CN114815479A - Laser light source and laser projection device - Google Patents

Abstract

The application discloses laser light source and laser projection device relates to projection device technical field for solve the poor problem of fluorescence wheel radiating effect of laser projection equipment among the prior art. The laser light source comprises a laser for providing a lighting source, an installation shell, an air guide structure and a fluorescent wheel, wherein an installation cavity is formed in the installation shell; the fluorescence wheel sets up in the installation intracavity, and the region that is close to the outside edge on the fluorescence wheel is equipped with fluorescence laser zone, and the illuminating beam that the laser instrument sent passes through on going into the light mouthful incides the fluorescence laser zone of fluorescence wheel, and the central zone of fluorescence wheel is equipped with a plurality of blades, a plurality of blades along the circumference interval distribution of fluorescence wheel, and be used for guiding the wind-guiding structure with the near heat dissipation air current of fluorescence wheel, and the wind-guiding structure is used for leading the heat dissipation air current back to fluorescence laser zone. The laser light source of the application is used for emitting light beams.

Description

Laser light source and laser projection device

Technical Field

The application relates to the technical field of projection devices, in particular to a laser light source and a laser projection device.

Background

The laser projection display technology is an optical display technology which adopts a semiconductor laser to convert electric energy into light energy and projects the laser onto a screen through a light path system, a circuit system and a lens system. The light path system of the laser projection device comprises a fluorescent wheel, wherein the fluorescent wheel is one of key elements in the light path system, the fluorescent wheel rotating at a high speed can separate part of blue laser light sources into red and green light sources, and finally, red, green and blue three-primary-color pictures are output to a projection screen through a DMD chip and a lens in the light machine.

The fluorescent wheel among the current laser projection equipment is sealed inside the light source casing, and when laser projection equipment normally worked, the light beam that the laser instrument sent can assemble into a facula through a plurality of lenses, and the facula hits the fluorescence excitation area on the fluorescent wheel of high-speed rotation to produce fluorescence, fluorescent wheel fluorescence excitation area can form a heat clitellum simultaneously, and fluorescent wheel meeting temperature rise, and its reliability can descend rapidly. Some fluorescent wheels have several blades machined on their surface, and when the fluorescent wheel rotates at high speed, the blades on the fluorescent wheel will generate forward airflow, thereby disturbing the airflow inside the light source housing.

When the light source brightness of a laser in the existing laser projection equipment is improved, the energy of light spots on the surface of a fluorescence excitation area of a fluorescence wheel is increased, so that the thermal power density on the surface of the fluorescence wheel is rapidly increased. Taking the existing 8000lm (lumen) laser projection equipment as an example, the thermal power of the surface of the fluorescent wheel can reach 183W, and through tests, when the ambient temperature is 25 ℃, the temperature of the surface of a fluorescence excitation area is 215 ℃ for the fluorescent wheel without blades; for the fluorescent wheel with a plurality of blades, the temperature of the surface of the fluorescence excitation area is 211 ℃, the improvement of the heat dissipation effect is small, and the temperature of the surface of the fluorescence excitation area still exceeds 180 ℃ of the specification requirement, so that the reliability of the fluorescent wheel is poor.

Disclosure of Invention

The embodiment of the application provides a laser light source and a laser projection device, which are used for solving the problem that a fluorescent wheel of laser projection equipment in the prior art is poor in heat dissipation effect.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, an embodiment of the present application provides a laser light source, including: a laser for providing an illumination source; the mounting device comprises a mounting shell, a light source and a light source, wherein a mounting cavity is formed in the mounting shell, and the mounting shell is provided with a light inlet communicated with the mounting cavity; the air guide structure is arranged in the mounting shell; the air guide structure comprises a fluorescent wheel, the fluorescent wheel is arranged in the installation cavity, a fluorescent laser area is arranged on the fluorescent wheel in an area close to the outer edge, an illuminating light beam emitted by the laser enters the fluorescent laser area of the fluorescent wheel through the light inlet, a plurality of blades are arranged in the central area of the fluorescent wheel, the blades are distributed at intervals along the circumferential direction of the fluorescent wheel and used for guiding air heat dissipation airflow near the fluorescent wheel to the air guide structure, and the air guide structure is used for guiding the heat dissipation airflow back to the fluorescent laser area of the fluorescent wheel.

