CN109991801B

CN109991801B - Color wheel assembly, light source device and projection system

Info

Publication number: CN109991801B
Application number: CN201810005267.8A
Authority: CN
Inventors: 杜鹏; 郭祖强; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2018-01-03
Filing date: 2018-01-03
Publication date: 2022-08-05
Anticipated expiration: 2038-01-03
Also published as: CN109991801A; WO2019134260A1

Abstract

The invention provides a color wheel assembly, which comprises a first bearing piece; the wavelength conversion element is fixed around the peripheral wall of the first bearing piece and used for receiving exciting light of a light source and generating excited light; the second bearing piece is fixedly connected with one end of the first bearing piece; and the filtering element is fixed on the second bearing piece and used for receiving and filtering the received laser. The invention also comprises a light source device and a projection system of the color wheel assembly. The color wheel assembly is simple in rotation control and small in size.

Description

Color wheel assembly, light source device and projection system

Technical Field

The present invention relates to the field of optical technologies, and in particular, to a color wheel assembly, a light source device, and a projection system.

Background

At present, a spatial light modulator is widely applied in the field of projection display, the spatial light modulator generally comprises an LCD, an LCOS, a DMD and the like, a single-chip spatial light modulator projection system realizes color projection display based on time sequence switched primary color light, and the single-chip spatial light modulator projection system is widely applied in middle and low end markets due to the characteristics of simple structure, low cost and the like. Because the spectral bandwidth of the excited light of the laser excited fluorescent powder is wide, a filter is usually added in the light source to intercept the required wavelength band, such as green light or red light from yellow fluorescent light.

In practical light sources, a dual color wheel or a single color wheel structure is generally adopted to filter the light spectrum of the fluorescent powder. The double-color wheel structure refers to a double-color wheel system of a fluorescent wheel and a filter wheel, but the fluorescent wheel and the filter wheel need to be synchronously controlled, so that the complexity of a light source is increased. The color wheel in the monochromatic wheel structure comprises an inner ring serving as a fluorescent area and an outer ring serving as a filter area, the synchronous problem of the fluorescent area and the filter area does not need to be considered in the structure, however, the width of the fluorescent area and the width of the filter area are overlapped in the radius direction of the color wheel, the outer diameter of the color wheel is large, and the light source is difficult to achieve miniaturization.

Disclosure of Invention

In view of the above, it is desirable to provide a light source device and a projection system of a miniaturized color wheel assembly.

The invention provides a color wheel assembly, which comprises a first bearing piece; the wavelength conversion element is fixed around the peripheral wall of the first bearing piece and used for receiving exciting light of a light source and generating excited light; the second bearing piece is fixedly connected with one end of the first bearing piece; and the filtering element is fixed on the second bearing piece and used for receiving and filtering the received laser.

The invention also provides a light source device, comprising an excitation light source for generating excitation light and a color wheel assembly, wherein the color wheel assembly comprises: a first bearing member; the wavelength conversion element is fixed around the peripheral wall of the first bearing piece, is arranged in the transmission path of the exciting light, and outputs the exciting light and the exciting light in a time sequence under the irradiation of the exciting light source; the second bearing piece is fixedly connected with one end of the first bearing piece; and the filtering element is fixed on the second bearing piece and used for receiving and filtering the received laser.

The invention also provides a projection system comprising the light source device.

According to the color wheel assembly provided by the invention, the filtering element is arranged on the end face of the bearing piece, and the wavelength conversion element is arranged on the peripheral wall of the bearing piece in a surrounding manner, so that the radial size of the color wheel assembly is greatly reduced, the miniaturization is realized, and when the color wheel assembly is controlled to rotate, the filtering element and the wavelength conversion element are driven along with the driving of the first bearing piece, the synchronous control problem of the filtering wheel and the fluorescent wheel is not required to be considered, and the driving control of the color wheel assembly is simpler.

Drawings

Fig. 1 is a schematic structural diagram of a light source device according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram of the structure of the color wheel assembly shown in fig. 1.

Fig. 3 is a schematic top view of the color wheel assembly of fig. 2.

Fig. 4 is a schematic structural diagram of a light source device according to a second embodiment of the present invention.

