A lighting device and a lamp

Abstract

The present invention discloses a lighting device and a lamp, comprising a light source and an outgoing light beam, wherein the outgoing light beam is emitted along its optical axis at a light emission half-angle α, and is characterized in that: it also comprises a light emitting portion for emitting the outgoing light beam, wherein the light emitting portion comprises a second reflecting surface, and the light emitted by the light source comprises a first angle light and a second angle light, the second angle light is emitted toward the second reflecting surface, and is reflected by the second reflecting surface and converged to form an outgoing light beam; so that the outgoing light beam is not blocked by the light source, the second reflecting surface is arranged around the first reflecting surface, and in order to avoid wasting the light emitted by the light source, the first reflecting surface is used to reflect the light that cannot be reflected by the second reflecting surface back to the light source, and reaches the second reflecting surface after being scattered and reflected by the light source.

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] When lighting devices are used according to the requirements, such as obtaining light at a certain luminous angle or enhancing the intensity of luminous light, they are usually used in conjunction with a reflector cup. When a reflector cup is used in conjunction with a light source, it is easy for the light source to block the luminous light path of the reflector cup. Once the luminous light source blocks the luminous light path of the luminous cup, a dark area will be present in the light spot of the emitted light, resulting in a waste of light energy. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned conventional technology. The present invention provides a lighting device which can prevent a light source from blocking a light path and a lamp using the lighting device.

[0004] To solve the above problems, the technical solution adopted by the present invention is: a lighting device, including a light source and an output light beam, the output light beam is emitted along its optical axis at a light emission half-angle α, characterized in that: it also includes a light emitting portion that emits the output light beam, the light emitting portion includes a second reflecting surface, the light emitted by the light source includes a first angle light and a second angle light, the second angle light is emitted toward the second reflecting surface, and is reflected by the second reflecting surface and converged to form an output light beam; it also includes at least a part of a light recovery portion, the light recovery portion includes a first reflecting surface, the first angle light is emitted toward the first reflecting surface, and is reflected by the first reflecting surface and then returns to the light source, the light source has a scattering reflection effect on the first angle light; the light emission direction of the light emitted by the light source is opposite to the light emission direction of the output light beam.

[0005] As an improvement of the above technical solution: the second reflecting surface is a spherical surface, and the foot C of the perpendicular on the line from the center O of the second reflecting surface to the light-emitting point A of the light source and the focus B where the light beam converges is located at the midpoint of the line, and the foot C of the perpendicular is located between the center O and the second reflecting surface.

[0006] As an improvement of the above technical solution: the distance between the light emitting point A of the light source and the focus B where the light beam converges is L, the spherical radius corresponding to the second reflecting surface is R, and the distance from the center O of the second reflecting surface to the foot point C is y,

[0007] As an improvement of the above technical solution: the light source is a fluorescent light-emitting device, and also includes a laser light source that emits laser. After the laser excites the fluorescent light-emitting device, the fluorescent light-emitting device emits fluorescence.

[0008] As an improvement of the above technical solution: the fluorescent light-emitting device is a reflective fluorescent sheet, the laser light source is located on the side of the light recovery part away from the reflective fluorescent sheet, the light recovery part is provided with a light through hole, and the laser excites the reflective fluorescent sheet after passing through the light through hole.

[0009] As an improvement of the above technical solution: a first lens is arranged in the light-through hole, and a side of the first lens close to the reflective fluorescent film is a third reflective surface, and the third reflective surface is a spherical surface; a part of the first angle light is reflected by the third reflective surface and then converged and returned to the reflective fluorescent film, and the third reflective surface is coated with a coating layer that transmits laser and reflects fluorescence.

[0010] As an improvement of the above technical solution: the first reflecting surface is arranged around the second reflecting surface, and the first reflecting surface and the second reflecting surface are spliced ​​into a concave surface.

[0011] As an improvement of the above technical solution: it also includes a fixed heat sink for fixing the light source, and the fixed heat sink is fixedly arranged on the light recovery part.

[0012] As an improvement of the above technical solution: the second reflecting surface is an ellipsoidal surface, one focus corresponding to the ellipsoidal surface is the light-emitting point of the light source, and the other focus is the focus where the outgoing light beam converges.

