Optical engine

Abstract

The present application discloses an optical engine, belonging to the field of projection technology. The optical engine includes: a light source, an optical engine system, and a lens; the light source includes a light source housing, a light-emitting device, and a fluorescent wheel, and the fluorescent wheel includes a fluorescent sheet, a heat sink, a substrate, and a driving component; the light-emitting device and the driving component are fixed inside the light source housing, the substrate is fixedly connected to the rotation axis of the driving component, the heat sink and the fluorescent sheet are sequentially fixed on the substrate, and the light-emitting port of the light-emitting device faces the fluorescent sheet; the light-incident port side of the optical engine system faces the light-emitting port side of the light source housing; the lens is fixed on the light-emitting port side of the optical engine system. In the embodiment of the present application, the heat accumulated on the fluorescent sheet can be transferred to the heat sink for heat dissipation, and at the same time, part of the heat transferred to the heat sink can continue to be transferred to the substrate for heat dissipation, improving the heat dissipation efficiency of the heat on the fluorescent sheet, avoiding the problem of poor transmission imaging effect of the lens, and ensuring the transmission imaging effect of the optical engine.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and particularly relates to an optical engine. Background Art

[0002] With the continuous development of technology, optical engines are increasingly applied in people's work and life, mainly used for emitting light beams to transmit images on a projection screen.

[0003] In related technologies, an optical engine mainly includes a light source, an optical machine system, and a lens. The light source includes a light source housing, a light-emitting device, and a fluorescent wheel. The light-emitting device and the fluorescent wheel are both fixed in the light source housing, and the fluorescent wheel is located on the light-emitting side of the light-emitting device. The fluorescent wheel is used to convert the blue light emitted by the light-emitting device into red light and green light, and reflect it to the optical machine system. The light-incident side of the optical machine system faces the light-emitting side of the light source housing, and is used for modulating the blue light emitted by the light-emitting device and the red light and green light converted by the fluorescent wheel, and emitting the modulated three-color light beams to the lens. The lens is located on the light-emitting side of the optical machine system, and is used for transmitting and imaging the three-color light beams emitted by the optical machine system. Among them, as Figure 1 shown, the fluorescent wheel includes a fluorescent layer 1 for converting the irradiated blue light into red light and green light, a mirror substrate 2 for reflecting the converted red light and green light, and a driving component 3 for driving the mirror substrate to rotate. Among them, the fluorescent layer 1 is fixed on the reflecting surface of the mirror substrate 2, the mirror substrate 2 is fixed on the driving component 3, and the driving component 3 can drive the mirror substrate 2 to rotate.

[0004] In order to ensure high brightness of the transmitted image, a high-energy laser device is used as the light-emitting device. In this way, the fluorescent layer is easily heated by receiving high-energy blue light, and a large amount of heat is accumulated per unit time, resulting in too high a temperature of the fluorescent layer 1, which in turn affects the conversion efficiency of the fluorescent layer 1 for blue light, and thus it is easy to make the red light and green light not meet the requirements, reducing the effect of the transmitted image of the lens. Summary of the Invention

[0005] The present application provides an optical engine, which can avoid the problem of poor imaging effect on the projection screen caused by insufficient red light and green light in the light beam emitted by the light source included in the optical engine. The technical solution is as follows:

[0006] An optical engine, the optical engine includes:

[0007] A light source, the light source includes a light source housing, a light-emitting device, and a fluorescent wheel, and the fluorescent wheel includes a fluorescent sheet, a heat dissipation plate, a substrate, and a driving component;

[0008] The light-emitting device and the driving component are fixed inside the light source housing. The substrate is fixedly connected to the rotating shaft of the driving component. The heat dissipation plate and the fluorescent sheet are sequentially fixed on the substrate. The light-emitting port of the light-emitting device faces the fluorescent sheet, and the fluorescent sheet is used to convert the blue light emitted by the light-emitting device into red light and green light;

[0009] An optical engine system, the light-incident port side of the optical engine system faces the light-emitting port side of the light source housing, and the optical engine system is used to modulate the red light and green light converted by the fluorescent wheel and emit the modulated light beam;

[0010] A lens, the lens is fixed on the light-emitting port side of the optical engine system and is used to receive the light beam modulated by the optical engine system and transmit it for imaging.

