CN216485954U

CN216485954U - Light-emitting device

Info

Publication number: CN216485954U
Application number: CN202122324579.5U
Authority: CN
Inventors: 杨炳柯; 方元戎; 郭祖强; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-05-10
Anticipated expiration: 2031-09-23

Abstract

The application discloses light emitting device, this light emitting device includes: a light emitting assembly for generating a light beam; the waveguide device is arranged on the optical path of the light beam and used for limiting the light beam with a large angle to propagate in the waveguide device, reducing the dilution of the optical expansion of the light beam and transmitting the light beam to a lower-level optical system. By arranging the waveguide device, the light beam is limited to be transmitted in the waveguide device, and the dilution of the optical expansion amount of the light beam can be reduced, so that the light intensity of the light beam received by the lower-level optical system is improved, and the efficiency of the optical system consisting of the light-emitting device and the lower-level optical system is improved.

Description

Light-emitting device

Technical Field

The present application relates to the field of optics, and more particularly, to a light emitting device.

Background

In the prior art, a micro projection Device provides red light, green light, and blue light through a light source of RGB three-color light, combines the light through a dichroic sheet, enters a light uniformizing Device, forms an image on a DMD (Digital Micromirror Device) through a lens assembly of an optical machine, and forms an image on a screen through a projection lens. Among them, in order to enable the micro-projection apparatus to realize projection in a smaller size and to have a portable function, the micro-projection apparatus uses a small-sized DMD and a small-sized lens. However, the smaller the lens size is, the larger the divergence angle of the light beam collimated and emitted by the collecting lens group is, the larger the cross-sectional area of the light beam on the light path from the lens to the fly eye is, thereby bringing about dilution of etendue, resulting in a decrease in the efficiency of the whole optical system.

SUMMERY OF THE UTILITY MODEL

The present application provides a light emitting device, including:

a light emitting assembly for generating a light beam;

the waveguide device is arranged on the optical path of the light beam and used for limiting the light beam with a large angle to propagate in the waveguide device, reducing the dilution of the optical expansion of the light beam and transmitting the light beam to a lower-level optical system.

Optionally, the waveguide means comprises at least one prism for totally reflecting the light beam such that the light beam is confined to propagate within the prism.

Optionally, the waveguide device comprises a first prism, a second prism, a third prism and a fourth prism arranged in sequence, the light-emitting device further comprises a first dichroic filter and a second dichroic filter,

the first dichroic filter is arranged between the first prism and the second prism, and the second dichroic filter is arranged between the third prism and the fourth prism.

Optionally, the light emitting assembly comprises a first light emitting assembly, a second light emitting assembly and a third light emitting assembly,

the first light-emitting assembly is used for generating a first light beam, and the first light beam is transmitted to the lower-stage optical system through the first prism, the first dichroic filter, the second prism, the third prism, the second dichroic filter and the third prism in sequence;

the second light-emitting component generates a second light beam, and the second light beam is transmitted to the lower-stage optical system through the second prism, the first dichroic sheet, the second prism, the third prism, the second dichroic sheet and the third prism in sequence;

the third light-emitting component generates a third light beam, and the third light beam is transmitted to the lower-stage optical system through the fourth prism, the second dichroic sheet and the third prism in sequence.

Optionally, the first prism, the first dichroic filter, the second prism, the third prism, the second dichroic filter, and the fourth prism are sequentially disposed adjacent to each other.

Optionally, the first dichroic filter is configured to transmit the first light beam and reflect the second light beam;

the second dichroic plate is used for transmitting the third light beam and reflecting the first light beam and the second light beam.

Optionally, the light emitting assembly further includes a fourth light emitting assembly, the fourth light emitting assembly is configured to generate first excitation light, the first excitation light is transmitted to the first dichroic filter through the first prism, and the first dichroic filter reflects the first excitation light, so that the first excitation light is transmitted to the first light emitting assembly through the first prism, so as to excite the first light emitting assembly to generate the first light beam.

Optionally, the waveguide device comprises at least two mirrors for reflecting the light beam such that the light beam is confined to propagate within the waveguide device formed by the at least two mirrors.

