CN210720999U

CN210720999U - Light emitting device and projection system

Info

Publication number: CN210720999U
Application number: CN201922139607.9U
Authority: CN
Inventors: 陈龙; 葛明星
Original assignee: Wuxi Seemile Laser Display Technology Co Ltd
Current assignee: Wuxi Seemile Laser Display Technology Co Ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-06-09
Anticipated expiration: 2029-12-03

Abstract

The utility model provides a light emitting device and projection system relates to optics technical field, and this light emitting device separates through the light splitting wheel and is used for the partial excitation light of output and the partial excitation light that is used for carrying out wavelength conversion and produces the excited light, and wherein the partial excitation light that is used for the output is exported through light guide assembly and dichroic mirror, can not produce the influence in the aspect of the heat dissipation to wavelength conversion equipment, has improved wavelength conversion equipment's heat dispersion to wavelength conversion equipment's excitation efficiency has been improved; the light homogenizing effect of the light homogenizing rod on the exciting light makes the light spot energy of the exciting light entering the wavelength conversion device more uniform, and further improves the exciting efficiency of the wavelength conversion device.

Description

Light emitting device and projection system

Technical Field

The utility model belongs to the technical field of the optical technology and specifically relates to a light emitting device and projection system are related to.

Background

The structure of a laser fluorescent light source commonly used in a laser projector at present is shown in fig. 1, wherein excitation light emitted by a laser 10 is incident to a wavelength conversion element 60 after passing through a collimating system 20, a diffusion sheet 30, a dichroic element 40 and a first light collecting element 50, the wavelength conversion material on the excitation wavelength conversion element 60 generates stimulated light, and the stimulated light is reflected and output by the dichroic element 40 after being collected by the first light collecting element 50; the wavelength conversion element 60 has a transmission portion or a notch, and is capable of transmitting a part of the excitation light, the transmitted excitation light is collected by the second light collecting element 70 and then recovered by the light recovery system 80, the light recovery system 80 includes three mirrors and a diffusion sheet, after the excitation light emitted from the second light collecting element 70 is reflected and homogenized for many times by the light recovery system 80, the incident direction changes by 270 °, the excitation light is transmitted out of the dichroic element 40 from the direction perpendicular to the optical axis of the collimating system 20, and then is combined with the excited light reflected by the dichroic element 40.

However, the wavelength conversion device in the laser fluorescent light source has poor heat dissipation effect and low excitation efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a light emitting device and projection system to improve wavelength conversion equipment's heat dispersion and arouse efficiency.

The embodiment of the utility model provides a light-emitting device, including laser source, beam split wheel, light guide assembly, dodging stick, dichroic mirror and wavelength conversion equipment; the laser light source and the wavelength conversion device are respectively arranged at two sides of the dichroic mirror, the light splitting wheel is arranged between the laser light source and the dichroic mirror, the light homogenizing rod is arranged between the light splitting wheel and the dichroic mirror, and the light splitting wheel and the dichroic mirror are positioned at the same side of the light guide component;

the laser light source is used for emitting exciting light; the light splitting wheel is used for splitting the exciting light, so that part of the exciting light is incident to the light guide component, and the other part of the exciting light is incident to the dodging rod; the light guide component is used for guiding exciting light to the dichroic mirror; the light homogenizing rod is used for homogenizing the light spot energy of the exciting light; the dichroic mirror is used for transmitting the excitation light from the dodging rod to the wavelength conversion device, transmitting the excitation light from the light guide assembly, and reflecting the stimulated excitation light generated by wavelength conversion of the excitation light by the wavelength conversion device.

Further, the even light bar comprises a rectangular even light bar or a conical even light bar, the light incident surface of the rectangular even light bar and the light emergent surface of the rectangular even light bar are both rectangular, and the size of the light incident surface of the conical even light bar is larger than that of the light emergent surface of the conical even light bar.

Further, the beam splitting wheel comprises a transmission area and a reflection area, the transmission area and the reflection area are arranged along the circumferential direction of the beam splitting wheel, the transmission area is used for transmitting the excitation light to the light homogenizing rod, and the reflection area is used for reflecting the excitation light to the light guide assembly.

