CN110658668B

CN110658668B - Fluorescent wheel device and projection display system

Info

Publication number: CN110658668B
Application number: CN201810695627.1A
Authority: CN
Inventors: 邢哲
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2022-02-01
Anticipated expiration: 2038-06-29
Also published as: CN110658668A

Abstract

The invention provides a fluorescent wheel device and a projection display system, wherein the fluorescent wheel device comprises a substrate, wherein the substrate is fixed on a rotating shaft and driven to rotate; and a magnetic fan arranged in parallel with the substrate; the substrate comprises a light processing area and a non-light processing area, wherein the light processing area receives irradiation of laser excitation light, and the non-light processing area is provided with a magnetic component. The device is provided with the magnetic component in the non-light processing area of the substrate, and the magnetic fan is arranged in a position parallel to the substrate, so that the magnetic component can generate an alternating magnetic field in the rotating process along with the substrate to attract the magnetic fan to rotate along with the magnetic component, the rotating magnetic fan can promote the air in the shell to flow, the heat exchange efficiency of the air and the shell is enhanced, and the heat dissipation effect of the fluorescent wheel structure in a closed environment is effectively enhanced.

Description

Fluorescent wheel device and projection display system

Technical Field

The present disclosure relates to the field of projector technologies, and in particular, to a fluorescent wheel device and a projection display system.

Background

At present, fluorescent light sources have a wide application in projectors. The laser is used as an excitation light source of the fluorescent light source, and can excite the fluorescent material to generate tricolor light required by image display. The excitation light source and the fluorescent light source have different wavelengths, and thus, the device for realizing wavelength conversion is called a wavelength conversion device, i.e., a fluorescent wheel, in the projector.

The fluorescent wheel is usually designed to be a closed structure to prevent dust from adhering to the fluorescent wheel to affect the luminous efficiency of the fluorescent material. Referring to fig. 1, a conventional fluorescent wheel is shown. As can be seen from fig. 1, the fluorescent wheel comprises a housing 10 and a substrate 20 disposed inside the housing 10, wherein the substrate 20 comprises a light treatment region 21 and a non-light treatment region 22 inside the light treatment region 21 on the circumference. The light processing area 21 is provided with at least one color of fluorescent powder, when the projector works, the light beam emitted by the semiconductor laser irradiates on the fluorescent powder of the rotating fluorescent wheel, and the fluorescent powder is excited to form light with corresponding color.

Fluorescent material can produce a large amount of heats in the stimulated emission, under the closed environment, the radiating mode through natural convection can't be in time, effectual with the heat effluvium, leads to fluorescent wheel internal temperature too high, can reduce fluorescent wheel's life on the one hand, and then influences whole projector's life, and on the other hand also can reduce fluorescent material's conversion efficiency, influences light source luminance.

Disclosure of Invention

The embodiment of the invention provides a fluorescent wheel device and a projection display system, and aims to solve the technical problem that the temperature of a fluorescent wheel in a closed environment is too high in the prior art.

In a first aspect, the present application provides a fluorescent wheel apparatus comprising:

the base plate is fixed on the rotating shaft and driven to rotate;

and a magnetic fan arranged in parallel with the substrate;

the substrate comprises a light processing area and a non-light processing area, wherein the light processing area receives irradiation of laser excitation light, and the non-light processing area is provided with a magnetic component.

In a second aspect, the present application provides a projection display system comprising a fluorescent wheel arrangement as described above.

The beneficial effect of this application is as follows:

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention 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, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic diagram of a conventional fluorescent wheel;

FIG. 2 is a schematic structural diagram of a fluorescent wheel device according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a substrate according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a reflective fluorescent wheel device according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a transmission-type fluorescent wheel device according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a projection display system according to an embodiment of the present disclosure;

fig. 7 is a schematic view of a two-color laser light source according to an embodiment of the present disclosure.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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 invention.

To the technical problem that the temperature of a fluorescent wheel is too high in the prior art and in a closed environment, the application provides a fluorescent wheel device and a projection display system, and the core idea is as follows: the magnetic component is arranged in the non-light processing area of the substrate, and the magnetic fan is arranged in a position parallel to the substrate, so that in the process that the magnetic component rotates along with the substrate, an alternating magnetic field can be generated to attract the magnetic fan to rotate along with the magnetic component, the rotating magnetic fan can promote air flow in the shell, the heat exchange efficiency of the air and the shell is enhanced, and the heat dissipation effect of the fluorescent wheel structure in a closed environment is effectively enhanced. The present application is further described with reference to the following detailed description and the accompanying drawings.

