Light emitting device
By using a liquid lens in the light emitting device to change the diopter, the problem of scattering the light rays of the flash light is solved, the beam is expanded and uniform illuminated, and the fill light effect is improved.
Patent Information
- Application Number
- CN202510030704.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-09-26
- Filing Date
- 2025-01-08
- Publication Date
- 2025-08-01
AI Technical Summary
The light emitted by the flash is often scattered into the environment, resulting in poor complement light efficiency.
A light emitting device including a light source, a collimator lens and a liquid lens is used to control the divergence angle of the light beam by changing the diopter of the liquid lens to concentrate the light on the photographed object.
The lighting range of the light beam is expanded, and the uniformity of the light field is maintained within the expanded range, improving the filling light efficiency.
Smart Images
Figure CN120406031A_ABST
Abstract
Description
Technical Field
[0001] Embodiments of the present invention relate to a lighting device. Background Art
[0002] When taking pictures, it is a common practice to use a flash to supplement the light. However, the light emitted by the flash often scatters into the environment instead of concentrating on the object being photographed, resulting in poor light supplement efficiency. Therefore, a system that can improve the light concentration ability of the flash is needed. Summary of the Invention
[0003] Some embodiments of the present invention provide a lighting device, including: a light source for emitting a light beam; a collimating lens located on the optical path of the light beam for collimating the light beam; and a liquid lens located on the optical path of the light beam, and by changing the diopter of the liquid lens, the divergence angle of the light beam is changed.
[0004] Therefore, through the lighting device provided by the present invention, the lighting range of the light beam can be changed by changing the diopter of the liquid lens in an energized manner, and the light field uniformity within the lighting range is maintained. Description of the Drawings
[0005] Figure 1 is a schematic diagram of a lighting device according to an embodiment of the present invention;
[0006] Figure 2A and Figure 2B is a schematic diagram of a liquid lens according to an embodiment of the present invention;
[0007] Figure 3A is a schematic diagram of a lighting device according to an embodiment of the present invention;
[0008] Figure 3B is according to Figure 3A a schematic diagram of the lighting state of the lighting device shown;
[0009] Figure 4A is a schematic diagram of a lighting device according to an embodiment of the present invention;
[0010] Figure 4B is according to Figure 4A a schematic diagram of the lighting state of the lighting device shown;
[0011] Figure 5A is a light field distribution diagram of the lighting state of the lighting device according to the present invention;
[0012] Figure 5B is a light field distribution diagram of the lighting state of the lighting device according to the present invention;
[0013] Figure 6AIt is the optical field distribution diagram of the light-emitting state of the light-emitting device shown in the present invention;
[0014] Figure 6B It is the optical field distribution diagram of the light-emitting state of the light-emitting device shown in the present invention. Detailed implementation manners
[0015] Examples are listed below and described in detail in conjunction with the accompanying drawings. However, the provided examples are not intended to limit the scope covered by the present invention. In addition, the component sizes in the drawn figures are drawn for convenience of illustration and do not represent the actual component size ratios. Moreover, although terms such as "first" and "second" are used in the text to describe different components and / or film layers, these components and / or film layers should not be limited by these terms. Instead, these terms are only used to distinguish one component or film layer from another component or film layer. Therefore, the first component or film layer discussed below can be referred to as the second component or film layer without violating the teachings of the examples. For ease of understanding, similar components will be labeled with the same reference numerals in the following text.
[0016] In the description of the embodiments of the present invention, different examples may use repeated reference symbols and / or words. These repeated symbols or words are for the purpose of simplification and clarity and are not used to limit the relationship between each embodiment and / or the described appearance structure. Furthermore, if the following description of the present invention states that the first feature is formed on or above the second feature, it means that it includes the embodiment in which the above-mentioned first feature and the above-mentioned second feature are in direct contact, and also includes the embodiment in which additional features are formed between the above-mentioned first feature and the above-mentioned second feature, so that the above-mentioned first feature and the above-mentioned second feature may not be in direct contact. For ease of understanding, similar components will be labeled with the same reference numerals in the following text.
[0017] Figure 1 It is a schematic diagram of the light-emitting device shown in the embodiment of the present invention.
[0018] Please refer to Figure 1 . As Figure 1 shown, the light-emitting device 100 includes a light source 110, a collimating lens 120, and a liquid lens 130.
[0019] The light source 110 is used to emit a light beam L. In some embodiments, the light source 110 is a white light-emitting diode (LED) monochromatic LED, such as a red LED, a green LED, or a blue LED, or others with similar functions, and the present invention is not limited thereto. In some embodiments, the light source 110 may be an array composed of one LED or multiple LEDs, and the present invention is not limited thereto. In some embodiments, the light beam L is white light or monochromatic light, such as red light, green light, or blue light, and the present invention is not limited thereto.
