CN114135803A - Laser light-emitting device and lamp - Google Patents

Laser light-emitting device and lamp Download PDF

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Publication number
CN114135803A
CN114135803A CN202010983077.0A CN202010983077A CN114135803A CN 114135803 A CN114135803 A CN 114135803A CN 202010983077 A CN202010983077 A CN 202010983077A CN 114135803 A CN114135803 A CN 114135803A
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China
Prior art keywords
laser
light
fluorescent
emitting device
positioning
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Pending
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CN202010983077.0A
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Chinese (zh)
Inventor
杨毅
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Shanghai Blue Lake Lighting Tech Co ltd
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Shanghai Blue Lake Lighting Tech Co ltd
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Publication of CN114135803A publication Critical patent/CN114135803A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/65—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/38—Combination of two or more photoluminescent elements of different materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers

Abstract

The invention discloses a laser light-emitting device, which comprises a laser diode for emitting laser and a spot shaping device, wherein the laser comprises a fast axis and a slow axis, the plane of the fast axis is vertical to the plane of the slow axis, the light-emitting angle of the fast axis is L1, the light-emitting angle of the slow axis is L2, L1/L2 is a, a laser excites a fluorescent sheet to emit fluorescence, the length of a fluorescent spot in the plane of the fast axis of the laser is L3, the length of the fluorescent spot in the plane of the slow axis is L3, L3 is larger than or equal to L4, and L3/L4 is smaller than a. The laser emitted by the laser diode is shaped by the spot shaping device, and the laser spot reaching the surface of the first substrate is enlarged, so that the phenomenon that the energy density per unit area of the fluorescent sheet irradiated by the laser is too high and exceeds the capability of the fluorescent material for converting the laser is avoided, and the phenomenon that the fluorescent sheet is damaged due to too high local temperature in the process of converting the fluorescence by the fluorescent sheet is also avoided.

Description

Laser light-emitting device and lamp
Technical Field
The invention relates to the technical field of illumination, in particular to a color temperature controllable laser light-emitting device and a lamp using the laser light-emitting device to emit light.
Background
The application of laser to illumination and display belongs to the emerging industry, and in the illumination field, the illumination technology represented by white laser has the advantages of high efficiency, energy conservation, super long service life, environmental protection, safety, reliability and the like, and becomes the main light source in the illumination field at present. The principle of white laser illumination is that a laser generator (e.g., a laser diode) emits laser light, the laser light excites a fluorescent material to emit excitation light, and the excitation light and mixed light emitted from the laser light for exciting the fluorescent material are synthesized into white light required for illumination.
Because the laser collimation nature that laser generator sent is strong, and the facula is little so the ability density in the laser unit area that laser generator sent is very high, when this laser is direct to be used for arousing the fluorescence piece, the laser energy density that bears in the fluorescence piece unit area is high, has surpassed the conversion ability of fluorescence piece. Because, the laser arouses the fluorescence piece and produces the in-process that arouses and have heat production, and the energy density in the laser unit area is too high leads to the fact local high temperature easily, influences the life of fluorescence piece.
Disclosure of Invention
The invention aims to overcome the defects of the traditional technology and provides the light-emitting device which can protect the fluorescent sheet, improve the conversion rate of the excitation light of the laser light-emitting device and prolong the service life of the laser light-emitting device.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a laser light emitting device characterized in that: the laser diode comprises a tube shell, light outlet glass is arranged at one end of the tube shell, laser is emitted from the light outlet glass, the light outlet glass is inwards concave towards the tube shell to form a groove, a fluorescent sheet comprises a transparent and heat-conducting first substrate and a fluorescent material arranged on the surface of the first substrate, one surface of the fluorescent sheet, which is provided with the first substrate, is embedded into the groove, a light spot shaping device is arranged between the light outlet glass and the first substrate, and a gap is formed between the light spot shaping device and the first substrate;
the laser comprises a fast axis and a slow axis, the plane of the fast axis is perpendicular to the plane of the slow axis, the light emitting angle of the fast axis is L1, the light emitting angle of the slow axis is L2, L1/L2 is a, the laser excites the fluorescent sheet to emit fluorescence, the length of a fluorescent light spot in the plane of the fast axis is L3, the length of the fluorescent light spot in the plane of the slow axis is L3, L3 is not less than L4, and L3/L4 is less than a.
