CN113138523A - Light source device and projection equipment - Google Patents

Light source device and projection equipment Download PDF

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Publication number
CN113138523A
CN113138523A CN202010060192.0A CN202010060192A CN113138523A CN 113138523 A CN113138523 A CN 113138523A CN 202010060192 A CN202010060192 A CN 202010060192A CN 113138523 A CN113138523 A CN 113138523A
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CN
China
Prior art keywords
light
fly
eye lens
lens
wavelength conversion
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Pending
Application number
CN202010060192.0A
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Chinese (zh)
Inventor
陈晨
胡飞
莫美妮
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Publication date
Application filed by Appotronics Corp Ltd filed Critical Appotronics Corp Ltd
Priority to CN202010060192.0A priority Critical patent/CN113138523A/en
Priority to PCT/CN2020/137117 priority patent/WO2021143445A1/en
Publication of CN113138523A publication Critical patent/CN113138523A/en
Pending legal-status Critical Current

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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
    • 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
    • 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
    • G03B21/206—Control of light source other than position or intensity
    • 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
    • G03B21/208—Homogenising, shaping of the illumination light

Abstract

The application provides a light source device, includes: a light source for emitting first excitation light; the wavelength conversion device comprises a wavelength conversion section and a non-wavelength conversion section, the wavelength conversion section absorbs the first exciting light and emits excited light, and the non-wavelength conversion section receives the first exciting light and then emits second exciting light; the light combining device is arranged between the light source and the wavelength conversion device, and is used for guiding the first excitation light to the wavelength conversion device and guiding the excited light and the second excitation light emitted by the wavelength conversion device to emit light; an etendue control unit configured to control etendue of the stimulated light and the second excitation light, the etendue control unit including an aspheric lens; and/or a light beam adjusting element which is arranged on an emergent light path of the light source and is used for adjusting the first exciting light. A projection device is also provided.

Description

Light source device and projection equipment
Technical Field
The application relates to the technical field of optics, in particular to a light source device and projection equipment.
Background
Etendue is an important concept in non-imaging optics, describing the geometrical properties of a beam with a certain aperture angle and cross-sectional area, defined as the integral of the area traversed by the beam and the solid angle occupied by the beam, i.e. the integral of the area occupied by the beam
Etendue≡n2∫∫cosθdAdΩ
Where θ is the area infinitesimal, dA is the normal and solid angle infinitesimal, and d Ω is the angle between the central axes. In an ideal optical system without considering energy loss caused by scattering and absorption, the optical expansion of the light beam after passing through the optical system is kept constant. It measures the change between the beam source area and the solid angle spread as the beam passes through the optical system. The larger the beam angle or the larger the beam source area, the greater the resulting etendue. The process in which the beam becomes progressively larger in the optical system is called etendue dilution.
The dilution of etendue means a larger spot area or a larger divergence angle. The spot area of both the laser beam and the fluorescent beam increases with distance during transmission, thereby diluting etendue. Etendue dilution can cause a number of problems, such as: the larger spot area requires the optical element and the optical system to be larger in volume, and the larger divergence angle requires the optical element (especially the lens) and the optical system to be smaller in F # (F number), which increases the processing difficulty and cost of the optical system. It is therefore always desirable in optical design to keep the etendue as conservative as possible.
Disclosure of Invention
In view of the above problems, the present application provides a light source device and a projection apparatus, which can reduce etendue dilution.
The application provides a light source device, includes: a light source for emitting first excitation light; the wavelength conversion device comprises a wavelength conversion section and a non-wavelength conversion section, the wavelength conversion section absorbs the first exciting light and emits excited light, and the non-wavelength conversion section receives the first exciting light and then emits second exciting light; the light combining device is arranged between the light source and the wavelength conversion device, and is used for guiding the first excitation light to the wavelength conversion device and guiding the excited light and the second excitation light emitted by the wavelength conversion device to emit light; an etendue control unit configured to control etendue of the stimulated light and the second excitation light, the etendue control unit including an aspheric lens; and/or a light beam adjusting element which is arranged on an emergent light path of the light source and is used for adjusting the first exciting light.
The application also provides a projection device which comprises the light modulation device and the light source device.
The light source device and the projection equipment of the embodiment of the application carry out angle correction on the excited light and the second exciting light or the first exciting light through the optical expansion amount control component or the light beam modulation element so as to avoid the optical expansion amount of the light beam in the transmission process from becoming large.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a light source device according to a first embodiment of the present application.
Fig. 2 is a schematic structural diagram of a light source device provided in a first embodiment of the present application, wherein the number of lenses of the optical diffusion amount control assembly is three.
Fig. 3 is a schematic structural diagram of a light source device according to a second embodiment of the present application.
Fig. 4 is a schematic diagram illustrating the principle that the positive and negative lenses in the light source device provided by the second embodiment of the present application reduce the beam diameter of the incident excitation light.
Fig. 5 is a schematic structural diagram of a light source device according to a third embodiment of the present application.
Fig. 6 is a schematic structural diagram of a light source device according to a fourth embodiment of the present application.
Fig. 7 is a schematic view of angle correction of a light beam by a fly-eye lens group according to a fourth embodiment of the present application.
Fig. 8 is a schematic structural diagram of a light source device according to a fifth embodiment of the present application.
Fig. 9 is a schematic structural diagram of a light source device according to a sixth embodiment of the present application.
Fig. 10 is a schematic structural diagram of a compound eye lens group of a light source device provided in an embodiment of the present application.
Fig. 11 is a schematic structural diagram of a compound eye lens group of a light source device according to an embodiment of the present application.
Fig. 12 is a schematic diagram of an imaging relationship between two fly-eye lenses and an optical diffusion amount control assembly according to an embodiment of the present application.
Fig. 13 is a functional relationship between the refractive index n and the wavelength λ of the optical diffusion amount control member provided in the embodiment of the present application.
Fig. 14 is a block diagram of a projection apparatus according to a seventh embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present application, and a detailed description of the like parts is omitted in different embodiments for the sake of brevity.
The embodiment of the application provides a light source device, includes: a light source for emitting first excitation light; the wavelength conversion device comprises a wavelength conversion section and a non-wavelength conversion section, the wavelength conversion section absorbs the first exciting light and emits excited light, and the non-wavelength conversion section receives the first exciting light and then emits second exciting light; the light combining device is arranged between the light source and the wavelength conversion device, and is used for guiding the first excitation light to the wavelength conversion device and guiding the excited light and the second excitation light emitted by the wavelength conversion device to emit light; the optical expansion amount control assembly is used for controlling the expansion amounts of the stimulated light and the second exciting light, the optical expansion amount control assembly is provided with a light incidence end and a light emergence end, the optical expansion amount control assembly comprises an aspheric lens close to the light emergence end, the light incidence end of the optical expansion amount control assembly refers to the end face of the stimulated light and the second exciting light entering the optical expansion amount control assembly, and the light emergence end of the optical expansion amount control assembly refers to the end face of the stimulated light and the second exciting light leaving the optical expansion amount control assembly; and/or a light beam adjusting element which is arranged on an emergent light path of the light source and is used for adjusting the first exciting light.
