CN102929086B - Light emitting device and related projection system - Google Patents

Abstract

The embodiment of the present invention discloses a light emitting device and a projection system, which are characterized in that they include: a laser diode array, including a first laser diode and a second laser diode that respectively emit a first laser and a second laser. The wavelength conversion device of the wavelength conversion material is provided, the first surface of the wavelength conversion device receives the laser light, the wavelength conversion material absorbs the laser light to generate the received light and emits it. A light guiding system comprising a first type of component and a second type of component surrounding it, the first guiding element and the second guiding element in the first type of component respectively guide the first laser light and the second laser light incident on the first surface. The second type of component guides the outgoing light from the first surface to exit and separates from the laser light path, and the luminous flux of the outgoing light guided by the second type of component is greater than the luminous flux guided by the first type of component. Embodiments of the present invention provide a light emitting device that separates most of the outgoing light of the reflective wavelength conversion device from the laser light path incident on the wavelength conversion device.

Description

Lighting device and related projection system

technical field

The invention relates to the technical field of illumination and display, in particular to a light emitting device and a related projection system.

Background technique

Laser light source is a new type of light source with high brightness and high collimation, and has been gradually applied to various fields such as lighting and projection. FIG. 1 is a light emitting device including a laser light source that can be applied in the field of lighting and projection. As shown in FIG. , lens 160. Wherein, the laser light source 110 includes a laser diode array 111 and a collimating lens array 112 , and the emitted light of the laser diode array 111 is collimated by the collimating lens array 112 before being emitted. The outgoing light of the collimator lens array 112 is focused by the lens 120 and then enters the lens 130 to become parallel light, and the parallel light passes through the filter 140 and is focused onto the wavelength conversion device 150 by the lens 160 . The wavelength conversion device 150 includes a wavelength conversion material, which can convert the incident laser light into the received light and emit it toward the lens 160 . The emitted light from the wavelength conversion device 160 is collected by the lens 160 and then emitted to the filter 140 and reflected by the filter before being emitted. The light-emitting device 100 utilizes the laser light source 110 to excite the wavelength conversion material in the wavelength conversion device 150 to generate high-brightness outgoing light, but the problem is that for a light-emitting device that requires part of the laser component in the outgoing light, since the light-emitting device 100 uses a filter The optical sheet 140 separates the optical paths of the laser light and the received light with different wavelengths, so it cannot meet the requirement that the outgoing light includes the laser component. On the other hand, due to the large light-emitting area of the laser array, the output beam needs to be compressed, which requires additional optical elements and increases the volume of the light-emitting device. It is not suitable for some occasions that have strict requirements on the volume of the light-emitting device.

Contents of the invention

The technical problem mainly solved by the present invention is to provide a light-emitting device with a reflective wavelength conversion device, which can separate most of the emitted light from the wavelength conversion device from the optical path of the laser light incident on the wavelength conversion device.

An embodiment of the present invention provides a light emitting device, which is characterized in that it includes:

A light emitting device, characterized in that it comprises:

A laser diode array, the laser diode array includes a first laser diode and a second laser diode, respectively emitting the first laser and the second laser;

A wavelength conversion device provided with a wavelength conversion material, the wavelength conversion device includes a first surface, the first surface is used to receive the first laser light and the second laser light, and the wavelength conversion material absorbs the first laser light and the second laser light to generate the received laser light , the mixed light of the absorbed laser light and the unabsorbed laser light is at least partially emitted from the first surface;

A light guiding system located on the optical path between the laser diode array and the wavelength conversion device, the light guiding system includes a first type of component and a second type of component surrounding the first type of component:

The first type of assembly includes a first guide element and a second guide element, the first guide element is used to guide the first laser light to be incident on the first surface of the wavelength conversion device, and the second guide element is used to guide the second laser light to be incident on the wavelength conversion device the first surface of

The second type of component is used to guide part of the outgoing light on the first surface of the wavelength conversion device to exit and separate from the laser light path, and the luminous flux of the outgoing light on the first surface guided by the second type of component is greater than that of the first surface guided by the first type of component. of the outgoing luminous flux.

