A lighting device and a lamp

Abstract

The present invention discloses a lighting device and a lamp, comprising a laser light source for emitting laser and a reflective fluorescent sheet excited by the laser, wherein the reflective fluorescent sheet is excited by the laser to emit stimulated light, wherein the stimulated light comprises a first angle light located at the center and a second angle light surrounding the first angle light, and wherein the laser light source and the reflective fluorescent sheet have the same light emission direction, and further comprises a laser redirecting device for guiding the laser to the reflective fluorescent sheet; the present invention recycles the first angle light through a light recycling surface and reuses it, thereby reducing stray light in the emitted light and will not affect the luminous intensity of the lighting device.

Description

Technical Field

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

[0002] Most of the existing lighting devices are used in conjunction with a reflector cup / lampshade to direct the light emitted by the lighting device toward a certain angle or direction. The purpose of using a reflector / lampshade in conjunction with a lighting device is to focus or shape the divergent light emitted by the lighting device. Since the light-emitting end of the reflector / lampshade is open, the small-angle light emitted by the lighting device cannot be focused or shaped by the reflector / lampshade. After the small-angle light emitted by the lighting device is emitted, the far-field light spot is uneven or the light spot shape is irregular, affecting the lighting effect of the far-field light spot. If the small-angle light emitted by the lighting device is blocked, the problems of uneven far-field light spot and irregular light spot shape are solved, but the problem of reduced light intensity of the lighting device is caused. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned traditional technology. The present invention provides a lighting device for recycling small-angle light emitted by a light-emitting device.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: an illumination device, comprising a laser light source for emitting laser and a reflective fluorescent sheet excited by the laser, the reflective fluorescent sheet is excited by the laser to emit stimulated light, the stimulated light comprises a first angle light located at the center and a second angle light surrounding the first angle light, characterized in that: the light emission direction of the laser light source is the same as that of the reflective fluorescent sheet, and further comprising a laser redirection device for guiding the laser to the reflective fluorescent sheet;

[0005] It also includes a light recycling unit, the light recycling unit includes a concave reflecting surface, the reflecting surface is a spherical surface, the reflective fluorescent sheet emits light toward the reflecting surface, and the reflecting surface reflects the first angle light back to the stimulated light-emitting point of the reflective fluorescent sheet;

[0006] It also includes a reflective cup for reflecting the second angle light, wherein the second angle light reflected by the reflective cup forms the emergent light;

[0007] The emission direction of the emitted light is the same as the emission direction of the reflective fluorescent sheet.

[0008] As an improvement of the above technical solution: the radius of the reflecting surface is R, the center of the spherical reflector is O, the diameter of the circumscribed circle of the reflective fluorescent sheet is L, the foot of the perpendicular from the center O to the reflective fluorescent sheet is located at the center of the reflective fluorescent sheet, the reflective fluorescent sheet is located between the center O and the reflecting surface, the distance from the geometric center C of the luminous surface to the center O is y, and the

[0009] As an improvement of the above technical solution: it also includes a channel, which is arranged between the reflective cup and the reflective fluorescent sheet. The laser reaches the laser redirecting device after passing through the channel.

[0010] As an improvement of the above technical solution: the reflective cup includes a second reflective surface that reflects light at a second angle, and the second reflective surface is a parabola or an ellipsoid.

[0011] As an improvement of the above technical solution: the laser redirecting device is a reflector, and the reflector is arranged within the coverage range of the first angle light.

[0012] As an improvement of the above technical solution: the reflector is arranged between the reflective fluorescent sheet and the light recycling surface.

[0013] As an improvement of the above technical solution: the reflector is fixedly arranged above the light recovery part.

[0014] As an improvement of the above technical solution: a second hole is provided on the light recovery part, and a reflector is provided on a side of the light recovery part away from the reflective fluorescent film. The laser passes through the second hole and reaches the reflector. The laser is reflected by the reflector and passes through the second hole and excites the reflective fluorescent film.

[0015] As an improvement of the above technical solution: the luminous half-angle range of the first angle light is α, α is greater than 0° and less than or equal to 45°, and the luminous half-angle range of the second angle light is β, and β is greater than α and less than or equal to 90°.

[0016] Due to the adoption of the above technical solution, compared with the prior art, the present invention recycles and reuses the first angle light through the light recycling surface, reduces stray light in the emergent light, and does not affect the luminous intensity of the lighting device.

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A cross-sectional view of a lighting device.

[0019] Figure 2 A cross-sectional view of a lighting device.

[0020] Figure 3 A cross-sectional view of a lighting device.