Referring to fig. 1 to 2, in a light source device 100 according to a first embodiment of the present application, the light source device 100 includes a light source 10, a wavelength conversion device 20, a light combining device 40, and an optical diffusion amount control assembly 30.
The light source 10 is used for emitting first excitation light L1; in one embodiment, the first excitation light may be a collimated parallel beam of light.
The light combining device 40 includes a reflective region and a transmissive region surrounding the reflective region.
The first excitation light L1 enters the reflection region of the light combining device 40, is reflected by the reflection region of the light combining device 40, and then enters the optical diffusion amount control element 30, and the optical diffusion amount control element 30 guides the first excitation light L1 to the wavelength conversion device 20.
The wavelength conversion device 20 includes a wavelength conversion section and a non-wavelength conversion section. Wherein the wavelength conversion section comprises a wavelength conversion material or a wavelength conversion structure capable of absorbing the first excitation light L1 and emitting excited light L3 having a wavelength different from that of the first excitation light L1; the non-wavelength conversion section does not change the wavelength of the first excitation light L1, the non-wavelength conversion section diffuses laser light, and the first excitation light L1 emits second excitation light L2 after being acted by the non-wavelength conversion section; the non-wavelength conversion section can be provided with scattering particles, scattering sheets, diffusion sheets and the like for scattering the first exciting light, so that on one hand, the divergence angle of the second exciting light can be consistent with that of the fluorescent light, the display effect is better, and on the other hand, the coherence of the laser light can be eliminated through scattering.
The etendue control module 30 is further configured to collect the stimulated light L3 and the second excitation light L2 emitted from the wavelength conversion device 20, guide the stimulated light L3 and the second excitation light L2 to the light combining device 40, and then transmit the stimulated light L3 and the second excitation light L2 through the transmission region of the light combining device 40.
There may be a very small amount of the second excitation light L2 and the stimulated light L3 entering the reflection region of the light combining device 40 and being lost, but the amount of the partial light beam is very small and can be ignored.
The second excitation light L2 transmitted from the light combining device 40 and the received laser light L3 transmitted from the light combining device 40 exit along the same optical path.
The etendue control unit 30 includes an aspherical lens 301; the aspheric lens 301 can reduce spherical aberration, so that the imaging quality of the laser imaging spot of the second excitation light L2 and the emergent light beam of the stimulated light L3 can be improved.
In one embodiment, the etendue control unit 30 may include a plurality of lenses, the aspheric lens 301 is one of the plurality of lenses, and the diameter of the aspheric lens 301 is the largest of the plurality of lenses.
In some embodiments, the aspheric lens 301 is disposed at the farthest distance from the wavelength conversion device 20, so that the influence of spherical aberration can be reduced well.
In some embodiments, as shown in fig. 1, the etendue control component 30 includes two converging lenses, namely an aspheric lens 301 close to the fly-eye lens group 30 and a collecting lens 302 far from the fly-eye lens group 30, and the diameter of the aspheric lens 301 is larger than that of the collecting lens 302.
In some embodiments, as shown in fig. 2, the etendue control component 30 includes three converging lenses, from a side away from the wavelength conversion device 20 to a side close to the wavelength conversion device 20, an aspheric lens 301, a first collecting lens 302, and a second collecting lens 303, respectively, where a diameter of the aspheric lens 301 is larger than a diameter of the first collecting lens 302 and a diameter of the second collecting lens 303.
In other embodiments, the number of lenses in the etendue control assembly 30 may also be greater than three.
In other embodiments, if cost is not a concern, more lenses in the etendue control component 30 may be aspheric lenses, for example, the collecting lens 302 and/or the collecting lens 303 in the previous embodiments may be aspheric lenses.
Referring to fig. 3 to 4, in a light source device 100a according to a second embodiment of the present application, the light source device 100a includes a light source 10, a wavelength conversion device 20, a light combining device 40, and a light beam adjusting element 60.
The light source 10 is used for emitting first excitation light L1; in one embodiment, the first excitation light may be a collimated parallel beam of light.
The light combining device 40 includes a reflective region and a transmissive region surrounding the reflective region.
The first excitation light L1 is adjusted by the light beam adjusting element 60 and then enters the reflection region of the light combining device 40, and is reflected by the reflection region of the light combining device 40 and then enters the wavelength conversion device 20.
The wavelength conversion device 20 includes a wavelength conversion section and a non-wavelength conversion section. Wherein the wavelength conversion section comprises a wavelength conversion material or a wavelength conversion structure capable of absorbing the first excitation light L1 and emitting excited light L3 having a wavelength different from that of the first excitation light L1; the non-wavelength conversion section does not change the wavelength of the first excitation light L1, the non-wavelength conversion section diffuses laser light, and the first excitation light L1 emits second excitation light L2 after being acted by the non-wavelength conversion section; the non-wavelength conversion section can be provided with scattering particles, scattering sheets, diffusion sheets and the like for scattering the first exciting light, so that on one hand, the divergence angle of the second exciting light can be consistent with that of the fluorescent light, the display effect is better, and on the other hand, the coherence of the laser light can be eliminated through scattering.
The excited light L3 and the second excitation light L2 emitted from the wavelength conversion device 20 are transmitted through the transmission region of the light combining device 40.
There may be a very small amount of the second excitation light L2 and the stimulated light L3 entering the reflection region of the light combining device 40 and being lost, but the amount of the partial light beam is very small and can be ignored.
The second excitation light L2 transmitted from the light combining device 40 and the received laser light L3 transmitted from the light combining device 40 exit along the same optical path.
The beam adjustment element 60 includes positive and negative lens groups for reducing the beam diameter of the first excitation light.
The positive and negative lens groups comprise a positive lens 601 close to the light source 10 and a negative lens 602 close to the fly eye lens group 50; the positive and negative lens groups are arranged on an emergent light path of the light source 10 and are positioned between the fly eye lens group 50 and the light source 10, and the first exciting light L1 is emitted from the light source 10 and then sequentially passes through the positive lens and the negative lens to the light combination device 40; the positive and negative lens groups are used for reducing the beam diameter of the incident first exciting light L1 so as to weaken spherical aberration and improve the imaging quality of the emergent light beam.
The adjustment principle of the positive and negative lens group on the light path is as follows: as shown in FIG. 4, A is the area of the light beam, B is the area of the light beam passing through the positive and negative lens groups, f1Is the focal length of the positive lens 601 in the positive and negative lens groups, f2The focal length of the negative lens 602 in the positive and negative lens groups; because A/B ═ f1/f2Thus, B ═ f2/f1That is, the area of the light beam of the first excitation light L1 emitted from the light source 10 after being compressed by the positive and negative lenses is reduced, so that the imaging quality of the light beam of the first excitation light L1 is better.