[0013] Due to the adoption of the above-mentioned technical scheme, compared with the prior art, in the present invention, in order to prevent the outgoing light beam from being blocked by the light source, the second reflecting surface is arranged around the first reflecting surface. In order to avoid wasting the light emitted by the light source, the first reflecting surface is used to reflect the light that cannot be reflected by the second reflecting surface back to the light source, and reaches the second reflecting surface after scattering and reflection by the light source.

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of a lighting device.

[0016] Figure 2 A cross-sectional view of a lighting device.

[0017] Figure 3 A cross-sectional view of a lighting device.

[0018] Figure 4 A cross-sectional view of a lighting device. DETAILED DESCRIPTION

[0019] Embodiment 1:

[0020] like Figure 1As shown, a lighting device includes a light source 101 and an outgoing light beam 121, the outgoing light beam 123 of the lighting device is emitted along its optical axis 131 at a light emission half-angle α, and also includes a light emitting portion 102 that emits the outgoing light beam 121, the light emitting portion 102 includes a second reflecting surface 103, the light emitted by the light source 101 includes a first angle light 121 and a second angle light 122, the second angle light 122 is emitted toward the second reflecting surface 103, and the second angle light 122 reflected by the second reflecting surface 103 converges to form the outgoing light beam 123; also includes at least a portion of a light recovery portion 104, the light recovery portion 104 includes a first reflecting surface 105, the first angle light 121 is emitted toward the first reflecting surface 105, the first angle light 121 reflected by the first reflecting surface 105 is reflected back to the light source 101, and the light source 101 has a scattering and reflecting effect on the first angle light 121; the light emission direction of the light emitted by the light source is opposite to the light emission direction of the outgoing light beam.

[0021] According to the use requirements of the lighting device, an outgoing light beam 123 with a light emission half angle of α is required. In order to meet the use requirements, the light source is directed to a second reflective surface 103 that can emit light with a light emission half angle of α, and the light reflected by the second reflective surface 103 forms an outgoing light beam 123. According to whether the light emitted by the light source can be reflected by the second reflective surface 103, it is divided into a first angle light 121 and a second angle light 122. The light that cannot be reflected by the second reflective surface 103 is the first angle light 121, and the light that can be reflected by the second reflective surface 103 is the second angle light 122. Since the first angle light 121 cannot be reflected by the second reflective surface 103, the first angle light 121 is not a component of the outgoing light beam 123 at this time. If the light emitted by the light source 101 cannot be completely converted into the outgoing light beam 123, the utilization rate of the light source 101 is low. In order to improve the utilization rate of the light emitted by the light source 101, a first reflecting surface 105 is set within the light-emitting range of the first angle light 121. The first reflecting surface 105 reflects the first angle light 121 back to the light source 101. The light source 101 includes a light-emitting surface, and the light-emitting surface scatters and reflects the first angle light 121. Therefore, after the first angle light 121 reflected back to the light-emitting surface by the first reflecting surface 105 is scattered and reflected by the light-emitting surface, a part of the first angle light 121 is converted into second angle light 122, thereby improving the utilization rate of the light emitted by the light source 101.

[0022] In order to fully improve the utilization rate of the light emitted by the light source 101, a preferred embodiment is that the first reflecting surface 105 and the second reflecting surface 103 are spliced ​​into a concave surface. After the first reflecting surface 105 and the second reflecting surface 103 are spliced ​​into a concave surface, it is avoided that the first angle light 121 and the second angle light 122 are emitted from between the first reflecting surface 105 and the second reflecting surface 103, and the light emitted by the light source 101 cannot be fully utilized, resulting in a low utilization rate of the light emitted by the light source 101.

[0023] Because the outgoing light beam 123 is formed after the second angle light 122 is reflected by the second reflection surface 103, in order to ensure the integrity of the light spot of the outgoing light beam 123 and ensure that the light emitted by the light source 101 can fill the second reflection surface 103, a preferred embodiment is that the first reflection surface 105 is arranged around the second reflection surface 103. The second reflection surface 103 is surrounded by the first reflection surface 105, and at this time, enough second angle light 122 is reflected by the second reflection surface 103, and there is no dark area in the light spot formed by the outgoing light beam 123.

