CN111221210B - Wavelength conversion mechanism, projection apparatus, and fluorescence excitation method - Google Patents
Wavelength conversion mechanism, projection apparatus, and fluorescence excitation method Download PDFInfo
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- CN111221210B CN111221210B CN202010050204.1A CN202010050204A CN111221210B CN 111221210 B CN111221210 B CN 111221210B CN 202010050204 A CN202010050204 A CN 202010050204A CN 111221210 B CN111221210 B CN 111221210B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
Abstract
The invention provides a wavelength conversion mechanism, a projection device and a fluorescence excitation method, relating to the technical field of projection devices, wherein the wavelength conversion mechanism comprises a wavelength conversion body coated with a wavelength conversion material; the wavelength conversion body is provided with a first rotational degree of freedom and a second rotational degree of freedom, and an included angle is formed between the axis of the first rotational degree of freedom and the axis of the second rotational degree of freedom; the wavelength converting body is configured to rotate in the first rotational degree of freedom and the second rotational degree of freedom to change a position at which incident light strikes the wavelength converting body. The wavelength conversion mechanism provided by the invention can reduce the illumination time length of a single-point position so as to avoid overhigh temperature of the wavelength conversion mechanism.
Description
Technical Field
The invention relates to the technical field of projection devices, in particular to a wavelength conversion mechanism, a projection device and a fluorescence excitation method.
Background
When the disk-shaped fluorescent wheel is subjected to light treatment, fluorescent powder is coated on the surface of the fluorescent wheel, and blue laser is irradiated on the surface of the fluorescent wheel. The light is converted by rotating the fluorescent wheel around itself. The wavelength conversion layer is only coated on the disc surface for a circle, the light irradiation time interval of the single-point position of the wavelength conversion layer is short, the temperature of the wavelength conversion layer is rapidly increased after the wavelength conversion layer is irradiated by light, the conversion efficiency of the wavelength conversion layer in a high-temperature state is reduced, a heat dissipation device needs to be additionally arranged to cool the fluorescent wheel, and the structure of the fluorescent mechanism is complicated.
Disclosure of Invention
The invention aims to provide a wavelength conversion mechanism, a projection device and a fluorescence excitation method, which can increase the illumination time interval of a single-point position so as to avoid the reduction of conversion efficiency caused by overhigh temperature of a wavelength conversion material on the wavelength conversion mechanism.
In a first aspect, the present invention provides a wavelength conversion mechanism comprising a wavelength conversion body coated with a wavelength conversion material; the wavelength conversion body is provided with a first rotational degree of freedom and a second rotational degree of freedom, and an included angle is formed between the axis of the first rotational degree of freedom and the axis of the second rotational degree of freedom;
the wavelength converting body is configured to rotate along the first rotational degree of freedom and the second rotational degree of freedom to change a position at which incident light illuminates the wavelength converting body.
With reference to the first aspect, the present disclosure provides a first possible implementation manner of the first aspect, wherein the wavelength conversion body includes a spherical member, an outer surface of which is coated with the wavelength conversion material; the spherical member is configured to rotate about any axis passing through the center of the sphere to change the excitation position of the laser light impinging on the wavelength conversion body.
With reference to the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the wavelength conversion mechanism further comprises a cavity-shaped member, and the spherical member is arranged in a floating manner in an inner cavity of the cavity-shaped member.
In combination with the second possible embodiment of the first aspect, the present invention provides a third possible embodiment of the first aspect, wherein the cavity-shaped member is provided with a side opening communicating with the inner cavity, the side opening is covered with a lens, and the lens seals the side opening.
With reference to the first aspect, the present disclosure provides a fourth possible embodiment of the first aspect, wherein a magnet is connected to the spherical member; the cavity-shaped member is provided with an electromagnetic device to drive the spherical member to rotate around the center of sphere.
In combination with the fourth possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein a magnetic field detection device is arranged inside the cavity-shaped member, and the magnetic field detection device is used for detecting the magnetic field strength and the magnetic field direction of the magnet.
In combination with the second possible implementation manner of the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the cavity-shaped member is provided with an air inlet pipeline and an air outlet which are communicated with the inner cavity; the air inlet pipeline comprises a lifting force air port communicated with the inner cavity, the lifting force air port is arranged at the bottom of the cavity-shaped piece, and the air outlet of the lifting force air port blows the spherical piece from bottom to top so that the spherical piece is suspended in the inner cavity.