[0020] The collimating lens 120 is located on the optical path of the light beam L and is used to collimate the light beam L. In some embodiments, the collimating lens has a positive refractive power. In some embodiments, the collimating lens 120 is a convex lens, a Fresnel lens, a metasurface lens, or others with similar functions, and the present disclosure is not limited thereto.
[0021] The liquid lens 130 is located on the optical path of the light beam L. By changing the refractive power of the liquid lens 130, the divergence angle of the light beam L can be changed. As Figure 1 shown, the liquid lens 130 includes a liquid layer 130B and a substrate 130D. The specific structure of the liquid lens 130 will be described below.
[0022] Therefore, the light source 110 emits the light beam L. After being collimated by the collimating lens 120, the light beam L is incident on the liquid lens 130. By changing the refractive power of the liquid layer 130B of the liquid lens 130, the divergence angle of the light beam L can be changed to meet the actual application requirements.
[0023] Figure 2A and Figure 2B is a schematic diagram of the liquid lens according to an embodiment of the present invention.
[0024] Please refer to and also refer to Figure 2A and Figure 2B . As Figure 2A and Figure 2B shown, the liquid lens 130 includes an electrode layer 130A, a liquid layer 130B, an electrode layer 130C, a substrate 130D, an electrode 130E, a frame 130F, and an air layer 130G.
[0025] The electrode layer 130A, the electrode layer 130C, and the liquid layer 130B are all disposed on the substrate 130D. The electrode layer 130A and the electrode layer 130C are used to cover the liquid layer 130B and confine the liquid within the frame 130F to form a sealed space so that the liquid layer 130B will not leak out. The electrode 130E is electrically connected to the electrode layer 130A and the electrode layer 130C.
[0026] The air layer 130G is located between the electrode layer 130C and the substrate 130D.
[0027] In this embodiment, the shape of the liquid layer 130B is variable to change the refractive power of the liquid lens 130.
[0028] Please refer to Figure 2A . As Figure 2AAs shown, when the electrode 130E does not energize the electrode layer 130A and the electrode layer 130C, the electrode layer 130A and the electrode layer 130C do not deform. At this time, the electrode layer 130A, the liquid layer 130B, and the electrode layer 130C form a structure similar to a plane mirror, and the refractive index is zero or substantially zero.
[0029] Please refer to Figure 2B . As Figure 2B shown, when the electrode 130E energizes the electrode layer 130A and the electrode layer 130C, the electrode layer 130A and the electrode layer 130C deform, thereby changing the shape of the liquid layer 130B. At this time, the electrode layer 130A, the liquid layer 130B, and the electrode layer 130C form a structure similar to a concave lens, and the refractive index is not zero. Specifically, at this time, the diopter of the optical structure formed by the electrode layer 130A, the liquid layer 130B, and the electrode layer 130C is less than zero.
[0030] Since the liquid lens 130 can be switched between a plane mirror (non-energized state) and a concave lens (energized state) according to the energization state, therefore, the maximum value of the diopter of the liquid lens 130 is substantially 0, that is, a plane mirror. When the diopter of the liquid lens 130 is not 0, the liquid lens 130 is a concave lens.
[0031] In this embodiment, the electrode layer 130A and the electrode layer 130C can have different bending degrees to change the shape of the liquid layer 130B and change the diopter of the optical structure formed by the electrode layer 130A, the liquid layer 130B, and the electrode layer 130C.
[0032] In this embodiment, the electrode layer 130C is in contact with the air layer 130G, so the electrode layer 130C can freely change its shape, increasing the variability of the shape of the liquid layer 130B.
[0033] In some embodiments, the electrode layer 130A and the electrode layer 130C are light-transmitting conductive materials, such as indium tin oxide (ITO) or other materials with similar properties. The present disclosure is not limited thereto.
[0034] In some embodiments, the liquid layer 132B is a light-transmitting optical liquid, such as silicone oil, mineral oil, fluorinated liquid, or other materials with similar properties. The present disclosure is not limited thereto.
[0035] In some embodiments, the air layer 130G can also be filled with other liquids, and the refractive index of the filled liquid is different from that of the liquid layer 130B to change the optical properties of the liquid lens.
[0036] In some embodiments, the liquid lens 130 may omit the air layer 130G and connect the electrode layer 130C to the substrate 130D to reduce the volume of the liquid lens 130. However, since the electrode layer 130C is connected to the substrate 130D, the shape of the electrode layer 130C cannot be changed, restricting the deformation of the liquid layer 130B.