In some possible embodiments of the present application, the air guiding structure is an air guiding surface disposed on an inner wall of the mounting housing, and the air guiding surface is disposed opposite to an air outlet side of the blade of the fluorescent wheel.

In some possible embodiments of the present application, a wind guide groove is formed in a portion of an inner wall of the mounting housing, which is opposite to the wind outlet side of the blade, and the wind guide surface is a groove wall surface of the wind guide groove.

In some possible embodiments of the present disclosure, the air guiding groove is an arc groove, a square groove or a triangular groove.

In some possible embodiments of the present application, the air guiding groove is an arc-shaped groove, and a radius R of the arc-shaped groove satisfies: r is 1.2R, and R is the radius of the fluorescent wheel.

In some possible embodiments of the present application, the air guide groove is a square groove, and a depth of the square groove ranges from 1 mm to 3 mm.

In some possible embodiments of the present application, the air guiding groove is a triangular groove, and a minimum distance between the triangular groove and an outer wall of the air guiding groove is 1-1.5 mm.

In some possible embodiments of the present application, the heat sink further includes a plurality of heat dissipation fins, and the plurality of heat dissipation fins are arranged on the outer wall of the mounting housing at intervals.

In some possible embodiments of the present application, the air guiding structure further includes a heat sink, and the heat sink is mounted on an outer wall of the mounting housing at a position corresponding to the air guiding structure.

In a second aspect, an embodiment of the present application provides a laser projection apparatus, including the laser light source described in the above embodiment.

The embodiment of the application provides a laser light source and a laser projection device, when the fluorescent wheel rotates at a high speed (for example, the rotating speed of the fluorescent wheel is 7200 rpm), a plurality of blades can generate high-speed airflow (for example, the speed of the airflow is 1.6 m/s-2 m/s), the airflow can blow to the inner wall of the installation shell and move along the inner wall of the installation shell, and due to the fact that the air guide structure is arranged in the installation shell, the air guide structure can redirect the heat dissipation airflow blowing to the inner wall of the installation shell to the fluorescent laser area of the fluorescent wheel, the heat dissipation airflow flow of the fluorescent laser area of the fluorescent wheel is further accelerated, the heat of the fluorescent wheel can be rapidly brought to other low-temperature areas in the installation shell, and the temperature of the fluorescent wheel is further reduced. Through the test, will blow the heat dissipation air current that the inner wall of installation casing will be directed back to the fluorescence laser region of fluorescence wheel again with wind-guiding structure and dispel the heat, can make the radiating efficiency of fluorescence wheel can improve to 76%.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic optical path diagram of a laser projection apparatus according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of a laser light source in a laser projection apparatus according to an embodiment;

FIG. 3 is a schematic view of an exemplary laser source assembly of a laser projection apparatus;

FIG. 4 is a schematic diagram illustrating a structure of a portion of components in a laser light source of a laser projection apparatus according to an embodiment;

FIG. 5 is a schematic side view of a fluorescent wheel in a laser light source according to an embodiment of the present disclosure;

FIG. 6 is a front view of a fluorescent wheel in a laser light source according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a laser light source in a laser light source according to an embodiment of the present disclosure;

FIG. 8 is a schematic cross-sectional view of a laser light source according to an embodiment of the present disclosure;

FIG. 9 is a second schematic cross-sectional view of a laser source according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a fluorescent wheel and a sealing cover in a laser light source according to an embodiment of the present application;

FIG. 11 is a schematic cross-sectional view of a sealing cap with an arc-shaped inner wall as a groove in a laser light source according to an embodiment of the present disclosure;

FIG. 12 is a schematic cross-sectional view of a laser light source according to an embodiment of the present disclosure, in which the inner wall of the sealing cap is a square groove;

FIG. 13 is a schematic cross-sectional view of a laser light source according to an embodiment of the present disclosure, in which the inner wall of the sealing cap is a triangular groove.