Further, the reflection region is provided with a selective transmission film which reflects light having a wavelength of 465nm or less and transmits light having a wavelength of 465nm or more.

Further, the transmission region comprises a transmission region or a scattering region, the transmission region is used for transmitting the excitation light to the light homogenizing rod, and the scattering region is used for scattering the excitation light to the light homogenizing rod.

Further, the wavelength conversion device includes a wavelength conversion partition having a wavelength conversion material disposed thereon.

Further, the wavelength conversion device comprises at least one wavelength conversion subarea and a blank subarea, wherein wavelength conversion materials are arranged on the wavelength conversion subarea;

the wavelength conversion device and the light splitting wheel rotate synchronously, so that when the light splitting wheel rotates to the reflecting area, the wavelength conversion device rotates to the blank subarea.

Further, the light splitting wheel comprises a transmission area arranged along the circumferential direction of the light splitting wheel and a partial transmission area plated with a semi-permeable membrane; the wavelength conversion device also comprises a first wavelength conversion subarea and a second wavelength conversion subarea, wherein a first wavelength conversion material is arranged on the first wavelength conversion subarea, and a second wavelength conversion material is arranged on the second wavelength conversion subarea;

the wavelength conversion device and the light splitting wheel rotate synchronously, so that when the light splitting wheel rotates to the partial transmission area, the wavelength conversion device rotates to the second wavelength conversion subarea.

Further, the first wavelength converting material comprises a yellow wavelength converting material and the second wavelength converting material comprises a blue wavelength converting material.

Further, the beam splitting wheel comprises a semi-permeable membrane coated partially transmissive region disposed along a circumferential direction thereof, and the wavelength conversion device comprises a wavelength conversion sub-region on which a wavelength conversion material is disposed.

Further, the semi-permeable membrane of the partially transmissive region has a transmittance of 70% for light having a wavelength between 440nm and 470 nm.

Further, the laser light source comprises an excitation light source, or the laser light source comprises an excitation light source and a compensation light source; the excitation light source is used for emitting excitation light, the compensation light source is used for emitting compensation light, and the light splitting wheel is also used for enabling the compensation light to be incident to the light guide component; the wavelength conversion device is cylindrical or disc-shaped.

Further, the excitation light source emits 455nm blue excitation light, and the compensation light source emits 638nm red compensation light; the dichroic mirror transmits light having wavelengths below 465nm and above 630nm and reflects light having wavelengths between 465nm and 630 nm.

The embodiment of the utility model provides a projection system is still provided, including foretell illuminator.

In the light emitting device and the projection system provided by the utility model, the light emitting device comprises a laser light source, a beam splitter wheel, a light guide component, a light homogenizing rod, a dichroic mirror and a wavelength conversion device; the laser light source and the wavelength conversion device are respectively arranged at two sides of the dichroic mirror, the light splitting wheel is arranged between the laser light source and the dichroic mirror, the light homogenizing rod is arranged between the light splitting wheel and the dichroic mirror, and the light splitting wheel and the dichroic mirror are positioned at the same side of the light guide component; the laser light source is used for emitting exciting light; the light splitting wheel is used for splitting the exciting light, so that part of the exciting light is incident to the light guide component, and the other part of the exciting light is incident to the light homogenizing rod; the light guide component is used for guiding the exciting light to the dichroic mirror; the light homogenizing rod is used for homogenizing the light spot energy of the exciting light; the dichroic mirror is used for transmitting the exciting light from the light homogenizing rod to the wavelength conversion device, transmitting the exciting light from the light guide assembly, and reflecting the stimulated light generated by wavelength conversion of the exciting light by the wavelength conversion device. The light-emitting device separates part of excitation light for output and part of excitation light for wavelength conversion to generate excited light through the light splitting wheel, wherein the part of excitation light for output is output through the light guide assembly and the dichroic mirror, so that the influence on the heat dissipation of the wavelength conversion device is avoided, the heat dissipation performance of the wavelength conversion device is improved, and the excitation efficiency of the wavelength conversion device is improved; in addition, the dodging action of the dodging rod on the exciting light makes the energy of light spots of the exciting light entering the wavelength conversion device more uniform, and the exciting efficiency of the wavelength conversion device is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a laser fluorescence light source in the prior art;

