CN106468427A - Fluorescent color wheel and wavelength conversion device using same - Google Patents

Abstract

A fluorescent color wheel comprises a first optical unit, a second optical unit and a clamping element. The first optical unit comprises a substrate and an optical layer, wherein the optical layer is arranged on the substrate. The second optical unit is superposed on the optical layer, wherein the optical layer is used for at least reflecting the light beams from the two optical units. The second optical unit comprises a penetrating substrate and a fluorescent layer, wherein the fluorescent layer is arranged on the penetrating substrate. The first optical unit and the second optical unit are fixed through the clamping element.

Description

Fluorescence color wheel and wavelength conversion device using it

technical field

The invention relates to a fluorescent color wheel and a wavelength conversion device using the same.

Background technique

In recent years, optical projectors have been used in many fields. The range of applications for optical projectors is also expanding, ranging from consumer products to high-tech equipment, for example. Various optical projectors are also widely used in schools, homes and commercial occasions to amplify the display pattern provided by the signal source and display it on the projection screen. The light sources used in current optical projectors, such as high-pressure mercury vapor lamps, tungsten-halide lamps, and metal halide lamps, consume high power and have a short lifespan. In addition, the above-mentioned light sources also have relatively large volumes and generate high heat during use.

In order to reduce the high heat generated by power consumption and reduce the size of the device, the light source module of the optical projector can use a solid-state light-emitting element to replace the above-mentioned high-power light source. With the development of optical projectors, laser and fluorescent color wheels can be used in light source modules to provide beams of various wavelengths. In this regard, how to make the fluorescent color wheel in the light source module have better optical efficiency has become one of the important research and development topics at present.

Contents of the invention

In view of this, an embodiment of the present invention provides a wavelength conversion device. In the configuration of the wavelength conversion device, the stacked first optical unit and the second optical unit can be fixed through the sandwich element to form a fluorescent color wheel. At least an air medium layer exists between the second optical unit and the optical layer. Through the air medium layer, the optical layer can have a higher reflection efficiency for the light beam from the second optical unit, especially for a large-angle light beam, so that the light extraction efficiency of the fluorescent color wheel can be correspondingly increased.

An embodiment of the present invention provides a fluorescent color wheel, which includes a first optical unit, a second optical unit, and a clamping element. The first optical unit includes a substrate and an optical layer, wherein the optical layer is disposed on the substrate. The second optical unit is stacked on the optical layer, wherein the optical layer is used to at least reflect the light beam from the second optical unit. The second optical unit includes a transmissive substrate and a fluorescent layer, wherein the fluorescent layer is disposed on the transmissive substrate. The first optical unit and the second optical unit are fixed through the clamping element.

In some embodiments, the transmissive substrate is located between the fluorescent layer and the optical layer.

In some embodiments, the fluorescent layer is located between the transmissive substrate and the optical layer.

In some embodiments, the fluorescent layer provides the second light beam with the second waveband after being excited by the first light beam with the first waveband. The optical layer is used to transmit the first light beam and reflect the second light beam.

In some embodiments, the fluorescent layer provides the second light beam with the second waveband after being excited by the first light beam with the first waveband. The optical layer is used for reflecting the first light beam and the second light beam.

In some embodiments, the second optical unit further includes an anti-reflection layer. The anti-reflection layer and the fluorescent layer are located on opposite sides of the penetrating substrate.

In some embodiments, the optical layer is used to at least reflect light beams with a wavelength range from 460 nanometers (nm) to 700 nanometers (nm).

An embodiment of the present invention provides a fluorescent color wheel, which includes a first optical unit and a second optical unit. The first optical unit includes a substrate and an optical layer, wherein the optical layer is disposed on the substrate. The second optical unit is stacked on the optical layer so that there is at least an air medium layer between the first optical unit and the second optical unit, wherein the optical layer is used to at least reflect light beams from the second optical unit. The second optical unit includes a transmissive substrate and a fluorescent layer, wherein the fluorescent layer is disposed on the transmissive substrate.

In some embodiments, the penetrating substrate or the fluorescent layer of the second optical unit faces the optical layer.

An embodiment of the present invention provides a wavelength conversion device, including an actuating element and a fluorescent color wheel. The actuating element passes through the fluorescent color wheel, and the first optical unit and the second optical unit of the fluorescent color wheel are connected to the actuating element.

Description of drawings

FIG. 1A is a schematic perspective view of a wavelength conversion device according to a first embodiment of the present invention.