Optionally, the waveguide device includes a first mirror and a second mirror disposed opposite to each other, and a line connecting a center of the first mirror and a center of the second mirror is perpendicular to the light beam exiting direction.

Optionally, the waveguide device comprises a first mirror, a second mirror, a third mirror, a fourth mirror and a fifth mirror, the light-emitting device further comprises a first dichroic filter and a second dichroic filter,

the first reflector, the first dichroic filter, the third reflector and the second dichroic filter are sequentially arranged in a first direction;

the second reflector, the first dichroic filter and the fifth reflector are sequentially arranged in a second direction, and the second direction is perpendicular to the first direction;

the second dichroic sheet, the fourth reflector and the lower optical system are sequentially arranged in the second direction.

the first light-emitting assembly is used for generating a first light beam, and the first light beam is transmitted to the lower-stage optical system through the first reflector, the first dichroic filter, the third reflector, the second dichroic filter and the fourth reflector in sequence;

the second light-emitting component is used for generating a second light beam, and the second light beam is transmitted to the lower-stage optical system through the second reflector, the first dichroic filter, the third reflector, the second dichroic filter and the fourth reflector in sequence;

the third light-emitting component is used for generating a third light beam, and the third light beam is transmitted to the lower-stage optical system through the second dichroic sheet and the fourth reflector in sequence;

the first dichroic filter is used for transmitting the first light beam and reflecting the second light beam, and the second dichroic filter is used for transmitting the third light beam and reflecting the first light beam and the second light beam.

Optionally, the light emitting assembly further comprises a fourth light emitting assembly,

the fourth light emitting component is used for generating first exciting light, the first exciting light is transmitted to the first dichroic filter through the fifth reflecting mirror, and the first dichroic filter reflects the first exciting light to enable the first exciting light to be transmitted to the first light emitting component through the first reflecting mirror so as to excite the first light emitting component to generate first light beams.

Optionally, the waveguide device comprises a sixth mirror and a seventh mirror, the light emitting device further comprises a third dichroic plate, the third dichroic plate being disposed between the sixth mirror and the seventh mirror;

the light emitting assembly comprises a fifth light emitting assembly, the fifth light emitting assembly is used for generating a fourth light beam, and the third dichroic film transmits the fourth light beam so as to transmit the fourth light beam to the lower-stage optical system;

the light emitting assembly further comprises a sixth light emitting assembly, the sixth light emitting assembly is used for generating second exciting light, the second exciting light is transmitted to the third dichroic sheet through the sixth reflecting mirror, and the third dichroic sheet reflects the second exciting light so that the second exciting light is transmitted to the fifth light emitting assembly to excite the fifth light emitting assembly to generate a fourth light beam.

The beneficial effect of this application is: different from the prior art, the light source device limits the light beam to be transmitted in the waveguide device by arranging the waveguide device, and can reduce the dilution of the optical expansion amount of the light beam so as to improve the light intensity of the light beam received by the lower optical system and improve the efficiency of the optical system consisting of the light emitting device and the lower optical system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced 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-emitting device according to a first embodiment of the present application;

FIG. 2 is a schematic structural diagram of a second embodiment of a light-emitting device according to the present application;

FIG. 3 is a schematic structural diagram of a third embodiment of a light-emitting device according to the present application;

FIG. 4 is a schematic structural diagram of a fourth embodiment of a light-emitting device of the present application;

FIG. 5 is a schematic structural diagram of a fifth embodiment of a light-emitting device according to the present application;

FIG. 6 is a schematic structural diagram of a sixth embodiment of a light-emitting device of the present application;

FIG. 7 is a schematic structural diagram of a seventh embodiment of a light-emitting device according to the present application;

fig. 8 is a schematic structural diagram of an eighth embodiment of a light-emitting device according to the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions of the present application, the light emitting device provided in the present application is described in further detail below with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe 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 present application provides a light emitting device to solve the problem that the divergence angle of a light beam generated by a light source in a micro projection device is too large, and further dilution of etendue is brought, and the following embodiments specifically show the light emitting device.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a light emitting device according to a first embodiment of the present application. As shown in fig. 1, the light-emitting device 1 includes a light-emitting element 10 and a waveguide device 20.