fig. 2 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention;

fig. 3 is a transmission spectrum of a dichroic mirror according to an embodiment of the present invention;

fig. 4 is a transmission spectrum of a permselective membrane according to an embodiment of the present invention;

fig. 5a is a schematic structural diagram of another light splitting wheel according to an embodiment of the present invention;

fig. 5b is a schematic structural diagram of another wavelength conversion device according to an embodiment of the present invention;

fig. 6a is a schematic structural diagram of another light splitting wheel according to an embodiment of the present invention;

fig. 6b is a schematic structural diagram of another wavelength conversion device according to an embodiment of the present invention;

fig. 7a is a schematic structural diagram of another light splitting wheel according to an embodiment of the present invention;

fig. 7b is a schematic structural diagram of another wavelength conversion device according to an embodiment of the present invention;

fig. 8a is a schematic structural diagram of another light splitting wheel according to an embodiment of the present invention;

fig. 8b is a schematic structural diagram of another wavelength conversion device according to an embodiment of the present invention;

fig. 9a is a schematic structural diagram of another light splitting wheel according to an embodiment of the present invention;

fig. 9b is a schematic structural diagram of another wavelength conversion device according to an embodiment of the present invention;

fig. 10 is a transmission spectrum of a partially transmissive semi-permeable membrane according to an embodiment of the present invention;

fig. 11a is a schematic structural diagram of another light splitting wheel according to an embodiment of the present invention;

fig. 11b is a schematic structural diagram of another wavelength conversion device according to an embodiment of the present invention.

Icon: 10-a laser; 20-a collimation system; 30-a diffusion sheet; a 40-dichroic element; 50-a first light collecting element; 60-wavelength converting elements; 70-a second light collecting element; 80-light recovery system; 101-a laser light source; 102-a beam splitting wheel; 103-a light directing assembly; 104-a light homogenizing rod; 105-a dichroic mirror; 106-a wavelength conversion device; 201-a first lens; 202-a second lens; 203-a third lens; 204-a fourth lens; 205-a first mirror; 206-second mirror.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, in the laser fluorescence light source in the prior art, since the front and back surfaces of the wavelength conversion element 60 are both located in the light path, and the second light collecting element 70 disposed close to the wavelength conversion element 60 collects the excitation light, the heat dissipation structure of the wavelength conversion element 60 is not well disposed, so that the heat dissipation effect of the wavelength conversion element 60 is poor, and the excitation efficiency is low, and meanwhile, the diffusion sheet 30 is adopted to homogenize the excitation light, so that the homogenization effect is poor, and the excitation efficiency of the wavelength conversion element 60 is also low. Based on this, the embodiment of the utility model provides a pair of light emitting device and projection system can improve wavelength conversion device's heat dispersion and excitation efficiency.

To facilitate understanding of the present embodiment, a light emitting device disclosed in the embodiments of the present invention will be described in detail first.

Referring to a schematic structural diagram of a light-emitting device shown in fig. 2, the light-emitting device includes a laser light source 101, a beam splitter wheel 102, a light guide assembly 103, a light homogenizing rod 104, a dichroic mirror 105, and a wavelength conversion device 106; the laser light source 101 and the wavelength conversion device 106 are respectively arranged on two sides of the dichroic mirror 105, the beam splitter wheel 102 is arranged between the laser light source 101 and the dichroic mirror 105, the light homogenizing rod 104 is arranged between the beam splitter wheel 102 and the dichroic mirror 105, and the beam splitter wheel 102 and the dichroic mirror 105 are positioned on the same side of the light guide assembly 103.