The present invention also provides a projection system, which includes the above light emitting device

Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

In the embodiment of the present invention, the first type of component is used to guide the laser light to be incident on the first surface of the wavelength conversion device to generate the received light. Since the etendue of the outgoing light of the first surface of the wavelength conversion device is larger than that of the laser light emitted by the laser diode array The etendue is large, so the light emitted from the first surface of the wavelength conversion device will not only be guided by the first type of components to the laser diode array and lost, but also be guided by the second type of components surrounding the first type of components. As the outgoing light of the light-emitting device; further, by controlling the luminous flux of the outgoing light of the first surface guided by the second type of component to be greater than the luminous flux of the outgoing light of the first surface guided by the first type of component, thereby realizing most of the wavelength conversion device The outgoing light is separated from the optical path of the laser light incident on the wavelength conversion device.

Description of drawings

Fig. 1 is a structural front view of an embodiment of a light emitting device in the prior art;

Figure 2a is a schematic structural view of an embodiment of the light emitting device of the present invention;

Fig. 2b is a partial structural schematic diagram of the light emitting device shown in Fig. 2a;

Fig. 3a is a front view of another embodiment of the light emitting device of the present invention;

Fig. 3b is a left side view of the wavelength conversion layer of the light emitting device shown in Fig. 3a;

Fig. 3c is a front view of another embodiment of the light emitting device of the present invention;

Fig. 3d is a left view of a structure of a wavelength conversion layer and a filter device of the light-emitting device shown in Fig. 3c;

Fig. 3e is a left view of another structure of the wavelength conversion layer and the filter device of the light emitting device shown in Fig. 3c;

Detailed ways

Embodiments of the present invention will be described in detail below with reference to the drawings and implementation methods.

Embodiment one

FIG. 2 a is a schematic structural diagram of an embodiment of the light emitting device of the present invention. As shown in FIG. 2 a , the light emitting device 200 includes a laser diode array 210 , a light guiding system 230 , and a wavelength conversion device 250 .

The laser diode array 210 includes a first laser diode 211 and a second laser diode 212 that respectively emit a first laser and a second laser. In this embodiment, the first laser diode 211 and the second laser diode 212 are blue laser diodes.

The wavelength conversion device 250 is provided with a wavelength conversion material, specifically yellow phosphor powder, such as YAG phosphor powder, which can absorb blue light and be stimulated to emit yellow light. The wavelength conversion material may also be materials with wavelength conversion capabilities such as quantum dots and fluorescent dyes, and is not limited to phosphors. The wavelength conversion device 251 includes a first surface 251a, the first surface 251a is used to receive the first laser light and the second laser light, and the wavelength conversion material absorbs the first laser light and the second laser light and emits the received light, the received light and the laser light The mixed light is at least partially emitted from the first surface 251a.

The light guiding system 230 is located on the optical path between the laser diode array 210 and the wavelength conversion device 250, and the light guiding system 230 includes a first type component 231 and a second type component 232 surrounding the first type component 231: the first type The assembly 231 includes a first guiding element 231a and a second guiding element 231b. The first guiding element 231a is used to guide the first laser light to be incident on the first surface 251a of the wavelength conversion device, and the second guiding element 231b is used to guide the second laser light to be incident on the first surface 251a of the wavelength conversion device. The first surface 251a of the wavelength conversion device, the second type component 232 is used to guide part of the outgoing light of the first surface 251a of the wavelength conversion device to exit and separate from the laser light path incident to the wavelength conversion device, and the second type component 232 guides The luminous flux of the outgoing light on the first surface is greater than the luminous flux of the outgoing light on the first surface guided by the first type component 231 . Specifically, in this embodiment, the first type of component 231 of the light guiding system 230 is a reflective element group, the first guiding element 231a and the second guiding element 231b are respectively a first reflecting element and a second reflecting element, and the first reflecting element 231a and the second reflective element 231b respectively receive the first laser light and the second laser light and reflect them to the first surface 251a of the wavelength converting device. A second type of component 232 of the light guiding system 231 is an air medium 232 surrounding the first reflective element 231a and the second reflective element 231b, which transmits part of the outgoing light of the first surface of the wavelength conversion device.