[0011] Optionally, the heat dissipation plate has an annular structure, and the heat dissipation plate has heat dissipation holes penetrating through the outer circular surface and the inner circular surface.

[0012] Optionally, between the heat dissipation plate and the fluorescent sheet, and between the heat dissipation plate and the substrate are welded through a welding layer.

[0013] Optionally, the fluorescent wheel further includes a fixed balance block. The substrate is sleeved on the rotating shaft. The fixed balance block is fixedly connected to the rotating shaft, and the substrate is clamped between the fixed balance block and the driving component.

[0014] Optionally, the fixed balance block has a plurality of sawteeth arranged in a circumferential direction.

[0015] Optionally, the plurality of sawteeth are all straight teeth.

[0016] Optionally, the plurality of sawteeth are all helical teeth, and the orientations of the plurality of helical teeth are opposite to the rotation direction of the fluorescent sheet.

[0017] Optionally, the fluorescent wheel further includes a light-transmitting sheet. The fluorescent sheet has a first notch, and at a position corresponding to the first notch on the substrate, there is a second notch. The light-transmitting sheet is fixed on the substrate, and there is an overlapping part between the light-transmitting sheet and the area where the second notch is located.

[0018] Optionally, the fluorescent sheet includes a fluorescent layer, a reflective layer, a solder mask layer, and a welding layer;

[0019] The fluorescent layer, the reflective layer, the solder mask layer, and the welding layer are stacked, and the reflective layer, the solder mask layer, and the welding layer are sequentially formed on the first side surface of the fluorescent layer by electroplating;

[0020] The second side of the fluorescent layer, which is opposite to the first side, faces the light-emitting device, and the welding layer is welded to the heat sink plate.

[0021] Optionally, the fluorescent sheet further includes an antireflection layer, and the antireflection layer is formed on the second side of the fluorescent layer by electroplating.

[0022] The beneficial effects of the technical solution provided by this application can at least include:

[0023] Since the fluorescent sheet, the heat sink plate, and the substrate are fixedly connected, the light beam emitted by the light-emitting device irradiates the fluorescent sheet, and the heat accumulated on the fluorescent sheet can be transferred to the heat sink plate for heat dissipation. Some of the heat transferred to the heat sink plate can continue to be transferred to the substrate for heat dissipation, thereby improving the heat dissipation efficiency of the heat on the fluorescent sheet, ensuring the conversion performance of the fluorescent sheet for blue light, avoiding the problem of poor transmission imaging effect of the lens caused by insufficient conversion of red light and green light, and ensuring the transmission imaging effect of the optical engine. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a schematic structural diagram of a fluorescent wheel provided by the related art;

[0026] Figure 2 is a schematic diagram of the light beam path of a light source provided by an embodiment of this application;

[0027] Figure 3 is a schematic structural diagram of an optical engine provided by an embodiment of this application;

[0028] Figure 4 is a schematic structural diagram of a light source provided by an embodiment of this application;

[0029] Figure 5 is a schematic structural diagram of a fluorescent wheel provided by an embodiment of this application;

[0030] Figure 6 is an exploded structural diagram of a fluorescent wheel provided by an embodiment of this application;

[0031] Figure 7 is an assembled structural diagram of a fluorescent wheel provided by an embodiment of this application;

[0032] Figure 8 is a top view structural diagram of a fluorescent wheel provided by an embodiment of this application;

[0033] Figure 9 is a schematic structural diagram of a fixed balance weight provided by an embodiment of the present application;

[0034] Figure 10 is another schematic structural diagram of a fixed balance weight provided by an embodiment of the present application;

[0035] Figure 11 is a schematic top view structural diagram of another fluorescent wheel provided by an embodiment of the present application;

[0036] Figure 12 is an exploded structural diagram of another fluorescent wheel provided by an embodiment of the present application;

[0037] Figure 13 is a schematic structural diagram of a fluorescent sheet provided by an embodiment of the present application.