[0021] Figure 4 A cross-sectional view of a lighting device. DETAILED DESCRIPTION

[0022] Embodiment 1:

[0023] like Figure 1As shown, a lighting device includes a laser light source 101 that emits laser light 121 and a reflective fluorescent sheet 102 that is excited by the laser light 121. The reflective fluorescent sheet 102 is excited by the laser light 121 to emit stimulated light, and the stimulated light includes a first angle light 122 located at the center and a second angle light 123 surrounding the first angle light 122. The laser light source 101 and the reflective fluorescent sheet 102 have the same light emission direction, and also includes a laser redirecting device that guides the laser light 121 to the reflective fluorescent sheet 102.

[0024] It also includes a light recovery part 103, which includes a concave reflecting surface 104, and the reflecting surface 104 is a spherical surface. The reflective fluorescent sheet 102 emits light toward the reflecting surface 104, and the reflecting surface 104 reflects the first angle light 122 back to the stimulated light point 131 of the reflective fluorescent sheet 102; it also includes a reflective cup 105 that reflects the second angle light 123, and the second angle light 123 reflected by the reflective cup 105 forms an outgoing light 124.

[0025] The light emitted by the lighting device is the converted light generated by the laser light source 101 exciting the fluorescent sheet. Since the present technical solution uses the reflective fluorescent sheet 102, according to the light-emitting characteristics of the emitting fluorescent sheet 102, the laser light 121 and the fluorescence emitted by the reflective fluorescent sheet 102 are both on the same side of the reflective fluorescent sheet 102. The laser light source 101 emits the laser light 121 toward the reflective fluorescent sheet 102, and the laser light 121 excites the reflective fluorescent sheet 102 and then emits the converted light. Since the converted light emitted by the reflective fluorescent sheet 102 is full-angle emitting, the laser light source 101 will certainly block part of the converted light. In order to reduce the blocking of the converted light by the laser light source 101, in the present technical solution, the laser light source 101 is located on the side opposite to the converted light emitted by the reflective fluorescent sheet 102, and the laser light source 101 and the reflective fluorescent sheet 102 have the same light emission direction. Since the laser light source 101 and the reflective fluorescent sheet 102 emit light in the same direction, a laser redirecting device is required to reverse the direction of the laser light 121 emitted by the laser light source 101 and guide the laser light 121 to the reflective fluorescent sheet 102 .

[0026] According to several existing reflective cups 105, one type of reflective cup 105 forms the outgoing light 124 in the opposite direction of the light emitted by the light-emitting device, and another type of reflective cup 105 forms the outgoing light 124 in the same direction as the light emitted by the light-emitting device. Since when the reflective cup 105 forms the outgoing light 124 in the opposite direction of the light emitted by the light-emitting device, the outgoing light 124 will be blocked by the light-emitting device, which does not meet the use requirements. A preferred embodiment is that the emission direction of the outgoing light 124 is the same as the direction in which the reflective fluorescent sheet 102 is stimulated to emit light. When the outgoing light 124 is in the same direction as the light emitted by the reflective fluorescent sheet 102, the outgoing light 124 will not be blocked by the reflective fluorescent sheet 102, and the lighting effect of the outgoing light 124 is better. Since the exit light 124 collected and shaped by the reflective cup 105 has the same direction as the stimulated light of the reflective fluorescent sheet 102, the reflective cup 105 collects and shapes the light with a larger luminous angle in the stimulated light to form an exit light that meets the use requirements, and cannot collect the light with a smaller luminous angle in the stimulated light during use. In this technical solution, the stimulated light is first divided into the first angle light 122 that cannot be collected and shaped by the reflective cup 105 and the second angle light 123 that is collected and shaped by the reflective cup 105 to form the exit light 124 according to the different luminous angles of the stimulated light. Since the first angle light 122 cannot be collected and shaped by the reflective cup 105, the first angle light 122 does not meet the use requirements, and the first angle light 122 affects the spot shape of the exit light after it is emitted. By setting a light recovery unit 103 on the exit light path of the first angle light 122, the first angle light 122 is prevented from entering the exit light 124 and affecting the spot and lighting effect of the exit light 124. Furthermore, because the reflective surface 104 is a spherical surface, the first angle light 122 is reflected by the reflective surface 104 and then returned to the reflective fluorescent sheet 102 .