Reference numerals:

1-laser projection device, 10-laser light source, 20-optical machine, 30-projection lens, 40-projection screen, 110-fluorescent wheel, 1100-light receiving surface, 1101-blade, 120-laser, 130-installation shell, 1301-sealing cover, 1302-air guide structure, 1302 a-circular arc groove, 1302 b-square groove, 1302 c-triangular groove, 1303-heat dissipation fin, 131-installation cavity, 132-light inlet, 133-maintenance port and 140-first heat dissipation device.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description of the present application, "and/or" is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The laser light source is a light source that emits monochromatic coherent light beams with high brightness and high directivity, and has been gradually applied to the field of projection display in recent years due to many advantages of the laser light source.

Referring to fig. 1, a laser projection apparatus 1 according to an embodiment of the present disclosure includes a laser light source 10, an optical engine 20, and a projection lens 30, where the laser light source 10, the optical engine 20, and the projection lens 30 are sequentially connected along a light beam transmission direction, and each has a corresponding housing to wrap the housing, so as to support an optical component and enable each optical component to meet a certain sealing or airtight requirement.

The laser light source 10 is configured to emit a light beam, the optical engine 20 is configured to modulate the light beam to generate an image light beam when being irradiated by the light beam emitted from the laser light source 10, and the projection lens 30 is configured to project the image light beam onto the projection screen 40. The arrows in fig. 1 show the propagation directions of the light beams in the 3 optical components of the laser light source 10, the optical engine 20 and the projection lens 30 in the laser projection apparatus 1.

For example, the laser light source 10, the optical engine 20 and the projection lens 30 may be applied to a laser projector, that is, the laser projection apparatus 1 is a laser projector.

There are many laser light sources 10 of the current laser projectors, and the laser light source 10 may include at least one laser, and the laser light source 10 is used for emitting laser light of at least one color. The laser light source 10 may be a monochromatic laser light source (i.e. including one laser emitting laser light of one color), a bichromatic laser light source (i.e. including a plurality of lasers emitting laser light of two colors), or a full-color laser light source (i.e. including a red laser, a blue laser, and a full-color laser).

Referring to fig. 2, fig. 2 is a schematic structural diagram of a laser light source 10 according to an embodiment of the present invention, and arrows in fig. 2 illustrate a gas flow method.

When the laser light source 10 is a monochromatic light source, the laser light source 10 at least includes a fluorescent wheel 110, a filtering color wheel, a light homogenizing element and a laser 120, and the fluorescent wheel 110, the filtering color wheel and the light homogenizing element are sequentially located on a light emitting path of the laser 120.

FIG. 5 is a schematic side view of a fluorescent wheel 110 of the laser light source 10 according to the embodiment; fig. 6 is a front view of the fluorescent wheel 110 in the laser light source 10 according to the embodiment.

Referring to fig. 5 and 6, a region of the fluorescent wheel 110 near the outer edge is provided with a fluorescence excitation region along a circumferential direction, and when the fluorescent wheel 110 rotates at a high speed, laser light emitted by the laser 120 may irradiate the fluorescence excitation region of the fluorescent wheel 110, so that phosphor in the fluorescence excitation region outputs fluorescence of at least one color, and the fluorescence emitted by the fluorescent wheel 110 and the laser light emitted by the laser 120 jointly form three primary colors, which serve as a projection light source to provide illumination for the light engine 20.

It should be noted that, the region near the outer edge of the fluorescent wheel 110 is provided with a transmission region in addition to the fluorescence excitation region, the transmission region and the fluorescence excitation region are distributed at intervals along the circumferential direction of the fluorescent wheel 110, and when the laser emitted by the laser 120 irradiates the transmission region on the fluorescent wheel 110, the laser directly transmits out from the transmission region.

The color filter wheel includes a filter area corresponding to the fluorescence excitation area of the fluorescence wheel 110. The color filter wheel can filter the fluorescence and improve the color purity, thereby outputting three primary colors of red light, blue light and green light in a time sequence.

The light homogenizing element may be any one of a light pipe and a light homogenizing rod, or a light pipe and light homogenizing rod assembly, and performs light homogenizing processing on the light beam coming out of the color filter wheel 120.

Fig. 3 is an assembly diagram of the laser light source 10 in the laser projection apparatus 1 according to the embodiment, and fig. 4 is a structural diagram of a middle assembly of the laser light source in the laser projection apparatus according to the embodiment, wherein the middle assembly includes the fluorescent wheel 110, the mounting housing 130 and the sealing cover 1301.