As an improvement of the technical scheme: the light spot shaping device is a rough surface with the haze of more than 50%, or a cylindrical mirror or a prism.
As an improvement of the technical scheme: the extension line of the cylindrical mirror or the prism in the length direction is parallel to the plane where the fast axis is located.
As an improvement of the technical scheme: the wavelength conversion device comprises a fluorescent sheet and a scattering sheet covered on the fluorescent sheet.
As an improvement of the technical scheme: the fluorescent sheet comprises a transparent heat-conducting first substrate and a fluorescent material arranged on the surface of the first substrate.
As an improvement of the technical scheme: the scattering sheet comprises a second substrate and a scattering material arranged on the surface of the second substrate.
As an improvement of the technical scheme: the side of the second substrate, on which the scattering material is arranged, faces the fluorescent sheet.
As an improvement of the technical scheme: the spot shaping device is integrally formed with the first substrate.
As an improvement of the technical scheme: the angle conversion device at least comprises a lens group, and each lens group comprises a convex lens and/or a concave lens.
Due to the adoption of the technical scheme, compared with the prior art, the laser emitted by the laser diode is shaped by the spot shaping device, the laser spot reaching the surface of the first substrate is enlarged, the phenomenon that the energy density of the laser irradiating the fluorescent sheet per unit area is too high and exceeds the capability of the fluorescent material for converting the laser is avoided, and the phenomenon that the fluorescent sheet is damaged due to too high local temperature in the process of converting the fluorescence by the fluorescent sheet is avoided.
The invention is further described with reference to the following figures and detailed description.
Drawings
Fig. 1 is a perspective view of a laser light emitting device.
Fig. 2 is a sectional view of a laser light emitting device.
Fig. 3 is a sectional view of a laser light emitting device.
Fig. 4 is a bottom view of a laser light emitting device.
FIG. 5 is a schematic structural diagram of a fluorescent sheet and a scattering sheet.
Detailed Description
Example (b):
as shown in fig. 1-5, a laser light emitting device includes a laser diode for emitting laser, the laser diode includes a tube housing 102 and a positioning base 103, the laser generated by the laser diode needs to be emitted out of the laser diode, so one end of the tube housing 102 is provided with a light exit glass from which the laser is emitted, the light exit glass is made of common glass, and the laser emitting device has the characteristics of high transmittance and low cost. The light outlet glass belongs to a vulnerable part and is easy to be damaged by collision in the transportation or use process. In the embodiment, the light-emitting glass is concave towards the tube shell 102 to form the groove, so that the design reduces the contact possibility between the light-emitting glass and the outside, and reduces the probability of breakage of the light-emitting glass.
The laser light emitting device needs to emit fluorescence through the laser excitation wavelength conversion device, the existing wavelength conversion device comprises a transmission type fluorescence piece and a reflection type fluorescence piece, and the transmission type fluorescence piece has the advantage that the length of a light path can be shortened, so the embodiment adopts the transmission type fluorescence piece which comprises a transparent and heat-conducting first substrate 112 and a fluorescent material 113 arranged on the surface of the first substrate 112, the fluorescence piece is simple in structure, the length of the light path can be shortened, and the size of the laser light emitting device is reduced as much as possible.