The laser light source 101 is configured to emit excitation light; the light splitting wheel 102 is used for splitting the excitation light, so that part of the excitation light is incident to the light guide component 103, and the other part of the excitation light is incident to the light homogenizing rod 104; light guiding component 103 is used to guide the excitation light to dichroic mirror 105; the dodging stick 104 is used for homogenizing the light spot energy of the excitation light; the dichroic mirror 105 is used to transmit the excitation light from the integrator rod 104 to the wavelength conversion device 106, transmit the excitation light from the light guide assembly 103, and reflect the excited light generated by wavelength conversion of the excitation light by the wavelength conversion device 106.

As shown in fig. 2, the light path of the light emitting device is as follows: excitation light emitted by the laser light source 101 is incident on the beam splitting wheel 102; part of the excitation light enters the light guide assembly 103 through the beam splitting wheel 102, is guided to the dichroic mirror 105 by the light guide assembly 103, and is finally output by penetrating through the dichroic mirror 105; the other part of the excitation light enters the light homogenizing rod 104 through the light splitting wheel 102, then enters the wavelength conversion device 106 after passing through the light homogenizing rod 104 and the dichroic mirror 105, is converted into stimulated light after the wavelength conversion action of the wavelength conversion device 106, is reflected back to the dichroic mirror 105 by the wavelength conversion device 106, and is then reflected and output by the dichroic mirror 105. Thus, the same optical path output of the exciting light and the stimulated light is realized.

In this embodiment, the light emitting device separates, by the light splitting wheel, a part of excitation light for output and a part of excitation light for wavelength conversion to generate excited light, where the part of excitation light for output is output through the light guide assembly and the dichroic mirror, and does not affect the wavelength conversion device in terms of heat dissipation; in addition, the dodging action of the dodging rod on the exciting light makes the energy of light spots of the exciting light entering the wavelength conversion device more uniform, and the exciting efficiency of the wavelength conversion device is further improved.

In some possible embodiments, the laser light source 101 includes an excitation light source for emitting excitation light. The laser light source 101 can thus emit a single excitation light, such as blue, violet, or ultraviolet light.

In other possible embodiments, the laser source 101 includes an excitation light source and a compensation light source; the excitation light source is used for emitting excitation light, and the compensation light source is used for emitting compensation light; the dichroic wheel 102 is also used to make the compensation light incident to the light guide assembly 103. The compensation light source may be used to complement the output light, and the compensation light source may be one or more of a blue light source, a red light source, or a green light source. The laser light source 101 may thus emit a mixed light, for example, the laser light source 101 may emit a mixed light of blue excitation light and red compensation light.

Preferably, the compensating light source is synchronized with the dispersing wheel 102 such that when the compensating light source is operated, the dispersing wheel 102 rotates to a region where light is incident on the light guide assembly 103. Therefore, the compensation light source can not work simultaneously with the excitation light source, and the compensation light source stops working when the compensation light source is not needed, so that energy is saved. Taking the example where the excitation light source emits 455nm blue excitation light and the compensation light source emits 638nm red compensation light, the transmission spectrum of the dichroic mirror 105 may be as shown in fig. 3, and the dichroic mirror 105 transmits light having wavelengths of 465nm or less and 630nm or more and reflects light having wavelengths between 465nm and 630nm so as to satisfy the conditions of transmission of the blue excitation light (455nm) and the red compensation light (638nm) and reflection of other light.

Optionally, the light splitting wheel 102 includes a motor and a circular structure formed by a plurality of fan-shaped pieces, the motor is connected with the circular structure, and the motor is used for driving the circular structure to rotate. The fan-shaped sheet can comprise lenses coated with different selective transmission films and/or lenses coated with antireflection films, and the lenses are used for transmitting exciting light or reflecting the exciting light so as to realize the separation of the exciting light. Alternatively, when the excitation light wavelength is 455nm, the dichroic wheel 102 includes a selective transmission film coated lens and an antireflection film coated lens, the transmission spectrum of the selective transmission film can be as shown in fig. 4, the selective transmission film reflects light with a wavelength below 465nm and transmits light with a wavelength above 465nm, that is, the selective transmission film coated lens can reflect excitation light, and the antireflection film coated lens can transmit excitation light, so that the dichroic wheel 102 realizes the separation of the excitation light.

