Light-emitting device and lamp

Abstract

The invention provides a light-emitting device and a lamp. The light-emitting device comprises a light source and a light filtering part, the light source is used for emitting laser, the light filtering part is located on a light path of the light source emitting laser, the center of the light filtering part passes through the optical axis of the light source, and the transmittance of the light filtering part to light with the same wavelength is increased from the center to the edge, so that the light filtering part can reduce transmission at the center of a light spot of the light source. And the uniformity of light spots emitted by the light-emitting device at the center and the edge can be balanced.

Description

Technical Field

[0001] The present invention relates to the field of light emitting technology, and in particular to a light emitting device and a lamp. Background Art

[0002] In the light emitting device of the related art, the required color light is generally obtained by exciting the phosphor by laser. However, the color distribution of the light spot of the current light emitting device is generally not uniform. Summary of the invention

[0003] The embodiments of the present invention provide a light emitting device and a lamp to improve the above technical problems.

[0004] The embodiments of the present invention achieve the above-mentioned purpose through the following technical solutions.

[0005] In the first aspect, an embodiment of the present invention provides a light-emitting device, which includes a light source and a filter. The light source is used to emit light, and the filter is located in the optical path of the light emitted by the light source. The center of the filter passes through the optical axis of the light source, and the transmittance of the filter to light of the same wavelength increases from the center to the edge.

[0006] In some embodiments, the light source is a laser module, and the light emitting device further includes a wavelength converter located in the light path of the filter element. The wavelength converter is used to receive the laser transmitted through the filter element and at least partially convert the laser into converted light.

[0007] In some embodiments, the light source includes an excitation light module and a wavelength converter, wherein the wavelength converter is located in the optical path of the excitation light emitted by the excitation light module, and the wavelength converter is used to receive the excitation light emitted by the excitation light module and at least partially convert the excitation light into stimulated light.

[0008] In some embodiments, the transmittance of the filter for light of the same wavelength gradually increases from the center to the edge; or, the transmittance of the filter for light of the same wavelength gradually increases from the center to the edge.

[0009] In some embodiments, the filter includes a first filter area and a second filter area connected to each other, the center of the filter is located in the first filter area, and the second filter area surrounds the first filter area; for the same wavelength, the transmittance of the first filter area is less than the transmittance of the second filter area.

[0010] In some embodiments, the transmittance of the first filter region to light of the same wavelength is consistent; or, the transmittance of the first filter region to light of the same wavelength gradually increases from the center to the second filter region.

[0011] In some embodiments, the transmittance of the second filter region to light of the same wavelength is consistent; or, the transmittance of the second filter region to light of the same wavelength gradually increases in a direction away from the first filter region.

[0012] In some embodiments, the first filter region is circular, and the second filter region is annular.

[0013] In some embodiments, the wavelength is 400nm~450nm; or, the transmittance of the same part of the filter to light with a wavelength of 400nm~450nm is consistent; or, the transmittance of the same part of the filter to light with a wavelength of 400nm~450nm decreases as the wavelength increases.

[0014] In a second aspect, an embodiment of the present invention provides a lamp, comprising a housing and a light-emitting device in any one of the above embodiments, wherein the light-emitting device is mounted on the housing.

[0015] In the light-emitting device and lamp provided in the embodiments of the present invention, the light source of the light-emitting device is used to emit light, the filter is located in the optical path of the light emitted by the light source, the center of the filter passes through the optical axis of the light source, and the transmittance of the filter to light of the same wavelength increases from the center to the edge, so that the filter can reduce the transmission at the center of the light spot of the light source, which helps to balance the uniformity of the light spot emitted by the light-emitting device at the center and the edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of a light emitting device provided in an embodiment of the present invention is shown.

[0018] Figure 2 A schematic structural diagram of a light emitting device provided in another embodiment of the present invention is shown.

[0019] Figure 3 A schematic diagram of a transmittance curve of a filter element of a light emitting device provided in an embodiment of the present invention is shown.

[0020] Figure 4 A schematic diagram of a transmittance curve of a filter element of a light emitting device provided in another embodiment of the present invention is shown.