The laser emitted from the light outlet glass comprises a fast axis and a slow axis, and the light emitting angle of the laser in the fast axis direction is larger than that of the laser in the slow axis direction. Therefore, the size of the light spot formed by the laser penetrating through the light outlet glass in the near field and the far field is different, the light spot formed by the laser in the near field is smaller than that formed in the far field, and the smaller the light spot formed by the laser on the fluorescent sheet is, the smaller the light emitting area of the fluorescent sheet is, and the stronger the light intensity of the light emitting area is, so that the illumination requirement is better met. In order to reduce the spot size of the laser on the fluorescent sheet, in the present technical solution, the surface of the first substrate 112 away from the fluorescent material 113 is embedded in the groove, so as to further shorten the distance from the laser to the fluorescent sheet. The technical scheme reduces the distance between the first substrate 112 and the light outlet glass, and improves the luminous intensity of the luminous zone by shortening the spot size of the laser on the fluorescent sheet.
Because the fluorescent sheet is embedded into the groove, the distance between the light emitting area of the laser diode and the fluorescent sheet is reduced, the size of a light spot formed by the laser on the fluorescent sheet is reduced due to the distance reduction, and the energy density of the laser in the unit area of the fluorescent sheet is also improved. Because the conversion rate of the fluorescent material 113 to the laser is constant, increasing the energy density in the unit area of the fluorescent sheet easily causes the efficiency of converting the laser into the fluorescence by the fluorescent material 113 to be reduced, and causes the waste of the laser; secondly, heat is generated in the process of exciting the fluorescent material 113 by the laser, and when the light spot of the laser on the fluorescent sheet is reduced, the local temperature of the fluorescent sheet is too high, which easily damages the fluorescent sheet. In the prior art, a scattering sheet or a scattering device is usually added between the laser diode and the fluorescent sheet to solve similar problems, but in this embodiment, in order to control the size of the light spot formed by the laser on the fluorescent sheet, the fluorescent sheet is embedded in the groove, and no extra space is left between the light outlet glass and the fluorescent sheet to add the scattering device.
As mentioned above, the laser emitted from the laser diode includes a fast axis and a slow axis, and the light emitting angle of the laser in the fast axis direction is larger than that of the laser in the slow axis direction. Since the light emitting areas of the laser on the fluorescent sheet are elongated due to the different light emitting angles in the fast axis direction and the slow axis direction, it is more desirable to use a circular or approximately circular light spot in the illumination field.
In order to solve the above problem, the present embodiment solves the above problem by providing a rough surface on the surface of the first substrate 112 away from the fluorescent material 113, the rough surface functioning as a scattering sheet in the present embodiment and scattering the laser light with high energy density. The energy density of the scattered laser in unit area on the fluorescent sheet is reduced, so that the waste of the laser is avoided, and the damage to the fluorescent sheet caused by overhigh local temperature due to the excitation of the fluorescent material 113 by the laser is also avoided. The plane of the fast axis is vertical to the plane of the slow axis, and the laser spot in the far field is described by the two directions of the fast axis and the slow axis of the laser. To further describe the spot shape of the laser emitted by the laser diode, we define the light emitting angle of the laser in the fast axis as L1 and the light emitting angle in the slow axis as L2 in this embodiment, where L1/L2 is a, and since the light emitting angle of the laser in the fast axis direction is larger than that in the slow axis direction, the constant a > 1; according to the analysis, when the laser reaches the fluorescent piece to excite the fluorescent piece to emit fluorescence, the length of a fluorescent light spot in a plane where a fast axis of the laser is located is L3, the length of a fluorescent light spot in a plane where a slow axis of the laser is located is L4, and the ratio of L3 to L4 is compared with a, wherein L3/L4 is less than a. As described above, L1/L2 is a, and L3/L4 < a, and it is found that the laser beam is shaped by the roughened first substrate 112, and the light-emitting spot on the phosphor sheet is close to a circular shape.