With reference to the second possible implementation manner of the first aspect, the present invention provides a seventh possible implementation manner of the first aspect, wherein the intake line includes: first side gas port and second side gas port, the direction of giving vent to anger of first side gas port with the direction of giving vent to anger of second side gas port all follows the sphere setting of spherical piece, just the direction of giving vent to anger of first side gas port with the direction of giving vent to anger of second side gas port has the contained angle.
With reference to the first aspect, the present invention provides an eighth possible implementation manner of the first aspect, wherein the outer surface of the spherical member is provided with a plurality of protrusions arranged at intervals.
With reference to the eighth possible implementation manner of the first aspect, the present disclosure provides a ninth possible implementation manner of the first aspect, wherein the protrusion has a flow-guiding end surface;
the resistance of the airflow flowing through the flow guide end surface along one direction of the first rotational degree of freedom is smaller than the resistance of the airflow flowing through the flow guide end surface along the other direction of the first rotational degree of freedom;
the resistance of the airflow flowing through the flow guide end surface along one direction of the second rotational degree of freedom is smaller than the resistance of the airflow flowing through the flow guide end surface along the other direction of the second rotational degree of freedom.
With reference to the first aspect, the present disclosure provides a tenth possible implementation manner of the first aspect, wherein the wavelength converting body has a hemispherical surface;
one of the axis of the first rotational degree of freedom and the axis of the second rotational degree of freedom is coaxial with the axis of the hemispherical surface.
With reference to the tenth possible implementation manner of the first aspect, the present invention provides an eleventh possible implementation manner of the first aspect, wherein the wavelength conversion mechanism further includes: a first driving device and a second driving device;
the first driving device is connected with the wavelength conversion body to drive the wavelength conversion body to rotate around the axis of the first rotational degree of freedom;
the second driving device is connected with the first driving device to drive the first driving device and the wavelength conversion body to rotate around the axis of the second rotational degree of freedom.
In a second aspect, the invention provides a projection apparatus provided with the wavelength conversion mechanism provided in the first aspect.
In a third aspect, the present invention provides a fluorescence excitation method, comprising: sequentially driving the wavelength conversion body to rotate along the first rotational degree of freedom and the second rotational degree of freedom; alternatively, the wavelength conversion body is driven to rotate along the first rotational degree of freedom and the second rotational degree of freedom simultaneously, and the position where the incident light irradiates the wavelength conversion body is changed.
The embodiment of the invention has the following beneficial effects: the wavelength conversion body coated with the wavelength conversion material is adopted, the wavelength conversion body is provided with a first rotational degree of freedom and a second rotational degree of freedom, an included angle is formed between the axis of the first rotational degree of freedom and the axis of the second rotational degree of freedom, the wavelength conversion body rotates along the first rotational degree of freedom and the second rotational degree of freedom respectively, the effective acting area of the wavelength conversion body irradiated by light can be increased, the illumination time interval of a single-point position is increased, the duration of the single-point position irradiated by incident light is reduced, the over-high temperature of the wavelength conversion mechanism is avoided, and the problem that the conversion efficiency of the wavelength conversion body is reduced due to high temperature is avoided.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a first wavelength conversion mechanism provided in an embodiment of the invention;
FIG. 2 is a cross-sectional view of a first wavelength conversion mechanism provided in accordance with an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a second wavelength conversion mechanism provided by an embodiment of the present invention;
fig. 4 is a schematic view of an air inlet pipe of a second wavelength conversion mechanism according to an embodiment of the present invention;
FIG. 5 is a schematic view of a third wavelength conversion mechanism provided in an embodiment of the present invention;
FIG. 6 is a partial cross-sectional view of a wavelength converting body and cavity provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of a fourth wavelength conversion mechanism according to an embodiment of the present invention.