[0021] Figure 5 A schematic structural diagram of a light filter element of a light emitting device provided in an embodiment of the present invention is shown.

[0022] Figure 6 A schematic structural diagram of a filter element of a light emitting device provided in another embodiment of the present invention is shown.

[0023] Figure 7 A schematic diagram of a transmittance curve of a filter element of a light emitting device provided in another embodiment of the present invention is shown.

[0024] Figure 8 A schematic structural diagram of a lamp provided in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] With the improvement of the efficiency of laser light sources and the reduction of costs, the scheme of obtaining white light by exciting phosphors with blue lasers has been gradually applied in stage lighting. However, the inventors of the present application have found through research that the light intensity of blue lasers is high, and the light intensity projected onto the fluorescent element is Gaussian distributed, resulting in high blue light intensity at the center of the light spot and low blue light intensity at the edge of the light spot. In addition, because the blue light intensity at the center of the light spot is too high, the blue light excites the phosphor to be oversaturated, resulting in overheating at the center of the phosphor, and low excitation efficiency at the center relative to the edge, which will further cause more blue light at the center of the outgoing light spot and less blue light at the edge, resulting in a high color temperature at the center of the outgoing light spot, a low color temperature at the edge, and uneven color distribution of the light spot.

[0028] See also Figure 1 An embodiment of the present invention provides a light emitting device 100, which includes a light source 10 and a filter 20. The light source 10 is used to emit light, and the filter 20 is located in the optical path of the light emitted by the light source 10.

[0029] In some embodiments, the light emitted by the light source 10 may be white light or light of other colors.

[0030] In some embodiments, the light emitted by the light source 10 may be laser light, fluorescent light, a combination of laser light and fluorescent light, or other types of light.

[0031] In some embodiments, the center of the optical filter 20 passes through the optical axis 11 of the light source 10 , so that the center of the light spot emitted by the light source 10 can coincide with the center of the optical filter 20 or the centers of the two are relatively close.

[0032] In some embodiments, the transmittance of the filter 20 for light of the same wavelength increases from the center to the edge. In this way, the filter 20 can reduce the transmission at the center of the light spot of the light source 10, which helps to balance the uniformity of the light spot emitted by the light-emitting device 100 at the center and the edge. In addition, when the light emitted by the light source is white light, the filter 20 helps to balance the color temperature of the light spot emitted by the light-emitting device 100 at the center and the edge, which helps to improve the uniformity of the color temperature of the light spot. And because the center of the filter 20 passes through the optical axis 11 of the light source 10, the filter 20 can better reduce the color temperature at the center of the light spot of the light source 10.

[0033] In some embodiments, the transmittance of the filter 20 may be designed differently according to the light emitted by the light source 10. For example, when the light emitted by the light source 10 is white light, the transmittance of the filter 20 may be designed by measuring the color temperature of the light spot (light parameter information from the center to the edge) and CIE1931 (x, y), and setting the chromaticity coordinates of the target position to CIE1931 (x, y) through colorimetric knowledge and algorithms, thereby calculating the optical power spectrum of each point from the center to the edge. For the specific calculation method, refer to the prior art.

[0034] In some embodiments, the light source 10 may be a fluorescent element including a wavelength conversion material, for example, Figure 2 The light source 10 may include an excitation light module 12 and a wavelength conversion element 30. The wavelength conversion element 30 is located in the optical path of the excitation light emitted by the excitation light module 12. The wavelength conversion element 30 is used to receive the excitation light emitted by the excitation light module 12 and at least partially convert the excitation light into a converted light. The excitation light module 12 may be a laser diode (Laser Diode) or a light emitting diode (Light Emitting Diode).

[0035] In some embodiments, the light source 10 may also be a light source that does not include a wavelength conversion material, and the light emitting device 100 may be provided with a wavelength conversion material to emit fluorescence. Figure 1 , the light source 10 may be a laser module, and the light emitting device 100 may further include a wavelength converter 30, the wavelength converter 30 is located in the light transmission path of the filter 20, and the wavelength converter 30 is used to receive the laser transmitted through the filter 20 and at least partially convert the laser into converted light. The laser module may be a laser diode.