As can be seen from the above analysis of the distance between the light emitting region of the laser diode and the fluorescent sheet, the smaller the distance between the surface of the first substrate 112 away from the fluorescent material 113 and the light exit glass is, the better, but the surface of the first substrate 112 away from the fluorescent material 113 is provided with a rough surface during the assembly. The reason for setting up the clearance is that laser diode produces a large amount of heats in the use, easily damages the fluorescence piece when the fluorescence piece hugs closely with light-emitting window glass, not only shortens the life-span of fluorescence piece, still influences the illuminating effect of device. It is necessary to provide a gap between the first substrate 112 and the light exit glass.
As can be seen from the above, the rough surface disposed on the surface of the first substrate 112 far from the fluorescent material 113 has a particularly great influence on the present patent, and what is defined as the rough surface, and what way the rough surface is obtained is related to the actual use effect. The matte is defined in this example by the haze, wherein the haze of the matte is greater than 50%. The haze is the percentage of the total transmitted light intensity of the transmitted light intensity which deviates from the incident light by an angle of 2.5 ° or more, and the larger the haze means that the film gloss and transparency, especially the image formation degree, are reduced, and thus it is understood that the larger the haze of the rough surface in the present embodiment is, the more suitable the application is. The rough surface formed on the surface of the first substrate 112 in this embodiment is sanded or machined into a plurality of grooves or protrusions to achieve a haze of greater than 50%. The rough surface formed by processing the surface of the first substrate 112 in one direction during the formation of the rough surface by sanding or machining is a one-dimensional rough surface, and if the rough surface formed by processing the surface of the first substrate 112 in two mutually perpendicular directions or in a random manner is a two-dimensional rough surface, in a preferred embodiment, the rough surface is a one-dimensional rough surface. The roughening direction of the one-dimensional rough surface is parallel to the plane where the slow axis is located, laser is diffused in the direction of the slow axis at the moment, the length difference of luminous spots on the fluorescent sheet in the direction of the fast axis and the direction of the slow axis is reduced, and the luminous spots on the fluorescent sheet are approximate to a circle.
The illumination effect of the laser light emitting device is not only related to the light intensity, but also related to the color temperature, and in order to obtain a laser light emitting device with controllable color temperature, the laser light emitting device further includes a scattering sheet, and the scattering sheet includes a second substrate 115 and a scattering material 114 disposed on the surface of the second substrate 115. The fluorescent light and the laser light emitted by the fluorescent sheet enter the diffuse scattering sheet, the diffuse scattering sheet reflects, refracts and scatters the laser light and the fluorescent light entering the diffuse scattering sheet, the ratio of the fluorescent light and the laser light in the mixed light finally emitted by the transmission type wavelength conversion device is changed through the structure, and the color temperature of the emitted light is changed. The second substrate 115 is made of a highly transparent material, and glass is used in this embodiment, which is low in cost and easy to obtain.
Since the fluorescence emitted from the fluorescent sheet is lambertian, the longer the optical path, the larger the spot area of the fluorescence on the scattering material 114, and the weaker the central light intensity as can be seen from the conservation of etendue, a preferred embodiment is that the surface of the second substrate 115 on which the scattering material 114 is disposed is attached to the fluorescent material 113. The technical scheme ensures that the mixed light emitted by the fluorescent sheet immediately enters the scattering material 114, shortens the distance from the fluorescent sheet to the scattering material 114, reduces the area of a light spot formed on the scattering material 114, increases the central light intensity and better meets the illumination requirement.