[0038] Reference numerals:

[0039] Related art:

[0040] 1: Fluorescent layer; 2: Mirror substrate; 3: Driving component;

[0041] The present application:

[0042] 01: Light source; 02: Optical engine system; 03: Lens;

[0043] 011: Light source housing; 012: Light-emitting device; 013: Fluorescent wheel; 014: Condensing component; 015: Dichroic mirror; 016: Reflector assembly; 017: Color filter; 018: Light homogenizer;

[0044] 0131: Fluorescent sheet; 0132: Heat sink; 0133: Substrate; 0134: Driving component; 0135: Fixed balance weight; 0136: Translucent sheet; 0137: Fixed frame;

[0045] 01311: Fluorescent layer; 01312: Reflective layer; 01313: Solder mask layer; 01314: Welding layer; 01315: Anti-reflection layer;

[0046] 01321: Heat dissipation holes; 01351: Sawteeth. Detailed implementation manners

[0047] To make the objectives, technical solutions, and advantages of the present application clearer, the light source using a fluorescent wheel will be introduced next.

[0048] As Figure 2As shown in the figure, the light source 01 includes a light-emitting device 012, a fluorescence wheel 013, a condenser assembly 014, a dichroic mirror 015, a mirror assembly 016, a color filter 017, and a light homogenizer 018. Among them, the light-emitting device 012, the condenser assembly 014, the dichroic mirror 015, and the fluorescence wheel 013 are arranged in sequence along the same straight line. The light-emitting port of the light-emitting device 012 faces the incident side of the condenser assembly 014, the outgoing side of the condenser assembly 014 faces the transmission surface of the dichroic mirror 015, and the plane where the dichroic mirror 015 is located forms an angle with the center line of the incident light beam. The incident side of the fluorescence wheel 013 faces the reflection surface of the dichroic mirror 015, the incident side of the color filter faces the reflection surface of the dichroic mirror 015 and is located in a direction perpendicular to the same straight line. The incident side of the light homogenizer 018 faces the color filter, and the outgoing side of the light homogenizer 018 is used to face the optical engine system 02. The fluorescence wheel 013 has a transmission area and a reflection area.

[0049] In the actual implementation process, the light-emitting device 012 can be a laser array, and the light-emitting device 012 is used to emit blue light. The emitted blue light is condensed by the condenser assembly 014 and then transmitted through the transmission surface of the dichroic mirror 015 to the fluorescence wheel 013. When the blue light is transmitted to the reflection area on the fluorescence wheel 013, the fluorescence wheel 013 can convert the blue light into red light and green light, and then reflect it to the reflection surface of the dichroic mirror 015 through the reflection area, and then reflect it to the color filter. When the blue light is transmitted to the transmission area on the fluorescence wheel 013, the transmitted blue light can be reflected to the transmission surface of the dichroic mirror 015 under the multiple reflection effects of the mirror assembly 016, and then transmitted to the color filter. Then, for the reflected red light, green light, and blue light, as well as the transmitted blue light, red light, green light, and blue light can be emitted sequentially under the filtering and transmission effects of the color filter. After the output red light, green light, and blue light are homogenized by the light homogenizer 018, they are emitted to the optical engine system 02 sequentially.

[0050] Among them, the dichroic mirror 015 can refer to a color mirror that transmits blue light and reflects red light and green light. The light homogenizer 018 can be a light guide tube or other devices. The light source 01 can also include a first lens assembly and a second lens assembly, and the first lens assembly and the second lens assembly are respectively arranged on the incident side and the outgoing side of the fluorescence wheel 013. Both the first lens assembly and the second lens assembly have the functions of focusing and collimating. In this way, the blue light transmitted through the dichroic mirror 015 can be focused by the first lens assembly before being transmitted to the fluorescence wheel 013 to reduce the area of the light spot irradiated on the fluorescence wheel 013. The red light and green light converted by the fluorescence wheel 013 can be collimated by the first lens assembly to make the light beam parallel. The blue light transmitted through the fluorescence wheel 013 can be collimated by the second lens assembly to achieve parallel emission of the blue light.