FIG. 1B is a schematic cross-sectional view of the fluorescent color wheel of the wavelength conversion device in FIG. 1A , and its cross-sectional position is shown by the line segment B-B' in FIG. 1A .

FIG. 2 is a schematic perspective view of a fluorescent color wheel according to a second embodiment of the present invention, and its cross-sectional position is the same as that in FIG. 1B .

FIG. 3 is a schematic cross-sectional view of a fluorescent color wheel according to a third embodiment of the present invention, and the cross-sectional position is the same as that in FIG. 1B .

FIG. 4 is a schematic cross-sectional view of a fluorescent color wheel according to a fourth embodiment of the present invention, and the cross-sectional position is the same as that in FIG. 1B .

FIG. 5 is a schematic cross-sectional view of a fluorescent color wheel according to a fifth embodiment of the present invention, and the cross-sectional position is the same as that in FIG. 1B .

6A and 6B are schematic diagrams of multiple embodiments in which the wavelength conversion device of the present invention is applied to a light source module.

【Symbol Description】

100 wavelength conversion device

102 Actuating elements

104 fluorescent color wheel

110 first optical unit

112 Substrate

114 optical layer

120 Second optical unit

122 Penetrating Substrate

124 fluorescent layer

125 fluorescent material

126 anti-reflection layer

130 air medium layer

140 Clamping elements

200 light source modules

202 excitation light source

204 light guide unit

206 Light receiving unit

B-B' line segment

L1 first beam

L2 second beam

detailed description

A number of implementations of the present invention will be disclosed below with the accompanying drawings. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some conventional structures and elements will be shown in a simple and schematic way in the drawings.

In order to make the fluorescent color wheel in the wavelength conversion device have better light extraction efficiency, an embodiment of the present invention provides a wavelength conversion device. In the configuration of the wavelength conversion device, the stacked first optical unit and the second optical unit can be fixed through the sandwich element to form a fluorescent color wheel. At least an air medium layer exists between the second optical unit and the optical layer. Through the air medium layer, the optical layer can have higher reflection efficiency for the light beam from the second optical unit, so that the light extraction efficiency of the fluorescent color wheel can be correspondingly increased.

FIG. 1A is a schematic perspective view of a wavelength conversion device 100 according to a first embodiment of the present invention. FIG. 1B is a cross-sectional view of the fluorescent color wheel 104 of the wavelength conversion device 100 in FIG. 1A , and its cross-sectional position is shown by the line segment B-B' in FIG. 1A . The wavelength conversion device 100 includes an actuating element 102 and a fluorescent color wheel 104 . The fluorescent color wheel 104 includes a first optical unit 110 , a second optical unit 120 and a clamping element 140 . The actuating element 102 passes through the fluorescent color wheel 104 , and the first optical unit 110 and the second optical unit 120 of the fluorescent color wheel 104 are connected to the actuating element 102 . In addition, the relative positional relationship between the first optical unit 110 and the second optical unit 120 can be fixed through the clamping element 140 . In this embodiment, the clamping element 140 is a circular ring, but it is not limited thereto. The clamping element 140 can be arranged to surround the rotation axis of the actuating element 102 and be located on both sides of the first optical unit 110 and the second optical unit 120 (that is, on the lower surface of the first optical unit 110 and the second optical unit 120 upper surface) to sandwich the first optical unit 110 and the second optical unit 120 therein.

The first optical unit 110 includes a substrate 112 and an optical layer 114 , wherein the optical layer 114 is disposed on the substrate 112 , and the optical layer 114 may be a dielectric film formed by a multilayer structure. The second optical unit 120 is stacked on the optical layer 114 , wherein the optical layer 114 is used to at least reflect the light beam from the second optical unit 120 . The second optical unit 120 includes a transmissive substrate 122 and a fluorescent layer 124 , wherein the fluorescent layer 124 is disposed on the transmissive substrate 122 . In addition, in this embodiment, the fluorescent layer 124 is located between the transmissive substrate 122 and the optical layer 114 .

The first optical unit 110 may be formed by coating the optical layer 114 on the substrate 112 , and the second optical unit 120 may be formed by coating or coating the fluorescent layer 124 on the transparent substrate 122 . In other words, in the configuration of the fluorescent color wheel 104 , the first optical unit 110 and the second optical unit 120 can be formed separately first, and then the first optical unit 110 and the second optical unit 120 are stacked, and the clamping element 140 fixed. Since the first optical unit 110 and the second optical unit 120 are fixed through the clamping effect provided by the clamping element 140, at least a part of the surfaces facing each other of the first optical unit 110 and the second optical unit 120 can be directly connection or direct contact. In other words, under this configuration, at least the air medium layer 130 exists between the first optical unit 110 and the second optical unit 120 .