In some embodiments, the distance between the positive lens 601 and the negative lens 602 may be set as desired, for example, the distance between the positive lens 601 and the negative lens 602 may be equal to the focal length of the positive lens 601.
Referring to fig. 5, in a light source apparatus 100b according to a third embodiment of the present application, the light source apparatus 100b includes a light source 10, a wavelength conversion device 20, a light combining device 40, an optical diffusion control assembly 30, and a light beam adjusting element 60.
The light source 10 is used for emitting first excitation light L1; in one embodiment, the first excitation light may be a collimated parallel beam of light.
The light combining device 40 includes a reflective region and a transmissive region surrounding the reflective region.
The first excitation light L1 enters the reflection region of the light combining device 40 through the light beam adjusting element 60, is reflected by the reflection region of the light combining device 40, and then enters the optical diffusion amount control element 30, and the optical diffusion amount control element 30 guides the first excitation light L1 to the wavelength conversion device 20.
The wavelength conversion device 20 includes a wavelength conversion section and a non-wavelength conversion section. Wherein the wavelength conversion section comprises a wavelength conversion material or a wavelength conversion structure capable of absorbing the first excitation light L1 and emitting excited light L3 having a wavelength different from that of the first excitation light L1; the non-wavelength conversion section does not change the wavelength of the first excitation light L1, the non-wavelength conversion section diffuses laser light, and the first excitation light L1 emits second excitation light L2 after being acted by the non-wavelength conversion section; the non-wavelength conversion section can be provided with scattering particles, scattering sheets, diffusion sheets and the like for scattering the first exciting light, so that on one hand, the divergence angle of the second exciting light can be consistent with that of the fluorescent light, the display effect is better, and on the other hand, the coherence of the laser light can be eliminated through scattering.
The etendue control module 30 is further configured to collect the stimulated light L3 and the second excitation light L2 emitted from the wavelength conversion device 20, guide the stimulated light L3 and the second excitation light L2 to the light combining device 40, and then transmit the stimulated light L3 and the second excitation light L2 through the transmission region of the light combining device 40.
There may be a very small amount of the second excitation light L2 and the stimulated light L3 entering the reflection region of the light combining device 40 and being lost, but the amount of the partial light beam is very small and can be ignored.
The second excitation light L2 transmitted from the light combining device 40 and the received laser light L3 transmitted from the light combining device 40 exit along the same optical path.
In some embodiments, the etendue control component 30 includes an aspheric lens 301; the aspheric lens 301 can reduce spherical aberration, so that the imaging quality of the laser imaging spot of the second excitation light L2 and the emergent light beam of the stimulated light L3 can be improved.
In one embodiment, the etendue control unit 30 may include a plurality of lenses, the aspheric lens 301 is one of the plurality of lenses, and the diameter of the aspheric lens 301 is the largest of the plurality of lenses.
In some embodiments, the aspheric lens 301 is disposed at the farthest distance from the wavelength conversion device 20, so that the influence of spherical aberration can be reduced well.
In some embodiments, as shown in fig. 5, the etendue control component 30 includes two converging lenses, namely an aspheric lens 301 close to the fly-eye lens group 30 and a collecting lens 302 far from the fly-eye lens group 30, and the diameter of the aspheric lens 301 is larger than that of the collecting lens 302.
In some embodiments, referring to fig. 2, the etendue control component 30 includes three converging lenses, from a side away from the wavelength conversion device 20 to a side close to the wavelength conversion device 20, an aspheric lens 301, a first collecting lens 302, and a second collecting lens 303, respectively, and a diameter of the aspheric lens 301 is larger than a diameter of the first collecting lens 302 and a diameter of the second collecting lens 303.
In other embodiments, the number of lenses in the etendue control assembly 30 may be greater than three.
In other embodiments, if cost is not a concern, more lenses in the etendue control component 30 may be aspheric lenses, for example, the collecting lens 302 and/or the collecting lens 303 in the previous embodiments may be aspheric lenses.
The beam adjustment element 60 includes positive and negative lens groups for reducing the beam diameter of the first excitation light.
The positive and negative lens groups comprise a positive lens 601 close to the light source 10 and a negative lens 602 close to the fly eye lens group 50; the positive and negative lens groups are arranged on an emergent light path of the light source 10 and are positioned between the fly eye lens group 50 and the light source 10, and the first exciting light L1 is emitted from the light source 10 and then sequentially passes through the positive lens and the negative lens to the light combination device 40; the positive and negative lens groups are used for reducing the beam diameter of the incident first exciting light L1 so as to weaken spherical aberration and improve the imaging quality of the emergent light beam.
The principle of adjusting the optical path by the positive and negative lens groups can be referred to the second embodiment of the present application and is shown in fig. 4, which is not described herein again.
In some embodiments, the distance between the positive lens 601 and the negative lens 602 may be set as desired, for example, the distance between the positive lens 601 and the negative lens 602 may be equal to the focal length of the positive lens 601.
Referring to fig. 6 to 7, a light source device 100c according to a fourth embodiment of the present disclosure is similar to the light source device 100 according to the first embodiment, except that the light source device 100c further includes a compound eye lens set 50. The fly eye lens group 50 is disposed between the light source 10 and the etendue control unit 30.
The fly-eye lens group 50 includes a first fly-eye lens 501, a second fly-eye lens 502, and a third fly-eye lens 503. The fly-eye lens group is substantially U-shaped, the first fly-eye lens 501 is parallel to the second fly-eye lens 502, and the first fly-eye lens 501 is perpendicular to the third fly-eye lens 503. The first fly-eye lens 501 and the second fly-eye lens 502 form a double fly-eye structure, and the third fly-eye lens 503 and the first fly-eye lens 501 also form a double fly-eye structure.
The light combining device 40 is located between the first fly-eye lens 501 and the second fly-eye lens 502, and is tilted with respect to both the first fly-eye lens 501 and the third fly-eye lens 503.
The first excitation light L1 is homogenized by the third fly-eye lens 503 and then enters the reflection region of the light combination device 40, and after being reflected by the reflection region of the light combination device 40, the first excitation light L1 is homogenized by the first fly-eye lens 501 and then enters the first fly-eye lens 501 for further homogenization, the first excitation light L3526 is emitted to the optical diffusion amount control module 30, and the optical diffusion amount control module 30 guides the first excitation light L1 to the wavelength conversion device 20; the received laser light L3 and the second excitation light L2 emitted from the wavelength conversion device 20 are guided by the optical diffusion control assembly 30 to the first fly-eye lens 501 for dodging, and then are transmitted to the second fly-eye lens 502 for dodging again through the transmission region of the light combination device 40.