[0024] The emission half angle α of the light beam 123 also needs to be within a reasonable range to avoid being blocked by the light source 101 and facilitate the collection of the light beam 123. The 10°≤α≤60°. When the emission half angle α of the light beam 123 is within this angle range, it will not be blocked by the light source 101, and secondly, it is more conducive to using a lens to collect light.

[0025] Due to the requirements of the emission position and the light-emitting angle of the light beam 123, in the light-emitting device, there is a positional relationship between the spherical center O corresponding to the second reflecting surface 103, the light-emitting point A of the light source 101 and the focal point B where the light beam 123 converges. The second reflecting surface is a spherical surface, and the foot C of the perpendicular on the line from the spherical center O of the second reflecting surface 103 to the light-emitting point A of the light source and the focal point B where the light beam converges is located at the midpoint D of the line, and the foot C of the perpendicular is located between the spherical center O and the second reflecting surface. According to the positional relationship, when the light-emitting point A of the light source 101 and the focal point B where the light beam 123 converges are between the second reflecting surface 103 and the spherical center O corresponding to the second reflecting surface 103, the convergence focal point B formed by the light-emitting point A of the light source 101 after being reflected by the second reflecting surface 103 is more ideal. There are two perpendicular feet C on the line connecting the center O of the second reflecting surface 103 to the light-emitting point A of the light source and the focus B where the light beam converges, which satisfy the requirement that the foot C is located at the midpoint D of the line. This technical solution selects the one where the foot C is located between the center O and the second reflecting surface.

[0026] In order to apply this distance relationship in actual production, the applicant obtained a distance relationship between the sphere center O corresponding to the second reflective surface 103 and the line L connecting the light emitting point A of the light source and the focus B where the light beam converges after many experiments.

[0027] The distance between the light-emitting point A of the light source and the focus B where the light beam converges is L, the spherical radius corresponding to the second reflecting surface is R, and the distance between the spherical center O of the second reflecting surface and the light-emitting point A of the light source and the focus B where the light beam converges is y. When y, R and L satisfy the above formula, the convergence focus B formed by the light emitting point A of the light source 101 after being reflected by the second reflection surface 103 is more ideal.

[0028] The luminous light source 101 provides light for the entire device, and the light source 101 has the ability to scatter and reflect the light emitted by itself. A preferred embodiment is that the light source 101 is an LED light emitting chip. The LED light emitting chip is low in price, easy to obtain, and easy to install and use.

[0029] Since the light source 101 needs to emit light toward the first reflecting surface 105 and the second reflecting surface 103, the light source 101 needs to be fixed. A preferred embodiment is to further include a fixed heat sink 106 for fixing the light source 101, and the fixed heat sink 106 is fixedly arranged on the light recovery unit 104. Since the light source 101 is an LED light-emitting chip, the LED light-emitting chip can be fixed on the fixed heat sink 106 by bonding or the like, and the installation accuracy of the LED light-emitting chip is higher at this time. Secondly, the fixed heat sink 106 can also be used to dissipate heat for the light source 101 to avoid damage to the light source 101 or shortening of its life due to excessive temperature.

[0030] Example 2

[0031] like Figure 2As shown, LED light-emitting chips are used as light sources, which are low in cost, easy to obtain, and convenient to use and install. However, LED light-emitting chips are affected by their own power. In high-power lighting, the power of lighting is increased by increasing the number of LED light-emitting chips. Since LED light-emitting chips need to occupy a certain area, the more LED light-emitting chips there are, the larger the area of ​​the light point will be, which affects the light-emitting angle and light spot of our light beam. Therefore, there are many problems with LED light-emitting chips in high-power lighting. In order to solve the problem of high-power lighting, a preferred embodiment is that the light source is a fluorescent light-emitting device, and also includes a laser light source 210 that emits laser. After the laser 224 excites the fluorescent light-emitting device, the fluorescent light-emitting device emits fluorescence. The fluorescent light-emitting device is a reflective fluorescent sheet 201, and the laser light source 210 is located on the side of the light recovery part 204 away from the reflective fluorescent sheet 201. The light recovery part 204 is provided with a light-through hole 207. The laser 224 passes through the light-through hole 207 and excites the reflective fluorescent sheet 201. The stimulated light emitted by the reflective fluorescent sheet 201 is full-angle luminous and can scatter and reflect the light emitted by itself. Therefore, the present technical solution uses the reflective fluorescent sheet 201 to replace the LED light-emitting chip and is applied to high-power and long-distance lighting. The stimulated light emitted by the reflective fluorescent sheet 201 is divided into the first angle light 221 and the second angle light 222 according to requirements. Since the fluorescent light-emitting device is a reflective fluorescent sheet 201, and the reflective fluorescent sheet 201 emits light toward the first reflection surface 205 and the second reflection surface 203, the laser 224 is required to excite the reflective fluorescent sheet 201 and not block the first angle light 221 and the second angle light 222 emitted by the reflective fluorescent sheet 201. Therefore, the laser light source 210 is located on the side of the light recovery part 204 away from the reflective fluorescent sheet 201, and a light through hole 207 is provided in the light recovery part 204. The laser 224 excites the reflective fluorescent sheet 201 after passing through the light through hole 207. Since the laser 224 is collimated, the beam size of the laser 224 passing through the light-transmitting hole 207 is small, and the size of the light-transmitting hole 207 is very small, and the influence on the first angle light 221 can be ignored.