Optionally, the light equalizing bar 104 includes a rectangular light equalizing bar or a tapered light equalizing bar, where both the light incident surface of the rectangular light equalizing bar and the light emergent surface of the rectangular light equalizing bar are rectangular, and the size of the light incident surface of the tapered light equalizing bar is greater than the size of the light emergent surface of the tapered light equalizing bar (as shown in fig. 2, the size of the left end surface of the tapered light equalizing bar is greater than the size of the right end surface of the tapered light equalizing bar). The conical light homogenizing rod can reduce the size of an emergent light spot, so that the subsequent light collection is facilitated, and the light utilization rate is improved.

Alternatively, the wavelength conversion device 106 may have a cylindrical shape (as shown in fig. 2) or a disk shape. Although the cylindrical wavelength conversion device 106 is disposed horizontally in fig. 2, the scope of the present invention is not limited thereto, and in other embodiments, the wavelength conversion device 106 may be disposed vertically according to the structural requirements.

In one possible implementation, as shown in fig. 2, the light-emitting device further includes a first lens 201, a second lens 202, and a third lens 203, the first lens 201 is disposed between the laser light source 101 and the beam splitter wheel 102, the second lens 202 is disposed between the light homogenizing rod 104 and the dichroic mirror 105, and the third lens 203 is disposed between the dichroic mirror 105 and the wavelength conversion device 106; the light guide member 103 includes a fourth lens 204, a first reflecting mirror 205, and a second reflecting mirror 206, which are arranged in this order in the traveling direction of the light. Specifically, the first lens 201, the second lens 202, the third lens 203, and the fourth lens 204 are all used for focusing and shaping light, and any one of the four lenses may be a single lens or a lens group composed of a plurality of lenses. Both the first mirror 205 and the second mirror 206 are used to change the propagation direction of the light; preferably, the first mirror 205 and the second mirror 206 are both 45 ° mirrors.

Fig. 5a is a schematic structural diagram of another beam splitter provided in an embodiment of the present invention, and fig. 5b is a schematic structural diagram of another wavelength conversion device provided in an embodiment of the present invention, in some possible embodiments, in order to output a set of time-sequential light, as shown in fig. 5a and fig. 5b, the beam splitter 102 includes a transmission region and a reflection region arranged along a circumferential direction thereof, the transmission region and the reflection region respectively correspond to different fan-shaped pieces, the transmission region is used for transmitting the excitation light to the dodging rod 104, and the reflection region is used for reflecting the excitation light to the light guiding component 103; the wavelength conversion device 106 includes a plurality of partitions (e.g., partition one, partition two, partition three, etc. in fig. 5 b); the dispersing wheel 102 rotates synchronously with the wavelength conversion device 106 such that the segments of the dispersing wheel 102 correspond to the segments of the wavelength conversion device 106.

For example, as shown in fig. 5b, the wavelength conversion device 106 includes a partition one, a partition two, and a partition three, the partition one being provided with a yellow wavelength conversion material, the partition two being a blank partition, the partition three being provided with a green wavelength conversion material; the beam splitting wheel 102 and the wavelength conversion device 106 rotate synchronously, so that when the beam splitting wheel 102 rotates to the reflection region, the wavelength conversion device 106 rotates to the second subarea; when the dichroic wheel 102 rotates to the transmissive region, the wavelength conversion device 106 rotates to the first or third sub-region. Thus, the light emitting device sequentially outputs sequential light of yellow light, blue light, and green light in cycles.

It should be noted that, although the transmission region of the dichroic wheel 102 is used for transmitting the excitation light to the dodging rod 104 and the reflection region of the dichroic wheel 102 is used for reflecting the excitation light to the light guiding component 103 in fig. 2, the present invention is not limited thereto, and in other embodiments, the transmission region of the dichroic wheel 102 may also be used for transmitting the excitation light to the light guiding component 103 and the reflection region of the dichroic wheel 102 is used for reflecting the excitation light to the dodging rod 104 as required.