Icon: 100-wavelength converting body; 101-a boss; 200-a cavity-shaped piece; 210-an air intake line; 211-a first side gas port; 212-a second side gas port; 213-lift gas port; 220-air outlet; 300-a lens; 400-a magnetic field detection device; 500-a magnet; 510-a first permanent magnet member; 520-a second permanent magnet member; 600-an electromagnetic device; 001-first rotational degree of freedom; 002-second rotational degree of freedom; 700-a first drive device; 800-second drive means.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
As shown in fig. 1, 2, 3 and 5, the wavelength conversion mechanism provided by the embodiment of the invention includes a wavelength conversion body 100 coated with a wavelength conversion material; the wavelength conversion body 100 has a first rotational degree of freedom 001 and a second rotational degree of freedom 002, and an axis of the first rotational degree of freedom 001 and an axis of the second rotational degree of freedom 002 have an included angle; the wavelength converting body 100 is configured to rotate in the first rotational degree of freedom 001 and the second rotational degree of freedom 002 to change the position at which the incident light illuminates the wavelength converting body 100.
Specifically, the wavelength conversion body 100 has the first rotational degree of freedom 001 and the second rotational degree of freedom 002 with respect to the light source, and the wavelength conversion body 100 is rotatable with respect to the light source along the first rotational degree of freedom 001 and the second rotational degree of freedom 002, so that the effective acting area of the wavelength conversion material can be increased, and the respective positions of the effective acting surface can be moved into the optical path, respectively, the illumination time interval of the single-point positions is increased, and the duration of the single-point positions being illuminated by the incident light is reduced. Under the condition that the rotation speed of the wavelength conversion body 100 is constant, the temperature rise of the wavelength conversion body 100 caused by illumination is reduced by reducing the time length of the single-point position irradiated by incident light, and the problem that the conversion efficiency of the wavelength conversion body 100 is reduced due to overhigh temperature can be solved.
In one embodiment, the wavelength converting body 100 is rotated along the first rotational degree of freedom 001 to change the position of the wavelength converting body 100 exposed to light, and subsequently, the wavelength converting body 100 is rotated along the second rotational degree of freedom 002 to change the position of the wavelength converting body 100 exposed to light. In the process, the temperature rise area of the wavelength conversion body 100 under illumination is converted from the axial distribution around the first rotational degree of freedom 001 to the axial distribution around the second rotational degree of freedom 002, so that the illuminated area of the wavelength conversion body 100 is relatively dispersed, the surface area of the illuminated area is increased, and heat can be dispersed to relieve the temperature rise.
In another embodiment, the wavelength conversion body 100 may rotate along one of the first rotational degree of freedom 001 and the second rotational degree of freedom 002, or simultaneously rotate along the first rotational degree of freedom 001 and the second rotational degree of freedom 002, so as to further increase the effective acting area of the wavelength conversion body 100, and further increase the surface area of the wavelength conversion material having the same wavelength conversion function, and by driving the wavelength conversion body 100 to rotate at a certain speed relative to the light source, the time length of the single-point position being illuminated can be reduced, thereby avoiding the reduction of the conversion efficiency caused by the over-high temperature of the wavelength conversion body 100.
It should be noted that the wavelength conversion body 100 is rotatable with respect to the light source along one of the first rotational degree of freedom 001 and the second rotational degree of freedom 002, and when the temperature of the region extending around the rotational axis is high or after a certain time of rotation around either rotational axis, the wavelength conversion body 100 is rotated along the other of the first rotational degree of freedom 001 and the second rotational degree of freedom 002 by a certain angle, so as to adjust the region of the wavelength conversion body 100 exposed to light and to make the wavelength conversion body 100 continue to rotate along one of the first rotational degree of freedom 001 and the second rotational degree of freedom 002. Therefore, the action area of the wavelength conversion body 100 irradiated by light is changed, and the influence of high temperature on the conversion efficiency caused by local generation of the wavelength conversion body 100 can be avoided.
As shown in fig. 1, 2 and 3, in the embodiment of the present invention, the wavelength conversion body 100 includes a spherical member, an outer surface of which is coated with a wavelength conversion material; the spherical member is configured to rotate about any axis passing through the center of the sphere to change the excitation position at which the laser light impinges on the wavelength conversion body 100.
Specifically, the wavelength conversion body 100 has a spherical surface, and the wavelength conversion body 100 is rotated about any axis passing through the center of the spherical surface with respect to the light source, so that the position of the incident light on the surface of the wavelength conversion body 100 can be changed. The incident angle of the incident light irradiated on the wavelength conversion body 100 is constant, and the included angle between the light processed by the wavelength conversion material and the emitted light and the incident light is constant, so that the difficulty of arranging the light processing device for the emergent light of the wavelength conversion mechanism is reduced.