[0032] The second angle light 222 emitted by the second reflecting surface 203 forms an outgoing light beam 223 with a luminous half angle of α, so the surface shape of the second reflecting surface 203 determines the luminous angle of the outgoing light beam 223. According to the demand, a preferred implementation is that the second reflecting surface 203 is an ellipsoidal surface, one focus corresponding to the ellipsoidal surface is the luminous point of the light source, and the other focus is the focus where the outgoing light beam converges. According to the geometric characteristics of the ellipsoid, any straight line from one focus of the ellipsoid will return to the other focus of the ellipsoid after being reflected by the spherical surface of the ellipsoid. It can still be applied when the second reflecting surface 203 is an ellipsoidal surface.

[0033] Example 3

[0034] Although the light hole 307 is very small and has a negligible effect on the first angle light 321, a portion of the first angle light 321 will still be emitted from the light hole 307. In order to reduce the first angle light 321 emitted from the light hole 307, the following technical solution is disclosed.

[0035] like Figure 3 As shown, a first lens 308 is arranged in the light hole 307, and the side of the first lens 308 close to the reflective fluorescent sheet 301 is a third reflective surface 311, and the third reflective surface 311 is a spherical surface; a part of the first angle light 321 is reflected by the third reflective surface 311 and converges, and returns to the reflective fluorescent sheet 301, and the third reflective surface 301 is coated with a coating layer that transmits the laser 324 and reflects the fluorescence. A first lens 308 is arranged in the light hole 307, and the side of the first lens 308 close to the reflective fluorescent sheet 301 is a spherical surface, and the spherical surface recycles the fluorescence, and the part of the first angle light 321 emitted by the reflective fluorescent sheet 301 that is irradiated on the spherical surface of the first lens 308 is reflected back to the reflective fluorescent sheet 301. If this goal is to be achieved, it is necessary to be able to transmit the laser 224 and reflect the fluorescence, so a coating layer that transmits the laser 324 and reflects the fluorescence is coated on the first lens 308. Since the third reflective surface 311 and the first reflective surface 305 are both used to recycle the fluorescence emitted by the reflective fluorescent sheet 301, the sphere centers corresponding to the first reflective surface 305 and the third reflective surface 311 need to coincide, and the spherical radii corresponding to the first reflective surface 305 and the third reflective surface 311 may be different. A preferred method is that the spherical radius of the third reflective surface 311 is the same as the spherical radius of the first reflective surface 305. The spherical radii corresponding to the first reflective surface 305 and the third reflective surface 311 are the same. At this time, the first reflective surface 305 and the third reflective surface 311 are spliced ​​into one body, and the fluorescence recycling effect is better. The first lens 308 can be fixed in the light hole 307 or in the notch corresponding to the light hole 307 by bonding.

[0036] Due to the use of the reflective fluorescent film 301, the luminous power of the entire device is improved, and the corresponding heat dissipation requirements are higher. In order to solve the heat dissipation problem of the entire device, a preferred implementation method is to fix the heat sink 306 on the light recovery part 304 and seal the opening of the light recovery part 304. A light outlet 313 is opened on the fixed heat sink 306, and the light beam 323 is emitted from the light outlet 313.