Fig. 6a is a schematic structural diagram of another spectroscopic wheel provided by an embodiment of the present invention, and fig. 6b is a schematic structural diagram of another wavelength conversion device provided by an embodiment of the present invention, and in some possible embodiments, as shown in fig. 6a and fig. 6b, the spectroscopic wheel 102 includes a transmission region and a reflection region arranged along a circumferential direction thereof, the transmission region includes a transmission region or a scattering region, the transmission region is used for transmitting the excitation light to the light homogenizing rod 104, the scattering region is used for scattering the excitation light to the light homogenizing rod 104, and the reflection region is used for reflecting the excitation light to the light guiding component 103. Wherein, when the exciting light incides the scattering area, through the scattering of scattering area to the exciting light, even optical wand 104 can output more even facula, also is even optical wand 104 and the collocation use of the beam split wheel 102 that has the scattering area, even exciting light that can be better for inciting to the light on the wavelength conversion device more even, thereby can realize more even excitation, further improved wavelength conversion device's excitation efficiency.

Fig. 7a is a schematic structural diagram of another beam splitting wheel provided in an embodiment of the present invention, and fig. 7b is a schematic structural diagram of another wavelength conversion device provided in an embodiment of the present invention, in some possible embodiments, in order to reduce the requirement on the motor of the wavelength conversion device 106, as shown in fig. 7a and fig. 7b, the beam splitting wheel 102 includes a transmission region and a reflection region arranged along a circumferential direction thereof, the transmission region includes a transmission region or a scattering region, the transmission region is used for transmitting the excitation light to the dodging rod 104, the scattering region is used for scattering the excitation light to the dodging rod 104, and the reflection region is used for reflecting the excitation light to the light guide component 103; the wavelength conversion device 106 includes a wavelength conversion partition having a wavelength converting material disposed thereon. Thus, the wavelength conversion device 106 need not be synchronized with the dispersing wheel 102, reducing the motor requirements for the wavelength conversion device 106.

Alternatively, in the embodiment shown in fig. 7a and 7b, the excitation light is blue excitation light, and the wavelength converting sub-regions of the wavelength converting device 106 described above are provided with a wavelength converting material of yellow light. The blue excitation light thus incident on the wavelength conversion partition is converted into yellow stimulated light, and the yellow stimulated light and the blue excitation light output via the reflective region and the light guide member 103 may be used to synthesize white light.

Fig. 8a is a schematic structural diagram of another spectroscopic wheel provided by an embodiment of the present invention, and fig. 8b is a schematic structural diagram of another wavelength conversion device provided by an embodiment of the present invention, in some possible embodiments, in order to save cost, as shown in fig. 8a and fig. 8b, the spectroscopic wheel 102 includes a transmission region and a reflection region arranged along a circumferential direction thereof, the transmission region includes a transmission region or a scattering region, the transmission region is used for transmitting the excitation light to the light-uniformizing rod 104, the scattering region is used for scattering the excitation light to the light-uniformizing rod 104, and the reflection region is used for reflecting the excitation light to the light guide component 103; the wavelength conversion device 106 comprises at least one wavelength converting sub-section (only one wavelength converting sub-section is shown in fig. 8 b) on which the wavelength converting material is arranged, and one blank sub-section; the wavelength conversion device 106 rotates synchronously with the beam splitting wheel 102, so that when the beam splitting wheel 102 rotates to the reflection region, the wavelength conversion device 106 rotates to the blank region. Thus, the blank subareas corresponding to the reflecting areas are not coated with the wavelength conversion material, and the cost is saved.

