative cover, and the first reflector is arranged on a side surface of the decorative cover facing the light source; The light emitting member and the decorative cover are both installed in the installation hole.

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