[0027] According to optical knowledge, a beam of light emitted at the center of a spherical surface will return to the center of the spherical surface after being reflected by the spherical surface. In the present technical solution, it is the reflective fluorescent sheet 102 that emits light, not the theoretical light-emitting point. A preferred implementation is that the radius of the reflective surface 104 is R, the center of the spherical reflector is O, the diameter of the circumscribed circle of the reflective fluorescent sheet 102 is L, the foot of the perpendicular from the center O to the reflective fluorescent sheet 102 is located at the center of the reflective fluorescent sheet 102, the reflective fluorescent sheet 102 is located between the center O and the reflective surface 104, the distance from the geometric center C of the light-emitting surface 104 to the center O is y, and the According to the conclusion obtained from many experiments, when the reflective fluorescent sheet 102 is located between the reflective surface 104 and the sphere center corresponding to the reflective surface 104 and when the value of y is within the range calculated by the above formula, the light spot formed on the reflective fluorescent sheet 102 by the first angle light 122 reflected by the reflective surface 104 can be closer to the stimulated light point 131. Therefore, it is the best choice for the reflective fluorescent sheet 102 to be located between the reflective surface 104 and the sphere center corresponding to the reflective surface 104.

[0028] The larger the area of ​​the light-emitting region of the first angle light 122, the more obvious dark areas will appear in the near-field spot of the outgoing light 124. If the area of ​​the light-emitting region of the first angle light 122 is too small, the design size of the reflective cup 105 will be too large, which is inconvenient to use. Therefore, the light-emitting angles of the first angle light 122 and the second angle light 123 need to have a suitable range. A preferred embodiment is that the light-emitting half-angle range of the first angle light is α, α is greater than 0° and less than or equal to 45°, and the light-emitting half-angle range of the second angle light is β, and β is greater than α and less than or equal to 90°. The light-emitting half-angle range α of the first angle light 122 is between 0° and 45°, which effectively reduces the design size of the reflective cup 105, and no obvious dark areas will be seen in the light spot of the outgoing light 124. The light-emitting half-angle range β of the second angle light is between α and 90°, which ensures that more second angle light 123 is reflected by the reflective cup 105 to form the outgoing light 124, thereby ensuring the light intensity of the outgoing light 124. This avoids the existence of unusable light between the first angle light 122 and the second angle light 123 , thereby improving the utilization rate of the light emitted by the light source 101 .

[0029] Since the converted light emitted by the reflective fluorescent sheet 102 is full-angle luminous, in order to avoid the laser light source 101 blocking the converted light, the laser light source 101 is arranged on the non-luminous side of the reflective fluorescent sheet 102. At this time, a path is required for the laser light 121 emitted by the laser light source 101 to reach the laser deformation device. A preferred embodiment is to further include a channel 106, wherein the channel 106 is arranged between the reflective cup 105 and the reflective fluorescent sheet 102, and the laser light reaches the laser redirection device after passing through the channel 106. The channel 106 is the path for the laser light 121 to reach the laser deformation device. The channel 106 is located between the reflective cup 105 and the reflective fluorescent sheet 102, shortening the optical path of the laser light 121 to reach the laser deformation device and reducing the volume of the entire device.

[0030] According to the lighting requirements, the outgoing light 124 is shaped into the required parallel light or focused light through the reflective cup 105. In a preferred embodiment, the reflective cup 105 includes a second reflecting surface 107 that reflects the second angle light 123, and the second reflecting surface 107 is a parabola. The second angle light 123 reflected by the second reflecting surface 107 composed of a parabola forms an outgoing light 124 that is emitted in parallel.

[0031] From the above description, it can be known that the laser redirection device needs to reverse the emission direction of the laser 121 and guide the laser 121 to the reflective fluorescent sheet 102. The laser redirection device also needs to block the second angle light 123 as little as possible to avoid affecting the light intensity or spot shape of the outgoing light 124. A preferred embodiment is that the laser redirection device has a reflector 108, and the reflector 108 is set within the coverage range of the first angle light 122. When twisting the laser 121, the reflector 108 is the simplest structure, and the cost is low and the installation is convenient, so the reflector 108 is selected at this time. The laser redirection device can also be composed of multiple reflectors or a transparent light-guiding medium such as glass, and the direction of the laser 121 is twisted by the principle of refraction when the laser 121 enters the transparent light-guiding medium. Since the above technical solution belongs to a conventional method known to those skilled in the art, it will not be introduced in this patent. In order not to affect the outgoing light 124, the position of the reflector 108 is set within the coverage range of the first angle light 122.

[0032] According to the above description, it is necessary to minimize the shielding of the second angle light 123 by the reflector 108, and set the reflector 108 within the coverage range of the first angle light 122, but the above technical solution does not describe the specific fixed position of the reflector 108. A preferred implementation is that a first hole 109 is provided on the light recovery part 103, and the reflector 108 is provided on the side of the light recovery part 103 away from the reflective fluorescent sheet 102. The laser 121 passes through the first hole 109 and reaches the reflector 108. The laser 121 is reflected by the reflector 108 and passes through the first hole 109 and excites the reflective fluorescent sheet 102. The reflector 108 is fixedly set in the first hole 109. At this time, the first hole 109 is a channel for the laser to reach the reflector 108, and the reflector 108 is also fixed.