Fig. 9a is a schematic structural diagram of another light splitting wheel provided in an embodiment of the present invention, and fig. 9b is a schematic structural diagram of another wavelength conversion device provided in an embodiment of the present invention, in some possible embodiments, in order to adjust the color of the output excitation light, as shown in fig. 9a and fig. 9b, the light splitting wheel 102 includes a transmission region disposed along a circumferential direction thereof and a partial transmission region coated with a semi-permeable membrane; the transmission region comprises a transmission region or a scattering region, the transmission region is used for transmitting the excitation light to the light homogenizing rod 104, the scattering region is used for scattering the excitation light to the light homogenizing rod 104, and the partial transmission region is used for transmitting part of the excitation light to the light homogenizing rod 104 and reflecting part of the excitation light to the light guide component 103; the wavelength conversion device 106 further comprises a first wavelength conversion sub-section and a second wavelength conversion sub-section, wherein the first wavelength conversion sub-section is provided with a first wavelength conversion material, and the second wavelength conversion sub-section is provided with a second wavelength conversion material; the wavelength conversion device 106 rotates synchronously with the beam splitting wheel 102 such that when the beam splitting wheel 102 rotates to a partially transmissive region, the wavelength conversion device 106 rotates to a second wavelength conversion sub-region.

Thus, when the light splitting wheel 102 rotates to the partial transmission region, part of the excitation light enters the light guiding assembly 103 and is transmitted through the dichroic mirror 105 to be output, the other part of the excitation light enters the dodging rod 104, and is finally converted into the excited light a by the second wavelength conversion partition of the wavelength conversion device 106 to be output, that is, the light emitting device outputs the mixed light formed by combining the excitation light and the excited light a (such as blue excited light with a wavelength of-465 nm and above), and the mixed light is output light required by people (such as blue light more suitable for projection), thereby realizing the adjustment of the color of the output excitation light. The proportion of the exciting light to the stimulated light A can be realized by coating of a partial transmission region, for example, the proportion of the exciting light transmission is 70%, the proportion of the exciting light reflection is 30%, and the blue light required by the Rec.709 color standard can be obtained after mixing. The transmission spectrum of the semi-permeable membrane in the partially transmissive region may be, for example

As shown in FIG. 10, the semi-permeable membrane has a 70% transmittance for light having a wavelength between 440nm and 470 nm.

Alternatively, in the embodiment shown in fig. 9a and 9b, the first wavelength conversion material comprises a yellow wavelength conversion material, the second wavelength conversion material comprises a blue wavelength conversion material, and the excitation light may be violet light or blue light with a shorter wavelength (e.g., 445nm or 455nm blue excitation light). Therefore, the adjustment of the color of the blue light is realized, and the output blue light is more suitable for projection of a projection system.

Fig. 11a is a schematic structural diagram of another light splitting wheel provided in an embodiment of the present invention, and fig. 11b is a schematic structural diagram of another wavelength conversion device provided in an embodiment of the present invention, in some possible embodiments, in order to achieve continuous multicolor light output, as shown in fig. 11a and fig. 11b, the light splitting wheel 102 includes a semi-permeable membrane-plated partial transmission region disposed along a circumferential direction thereof, and the wavelength conversion device 106 includes a wavelength conversion partition on which a wavelength conversion material is disposed.

In the embodiment shown in fig. 11a and 11b, after the excitation light is split by the splitting wheel 102, part of the excitation light is output through the light guide assembly 103 and the dichroic mirror 105, part of the excitation light is incident to the wavelength conversion device 106 through the light homogenizing rod 104 and the dichroic mirror 105, and is converted into stimulated excitation light after wavelength conversion by the wavelength conversion device 106, and the stimulated excitation light is output after being reflected by the wavelength conversion device 106 and the dichroic mirror 105 in sequence; that is, the light emitting device outputs polychromatic light (mixed light) composed of the excitation light and the excited light, and since the dichroic wheel 102 is a partially transmissive region in its entirety and the wavelength converting device 106 includes only one wavelength converting sub-region, the light emitting device outputs continuous polychromatic light, that is, continuous polychromatic light output is realized.

In the embodiments shown in fig. 11a and 11b, the color of the light output by the light emitting device can be changed by changing the wavelength converting material on the wavelength converting regions. For example, if the excitation light is blue light and the wavelength conversion material is a yellow wavelength conversion material, the light-emitting device outputs a continuous white mixed light composed of blue light and yellow light; if the excitation light is violet light or blue light with a shorter wavelength and the wavelength conversion material is a wavelength conversion material for blue light, the light-emitting device outputs continuous blue mixed light (more suitable for projection by a projection system).