Referring to fig. 2 to 4, in some embodiments of the present application, the laser light source 10 includes a mounting housing 130, wherein a mounting cavity 131 is formed in the mounting housing 130, and the fluorescent wheel 110 is disposed in the mounting cavity 131. The mounting housing 130 is provided with a light inlet 132, the light inlet 132 is communicated with the mounting cavity 131, and the illumination beam emitted by the laser 120 can be projected on the fluorescence excitation area of the fluorescence wheel 110 through the light inlet 132.

The laser light source 10 further includes a first heat sink 140, the first heat sink 140 is disposed outside the mounting housing 130, heat generated by the fluorescent wheel 110 is radiated to the air in the mounting housing 130 and then conducted to the mounting housing 130, and the first heat sink 140 can exchange heat with the mounting housing 130 in a heat conduction manner, so as to dissipate heat generated by the fluorescent wheel 110.

The first heat dissipation device 140 is any one of a profile heat sink, an insert heat sink, a heat pipe heat sink, and a liquid cooling heat sink. The section radiator and the insert radiator are both radiators with radiating areas increased by the radiating fins 1303, and the manufacturing material is aluminum or copper, so that the cost is low; the heat pipe radiator utilizes the heat pipe technology to radiate heat and has high heat conductivity; the liquid cooling radiator adopts the cooling liquid to carry out the radiator of heat dissipation cooling, and its radiating efficiency is high, and the radiating effect is good.

For the laser light source 10 only provided with the first heat dissipation device 140, no flowing gas is inside the installation housing 130, and under the condition of high thermal power density of the fluorescent wheel 110, natural convection is adopted in the installation housing 130 for heat dissipation, and the heat dissipation speed is slow, so in order to meet the heat dissipation requirement of the fluorescent wheel 110, the structure design of the installation housing 130 needs to be complex, the volume of the laser light source 10 is large, the cost of the whole laser light source 10 is increased, and even the heat dissipation requirement of the fluorescent wheel 110 cannot be met through the structure design of the installation housing 130.

The heat dissipation efficiency of the surface of the fluorescent wheel 110 is related to the temperature, the flow rate, the contact area and other factors of the heat exchange gas, and the lower the temperature, the larger the flow rate and the larger the contact area of the heat exchange gas are, the better the heat dissipation effect is. On the premise of not changing the size of the fluorescent wheel 110 and the rotating speed of the fluorescent wheel 110, the best way to improve the heat dissipation efficiency of the surface of the fluorescent wheel 110 is to increase the gas flow rate on the surface of the fluorescent wheel 110. The heat dissipation performance is usually measured by the convective heat transfer coefficient, which is generally 1-10W/(m) for natural convection ² K) and the forced convection heat transfer coefficient is generally 20 to 100W/(m) ² ·K)。

Referring to fig. 4 to 6 and 9, the fluorescent wheel 110 of the embodiment of the present application is disposed in the mounting cavity 131, the fluorescent laser region is located on the light receiving surface 1100 of the fluorescent wheel 110 near the outer edge, and the fluorescent laser region of the fluorescent wheel 110 faces the light inlet 132 of the mounting housing 130 and is located on the light emitting path of the laser 120, so that the fluorescent wheel 110 can receive the laser light emitted by the laser 120; the plurality of blades 1101 are arranged in the central region of the fluorescent wheel 110, the plurality of blades 1101 are distributed at intervals along the circumferential direction of the fluorescent wheel 110, and when the fluorescent wheel 110 rotates at a high speed, the plurality of blades 1101 promote the air near the fluorescent wheel 110 to flow outwards, so that the air near the fluorescent wheel 110 and the fluorescent wheel 110 perform forced convection, the forced convection heat exchange coefficient of the fluorescent wheel 110 and the gas flow velocity on the surface of the fluorescent wheel 110 are improved, and the heat dissipation efficiency of the fluorescent wheel 110 is improved.