Fig. 5 is a schematic diagram of the structure of the color wheel assembly shown in fig. 4.

Fig. 6 is a schematic structural diagram of a light source device according to a third embodiment of the present invention.

Fig. 7 is a schematic diagram of the excitation light source, the turn-off timing of the compensation light source, and the distribution of the segment areas of the wavelength conversion element according to the embodiment of the invention.

Fig. 8 is a schematic structural diagram of a light source device according to a fourth embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a light source device according to a fifth embodiment of the present invention.

Fig. 10 is a schematic top view of the second reflective element of fig. 9.

Fig. 11 is a schematic structural diagram of a light source device according to a sixth embodiment of the present invention.

Fig. 12 is a schematic structural diagram of a light source device according to a seventh embodiment of the present invention.

Fig. 13 is a schematic structural diagram of a light source device according to an eighth embodiment of the present invention.

Fig. 14 is a schematic view of the color wheel assembly of fig. 13.

Fig. 15 is a schematic structural diagram of a light source device according to a ninth embodiment of the present invention.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention and the scope of the present invention is therefore not limited to the specific embodiments disclosed below. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a light source device 100 according to a first embodiment of the invention. The light source device 100 is applied to a projection device. The light source device 100 includes an excitation light source 120, an adjusting device, a color wheel assembly 160, and a first light homogenizing device 180. The excitation light source 120 is configured to generate excitation light of at least one color. The color wheel assembly 160 is configured to perform wavelength conversion on the excitation light and emit the excitation light and the excitation light in a time sequence. The adjusting device is configured to guide the stimulated light and the excitation light incident along the overlapped light path, adjust the stimulated light to a first divergence angle, and emit the stimulated light from the color wheel assembly 160, and emit the excitation light from the color wheel assembly 160 at a second divergence angle matching the first divergence angle. The overlapped light path means that the transmission light path of the excited light and the transmission light path of the exciting light are at least partially overlapped. The first light unifying means 180 unifies the excitation light and the excitation light emitted at divergence angles matched with each other.

Specifically, the excitation light source 120 includes a light emitter 121 for generating the excitation light and a second light uniformizing device 122 for uniformizing the excitation light.

Further, the excitation light source 120 may be a blue light source, and emit blue excitation light. It is understood that the excitation light source 120 is not limited to a blue light source, and the excitation light source 120 may be a violet light source, a red light source, a green light source, or the like. In this embodiment, the light emitter 121 is a blue laser and emits blue laser light as the excitation light. It is understood that the light emitter 121 may include one, two or more blue lasers, and the number of the lasers may be selected according to actual needs.

The second light uniformizing device 122 is located on an emergent light path of the light emitter 121, and is configured to uniformize the excitation light. In this embodiment, the second light unifying device 122 is a light unifying rod, and it should be understood that in other embodiments, the second light unifying device 122 may include a fly-eye lens, a light unifying rod, a diffuser or a scattering wheel, and the like, which is not limited thereto.

Referring to fig. 1 and fig. 2, fig. 2 is a schematic structural diagram of the color wheel assembly 160 shown in fig. 1. The color wheel assembly 160 includes a first carrier 161, a wavelength conversion element 165, a second carrier 163, and a filter element 167. The wavelength conversion element 165 is configured to receive the excitation light emitted from the excitation light source 120 and generate excited light, and is fixed around the peripheral wall of the first carrier 161 to form a drum-type wavelength conversion structure. The second bearing 163 is fixedly connected to the first bearing 161. The filter element 167 is fixed on an end surface of the second carrier 163 far from the first carrier 161 and extends around the circumference of the second carrier 163, for receiving and filtering the laser beam. In this embodiment, the first carrier 161 is substantially columnar, the second carrier 163 is substantially plate-shaped, and the width of the second carrier 163 is greater than the width of the first carrier 161. The second bearing member 163 is fixedly connected to the first bearing member 161 by a connecting member. The central axis of the first bearing 161 coincides with the central axis of the second bearing 163, and serves as the central axis of the color wheel assembly 160. It is understood that the second bearing element 163 may be directly fixed to the first bearing element 161, or the first bearing element 161 and the second bearing element 163 may be integrally formed or may be separately formed and connected.