[0036] In some embodiments, the wavelength conversion element 30 includes a wavelength conversion material, and the light received by the wavelength conversion material is used as excitation light. Excitation light and stimulation light are relative concepts. Excitation light refers to light that can excite the wavelength conversion material and cause the wavelength conversion material to generate light of different wavelengths. The stimulation light refers to light generated by the wavelength conversion material when it is excited by the excitation light. For example, blue light excites the yellow light conversion material to generate yellow light. In this case, the blue light is the excitation light and the yellow light is the stimulation light. Yellow light excites the red conversion material to generate red light. In this case, the yellow light is the excitation light and the red light is the stimulation light. Blue light excites the green light conversion material to generate green light. In this case, the blue light is the excitation light and the green light is the stimulation light. Among them, Figure 1 In the embodiment, the excitation light emitted by the light source 10 is blue light, and the converted light emitted by the wavelength conversion element 30 is yellow fluorescence.

[0037] In some embodiments, the wavelength conversion material may include phosphorescent materials, such as phosphors, or nanomaterials, such as quantum dots, or fluorescent materials, which are not listed here one by one.

[0038] In some embodiments, when the light emitting device 100 includes the wavelength conversion element 30, the light source 10 may include a blue semiconductor laser diode, and the light source 10 is used to emit blue laser light. The number of blue semiconductor laser diodes may be one or more than one. A plurality of blue semiconductor diodes may form a semiconductor diode array.

[0039] In some embodiments, the blue semiconductor laser diode is a gallium nitride-based blue laser, which has low luminous efficiency and manufacturing cost.

[0040] In some embodiments, the light source 10 may also be provided with a heat dissipation device, which is provided on the wavelength conversion element 30 to dissipate heat. For example, the heat dissipation device may be a heat dissipation fin.

[0041] When the wavelength converter 30 is a reflective wavelength converter, the heat sink may be disposed on a surface opposite to the light emitting surface of the wavelength converter 30. When the wavelength converter 30 is a transmissive wavelength converter, the heat sink may be disposed at a location other than the light emitting surface of the wavelength converter 30.

[0042] In this way, the excess heat is discharged to the surrounding environment by using the heat dissipation device, so that the temperature of the wavelength conversion material will not be too high to affect the luminous efficiency of the wavelength conversion element 30 .

[0043] In some embodiments, the wavelength of the light may be 400nm to 450nm. Thus, since the light with a wavelength of 400nm to 450nm is blue light, it is convenient for the light emitting device 100 to utilize blue light, for example, to mix blue light with yellow light to obtain white light, or to utilize blue light to excite the wavelength conversion element 30 to generate yellow light or other color light.

[0044] In addition, due to the high intensity of the blue excitation light, the intensity difference between the center and the edge of the blue excitation light spot is relatively large. By using the filter 20 to reduce the transmission at the center of the blue light spot, it helps to balance the uniformity of the light spot emitted by the light-emitting device 100 at the center and the edge.

[0045] See also Figure 3 ,in, Figure 3 The value of the horizontal axis in is the wavelength, in nm; the value of the vertical axis is the transmittance. In some embodiments, the transmittance of the same part of the filter 20 for light with a wavelength of 400nm to 450nm can be consistent. In this way, by making the transmittance of the same part of the filter 20 for different wavelengths consistent, it helps to simplify the design of the transmittance of the filter 20.

[0046] For example, the transmittance of the light with a wavelength of 400nm to 450nm at the center position 21 of the filter 20 is consistent. For another example, the transmittance of the light with a wavelength of 400nm to 450nm at the center position 22 of the filter 20 is consistent. For another example, the transmittance of the light with a wavelength of 400nm to 450nm at the edge position 23 of the filter 20 is consistent. For another example, the transmittance of the light with a wavelength of 400nm to 450nm at the edge position 24 of the filter 20 is consistent.