Referring to fig. 2 and fig. 3, a schematic structural diagram of a fluorescent wheel device according to an embodiment of the present application and a schematic structural diagram of a substrate according to an embodiment of the present application are shown, respectively. As can be seen from fig. 2 and 3, the present fluorescence wheel apparatus includes: the housing 10, the housing 10 is a sealed metal housing. Inside the housing 10, there are provided an optical conversion module including a substrate 20 and a rotation shaft 41, and a heat sink. The substrate 20 has a generally circular configuration, and depending on the function, the substrate 20 may be divided into a light processing region 21 that receives the laser excitation light and a non-light processing region 22 (i.e., a portion of the substrate 20 other than the light processing region 21) that is provided with a magnetic member. The light processing area 21 and the non-light processing area 22 are arranged from inside to outside along the radial direction of the substrate 20, and the non-light processing area 22 and the light processing area 21 are not overlapped. At least one phosphor is disposed in the light processing region 21 of the substrate 20, and the phosphor can emit fluorescent light of a corresponding color under the irradiation of the laser light source, so as to provide a fluorescent light source for the projection display system. Since the process of exciting the fluorescence by the laser irradiation phosphor is a strong heat release process, the substrate 20 is easily damaged by the phosphor excited at a fixed position for a long time due to an excessively high temperature, and therefore, the substrate 20 needs to rotate along with the rotating shaft 41 under the action of external driving so as to change the excitation position of the laser light source.

The heat dissipation assembly includes a fixing shaft 42 and a magnetic fan 30 disposed parallel to the base plate 20, wherein the magnetic fan 30 is connected to the housing 10 through the fixing shaft 42. The fixed shaft 42 and the housing 10 may be connected by a conventional connection method such as a screw connection. The magnetic fan 30 is movably connected with the fixed shaft 42, and the magnetic fan 30 can rotate around the fixed shaft 42. In this embodiment, the magnetic fan 30 is made of a magnetic material, or a part of the magnetic fan 30 is made of a magnetic material.

In this application, the substrate 20 is further provided with a magnetic component 23, and the magnetic component 23 is specifically disposed in the non-optical processing region 22 to avoid blocking the laser light path or the fluorescence light path and affecting the light conversion process of the fluorescence wheel structure. The magnetic fan 30 is disposed opposite to the magnetic component 23, and the magnetic component 23 continuously changes the magnetic field during the rotation process, so that the magnetic force (attraction and thrust) generated to the magnetic fan 30 changes accordingly, thereby driving the magnetic fan 30 to rotate along with the rotation of the magnetic component 23, and further promoting the air flow inside the housing 10.

The conventional electrically driven fan requires a driving means to be provided, and since the space inside the casing 10 is limited, the driving means generally needs to be disposed outside the casing 10 and electrically connected to the fan through a bearing penetrating the sidewall of the casing 10. Such an arrangement increases the difficulty of sealing the housing 10, and dust is likely to enter the joint between the bearing and the housing 10, which leads to a decrease in the light conversion efficiency of the fluorescent wheel structure. In the present application, the rotation driving force generated by the magnetic fan 30 is completely from the magnetic component 23, and a driving device is not required to be configured separately, so that the adverse effect on the sealing performance of the housing 10 can be effectively avoided while the power consumption is saved.

In the fluorescent wheel device provided by the application, the magnetic component 23 is arranged in the non-light processing area 22 of the substrate 20, and the magnetic fan 30 is arranged at the relative position of the magnetic component 23, so that in the process that the magnetic component 23 rotates along with the substrate, a magnetic field which changes alternately can be generated to attract the magnetic fan 30 to rotate along with the magnetic component, the rotating magnetic fan 30 can promote the air flow in the shell, the heat exchange efficiency of the air and the shell is enhanced, and the heat dissipation effect of the fluorescent wheel structure in a closed environment is effectively enhanced.

At present, a fluorescent wheel can be generally divided into a reflective fluorescent wheel and a transmissive fluorescent wheel, wherein a substrate 20 of the reflective fluorescent wheel is a metal mirror substrate, the metal mirror substrate can be made of metal aluminum or metal copper, fluorescent powder is attached to the metal substrate, fluorescent powder generated by excitation of laser can be reflected on the metal substrate, and the optical path of the fluorescent light in the reflective fluorescent wheel is opposite to that of the laser; the substrate 20 of the transmission type fluorescent wheel is generally a glass substrate, and the fluorescent powder is attached to the glass substrate, and the fluorescent powder generated by the excitation of the laser light can be diffused in the direction of 360 degrees through the glass substrate, but since the intensity of the fluorescent light generated at the laser irradiation position is high, the intensity of the fluorescent light diffused out with the laser irradiation position as the center is weak and the collection difficulty is large, in practical application, only the fluorescent light generated at the laser irradiation position is used as the light source of the projection display system.