The wavelength conversion element 165 is disposed in a transmission path of the excitation light, and outputs the excitation light and the excitation light in a time series under irradiation of the excitation light source 120. In particular, the wavelength converting element 165 includes a circumferentially disposed conversion region 164 and a non-conversion region 166. The conversion regions 164 and the non-conversion regions 166 are alternately located on the optical path of the excitation light under the driving of the driving device, so that the color wheel assembly 160 sequentially emits the excited light subjected to wavelength conversion and the excitation light not subjected to wavelength conversion. The conversion area 164 and the non-conversion area 166 are respectively distributed in a square curved surface, and the outer surfaces of the conversion area 164 and the non-conversion area 166 are parallel to the central axis of the color wheel assembly 160. In this embodiment, the wavelength conversion element 165 is a reflective wavelength conversion element. By reflective wavelength converting element is meant that the outgoing light of the wavelength converting element 165 travels in the opposite direction to the incoming light.

Specifically, the conversion region 164 is provided with a wavelength conversion material to generate stimulated light in the form of lambertian light of at least one color under excitation by the excitation light. As shown in fig. 2, the transition region 164 is divided into a red region (R), a green region (G), and a yellow region (Y). The red area is provided with red fluorescent powder so as to generate red stimulated light under the excitation of the exciting light; the green area is provided with green fluorescent powder to generate green stimulated light under the excitation of the exciting light; and the yellow region is provided with yellow fluorescent powder so as to generate yellow stimulated light under the excitation of the exciting light. It is understood that the conversion region 164 may be provided with phosphors of other colors than red, green and yellow to generate stimulated light of other colors. The non-conversion region 166 is provided with a mirror or a small angle scattering plate, such as a gaussian reflector, for reflecting the excitation light. In this embodiment, the non-conversion region 166 is set as a blue region (B-mirror) for reflecting the blue excitation light. The red stimulated light, the green stimulated light, the yellow stimulated light and the blue excitation light form white light after being homogenized in the first light homogenizing device 180.

The filter element 167 is substantially in the shape of a ring plate, and includes a hollow region 162, a filter region 168 disposed around the hollow region 162, and a non-filter region 169. The filter area 168 and the non-filter area 169 are disposed in a fan-shaped ring respectively. It is understood that, in other embodiments, the filter element 167 may also be designed as a disk, in which case the filter area 168 and the non-filter area 169 are respectively disposed in a sector shape. The filter area 168 corresponds to the converting area 164 and is used for filtering the excited light to improve the color purity of the primary color of the light source. The non-filter region 169 corresponds to the non-conversion region 166, and is configured to scatter the excitation light, expand the divergence angle of the excitation light, and make the excitation light emitted from the non-filter region 169 in lambert light distribution.

In particular, the filter regions 168 are provided with a filter material to filter the stimulated light in the form of lambertian light having at least one color. As shown in fig. 2, the filter area 168 is divided into a red area (R), a green area (G) and a yellow area (Y), and the red area, the green area and the yellow area of the filter area 168 correspond to the red area, the green area and the yellow area of the conversion area 164 one by one. A red filter is arranged in the red area to filter red laser light; a green filter is arranged in the green area to filter the green laser light; and a yellow filter is arranged in the yellow area to filter yellow laser light. It is understood that the conversion region 164 may be provided with filters of other colors than red, green and yellow to filter the excited light of other colors. The non-filter region 169 is provided with a transmission type scattering sheet or a single compound eye for enlarging the divergence angle of the excitation light emitted from the non-conversion region 166. In this embodiment, the non-filter area 169 is a blue area (B-buffer) for expanding the divergence angle of the blue excitation light.

In this embodiment, the first bearing 161 and the second bearing 163 are driven by the same driving device, for example, the driving device may be partially accommodated in the hollow region 162 and connected to the bearings. When the carrier rotates, the primary light beams of the colors emitted from the conversion region 164 and the excitation light beams emitted from the non-conversion region 166 are sequentially incident on the filter region 168 and the non-filter region 169 of the corresponding color on the filter element 167, so that the primary light beams are sequentially combined into white light.