[0051] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0052] Figure 3 Schematically illustrates the structure of an optical engine according to an embodiment of the present application. Figure 4 Schematically illustrates the structure of a light source 01 according to an embodiment of the present application. Figure 5 Schematically illustrates the structure of a fluorescent wheel 013 according to an embodiment of the present application. In combination Figure 3 、 Figure 4 and Figure 5 , the optical engine includes: a light source 01, an optical engine system 02, and a lens 03. The light source 01 includes a light source housing 011, a light emitting device 012, and a fluorescent wheel 013. The fluorescent wheel 013 includes a fluorescent sheet 0131, a heat dissipation plate 0132, a substrate 0133, and a driving component 0134. The light emitting device 012 and the driving component 0134 are fixed inside the light source housing 011. The substrate 0133 is fixedly connected to the rotation axis of the driving component 0134. The heat dissipation plate 0132 and the fluorescent sheet 0131 are sequentially fixed on the substrate 0133. The light output port of the light emitting device 012 faces the fluorescent sheet 0131, and the fluorescent sheet 0131 is used to convert the blue light emitted by the light emitting device 012 into red light and green light. The light input port side of the optical engine system 02 faces the light output port side of the light source housing 011. The optical engine system 02 is used to modulate the red light and green light converted by the fluorescent wheel 013 and emit the modulated light beam. The lens 03 is fixed on the light output port side of the optical engine system 02 and is used to receive the light beam modulated by the optical engine system 02 and transmit it for imaging.

[0053] In the embodiment of the present application, since the fluorescent sheet 0131, the heat dissipation plate 0132, and the substrate 0133 are fixedly connected, when the light beam emitted by the light emitting device 012 irradiates the fluorescent sheet 0131, the heat accumulated on the fluorescent sheet 0131 can be transferred to the heat dissipation plate 0132 for heat dissipation, and part of the heat transferred to the heat dissipation plate 0132 can continue to be transferred to the substrate 0133 for heat dissipation. Thus, the heat dissipation efficiency of the heat on the fluorescent sheet 0131 is improved, the conversion performance of the fluorescent sheet 0131 for blue light is ensured, the transmission imaging effect of the lens 03 caused by insufficient conversion of red light and green light is avoided, and the transmission imaging effect of the optical engine is ensured.

[0054] It should be noted that for the above-described fluorescent wheel 013, the fluorescent sheet 0131 can convert all the blue light emitted by the light emitting device 012 into red light and green light. At this time, in order to achieve the emission of a three-color light beam, the light source 01 may further include an additional light emitting device 012, and this additional light emitting device 012 can directly emit blue light to the optical engine system 02 to achieve the sequential emission of red light, green light, and blue light by the light source 01.

[0055] Among them, the light-emitting device 012 can be a laser array, and the light-emitting device 012 is used to emit blue light, that is, the light-emitting device 012 can be a blue laser array. The substrate 0133 can be made of a metal material. In this way, the substrate 0133 can not only dissipate heat through its own radiation, but also achieve heat dissipation through the convection of air during rotation.

[0056] The phosphor sheet 0131, the heat dissipation plate 0132, and the substrate 0133 can all be in a ring structure. Of course, they can also be in other structures, as long as the phosphor sheet 0131 can convert the blue light emitted by the light-emitting device 012 to obtain red light and green light, and the heat transfer between the heat dissipation plate 0132 and the phosphor sheet 0131 can be achieved. The embodiments of the present application do not limit this. For example, Figure 6 or Figure 7 As shown, the phosphor sheet 0131, the heat dissipation plate 0132, and the substrate 0133 are all in a circular ring structure, etc. Of course, the structures of the phosphor sheet 0131, the heat dissipation plate 0132, and the substrate 0133 can also be different, as long as the rapid heat dissipation of the phosphor sheet 0131 can be achieved.

[0057] It should be noted that the size of the phosphor sheet 0131 can be smaller than the size of the heat dissipation plate 0132, and the size of the heat dissipation plate 0132 can be smaller than the size of the substrate 0133, so as to increase the heat transfer area between the phosphor sheet 0131 and the heat dissipation plate 0132, and between the heat dissipation plate 0132 and the substrate 0133; at the same time, since part of the area of the heat dissipation plate 0132 can be exposed, the heat dissipation area of the heat dissipation plate 0132 is increased. Of course, the size of the phosphor sheet 0131 can also be slightly larger than the size of the heat dissipation plate 0132, and the size of the heat dissipation plate 0132 can also be slightly larger than the size of the substrate 0133, as long as the rapid heat dissipation of the heat on the phosphor sheet 0131 can be achieved. The embodiments of the present application do not limit this.

[0058] Among them, the phosphor sheet 0131 and the heat dissipation layer, and between the heat dissipation layer and the substrate 0133 can be fixed by gluing, or can be fixed by mechanical fixing. Of course, the phosphor sheet 0131 and the heat dissipation layer, and between the heat dissipation layer and the substrate 0133 can also be fixed by welding with the welding layer 01314. In this way, due to the metal welding method, the heat transfer efficiency between the phosphor sheet 0131 and the heat dissipation plate 0132, and between the heat dissipation plate 0132 and the substrate 0133 is ensured.