[0047] See also Figure 4 ,in, Figure 4 The value of the horizontal axis in is the wavelength, in nm; the value of the vertical axis is the transmittance. In some embodiments, the transmittance of the same part of the filter 20 for light with a wavelength of 400nm to 450nm can decrease as the wavelength increases. In this way, by making the transmittance of the same part of the filter 20 for light of different wavelengths inconsistent, it helps the filter 20 to better match the transmission of light of different wavelengths, so that the change of the light emitted by the filter 20 is smoother.

[0048] For example, the transmittance of the light with a wavelength of 400nm to 450nm at the center position 21 of the filter 20 may decrease as the wavelength increases. For another example, the transmittance of the light with a wavelength of 400nm to 450nm at the center position 22 of the filter 20 may decrease as the wavelength increases. For another example, the transmittance of the light with a wavelength of 400nm to 450nm at the edge position 23 of the filter 20 may decrease as the wavelength increases. For another example, the transmittance of the light with a wavelength of 400nm to 450nm at the edge position 24 of the filter 20 may decrease as the wavelength increases.

[0049] In some embodiments, see Figure 5 , the transmittance of the filter 20 to the light of the same wavelength can be gradually increased from the center to the edge. Wherein, gradually increasing means that the position of the filter 20 that is farther away from the center has a greater transmittance to the light of the same wavelength at that position. In this way, the filter 20 can gradually increase the luminous flux of the light emitted by the light source 10 from the center to the edge, which helps to balance the uniformity of the light spot emitted by the light emitting device 100 from the center to the edge.

[0050] In some embodiments, the transmittance of the filter 20 to light of the same wavelength can be increased gradually from the center to the edge. The gradient increase means that, in the filter 20, the positions within the first range of distance from the center have the same transmittance to light of the same wavelength; and in the positions within the second range of distance from the center greater than the first range, the positions within the second range have the same transmittance to light of the same wavelength, and the transmittance of the positions within the second range to light is greater than the transmittance of the positions within the first range to light. In this way, the filter 20 can also increase the transmission of the light spot of the light source 10 from the center to the edge, which helps to balance the uniformity of the light spot emitted by the light-emitting device 100 from the center to the edge.

[0051] In some embodiments, the filter element 20 may be provided with at least two filter regions to achieve a gradual increase in the transmittance of light of the same wavelength from the center to the edge. Figure 6 The filter element 20 may include a first filter area 21 and a second filter area 22, and the first filter area 21 and the second filter area 22 are connected. The center of the filter element 20 may be located at the first filter area 21, and the second filter area 22 may surround the first filter area 21.

[0052] For the same wavelength, the transmittance of the first filter region 21 may be less than the transmittance of the second filter region 22. In this way, the first filter region 21 can reduce the transmission at the center of the light spot of the light source 10, while the second filter region 22 increases the transmission of the light spot of the light source 10 compared to the first filter region 21, thereby facilitating the balance of the uniformity of the light spot emitted by the light emitting device 100 after passing through the first filter region 21 and the second filter region 22.

[0053] In some embodiments, the transmittance of the first filter region 21 to light of the same wavelength may be consistent, that is, the transmittance of light of the same wavelength at any position in the first filter region 21 remains consistent. This helps to simplify the design of the transmittance of the first filter region 21.

[0054] In some embodiments, the transmittance of the first filter region 21 to light with a wavelength of 400nm to 450nm may be consistent, that is, the transmittance of light with a wavelength of 400nm to 450nm is consistent at any position in the first filter region 21. In this way, by making the transmittance of each position of the first filter region 21 to different wavelengths consistent, it is helpful to simplify the design of the transmittance of the first filter region 21.

[0055] In some embodiments, the transmittance of the first filter region 21 to light of the same wavelength can be gradually increased from the center to the second filter region 22. In this way, the first filter region 21 can gradually increase the luminous flux of the light emitted by the light source 10 from the center to the second filter region 22, which helps to balance the uniformity of the light spot emitted by the light emitting device 100 from the center to the edge.