Referring to fig. 3, fig. 3 is a schematic top view of the color wheel assembly 160 shown in fig. 2. The angle of each segment region (e.g., G filter region) in the filter element 167 corresponding to the axis of the color wheel assembly 160 is equal to and coincides with the angle of each segment region (e.g., G conversion region) in the wavelength conversion element 165 corresponding to the axis of the color wheel assembly 160, so that the stimulated light or the excitation light emitted from each segment region in the wavelength conversion element 165 can enter the corresponding region in the filter element 167 when the color wheel assembly 160 rotates.

The adjusting device includes a collecting lens 141, a light splitting and combining element 142, a first relay lens 143, and a first reflecting element 144. The collecting lens 141 is configured to converge the excitation light emitted from the excitation light source 120 on the surface of the wavelength conversion element 165, and collimate the exit light of the wavelength conversion element 165. The light splitting and combining element 142 is used for transmitting the excitation light and reflecting the stimulated light. The first reflecting element 144 is used for reflecting the excitation light emitted from the wavelength conversion element 165. The first relay lens 143 condenses and emits the excitation light and the received laser light emitted from the wavelength conversion element 165.

The main optical axis of the excitation light source 120 is parallel to but not coincident with the main optical axis of the collecting lens 141, so as to distinguish the incident light path and the exit light path of the excitation light on the non-conversion region 166. The excitation light emitted from the excitation light source 120 is converged by the collecting lens 141, then obliquely enters at a predetermined angle and converges on the surface of the wavelength conversion element 165, and is reflected by the non-conversion region 166 and then exits. Wherein, the incident light path of the excitation light incident to the non-conversion region 166 is not overlapped with the emergent light path of the excitation light reflected by the non-conversion region 166, and is symmetrically arranged along the main optical axis of the collecting lens 141.

The light splitting and combining element 142 may adopt an optical structure with a split wavelength, that is, light combining is performed according to different wavelength ranges of incident light. As an embodiment of wavelength splitting, the light splitting and combining element 142 is used for transmitting the excitation light and reflecting the stimulated light. Specifically, the light splitting and combining element 142 includes a first surface and a second surface that are disposed opposite to each other, and the excitation light emitted from the excitation light source 120 enters the light splitting and combining element 142 from the first surface and emits to the collecting lens 141 through the second surface. The excitation light and the stimulated light emitted from the wavelength conversion element 165 are collimated by the collecting lens 141 and then enter the second surface of the light splitting and combining element 142, wherein the excited light is reflected by the second surface of the light splitting and combining element 142, and the excitation light sequentially penetrates through the second surface and the first surface of the light splitting and combining element 142 and is emitted to the first reflecting element 144. In this embodiment, the light splitting and combining element 142 includes a blue-transmissive and yellow-reflective dichroic film layer.

The first reflecting element 144 is configured to reflect the excitation light emitted from the first surface of the light splitting and combining element 142. The excitation light reflected by the first reflecting element 144 sequentially passes through the first surface and the second surface of the light splitting and combining element 142 to be emitted. The excited light emitted from the wavelength conversion element 165 and the excitation light are combined into one path on the second surface of the light splitting and combining element 142. At this time, the etendue of the excitation light is smaller than that of the stimulated light, and the angular distributions of the stimulated light and the excitation light do not match. In this embodiment, the first reflective element 144 is a plane mirror. It is understood that the first reflective element 144 may also be a convex mirror.

The stimulated light and the excitation light emitted from the light splitting and combining element 142 are converged by the first relay lens 143 and then enter the filter element 167, and the excitation light and the stimulated light emitted from the filter element 167 are coupled into the first dodging device 180 at mutually matched divergence angles. Specifically, when the excitation light passes through the non-filter region 169, the excitation light is scattered, so that the divergence angle of the excitation light is enlarged, the excitation light is incident to the first light uniformizing device 180 at a second divergence angle matched with the first divergence angle of the stimulated light, that is, the excitation light and the stimulated light have mutually matched angular distributions at the inlet surface of the first light uniformizing device 180, and the excitation light and the stimulated light are reflected for multiple times inside the first light uniformizing device 180, so that the excitation light and the stimulated light emitted by the first light uniformizing device 180 are mixed more uniformly, and the uniformity of the light source is improved.