Further, the wavelength conversion mechanism further includes a cavity-shaped member 200, and the spherical member is disposed in a floating manner in an inner cavity of the cavity-shaped member 200.
Specifically, the wavelength conversion body 100 can counteract gravity through the action of air flow or magnetic force to be suspended in the inner cavity of the cavity member 200, so that not only can the resistance of the wavelength conversion body 100 to rotation relative to the cavity member 200 be reduced, but also the wavelength conversion body 100 can be protected by the cavity member 200, and the surface of the wavelength conversion body 100 is prevented from being scratched or contaminated by dust.
It should be noted that the cavity-shaped member 200 can prevent dust from adhering to the surface of the wavelength conversion body 100, so as to avoid the problem that the wavelength conversion material is damaged by high temperature due to the large heat absorption capacity of the dust.
Further, the cavity-shaped member 200 is provided with a side opening communicating with the inner cavity, the side opening is covered with the lens 300, and the side opening is sealed by the lens 300. Both incident light and emergent light of the wavelength conversion body 100 can be transmitted through the lens 300, and the space between the lens 300 and the side opening can be sealed by adopting a sealant or a sealing washer and the like, so that dust outside the cavity-shaped piece 200 is prevented from entering the inner cavity of the cavity-shaped piece 200, and the dust can be prevented from generating adverse effects on the excitation efficiency.
Further, the wavelength conversion body 100 may rotate about any axis passing through its center of sphere, and incident light may be directed to the wavelength conversion material along any straight line passing through the center of sphere of the wavelength conversion body 100. The optical paths around the wavelength conversion body 100 can be flexibly arranged, a plurality of side openings are provided on the surface of the cavity 200, and a plurality of beams of incident light are emitted to the wavelength conversion body 100 through the plurality of side openings in a one-to-one correspondence manner, so that interference of the optical paths can be avoided.
As shown in fig. 1 and 2, a magnet 500 is attached inside the spherical member; the cavity-forming member 200 is provided with an electromagnetic device 600 to drive the spherical member in rotation about the centre of the sphere.
Specifically, the magnet 500 may be a permanent magnet, and the permanent magnet is embedded inside the spherical member. The electromagnetic device 600 includes a core and a coil surrounding the core, and by controlling the magnitude and direction of the current of the coil, the magnitude and direction of the magnetic field inside the cavity-shaped member 200 can be changed, thereby enabling the wavelength conversion body 100 to be suspended and rotated in the cavity-shaped member 200. The electromagnetic device 600 may employ a plurality of electromagnets, and at least one electromagnet generates an acting force to counteract the gravity of the wavelength conversion body 100, thereby achieving the suspension of the wavelength conversion body 100. By controlling a plurality of electromagnets installed at intervals along the inner sidewall of the cavity member 200 and having different magnetic pole orientations, the wavelength conversion body 100 can be driven to rotate along the first rotational degree of freedom 001 and the second rotational degree of freedom 002.
Further, the magnet 500 includes: the first permanent magnet member 510 and the second permanent magnet member 520, the extension direction of the magnetic induction lines in the first permanent magnet member 510 and the extension direction of the magnetic induction lines in the second permanent magnet member 520 form an included angle. An included angle between the extending direction of the magnetic induction lines inside the first permanent magnet member 510 and the extending direction of the magnetic induction lines inside the second permanent magnet member 520 may be set to 90 degrees, and the electromagnetic device 600 may adjust the magnetic field direction and the magnetic field strength where the wavelength conversion body 100 is located, so that the wavelength conversion body 100 may rotate along the first rotational degree of freedom 001 and the second rotational degree of freedom 002, and adjust the rotational direction and the rotational speed of the wavelength conversion body 100.
Further, a magnetic field detection means 400 is provided inside the cavity-shaped member 200, and the magnetic field detection means 400 is used for detecting the magnetic field strength and the magnetic field direction of the magnet 500. The magnetic field detection device 400 may employ an electromagnetic sensor, and the magnetic field detection device 400 detects the magnetic field direction of the magnet 500 in the wavelength conversion body 100 by electromagnetic induction. The controller acquires the detection information of the magnetic field detection device 400 at a certain frequency, and can acquire the rotation direction and the rotation speed of the wavelength conversion body 100 through filtering and comparison. The controller may also control the magnetic field direction and the magnetic field strength of the electromagnetic device 600, depending on the rotational direction and rotational speed of the wavelength converting body 100, thereby adjusting the rotational course, rotational direction and rotational speed of the wavelength converting body 100.