In this embodiment, when the optical layer 114 reflects the light beam from the second optical unit 120 , the reflection efficiency of the light beam by the optical layer 114 will vary according to the medium condition of the incident interface of the optical layer 114 . Furthermore, the reflection spectrum of the optical layer 114 will vary with the refractive index of the incident interface. For example, the reflection spectrum of the optical layer 114 at the incident interface with a refractive index of 1 (such as air) is different from the reflection spectrum of the optical layer 114 at the incident interface with a refractive index greater than 1. In addition, when the wavelength range of the incident light of the optical layer 114 falls within the wavelength range of visible light, the reflection efficiency of the optical layer 114 at the incident interface with a refractive index of 1 (such as air) is greater than that of the optical layer 114 at the incident interface. Reflection efficiency at 1. And when the light beam emitted by the second optical unit 120 with a large angle hits the air layer 130 , the light beam with a large angle will be totally reflected to reduce the possibility of touching the optical layer 114 . Furthermore, if there is no air layer 130 , the light beam emitted by the second optical unit 120 with a large angle will be reflected by the optical layer 114 . Since the optical layer 114 composed of a dielectric film is quite difficult to design for large-angle light beams, its reflectivity at large angles will be lower than its reflectivity at small angles, so light rays at large angles will be absorbed by the substrate 112 and reduced. The light extraction efficiency of the fluorescent color wheel 104 .

As mentioned above, under the configuration of this embodiment, at least the air medium layer 130 exists between the first optical unit 110 and the second optical unit 120 . Furthermore, the air medium layer 130 is located between the fluorescent layer 124 and the optical layer 114 . In other words, since the medium on the surface of the optical layer 114 is at least an air medium, the optical layer 114 can have a higher reflection efficiency for the light beam from the second optical unit 120 .

When the fluorescent layer 124 is excited to emit light, the light beam traveling from the fluorescent layer 124 toward the optical layer 114 will be reflected by the optical layer 114 . When the medium on the surface of the optical layer 114 is at least an air medium, the optical layer 114 can have higher reflection efficiency for the light beam from the fluorescent layer 124 , so that the light extraction efficiency of the fluorescent color wheel 104 can be correspondingly increased.

In addition, in this embodiment, when the fluorescent layer 124 is excited by the first light beam L1 with the first wavelength band, the fluorescent layer 124 can generate the second light beam L2 with the second wavelength band. For example, when the fluorescent material 125 of the fluorescent layer 124 is YAG, the first wave band can be between 300 nanometers (nm) and 460 nanometers (nm), and the second wave band can be between 460 nanometers (nm). ) to 700 nanometers (nm) band. Or, the first light beam L1 can be blue light, and the second light beam L2 can be yellow light. The above-mentioned fluorescent material 125, the first wave band and the second wave band are not intended to limit the present invention, and those skilled in the art of the present invention can set the first wave according to the frequency spectrum of the fluorescent material 125 of the selected fluorescent layer 124. band and second band.

The optical layer 114 is used to reflect the first light beam L1 and the second light beam L2 . For example, the optical layer 114 may be a reflective coating, wherein the reflective coating may be made of metal materials such as silver or aluminum. Alternatively, the reflective coating may include a distributed bragg reflector (DBR).

Under this configuration, the first light beam L1 for exciting the fluorescent layer 124 enters the fluorescent color wheel 104 from the side of the second optical unit 120 opposite to the first optical unit 110 . When the first light beam L1 is incident on the fluorescent color wheel 104 , the fluorescent layer 124 is excited by the first light beam L1 to generate the second light beam L2 . Then, the first light beam L1 and the second light beam L2 going toward the optical layer 114 are reflected by the optical layer 114 and go toward the second optical unit 120 . Therefore, the first light beam L1 passing through the second optical unit 120 and reflected from the optical layer 114 may enter the fluorescent layer 124 again and excite the fluorescent material 125 therein.

Through the arrangement of the optical layer 114, the first light beam L1 and the second light beam L2 can be controlled to travel along the direction from the optical layer 114 to pass through the substrate 122, so as to increase the directivity of the light beam provided by the fluorescent color wheel 104, and Make the fluorescent color wheel 104 have higher light extraction efficiency. In addition, in this embodiment, the incident direction of the first light beam L1 entering the fluorescent color wheel 104 and the traveling direction of the second light beam L2 provided by the fluorescent color wheel 104 are opposite to each other. Therefore, the fluorescent color wheel 104 in this embodiment can be regarded as a reflective fluorescent color wheel.