Referring to fig. 2 and 3, the mounting case 130 is provided with an access opening 133, the access opening 133 is located above the light inlet 132, the access opening 133 is opposite to the light receiving surface 1100 of the fluorescent wheel 110, the mounting case 130 includes a sealing cover 1301, the sealing cover 1301 is used for sealing the access opening 133, the inner surface of the sealing cover 1301 is a plane, the sealing cover 1301 is installed in an inclined manner, and the upper end of the sealing cover 1301 is close to the fluorescent wheel 110. When the fluorescent wheel 110 rotates at a high speed, the plurality of blades 1101 disturb the gas near the fluorescent wheel 110, so that the gas forms a heat dissipation gas flow moving in a direction perpendicular to the fluorescent wheel 110, and the heat dissipation gas flow blows to the inner wall of the sealing cover 1301 and moves along the inner wall of the sealing cover 1301, is guided to the light inlet 132 below, and enters the laser 120 through the light inlet 132.

It should be noted that the access opening 133 may be disposed below the light inlet 132 according to the actual structural design requirement, and accordingly, the upper end of the sealing cover 1301 disposed obliquely may be disposed away from the fluorescent wheel 110, thereby ensuring that the heat dissipating air flow blowing onto the sealing cover 1301 is guided into the laser 120.

When the fluorescent wheel 110 rotates at a high speed (e.g., the rotation speed of the fluorescent wheel 110 is 7200 rpm), the plurality of blades 1101 can generate a high-speed airflow of 1.6m/s to 2m/s, so as to increase the flow velocity of the heat dissipation airflow on the surface of the fluorescent wheel 110, thereby increasing the heat dissipation efficiency of the fluorescent wheel 110, but when the brightness of the light source of the laser 120 is high, e.g., when the brightness of the light source of the laser 120 is increased, the heat dissipation requirement of the fluorescent wheel 110 cannot be satisfied.

Fig. 7 is a schematic structural diagram of a laser light source in a laser light source according to an embodiment of the present application, fig. 8 is a schematic cross-sectional diagram of the laser light source in the laser light source according to the embodiment of the present application, fig. 9 is a second schematic cross-sectional diagram of the laser light source in the laser light source according to the embodiment of the present application, viewing angles of fig. 8 and fig. 9 are different, fig. 10 is a schematic structural diagram of a fluorescent wheel and a sealing cover in the laser light source according to the embodiment of the present application, and an arrow in fig. 10 is a flow direction of a gas.

Referring to fig. 7 to 10, the laser light source 10 in the embodiment of the present application includes a wind guiding structure 1302, the wind guiding structure 1302 may be disposed in the installation housing 130, and the wind guiding structure 1302 may be capable of guiding the heat dissipating airflow blown onto the inner wall of the installation housing 130 back to the fluorescence excitation area of the light receiving surface 1100 of the fluorescence wheel 110 (the light receiving surface 1100 refers to a surface of the fluorescence wheel 110 opposite to the light emitting direction of the laser 120), so as to further accelerate the heat dissipating airflow flowing in the fluorescence excitation area of the fluorescence wheel 110, so that the heat in the fluorescence excitation area of the fluorescence wheel 110 can be quickly brought to other low temperature areas in the installation housing 130, thereby further reducing the temperature of the fluorescence wheel 110. Through tests, the air guide structure 1302 guides the heat dissipation airflow blown onto the inner wall of the installation shell 130 back to the light receiving surface 1100 of the fluorescent wheel 110 for heat dissipation, so that the heat dissipation efficiency of the fluorescent wheel 110 can be improved to 76% at most.

It should be noted that the wind guiding structure 1302 may be disposed in any area of the installation housing 130 directly blown by the blade 1101, for example, the wind guiding structure 1302 is disposed on the inner wall of the sealing cover 1301, or the wind guiding structure 1302 is disposed on other inner wall area of the installation housing 130 directly blown by the blade 1101. The air guide structure 1302 is provided on the inner wall of the sealing cover 1301 as an example.

For example, the air guiding structure 1302 is an air guiding surface arranged on the inner wall of the sealing cover 1301 of the installation shell 130, that is, the inner wall of the sealing cover 1301 is directly arranged into an inner wall structure with the air guiding surface, and the inner wall of the modified sealing cover 1301 can realize the air guiding function of the air guiding structure 1302; or the air guide structure 1302 is an air guide member, the air guide member can be installed on the inner wall of the sealing cover 1301 of the installation shell 130, the air guide function of the air guide structure 1302 is realized by arranging a special air guide member, the scheme changes the inner wall of the sealing cover 1301 of the original installation shell 130 little or nothing, the original sealing cover 1301 can be utilized, and the modification cost is low.