Further, the heat of the wavelength conversion body 100 can be conducted to the cavity 200 through the medium between the wavelength conversion body 100 and the cavity 200, the medium between the wavelength conversion body 100 and the cavity 200 can be air, the heat can be transferred from the wavelength conversion body 100 to the cavity 200, and the cavity 200 has a larger surface area and higher heat dissipation efficiency. In addition, in order to smoothly transfer the heat of the wavelength conversion body 100 to the cavity 200, the distance between the outer sidewall of the wavelength conversion body 100 and the inner sidewall of the cavity 200 should be relatively close to each other, thereby shortening the distance of heat transfer.
As shown in fig. 1, 3 and 4, the cavity-shaped member 200 is provided with an air inlet pipe 210 and an air outlet 220 which are communicated with the inner cavity; the intake pipe 210 includes: the first side gas port 211 and the second side gas port 212, the direction of giving vent to anger of first side gas port 211 and the direction of giving vent to anger of second side gas port 212 all set up along the sphere of spherical piece, and the direction of giving vent to anger of first side gas port 211 and the direction of giving vent to anger of second side gas port 212 have the contained angle.
Specifically, the air flow enters the inner cavity of the cavity-shaped member 200 through the air inlet pipe 210, and the air flow flowing along the surface of the wavelength conversion body 100 is discharged through the air outlet 220, so that the air flow exerts a force on the surface of the wavelength conversion body 100, thereby driving the wavelength conversion body 100 to rotate along the first rotational degree of freedom 001 and the second rotational degree of freedom 002. The angle between the outlet direction of the first side gas port 211 and the outlet direction of the second side gas port 212 may be set to 90 degrees, and the gas flow rates of the first side gas port 211 and the second side gas port 212 may be controlled separately, so that the wavelength conversion body 100 may be rotated around any axis passing through the center of the sphere. The airflow flowing over the surface of the wavelength conversion body 100 may further enhance the heat dissipation effect of the wavelength conversion body 100, helping to reduce the temperature of the wavelength conversion material.
Furthermore, two first side air ports 211 are arranged, and the air outlet directions of the two first side air ports 211 are opposite; there are two second side air ports 212, and the air outlet directions of the two second side air ports 212 are opposite. When the air flow is discharged through one of the first side air ports 211, the wavelength conversion body 100 can be driven to rotate along the first rotational degree of freedom 001; when the air is discharged through the other first side air port 211, the wavelength conversion body 100 can be driven to rotate in the reverse direction along the first rotational degree of freedom 001. Similarly, the airflow is sequentially discharged through the two second side air ports 212, and the wavelength conversion body 100 can be driven to respectively realize forward rotation and reverse rotation along the second rotational degree of freedom 002.
Further, the air inlet pipeline 210 further comprises a lifting air port 213 communicated with the inner cavity, the lifting air port 213 is arranged at the bottom of the cavity-shaped member 200, and the air outlet of the lifting air port 213 blows the spherical member from bottom to top so that the spherical member is suspended in the inner cavity. When the air flow is discharged through the lift gas port 213 and into the inner cavity of the cavity shaped member 200, the gas discharged from the lift gas port 213 acts on the bottom of the wavelength converting body 100, and the air flow dynamics of the lift gas port 213 counteract the gravity of the wavelength converting body 100, so that the wavelength converting body 100 can be suspended in the inner cavity of the cavity shaped member 200.
During operation, the lift gas port 213, the plurality of first side gas ports 211 and the plurality of second side gas ports 212 can be used for inputting gas into the inner cavity of the cavity-shaped member 200, so that the surface of the wavelength conversion body 100 is ensured to be filled with high-pressure airflow, and the inner side walls of the wavelength conversion body 100 and the cavity-shaped member 200 are prevented from generating frictional resistance. By separately regulating the gas flow rates of the first side gas ports 211 and the second side gas ports 212, the rotation speed and the rotation direction of the wavelength converting body 100 can be adjusted.
As shown in fig. 6, the outer surface of the spherical member is provided with a plurality of protrusions 101 arranged at intervals. The wavelength conversion material can be formed by coating yellow fluorescent powder, irregular protrusions 101 are formed on the surface of the wavelength conversion material, and the acting force of the airflow on the surface of the spherical part can be increased through the protrusions 101, so that the wavelength conversion body 100 is driven to rotate.