In addition, in order to ensure that the luminous flux of the outgoing light of the first surface guided by the second type component 232 is greater than the luminous flux of the first surface guided by the first type component 231, specifically, in this embodiment, it is only necessary to ensure that the reflection element group It is sufficient that the projected area of the direction is less than half of the cross-sectional area of the light beam at the projected surface of the outgoing light of the wavelength conversion device.

In this embodiment, the laser light guided by the reflective element group 231 is incident on the first surface 251a of the wavelength conversion device to generate received light. Since the etendue of the outgoing light of the first surface 251a of the wavelength conversion device is larger than that of the laser diode array 210 The etendue of the laser light is large, so the outgoing light of the first surface 251a of the wavelength conversion device will not only be partially guided by the reflective element group to the direction of the laser diode array 210 and lost, but will also be partially surrounded by the reflective element group 231 The air medium 232 guides the outgoing light as the light emitting device. Further, by controlling the luminous flux of the outgoing light of the first surface guided by the reflective element group 231 to be smaller than the luminous flux of the first surface guided by the air medium 232 around the reflective element group 231, so as to achieve most of the outgoing light of the wavelength conversion device 250 It is separated from the optical path of the laser light incident on the wavelength conversion device 250 .

It is worth noting that, in this embodiment, the laser diode array 210 only includes the first laser diode and the second laser diode, and the first type of components of the light guiding system 230 correspondingly only includes the first guiding element and the second guiding element, In other embodiments of the present invention, the laser diode array 210 may only include other numbers (such as 3, 4 or more than 5) of laser diodes, and at this time, the first type of components of the light guiding system 230 may only include the same number of laser diodes. The guide element can be used, and the effect in this embodiment can also be achieved.

It is easy to understand that the more the number of guiding elements included in the first type of components of the light guiding system, the more light will be lost when the light emitted by the wavelength conversion device is guided to the direction of the laser diode array by the guiding elements. For this problem, an easy-to-think solution is to combine the laser light emitted by the laser diode array first and then enter the light guiding system. At this time, only one guiding element is needed to guide the combined laser light to the wavelength Conversion device. However, the above solutions will inevitably require the introduction of optical elements for light combination and collimation, which will greatly increase the size of the light emitting device, which is not conducive to the miniaturization of its application products. It is also one of the important goals of the present invention to reduce the optical components used and minimize the volume of the light-emitting device. Therefore, in the light-emitting device of the present invention, preferably, the laser diode array only includes N laser diodes, and the light guiding system Correspondingly, the first type of components only includes N guide elements, and N is a natural number greater than or equal to 2, so that the volume of the light-emitting device is small, and it can be used as a light source for micro-devices such as handheld projection equipment.