Wherein, the light emitting assembly 10 is used for generating a light beam; the waveguide device 20 is disposed on an optical path of the light beam for confining the light beam to propagate within the waveguide device 20 to transmit the light beam to the lower-stage optical system 2.

In this embodiment, the lower optical system 2 may comprise a light uniformizing device, in particular a fly eye lens.

Specifically, the light beam generated by the light emitting assembly 10 is a wide light beam, i.e., the divergence angle of the light beam is large. When the light beam is transmitted to the waveguide device 20, the waveguide device 20 limits the light beam with a large angle to propagate in the waveguide device 20, thereby reducing the dilution of the optical expansion of the light beam, so as to improve the light intensity of the light beam received by the lower optical system 2, and further improve the efficiency of the optical system composed of the light emitting device 1 and the lower optical system 2.

Referring to fig. 2 in addition to fig. 1, fig. 2 is a schematic structural diagram of a light emitting device according to a second embodiment of the present application. As shown in fig. 2, the waveguide device 20 comprises at least one prism for totally reflecting the received light beam.

Specifically, before the waveguide device 20 is not provided, the light emitting module 10 emits a light beam with a large angle, and since the divergence angle of the light beam is large, the light beam cannot be completely transmitted into the lower optical system 2, and a part of the light beam is transmitted to the outside of the lower optical system 2, which causes a loss.

After the waveguide device 20 is disposed, the waveguide device 20 is close to the light emitting component 10, the light beam emitted by the light emitting component 10 with a large angle is totally transmitted to the reflective waveguide device 20, which is a prism, and the waveguide device 20 totally reflects the light beam to change the transmission angle of the light beam, so that the light beam with a large angle is limited to propagate in the waveguide device 20.

Referring to fig. 3 in addition to fig. 1-2, fig. 3 is a schematic structural diagram of a light emitting device according to a third embodiment of the present application. As shown in fig. 3, in the second embodiment, the waveguide device 20 includes a first prism 21, a second prism 22, a third prism 23 and a fourth prism 24 which are adjacently arranged in sequence, and the light-emitting device 1 further includes a first dichroic plate 31 and a second dichroic plate 32. The first dichroic filter 31 is disposed between the first prism 21 and the second prism 22, and the second dichroic filter 32 is disposed between the third prism 23 and the fourth prism 24.

Optionally, in this embodiment, the first prism 21, the third prism 23, and the fourth prism 24 are triangular prisms, and the second prism 22 is a quadrangular prism. Alternatively, in other embodiments, the second prism 22 and the third prism 23 may be formed by one parallelogram prism.

The light emitting assembly 10 includes a first light emitting assembly 11, and the first light emitting assembly 11 is configured to generate a first light beam S1. The first light emitting assembly 11 includes a first light source 111 and a first collimating lens 112.

In the present embodiment, the first light source 111 is a green light source for generating green light, i.e., the first light beam S1 is green light. Specifically, the first light source 111 may be a green LED or a green LD.

The first collimating lens 112 is a plano-convex mirror, and is used for collimating the first light beam S1 to make the first light beam S1 generated by the first light source 111 parallel and uniform in a longer distance range, so that the first light beam S1 is narrowed.

Specifically, the first light beam S1 is transmitted to the lower optical system 2 through the first prism 21, the first dichroic filter 31, the second prism 22, the third prism 23, the second dichroic filter 32, and the third prism 23 in this order.

The light emitting assembly 10 includes a second light emitting assembly 12, and the second light emitting assembly 12 is used for generating a second light beam S2. The second light emitting assembly 12 includes a second light source 121 and a second collimating lens 122.

In the present embodiment, the second light source 121 is a blue light source for generating blue light, i.e. the second light beam S2 is blue light. Specifically, the second light source 121 may be a blue LED or a blue LD.

The second collimating lens 122 is a plano-convex mirror, and is used for collimating the second light beam S2 to make the second light beam S2 generated by the second light source 121 parallel and uniform in a longer distance range, so that the second light beam S2 is narrowed.