As shown in fig. 3, 5 and 6, the cavity-shaped member 200 may be a hemispherical shell, so that a larger air outlet 220 is formed at the top of the cavity-shaped member 200 to facilitate heat dissipation of the wavelength conversion body 100. The air flow enters the cavity of the cavity-shaped piece 200 from the air inlet duct 210 at the bottom and blows the wavelength converting body 100 to keep the wavelength converting body 100 suspended and rotating.
As shown in fig. 1, 5 and 6, the boss 101 has a flow guide end surface; the resistance of the airflow flowing through the flow guide end surface along one direction of the first rotational degree of freedom 001 is smaller than the resistance of the airflow flowing through the flow guide end surface along the other direction of the first rotational degree of freedom 001; the resistance of the air flow flowing through the flow guide end surface in one direction of the second rotational degree of freedom 002 is smaller than the resistance of the air flow flowing through the flow guide end surface in the other direction of the second rotational degree of freedom 002.
Specifically, the projection of the protrusion 101 on the surface of the wavelength conversion body 100 is triangular or trapezoidal, so that the side surface of the protrusion 101 forms a flow guide end surface; alternatively, the distance between the protrusion 101 and the inner side wall of the cavity 200 decreases from one end to the other end, so that the end surface of the protrusion 101 facing the inner side wall of the cavity 200 serves as a flow end surface. The air flow enters the interior cavity of the cavity-shaped piece 200 from the air inlet conduit 210 and blows the bottom of the wavelength converting body 100, thereby levitating the wavelength converting body 100. The air flows upward along the surface of the wavelength conversion body 100, and under the action of the flow guide end face, the air flow drives the wavelength conversion body 100 to rotate along the first rotational degree of freedom 001 and the second rotational degree of freedom 002, so that the resistance of the air flow is reduced.
As shown in fig. 7, the wavelength converting body 100 has a hemispherical surface; one of the axis of the first rotational degree of freedom 001 and the axis of the second rotational degree of freedom 002 is coaxial with the axis of the hemispherical surface. The wavelength conversion body 100 can rotate along the first rotational degree of freedom 001 and the second rotational degree of freedom 002 respectively, the surface area of the wavelength conversion body 100 is increased compared with the disc surface by the hemispherical surface, and the distance of the peripheral light path of the wavelength conversion body 100 cannot be influenced by the rotation of the wavelength conversion body 100 around any axis passing through the center of the sphere. The wavelength conversion body 100 may include two hemispherical structures, and the two hemispherical structures are concentric to constitute an approximately complete sphere.
Further, the wavelength conversion mechanism further includes: a first driving device 700 and a second driving device 800; the first driving device 700 is connected to the wavelength conversion body 100 to drive the wavelength conversion body 100 to rotate around the axis of the first rotational degree of freedom 001; the second driving device 800 is connected to the first driving device 700 to drive the first driving device 700 and the wavelength converting body 100 to rotate around the axis of the second rotational degree of freedom 002. The first driving device 700 and the second driving device 800 may both adopt motors, the wavelength conversion body 100 is driven to rotate along the first rotational degree of freedom 001 by the first driving device 700, and the wavelength conversion body 100 is driven to rotate along the second rotational degree of freedom 002 by the second driving device 800, so that any position on the surface of the wavelength conversion body 100 can be adjusted to be arranged in a light path, the time for irradiating a single-point position by blue laser is reduced, the temperature of a silver light layer is reduced, and the reduction of the conversion efficiency of the wavelength conversion material caused by high temperature is avoided.
Example two
The projection device provided by the embodiment of the invention is provided with the wavelength conversion mechanism provided by the first embodiment. The projection apparatus provided in this embodiment has the same technical effects as the wavelength conversion mechanism, and therefore, the details are not described herein.