Besides, the substrate 112 of the first optical unit 110 can be, for example, a sapphire substrate, a glass substrate, a borosilicate glass substrate, a float borosilicate glass substrate, a fused quartz substrate or a calcium fluoride substrate. Alternatively, it can also be made of metal, non-metal or ceramic material. The transparent substrate 122 of the second optical unit 120 can be, for example, a sapphire substrate, a glass substrate, a borosilicate glass substrate, a float borosilicate glass substrate, a fused quartz substrate or a calcium fluoride substrate. In addition, in the configuration of the reflective fluorescent color wheel, the penetrating substrate 122 can diffuse the heat generated by the fluorescent layer 124 to its surface, so as to reduce the temperature of the second optical unit 120 .

To sum up, in the configuration of the wavelength conversion device of the present invention, the stacked first optical unit and the second optical unit are fixed through the sandwich element to form a fluorescent color wheel, so at least between the fluorescent layer and the optical layer Air medium is present. Through the air medium, the optical layer can have higher reflection efficiency, so that the light extraction efficiency of the fluorescent color wheel can be increased correspondingly. In addition, the optical layer can control the first light beam and the second light beam to travel along the direction from the optical layer to pass through the substrate, so that the light extraction efficiency of the fluorescent color wheel is further improved.

FIG. 2 is a schematic cross-sectional view of the fluorescent color wheel 104 according to the second embodiment of the present invention, and the cross-sectional position is the same as that in FIG. 1B . The difference between this embodiment and the first embodiment is that the second optical unit 120 of this embodiment further includes an anti-reflection layer 126 . The antireflection layer 126 is disposed on the surface of the transmissive substrate 122 opposite to the fluorescent layer 124 , so that the antireflective layer 126 and the fluorescent layer 124 are located on opposite sides of the transmissive substrate 122 .

In this embodiment, by setting the anti-reflection layer 126 , when the first light beam L1 enters the fluorescent color wheel 104 , the second optical unit 120 can have a lower reflectivity relative to the first light beam L1 . Therefore, the fluorescent layer 124 can be excited by the first light beam L1 more efficiently, thereby increasing the light extraction efficiency of the fluorescent color wheel 104 .

FIG. 3 is a schematic cross-sectional view of the fluorescent color wheel 104 according to the third embodiment of the present invention, and the cross-sectional position is the same as that in FIG. 1B . The difference between this embodiment and the first embodiment is that the optical layer 114 of this embodiment is used to transmit the first light beam L1 and reflect the second light beam L2, wherein the optical layer 114 may be a dichroic coating. , and the dichroic coating can be a multilayer film made of oxide materials.

Similarly, in this embodiment, when the fluorescent material 125 of the fluorescent layer 124 is YAG, the first wavelength band of the first light beam L1 may be a wavelength band between 300 nanometers (nm) and 460 nanometers (nm), and The second wavelength band of the second light beam L2 may be a wavelength band between 460 nanometers (nm) and 700 nanometers (nm). Under the range of the first waveband and the second waveband, since the optical layer 114 is used to at least reflect the light beam from the second optical unit 120, the optical layer 114 can be used to at least reflect the waveband ranging from 460 nanometers (nm) to 700 nm. nanometer (nm) beam. In addition, those skilled in the art to which the present invention pertains can set the first waveband and the second waveband according to the frequency spectrum of the fluorescent material 125 of the fluorescent layer 124 .

Under this configuration, the first light beam L1 for exciting the fluorescent layer 124 enters the fluorescent color wheel 104 from the side of the first optical unit 110 opposite to the second optical unit 120 . That is, the first light beam L1 enters the fluorescent color wheel 104 through the substrate 112 of the first optical unit 110 .

After the first light beam L1 is incident on the fluorescent color wheel 104 , the first light beam L1 can pass through the optical layer 114 and enter into the fluorescent layer 124 . When the fluorescent layer 124 is excited by the first light beam L1, the fluorescent layer 124 will generate the second light beam L2. When the second light beam L2 generated by the fluorescent layer 124 travels toward the optical layer 114, the second light beam L2 traveling toward the optical layer 114 will be reflected by the optical layer 114, so that the light emitting directions of the light beams provided by the fluorescent color wheel 104 can be consistent. . Similarly, since there is at least an air medium layer 130 between the optical layer 114 and the fluorescent layer 124, the optical layer 114 can have a higher reflection efficiency for the second light beam L2 from the fluorescent layer 124, especially the incident light part with a large angle. , so that the light extraction efficiency of the fluorescent color wheel 104 can be correspondingly increased.