Referring to fig. 4, a schematic structural diagram of a reflection-type fluorescent wheel device according to an embodiment of the present application is shown. In this embodiment, the substrate 20 is an aluminum substrate, as can be seen from fig. 4, the substrate 20 is fixed on one side wall of the housing 10 of the fluorescent wheel device, a third optical window 53 is opened on a side wall opposite to the side wall, laser (indicated by a solid arrow) emitted by the laser source irradiates phosphor on the light processing region 21 through the third optical window 53, and fluorescence (indicated by a dotted arrow) generated by the excited phosphor exits the fluorescent wheel device through the third optical window 53. The diameter of the common substrate 20 is usually about 60mm, while the laser has strong collimation property, and the diameter of the light beam is usually only about 2mm, therefore, the size of the third optical window 53 is designed to be slightly larger than the laser light beam. Therefore, in the fluorescent wheel device, the space occupied by the light path formed by the laser-fluorescence is very limited, so that the design space of the magnetic fan 30 in the housing 10 is very sufficient on the premise of not shielding the laser-fluorescence light path, and the number and size of the fan blades of the magnetic fan 30 can be designed according to actual requirements.

In combination with the structural features of the reflective fluorescent wheel device, this embodiment is taken as a preferred embodiment, the rotating shaft 41 and the fixed shaft 42 are fixed on the same side of the base plate 20, that is, the magnetic fan 30 and the base plate 20 are fixed on the same side wall of the housing 10, and the third light window 53 is fixed on the opposite side wall. Since there is no light on the back surface of the substrate 20 in the reflective fluorescent wheel device provided in this embodiment, the magnetic fan 30 has more design space.

Of course, in other embodiments of the present application, the magnetic fan 30 may also be fixed on the same side wall as the third optical window 53, and such a design manner that there is no overlapping area between the magnetic fan 30 and the optical path formed by the laser and the fluorescence, that is, the magnetic fan 30 needs to avoid the laser-fluorescence optical path, so that the magnetic fan 30 is inevitably limited in the design space, but because the magnetic fan 30 faces the light processing area 21 on the substrate 20 and there is no shielding object between the two, when the magnetic fan 30 rotates to generate air convection, it is more beneficial to transfer the heat at the laser irradiation position in the light processing area 21 to the housing 10, thereby enhancing the heat dissipation of the light processing area 21.

Of course, in order to fully utilize the energy of the laser light source, in some reflective fluorescent wheels, the substrate 20 is divided into a light conversion area and a non-light processing area 22, wherein the light conversion area is disposed on the outer circumference of the substrate 20, the light conversion area includes a light processing area and a transmission area, the light processing area functions similarly to the present embodiment, the transmission area is usually made of glass material and is used for transmitting the laser light during the rotation of the substrate 20, the transmitted laser light can exit the fluorescent wheel device through a fourth optical window disposed opposite to the third optical window 53 after passing through the substrate 20, and the emitted laser light can be combined with the fluorescent light through an optical axis conversion circuit. In the above application scenario, the magnetic fan 30 should be disposed to avoid the third optical window 53 and the fourth optical window.

In general, the projected area of the magnetic fan in the non-light processing region is smaller than or equal to the non-light processing region in consideration of space limitations and the intensity of the driving force provided by the magnetic member 23. When the relative area between the magnetic fan 30 and the magnetic component 23 is maximized, the magnetic force between the magnetic fan 30 and the magnetic component 23 is strongest, the magnetic component 23 has the best driving effect on the magnetic fan 30, and one way to maximize the relative area between the magnetic fan 30 and the magnetic component 23 is to make the number, the installation position and the size of the fan blades of the magnetic fan 30 correspond to those of the magnetic component 23. For this purpose, in the present embodiment, the rotating shaft 41 and the fixed shaft 42 are coaxially disposed, and the magnetic fan 30 has the same number of blades with the same size as the magnetic members 23. Since the magnetic fan 30 includes at least two blades, in this embodiment, the fluorescent wheel structure should also be provided with a plurality of magnetic components 23. In addition, in the present embodiment, the rotating shaft 41 and the fixed shaft 42 are coaxially disposed, specifically, the central axis of the rotating shaft 41 and the central axis of the fixed shaft 42 coincide in a direction perpendicular to the side wall.