The surface of the fluorescent sheet provided with the fluorescent material 113 and the first scattering layer in this embodiment are close to each other, and are not integrally connected by bonding or other means. In a preferred embodiment, an air gap is provided between the fluorescent sheet and the scattering material 114, that is, an air gap is provided between the fluorescent material 113 and the scattering material 114. The purpose of adding the scattering sheet is to adjust the color temperature of the light emitted by the transmissive wavelength conversion device, if the fluorescent material 113 and the scattering material 114 are completely and tightly attached, which is equivalent to that the scattering material 114 and the fluorescent material 113 form a whole, the laser or the fluorescence enters the scattering material 114 from the fluorescent material 113 and propagates in the same medium, at this time, the laser and the fluorescence are emitted from the scattering material 114 to the air, as if the laser and the fluorescence are emitted from the material with a large refractive index to the material with a small refractive index, at this time, the laser or the fluorescence is totally reflected when the refractive angle is large, the laser or the fluorescence cannot be directly emitted from the scattering material 114 due to the total reflection, the laser or the fluorescence needs to be totally reflected and scattered when the laser or the fluorescence is emitted from the scattering material 114, and the light emitting area of the light emitted from the scattering material 114 after the laser or the fluorescence is totally reflected and scattered in the scattering material 114 is increased, according to the conservation of etendue, increasing the light emitting area necessarily results in the central light intensity being decreased. Since the fluorescence is lambertian, an excessively large air gap will cause an increase in the light spot entering the scattering material 114, and as can be seen from the conservation of the etendue, the light spot is increased and the central light intensity is reduced, in a preferred embodiment, the thickness of the air gap is less than or equal to the thickness of the fluorescent material 113, and the light spot size is controlled within a reasonable range without affecting the illumination intensity of the light-emitting device. Since the fluorescent material 113 and the scattering material 114 are both composed of a plurality of particles, an air gap can be formed by placing the fluorescent material 113 and the scattering material 114 together without additional processing.
Because the light outlet glass needs to be infinitely close to the fluorescent sheet but needs to have a gap, the distance control between the light outlet glass and the fluorescent sheet becomes more important, the existing laser diode is installed in a mode that the laser diode is fixed in the shell, and then the fluorescent sheet covers the light outlet glass, the installation method is complex, and the assembly cost is high.
The present embodiment provides a method for mounting a laser diode that is easy to mount by the positioning base 103 on the package 102 cooperating with the main housing 101 and the like. The positioning base 103 comprises a mounting positioning surface 104, one end of the pipe shell 102 is fixed on the mounting positioning surface 104, and the outer contour dimension of the positioning base 103 is larger than the outer diameter of the pipe shell 102. The other end of the case 102 includes a light exit port 105, and the light exit port 105 is used for emitting laser light. The main housing 101 includes a laser mounting cavity 106, the laser mounting cavity 106 having an inner diameter greater than the outer diameter of the housing 102 and less than the outer dimensions of the positioning base 103. In the present invention, the outer diameter of the tube housing 102 is smaller than the inner diameter of the laser installation cavity 106, and the outer size of the positioning base 103 is larger than the outer diameters of the tube housing 102 and the laser installation cavity 106, so that the end of the tube housing 102 including the light exit port 105 can extend into the laser installation cavity 106. One end of the tube shell 102 is fixed on the positioning base 103, one end of the tube shell 102, which includes the light outlet 105, extends into the laser installation cavity 106, and the positioning base 103 is outside the laser installation cavity 106. The connection between the package 102 and the laser mounting cavity 106 can derive the position of the light port 105, and the laser emitted from the light port 105 exits along the laser mounting cavity 106.
Because the outer contour dimension of the positioning base 103 is larger than the inner diameter of the laser installation cavity 106, when the tube housing 102 extends into the laser installation cavity 106, the installation positioning surface 104 is closely attached to the end of the main housing 101 where the laser installation cavity 106 is arranged. Therefore, the end of the main housing 101 where the laser installation cavity 106 is located includes an end rim 107 closely attached to the installation positioning surface 104, and the end rim 107 closely attached to the installation positioning surface 104 limits the length of the package 102 extending into the laser installation cavity 106. The mounting and positioning surface 104 is in contact with the end outer edge 107, and a heat transfer medium is provided between the mounting and positioning surface 104 and the end outer edge 107 in order to make the best use of the design of the contact. A heat conducting medium is added between the two to conduct heat generated during the use of the laser diode to the end outer edge 107 through the positioning base 103. This technical scheme utilizes main casing body 101 supplementary laser diode to dispel the heat, and the radiating effect is better.