In the present application, the direction of the first excitation light L1 incident on the optical diffusion amount control module 30 is adjusted and corrected by providing the first and third fly- eye lenses 501 and 503 on one side of the optical diffusion amount control module 30 to adjust the first excitation light L1 incident on the fly-eye lens group 50. The directions of the second excitation light L2 and the received laser light L3 entering the optical diffusion amount control unit 30 are adjusted and corrected by providing the first and second fly eye lenses 501 and 502 on the light path on which the light beam returns and adjusting the second excitation light L2 and the received laser light L3 entering the fly eye lens group 50.
As shown in fig. 7, which is a schematic view of the principle of angle correction of the fly-eye lens assembly 50, the fly-eye lens assembly 50 has a good function of correcting the optical path, wherein fig. 7 illustrates the second excitation light L2 incident on the first and second fly-eye lenses 501 and 502 as an example; after the light beam 1 is incident along the optical axis parallel to the first fly-eye lens 501, the direction of the main optical axis of the emergent light is unchanged and still parallel to the optical axis of the first fly-eye lens 501; when the light beam 2 is incident along an angle α with the optical axis of the first fly-eye lens 501, the main optical axis of the emergent light beam 2 forms an angle β with the optical axis of the first fly-eye lens 501, and α > β; that is, the fly-eye lens group 50 has a function of reducing the beam tilt angle, for example, when α is about 1 °, β is about 0.2 °; the size of the emergent light angle beta can be adjusted by adjusting the size of alpha, and the adjustment precision is higher than that of directly adjusting beta, so that the distance between the edge of the light beam of the second exciting light L2 and the central shaft of the optical diffusion quantity control assembly 30 is reduced as much as possible, and basic conditions are provided for the subsequent light with uniformly distributed emergent surfaces of the whole light source device.
When the first excitation light L1 enters the third and first fly-eye lenses 503 and 501, the principle of the angle correction of the fly-eye lens group 50 is similar to that of the angle correction of the second excitation light L2 entering the first and second fly-eye lenses 501 and 502; specifically, after a light beam is incident along an optical axis parallel to the third fly-eye lens 503 and is reflected by the light combining device 40, a main optical axis of the emergent light is parallel to the optical axis of the first fly-eye lens 501; when a light beam enters along an angle α with the optical axis of the third fly-eye lens 503, the main optical axis of the emergent light beam and the optical axis of the first fly-eye lens 501 form an angle β, where α > β; that is, the fly-eye lens group 50 has a function of reducing the beam tilt angle, for example, when α is about 1 °, β is about 0.2 °; by adjusting the magnitude of α, the magnitude of the outgoing light angle β can be adjusted, and the adjustment accuracy is higher than that of directly adjusting β, so that the distance between the edge of the light beam of the first excitation light L1 incident on the optical diffusion amount control member 30 and the central axis of the optical diffusion amount control member 30 is reduced as much as possible. In practical application, the distance between the edge of the light beam, which is incident from the first excitation light L1 to the optical diffusion quantity control assembly 30, and the central axis of the optical diffusion quantity control assembly 30 can be controlled within the range of 0.2-0.5 mm by using the technical scheme, so that the light spot imaging quality on the surface of the wavelength conversion device 20 is greatly improved, and basic conditions are provided for the subsequent light with uniformly distributed light on the emergent surface of the whole light source device.
The fly eye lens group 50 also has a function of correcting the angle of the excited light L3, and the principle is also similar to the principle of correcting the first excitation light L1 and the second excitation light L2; specifically, after the light beam of the received laser light L3 is incident along the optical axis parallel to the first fly-eye lens 501, the direction of the main optical axis of the emergent light is unchanged and still parallel to the optical axis of the first fly-eye lens 501; when the light beam of the received laser light L3 enters along the optical axis of the first fly-eye lens 501 at an angle α, the main optical axis of the emergent light beam and the optical axis of the first fly-eye lens 501 at an angle β, where α > β; that is, the fly-eye lens group 50 has a function of reducing the beam tilt angle, for example, when α is about 1 °, β is about 0.2 °; the size of the emergent light angle beta can be adjusted by adjusting the size of alpha, and the adjustment precision is higher than that of directly adjusting beta, so that the distance between the edge of the light beam of the second exciting light L2 and the central shaft of the optical diffusion quantity control assembly 30 is reduced as much as possible, the problem of the angle of emergent fluorescence can be eliminated, the optical expansion quantity of the fluorescence is prevented from being diluted, and the imaging quality of the fluorescence is improved.
In addition to the effect of angle correction, the fly-eye lens group 50 also has a function of uniformly imaging the light spot.
In this embodiment, the first fly-eye lens 501 includes a first lens array 5012, and the third fly-eye lens 503 includes a third lens array 5032, where the first lens array 5012 and the third lens array 5032 are respectively composed of a plurality of lens units corresponding to one, the optical axes of the two lens arrays are perpendicular, and the focal length of the lens unit of the third lens array 5032 is equal to the optical path distance between the lens unit of the first lens array 5012 and the lens unit corresponding to the third lens array 5032. Each lens unit of the first lens array 5012 superposes and images a lens unit corresponding to the third lens array 5032 at an infinite position, and then the superposed image at the infinite position is superposed and imaged on the surface of the wavelength conversion device 20 by the action of other lenses in the light source device. That is, the first excitation light L1 passes through the third microlens array 5032 of the third fly-eye lens 503 and then is converged into a plurality of converging points on the light combining device 40 to form a plurality of point light sources, and the light beams of the plurality of point light sources are converged by the first microlens array 5012 of the first fly-eye lens 501, so that a uniform light spot is obtained by superimposing the light spots of each of the point light sources; in brief, each lens unit composing the third lens array 5032 forms an image on the surface of the wavelength conversion device in a superposition manner. According to the technical scheme, the imaging light spots of the lens units are superposed, so that the influence of the possibly existing nonuniformity of the individual light spots on the total light spot is eliminated and compensated, and the guarantee is provided for the subsequent light with the uniformly distributed emergent surface of the whole light source device 100 c. Further, since the imaging process is from the fly-eye lens group 50 to the surface of the wavelength conversion device, once the imaging relationship is established, the object, the image and the lens are determined so that the spot position and uniformity of the surface of the wavelength conversion device are not affected even if the light incident to the fly-eye lens group 50 is deflected (only the light distribution of the light beam before or after the imaging position is affected).
In the present embodiment, the fly-eye lens group 50 also has a function of uniformly imaging the spots of the second excitation light L2 and the stimulated light L3, and the principle is similar to the foregoing principle; wherein the second fly-eye lens 502 includes a second lens array 5022, the first lens array 5012 is parallel to the optical axis of the second lens array 5022, and the focal points of the lens units of the first lens array 5012 coincide with the centers of the corresponding lens units in the second lens array 5022. The second excitation light L1 and the excited light L3 are converged by the first microlens array 5012 of the first fly eye lens 501, and then are acted by the second microlens array 5022 of the second fly eye lens 502 to form uniform parallel light for emission.