Specifically, the second light beam S2 is transmitted to the lower optical system 2 through the second prism 22, the first dichroic filter 31, the second prism 22, the third prism 23, the second dichroic filter 32, and the third prism 23 in this order.

The light emitting assembly 10 comprises a third light emitting assembly 13, and the third light emitting assembly 13 is used for generating a third light beam S3. The third light emitting assembly 13 includes a third light source 131 and a third collimating lens 132.

In the present embodiment, the third light source 131 is a red light source for generating red light, i.e. the third light beam S3 is red light. Specifically, the third light source 131 may be a red LED or a red LD.

The third collimating lens 132 is a plano-convex mirror, and is used for collimating the third light beam S3 to make the third light beam S3 generated by the third light source 131 parallel and uniform in a longer distance range, so that the third light beam S3 is narrowed.

Specifically, the third light beam S3 is transmitted to the lower optical system 2 sequentially through the fourth prism 24, the second dichroic sheet 32, and the third prism 23.

Further, the first light emitting assembly 11, the first prism 21, the first dichroic filter 31, the second prism 22, the third prism 23, the second dichroic filter 32, and the fourth prism 24 are disposed along the first direction X;

the second light emitting assembly 12, the second prism 22, the first dichroic filter 31, and the first prism 21 are disposed along the second direction Y;

the third light emitting element 13, the fourth prism 24, the second dichroic sheet 32, the third prism 23, and the lower optical system 2 are arranged in the second direction Y;

wherein the first direction X is perpendicular to the second direction Y, and the first dichroic filter 31 is configured to transmit the first light beam S1 and reflect the second light beam S2; the second dichroic plate 32 is used for transmitting the third light beam S3 and reflecting the first light beam S1 and the second light beam S2.

Since the light emitting surfaces of the first light beam S1, the second light beam S2 and the third light beam S3 generated by the first light emitting assembly 11, the second light emitting assembly 12 and the third light emitting assembly 13 respectively can be rectangular or circular, and the cross sections of the first prism 21, the second prism 22, the third prism 23 and the fourth prism 24 can be set to be square or circular, when different light emitting surfaces are combined with different waveguide cross sections, the dilution of the optical expansion amount of the light beam passing through the corresponding waveguide device 20 is different. Taking the first light emitting assembly 11 and the first prism 21 as an example, the analysis is as follows:

when the light emitting surface of the first light beam S1 is rectangular and the waveguide cross section of the first prism 21 is square:

after the first light beam S1 passes through the first collimating lens 112, the cross section of the first light beam S1 is circular, and the divergence angle distribution is rectangular; after the first light beam S1 passes through the first prism 21, the divergence angle of the first light beam S1 is unchanged, and the cross section becomes a square shape identical to the cross section of the first prism 21, so that the dilution of the etendue of the first light beam S1 is η 1.41.

(II) when the light emitting surface of the first light beam S1 is rectangular and the waveguide cross section of the first prism 21 is circular:

after the first light beam S1 passes through the first collimating lens 112, the cross section of the first light beam S1 is circular, and the divergence angle distribution is rectangular; after the first light beam S1 passes through the first prism 21, the cross section of the first light beam S1 is notConsidering the influence of factors such as installation tolerance, the divergence angle is theoretically constant, the divergence angle is changed into a circumscribed circle of a rectangular distribution before the incident waveguide, and the length-width ratio of the rectangular light emitting surface is defined as c, so that the optical expansion of the first light beam S1 is diluted to

When c is 1, the dilution amount is 1.57.

(iii) when the light emitting surface of the first light beam S1 is circular and the waveguide cross section of the first prism 21 is circular:

after the first light beam S1 passes through the first collimating lens 112, the cross section of the first light beam S1 is circular, and the divergence angle distribution is rectangular; after the first light beam S1 passes through the first prism 21, the cross section of the first light beam S1 is theoretically unchanged without considering the influence of factors such as installation tolerance, and the divergence angle is also unchanged, so the expansion of the circular light emitting surface and the circular waveguide is theoretically not diluted.