[0033] Example 2

[0034] When the lighting device is used, in some cases, the emitted light 124 needs to be parallel light, and sometimes the emitted light 124 needs to be focused. Figure 2 As shown, a lighting device, the reflective cup 205 includes a second reflective surface 207 that reflects the second angle light 223, and the second reflective surface 207 is an ellipsoidal surface. The ellipsoidal surface corresponds to the centers of two ellipsoids, one center of the ellipsoid coincides with the stimulated light point 231, and the other center is the focusing point 232, and the outgoing light 224 converges at the focusing point 232. At this time, the outgoing light 224 is a converged light beam, which meets the application of different occasions.

[0035] Example 3

[0036] The above embodiment provides a way to fix the reflector in the first hole. In fact, the position of the reflector can be fixed not only in the first hole. Figure 3 and Figure 4 As shown in a preferred embodiment, the reflector 308 is disposed between the reflective fluorescent sheet 302 and the light recycling surface 304. The reflector 308 is fixed to the light recycling surface 304 by bonding. In this case, the first hole 309 does not need to be opened, which saves processing steps and costs.

[0037] The reflector 308 may also be positioned above the light recycling unit 303, such as Figure 4 As shown, the reflector 308 is fixedly arranged above the light recycling part 303. The light recycling part 303 is provided with a first hole 309, and the reflector 308 is arranged on a side of the light recycling part 303 away from the reflective fluorescent sheet 302. The laser 321 passes through the first hole 309 and reaches the reflector 308. The laser 321 is reflected by the reflector 308 and passes through the first hole 309 and excites the reflective fluorescent sheet 302.

[0038] The above describes several embodiments of the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should fall within the scope of the patent coverage of the present invention.

Claims

1. An illumination device, comprising a laser light source for emitting laser light and a reflective fluorescent sheet excited by the laser, wherein the reflective fluorescent sheet is excited by the laser to emit stimulated light, wherein the stimulated light comprises a first angle light at the center and a second angle light surrounding the first angle light, characterized in that: The laser light source and the reflective fluorescent sheet have the same light emission direction, and also include a laser redirection device for guiding the laser to the reflective fluorescent sheet; It also includes a light recycling unit, the light recycling unit includes a concave reflecting surface, the reflecting surface is a spherical surface, the reflective fluorescent sheet emits light toward the reflecting surface, and the reflecting surface reflects the first angle light back to the stimulated light-emitting point of the reflective fluorescent sheet; It also includes a reflective cup for reflecting the second angle light, and the second angle light reflected by the reflective cup forms an emergent light; the emitting direction of the emergent light is the same as the emitting direction of the reflective fluorescent sheet.

2. A lighting device according to claim 1, characterized in that: The radius of the reflective surface is R, the center of the spherical reflector is O, the diameter of the circumscribed circle of the reflective fluorescent sheet is L, the foot of the perpendicular from the center O to the reflective fluorescent sheet is located at the center of the reflective fluorescent sheet, the reflective fluorescent sheet is located between the center O and the reflective surface, the distance from the geometric center C of the luminous surface to the center O is y, 3. A lighting device according to claim 2, characterized in that: It also includes a channel, which is arranged around the reflective fluorescent sheet. The laser reaches the laser redirecting device after passing through the channel.

4. A lighting device according to claim 2, characterized in that: The reflective cup comprises a second reflective surface for reflecting light at a second angle, and the second reflective surface is a parabola or an ellipsoid.

5. The lighting device according to claim 1, characterized in that: The laser redirecting device is a reflector, and the reflector is arranged within the coverage range of the first angle light.

6. A lighting device according to claim 5, characterized in that: The reflector is arranged between the reflective fluorescent sheet and the light recycling surface.

7. The lighting device according to claim 5, characterized in that: The reflector is fixedly arranged above the light recovery part.

8. The lighting device according to claim 5, characterized in that: The light recycling part is provided with a second hole, and the reflector is provided on a side of the light recycling part away from the reflective fluorescent sheet. The laser reaches the reflector after passing through the second hole. The laser passes through the second hole and excites the reflective fluorescent sheet after being reflected by the reflector.

9. The lighting device according to claim 1, characterized in that: The emission half-angle range of the first angle light is α, which is greater than 0° and less than or equal to 45°. The emission half-angle range of the second angle light is β, which is greater than α and less than or equal to 90°.

10. A lamp, characterized in that: A lighting device comprising any one of claims 1 to 9.

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