In addition, the incident direction of the first light beam L1 entering the fluorescent color wheel 104 is the same as the traveling direction of the second light beam L2 provided by the fluorescent color wheel 104 . Therefore, the fluorescent color wheel 104 in this embodiment can be regarded as a transmissive fluorescent color wheel. In the transmissive fluorescent color wheel, the first wavelength band and the second wavelength band can be selected as independent wavelength bands, so that the optical layer 114 can selectively control the first light beam L1 and the second light beam L2 along the path from the optical layer 114 Pointing to travel in a direction that penetrates the substrate 122 .

FIG. 4 is a schematic cross-sectional view of the fluorescent color wheel 104 according to the fourth embodiment of the present invention, and the cross-sectional position is the same as that in FIG. 1B . The difference between this embodiment and the first embodiment is that the transparent substrate 122 of the second optical unit 120 in this embodiment is located between the fluorescent layer 124 and the optical layer 114 . In addition, the laminated first optical unit 110 and second optical unit 120 are still fixed through the clamping element 140 (see FIG. 1A ), so there will be at least an air medium between the penetrating substrate 122 and the optical layer 114 Layer 130. As mentioned above, under the condition that the medium on the surface of the optical layer 114 is at least an air medium, the optical layer 114 can have higher reflection efficiency for the second light beam L2 from the second optical unit 120 .

In this embodiment, the first light beam L1 used to excite the fluorescent layer 124 enters the fluorescent color wheel 104 from the side of the second optical unit 120 opposite to the first optical unit 110 (that is, the side opposite to the substrate 112 of the first optical unit 110 One side), and the optical layer 114 is used to reflect the first light beam L1 and the second light beam L2. That is, the fluorescent color wheel 104 in this embodiment is a reflective fluorescent color wheel.

In addition, the second optical unit 120 faces the optical layer 114 from the penetrating substrate 122 , wherein the surface of the penetrating substrate 122 facing the optical layer 114 is a relatively flat surface (compared to the fluorescent light in the first to third embodiments). layer facing the surface of the optical layer). As mentioned above, the first light beam L1 passing through the second optical unit 120 and reflected from the optical layer 114 can enter the fluorescent layer 124 again and excite the fluorescent material 125 therein. When the first light beam L1 passes through the second optical unit 120 and is reflected from the optical layer 114, since the interface where the reflected first light beam L1 is incident on the second optical unit 120 is a relatively flat surface, the first light beam L1 does not The light will be reflected back to the optical layer 114 due to light leakage, thereby increasing the transmittance of the first light beam L1 reflected from the optical layer 114 to the second optical unit 120 . In addition, the transmittance of the second light beam L2 reflected from the optical layer 114 to the second optical unit 120 can also be improved due to the same mechanism.

FIG. 5 is a schematic cross-sectional view of the fluorescent color wheel 104 according to the fifth embodiment of the present invention, and the cross-sectional position is the same as that in FIG. 1B . The difference between this embodiment and the fourth embodiment is that the optical layer 114 of this embodiment is used to transmit the first light beam L1 and reflect the second light beam L2. Likewise, the optical layer 114 may be a dichroic coating.

Under this configuration, the fluorescent color wheel 104 of this embodiment is a transmissive fluorescent color wheel, and the first light beam L1 used to excite the fluorescent layer 124 is from the side of the first optical unit 110 opposite to the second optical unit 120 Enter the fluorescent color wheel 104 . That is, the first light beam L1 enters the fluorescent color wheel 104 through the substrate 112 of the first optical unit 110 . As mentioned above, since the first wavelength band of the first light beam L1 and the second wavelength band of the second light beam L2 can be selected to be independent of each other, the optical layer 114 can selectively control the first light beam L1 and the second light beam L1. L2 travels in a direction directed from the optical layer 114 through the substrate 122 .

Similarly, the light extraction efficiency of the fluorescent color wheel 104 can be improved through the existence of the air medium layer 130, and the transmittance of the first light beam L1 and the second light beam L2 reflected from the optical layer 114 to the second optical unit 120 can also be improved. Lifting is achieved by penetrating the relatively flat surface of the substrate 122 towards the optical layer 114 .