The first reflective element 231a and the second reflective element 231b in this embodiment can be elements that reflect all light, such as a small reflector, or elements such as a smaller size filter, which can reflect Blue light transmits yellow light, thereby increasing the yellow light component in the outgoing light and improving light utilization efficiency. Preferably, the first laser beam emitted by the first laser diode 211 is completely incident on the surface of the first guiding element 231, and the surface area of the first guiding element 231a is smaller than the spot area of the first laser on the first guiding element 231a 1.5 times. Specifically, in this embodiment, in an ideal state, the surface area of the guiding element is equal to the spot area of the first laser beam on the guiding element, so that the surface area of the guiding element is the smallest, the loss of the received laser light is also the smallest, and the efficiency of the entire system is the highest. . However, considering the possible mismatch between the first laser spot and the shape of the first reflective element 231a in practical applications and the installation errors of the first laser diode 211 and the first reflective element 231a, the area of the guide element needs to be appropriately enlarged to Guarantee a sufficiently high boot efficiency. It has been verified by experiments that when the surface area of the first guiding element 231a is approximately equal to 1.5 times the spot area of the first laser on the first guiding element 231a, the guiding efficiency can be guaranteed to be relatively high, and at the same time, the overall system efficiency will not Excessive losses because the area of the guiding element is too large. Of course, if the shapes are matched and the tolerances are well controlled, less than 1.5 times can get higher system efficiency.

Preferably, in this embodiment, the light emitting device 200 further includes a collimating lens array 220, and the collimating lens array 220 includes a first collimating lens 221 and a second collimating lens 222, and the first collimating lens 221 and the second collimating lens The collimating lens 222 is located between the laser diode array 220 and the light guiding system 230, receives the first laser light and the second laser light respectively, and collimates them to emit to the first guiding element 231a and the second guiding element 231a of the first type component respectively. Element 231b. The divergence angle of the laser light is smaller than that of the phosphor powder, but the laser light still has a certain divergence angle, and the divergence angle is generally between 30 degrees and 40 degrees. The collimating lens array 220 can collimate the outgoing light of the laser diode array 210 and emit it. During the propagation of the outgoing light, the light spot does not expand, and the size of the guiding element can be reduced accordingly to improve efficiency, and the collimated light Facilitate the processing of subsequent optical components.

Preferably, in this implementation, the first collimating lens 221 has a certain focusing function, and is used to receive the first laser light and adjust the first laser light so that the divergence angle is less than or equal to 30 degrees before entering the first light guiding element 231a, so as to reduce the The area of the spot of light incident on the surface of the first light-guiding element. Obviously, at this time, the first light guiding element can use a smaller area, reduce the shielding of the light emitted by the wavelength conversion layer 251, and improve the utilization rate of the emitted light. At the same time, due to the focusing effect of the first collimator lens 221 , the light spot formed on the phosphor powder will become larger after the laser is reflected, and the larger light spot will reduce the power density of the excitation light so as to improve the conversion efficiency of the phosphor powder. However, when the focusing effect of the first collimating lens 221 is too strong, the transmission efficiency of the first laser light will be affected. Therefore, it has been verified by experiments that adjusting the divergence angle of the first laser light to be less than or equal to 30 degrees will not affect the first laser beam. The propagation efficiency of the laser light. It is easy to understand that, for the second collimator lens 222 , the outgoing light of the second laser diode 212 can also be focused, and a similar effect can also be achieved.

In addition, since the structure of the laser diode includes a large-area heat-conducting substrate for heat dissipation, even if the first laser diode 211 and the second laser diode 212 are arranged very close, there will be a gap between the outgoing beams of the light outlets. Therefore, the first reflective element 231a and the second reflective element 231b can also be placed in steps to compress the gap between the first laser and the second laser. As shown in Figure 2b, the first reflective element 231a and the second reflective element 231b respectively receive the first laser light and the second laser light and reflect them. The first reflective element 231a and the second reflective element 231b are placed in parallel. In the light reflection direction of the surface, the distance between the first element 231a and the second element 231b is equal to the distance between the beams of the first laser and the second laser, and the projections of the first element 231a and the second element 231b in this direction have a edge in close contact. Specifically, the emitted light of the laser diode is collimated and emitted as parallel light, the beam width of which is a, and the distance between the first laser and the second laser is b, so the width of the emitted light beam of the collimator lens array is 2a +b, the width of the first reflective element 231a and the second reflective element 231b is a, the first reflective element 231a and the second reflective element 231b form an angle of 45 degrees with the incident light, and the outgoing light of the laser diode array passes through the reflective element The width of the emitted light beam after group reflection becomes 2a, thereby narrowing the gap between the first laser and the second laser. In other embodiments, the included angle between the first reflective element and the second reflective element and the incident light may be other angles, and is limited to 45 degrees.