That is, in the present application, by the cooperation of one fly-eye lens group 50 and one light combining device 40, the first excitation light L1 entering the wavelength adjustment device 20 and the second excitation light L2 and the received laser light emitted from the wavelength adjustment device 20 can be angle-corrected and homogenized, that is, the fly-eye lens 501 is commonly used for the first fly- eye lens pair 503 and 501 and the second fly- eye lens pair 501 and 502, so that the use of optical elements can be reduced, and the volume of the projection apparatus can be reduced while homogenizing the light beam.
Referring to fig. 8, a light source device 100d according to a fifth embodiment of the present disclosure is similar to the light source device 100a according to the second embodiment, except that the light source device 100d further includes a fly-eye lens set 50. The fly-eye lens group 50 is disposed between the light beam adjusting element 60 and the wavelength conversion device 20.
The fly-eye lens group 50 includes a first fly-eye lens 501, a second fly-eye lens 502, and a third fly-eye lens 503. The fly-eye lens group is substantially U-shaped, the first fly-eye lens 501 is parallel to the second fly-eye lens 502, and the first fly-eye lens 501 is perpendicular to the third fly-eye lens 503. The first fly-eye lens 501 and the second fly-eye lens 502 form a double fly-eye structure, and the third fly-eye lens 503 and the first fly-eye lens 501 also form a double fly-eye structure.
The light combining device 40 is located between the first fly-eye lens 501 and the second fly-eye lens 502, and is tilted with respect to both the first fly-eye lens 501 and the third fly-eye lens 503.
The first excitation light L1 is adjusted by the light beam adjusting element 60 and then enters the third fly-eye lens 503, after being homogenized by the third fly-eye lens 503, enters the reflection region of the light combining device 40, after being reflected by the reflection region of the light combining device 40, enters the first fly-eye lens 501 for further homogenization, and the first excitation light L1 homogenized by the first fly-eye lens 501 is emitted to the wavelength conversion device 20; after the stimulated light L3 and the second excitation light L2 emitted from the wavelength conversion device 20 are incident on the first fly-eye lens 501 for dodging, the stimulated light L3 and the second excitation light L2 are transmitted to the second fly-eye lens 502 for dodging through the transmission region of the light combination device 40.
The function and principle of the compound eye lens assembly 50 can be described with reference to the fourth embodiment, and are not described herein again.
Referring to fig. 9, a light source device 100e according to a sixth embodiment of the present application is similar to the light source device 100b according to the third embodiment, except that the light source device 100e further includes a compound eye lens set 50. The fly-eye lens group 50 is disposed between the light beam adjusting element 60 and the wavelength conversion device 20.
The fly-eye lens group 50 includes a first fly-eye lens 501, a second fly-eye lens 502, and a third fly-eye lens 503. The fly-eye lens group is substantially U-shaped, the first fly-eye lens 501 is parallel to the second fly-eye lens 502, and the first fly-eye lens 501 is perpendicular to the third fly-eye lens 503. The first fly-eye lens 501 and the second fly-eye lens 502 form a double fly-eye structure, and the third fly-eye lens 503 and the first fly-eye lens 501 also form a double fly-eye structure.
The light combining device 40 is located between the first fly-eye lens 501 and the second fly-eye lens 502, and is tilted with respect to both the first fly-eye lens 501 and the third fly-eye lens 503.
The first excitation light L1 is adjusted by the light beam adjusting element 60 and then enters the third fly-eye lens 503, is homogenized by the third fly-eye lens 503 and then enters the reflection region of the light combination device 40, and is reflected by the reflection region of the light combination device 40 and then enters the first fly-eye lens 501 for further homogenization, the first excitation light L1 homogenized by the first fly-eye lens 501 is emitted to the optical diffusion amount control assembly 30, and the optical diffusion amount control assembly 30 guides the first excitation light L1 to the wavelength conversion device 20; the received laser light L3 and the second excitation light L2 emitted from the wavelength conversion device 20 are guided by the optical diffusion control assembly 30 to the first fly-eye lens 501 for dodging, and then are transmitted to the second fly-eye lens 502 for dodging again through the transmission region of the light combination device 40.
The function and principle of the compound eye lens assembly 50 can be described with reference to the fourth embodiment, and are not described herein again.
The above is a basic technical solution of the first embodiment of the present invention, on the basis of which, various specific technical solutions can be derived from each component of the light source device of the present invention according to the actual application environment, and the technical solutions can be combined with each other, which is exemplified below.
In one embodiment, the light source 10 may be a blue laser or a blue laser array, and the light source 10 emits a blue laser beam, wherein the laser beam has a small divergence angle and is concentrated and approximately gaussian-distributed, so that the reflected excitation light can be easily distinguished from the excitation light emitted by the light source 10; in another embodiment, the light source 10 may be a blue light emitting LED, and the light source 10 emits blue LED light. The present invention is not limited to this, but the excitation light emitted from the light source 10 is preferably light having a small divergence angle.
In one embodiment, the third fly-eye lens 503 and the first fly-eye lens 501 may be connected, that is, the third fly-eye lens 503 and an end of the first fly-eye lens 501 may be connected; in one embodiment, for example, the third fly-eye lens 503 and the first fly-eye lens 501 may be formed by integral molding.
In one embodiment, the third fly-eye lens 503 and the second fly-eye lens 502 may be connected, that is, the third fly-eye lens 503 and an end of the second fly-eye lens 502 may be connected; in one embodiment, for example, the third fly-eye lens 503 and the second fly-eye lens 502 may be integrally molded.
In one embodiment, the third fly-eye lens 503 may be connected between the first fly-eye lens 501 and the second fly-eye lens 502; in one embodiment, for example, the third fly-eye lens 503 and the first and second fly- eye lenses 501 and 502 may be formed integrally.
In another embodiment, the first, second and third fly- eye lenses 501, 502 and 503 may be disconnected from each other, i.e. disposed separately.
In an embodiment, as shown in fig. 10, the fly-eye lens group 50 may also be a lens group including a combination of two triangular prisms, which are a first triangular prism and a second triangular prism, respectively. The long sides of the first triangular prism 51 and the second triangular prism 52 are spliced, and the spliced gap is provided with the light combining device 40. Both short sides of the first prism 51 are provided with lens arrays 5012 and 5032, respectively, to form the first fly-eye lens 501 and the third fly-eye lens 503, and one short side of the second prism 52 is provided with a lens array 5022 to form the second fly-eye lens 502. The light combining device 40 is configured to guide the excitation light entering the third fly-eye lens 503 to the first fly-eye lens 501 for emission, and is further configured to guide the stimulated light and the excitation light entering the first fly-eye lens 501 to the second fly-eye lens 502 for emission. The light combining device may be a dichroic sheet, a filter, or the like, and may be disposed at the joint of the first triangular prism 51 and the second triangular prism by means of bonding, clamping, or the like. The light combining device can also be a coated surface, and a coating can be formed on the surface of the first triangular prism or the surface of the second triangular prism on the spliced surface of the first triangular prism and the second triangular prism, so that the light incident to the light combining device can be transmitted or reflected on the coated surface. Specifically, the plated surface may be plated on the surface on which the long side of the first triangular prism 51 is located, or the plated surface may be plated on the surface on which the long side of the second triangular prism 52 is located.