In the technical scheme, the pipe shell 102 extends into the laser installation cavity 106, the positioning base 103 is exposed outside, the laser diode is high in cost and easy to damage due to collision or corrosion, and the positioning base 103 is short of necessary protection. Therefore, a positioning shell 108 is further included on the outer periphery of the positioning base 103, and in a preferred embodiment, the positioning shell 108 is a closed circular ring, and the positioning shell 108 surrounds the outer periphery of the positioning base 103. The positioning shell 108 is fixedly connected with the main shell 101, and the positioning shell 108 is fixedly connected with the main shell 101 through welding, bonding and the like. The positioning housing 108 protects the positioning base 103 that does not extend into the laser installation cavity 106, and prevents the positioning base 103 from being exposed to the outside and damaged due to impact or corrosion.
The laser emitted from the light outlet 105 includes a fast axis and a slow axis, wherein the light emitting angle of the fast axis is larger than that of the slow axis. The above characteristics can be distinguished only when the laser diode is electrified, but the laser is directly emitted to threaten the life and property safety of assembly workers, and the laser diode cannot be electrified in the assembly process. Therefore, a circumferential mounting mark is required in the laser diode assembling process. In order to solve the above problem, a preferred embodiment is that the outer wall of the positioning base 103 is provided with a first positioning recess 110. The first positioning recess 110 can be used for mounting identification of the laser diode, and the package 102 can be mounted in the laser mounting cavity 106 as required without being electrified during mounting.
The technical scheme only solves the problem of identification in the circumferential direction of the laser diode during installation, and the laser diode is required to be positioned in the circumferential direction and the radial direction during installation. In light of the above problem, in a preferred embodiment, the inner wall of the positioning shell 108 is provided with a second positioning recess 109, and the first positioning recess 110 and the second positioning recess 109 are spliced to form a positioning hole, in which the positioning granule 111 is placed. In the embodiment, the positioning particles 111 are placed in the positioning holes to position the laser diode in the circumferential direction and the radial direction. In the present embodiment, a ball is used as the positioning particle 111, however, the positioning particle 111 is not limited to a ball, and may be a component capable of limiting the rotation of the laser diode in the laser mounting cavity 106 and the movement of the laser diode along the laser mounting cavity 106, such as glue for adhesion, a pin, and the like. In a preferred embodiment, the first positioning recess 110 extends from an end near the mounting surface 104 to an end away from the mounting surface 104. Because the first positioning recess 110 is already disposed on the positioning base 103, the second positioning recess 109 is disposed on the positioning shell 108, and when the second positioning recess 109 and the first positioning recess 110 cooperate to form a positioning hole, a positioning particle 111 is added in the positioning hole. This embodiment has fully utilized the first location sunken 110 that plays the identification effect, uses first location sunken 110, second location sunken 109 and location granule 111 jointly, fixes a position laser diode circumference and radial simultaneously, has avoided laser diode at laser installation cavity 106 internal rotation. If a first positioning recess 110, a second positioning recess 109 and a positioning particle 111 are a set of fixing mechanisms, an embodiment comprising two sets of fixing mechanisms is shown in this embodiment, and one or more sets of fixing mechanisms may be provided as required. The fundamental purpose of adding multiple groups of fixing mechanisms is to ensure that the laser diode is more firmly installed and fixed and the reliability of the light source is improved.
As can be seen from the above analysis of the technical solutions, when the first positioning recess 110, the second positioning recess 109 and the positioning particles 111 are used for fixing or positioning, the inner wall of the positioning shell 108 contacts with the outer wall of the positioning base 103. Therefore, in a more preferred embodiment, a heat conducting medium is filled between the side wall of the installation positioning base 103 and the positioning shell 108. And a heat conducting medium is filled between the positioning shell 108 and the positioning base 103, and the positioning shell 108 is used for assisting the laser diode in heat dissipation, so that the heat dissipation capacity of the light source is improved.