Specifically, the shape of the air guide surface on the inner wall of the seal cover 1301 of the installation case 130 and various structural parameters related thereto are designed according to the air outlet field formed by the blades 1101 of the fluorescent wheel 110. For example, a part of the inner wall of the sealing cover 1301 of the mounting case 130, which is opposite to the air outlet side of the blade 1101, is provided with an air guide protrusion, and the air guide structure 1302 is a convex surface of the air guide protrusion; for another example, an air guiding groove is formed on a part of the inner wall of the sealing cover 1301 of the mounting case 130, which is opposite to the air outlet side of the blade 1101, and the air guiding structure 1302 is a groove wall surface of the air guiding groove.

In some embodiments of the present application, a design scheme is adopted in which a wind guiding structure 1302 having an inner wall shape of a wind guiding surface is provided on an inner wall of the sealing cover 1301. Specifically, an arc-shaped groove, a square groove or a triangular groove is formed in the flat inner wall of the original sealing cover 1301, namely, a groove is formed in the flat inner wall of the original sealing cover 1301, the cross section of the groove can be arc-shaped, square or triangular, the groove structures of the three shapes are simple, the processing is convenient, and the air guide effect is good.

When the average wind speed actually generated by the fluorescent wheel 110 is 1.6m/s, the convective heat transfer coefficient flowing through the surface of the fluorescent wheel 110 is increased to 40W/(m) according to the forced convection calculation formula by testing the laser light source 10 ² K), the air guiding structure 1302 guides the air flow generated by the fluorescent wheel 110 and moving outward back to the fluorescent wheel 110 for self-heat dissipation, so that the surface temperature of the fluorescent wheel 110 can be lowered by 7.9 ℃.

Fig. 11 is a schematic cross-sectional view of a sealing cover 1301 with a circular arc-shaped groove 1302a on its inner wall in the laser light source 10 according to the embodiment of the present application.

When designing the structural parameters of the circular arc-shaped groove 1302a on the inner wall of the sealing cover 1301, the smoothness of the circular arc-shaped groove 1302a, the material of the sealing cover 1301, the radius of the circular arc-shaped groove 1302a, and the like all have influence on the air guiding effect of the inner wall of the sealing cover 1301, wherein the influence of the radius of the circular arc-shaped groove 1302a on the air guiding effect is large. If the radius R of the circular arc-shaped groove 1302a on the inner wall of the sealing cover 1301 is too large, the thickness of the mounting housing 130 is thin, and the structural strength of the sealing cover 1301 is too low; if the radius R of the circular arc-shaped groove 1302a on the inner wall of the sealing cover 1301 is too small, only a small amount of air flow blown onto the inner wall of the sealing cover 1301 can be guided back to the light receiving surface 1100 of the fluorescent wheel 110, and the air guiding effect is poor. Therefore, referring to fig. 10 and 11, in the embodiment of the present application, the radius R of the fluorescent wheel 110 where the radius R of the circular arc-shaped groove 1302a on the inner wall of the sealing cover 1301 is 1.2, that is, R is 1.2R, the air guiding effect is good on the basis of ensuring the structural strength of the sealing cover 1301, the loss of the air flow velocity blowing to the inner wall of the sealing cover 1301 is small, and the heat dissipation effect on the fluorescent wheel 110 is good.

Fig. 12 is a schematic cross-sectional view of a sealing cover 1301 with a square-shaped groove 1302b on the inner wall thereof in the laser light source 10 according to the embodiment of the present application.