Incorporated into a specific light source device, for example, the third fly-eye lens 503 is formed on the side of the right-angle side of the triangular prism of the fly-eye lens group 50 facing the light source 10, the first fly-eye lens 501 is formed on the side of the right-angle side of the triangular prism close to the wavelength conversion device 20, and the second fly-eye lens 502 is formed on the side of the right-angle side of the triangular prism far from the wavelength conversion device 20; the surfaces of the first, second, and third fly- eye lenses 501, 502, and 503 are each formed with a lens array, and specifically, as shown in fig. 10, three right-angled sides of two triangular prisms are respectively formed with first, second, and third microlens arrays 5012, 5022, and 5032.
In one embodiment, the third fly-eye lens 503 is preferably substantially equal to the first fly-eye lens 501 in length, width, and the like; the third fly-eye lens 503, the first fly-eye lens 501 and the light combining device 40 are substantially arranged in an isosceles right triangle.
In one embodiment, the first microlens array 5012 comprises a plurality of first microlenses, the second microlens array 5022 comprises a plurality of second microlenses, and the third microlens array 5032 comprises a plurality of third microlenses; the first, second and third microlenses include convex surfaces, which are spherical or aspherical surfaces, that is, the first, second and third microlenses are spherical or aspherical mirrors.
In an embodiment, an antireflection film may be formed on surfaces of the first, second, and third microlenses to reduce reflection of light beams and increase intensity of transmitted light.
In one embodiment, referring to fig. 11, the first fly-eye lens 501 includes a first outer surface 5011, the second fly-eye lens 502 includes a second outer surface 5021, the first to third outer surfaces 5011, 5021, 5031 are connected to form a U-shape, the third fly-eye lens 503 includes a third outer surface 5031, the first outer surface 5011 is substantially parallel to the third outer surface 5031, and the first outer surface 5011 is substantially perpendicular to the second outer surface 5021; the excitation light emitted from the light source 10 enters the third outer surface 5031, is reflected by the light combining device 40, and then is emitted through the first outer surface 5011.
In one embodiment, the first microlens array 5012 is disposed on the first outer surface 5011, the second microlens array 5022 is disposed on the second outer surface 5021, and the third microlens array 5032 is disposed on the third outer surface 5031; the third microlens array 5032 divides an incident light beam into a plurality of convergent light beams, the convergent light beams are converged into a plurality of point light sources on the first outer surface 5011 after being reflected by the light combining device 40, and the first microlens array 5012 diffuses and emits light of each point light source. The light reflecting structure (light combining device 40) for realizing the light path turning and the compound eye structure are arranged in a triangular mode, so that the space occupied by the light reflecting structure and the compound eye structure in the projection device is reduced, the miniaturization of the projection device is facilitated, the length of the light path can be reduced, and the uniformity and the illumination brightness of the illumination light beam are improved.
In one embodiment, the first fly-eye lens 501, the second fly-eye lens 502, and the third fly-eye lens 503 may have the same specification; the focal length of each fly-eye lens is equal to the optical path of the excitation light beam propagating in the fly-eye lens group 50; the optical axes of the third micro-lenses and the first micro-lenses are respectively in one-to-one correspondence, so that the optical path of the exciting light beam transmitted from the third micro-lenses to the first micro-lenses in the corresponding rows is the focal length of each fly eye lens. The focal lengths of the microlenses on each fly-eye lens are the same, so that the excitation light beams are converged by each third microlens and then correspondingly transmitted to the corresponding first microlens, and the optical paths of the excitation light beams are the same. For example, the third microlenses in the first row of the third microlens array 5032 correspond to the first microlenses in the first row of the first microlens array 5012, and the third microlenses in the nth row of the third microlens array 5032 correspond to the first microlenses in the nth row of the first microlens array 5012, respectively, one to one.
In an embodiment, the first fly-eye lens 501 and the second fly-eye lens 502 are disposed in parallel, the third fly-eye lens 503 and the first fly-eye lens 501 are disposed in a triangle, and an included angle between the reflection surface of the light combining device 40 and the first outer surface of the first fly-eye lens 501 may be, for example, 20 degrees to 70 degrees.
In one embodiment, the first fly-eye lens 501 is disposed parallel to the second fly-eye lens 502, the third fly-eye lens 503 is disposed in an isosceles right triangle with the first fly-eye lens 501, and an optical path of the excitation light beam from the third microlens to the first microlens of the corresponding row is equal to a distance between the first fly-eye lens 501 and the second fly-eye lens 502, so that a focal length of each fly-eye lens is equal to a distance between the first fly-eye lens 501 and the second fly-eye lens 502.
The light problem of the fly-eye lens assembly 50 and the related devices is complicated, and the fly-eye lens assembly 50 and the related devices can be designed with reference to the following discussion.