Therefore, the first light emitting element 11, the second light emitting element 12, the third light emitting element 13, the first prism 21, the second prism 22, the third prism 23 and the fourth prism 24 with different shapes can be selected according to the shape of the effective surface of the spatial light processor DMD in the micro projection device and the requirement of the etendue of the light beam.

Referring to fig. 4 in addition to fig. 1-3, fig. 4 is a schematic structural diagram of a fourth embodiment of a light emitting device of the present application. On the basis of the third embodiment, the light emitting device 1 of the present embodiment further includes a fourth light emitting element 14.

As shown in fig. 4, the fourth light emitting element 14 is configured to generate first excitation light, the first excitation light is transmitted to the first dichroic filter 31 through the first prism 21, and the first dichroic filter 31 reflects the first excitation light, so that the first excitation light is transmitted to the first light emitting element 11 through the first prism 21, so as to excite the first light emitting element 11 to generate the first light beam S1.

Specifically, the second light emitting element 12, the second prism 22, the first dichroic filter 31, the first prism 21, and the fourth light emitting element 14 are disposed along the second direction Y.

The fourth light emitting assembly 14 includes a fourth light source 141 and a fourth collimating lens 142.

Optionally, in this embodiment, the fourth light source 141 is a blue light source for generating blue light, that is, the first excitation light is blue light. Specifically, the fourth light source 141 may be a blue LED or a blue LD. At this time, the first light emitting assembly 11 is a wavelength conversion device, specifically, green phosphor, and when the first light emitting assembly 11 receives the blue light emitted by the fourth light source 141, it is excited to generate green light.

The fourth collimating lens 142 is a plano-convex lens, and is configured to collimate the first excitation light, so that the first excitation light generated by the fourth light source 141 is parallel and uniform in a longer distance range, and the first excitation light is narrowed.

Referring to fig. 5 in addition to fig. 1, fig. 5 is a schematic structural diagram of a fifth embodiment of a light emitting device according to the present application. As shown in fig. 5, the waveguide device 20 includes at least two mirrors for reflecting the light beam generated by the light emitting assembly 10, so that the light beam is confined to propagate within the waveguide device 20 formed by the at least two mirrors.

Specifically, the first light beam S1 generated by the first light emitting assembly 11 is a large-angle light beam, and the incident angle of the light beam on the two mirrors is large; meanwhile, the two reflectors can reflect the light beams incident at a large angle to the rear light path, so that the first light beam S1 is reflected by the two reflectors and is transmitted between the two reflectors to enter the rear light path, and the loss of the light beams is avoided.

Optionally, in this embodiment, the at least two mirrors include a first mirror and a second mirror. The first reflector and the second reflector are oppositely arranged, and the connecting line direction of the center of the first reflector and the center of the second reflector is perpendicular to the emergent direction of the light beam generated by the light-emitting component 10.

Referring to fig. 6 in combination with fig. 1 and fig. 5, fig. 6 is a schematic structural diagram of a sixth embodiment of a light emitting device according to the present application. In the present embodiment, the first light emitting device 11, the second light emitting device 12, the third light emitting device 13, the first dichroic filter 31, and the second dichroic filter 32 have the same structure as that disclosed in the third embodiment, and the directions of the first direction X and the second direction Y are the same as that disclosed in the third embodiment.

In addition to the fifth embodiment, the waveguide device 20 of the present embodiment includes a first reflecting mirror 41, a second reflecting mirror 42, a third reflecting mirror 43, a fourth reflecting mirror 44 and a fifth reflecting mirror 45. Alternatively, in the present embodiment, the first reflector 41, the second reflector 42, the third reflector 43, the fourth reflector 44 and the fifth reflector 45 may be flat glass or high-reflective aluminum plate.

Alternatively, in other embodiments, the first reflector 41, the second reflector 42, the third reflector 43, the fourth reflector 44, and the fifth reflector 45 may be window glass, and the window glass is coated with an optical film, through which the light beams incident at a small angle can be transmitted and the light beams incident at a large angle can be reflected. Specifically, the small angle may be from 0 ° to 15 °, and the large angle may be from 75 ° to 90 °.

