Sky blue light source, and LED blue sky light and color mixing method thereof

Abstract

A sky blue light source with an LED chip 12 encapsulated on a substrate 11 and covered with a Sr2SiO4:Eu fluorescent powder layer 13 or Sr2SiO4:Eu adhesive layer, the LED chip emitting light with a peak wavelength of 460-485 nm. There may be a transparent isolation protective layer 14 covering the Sr2SiO4:Eu fluorescent powder layer 13. The sky blue light source may be provided in a housing (21, Figure 2), with a twilight blue light source, and the twilight blue light source and sky blue light source may be used for colour mixing. There may be a central window in the light housing, and a stack of plates comprising a shading plate (222, Figure 4), light guide plate (223, Figure 4), diffusion plate (224, Figure 4), and light transmission plate (225, Figure 4) arranged in the central window. The light source may be a lighting strip (231, Figure 4) provided with a lens to change a light-emitting angle.

Description

[0001] The present disclosure relates to the field of lighting, and specifically to a sky blue light source, and an LED blue sky light and a color mixing method thereof. BACKGROUND

[0002] At present, the lighting of enclosed indoor spaces is mostly ordinary and leads many enclosed rooms to look cramped, and in this environment, it is difficult for the human eyes to see sunlight, which easily makes people feel depressed and irritable, and does not contribute to the physical and mental health of people and the improvement of work efficiency.

[0003] For this problem, a light capable of simulating sunlight illumination, namely, the so-called blue sky light in the market, is proposed in the lighting industry. Light emitted from the blue sky light can illuminate objects to be illuminated (such as but not limited to walls or floors) from a specific angle like the sunlight, and forms lighting spots with dark and bright boundaries. Moreover, a scenario similar to the sunlight illumination can be presented through the special dispersion effect of the blue sky light, such that people can feel as if they are in the natural environment with the sunlight, the lighting comfort of people can be improved, and the impact of unhealthy emotions such as depression and irritability can be reduced.

[0004] At present, in order to achieve the blue sky effect of the blue sky light in the market, a light source needs to be used in cooperation with a special lens, such that a light body needs to be heightened. Such a solution affects the appearance and has a high cost, and the ceiling height is required to be at least about 30 cm in a mounting scenario, resulting in limited usage scenario and low applicability. SUMMARY

[0005] In view of this, the present disclosure provides a sky blue light source, and an LED blue sky light and a color mixing method thereof, to solve the above problems.

[0006] To achieve the above objective, the present disclosure provides the following technical solutions:

[0007] A sky blue light source is provided, including a substrate and an LED chip encapsulated on the substrate, where a peak wavelength range of light emitted from the LED chip is 460-485 nm; and an outer surface of the LED chip is covered with a Sr2SiO4 : Eu fluorescent powder layer or a Sr2SiO4 : Eu fluorescent adhesive layer.

[0008] Further, the outer surface of the LED chip is covered with the Sr2SiO4 : Eu fluorescent powder layer, and an outer surface of the S^SiCU : Eu fluorescent powder layer is covered with a transparent isolation protective layer.

[0009] Further, the outer surface of the LED chip is covered with a transparent encapsulation adhesive layer, and the SnSiCL : Eu fluorescent powder layer covers a surface of the encapsulation adhesive layer.

[0010] Further, the outer surface of the S^SiCU : Eu fluorescent powder layer is covered with the transparent isolation protective layer.

[0011] Further, the outer surface of the LED chip is covered with the Sr2SiO4 : Eu fluorescent adhesive layer formed by mixing Sr2SiO4 : Eu fluorescent powder with an encapsulation adhesive at a mass ratio of (1 : 30) to (1 : 50).

[0012] An LED blue sky light is provided, including a light housing and a blue sky light source, where the blue sky light source includes the sky blue light source described above.

[0013] Further, the blue sky light source further includes a twilight blue light source, and the sky blue light source and the twilight blue light source are subjected to color mixing at a certain output ratio to achieve at least the effects of mixed sky blue light and mixed twilight blue light, thereby presenting the blue sky effects in different time periods.