[0059] For example, Figure 7As shown, the substrate 0133, the heat dissipation plate 0132, and the fluorescent sheet 0131 can be sleeved on the positioning posts of the carrying fixture in sequence. Then, the pressing fixture is pressed on the fluorescent sheet 0131 to achieve the pressing between the substrate 0133, the heat dissipation plate 0132, and the fluorescent sheet 0131 through the cooperation of the carrying fixture and the pressing fixture. Then, the pressed substrate 0133, heat dissipation plate 0132, and fluorescent sheet 0131 are placed in a soldering furnace for heating, and thus, when the heating temperature reaches a certain temperature, the soldering between the fluorescent sheet 0131 and the heat dissipation layer, and between the heat dissipation layer and the substrate 0133 can be achieved.

[0060] It should be noted that a soldering layer is provided on the side of the fluorescent sheet 0131 facing the heat dissipation plate 0132, and soldering layers are provided on the side of the heat dissipation plate 0132 facing the fluorescent sheet 0131 and the side facing the substrate 0133, and a soldering layer is provided on the side of the substrate 0133 facing the heat dissipation plate 0132. The embodiments of the present application do not limit this. The soldering layer can be formed by electroplating.

[0061] In some embodiments, as Figure 7 shown, the heat dissipation plate 0132 can be in an annular structure, and the heat dissipation plate 0132 has heat dissipation holes 01321 penetrating the outer circular surface and the inner circular surface. In this way, the heat dissipation area of the heat dissipation plate 0132 can be increased through the heat dissipation holes 01321 on the heat dissipation plate 0132, thereby increasing the heat dissipation effect of the fluorescent sheet 0131.

[0062] Among them, the heat dissipation holes 01321 can be arranged in the radial direction. Of course, the length direction of the heat dissipation holes 01321 can also form a certain angle with the radial direction, as long as the heat dissipation holes 01321 do not penetrate to the upper surface and the lower surface of the heat dissipation layer, so as to ensure the heat transfer area between the heat dissipation plate 0132 and the fluorescent sheet 0131, and to ensure the heat transfer area between the heat dissipation plate 0132 and the substrate 0133. The embodiments of the present application do not limit this.

[0063] It should be noted that a plurality of heat dissipation holes 01321 can be provided on the heat dissipation plate 0132, and the plurality of heat dissipation holes 01321 can be evenly distributed along the circumferential direction of the heat dissipation plate 0132, so as to achieve the overall uniform heat dissipation of the fluorescent sheet 0131 and avoid the phenomenon that the temperature of a part of the fluorescent sheet 0131 is relatively high due to heat accumulation.

[0064] In the embodiments of the present application, the substrate 0133 can be directly fixed on the rotating shaft of the driving component 0134. For example, it can be fixed on the rotating shaft by soldering. Of course, the substrate 0133 can also be fixed on the rotating shaft of the driving component 0134 through a fixing member.

[0065] In some embodiments, as Figure 5 or Figure 6As shown, the fluorescent wheel 013 may further include a fixed balance weight 0135. The substrate 0133 is sleeved on the rotating shaft, and the fixed balance weight 0135 is fixedly connected to the rotating shaft, and the substrate 0133 is clamped between the fixed balance weight 0135 and the driving component 0134. Wherein, the fixed balance weight 0135 may be threadedly connected to the rotating shaft, so that when the fixed balance weight 0135 is tightened, the substrate 0133 is clamped between the fixed balance weight 0135 and the body of the rotating component.

[0066] Wherein, the fixed balance weight 0135 may be a tightening nut. Of course, for the convenience of heat dissipation of the fluorescent sheet 0131, as Figure 8 shown, the fixed balance weight 0135 has a plurality of sawteeth 01351 arranged in the circumferential direction. In this way, when the driving component 0134 drives the fixed balance weight 0135 to rotate, the plurality of sawteeth 01351 on the fixed balance weight 0135 can stir the surrounding air simultaneously, thereby accelerating the flow of the surrounding air and improving the heat dissipation efficiency.