[0037] In some embodiments, the substrate 130D is a transparent substrate, such as a glass substrate, a plastic substrate, or other materials with similar properties. The present disclosure is not limited thereto.
[0038] As described above, when the liquid layer 130B of the liquid lens 130 deforms due to the energization of the electrode layer 130A and the electrode layer 130C, the liquid layer 130B may have a spherical surface or a non-spherical surface. When the liquid layer 130B of the liquid lens 130 includes a non-spherical surface, the non-spherical surface of the liquid layer 130B of the liquid lens 130 can be expressed by Equation 1.
[0039] [Equation 1]
[0040]
[0041] In Equation 1, c is the reciprocal of the radius of curvature of the liquid layer 130B of the liquid lens 130, k is the conic constant, r is the distance from any point on the non-spherical surface to the optical axis, A4, A6, A8, A 10 [[ID=1-17]]are non-spherical surface constants, and Z is the height from a certain point on the non-spherical surface to the vertex of the corresponding non-spherical surface in the optical axis direction.
[0042] Table 1 and Table 2 show the lens characteristics of the light-emitting device 100 according to the present embodiment, and Table 3 shows the lens characteristics and aspheric values of the liquid layer 130B of the liquid lens 130 of the light-emitting device 100 according to the present embodiment. In Table 1, the gas layer 130G is not included.
[0043] Table 1
[0044]
[0045] Table 2
[0046]
[0047] Table 3
[0048]
[0049] Figure 3A is a schematic diagram of the light-emitting device according to an embodiment of the present invention. Figure 3B is according to Figure 3ASchematic diagram of the light-emitting state of the light-emitting device shown. For simplicity of illustration, only a partial structure of the liquid lens 130 is shown.
[0050] Please refer to Figure 3A and Figure 3B . As Figure 3A shown, the light source 110 emits a light beam L, which, after being collimated by the collimating lens 120, is incident on the liquid lens 130. In Figure 3A , no power is applied to the liquid lens 130. At this time, the liquid layer 130B of the liquid lens 130 does not deform, making the liquid lens 130 equivalent to a plane mirror. Therefore, the light beam L can directly pass through the liquid layer 130B of the liquid lens 130 and maintain the collimated state, illuminating a distant place, as Figure 3B shown.
[0051] Figure 4A is a schematic diagram of the light-emitting device shown according to an embodiment of the present invention. E is according to Figure 4B Schematic diagram of the light-emitting state of the light-emitting device shown. For simplicity of illustration, only a partial structure of the liquid lens 130 is shown.
[0052] Please refer to Figure 4A and Figure 4A . As Figure 4B shown, the light source 110 emits a light beam L, which, after being collimated by the collimating lens 120, is incident on the liquid lens 130. In Figure 4A , power is applied to the liquid lens 130. At this time, the liquid layer 130B of the liquid lens 130 deforms, making the liquid lens 130 equivalent to a concave lens. Therefore, when the light beam L passes through the liquid layer 130B of the liquid lens 130, the optical path of the light beam L will be changed by the liquid layer 130B of the liquid lens 130, causing the light beam L to diverge and generating a larger illumination range in the distance, as Figure 4A shown.
[0053] In this embodiment, when the light beam L is projected onto a plane perpendicular to the optical axis of the light beam L, the radius of the projection range of the light beam L increases as the absolute value of the diopter of the liquid lens 130 increases.
[0054] For example, in Figure 4B , since no power is applied to the liquid lens 130 and the absolute value of the diopter is 0, the radius of the projection range is small. In Figure 3B , since power is applied to the liquid lens 130 and the liquid lens 130 has a negative diopter with an absolute value greater than 0, the radius of the projection range is large. And the radius of the projection range increases as the absolute value of the diopter increases.
[0055] In this embodiment, when the light beam L is projected onto a plane perpendicular to the optical axis of the light beam L, the ratio of the maximum radius to the minimum radius of the projection range of the light beam L is greater than 5.
[0056] In this embodiment, when the light beam L is projected onto a plane perpendicular to the optical axis of the light beam L, the luminance uniformity of the projection range of the light beam L is greater than 80%.
[0057] Therefore, by changing the diopter of the liquid lens of the light-emitting device 100, the projection range of the light beam L can be effectively expanded, and a certain luminance uniformity can be maintained within the projection range.
[0058] The following is illustrated by examples.
[0059] Figure 4B is the light field distribution diagram of the light-emitting state of the light-emitting device shown in the present invention. Figure 5A is the light field distribution diagram of the light-emitting state of the light-emitting device shown in the present invention.