Because the laser diode in this embodiment adopts the case 102 disposed in the laser installation cavity 106, the positioning surface 104 and the end outer edge 107 are used for limiting and conducting heat, and the positioning case 108 is used for positioning, fixing and conducting heat for the laser diode. Compared with the prior art, the one side that the location base 103 is relative with installation locating surface 104 in this application directly exposes externally, and the radiating effect has obtained obvious improvement, and location shell 108 both can protect laser diode not receive external collision, can fix laser diode again, avoids tube 102 internal rotation or removal in laser installation cavity 106. Second, heat generated by the laser diode can be conducted into the positioning shell 108 to assist the laser diode in dissipating heat.
Although several embodiments of the present invention have been described in detail, the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (10)

1. A laser light emitting device characterized in that: the laser diode comprises a tube shell and a positioning base, wherein one end of the tube shell is provided with light outlet glass, laser is emitted from the light outlet glass, and the light outlet glass is inwards concave towards the tube shell to form a groove; the fluorescent piece comprises a transparent and heat-conducting first substrate and a fluorescent material arranged on the surface of the first substrate, one surface of the first substrate, which is far away from the fluorescent material, is embedded into the groove, one surface of the first substrate, which is embedded into the groove, is a rough surface, and a gap is arranged between the first substrate and the light outlet glass;
the laser comprises a fast axis and a slow axis, the plane of the fast axis is perpendicular to the plane of the slow axis, the light emitting angle of the fast axis is L1, the light emitting angle of the slow axis is L2, L1/L2 is a, the laser excites the fluorescent sheet to emit fluorescence, the length of the fluorescent light spot in the plane of the fast axis is L3, the length of the fluorescent light spot in the plane of the slow axis is L4, and L3/L4 is less than a.
2. A laser light emitting device according to claim 1, wherein: the matte surface has a haze of greater than 50%.
3. A laser light emitting device according to claim 1, wherein: the rough surface is a one-dimensional rough surface.
4. A laser light emitting device according to claim 1, wherein: the scattering sheet comprises a second substrate and scattering materials arranged on the surface of the second substrate.
5. The laser light emitting device according to claim 5, wherein: one side of the second substrate, provided with the scattering material, is attached to the fluorescent material.
6. A laser light emitting device according to claim 1, wherein: the location base includes an installation locating surface, and tube one end is fixed on the installation locating surface, and the outline size of location base is greater than the external diameter of tube, and the other end of tube includes the light-emitting window, still includes the main casing body, the main casing body includes laser installation cavity, the one end that the main casing body is provided with laser installation cavity includes the tip outer fringe, and laser installation cavity internal diameter is greater than the external diameter of tube to be less than the outline size of location base, tip outer fringe pastes on the installation locating surface, and in the tube stretched into laser installation cavity, be provided with the heat-conducting medium between installation locating surface and the tip outer fringe.
7. The laser light-emitting device according to claim 6, wherein: still including the location shell of location base periphery, be provided with heat-conducting medium between location base and the location shell, location shell and main casing body fixed connection.
8. A laser light emitting device according to claim 7, wherein: the outer wall of the positioning base is provided with a first positioning recess.
9. A laser light emitting device according to claim 8, wherein: the inner wall of the positioning shell is provided with a second positioning recess, the first positioning recess and the second positioning recess are spliced to form a positioning hole, and positioning particles are placed in the positioning hole.
10. A light fixture, characterized by: comprising the laser emitting device of any one of claims 1-9.
CN202010983077.0A 2020-09-03 2020-09-18 Laser light-emitting device and lamp Pending CN114135803A (en)

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CN202010915426 2020-09-03
CN2020109154265 2020-09-03

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