[0037] Example 4

[0038] The fluorescent light-emitting device includes a reflective fluorescent light-emitting sheet and a transmissive fluorescent sheet. The above-mentioned embodiment adopts a reflective fluorescent sheet. Due to the light-emitting characteristics of the reflective fluorescent sheet and the characteristics of the present technical solution, the use of the reflective fluorescent sheet requires the use of a light-through hole, etc., which increases the technical difficulty and processing cost.

[0039] like Figure 4 As shown, in order to solve the above problems, a preferred implementation is that the light source is a transmissive fluorescent sheet 401, and the laser light source 410 used to excite the transmissive fluorescent sheet 401 is arranged on the side of the transmissive fluorescent sheet 401 away from the light recovery unit 404. After the laser 424 emitted by the laser light source 410 excites the transmissive fluorescent sheet 401, the transmissive fluorescent sheet 401 emits fluorescence toward the first reflection surface 405 and the second reflection surface 403. In this implementation, the fluorescent light emitting device uses a transmissive fluorescent sheet 401. According to this implementation, the role of the transmissive fluorescent sheet 401 is equivalent to the light source in Example 1. The laser light source 410 is fixedly arranged on the fixed heat sink 406, and the fixed heat sink 406 is fixedly arranged on the light recovery unit 204. In this technical solution, there is no need to open a light hole on the light recovery unit 404, which reduces the difficulty of processing, does not affect light recovery, avoids the waste of fluorescence, and improves the utilization rate of light.

[0040] 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. A lighting device, comprising a light source and an output light beam, wherein the output light beam is emitted along its optical axis at a light emission half angle α, characterized in that: It also includes a light emitting portion for emitting an outgoing light beam, the light emitting portion includes a second reflecting surface, the light emitted by the light source includes a first angle light and a second angle light, the second angle light is emitted toward the second reflecting surface, and is reflected by the second reflecting surface and converges to form an outgoing light beam; it also includes at least a part of a light recovery portion, the light recovery portion includes a first reflecting surface, the first angle light is emitted toward the first reflecting surface, and is reflected by the first reflecting surface and returns to the light source, and the light source has a scattering and reflecting effect on the first angle light; the emitting direction of the light emitted by the light source is opposite to the emitting direction of the outgoing light beam; the first reflecting surface is arranged around the second reflecting surface, and the first reflecting surface and the second reflecting surface are spliced ​​into a concave surface; the second reflecting surface is a spherical surface, and the foot C of the perpendicular on the line from the center O of the second reflecting surface to the light emitting point A of the light source and the focus B where the outgoing light beam converges is located at the midpoint of the line, and the foot C is located between the center O and the second reflecting surface; the distance between the light emitting point A of the light source and the focus B where the outgoing light beam converges is L, the spherical radius corresponding to the second reflecting surface is R, and the distance from the center O of the second reflecting surface to the foot C point is y, 2. A lighting device according to claim 1, characterized in that: The light source is a fluorescent light-emitting device, and also includes a laser light source that emits laser. After the laser excites the fluorescent light-emitting device, the fluorescent light-emitting device emits fluorescence.

3. A lighting device according to claim 2, characterized in that: The fluorescent light emitting device is a reflective fluorescent sheet. The laser light source is located on a side of the light recovery part away from the reflective fluorescent sheet. The light recovery part is provided with a light through hole. The laser excites the reflective fluorescent sheet after passing through the light through hole.

4. A lighting device according to claim 3, characterized in that: A first lens is arranged in the light-through hole, and a side of the first lens close to the reflective fluorescent sheet is a third reflective surface, and the third reflective surface is a spherical surface; a portion of the first angle light is reflected by the third reflective surface and then converged and returned to the reflective fluorescent sheet, and the third reflective surface is coated with a coating layer that transmits laser and reflects fluorescence.

5. The lighting device according to claim 1, characterized in that: It also includes a fixed heat dissipation plate for fixing the light source, and the fixed heat dissipation plate is fixedly arranged on the light recovery part.

6. The lighting device according to claim 1, characterized in that: The second reflecting surface is an ellipsoidal surface, one focus of the ellipsoidal surface is the light-emitting point of the light source, and the other focus is the focus where the outgoing light beam converges.

7. A lamp, characterized in that: A lighting device comprising any one of claims 1-6.

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