The embodiment of the utility model provides a projection system is still provided, and this projection system includes foretell illuminator.

The projection system provided by the embodiment has the same implementation principle and technical effects as those of the foregoing embodiment of the light-emitting device, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing embodiment of the light-emitting device without reference to the embodiment of the projection system.

In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In addition, in the description of the embodiments of the present invention, 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific 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.

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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A light-emitting device is characterized by comprising a laser light source, a light splitting wheel, a light guide assembly, a light homogenizing rod, a dichroic mirror and a wavelength conversion device; the laser light source and the wavelength conversion device are respectively arranged at two sides of the dichroic mirror, the light splitting wheel is arranged between the laser light source and the dichroic mirror, the light homogenizing rod is arranged between the light splitting wheel and the dichroic mirror, and the light splitting wheel and the dichroic mirror are positioned at the same side of the light guide component;

2. The light-emitting device according to claim 1, wherein the light homogenizing bar comprises a rectangular light homogenizing bar or a tapered light homogenizing bar, the light incident surface of the rectangular light homogenizing bar and the light emergent surface of the rectangular light homogenizing bar are both rectangular, and the size of the light incident surface of the tapered light homogenizing bar is larger than that of the light emergent surface of the tapered light homogenizing bar.

3. The light-emitting device according to claim 1, wherein the dichroic wheel includes a transmissive region and a reflective region arranged along a circumferential direction thereof, the transmissive region being configured to transmit the excitation light to the light homogenizing rod, and the reflective region being configured to reflect the excitation light to the light guiding assembly.

4. The light-emitting device according to claim 3, wherein a selectively transmitting film is provided in the reflective region, and the selectively transmitting film reflects light having a wavelength of 465nm or less and transmits light having a wavelength of 465nm or more.

5. The light-emitting device according to claim 3, wherein the transmissive region comprises a transmissive region for transmitting the excitation light to the integrator rod or a scattering region for scattering the excitation light to the integrator rod.

6. A light emitting device according to claim 3, wherein said wavelength conversion means comprises a wavelength converting sub-section having a wavelength converting material disposed thereon.

7. The light emitting device of claim 3, wherein the wavelength conversion device comprises at least one wavelength conversion partition and one void partition, the wavelength conversion partition having a wavelength conversion material disposed thereon;

8. The light-emitting device according to claim 1, wherein the dichroic wheel includes a transmissive region and a partially transmissive region plated with a semi-permeable membrane, which are arranged in a circumferential direction thereof; the wavelength conversion device also comprises a first wavelength conversion subarea and a second wavelength conversion subarea, wherein a first wavelength conversion material is arranged on the first wavelength conversion subarea, and a second wavelength conversion material is arranged on the second wavelength conversion subarea;

9. The light-emitting device according to claim 8, wherein the first wavelength conversion material comprises a yellow wavelength conversion material, and wherein the second wavelength conversion material comprises a blue wavelength conversion material.

10. The light-emitting device according to claim 1, wherein the dichroic wheel includes a semi-permeable membrane coated partially transmissive region disposed along a circumferential direction thereof, and the wavelength conversion device includes a wavelength-converting sub-region on which a wavelength-converting material is disposed.

11. A light-emitting device according to any one of claims 8-10, wherein the semi-permeable membrane of the partially transmissive region has a transmittance of 70% for light having a wavelength between 440nm and 470 nm.

12. The lighting apparatus according to claim 1, wherein the laser light source comprises an excitation light source, or the laser light source comprises an excitation light source and a compensation light source; the excitation light source is used for emitting excitation light, the compensation light source is used for emitting compensation light, and the light splitting wheel is also used for enabling the compensation light to be incident to the light guide component; the wavelength conversion device is cylindrical or disc-shaped.

13. The lighting device according to claim 12, wherein the excitation light source emits 455nm blue excitation light, and the compensation light source emits 638nm red compensation light; the dichroic mirror transmits light having wavelengths below 465nm and above 630nm and reflects light having wavelengths between 465nm and 630 nm.

14. A projection system comprising a light-emitting device according to any one of claims 1 to 13.