When designing the structural parameters of the square groove 1302b on the inner wall of the sealing cover 1301, the smoothness of the square groove 1302b, the manufacturing material of the sealing cover 1301, the length of the square groove 1302b, the width of the square groove 1302b, the depth of the square groove 1302b and the like all influence the air guiding effect of the inner wall of the sealing cover 1301, wherein the influence of the depth of the square groove 1302b on the air guiding effect is large. If the depth d of the groove 1302b above the inner wall of the sealing cover 1301 is too small, only a small amount of air flow blown onto the inner wall of the sealing cover 1301 can be guided back to the light receiving surface 1100 of the fluorescent wheel 110, and the air guiding effect is poor; if the depth d of the upper groove 1302b of the inner wall of the sealing cover 1301 is too large, the loss of the speed of the air blown onto the inner wall of the sealing cover 1301 is large. Therefore, referring to fig. 12, in the embodiment of the present application, the depth d of the square groove 1302b on the inner wall of the sealing cover 1301 ranges from 1 mm to 3mm, so that the loss of the air velocity blown onto the inner wall of the sealing cover 1301 is small and the air guiding effect is good on the basis of not increasing the manufacturing cost of the sealing cover 1301.

Fig. 13 is a schematic cross-sectional view of a triangular groove 1302c on the inner wall of a sealing cover 1301 in the laser light source 10 according to the embodiment of the present application.

When designing the triangular groove 1302c on the inner wall of the sealing cover 1301, the smoothness of the triangular groove 1302c, the material of the sealing cover 1301, the maximum depth of the square groove 1302b, the inclination of the upper side wall of the square groove 1302b, and the like all have an influence on the air guiding effect of the inner wall of the sealing cover 1301, and the minimum distance L between the triangular groove 1302c and the outer wall of the sealing cover 1301 (i.e., the minimum thickness of the sealing cover 1301) is _min There is a great influence on the structural strength of the sealing cover 1301. If the minimum distance L between the triangular recess 1302c and the outer wall of the sealing cover 1301 _min If the thickness of the sealing cover 1301 is too large, the thickness of the sealing cover 1301 is large to ensure the flow guiding effect of the inner wall of the sealing cover 1301, and the manufacturing cost is high; if the minimum distance L between the triangular recess 1302c and the outer wall of the sealing cover 1301 _min If the size is too small, the structural strength of the seal cover 1301 is low. Therefore, referring to FIG. 13, the minimum distance L between the triangular groove 1302c and the outer wall of the sealing cover 1301 in the embodiment of the present application _min Is 1-1.5 mm, and on the basis of ensuring that the manufacturing cost of the sealing cover 1301 is low and the flow guide effect of the inner wall of the sealing cover 1301 is good, the structural strength of the sealing cover 1301 is reliable. Because the farthest position S of the triangular groove 1302c (the farthest position is the position of the line with the largest depth in the triangular groove 1302 c) is located on the central line of the sealing cover 1301, the farthest position S of the triangular groove 1302c can be determined according to the minimum distance between the triangular groove 1302c and the outer wall of the sealing cover 1301, the farthest position S is connected with the upper endpoint of the fluorescent wheel 110 and the lower endpoint of the fluorescent wheel 110 through straight lines, and the intersection positions of the two straight lines and the flat plate-shaped inner wall of the original sealing cover 1301 are the upper edge position a of the triangular groove 1302c and the lower edge position B of the triangular groove 1302 c. Finally, the size and position of the triangular groove 1302c formed in the flat inner wall of the original seal cover 1301 can be determined according to the farthest position S of the triangular groove 1302c, the upper edge position A of the triangular groove 1302c and the lower edge position B of the triangular groove 1302 c.

In order to increase the heat dissipation effect of the installation housing 130, a plurality of heat dissipation fins 1303 are arranged on the outer wall of the installation housing 130, the plurality of heat dissipation fins 1303 are arranged at intervals, and the heat dissipation fins 1303 can accelerate the heat dissipation of the installation housing 130, so that the heat dissipation efficiency of the fluorescent wheel 110 is indirectly improved.

It should be noted that, since it is considered that the heat on the fluorescence excitation area of the fluorescence wheel 110 is guided to the air guide grooves along with the blades 1101 in a large amount, the heat on the sealing cover 1301 where the air guide grooves are located is high, the heat dissipation fins 1303 with a high density are provided on the sealing cover 1301, and the heat dissipation fins 1303 with a low density are provided in other areas of the outer wall of the mounting housing 130.

For the high-power laser light source 10, the heat dissipation efficiency of the sealing cover 1301 needs to be high. Therefore, in some embodiments of the present application, the laser light source 10 further includes a heat sink installed on an outer wall of the sealing cover 1301, and the heat sink can further improve the heat dissipation efficiency of the sealing cover 1301.