[0014] Further, the twilight blue light source includes blue light beads, red light beads, and green light beads, where an emitted light intensity ratio of the blue light beads to the red light beads to the green light beads is (100 ± 1) : (93 ± 1) : (99 ± 1).

[0015] Further, the LED blue sky light is a ceiling light, the light housing has a central window located in a center and an annular window located in a bottom periphery of the central window, the blue sky light source is arranged in the central window, and a lighting source is arranged in the annular window.

[0016] Further, a shading plate, a light guide plate, a diffusion plate, and a light transmission plate stacked in sequence are arranged in the central window, the light transmission plate faces a light-emitting surface of the light housing, the blue sky light source is arranged at a periphery of the light guide plate, and light beads on the blue sky light source directly face a peripheral surface of the light guide plate.

[0017] Further, the lighting source includes a lighting strip and a light transmission cover, and the lighting strip is arranged on an inner wall of the light housing whose light-emitting surface faces inward, and is covered by the light transmission cover; and the lighting strip is further provided with a lens capable of changing a light-emitting angle.

[0018] Further, the lighting source includes a lighting strip, where a light-emitting surface of a blue sky light body including the blue sky light source is not on the same plane as a light-emitting surface of the lighting strip of the lighting source located at a periphery, and the light-emitting surface of the lighting strip is 2-20 mm higher than the light-emitting surface of the blue sky light body; and light beads of the lighting strip are arranged downwards, such that an angle of illuminating light emitted from the lighting source is 20-100°.

[0019] Further, the light housing extends downward by 5-20 mm between the central window and the annular window to form a spacer plate, light beads of the lighting source are assembled on an outer sidewall of the spacer plate, light emitted from the light beads of the lighting source is reflected by the light housing and emitted through a lower light outlet, and an angle of emission from the lighting source through the lower light outlet is 20-100°.

[0020] A color mixing method for an LED blue sky light is provided, where the LED blue sky light described above is used; a sky blue light source emits sky blue light, and a twilight blue light source emits twilight blue light; when an output ratio of the sky blue light is 60-100% and an output ratio of the twilight blue light is 0-40%, mixing is performed to obtain the sky blue light; and when the output ratio of the sky blue light is 0-40% and the output ratio of the twilight blue light is 60-100%, mixing is performed to obtain the twilight blue light.

[0021] With the technical solutions provided by the present disclosure, the present disclosure has the following beneficial effects:

[0022] The sky blue light source includes the LED chip where the peak wavelength range of the light emitted is 460-485 nm, and the SrSiO. : Eu fluorescent powder layer or the Sr2SiO4 : Eu fluorescent adhesive layer covering the LED chip, making it achieve the sky blue light effect. A special lens does not need to be used in cooperation, and a height of a light body does not need to be increased, such that the light is effectively reduced in size and cost.

[0023] Through the color mixing method for the LED blue sky light according to the present application, when the white lighting source is used in cooperation, the lighting source can emit sufficiently bright white light, without affecting the effect of emitting the sky blue light or the twilight blue light by the blue sky light source. BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a schematic diagram of a structure of a sky blue light source in Embodiment 1;

[0025] FIG. 2 is a first schematic diagram of an appearance of an LED blue sky light in Embodiment 1;

[0026] FIG. 3 is a second schematic diagram of an appearance of an LED blue sky light in Embodiment 1;

[0027] FIG. 4 is a schematic exploded view of a structure of an LED blue sky light in Embodiment 1;

[0028] FIG. 5 is a sectional view of an LED blue sky light in Embodiment 1;

[0029] FIG. 6 is a schematic enlarged view of a region A in FIG. 5;

[0030] FIG. 7 is a schematic diagram of a structure of a sky blue light source in Embodiment 2;

[0031] FIG. 8 is a sectional view of an LED blue sky light in Embodiment 2;

[0032] FIG. 9 is a schematic enlarged view of a region B in FIG. 8;

[0033] FIG. 10 is a schematic diagram of a structure of a sky blue light source in Embodiment 3;

[0034] FIG. 11 is a schematic exploded view of a structure of an LED blue sky light in Embodiment 3;

[0035] FIG. 12 is a schematic exploded view of a structure of an LED blue sky light in Embodiment 4;