In this embodiment, the wavelength conversion device 250 includes a wavelength conversion layer 251 , a reflective layer 252 , and a driving device 253 . The wavelength conversion material is disposed on the wavelength conversion layer 251, and the first surface is the surface of the wavelength conversion layer 251 facing the light guiding system. The reflection layer 252 is located on the second surface 251b of the wavelength conversion layer 251, and the second surface 251b is the surface of the wavelength conversion layer 251 opposite to the first surface 251a. The reflective layer 252 is specifically a high-reflective aluminum sheet, which can reflect the light incident on the second surface 251b back to the first surface 251a, improve the utilization efficiency of the laser light and the received light, and support the wavelength conversion layer 251 at the same time. In other implementation manners of the present invention, the reflective layer 252 may also be other devices with a reflective function.

The driving device 253 is used to drive the wavelength conversion layer 251 to move, so that the laser spot formed on the wavelength conversion layer 251 acts on the wavelength conversion layer 251 along a predetermined path, so as to avoid the laser acting on the same position of the wavelength conversion layer 251 for a long time As a result, the temperature of the wavelength conversion layer 251 rises. Specifically, in this embodiment, the driving device 253 is used to drive the wavelength conversion layer 251 to rotate, so that the laser spot formed on the wavelength conversion layer acts on the wavelength conversion layer along a predetermined circular path. Preferably, the reflective layer 252 is in the shape of a disc, the wavelength conversion layer 251 is in an annular shape concentric with the disc, the drive device 253 is a cylindrical motor, and the drive device 253 is coaxial with the reflective layer 252 and the wavelength conversion layer 251 fixed. In other embodiments of the present invention, the driving device may also drive the wavelength conversion layer to move in other ways, such as horizontal reciprocating movement and the like. However, if the wavelength conversion material of the wavelength conversion layer 251 can withstand higher temperatures, the wavelength conversion device 250 may not be provided with a driving device.

Preferably, in this embodiment, the light emitting device 200 further includes an angle adjustment device 240, the light adjustment device 240 is specifically a lens, and the lens collects the outgoing light of the first surface 251a of the wavelength conversion device and reduces the divergence angle of the outgoing light, and The outgoing light is emitted to the light guiding system 230 . In addition, the lens 240 can also receive the light reflected by the reflective element group 231 of the light guiding system 230 and focus it on the first surface of the wavelength conversion device to adjust the size of the incident light spot on the first surface. In other embodiments, the light adjusting device 240 may also be a CPC (Compound Parabolic Concentrator, compound parabolic collector) or an integrating rod and other optical devices capable of reducing the divergence angle of the light beam.

In addition, when the outgoing light of the light-emitting device does not require blue light or needs to modify the outgoing light guided by the second-type component of the light-guiding system, a filter device (not shown in the figure) can be arranged in the second-type component The guided outgoing light exits the light path. The filter device includes a filter, which receives the outgoing light of the second type of component and at least partially transmits the outgoing light. The optical filtering device can be driven by another driving device and synchronized with the wavelength converting device through a synchronizing device. Preferably, the filter device and the wavelength conversion device are coaxially connected on the same straight line, and rotate synchronously under the drive of the driving device. The air medium surrounding the reflective element group is incident on the corresponding area of the filter device.

Embodiment two

Figure 3a is a front view of another embodiment of the light-emitting device of the present invention, as shown in Figure 3a, the light-emitting device 300 includes a laser diode array 310, a wavelength conversion device 320, a shaping device 330, a light guiding system 340, an angle adjustment device 360, wavelength conversion device 350 .