In the color wheel assembly 160 of the present embodiment, the filter element 167 is disposed at one end of the second carrier 163, such that the width of the filter element 167 extends along the radial direction of the color wheel assembly 160, and the wavelength conversion element 165 is disposed on the peripheral wall of the first carrier 161 in a surrounding manner, such that the width of the wavelength conversion element 165 extends along the axial direction of the color wheel assembly 160, such that the overall width of the color wheel assembly 160 is only contributed by the width of the filter element 167, such that the radial dimension of the color wheel assembly 160 is greatly reduced, and miniaturization is achieved. Moreover, the filter element 167 is disposed at one end of the second carrier 163, and by adjusting the width of the second carrier 163, the excitation light and the received laser light combined by the light splitting and combining element 142 can be emitted to the filter element 167 only after being converged by the first relay lens 143, so that the number of optical elements is reduced, and the structure is simplified. In addition, when the color wheel assembly 160 is controlled to rotate, the filter element 167 and the wavelength conversion element 165 are driven along with the driving of the bearing member, so that the problem of synchronous control of the filter wheel and the fluorescent wheel is not needed to be considered, and the driving control of the color wheel assembly 160 is simpler. In addition, after the laser is filtered by the filter area 168, the color purity of the primary color of the light source is improved; the excitation light is lossless in the light source device 100, its angular distribution is continuous, and after being scattered by the non-filter area 169, its angular distribution matches with that of the stimulated light, so that better uniformity is achieved.

Referring to fig. 4 and fig. 5, fig. 4 is a schematic structural diagram of a light source device 200 according to a second embodiment of the present invention, and fig. 5 is a schematic structural diagram of a color wheel assembly 260 shown in fig. 4. The light source device 300 of the present embodiment is different from the light source device of the first embodiment in the positional relationship between the collecting lens and the excitation light source and the structure of the conversion region of the wavelength conversion element.

Specifically, the excitation light source 220 is coaxially disposed with the collecting lens 241; the outer surface of the non-conversion region 266 is disposed obliquely with respect to the central axis of the color wheel assembly 260. Excitation light emitted by the excitation light source 220 is incident on the non-conversion region 266 along the main optical axis of the collection lens 241, and is reflected back to the collection lens 241 in a tilted manner at a preset angle, so that the incident light path and the emergent light path of the excitation light on the non-conversion region 266 are not overlapped. The incident light path and the emergent light path are symmetrically arranged along the normal of the inclined plane of the non-conversion region 264.

In addition to the effects of the first embodiment, the light source device 200 of the present embodiment has an excitation light source 220 and a collecting lens 241 coaxially disposed, so that the excitation light is incident on the outer surface of the wavelength conversion element 265 along the main optical axis of the collecting lens 241. According to the aberration principle, the imaging aberration of the on-axis ray (zero field of view) is smaller than that of the off-axis ray (larger field of view). Therefore, the excitation light is incident along the main optical axis of the collecting lens 241, and a light spot with good imaging quality and uniform illumination intensity can be formed on the outer surface of the wavelength conversion element 265, so as to improve the excitation efficiency of the wavelength conversion material (e.g., phosphor) on the conversion region 264.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a light source device 300 according to a third embodiment of the present invention. The light source device 300 of the present embodiment is different from the light source device of the second embodiment in that a compensation light source 330 for emitting compensation light having a spectral range different from that of the excitation light and a light combining element 345 for guiding the compensation light are added.

In this embodiment, the compensating light source 330 may be a red or green light source, and emits red or green compensating light. It is understood that the compensating light source 330 is not limited to a red or green light source, but may be a violet light source, etc. Specifically, the compensating light source 330 includes a light emitter 331, a scattering element 332, a first lens 333, and a second lens 334. The light emitter 331 is configured to emit red or green compensating light, wherein the red compensating light and the green compensating light can be combined by the dichroic plate in parallel. It will be appreciated that the light 331 may include one, two or more red or green lasers. The compensating light is converged on the surface of the scattering element 332 by the first lens 333 and then dispersed, and the divergent compensating light is converged on the light combining element 345 by the second lens 334.