6A and 6B are schematic diagrams of multiple embodiments in which the wavelength conversion device 100 of the present invention is applied to the light source module 200 . The light source module 200 includes a wavelength conversion device 100 , an excitation light source 202 , a light guiding unit 204 and a light receiving unit 206 . The wavelength conversion device 100 includes an actuating element 102 and a fluorescent color wheel 104 , wherein the fluorescent color wheel of the wavelength conversion device 100 in FIG. 6A is reflective, and the fluorescent color wheel of the wavelength conversion device 100 in FIG. 6B is transmissive.

The excitation light source 202 is used to excite the fluorescent color wheel 104 of the wavelength conversion device 100 . The light guiding unit 204 is used to guide the first light beam L1 and the second light beam L2 to the light receiving unit 206 . The light receiving unit 206 is used to receive the first light beam L1 and the second light beam L2, and guide the first light beam L1 and the second light beam L2 to an external component (not shown). External components such as dichroic color wheels. As mentioned above, since the fluorescent color wheel 104 of the wavelength conversion device 100 of the present invention can pass through the air medium layer 130 (see FIG. 1B ) to improve the light extraction efficiency, the light output efficiency of the light source module 200 using the wavelength conversion device 100 It can also be increased accordingly.

In addition, in the configuration of the reflective fluorescent color wheel, the light guide unit 204 can be used to guide the first light beam L1 passing through the fluorescent color wheel 104, so that the first light beam L1 passing through the fluorescent color wheel 104 can still be guided to the middle of the light-receiving unit 206 .

To sum up, in the configuration of the wavelength conversion device of the present invention, the laminated first optical unit and the second optical unit are fixed through the clamping element to form a fluorescent color wheel, so the distance between the second optical unit and the optical layer There is at least an air medium layer between them. Through the air medium layer, the optical layer can have higher reflection efficiency for the light beam from the second optical unit, so that the light extraction efficiency of the fluorescent color wheel can be correspondingly increased. In addition, the fluorescent color wheel of the wavelength conversion device of the present invention includes reflective and transmissive, therefore, the light source module using the wavelength conversion device of the present invention can have more flexible element configuration.

Although the present invention has been disclosed above in various embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, The scope of protection of the present invention should be defined by the appended claims.

Claims (10)

1. Fluorescent color wheel, including: A first optical unit, comprising: a substrate; and an optical layer disposed on the substrate; and A second optical unit is stacked on the optical layer, wherein the optical layer is used to at least reflect light beams from the second optical unit, and the second optical unit includes: - penetrating the substrate; and A fluorescent layer is arranged on the transparent substrate. A clamping element, the first optical unit and the second optical unit are fixed through the clamping element. 2. The fluorescent color wheel according to claim 1, wherein the transmissive substrate is located between the fluorescent layer and the optical layer. 3. The fluorescent color wheel according to claim 1, wherein the fluorescent layer is located between the transmissive substrate and the optical layer. 4. The fluorescent color wheel according to claim 2 or 3, wherein the fluorescent layer is excited by a first light beam with a first wavelength band to provide a second light beam with a second wavelength band, and the optical layer is used to make The first light beam penetrates and reflects the second light beam. 5. The fluorescent color wheel according to claim 2 or 3, wherein the fluorescent layer is excited by a first light beam with a first wavelength band to provide a second light beam with a second wavelength band, and the optical layer is used to make The first light beam is reflected from the second light beam. 6. The fluorescent color wheel according to claim 3, wherein the second optical unit further comprises an anti-reflection layer, and the anti-reflection layer and the fluorescent layer are located on opposite sides of the transmissive substrate. 7 . The fluorescent color wheel according to claim 1 , wherein the optical layer is used to at least reflect light beams in a wavelength range from 460 nm to 700 nm. 8. Fluorescent color wheel, including: A first optical unit, comprising: a substrate; and an optical layer disposed on the substrate; and A second optical unit stacked on the optical layer so that there is at least an air medium layer between the first optical unit and the second optical unit, and the optical layer is used to at least reflect the light beam from the second optical unit , the second optical unit contains: - penetrating the substrate; and A fluorescent layer is arranged on the transparent substrate. 9. The fluorescent color wheel according to claim 8, wherein the transmissive substrate or the fluorescent layer of the second optical unit faces the optical layer. 10. Long conversion device, comprising: an actuating element; and The fluorescent color wheel according to any one of claims 1-9, wherein the actuating element passes through the fluorescent color wheel, and the first optical unit and the second optical unit are connected to the actuating element.