In order to ensure that the rotating shaft 41 and the fixed shaft 42 can be coaxially disposed and the rotating shaft 41 and the fixed shaft 42 are not affected by each other, in this embodiment, a bracket 60 is further mounted on a side wall on which the fixed shaft 42 is mounted, the bracket 60 is Z-shaped and includes two horizontally disposed fixed end surfaces, one of the fixed end surfaces is used for connecting a side wall of the housing and providing a spatial distance for disposing the magnetic fan 30 and the base plate 20, and the other fixed end surface is used for mounting a driving member 70 for providing a rotational driving force for the base plate 20, and the driving member 70 is connected with the base plate 20 through the rotating shaft 41. Through the design of the above bracket 60, not only can a precondition be provided for maximizing the relative area of the magnetic fan 30 and the magnetic component 23, but also the limited space condition in the housing 10 can be further utilized reasonably.

Of course, in other embodiments of the present application, the magnetic component 23 may also be a magnetic block with magnetism. In order to be able to generate an alternating magnetic field, the magnet block cannot be designed in a closed ring shape. In other embodiments of the present application, the rotating shaft 41 and the fixed shaft 42 may be configured to be non-coaxial, as long as the magnetic fan 30 is ensured to rotate under the driving of the magnetic component 23.

The substrate 20 needs to maintain a good balance during the rotation to prevent the excited fluorescence from deviating from the predetermined emission light path and affecting the fluorescence conversion efficiency. Therefore, in order to correspond to the arrangement of the fan blades and not affect the balance performance of the substrate 20 during rotation, the plurality of magnetic members 23 may be spaced along the circumference of the rotating shaft 41, and the spacing distance and the angle between two adjacent magnetic members 23 are the same. Two weight members for adjusting the balance performance of the substrate 20 during rotation are symmetrically disposed about the rotation axis 41 in the non-light processing region 22 of the substrate 20. In order to fully utilize the internal structure of the base plate 20 without destroying the original design of the base plate 20, the present embodiment may design the weight member as a magnetic material or design a part of the weight member as a magnetic material to serve as the magnetic member 23 of the present embodiment.

In addition, in order to avoid the interference of other magnetic components on the rotation of the magnetic fan 30, in this embodiment, all other components including the housing 10 should be made of non-magnetic materials, and in this embodiment, the housing 10 may be a sealed housing made of metal such as aluminum, copper, and the like.

In correspondence with the reflective fluorescent wheel embodiments described above, the present application also provides embodiments directed to transmissive fluorescent wheels. Referring to fig. 5, a schematic structural diagram of a transmission type fluorescent wheel device according to an embodiment of the present application is shown. In this embodiment, the substrate 20 is a glass substrate, as can be seen from fig. 5, the housing 10 is further provided with a first optical window 51 and a second optical window 52 which are opposite to each other, the light processing region 21 on the substrate 20 is arranged opposite to the first optical window 51, laser (indicated by a solid arrow) emitted by the laser source can irradiate phosphor on the light processing region 21 through the first optical window 51, and because the first optical window 51 and the second optical window 52 are arranged opposite to each other, most of fluorescent light (indicated by a dotted arrow) generated by the excited phosphor can exit the fluorescent wheel device through the second optical window 52. Since the laser has strong collimation and the beam diameter is usually only about 2mm, the first optical window 51 and the second optical window 52 are designed to be slightly larger than the laser beam, similar to the third optical window 53.

In the above application scenario, since there are light rays on both sides of the substrate 20, no matter the magnetic fan 30 and the substrate 20 are disposed on the same side wall or on the opposite side wall, the magnetic fan 30 needs to avoid the laser-fluorescence light path, and there is no overlapping area between the magnetic fan 30 and the light path formed by the laser and the fluorescence, so as to avoid affecting the light conversion efficiency of the fluorescence wheel structure.

The fluorescent wheel structure provided by the application is provided with a light conversion component formed by a substrate 20, a rotating shaft 41, a driving part 70 and the like, and a heat radiation component formed by a fixed shaft 42, a magnetic fan 30 and the like. The magnetic fan 30 is closely matched with the substrate 20 in the arrangement position and the working principle, on the premise of not influencing the fluorescence excitation efficiency, the self rotary motion of the substrate 20 is fully utilized, a magnetic field which changes alternately is generated through the magnetic part 23 arranged on the substrate 20, so that the magnetic fan 30 is driven to operate, the air circulation and the flow inside the shell are promoted, the heat exchange efficiency of the air and the shell is enhanced, and the heat dissipation effect of the fluorescent wheel structure under the closed environment is further enhanced. In addition, since the magnetic fan 30 is driven passively without an external driving device, all components included in the fluorescent wheel structure are disposed inside the housing 10, which is beneficial to enhancing the sealing performance of the fluorescent wheel structure.