As shown in fig. 12, the imaging relationship between two fly-eye lenses and the optical diffusion amount control member 30 (converging lens). Fig. 13 is a plot of refractive index n of a converging lens as a function of wavelength λ. Assuming that the size of a single lens cell of a fly-eye lens is a × b, the distance between two fly-eye lenses is L (equal to the focal length f of the lens cell of a fly-eye lens)MLA) The compound eye unit passes through an optical diffusion amount control unit 30 (equivalent focal length f)Lens) After the size of the image is A B, then A f is presentLens/fMLA*a；B＝fLens/fMLAB. For an ideal spherical mirror, there is f (λ) ═ R/(n)(λ)-1); wherein R is the curvature radius of the equivalent spherical mirror unit, n(λ)Is the refractive index of the lens material, n(λ)Typically as a function of wavelength, as shown in fig. 13. Thus, the larger the refractive index, the shorter the lens equivalent focal length. Using lens materials, the focal length of the corresponding blue light is smaller than the focal length corresponding to the wavelength of the fluorescence it excites, i.e. blue light fB<fFluorescence. It is assumed that the optical diffusion amount control assembly 30 is an ideal lens group so that the blue light spot on the fluorescence wheel can be in the image of an ideal compound eye unit. In addition, the excited fluorescent light spot is collected by the optical diffusion amount control assembly 30 and then enters the double compound eyes formed by the first compound eye lens 501 and the second compound eye lens 502 to be emitted. Due to the principle of light reversibility, the fluorescence emitted through second fly-eye lens 502 can be equivalently regarded as the fluorescence incident from the fly-eye of second fly-eye lens 502, and the fly-eye unit is also imaged onto wavelength conversion device 20. In the optical design process, the fluorescence optical diffusion amount control unit 30 and the fly-eye lens corresponding to the designed fluorescence are designed by taking the fluorescence optical path into consideration. The equivalent focal length of the fluorescent optical diffusion volume control assembly 30 is fLens-PhosphorThe equivalent focal length of the fly-eye lens for fluorescence is fMLA-PhosphorThe size of the fluorescent spot can be expressed as
Figure BDA0002374203830000161
Similarly, the equivalent focal length of the laser light for the fluorescent optical diffusion volume control assembly 30 is fLens-LaserThe equivalent focal length of the fly-eye lens to the laser light is fMLA-LaserThe size of the laser spot can be expressed as
Figure BDA0002374203830000162
When designing the laser spot, it is necessary to consider the spot spread on the wavelength conversion device 20 when the laser excites the fluorescence, and therefore the laser spot is required to be smaller than the fluorescence spot. On this premise, it is preferable that the dispersion of the optical diffusion amount control member 30 is smaller than the dispersion of the fly-eye lens so that the magnification of fluorescence corresponding to the combination of the fly-eye lens and the optical diffusion amount control member is larger than that of the laser light, that is, the magnification of the laser light is larger
Figure BDA0002374203830000163
Further still, it is preferred that the collection lens material be less dispersive such that fLens-Phosphor≈fLens-LaserI.e. the laser and the fluorescence have close focal positions. On the other hand, since the angle at which the laser light is incident on the third fly-eye lens 503 is generally small, it is conceivable that the distance between the third fly-eye lens 503 and the first fly-eye lens 501 is larger than fMLA-LaserIt is also an option to reduce the laser spot size on the wavelength conversion device 20. However, this solution also changes the imaging position of the laser light passing through the optical diffusion amount control member to be different from fLens-Laser. Therefore, in actual design, it is necessary to comprehensively consider the dispersion relation of the optical diffusion amount control component and the fly-eye lens material, the distance between the third fly-eye lens 503 and the first fly-eye lens 501, and the size of the lens unit of the fly-eye lens.
In one embodiment, the reflection region of the light combining device 40 is located at a substantially central position of the light combining device 40, and since the light beam of the first excitation light L1 is concentrated, only a small area of the reflection region is required when the first excitation light L1 passes through the reflection region, and thus the area of the transmission region of the light combining device 40 can be set to be much larger than the area of the reflection region; further, the area of the transmission region of the light combining device 40 is much larger than that of the reflection region, so that the second excitation light L2 and the stimulated light L3 entering the reflection region of the light combining device 40 are as small as possible, so as to improve the transmittance of the second excitation light L2 and the stimulated light L3.
In one embodiment, the reflection region of the light combining device 40 may be a filter/film/dichroic plate that reflects the first excitation light L1 and transmits the stimulated light L3, so as to improve the transmittance of the stimulated light L3.
In one embodiment, the light combining device 40, the first fly-eye lens 501 and the third fly-eye lens 503 form an isosceles right triangle structure, the light combining device 40 is a base of the isosceles right triangle, and the first fly-eye lens 501 and the third fly-eye lens 503 are waists of the isosceles right triangle.
In one embodiment, the wavelength conversion device 20 is a wheel structure (fluorescent color wheel), and includes wavelength conversion sections and reflective sections arranged in a sector ring shape on the wheel structure, that is, the non-wavelength conversion sections are reflective sections, and are driven by a driving device (such as a motor) to rotate around the central axis of the wheel; in another embodiment, the wavelength conversion device 20 can also be a fluorescent color barrel/color drum, which includes wavelength conversion sections and reflection sections distributed around the barrel/drum surface, and the color barrel/color drum rotates around its axis direction, so that different sections are periodically exposed to the exciting light according to time sequence; alternatively, the wavelength conversion device 20 may also be a fluorescent color plate, which includes a wavelength conversion section and a reflection section sequentially arranged along a straight line direction, and the color plate linearly vibrates along the straight line direction, so that different sections are periodically exposed to the excitation light according to the time sequence, thereby emitting the time sequence light.
In one embodiment, the wavelength conversion section of the wavelength conversion device 20 includes a phosphor layer, which may be a phosphor-organic adhesive layer (separated phosphors are bonded into layers by organic adhesives such as silica gel and epoxy resin), a phosphor-inorganic adhesive layer (separated phosphors are bonded into layers by inorganic adhesives such as glass), or a phosphor ceramic (including (i) a structure in which continuous ceramics are used as a matrix and phosphor particles are distributed in the ceramics; (ii) a pure-phase ceramic doped with an activator element such as Ce-doped YAG ceramic, and (iii) phosphor particles dispersed in the ceramics based on the pure-phase ceramic doped with the activator element). In another embodiment, the wavelength conversion section comprises a layer of quantum dots, with the photoluminescence function being performed by the quantum dot material. The wavelength conversion device 20 may have only one wavelength conversion section (e.g., a yellow wavelength conversion section), two wavelength conversion sections (e.g., a green wavelength conversion section and a red wavelength conversion section), and two or more wavelength conversion sections.
In one embodiment, the wavelength converting section is provided with at least one color phosphor. Specifically, the illumination beam is a blue laser beam, and the wavelength conversion section is divided into a green wavelength conversion section and a red wavelength conversion section. The red wavelength conversion section is provided with a fluorescent powder layer capable of exciting to generate red light or a fluorescent powder layer capable of exciting to generate a light containing red light wave band. The fluorescent powder layer capable of exciting to generate red light wave bands can be a yellow fluorescent powder layer, fluorescent light containing red light wave bands is generated by exciting the yellow fluorescent powder layer, and then the red fluorescent light is filtered through the red filter membrane. For convenience of description, a phosphor layer capable of exciting to generate red light or a phosphor layer capable of exciting to generate light including a red light band is collectively referred to as a "red phosphor layer". The green wavelength conversion section is provided with a phosphor layer capable of exciting to generate green light or a phosphor layer capable of exciting to generate light containing a green light wave band. The fluorescent powder layer capable of exciting to generate green light wave band can be a yellow fluorescent powder layer, fluorescent light containing green light wave band is generated by exciting the yellow fluorescent powder layer, and then green fluorescent light is filtered out through the green filter membrane. For convenience of description, a phosphor layer capable of exciting to generate green light or a phosphor layer capable of exciting to generate light containing a green wavelength band is collectively referred to as a "green phosphor layer". Therefore, the wavelength conversion section may be provided with a red phosphor layer or a phosphor layer containing red phosphor and a green phosphor layer. The blue laser beam is projected to the red wavelength conversion section to excite and generate a red fluorescent beam, and the blue laser beam is projected to the green wavelength conversion section to excite and generate a green fluorescent beam. The red and green fluorescent beams excited by the blue laser beam are shaped into parallel beams by the fly-eye lens group 50, and three primary colors of light, i.e., the red, green and blue fluorescent beams, are generated.