[0056] In some embodiments, the transmittance of the first filter region 21 to light with a wavelength of 400 nm to 450 nm may decrease as the wavelength increases. Thus, by making the transmittance of the first filter region 21 to light of different wavelengths inconsistent, it helps the first filter region 21 to better match and transmit light of different wavelengths.

[0057] In some embodiments, the transmittance of the second filter region 22 to light of the same wavelength may be consistent, that is, the transmittance of light of the same wavelength at any position in the second filter region 22 remains consistent. This helps to simplify the design of the transmittance of the second filter region 22.

[0058] In some embodiments, the transmittance of the second filter region 22 to light with a wavelength of 400nm to 450nm can be consistent, that is, the transmittance of light with a wavelength of 400nm to 450nm is consistent at any position in the second filter region 22. In this way, by making the transmittance of different wavelengths at various locations of the second filter region 22 consistent, it is helpful to simplify the design of the transmittance of the second filter region 22.

[0059] In some embodiments, the transmittance of the second filter region 22 for light of the same wavelength may gradually increase in a direction away from the first filter region 21. In this way, the second filter region 22 can gradually increase the luminous flux of the light emitted by the light source 10 from a direction away from the first filter region 21, which helps to balance the uniformity of the light spot emitted by the light emitting device 100 from the center to the edge.

[0060] In some embodiments, the transmittance of the second filter region 22 for light with a wavelength of 400 nm to 450 nm may decrease as the wavelength increases. Thus, by making the transmittance of the second filter region 22 for light of different wavelengths inconsistent, the second filter region 22 is helped to better match and transmit light of different wavelengths.

[0061] In some embodiments, the first filter area 21 may be substantially circular, and the second filter area 22 may be substantially annular. Thus, the shapes of the first filter area 21 and the second filter area 22 help match the circular light spot emitted by the light source 10, and help the first filter area 21 and the second filter area 22 to better transmit the light spot of the light source 10.

[0062] In some embodiments, the filter 20 may include a third filter region 23, the third filter region 23 is connected to the second filter region 22, and the third filter region 23 may surround the second filter region 22. For the same wavelength, the transmittance of the second filter region 22 may be less than the transmittance of the third filter region 23. In this way, the third filter region 23 increases the transmission of the light spot of the light source 10 compared with the second filter region 22, thereby facilitating the balance of the uniformity of the light spot emitted by the light emitting device 100 after passing through the third filter region 23 and the second filter region 22.

[0063] In some embodiments, the transmittance of the third filter region 23 to light of the same wavelength may be consistent, that is, the transmittance of light of the same wavelength at any position in the third filter region 23 remains consistent. This helps to simplify the design of the transmittance of the third filter region 23.

[0064] In some embodiments, the transmittance of the third filter region 23 to light with a wavelength of 400nm to 450nm may be consistent, that is, the transmittance of light with a wavelength of 400nm to 450nm is consistent at any position in the third filter region 23. In this way, by making the transmittance of different wavelengths at various locations of the third filter region 23 consistent, it is helpful to simplify the design of the transmittance of the third filter region 23.

[0065] In some embodiments, the transmittance of the third filter region 23 for light of the same wavelength may gradually increase in a direction away from the second filter region 22. In this way, the third filter region 23 can gradually increase the luminous flux of the light emitted by the light source 10 from a direction away from the second filter region 22, which helps to balance the uniformity of the light spot emitted by the light emitting device 100 from the center to the edge.

[0066] In some embodiments, the transmittance of the third filter region 23 for light with a wavelength of 400 nm to 450 nm decreases as the wavelength increases. Thus, by making the transmittance of the third filter region 23 for light of different wavelengths inconsistent, the third filter region 23 is helped to better match and transmit light of different wavelengths.

[0067] In some embodiments, the third filter region 23 may be substantially annular in shape, so that the shape of the third filter region 23 helps to match the circular light spot emitted by the light source 10 , and helps the third filter region 23 to better transmit the light spot of the light source 10 .