[0036] FIG. 13 is a sectional view of a structure of an LED blue sky light in Embodiment 5;

[0037] FIG. 14 is a schematic diagram of a partial structure shown in FIG. 13;

[0038] FIG. 15 is a sectional view of a structure of an LED blue sky light in Embodiment 6; and

[0039] FIG. 16 is a schematic diagram of a partial structure shown in FIG. 15. DESCRIPTION OF EMBODIMENTS

[0040] To further describe embodiments, the present disclosure provides accompanying drawings. These drawings constitute a part of content of the present disclosure and are mainly used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the related description of the specification. With reference to the content, those of ordinary skill in the art can understand other possible embodiments and advantages of the present disclosure. Components in figures are not drawn to scale, and similar component signs are often used to refer to similar components.

[0041] The present disclosure is now further described in conjunction with the accompanying drawings and specific embodiments.

[0042] Embodiment 1

[0043] Referring to FIG. 1, a sky blue light source provided by this embodiment includes a substrate 11 and an LED chip 12 encapsulated on the substrate 11, where a peak wavelength range of light emitted from the LED chip 12 is 460-485 nm; and an outer surface of the LED chip 12 is covered with a Sr2SiO4 : Eu fluorescent powder layer 13, which, specifically, refers to a fluorescent powder layer laid with Sr2SiO4 : Eu fluorescent powder. Specifically, in this embodiment, the outer surface of the LED chip 12 is covered with the Sr2SiO4 : Eu fluorescent powder layer, and then a surface of the Sr2SiO4 : Eu fluorescent powder layer is covered with a transparent isolation protective layer (defined as a first isolation protective layer 14), where the first isolation protective layer 14 is an epoxy resin layer, a silica gel layer, or the like for encapsulation, such that stable encapsulation can be implemented. Certainly, in other embodiments, the first isolation protective layer 14 may not be arranged. [00441 Continuing to refer to FIG. 2 to FIG. 6, this embodiment further provides an LED blue sky light, including a light housing 21 and a blue sky light source 221, where the blue sky light source 221 includes the sky blue light source described above. The sky blue light source operates at rated power after being energized to achieve the sky blue light effect.

[0045] Specifically, in this embodiment, the LED blue sky light is a ceiling light, the light housing 21 has a central window located in a center and an annular window located in a bottom periphery of the central window, the blue sky light source 221 is arranged in the central window for main lighting, and a lighting source 23 is arranged in the annular window and mainly achieves the effects of decoration and lighting.

[0046] A shading plate 222, a light guide plate 223, a diffusion plate 224, and a light transmission plate 225 stacked in sequence are arranged in the central window, the light transmission plate 225 faces a light-emitting surface of the light housing 21, the blue sky light source 221 is arranged at a periphery of the light guide plate 223, and light beads on the blue sky light source 221 directly face a peripheral surface of the light guide plate 223.

[0047] Light emitted from the blue sky light source 221 is incident into the light guide plate 223 through the peripheral surface of the light guide plate 223, then emitted from a bottom surface of the light guide plate 223 to the diffusion plate 224, and finally emitted through the light transmission plate 225 after being uniformly diffused by the diffusion plate 224. The shading plate 222 is arranged at a top of the light guide plate 223, such that the light cannot be emitted from the top.

[0048] Specifically, the blue sky light source 221, the shading plate 222, the light guide plate 223, the diffusion plate 224, and the light transmission plate 225 form a blue sky light body 22.

[0049] The lighting source 23 includes a lighting strip 231 and a light transmission cover 232, where the lighting strip 231 is arranged on an inner wall of the light housing 21 whose light-emitting surface faces inward, and is covered by the light transmission cover 232. Specifically, the lighting strip 231 may be an existing white lighting strip or the like, which is mainly used for decoration and lighting. Specifically, a light transmission surface of the light transmission cover 232 that corresponds to the lighting strip 231 is a downward inclined surface, which can better provide illumination downwards. [00501 Certainly, in other embodiments, the lighting source 23 may not be arranged.

[0051] Moreover, the LED blue sky light may be a panel light, a ceiling light, or the like.