The differences between the light emitting device in this embodiment and the light emitting device shown in FIG. 2 are:

1. As shown in FIG. 3b, in this embodiment, the wavelength conversion layer 351 includes a red light conversion region 351a, a green light conversion region 351b, and a blue light conversion region 351c, and the three conversion regions are respectively provided with red phosphor powder and green phosphor powder and scattering materials. The red light conversion area 351a and the green light conversion area 351b receive the blue laser light and emit the red light and the green light respectively, and the blue light conversion area 351c receives the laser light and emits it after scattering. The wavelength conversion layer 351 is rotated under the drive of the driving device 352, so that the three conversion regions on the wavelength conversion layer 351 receive incident blue laser light in turn. It is worth noting that, since the emitted laser light is not oriented after being scattered, the etendue of the emitted light from the blue light conversion region 351c will be much greater than the etendue of the incident laser light.

2. In this embodiment, the first type of component 341 of the light guide system 340 is a group of light through holes, wherein the first guide element 341a is the first light through hole, the second guide element 341b is the second light through hole, and the first The light through hole 341a and the second light through hole 341b respectively transmit the first laser light and the second laser light to the first surface 351d of the wavelength conversion device, and the second type of component 342 is surrounded by the first light through hole 341a and the second light through hole A reflective element around 341b, the reflective element 342 reflects part of the outgoing light of the first surface 351d of the wavelength conversion device and separates it from the laser light path.

Similarly, guided by the aperture group 341, the laser light is incident on the first surface of the wavelength conversion device 350 to generate the received light. Since the etendue of the outgoing light of the first surface of the wavelength conversion device 350 is larger than that of the laser diode array 310 The etendue of the laser light is large, so the outgoing light of the first surface of the wavelength conversion device 350 will not only be guided by the light hole group 341 to exit to the direction of the laser diode array and be lost, but also be guided by the reflective element 342 to exit as a light emitting device Further, by controlling the luminous flux of the first surface of the first surface guided by the reflective element 342 to be greater than the luminous flux of the first surface guided by the light through hole 341, thereby realizing most of the emitted light of the wavelength conversion device 350 and the incident wavelength The optical path of the laser light of the switching device 350 is divided.

Preferably, the light guiding system further includes a filter covering the first light through hole, the filter can transmit the blue laser light and reflect the received light, that is, the yellow light, so by setting the filter, the output of the wavelength conversion device 350 The receiving light in the emitting light will not be lost through the light hole group, which improves the utilization rate of the receiving light. It is easy to understand that yes, the same optical filter is also set at the second aperture to improve the utilization rate of the received light.

In this embodiment, the shape of the reflective element 342 of the light guiding system 340 is planar, and the planar reflective element has the advantages of simple structure and small occupied space, which is beneficial to miniaturization of the light emitting device. In order to make the luminous flux of the outgoing light of the first surface guided by the reflective element 342 greater than the luminous flux of the first surface guided by the light-through hole group 341, the area of the light-through hole group 341 should be smaller than the area of the wavelength conversion device's outgoing light incident on the reflective element 342 . In addition, the shape of the reflective element 342 of the light guide system 340 can also be a free-form surface, and the free-form reflective element can reflect the light to the reflective element to a point, which is beneficial to light collection and improves light utilization efficiency. For a free-form surface, the divergence angle of the light emitted by the wavelength conversion device corresponding to the clear hole group is smaller than the divergence angle of the light emitted by the wavelength conversion device corresponding to the reflective element, so that the light emitted from the first surface guided by the reflective element 342 can be ensured. The luminous flux is greater than the luminous flux of the first surface guided by the light hole group 341 . In other embodiments of the present invention, the shape of the reflection element of the light guiding system can also be an ellipsoid or a part of an ellipsoid, and the incident light spot of the wavelength conversion layer is located at a focal point of the ellipsoid, so that most of the light emitted from the wavelength conversion layer Reflected to another focal point of the ellipsoid through the reflective surface of the ellipsoid reflector; or, the light guiding device is a hemisphere or a part of the hemisphere, and the wavelength conversion layer is arranged at a point close to the center of the sphere, so that the wavelength conversion Most of the light emitted from the wavelength conversion layer is reflected by the reflective surface of the spherical reflector to another point symmetrical to the center of the sphere, and the light is collected at this point, which can guide the light emitted by the wavelength conversion layer and separate the optical path of the laser. .