Based on the fluorescent wheel device, the application also provides a projection display system which can comprise any one of the fluorescent wheel devices. The projection display system according to the present embodiment will be described below by taking a reflective luminescent wheel device as an example. Fig. 6 is a schematic structural diagram of a projection display system according to an embodiment of the present disclosure. As shown in fig. 6, the system includes an excitation light source 11, a converging lens group 12 located in the light emitting direction of the excitation light source 11, a light combining unit 13 (such as a dichroic mirror) located in the light emitting direction of the converging lens group 12 and forming an angle of 45 degrees with the light emitting direction, a fluorescent wheel device 2 located in the light emitting direction of the light combining unit 13, a first collimating lens group 15 and a second collimating lens group 16 located on the front and the back of the fluorescent wheel device 2, respectively, a color filter wheel 17 located on one side of the light combining unit 13 and perpendicular to the light emitting direction of the excitation light source 11, a converging lens 18 located between the color filter wheel 17 and the light combining unit 13, a relay loop 19 located around the fluorescent wheel 14, and a display screen 80 located in the light emitting direction of the color filter wheel 17.

The laser emitted from the excitation light source 11 is converged and collimated, and then emitted into the fluorescent wheel device 2, during the rotation of the fluorescent wheel device 2, a part of the laser irradiates on the fluorescent powder, the fluorescent light generated by the excited fluorescent material is emitted in the direction opposite to the direction of the laser incidence, the other part of the laser directly penetrates through the fluorescent wheel device 2 and is emitted in the incidence direction, the transmitted laser is mixed with the fluorescent light at the light combining unit 13 through the relay loop 19, and the light source is provided for the display screen 80 after passing through the color filter wheel 17.

The embodiment of the application also provides a bicolor laser light source. Referring to fig. 7, a schematic diagram of a two-color laser light source structure according to an embodiment of the present application is shown. As can be seen from fig. 7, the blue light emitted from the blue laser 110 enters the fluorescent wheel device 2 through the first telescope beam-reducing system 130, and is converted into blue light and green light by the fluorescent wheel device 2 to be emitted; the red light emitted from the red laser 120 passes through the second telescope beam-reducing system 140 and the first diffusion sheet 310, is combined with the blue light and the green light at the light-combining mirror 400, and is output, and then enters the light rod 500 through the second diffusion sheet 320 and the focusing lens 510.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

The foregoing is merely a detailed description of the invention, and it should be noted that modifications and adaptations by those skilled in the art may be made without departing from the principles of the invention, and should be considered as within the scope of the invention.

Claims

1. A fluorescent wheel apparatus, comprising:

the base plate is fixed on the rotating shaft and driven to rotate;

and a magnetic fan disposed in parallel with the substrate;

2. The fluorescent wheel assembly of claim 1, wherein the non-light treated region and the light treated region are arranged from inside to outside along a radial direction of the substrate, and the non-light treated region and the light treated region do not overlap.

3. The fluorescent wheel apparatus of claim 1, further comprising a housing, the base plate and the magnetic fan being sealed inside the housing.

4. The fluorescent wheel apparatus of claim 1, wherein the projected area of the magnetic fan at the non-light treated region is less than or equal to the non-light treated region.

5. The fluorescent wheel apparatus of claim 3, wherein the base plate is a metal base plate, the magnetic fan is connected to the housing through a fixed shaft, the magnetic fan can rotate around the fixed shaft, and the rotating shaft and the fixed shaft are fixed on the same side of the base plate.

6. The fluorescent wheel apparatus of claim 1, wherein the magnetic member is a weight member disposed symmetrically with respect to the rotation axis on the base plate.

7. The fluorescent wheel device of claim 3, wherein the substrate is a transparent non-metallic substrate, the housing further has a first optical window and a second optical window opposite to each other, the first optical window can be used for emitting laser light from the laser light source to irradiate the phosphor powder on the light processing region, and the second optical window can be used for emitting the fluorescence generated by the excited phosphor powder out of the fluorescent wheel device.

8. The fluorescent wheel apparatus of claim 3, further comprising a bracket fixed inside the housing, wherein a driving member is fixedly mounted on the bracket, and the driving member is connected to the rotating shaft.

9. The fluorescent wheel apparatus of claim 3, wherein the housing is a non-magnetic material.

10. A projection display system comprising a fluorescent wheel device according to any of claims 1-9.