The scattering element 332 serves to homogenize, decoherence, and expand the divergence angle of the compensation light. The scattering element 332 includes a scattering wheel 335 and a second drive member 336. The second driving member 336 is connected to the scattering wheel 335 for driving the scattering wheel 335 to rotate around a predetermined rotation axis. The scattering wheel 335 rotates under the driving of the second driving member 336, which can eliminate the speckle phenomenon of the compensating light.

The light combining element 345 includes a transmissive region and a reflective region. The transmission region is used for transmitting the excitation light and the stimulated light emitted by the filter element 367, and the reflection region is used for reflecting the compensation light. In this embodiment, the transmission region is provided with a full-band antireflection film, and the reflection region is provided with a red light or green light reflection film. The compensation light converges on the reflection region, and after passing through the reflection region, the compensation light is combined with the stimulated light and the excitation light and then coupled into the first dodging device 380. Because the compensating light is converged in the reflecting area, the light spot of the compensating light irradiated on the reflecting area is smaller, so that the area of the reflecting area can be reduced, and the loss of the received laser light can be reduced. The loss of the angular distribution of the stimulated light in the reflection area is compensated by the compensation light, so that the angular distribution of the stimulated light is still continuous, and the stimulated light and the exciting light can still be uniformly mixed in the first dodging device.

Referring to fig. 7, fig. 7 is a schematic diagram of an excitation light source, a turn-off timing of a compensation light source, and a distribution of segment regions of a wavelength conversion device according to an embodiment of the invention. The conversion region of the wavelength conversion element is provided with a first wavelength conversion layer, and the first wavelength conversion layer emits first stimulated light under the irradiation of the exciting light. Wherein the first wavelength conversion layer is a wavelength conversion layer capable of converting excitation light into excited light having a spectrum overlapping with the compensation light. It is understood that the first wavelength conversion layer may be a segment region of a red region (R), a green region (G) and/or a yellow region (Y), and the first stimulated light may be red stimulated light, green stimulated light and/or yellow stimulated light.

When the light source is driven, the excitation light source is always in an on state, the compensation light source is turned on when a segment area provided with a first wavelength conversion layer in the conversion area is positioned in a transmission path of the excitation light source, and is turned off in other segment areas and non-conversion areas in the conversion area. Specifically, the excitation light source emits blue excitation light, and if the compensation light source is a red laser light source, when the excitation light source irradiates a red area (R) or a yellow area (Y) of the conversion area, the compensation light source is turned on; when the excitation light source irradiates a green area (G) or a non-conversion area (B-mirror) of the conversion area, the compensation light source is turned off. If the compensation light source is a green laser light source, when the excitation light source irradiates a green area (G) or a yellow area (Y) of the conversion area, the compensation light source is turned on; when the excitation light source irradiates a red area (R) or a non-conversion area (B-mirror) of the conversion area, the compensation light source is turned off.

The light source device 300 of the present embodiment has the efficacy of the light source device 200 of the second embodiment, and improves the brightness of the light source and the color purity of the primary color (red light or green light) by adding the compensation light source 330.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a light source device 400 according to a fourth embodiment of the invention. The light source device 400 of the present embodiment is different from the light source device of the third embodiment in the arrangement position of the compensation light source 430, the structure and position of the light combining element 444 for guiding the compensation light, and the structure of the light splitting and combining element 442.

Specifically, the compensating light source 430 is disposed adjacent to the light splitting and combining element 442, and the light combining element 444 replaces the first reflective element and is disposed at a position of the first reflective element. The compensation light emitted by the compensation light source 430 is converged on the light splitting and combining element 442 after passing through the light combining element 444, and is combined with the excitation light and the received laser light into a path on the second surface of the light splitting and combining element 442. The light combining element 444 is used for transmitting the compensation light and reflecting the excitation light. In this embodiment, the light combining element 444 includes a blue-reflective, yellow-transmissive dichroic film layer. The light splitting and combining element 442 includes a transmission region for transmitting the compensation light and a light combining region for reflecting the stimulated light and transmitting the excitation light. The transmission area is provided with a full-wave-band antireflection film, and the light combination area is provided with a blue-transmitting and yellow-reflecting dichroic film.