3. In this embodiment, the light emitting device 300 further includes a shaping device 330, which is specifically a scattering sheet. The scattering sheet is located on the optical path between the collimating lens array 320 and the light guiding system 340, and receives the first collimating lens. 321 and the second collimating lens 322 to reshape the outgoing light and then exit. Through shaping, the spot shapes of the first laser light and the second laser light can be adjusted accordingly, and at the same time adjusted to a uniform spot, for example, when the first laser light and the second laser light are incident on the same position of the wavelength conversion layer 351, that is, the distance between the two The spot coincides, and the spot of the first laser and the second laser can be adjusted to the same shape as the projection plane through the scattering sheet; The light spot of the second laser can be adjusted by the scattering sheet, and the combined light spot of the first laser and the second laser has the same shape as the projection area. In addition, since the diffuser 330 receives collimated light, the divergence of the shaped light beam will not be greatly enhanced. In other embodiments of the present invention, the shaping device may also be a device having a shaping effect such as a curved lens array.

Since blue light exists in both the red light conversion region and the green light conversion region of the wavelength conversion device, resulting in poor color of the emitted light, therefore, preferably, as shown in Figure 3c, the light emitting device may further include a filter device 370, which The filter device 370 is provided with a filter, and the filter device 370 receives the outgoing light of the second type of component and at least partially transmits the outgoing light. As shown in FIGS. 3c and 3d , the filter device 370 is disposed on the outer circle of the wavelength conversion layer 351 , is coaxially connected with the wavelength conversion layer 351 and rotates synchronously under the drive of the driving device 352 . The filter device 370 includes a red light filter area 370a, a green light filter area 370b, and a blue light filter area 370c. region 351c, and the angles of the filter device 370 and the corresponding regions of the wavelength conversion layer 351 are the same. The three regions are respectively provided with a red light filter, a green light filter and a transparent section. For example, the second type component 342 of the light guiding system receives part of the outgoing light from the red light conversion region 351a of the wavelength conversion layer, and guides the outgoing light to be reflected by the reflector 380 to the red light filter region of the filter device for filtering. . Here, the outgoing light of the second type component 342 of the light guiding system is reflected to the filter device 370 through the reflector 380. The outgoing light is guided to the filter device, and the first type of component 342 in this embodiment is not limited to a planar reflective element, and may be in other shapes.

In addition, it is easily conceivable for the light in FIG. 3d that the outgoing light of the reflective element 342 is also guided to other positions of the filter device to be incident. For example, the reflective element 342 and the mirror 380 guide part of the outgoing light of the wavelength conversion device to the exit filter device 370 to form a light spot on the surface, and the connection line between the position of the light spot and the light spot on the wavelength conversion layer passes through the connection between the filter device and the wavelength conversion layer. center of rotation, and the two are distributed on both sides of the center of rotation. At this time, the distribution of each area of the filter device and the wavelength conversion device is shown in Figure 3e. The red light conversion area 351a and the red light filter area 370a are about They are placed symmetrically, and the angular distribution of the two is the same, and other regions are also arranged correspondingly. This structure can make full use of the space of the light emitting device, which is a preferred way.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

An embodiment of the present invention also provides a projection system, including a light emitting device, and the light emitting device may have the structures and functions in the above-mentioned embodiments. The projection system can adopt various projection technologies, such as liquid crystal display (LCD, Liquid Crystal Display) projection technology, digital light path processor (DLP, Digital Light Processor) projection technology.