[0068] In some embodiments, the filter element 20 may include a fourth filter region 24, the fourth filter region 24 is connected to the third filter region 23, and the fourth filter region 24 may surround the third filter region 23. For the same wavelength, the transmittance of the third filter region 23 may be less than the transmittance of the fourth filter region 24. In this way, the fourth filter region 24 increases the transmission of the light spot of the light source 10 compared with the third filter region 23, thereby facilitating the balance of the uniformity of the light spot emitted by the light emitting device 100 after passing through the fourth filter region 24 and the third filter region 23.

[0069] In some embodiments, the transmittance of the fourth filter region 24 to light of the same wavelength may be consistent, that is, the transmittance of light of the same wavelength at any position in the fourth filter region 24 remains consistent. This helps to simplify the design of the transmittance of the fourth filter region 24.

[0070] In some embodiments, the transmittance of the fourth filter region 24 to light with a wavelength of 400 nm to 450 nm may be consistent, that is, the transmittance of light with a wavelength of 400 nm to 450 nm at any position in the fourth filter region 24 is consistent. In this way, by making the transmittance of each position of the fourth filter region 24 to different wavelengths consistent, it is helpful to simplify the design of the transmittance of the fourth filter region 24.

[0071] In some embodiments, the transmittance of the fourth filter region 24 for light of the same wavelength may gradually increase in a direction away from the third filter region 23. In this way, the fourth filter region 24 can gradually increase the luminous flux of the light emitted by the light source 10 from a direction away from the third filter region 23, which helps to balance the uniformity of the light spot emitted by the light emitting device 100 from the center to the edge.

[0072] In some embodiments, the transmittance of the fourth filter region 24 for light with a wavelength of 400 nm to 450 nm decreases as the wavelength increases. Thus, by making the transmittance of the fourth filter region 24 for light of different wavelengths inconsistent, the fourth filter region 24 is helped to better match and transmit light of different wavelengths.

[0073] In some embodiments, the fourth filter region 24 may be substantially annular in shape, so that the shape of the fourth filter region 24 helps match the circular light spot emitted by the light source 10 , and helps the fourth filter region 24 to better transmit the light spot of the light source 10 .

[0074] In some embodiments, the transmittance of the first filter region 21 to light with a wavelength of 400nm to 450nm may be 0.65 to 0.8. The transmittance of the second filter region 22 to light with a wavelength of 400nm to 450nm may be 0.65 to 0.8. The transmittance of the third filter region 23 to light with a wavelength of 400nm to 450nm may be 0.65 to 0.8. The transmittance of the fourth filter region 24 to light with a wavelength of 400nm to 450nm may be 0.65 to 0.8.

[0075] In some embodiments, the transmittance of the first filter region 21 to light with a wavelength of 400nm to 450nm can be 0.65, the transmittance of the second filter region 22 to light with a wavelength of 400nm to 450nm can be 0.7, the transmittance of the third filter region 23 to light with a wavelength of 400nm to 450nm can be 0.75, and the transmittance of the fourth filter region 24 to light with a wavelength of 400nm to 450nm can be 0.8.

[0076] In some embodiments, when the laser light emitted by the light source 10 is white light, the filter 20 can transmit some spectral components and reflect some spectral components. Figure 5 As shown, Figure 5 The value of the abscissa in is the wavelength, in nm; the value of the ordinate is the transmittance. The transmittance of the filter 20 to light with a wavelength of 400 nm to 450 nm can increase from the center to the edge.

[0077] Among them, Figure 7As shown, the transmittance of the same position of the filter 20 to the light with a wavelength of 400nm to 450nm is consistent. For example, the transmittance of the light with a wavelength of 400nm to 450nm is consistent at the center position 21 of the filter 20. For another example, the transmittance of the light with a wavelength of 400nm to 450nm is consistent at the center position 22 of the filter 20. For another example, the transmittance of the light with a wavelength of 400nm to 450nm is consistent at the edge position 23 of the filter 20. For another example, the transmittance of the light with a wavelength of 400nm to 450nm is consistent at the edge position 24 of the filter 20.