The first dichroic filter 31 is disposed between the fifth reflecting mirror 45 and the second reflecting mirror 42, and between the first reflecting mirror 41 and the third reflecting mirror 43, the third reflecting mirror 43 is disposed between the second dichroic filter 32 and the first dichroic filter 31, and the fourth reflecting mirror 44 is disposed between the second dichroic filter 32 and the lower-stage optical system 2.

Specifically, the first light emitting assembly 11, the first reflecting mirror 41, the first dichroic filter 31, the third reflecting mirror 43, and the second dichroic filter 32 are sequentially disposed in the first direction X.

The second light emitting element 12, the second reflector 42, the first dichroic filter 31, and the fifth reflector 45 are sequentially disposed in the second direction Y.

The third light emitting element 13, the second dichroic plate 32, the fourth reflecting mirror 44, and the lower optical system 2 are sequentially disposed in the second direction Y.

Specifically, the first light beam S1 generated by the first light emitting element 11 passes through the first reflecting mirror 41, the first dichroic filter 31, the third reflecting mirror 43, the second dichroic filter 32, and the fourth reflecting mirror 44 in order to be transmitted to the lower optical system 2.

The second light beam S2 generated by the second light emitting device 12 is transmitted to the lower optical system 2 sequentially through the second reflector 42, the first dichroic filter 31, the third reflector 43, the second dichroic filter 32, and the fourth reflector 44.

The third light beam S3 generated by the third light-emitting assembly 13 is transmitted to the lower optical system 2 sequentially through the second dichroic sheet 32 and the fourth reflecting mirror 44.

Referring to fig. 7 in combination with fig. 1, fig. 5 and fig. 6, fig. 7 is a schematic structural diagram of a seventh embodiment of a light emitting device of the present application. In addition to the sixth embodiment, the light emitting device 1 of the present embodiment further includes a fourth light emitting element 14.

As shown in fig. 7, the fourth light emitting element 14 is configured to generate first excitation light, the first excitation light is transmitted to the first dichroic filter 31 through the fifth reflector 45, and the first dichroic filter 31 reflects the first excitation light, so that the first excitation light is transmitted to the first light emitting element 11 through the first reflector 41, so as to excite the first light emitting element 11 to generate the first light beam S1.

Specifically, the second light emitting element 12, the second reflector 42, the first dichroic filter 31, the fifth reflector 45 and the fourth light emitting element 14 are disposed along the second direction Y.

Specifically, the first light beam S1 is reflected by the second mirror 42, the third mirror 43, the fourth mirror 44 and the fifth mirror 45, the second light beam S2 is reflected by the second mirror 42, the third mirror 43 and the fourth mirror 44, the third light beam S3 is reflected by the third mirror 43 and the fourth mirror 44, and the first excitation light is reflected by the first mirror 41 and the fifth mirror 45 to enter a rear optical path, so that the loss of the light beam is avoided.

Referring to fig. 8 in combination with fig. 1 and fig. 5, fig. 8 is a schematic structural diagram of an eighth embodiment of a light emitting device according to the present application. As shown in fig. 8, in the fifth embodiment, the waveguide device 20 includes a sixth reflecting mirror 51 and a seventh reflecting mirror 52, the light-emitting device 1 further includes a third dichroic plate 33, and the third dichroic plate 33 is disposed between the sixth reflecting mirror 51 and the seventh reflecting mirror 52.

The light emitting assembly 10 includes a fifth light emitting assembly 15, the fifth light emitting assembly 15 is used for generating a fourth light beam S4, and the third dichroic plate 33 transmits the fourth light beam S4 so that the fourth light beam S4 is transmitted to the lower optical system 2.

The fifth light emitting assembly 15 includes a fifth light source 151 and a fifth collimating lens 152.

Specifically, the fifth collimating lens 152 is a plano-convex mirror for collimating the fourth light beam S4 to make the fourth light beam S4 generated by the fifth light source 151 parallel and uniform over a longer distance, so that the fourth light beam S4 is narrowed.