It should be noted that the above technical solution is also applicable to a bicolor light source. When the lasers generating the two-color light source are a blue laser and a red laser, the reflective wavelength conversion device 20 (the fluorescent wheel) only needs to be provided with a green fluorescent powder layer; meanwhile, the reflecting region of the reflective fluorescent wheel needs to be correspondingly provided with a blue reflecting region and a red reflecting region according to the lighting time sequence of the blue laser and the red laser; the blue laser and the red laser excite the green fluorescent powder, the reflective fluorescent wheel excites the green fluorescent powder, the blue laser and the red laser are reflected, and the tricolor light can be formed. And will not be described in detail herein.
In one embodiment, the reflective section of the wavelength conversion device 20 includes a metal reflective surface that specularly reflects the excitation light. In another embodiment, the reflective section includes a dielectric reflective film (dielectric reflecting film) for specularly reflecting the excitation light. In other embodiments of the present invention, the reflection section may also adopt other reflection structures to reflect the excitation light.
In another embodiment, the non-wavelength conversion section of the wavelength conversion device 20 may also be a transmission section, and in this case, a light path turning element may be cooperatively disposed on the transmission light path of the wavelength conversion device 20 to turn the transmission light to the compound eye lens group 50.
In some embodiments, the light source devices 100a to 100e may further include a relay lens, and the relay lens may be disposed on a side of the fly-eye lens group 50 from which the received laser light exits; the relay lens may be a concave lens, a convex lens, a concave lens group, a convex lens group, a combination thereof, or the like.
Referring to fig. 14, a projection apparatus 200 is further provided in the seventh embodiment of the present application, where the projection apparatus 200 includes one or more of the light source devices 100, 100a to 100 e. As shown in fig. 14, the projection apparatus 200 may further include, for example, a light modulation device 202 and a lens device 203, and the projection display function is realized by projecting the light emitted from the light source device onto the light modulator of the light modulation device 202, modulating the spatial distribution of the light according to an input image signal, and emitting the modulated light through the lens device 203 to form an image.
The projection device 200 may be, for example: education machines, cinema machines, engineering machines, micro-projection machines, laser televisions and the like have laser fluorescent light source products.
The light source devices 100, 100a to 100e of the present invention can also be applied to image lighting such as an image projection lamp, a vehicle (vehicle, ship, airplane) lamp, a searchlight, a stage lamp, and the like.
Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (11)

1. A light source device, comprising:
a light source for emitting first excitation light;
the wavelength conversion device comprises a wavelength conversion section and a non-wavelength conversion section, the wavelength conversion section absorbs the first exciting light and emits excited light, and the non-wavelength conversion section receives the first exciting light and then emits second exciting light;
the light combining device is arranged between the light source and the wavelength conversion device, and is used for guiding the first excitation light to the wavelength conversion device and guiding the excited light and the second excitation light emitted by the wavelength conversion device to emit light;
the optical expansion control component is used for controlling the expansion of the stimulated light and the second exciting light and comprises an aspheric lens; and/or
And the light beam adjusting element is arranged on an emergent light path of the light source and is used for adjusting the first exciting light.
2. The light source device according to claim 1, wherein the light source device includes the etendue control component, the etendue control component includes a plurality of lenses, the aspherical lens is one of the plurality of lenses, and a diameter of the aspherical lens is the largest of the plurality of lenses.
3. The light source device according to claim 2, wherein the aspherical lens of the etendue control member is a lens farthest from the wavelength conversion device among the plurality of lenses.
4. The light source device according to claim 1, wherein the light source device includes a beam adjusting element; the beam adjustment element includes positive and negative lens groups for reducing a beam diameter of the first excitation light.
5. The light source device according to claim 2, wherein the positive and negative lens groups include a positive lens and a negative lens, the first excitation light passes through the positive lens and the negative lens in this order, and a distance between the positive lens and the negative lens is equal to a focal length of the positive lens.
6. The light source device according to any one of claims 1 to 5, further comprising a fly-eye lens group disposed on an exit optical path of the wavelength conversion device, the fly-eye lens group including a first fly-eye lens, a second fly-eye lens, and a third fly-eye lens;
the first fly-eye lens and the second fly-eye lens are arranged in parallel, and the third fly-eye lens is perpendicular to the first fly-eye lens; the first fly-eye lens and the third fly-eye lens form a double fly-eye structure, and the first fly-eye lens and the third fly-eye lens are used for homogenizing the first exciting light emitted by the light source and then emitting the first exciting light to the wavelength conversion device; the first fly-eye lens and the second fly-eye lens form a double fly-eye structure, and are used for homogenizing and emitting the stimulated light and the second excitation light.
7. The light source device according to claim 6, wherein the fly-eye lens group is disposed in a U-shape as a whole, and the light combining device is disposed between the first fly-eye lens and the second fly-eye lens; the fly-eye lens group comprises a first outer surface positioned on the first fly-eye lens, a second outer surface positioned on the second fly-eye lens and a third outer surface positioned on the third fly-eye lens; the first outer surface is formed with a first lens array, the second outer surface is formed with a second lens array, and the third outer surface is formed with a third lens array.
8. The light source device according to claim 1, wherein the fly-eye lens group includes a first triangular prism and a second triangular prism; the long limit of first prism with the long limit concatenation setting of second prism, the gap of concatenation is provided with close light device, two minor faces of first prism all are provided with lens array in order to form first fly-eye lens and third fly-eye lens, a minor face of second prism is provided with lens array in order to form second fly-eye lens.
9. The light source device according to claim 6, wherein the light combining device is provided with a reflection region for reflecting the first excitation light incident from the third fly-eye lens to the first fly-eye lens; the light combining device is also provided with a transmission area, and the transmission area surrounds the reflection area; the transmission region is used for transmitting the stimulated light and the second excitation light which are emitted from the first fly-eye lens to the second fly-eye lens.
10. The light source device according to claim 9, wherein the reflection region is a filter, a filter film, or a dichroic plate that reflects the first excitation light and transmits the stimulated light.
11. A projection apparatus comprising light modulation means and a light source device as claimed in any one of claims 1 to 10.
CN202010060192.0A 2020-01-19 2020-01-19 Light source device and projection equipment Pending CN113138523A (en)

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TW200743223A (en) * 2006-05-01 2007-11-16 Coretronic Corp Light-emitting diode light source system
CN108008593B (en) * 2016-10-28 2020-02-28 深圳光峰科技股份有限公司 Light source system and display device
CN108572497B (en) * 2017-03-14 2019-12-17 深圳光峰科技股份有限公司 Light source device and projection system
CN207457687U (en) * 2017-09-26 2018-06-05 深圳市光峰光电技术有限公司 Light-source system and projector equipment
CN107861178A (en) * 2017-10-10 2018-03-30 青岛海信电器股份有限公司 Compound eye lens group and apply its projection arrangement
CN109164589A (en) * 2018-09-18 2019-01-08 无锡视美乐激光显示科技有限公司 A kind of light splitting Multiplexing apparatus and light-source system

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