[0052] In this way, with the solution in the present application, a special lens does not need to be used in cooperation to obtain sky blue light, and a height of a light body does not need to be increased, such that the light is effectively reduced in size and cost.

[0053] Embodiment 2

[0054] Referring to FIG. 7, a sky blue light source provided by this embodiment includes a substrate 11 and an LED chip 12 encapsulated on the substrate 11, where a peak wavelength range of light emitted from the LED chip 12 is 460-485 nm; and an outer surface of the LED chip 12 is covered with a SnSiO_ : Eu fluorescent powder layer 16, which, specifically, refers to a fluorescent powder layer laid with Sr2SiO4 : Eu fluorescent powder. Specifically, in this embodiment, the outer surface of the LED chip 12 is covered with an encapsulation adhesive layer 15, and the Sr2SiO4 : Eu fluorescent powder layer 16 covers a surface of the encapsulation adhesive layer 15. In this way, a remote fluorescent powder structure is obtained, such that the Sr2SiO4 : Eu fluorescent powder layer 16 gets away from the LED chip 12 and is prevented from being affected by heat generated by the LED chip 12.

[0055] More preferably, an outer surface of the Sr2SiO4 : Eu fluorescent powder layer 16 is covered with a transparent isolation protective layer (defined as a second isolation protective layer 17). In this way, isolation protection of the Sr2SiO4 : Eu fluorescent powder layer 16 is implemented. Specifically, both the encapsulation adhesive layer 15 and the second isolation protective layer 17 may be existing epoxy resin layers, silica gel layers, or the like used for encapsulation.

[0056] This embodiment further provides an LED blue sky light. Specifically, the LED blue sky light has the roughly same structure as that of Embodiment 1, and is also the ceiling light. There is the difference that referring to FIG. 8 and FIG. 9, the blue sky light source 221 includes the sky blue light source described in Embodiment 2 and a twilight blue light source. Specifically, in this embodiment, the twilight blue light source includes blue light beads, red light beads, and green light beads, where an emitted light intensity ratio of the blue light beads to the red light beads to the green light beads is (100 ± 1) : (93 ± 1) : (99 ± 1). If the power of the twilight blue light source is adjusted to 15-20% of its rated power, twilight blue light is obtained. Certainly, in other embodiments, the twilight blue light source is not limited thereto.

[0057] A light transmission surface, corresponding to a lighting strip 231, of a light transmission cover 232 of a lighting source 23 has a smaller inclination than the structure in Embodiment 1. The lighting source 23 further includes a shading ring 233. The shading ring 233 is arranged at a bottom of the light transmission cover 232 to fix the light transmission cover 232 to a light housing 21. Moreover, the shading ring 233 can shade light emitted downwards from the lighting strip 231, such that more light from the lighting strip 231 is transversely emitted towards the center and thus cooperates with light emitted from the blue sky light source 221 to achieve a better light effect.

[0058] This embodiment further provides a color mixing method for an LED blue sky light, where the LED blue sky light in this embodiment is used; a sky blue light source emits sky blue light, and a twilight blue light source emits twilight blue light; when an output ratio of the sky blue light is 60-100% and an output ratio of the twilight blue light is 0-40%, mixing is performed to obtain mixed sky blue light; and when the output ratio of the sky blue light is 0-40% and the output ratio of the twilight blue light is 60-100%, mixing is performed to obtain mixed twilight blue light.

[0059] In this embodiment, the mixed sky blue light or the mixed twilight blue light is obtained by light mixing, and when the white lighting source 23 is used in cooperation, the lighting source 23 can emit sufficiently bright white light, without affecting the effect of emitting the sky blue light or the twilight blue light by the blue sky light source 221.

[0060] Embodiment 3

[0061] Referring to FIG. 10, a sky blue light source provided by this embodiment includes a substrate 11 and an LED chip 12 encapsulated on the substrate 11, where a peak wavelength range of light emitted from the LED chip 12 is 460-485 nm; and an outer surface of the LED chip 12 is covered with a SnSiO. : Eu fluorescent adhesive layer 18, which, specifically, is obtained by mixing Sr2SiO4 : Eu fluorescent powder with an encapsulation adhesive at a ratio.