The light emitting device 10 further includes a sixth light emitting device 16, the sixth light emitting device 16 is configured to generate second excitation light, the second excitation light is transmitted to the third dichroic plate 33 through the sixth reflecting mirror 51, the third dichroic plate 33 reflects the second excitation light, so that the second excitation light is transmitted to the fifth light emitting device 15, so as to excite the fifth light emitting device 15 to generate a fourth light beam S4.

The sixth light emitting assembly 16 includes a sixth light source 161 and a light uniformizing device 162. Specifically, the light uniformizing device 162 may be a fly-eye lens or a diffuser.

In the present embodiment, the sixth light source 161 is a blue light source for generating blue light, i.e. the second excitation light is blue light. Specifically, the sixth light source 161 may be a blue LD or a blue LED having a wavelength of 445nm-465 nm.

The fifth light source 151 is a yellow light source for generating yellow light, i.e., the fourth light beam S4 is yellow light. Specifically, the fifth light source 151 is a yellow light wavelength conversion device, and may be a yellow fluorescent wheel or a yellow fluorescent powder sheet.

Since the third dichroic sheet 33 reflects the second excitation light and transmits the fourth light beam S4, and the second excitation light is blue light, and the fourth light beam S4 is yellow light, the third dichroic sheet 33 is a dichroic sheet that reflects blue light and transmits yellow light.

Alternatively, in the present embodiment, the sixth reflecting mirror 51 may be a dichroic sheet that reflects yellow light and transmits blue light; the seventh mirror 52 may be a flat glass, a high-reflection aluminum, or a glass prism, etc.

Wherein the sixth light emitting assembly 16, the sixth reflector 51, the third dichroic sheet 33, and the seventh reflector 52 are disposed along the first direction X; the fifth light emitting assembly 15, the third dichroic sheet 33, and the lower optical system 2 are disposed along the second direction Y.

Specifically, the sixth light source 161 generates blue light, the sixth reflecting mirror 51 transmits the blue light, and the third dichroic sheet 33 reflects the blue light, so that the blue light is transmitted to the fifth light emitting assembly 15; the fifth light emitting element 15 receives the blue light and is excited to generate yellow light, and the third dichroic sheet 33 transmits the yellow light to transmit the yellow light to the lower optical system 2.

The fourth light beam S4 generated by the fifth light emitting element 15 is reflected by the sixth reflector 51 and the seventh reflector 52, so that the fourth light beam S4 enters the rear light path, thereby avoiding the loss of the light beam.

The light emitting device 1 of the present embodiment can be applied to the existing laser fluorescence light source, and the sixth mirror 51 and the seventh mirror 52 are provided to limit the diffusion of the fourth light beam S4 generated by the fifth light source 151 of the excited light. The size of the fifth collimating lens 152 can be reduced while maintaining the efficiency of the projection apparatus composed of the light emitting device 1 and the lower optical system 2, thereby reducing the volume of the light emitting device 1 and the volume of the projection apparatus.

When the light emitting device 1 of the present application is applied to a micro projection device, the waveguide device 20 is disposed to limit the light beam from propagating in the waveguide device 20, so as to reduce the dilution of the optical expansion of the light beam, thereby improving the light intensity of the light beam received by the lower optical system 2 and improving the efficiency of the optical system composed of the light emitting device 1 and the lower optical system 2.

When the light emitting device 1 of the present application is applied to a general projection device, the sixth mirror 51 and the seventh mirror 52 are arranged to limit the diffusion of the fourth light beam S4 generated by the fifth light source 151 of the excited light, so as to reduce the size of the light emitting device 1 and the size of the projection device while maintaining the efficiency of the projection device composed of the light emitting device 1 and the lower optical system 2.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. A light-emitting device, comprising:

a light emitting assembly for generating a light beam;

the waveguide device is arranged on the optical path of the light beam and is used for limiting the light beam with large angle to propagate in the waveguide device, and the dilution of the optical expansion of the light beam is reduced so as to transmit the light beam to a lower-stage optical system.

2. The light-emitting device according to claim 1, wherein the waveguide device comprises at least one prism for totally reflecting the light beam so as to limit the light beam to propagate in the prism.