[0060] Please refer to Figure 5B 。 Figure 5A is a computer simulation of the light field distribution of the light beam L at a distance of 10 cm from the light source when the liquid lens 130 of the light-emitting device 100 is not energized. Where d1 is the diameter of the projection range of the light beam L with a luminance uniformity greater than 80%. In this embodiment, d1 is 2240 μm, and the irradiation range diameter is 6661 μm.
[0061] Please refer to Figure 5A 。 Figure 5B is a computer simulation of the light field distribution of the light beam L at a distance of 10 cm from the light source when the liquid lens 130 of the light-emitting device 100 is energized. Where d2 is the diameter of the projection range of the light beam L with a luminance uniformity greater than 80%. In this embodiment, d2 is 18000 μm, and the irradiation range diameter is 35000 μm.
[0062] Therefore, it can be known that in this embodiment, when the light beam L is projected onto a plane perpendicular to the optical axis of the light beam L, the ratio of the maximum radius to the minimum radius of the projection range of the light beam L is greater than 5. For example, d2 / d1 = 18000 / 2240 = 8.03. Therefore, by changing the diopter of the liquid lens 130, the light beam L can be effectively expanded, the illumination area can be increased, and the uniformity of the light beam L can be maintained.
[0063] Figure 5B is the light field distribution diagram of the light-emitting state of the light-emitting device shown in the present invention. Figure 6A is the light field distribution diagram of the light-emitting state of the light-emitting device shown in the present invention.
[0064] Please refer to Figure 6B and Figure 6A 。 Figure 6B is a computer simulation of the light field distribution of the light beam L at a distance of 10 cm from the light source when the liquid lens 130 of the light-emitting device 100 is not energized. Figure 6AIn a computer simulation mode, simulate the light field distribution of the light beam L at a distance of 10 cm from the light source when the liquid lens 130 of the light emitting device 100 is energized.
[0065] As Figure 6B shown, when the liquid lens 130 is not energized, the liquid lens 130 is equivalent to a plane mirror. Therefore, the light beam L emitted by the light source 110 is collimated by the collimating lens 120, passes through the liquid lens 130 equivalent to a plane mirror, and forms a light spot with concentrated light field on the projection plane.
[0066] As Figure 6A shown, when the liquid lens 130 is energized, the liquid lens 130 is equivalent to a concave lens. Therefore, the light beam L emitted by the light source 110 is collimated by the collimating lens 120, passes through the liquid lens 130 equivalent to a concave lens, and is diverged by the liquid lens 130, and forms a light spot with a diverged light field on the projection plane, and the illumination range is significantly larger than Figure 6B Figure 6A the situation when the liquid lens 130 is not energized in
[0067] Therefore, through the light emitting device provided by the present invention, the diopter of the liquid lens can be changed by energizing to change the illumination range of the light beam, and the light field uniformity within the illumination range can be maintained.
Claims
1. A light-emitting device, characterized in that, Comprising: A light source for emitting a light beam; A collimating lens located on the optical path of the light beam for collimating the light beam; And A liquid lens located on the optical path of the light beam, and by changing the diopter of the liquid lens, the divergence angle of the light beam is changed.
2. The light-emitting device according to claim 1, characterized in that, The light source is a white light-emitting diode or a monochromatic light-emitting diode.
3. The light-emitting device according to claim 1, wherein The light beam is white light or monochromatic light.
4. The light-emitting device according to claim 1, characterized in that, The collimating lens is a convex lens, a Fresnel lens or a metasurface lens.
5. The light-emitting device according to claim 1, characterized in that, When the light beam is projected onto a plane perpendicular to the optical axis of the light beam, the ratio of the maximum radius to the minimum radius of the projection range of the light beam is greater than 5.
6. The light-emitting device according to claim 1, wherein When the light beam is projected onto a plane perpendicular to the optical axis of the light beam, the brightness uniformity of the projection range of the light beam is greater than 80%.
7. The light-emitting device according to claim 1, characterized in that, The maximum value of the diopter of the liquid lens is substantially 0.
8. The light-emitting device according to claim 1, wherein, When the light beam is projected onto a plane perpendicular to the optical axis of the light beam, the radius of the projection range of the light beam increases as the absolute value of the diopter of the liquid lens increases.
9. The light-emitting device according to claim 1, wherein The liquid lens includes: a liquid layer and an air layer, wherein the shape of the liquid layer is variable to change the diopter of the liquid lens.
10. The light-emitting device according to claim 1, wherein, When the diopter of the liquid lens is not 0, the liquid lens is a concave lens.