[0067] The tip of each sawtooth 01351 can be designed as a pointed tip, and of course it can also be designed as a rounded corner. The edge of each sawtooth 01351 can be a straight line or an arc, etc., as long as it can stir the surrounding air, and the embodiments of the present application do not limit this.

[0068] In some embodiments, as Figure 9 shown, the plurality of sawteeth 01351 can all be straight teeth; of course, as Figure 10 shown, the plurality of sawteeth 01351 can also be helical teeth.

[0069] Wherein, when the plurality of sawteeth 01351 are all helical teeth, the orientation of the plurality of helical teeth can be opposite to the rotation direction of the fluorescent sheet 0131. Exemplarily, in the process of realizing beam conversion, if the rotation direction of the fluorescent sheet 0131 is clockwise, then the orientation of the plurality of helical teeth is counterclockwise; if the rotation direction of the fluorescent sheet 0131 is counterclockwise, then the orientation of the plurality of helical teeth is clockwise. Since the plurality of sawteeth 01351 can all be helical teeth, and the orientation of the plurality of helical teeth is opposite to the rotation direction of the fluorescent sheet 0131, it can stir the surrounding air more efficiently when the driving component 0134 drives the fixed balance weight 0135 to rotate.

[0070] It should also be noted that for the heat dissipation holes 01321 provided on the heat dissipation plate 0132, the spiral direction of the spiral structure formed by the length direction of the plurality of heat dissipation holes 01321 can be opposite to the rotation direction of the fluorescent sheet 0131 to improve the heat dissipation efficiency of the heat on the heat dissipation plate 0132 along the heat dissipation holes 01321.

[0071] In the embodiments of the present application, when the substrate 0133 is driven to rotate by the driving component 0134, heat will inevitably be generated. Thus, the driving component 0134 can be arranged at a position on the light source housing 011 close to the radiator. Herein, the radiator refers to a device fixed on the outer wall of the light source housing 011 for dissipating heat from the light source housing 011. The radiator can be an air-cooled radiator or a liquid-cooled radiator.

[0072] When the radiator is a liquid-cooled radiator, a part of the liquid-cooled pipeline of the liquid-cooled radiator can be arranged around the body of the driving component 0134 to improve the heat dissipation effect on the driving component 0134.

[0073] The embodiments of the present application also provide another structure of the fluorescent wheel 013. The difference is that, as Figure 11 or Figure 12 shown, the fluorescent wheel 013 further includes a light-transmitting sheet 0136. The fluorescent sheet 0131 has a first notch, and a second notch is provided at a position on the substrate 0133 corresponding to the first notch. The light-transmitting sheet 0136 is fixed on the substrate 0133, and there is an overlapping part between the light-transmitting sheet 0136 and the area where the second notch is located.

[0074] Thus, since the positions of the first notch and the second notch correspond, and there is an overlapping part between the area where the second notch is located and the light-transmitting sheet 0136, it can be considered that there is an overlapping part among the area where the first notch is located, the area where the second notch is located, and the area where the light-transmitting sheet 0136 is located. In this way, the blue light emitted from the light-emitting device 012 can directly irradiate on the light-transmitting sheet 0136, and then directly pass through the substrate 0133 and exit to the optical engine system 02 based on the overlapping part between the light-transmitting sheet 0136 and the area where the second notch is located.

[0075] In order to facilitate the blue light passing through the substrate 0133 to exit to the optical engine system 02, a set of mirror assemblies 016 can also be arranged in the light source housing 011. Then, through the multiple reflection effects of the set of mirror assemblies 016, the direction of the blue light passing through the substrate 0133 is adjusted to exit to the optical engine system 02.

[0076] Among them, as Figure 2 shown, a set of mirror assemblies 016 can include three mirrors, and the included angle between the reflecting surface of each mirror and the center line of the light beam is 45 degrees. Of course, a set of mirror assemblies 016 can also include other numbers of mirrors, and the included angle between the reflecting surface of each mirror and the center line of the light beam can also be different, as long as the direction of the blue light passing through the substrate 0133 can be adjusted to exit to the optical engine system 02 through other numbers of mirrors. The embodiments of the present application do not limit this.