3. The light-emitting device according to claim 2, wherein the waveguide device comprises a first prism, a second prism, a third prism and a fourth prism arranged in this order, the light-emitting device further comprises a first dichroic filter and a second dichroic filter,

the first dichroic filter is disposed between the first prism and the second prism, and the second dichroic filter is disposed between the third prism and the fourth prism.

4. The apparatus of claim 3, wherein the light-emitting assembly comprises a first light-emitting assembly, a second light-emitting assembly and a third light-emitting assembly,

the first light-emitting component is used for generating a first light beam, and the first light beam is transmitted to the lower-stage optical system sequentially through the first prism, the first dichroic filter, the second prism, the third prism, the second dichroic filter and the third prism;

the second light-emitting component generates a second light beam, and the second light beam is transmitted to the lower-stage optical system sequentially through the second prism, the first dichroic filter, the second prism, the third prism, the second dichroic filter and the third prism;

the third light emitting assembly generates a third light beam, and the third light beam is transmitted to the lower optical system through the fourth prism, the second dichroic sheet and the third prism in sequence.

5. The light-emitting device according to claim 4, wherein the first prism, the first dichroic filter, the second prism, the third prism, and the second dichroic filter are disposed adjacent to the fourth prism in this order.

6. The lighting device according to claim 4,

the first dichroic filter is used for transmitting the first light beam and reflecting the second light beam;

7. The apparatus as claimed in claim 4, wherein the light-emitting assembly further comprises a fourth light-emitting assembly for generating a first excitation light, the first excitation light is transmitted to the first dichroic filter through the first prism, the first dichroic filter reflects the first excitation light, and the first excitation light is transmitted to the first light-emitting assembly through the first prism to excite the first light-emitting assembly to generate the first light beam.

8. The light-emitting device according to claim 1, wherein the waveguide device comprises at least two mirrors for reflecting the light beam so that the light beam is confined to propagate within the waveguide device formed by the at least two mirrors.

9. The light-emitting device according to claim 8, wherein the waveguide device comprises a first reflector and a second reflector which are oppositely arranged, and a direction of a line connecting a center of the first reflector and a center of the second reflector is perpendicular to an exit direction of the light beam.

10. The light-emitting device according to claim 8, wherein the waveguide device comprises a first reflector, a second reflector, a third reflector, a fourth reflector, and a fifth reflector, the light-emitting device further comprises a first dichroic filter and a second dichroic filter,

the second dichroic sheet, the fourth mirror, and the lower optical system are sequentially disposed in the second direction.

11. The apparatus of claim 10, wherein the light-emitting assembly comprises a first light-emitting assembly, a second light-emitting assembly and a third light-emitting assembly,

the first light-emitting component is used for generating a first light beam, and the first light beam is transmitted to the lower-stage optical system through the first reflector, the first dichroic filter, the third reflector, the second dichroic filter and the fourth reflector in sequence;

wherein the first dichroic filter is configured to transmit the first light beam and reflect the second light beam, and the second dichroic filter is configured to transmit the third light beam and reflect the first and second light beams.

12. The lighting apparatus according to claim 11, wherein the light emitting assembly further comprises a fourth light emitting assembly,

the fourth light emitting component is used for generating first exciting light, the first exciting light is transmitted to the first dichroic filter through the fifth reflecting mirror, and the first dichroic filter reflects the first exciting light, so that the first exciting light is transmitted to the first light emitting component through the first reflecting mirror, and the first light emitting component is excited to generate the first light beam.

13. The light-emitting device according to claim 8, wherein the waveguide device comprises a sixth mirror and a seventh mirror, the light-emitting device further comprising a third dichroic plate disposed between the sixth mirror and the seventh mirror;

the light emitting assembly comprises a fifth light emitting assembly for generating a fourth light beam, the third dichroic sheet transmitting the fourth light beam for transmission to the lower optical system;

the light emitting assembly further comprises a sixth light emitting assembly, the sixth light emitting assembly is used for generating second excitation light, the second excitation light is transmitted to the third dichroic plate through the sixth reflecting mirror, the third dichroic plate reflects the second excitation light, and the second excitation light is transmitted to the fifth light emitting assembly so as to excite the fifth light emitting assembly to generate the fourth light beam.