[0062] Specifically, as a preferred solution, in this embodiment, the Sr2SiO4 : Eu fluorescent adhesive layer 18 is formed by mixing the Sr2SiO4 : Eu fluorescent powder with the encapsulation adhesive at a mass ratio of (1 : 30) to (1 : 50). Specifically, the encapsulation adhesive is epoxy resin, silica gel, or the like.

[0063] An LED blue sky light provided by this embodiment has the roughly same structure as Embodiment 2, and there is the difference that in this embodiment, a blue sky light source 221 includes the sky blue light source described in Embodiment 3.

[0064] Continuing to refer to FIG. 11, a light housing 21 is formed by combining a back plate 211 with a light frame 212, and the back plate 211 is assembled with a driving power supply 24, that is, the driving power supply 24 is integrated in the whole light.

[0065] Moreover, a lighting strip 231 is equipped with a lens 234 capable of changing a light-emitting angle. By adding the lens 234, the light-emitting angle of a lighting source 23 can be adjusted according to actual requirements, the influence of main illumination light on the blue sky light source can be well handled, blue sky light and the illumination light can be used simultaneously, and the light-emitting effect of the blue sky light source 221 will not be affected.

[0066] Specifically, the lens 234 capable of changing the light-emitting angle is an existing lens, such as an LED lens disclosed in CN201348192Y. The lens 234 is matched with the LED chip, has a small size, and is arranged on the lighting strip 231. There are sufficient layout spaces, such that the layout of the whole light will not be affected.

[0067] Specifically, the lens 234 may be encapsulated together with the LED chip during encapsulation of LED light beads, that is, the lens is arranged on a light bead of the lighting strip 231, or the lens may be added to a surface of the light bead of the lighting strip 231, that is, the lens 234 is not arranged on the light bead, but is subsequently mounted on the lighting strip 231.

[0068] Embodiment 4

[0069] An LED blue sky light provided by this embodiment has the roughly same structure as Embodiment 3, and there is the difference that as shown in FIG. 12, the LED blue sky light is a square ceiling light, and a back plate 211, a light frame 212, a shading plate 222, a light guide plate 223, a diffusion plate 224, and a light transmission plate 225 are all of a square structure.

[0070] Embodiment 5

[0071] An LED blue sky light provided by this embodiment has the roughly same structure as Embodiment 4. There is the difference that as shown in FIG. 13 and FIG. 14, a light-emitting surface of a blue sky light body 22 including the blue sky light source 221 is not on the same plane as a light-emitting surface of the lighting strip 231 located at a periphery, where the light-emitting surface of the blue sky light body 22 is a bottom surface of the light transmission plate 225. The light-emitting surface of the lighting strip 231 is 2-20 mm higher than the light-emitting surface of the blue sky light body 22. That is, as shown in FIG. 14, the lighting strip 231 is set to float upwards, and the floating height Hl of the lighting strip 231 relative to the bottom surface of the light transmission plate 225 is 2-20 mm. Moreover, light beads of the lighting strip 231 are arranged downwards, such that illuminating light emitted from the lighting strip 231 shines downward, and an angle a of emission from the light transmission cover 232 is 20-100°, that is, an angle a of illuminating light emitted from the lighting source 23 is 20-100°. In this way, white light emitted from the lighting source 23 when turned on does not affect light emitted from the blue sky light body 22.

[0072] Embodiment 6

[0073] An LED blue sky light provided by this embodiment has the roughly same structure as Embodiment 4. There is the difference that as shown in FIG. 15 and FIG. 16, the light housing 21 extends downward by 5-20 mm between the central window and the annular window to form a spacer plate 213, that is, as shown in FIG. 16, the downward extension height H2 of the spacer plate 213 is 5-20 mm. Light beads of the lighting source 23 (i.e., light beads of the lighting strip 231) are assembled on an outer sidewall of the spacer plate 213. As shown in FIG. 16, light emitted from the light beads of the lighting source 23 is reflected by the light housing 21 and emitted through a lower light outlet, that is, emitted from the light transmission cover 232, and an angle b of emission from the lighting source 23 through the lower light outlet is 20-100°. In this way, white light emitted from the lighting source 23 when turned on does not affect light emitted from the blue sky light body 22.