[0078] In other embodiments, the transmittance of the light with a wavelength of 400 nm to 450 nm at the same location of the optical filter 20 may also decrease as the wavelength increases.

[0079] In the light-emitting device 100 provided in the embodiment of the present invention, the light source 10 of the light-emitting device 100 is used to emit laser, and the filter 20 is located in the optical path of the laser emitted by the light source 10. The center of the filter 20 passes through the optical axis 11 of the light source 10. The transmittance of the filter 20 to light of the same wavelength increases from the center to the edge, so that the filter 20 can reduce the transmission at the center of the light spot of the light source 10, which helps to balance the uniformity of the light spot emitted by the light-emitting device 100 at the center and the edge.

[0080] See also Figure 8 An embodiment of the present invention provides a lamp 200, wherein the lamp 200 may be a stage lamp or other types of lamps.

[0081] The lamp 200 includes a housing 201 and the light emitting device 100 in any of the above embodiments. The light emitting device 100 is assembled in the housing 201 , and the housing 201 can provide a certain degree of protection for the light emitting device 100 .

[0082] In the lamp 200 provided in the embodiment of the present invention, the light source 10 of the light-emitting device 100 is used to emit laser, and the filter 20 is located in the optical path of the laser emitted by the light source 10. The center of the filter 20 passes through the optical axis 11 of the light source 10. The transmittance of the filter 20 to light of the same wavelength increases from the center to the edge, so that the filter 20 can reduce the transmission at the center of the light spot of the light source 10, which helps to balance the uniformity of the light spot emitted by the light-emitting device 100 at the center and the edge.

[0083] In the present invention, unless otherwise clearly specified or limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, it can be only surface contact, or it can be connected through surface contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as a specific or special structure. The description of the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present invention and the features of the different embodiments or examples without contradiction.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A light emitting device, characterized in that: include: A light source, the light source is used to emit light; as well as The filter is located in the optical path of the light emitted by the light source, the center of the filter passes through the optical axis of the light source, and the transmittance of the filter to light of the same wavelength increases from the center to the edge.

2. The light emitting device according to claim 1, characterized in that: The light source is a laser module, and the light emitting device further comprises a wavelength converter, which is located in the light transmission path of the filter and is used to receive the laser light transmitted through the filter and at least partially convert the laser light into converted light.

3. The light emitting device according to claim 1, characterized in that: The light source includes an excitation light module and a wavelength conversion element, wherein the wavelength conversion element is located in the optical path of the excitation light emitted by the excitation light module, and the wavelength conversion element is used to receive the excitation light emitted by the excitation light module and at least partially convert the excitation light into converted light.

4. The light emitting device according to claim 1, characterized in that: The transmittance of the filter to light of the same wavelength increases gradually from the center to the edge; or, the transmittance of the filter to light of the same wavelength increases gradually from the center to the edge.

5. The light emitting device according to claim 1, characterized in that: The filter element comprises a first filter area and a second filter area connected to each other, the center of the filter element is located in the first filter area, and the second filter area surrounds the first filter area; for the same wavelength, the transmittance of the first filter area is less than the transmittance of the second filter area.

6. The light emitting device according to claim 5, characterized in that: The transmittance of the first filter area to light of the same wavelength is consistent; or the transmittance of the first filter area to light of the same wavelength gradually increases from the center to the second filter area.

7. The light emitting device according to claim 5, characterized in that: The transmittance of the second filter area to light of the same wavelength is consistent; or the transmittance of the second filter area to light of the same wavelength gradually increases in a direction away from the first filter area.

8. The light emitting device according to claim 5, characterized in that: The first light filtering area is circular, and the second light filtering area is annular.

9. The light emitting device according to claim 1, characterized in that: The wavelength is 400nm to 450nm; Alternatively, the transmittance of the same part of the filter to light with a wavelength of 400nm to 450nm is consistent; Alternatively, the transmittance of the light with a wavelength of 400nm to 450nm at the same location of the filter decreases as the wavelength increases.

10. A lamp, characterized in that: include: case; as well as According to any one of claims 1 to 9, the light emitting device is assembled on the housing.

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