[0077] In some embodiments, as Figure 12As shown, the fluorescent wheel 013 may further include a fixing frame 0137. The fixing frame 0137 is fixed to the area where the second notch is located on the substrate 0133. The light-transmitting sheet 0136 is fixedly connected to the fixing frame, so as to realize the fixed connection between the light-transmitting sheet 0136 and the substrate 0133, and at the same time ensure that there is an overlapping part between the area where the light-transmitting sheet 0136 is located and the area where the second notch is located.

[0078] Among them, the fixing frame 0137 can be fixedly connected to the substrate 0133 by welding. Of course, the fixing frame 0137 and the substrate 0133 can also be fixedly connected by bonding or other means. Then, the light-transmitting sheet 0136 and the fixing frame 0137 can be fixedly connected by bonding. Of course, the light-transmitting sheet 0136 and the fixing frame 0137 can also be fixedly connected by other means.

[0079] It should be noted that in the embodiments of the present application, in addition to realizing the fixed connection between the light-transmitting sheet 0136 and the substrate 0133 through the fixing frame 0137, the light-transmitting sheet 0136 can also be directly fixed to the area where the second notch is located on the substrate 0133 by bonding or other means. The embodiments of the present application do not limit this.

[0080] The embodiments of the present application also provide a fluorescent sheet 0131. As Figure 13 shown, the fluorescent sheet 0131 may include a fluorescent layer 01311, a reflective layer 01312, a solder mask layer 01313, and a soldering layer 01314; the fluorescent layer 01311, the reflective layer 01312, the solder mask layer 01313, and the soldering layer 01314 are stacked, and the reflective layer 01312, the solder mask layer 01313, and the soldering layer 01314 are sequentially formed on the first side of the fluorescent layer 01311 by electroplating; the second side of the fluorescent layer 01311 opposite to the first side faces the light-emitting device 012, and the soldering layer 01314 is soldered to the heat sink 0132.

[0081] Among them, the fluorescent layer 01311 can be a ceramic fluorescent material, a silicone fluorescent material, or a glass fluorescent material. When the fluorescent layer 01311 is a ceramic fluorescent material, it can be obtained by high-temperature sintering of YAG (Y3Al5O10:Ce3+, cerium-doped yttrium aluminum garnet) and a ceramic material. Of course, it can also be a ceramic fluorescent material or a single-crystal fluorescent material made by manufacturing processes such as crystal growth. The thickness of the fluorescent layer 01311 can be in the range of 0.05 mm - 1 mm to ensure the overall thickness of the fluorescent layer 01311. For example, the thickness of the fluorescent layer 01311 can be 0.5 mm.

[0082] The reflective layer 01312 can be a dielectric film or a metal film, and the coating thickness can be in the range of 0.5 μm - 10 μm. The reflective layer 01312 has a high reflectivity for visible light in the wavelength range of 420 nm - 680 nm, thus ensuring the efficiency of visible light in the wavelength range of 420 nm - 680 nm. The visible light in the wavelength range of 420 nm - 680 nm can be red light and green light, and further, the brightness of the red light and green light emitted by the light source 01 can be further improved. Among them, the material of the dielectric film is mainly silicon dioxide, tantalum pentoxide, etc. The material of the metal film can be aluminum, etc.

[0083] The solder mask layer 01313 can be a metal nickel or titanium layer. The solder mask layer 01313 is mainly used to prevent the solder layer 01314 from damaging the reflective layer 01312 in a high-temperature environment, so as to avoid the phenomenon of chemical reaction of the reflective layer 01312. The thickness of the solder mask layer 01313 can be in the range of 0.1 μm - 5 μm. Exemplarily, the thickness of the solder mask layer 01313 can be 2 μm.

[0084] The solder layer 01314 can be a metal solder layer 01314 to ensure the heat transfer efficiency between the phosphor layer 01311 and the heat sink 0132 after welding. Exemplarily, the solder layer 01314 can be a gold layer. The thickness of the solder layer 01314 is in the range of 0.1 μm - 2 μm. Exemplarily, the thickness of the solder layer 01314 is 1 μm.

[0085] In some embodiments, as Figure 13 shown, the phosphor sheet 0131 may further include an anti-reflection layer 01315. The anti-reflection layer 01315 is formed on the second side of the phosphor sheet 0131 by electroplating. In this way, through the setting of the anti-reflection layer 01315, the transmittance of blue light can be increased to improve the utilization efficiency of the light beam, thereby improving the display brightness.