[0074] While the present disclosure has been specifically shown and described with reference to preferred embodiments, it is to be understood by those skilled in the art that various changes in form and details may be made to the present disclosure without departing from the spirit and scope of the present disclosure defined by the appended claims, and all fall within the scope of protection of the present disclosure.

Claims

1. A sky blue light source, comprising a substrate and an LED chip encapsulated on the substrate, wherein a peak wavelength range of light emitted from the LED chip is 460-485 nm; and an outer surface of the LED chip is covered with a Sr2SiO4 : Eu fluorescent powder layer or a Sr2SiO4 : Eu fluorescent adhesive layer.

2. The sky blue light source according to claim 1, wherein the outer surface of the LED chip is covered with the SnSiO. : Eu fluorescent powder layer, and an outer surface of the Sr2SiO4 : Eu fluorescent powder layer is covered with a transparent isolation protective layer.

3. The sky blue light source according to claim 1, wherein the outer surface of the LED chip is covered with a transparent encapsulation adhesive layer, and the Sr2SiO4 : Eu fluorescent powder layer covers a surface of the encapsulation adhesive layer.

4. The sky blue light source according to claim 1, wherein the outer surface of the LED chip is covered with the Sr2SiO4 : Eu fluorescent adhesive layer formed by mixing Sr2SiO4 : Eu fluorescent powder with an encapsulation adhesive at a mass ratio of (1 : 30) to (1 : 50).

5. An LED blue sky light, comprising a light housing and a blue sky light source, wherein the blue sky light source comprises the sky blue light source according to any one of claims 1 to 4.

6. The LED blue sky light according to claim 5, wherein the blue sky light source further comprises a twilight blue light source, and the sky blue light source and the twilight blue light source are subjected to color mixing at a certain output ratio to achieve at least the effects of mixed sky blue light and mixed twilight blue light.

7. The LED blue sky light according to claim 5 or 6, wherein the LED blue sky light is aceiling light, the light housing has a central window located in a center and an annular window located in a bottom periphery of the central window, the blue sky light source is arranged in the central window, and a lighting source is arranged in the annular window.

8. The LED blue sky light according to claim 7, wherein a shading plate, a light guide plate, a diffusion plate, and a light transmission plate stacked in sequence are arranged in the central window, the light transmission plate faces a light-emitting surface of the light housing, the blue sky light source is arranged at a periphery of the light guide plate, and light beads on the blue sky light source directly face a peripheral surface of the light guide plate.

9. The LED blue sky light according to claim 7, wherein the lighting source comprises a lighting strip and a light transmission cover, and the lighting strip is arranged on an inner wall of the light housing whose light-emitting surface faces inward, and is covered by the light transmission cover; and the lighting strip is further provided with a lens capable of changing a light-emitting angle.

10. The LED blue sky light according to claim 7, wherein the lighting source comprises a lighting strip, a light-emitting surface of a blue sky light body comprising the blue sky light source is not on the same plane as a light-emitting surface of the lighting strip of the lighting source located at a periphery, and the light-emitting surface of the lighting strip is 2-20 mm higher than the light-emitting surface of the blue sky light body; and light beads of the lighting strip are arranged downwards, such that an angle of illuminating light emitted from the lighting source is 20-100°.

11. The LED blue sky light according to claim 7, wherein the light housing extends downward by 5-20 mm between the central window and the annular window to form a spacer plate, light beads of the lighting source are assembled on an outer sidewall of the spacer plate, light emitted from the light beads of the lighting source is reflected by the light housing and emitted through a lower light outlet, and an angle of emission from the lighting source through the lower light outlet is 20-100°.

12. A color mixing method for an LED blue sky light, wherein the LED blue sky light according to claim 6 is used; a sky blue light source emits sky blue light, and a twilight blue light source emits twilight blue light; when an output ratio of the sky blue light is 60-100% and an output ratio of the twilight blue light is 0-40%, mixing is performed to obtain mixed sky blue light; and when the output ratio of the sky blue light is 0-40% and the output ratio of the twilight blue light is 60-100%, mixing is performed to obtain mixed twilight blue light.15

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