EXAMPLE III
The fluorescence excitation method provided by the embodiment of the invention comprises the following steps: sequentially driving the wavelength conversion body 100 to rotate along the first rotational degree of freedom 001 and the second rotational degree of freedom 002; alternatively, the wavelength converting body 100 is driven to rotate simultaneously in the first rotational degree of freedom 001 and the second rotational degree of freedom 002, and the position where the incident light irradiates the wavelength converting body 100 is changed. The wavelength conversion body 100 is driven to rotate relative to the light source along the first rotational degree of freedom 001 and the second rotational degree of freedom 002, so that the effective acting area of the wavelength conversion material can be increased, and the positions of the effective acting surfaces can be moved into the optical path. Under the condition that the rotating speed of the wavelength conversion body 100 is constant, the illumination time of a single point position on the surface of the wavelength conversion body 100 is shortened, so that the problem that the conversion efficiency is reduced due to high temperature caused by long-time illumination on the local part of the wavelength conversion body 100 can be avoided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A wavelength conversion mechanism comprising a wavelength conversion body (100) coated with a wavelength conversion material;
the wavelength converting body (100) has a first rotational degree of freedom (001) and a second rotational degree of freedom (002), and an axis of the first rotational degree of freedom (001) has an angle with an axis of the second rotational degree of freedom (002);
the wavelength converting body (100) is configured to rotate in the first rotational degree of freedom (001) and the second rotational degree of freedom (002) to change a position at which incident light illuminates the wavelength converting body (100);
the wavelength converting body (100) comprises a spherical piece having an outer surface coated with the wavelength converting material;
the spherical piece is arranged in a suspending mode in an inner cavity of the cavity-shaped piece (200) and is configured to rotate around any axis passing through the sphere center so as to change the excitation position of the laser irradiating the wavelength conversion body (100).
2. The wavelength conversion mechanism according to claim 1, wherein the cavity-shaped member (200) is provided with a side opening communicating with the inner cavity, the side opening is covered with a lens (300), and the lens (300) seals the side opening.
3. The wavelength conversion mechanism according to claim 1 or 2, wherein a magnet (500) is attached inside the spherical member;
the chamber-shaped member (200) is provided with an electromagnetic device (600) for driving the spherical member in rotation about the centre of the sphere.
4. A wavelength conversion mechanism according to claim 3, characterized in that the cavity-shaped member (200) is provided inside with a magnetic field detection means (400), the magnetic field detection means (400) being adapted to detect the magnetic field strength and the magnetic field direction of the magnet (500).
5. The wavelength conversion mechanism according to claim 1, wherein the cavity-shaped member (200) is provided with an air inlet duct (210) and an air outlet (220) communicating with the inner cavity;
the air inlet pipeline (210) comprises a lifting air port (213) communicated with the inner cavity, the lifting air port (213) is arranged at the bottom of the cavity-shaped piece (200), and the air outlet of the lifting air port (213) blows the spherical piece from bottom to top so that the spherical piece is suspended in the inner cavity.
6. The wavelength conversion mechanism according to claim 5, wherein the air inlet conduit (210) comprises: first side gas port (211) and second side gas port (212), the direction of giving vent to anger of first side gas port (211) with the direction of giving vent to anger of second side gas port (212) is all followed the sphere setting of spherical piece, just the direction of giving vent to anger of first side gas port (211) with the direction of giving vent to anger of second side gas port (212) has the contained angle.
7. The wavelength conversion mechanism according to claim 5 or 6, wherein the outer surface of the spherical member is provided with a plurality of protrusions (101) arranged at intervals.
8. The wavelength conversion mechanism according to claim 7, wherein the boss (101) has a flow-guiding end surface;
the resistance of the airflow flowing through the flow guide end surface along one direction of the first rotational degree of freedom (001) is smaller than the resistance of the airflow flowing through the flow guide end surface along the other direction of the first rotational degree of freedom (001);
the resistance of the airflow flowing through the flow guide end surface along one direction of the second rotational degree of freedom (002) is smaller than the resistance of the airflow flowing through the flow guide end surface along the other direction of the second rotational degree of freedom (002).
9. A projection device characterized in that the projection device is provided with a wavelength conversion mechanism as claimed in any one of claims 1 to 8.
10. A fluorescence excitation method using the wavelength conversion mechanism according to any one of claims 1 to 8, the fluorescence excitation method comprising:
sequentially driving the wavelength conversion body (100) to rotate along a first rotational degree of freedom (001) and a second rotational degree of freedom (002);
or driving the wavelength converting body (100) to rotate simultaneously in the first rotational degree of freedom (001) and the second rotational degree of freedom (002) and changing the position at which incident light irradiates the wavelength converting body (100);
the axis of the first rotational degree of freedom (001) has an angle with the axis of the second rotational degree of freedom (002).
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