[0086] Among them, the thickness of the anti-reflection layer 01315 is in the range of 0.5 μm - 10 μm. Since the anti-reflection layer 01315 is used to enhance the transmission effect of blue light, the thickness of the anti-reflection layer 01315 can be designed based on the wavelength of blue light in the anti-reflection layer 01315. Exemplarily, the thickness of the anti-reflection layer 01315 can be one-fourth of the wavelength of blue light in the anti-reflection film.

[0087] In the embodiments of the present application, since the fluorescent heat dissipation plate is fixedly connected to the substrate, the light beam emitted by the light-emitting device irradiates the fluorescent sheet, and the heat accumulated on the fluorescent sheet can be transferred to the heat dissipation plate for heat dissipation. At the same time, part of the heat transferred to the heat dissipation plate can also be transferred to the substrate for heat dissipation, thereby improving the heat dissipation efficiency of the heat on the fluorescent sheet, ensuring the conversion performance of the fluorescent sheet, that is, ensuring the brightness of the converted red light and green light. In this way, when the optical engine receives the red light, green light and blue light emitted by the light source in sequence and modulates the red light, green light and blue light and then emits them to the lens, the lens can improve the transmission imaging effect of the lens based on the blue light and the red light and green light with better brightness, ensuring the transmission imaging effect of the optical engine.

[0088] The above are only illustrative embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical engine, characterized in that, The optical engine includes: a light source, the light source including a light source housing, a light emitting device, and a fluorescent wheel, the fluorescent wheel including a fluorescent sheet, a heat dissipation plate, a substrate, and a driving component; the light emitting device and the driving component are fixed within the light source housing, the heat dissipation plate and the fluorescent sheet are sequentially fixed on the substrate, an optical output port of the light emitting device faces the fluorescent sheet, and the fluorescent sheet is configured to convert blue light emitted by the light emitting device into red light and green light; an optical engine system, an incident light port side of the optical engine system faces an optical output port side of the light source housing, and the optical engine system is configured to modulate the red light and green light converted by the fluorescent wheel and emit a modulated light beam; a lens, the lens is fixed on an optical output port side of the optical engine system, and is configured to receive the modulated light beam from the optical engine system and transmit it for imaging; the heat dissipation plate has an annular structure, and the heat dissipation plate has heat dissipation holes penetrating through an outer circular surface and an inner circular surface; a plurality of the heat dissipation holes are provided on the heat dissipation plate, and the plurality of heat dissipation holes are evenly distributed along a circumferential direction of the heat dissipation plate; the fluorescent wheel further includes a fixed balance block, the substrate is sleeved on a rotating shaft of the driving component, the fixed balance block is fixedly connected to the rotating shaft, and the substrate is clamped between the fixed balance block and the driving component; the fixed balance block is located inside the heat dissipation plate and the fluorescent sheet, and the fixed balance block has a plurality of saw teeth arranged along a circumferential direction; 2. The optical engine according to claim 1, wherein, between the heat dissipation plate and the fluorescent sheet, and between the heat dissipation plate and the substrate are welded through a welding layer; 3. The optical engine according to claim 1, characterized in that, the plurality of saw teeth are all straight teeth; 4. The optical engine according to claim 1, characterized in that, the plurality of saw teeth are all helical teeth, and a direction of the plurality of helical teeth is opposite to a rotation direction of the fluorescent sheet; 5. The optical engine according to claim 1, characterized in that, the fluorescent wheel further includes a light transmissive sheet, the fluorescent sheet has a first notch, a position on the substrate corresponding to the first notch has a second notch, the light transmissive sheet is fixed on the substrate, and there is an overlapping portion between the light transmissive sheet and a region where the second notch is located; 6. The optical engine according to claim 1, characterized in that, the fluorescent sheet includes a fluorescent layer, a reflective layer, a solder mask layer, and a welding layer; the fluorescent layer, the reflective layer, the solder mask layer, and the welding layer are stacked, and the reflective layer, the solder mask layer, and the welding layer are sequentially formed on a first side surface of the fluorescent layer by electroplating; a second side surface of the fluorescent layer opposite to the first side surface faces the light emitting device, and the welding layer is welded to the heat dissipation plate; 7. The optical engine according to claim 6, characterized in that, the fluorescent sheet further includes an anti-reflection layer, and the anti-reflection layer is formed on the second side surface of the fluorescent layer by electroplating.

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