There are various choices of the above-mentioned heat sink, such as a heat pipe heat sink, a TEC (thermal Cooler) cooling fin, or a liquid cooling heat sink.

When the heat pipe radiator operates, the evaporation section of the heat pipe radiator absorbs heat on the sealing cover 1301, so that liquid in the liquid absorption core pipe is boiled into steam, the steam with the heat moves from the evaporation section to the cooling section of the heat pipe radiator, when the steam transmits the heat to the cooling section, the steam is condensed into liquid, the condensed liquid returns to the evaporation section through the capillary action of the liquid absorption core on the pipe wall, and the circulation process is repeated to continuously dissipate the heat. Therefore, the heat pipe radiator has the advantages of high thermal response speed, small volume, light weight, high heat dissipation efficiency, capability of simplifying the heat dissipation design of electronic equipment, no need of an external power supply, no need of special maintenance during working, good isothermal property, safe and reliable operation, no environmental pollution and the like.

The TEC heat spreader is made using the peltier effect of a semiconductor material. The peltier effect means that when a current flows through a couple pair composed of two different semiconductor materials, one end of the couple pair emits heat and the other end absorbs heat, and if the direction in which the current flows is changed, the ends that emit and absorb heat are also exchanged. The TEC radiator can be conveniently applied to small-sized constant temperature equipment, refrigeration equipment, a high-precision temperature control system, and the like, and is suitable for radiating the laser light source 10.

The liquid cooling radiator utilizes the pump to circulate the cooling liquid in the radiating pipe and radiate the heat, and has the advantages of ultra-silence, large heat capacity, slow temperature rise and the like.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

1. A laser light source, comprising:

a laser for providing an illumination source;

the mounting device comprises a mounting shell, a light source and a light source, wherein a mounting cavity is formed in the mounting shell, and the mounting shell is provided with a light inlet communicated with the mounting cavity;

the air guide structure is arranged in the mounting shell;

the light guide structure comprises a light guide structure and a light guide wheel, wherein the light guide structure is arranged in the installation cavity, a fluorescent laser area is arranged on the region, close to the outer edge, of the light guide wheel, a lighting beam emitted by a laser enters the fluorescent laser area of the light guide wheel through a light inlet, a plurality of blades are arranged in the central area of the light guide wheel, are distributed at intervals along the circumferential direction of the light guide wheel and are used for guiding a heat dissipation airflow near the light guide wheel to the light guide structure, and the light guide structure is used for guiding the heat dissipation airflow back to the fluorescent laser area of the light guide wheel.

2. The laser light source of claim 1, wherein the air guide structure is an air guide surface provided on an inner wall of the mounting case, and the air guide surface is provided opposite to an air outlet side of the blade of the fluorescent wheel.

3. The laser light source of claim 2, wherein a portion of an inner wall of the mounting housing opposite to the air outlet side of the blade is provided with an air guide groove, and the air guide surface is a groove wall surface of the air guide groove.

4. The laser light source of claim 3, wherein the air guide groove is an arc groove, a square groove or a triangular groove.

5. The laser light source of claim 4, wherein the air guide groove is an arc-shaped groove, and the radius R of the arc-shaped groove satisfies the following condition: r is 1.2R, and R is the radius of the fluorescent wheel.

6. The laser light source of claim 4, wherein the air guide groove is a square groove, and the depth of the square groove ranges from 1 mm to 3 mm.

7. The laser light source of claim 4, wherein the air guide groove is a triangular groove, and the minimum distance between the triangular groove and the outer wall of the air guide groove is 1-1.5 mm.

8. The laser light source of claim 1, further comprising:

and the plurality of radiating fins are arranged on the outer wall of the mounting shell at intervals.

9. The laser light source of claim 8, further comprising:

and the radiator is arranged on the outer wall of the mounting shell and corresponds to the position of the air guide structure.

10. The laser light source of claim 9, wherein the heat sink is any one of a heat pipe heat sink, a TEC cooling plate, and a liquid cooling heat sink.

11. A laser projection apparatus comprising the laser light source according to any one of claims 1 to 10.

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