The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (11)

1. A lighting device, characterized in that, comprising: A laser diode array, the laser diode array includes a first laser diode and a second laser diode, respectively emitting the first laser and the second laser; A wavelength conversion device provided with a wavelength conversion material, the wavelength conversion device includes a first surface for receiving the first laser light and the second laser light, and the wavelength conversion material absorbs the first laser light and the second laser light to generate the subject light, the mixed light of the subject light and the unabsorbed laser light is at least partially emitted from the first surface; A light guiding system located on the optical path between the laser diode array and the wavelength conversion device, the light guiding system includes a first type of component and a second type of component surrounding the first type of component: The first type of component includes a first guiding element and a second guiding element, the first guiding element is used to guide the first laser light to be incident on the first surface of the wavelength conversion device, and the second guiding element uses guiding the second laser light to be incident on the first surface of the wavelength conversion device; The second type of component is used to guide part of the outgoing light of the first surface of the wavelength conversion device to exit and separate from the laser light path incident to the wavelength conversion device, and the outgoing light of the first surface guided by the second type of component The luminous flux is greater than the luminous flux of the outgoing light on the first surface guided by the first type of component. 2. The light emitting device according to claim 1, wherein the first laser beam is completely incident on the surface of the first guiding element, and the surface area of the first guiding element is smaller than that of the first laser beam on the surface of the first guiding element. 1.5 times the spot area on the first guiding element. 3. The light emitting device according to claim 1, wherein the first type of component of the light guiding system is a reflective element group, and the first guiding element and the second guiding element are respectively a first reflecting element and a second guiding element. Two reflective elements, the first reflective element and the second reflective element respectively receive the first laser light and the second laser light and reflect them to the first surface of the wavelength conversion device, and the second type of light guiding system The component is an air medium surrounding the first reflective element and the second reflective element, and the air medium transmits part of the light emitted from the first surface of the wavelength conversion device. 4. The light-emitting device according to claim 3, characterized in that: the first reflective element is placed parallel to the second reflective element, and in the reflection direction of light incident on the surface of the reflective element group, the first reflective element The distance from the second element is equal to the distance between the beams of the first laser and the second laser, and the projections of the first element and the second element in this direction are in close contact with one side. 5. The light emitting device according to claim 1, wherein the first type of components of the light guide system is a group of light through holes, wherein the first guide element is the first light through hole, and the second guide element is the second light through hole group. Two optical holes, the first optical hole and the second optical hole respectively transmit the first laser light and the second laser light to the first surface of the wavelength conversion device, and the second type of components is surrounded by the first optical hole A light through hole and a reflective element around the second light through hole, the reflective element reflects part of the outgoing light from the first surface and is separated from the laser light path. 6. The light emitting device according to claim 5, wherein the light guiding system further comprises a filter covering the first light through hole, the filter transmits the first laser light and reflects the received light. 7. The light emitting device according to claim 5, wherein the reflective element is a plane. 8. The light emitting device according to claim 1, characterized in that: the light emitting device further comprises a collimating lens array, the collimating lens array includes a first collimating lens and a second collimating lens, the first collimating lens The lens and the second collimating lens are located between the laser diode array and the light guiding system, and are respectively used to receive the first laser light and the second laser light and collimate them to emit to the first type of components respectively The first guide element and the second guide element. 9. The light emitting device according to claim 8, wherein the first collimating lens has a focusing function, and is used to adjust the divergence angle of the first laser light to be less than or equal to 30 degrees before emitting it. 10. The light-emitting device according to claim 1, wherein the wavelength converting device further comprises a driving device and a filter device, and the filter device receives the emitted light of the second type component and at least partially transmits it For the emitted light, the filter device is coaxially connected with the wavelength conversion device and rotates synchronously under the drive of the drive device. 11. A projection system, characterized by comprising the light emitting device according to any one of claims 1 to 10.