The light source device 400 of the present embodiment has the efficacy of the light source device in the third embodiment, and the compensation light source 430 is disposed adjacent to the light splitting and combining element 442, so that the compensation light is combined with the received laser light at the light splitting and combining element 442, thereby omitting the light combining element for separately combining the compensation light and the fluorescent light, and reducing the number of optical elements.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a light source device 500 according to a fifth embodiment of the invention. The light source device 500 of the present embodiment is different from the light source device of the first embodiment mainly in the difference of the filter structure, and an optical element for guiding light to be incident to and emitted from the filter structure is added.

The second bearing member 563 has a substantially hollow cylindrical shape. The filter element 567 is fixed around the peripheral wall of the second carrier 563 to form a drum-type filter structure. The filtering element 567 includes filter regions and non-filter regions distributed along the circumferential direction. The filter area and the non-filter area are respectively distributed in a square curved surface. The adjustment device further comprises a third reflective element 545 and a second reflective element 546. In this embodiment, the third reflective element 545 and the second reflective element 546 are all full-band reflective elements. The third reflecting element 545 is configured to reflect the excitation light and the received laser light emitted from the light splitting and combining element 542 to the first relay lens 543, so that the excitation light and the received laser light converged by the first relay lens 543 can be incident on the filter element 567 in the shape of a circular column. The second reflecting element 546 is accommodated in the second supporting member 563 and is configured to correct a divergence angle between the excitation light and the stimulated light emitted from the filter element 567. The second reflecting element 546 is a cylindrical mirror, and an incident surface of the second reflecting element 546 is a concave surface, and is configured to correct the excitation light and the received laser light that are diffused after passing through the filter element 567, so that the excitation light and the received laser light have divergence angles that match each other. Specifically, the incident surface of the second reflecting element 546 is concave in the Y direction of fig. 10.

In addition to the effects of the first embodiment, the light source device 500 of the present embodiment further includes a drum-type filtering structure, such that the width of the filtering element 567 also extends along the axial direction of the color wheel assembly, rather than along the radial direction of the color wheel assembly, so as to further reduce the radial dimension of the color wheel assembly, and further miniaturize the color wheel assembly and the light source device 500.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a light source device 600 according to a sixth embodiment of the present invention. The light source device 600 of the present embodiment is different from the light source device of the fifth embodiment in that a compensation light source 630 for emitting compensation light having a different spectral range from that of the excitation light and a light combining element 645 for guiding the compensation light are added, and the third reflection element is omitted.

The structure of the compensation light source 630 is the same as that of the compensation light source in the third embodiment, and details are not repeated here.

The light combining element 645 is disposed at a position of the third reflective element instead of the third reflective element. The compensation light emitted from the compensation light source 630 is transmitted through the light combining element 645 and enters the first relay lens 643. The light combining element 645 includes a transmission region for transmitting the compensation light and a reflection region for reflecting the excitation light and the stimulated light. Wherein the compensating light is condensed to the transmissive region. In this embodiment, the transmission region is provided with a red light or green light antireflection film, and the reflection region is provided with a full-wave-band reflection film.

The light source device 600 of the present embodiment has the effects of the fifth embodiment, and further improves the brightness of the light source and the color purity of the primary color (red or green) by adding the compensation light source 630.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a light source device 700 according to a seventh embodiment of the disclosure. The light source device 700 of the present embodiment is different from the light source device of the second embodiment in the structure of the wavelength conversion element 765, the position arrangement of the first reflecting element 744 is different, and an optical element for guiding the excitation light emitted from the wavelength conversion element 765 is added.

The wavelength converting element 765 is a wavelength converting element including a reflective portion and a transmissive portion. The wavelength conversion element comprising the reflection part and the transmission part refers to that the propagation direction of part of emergent rays of the wavelength conversion element is the same as that of incident rays, and the propagation direction of part of emergent rays is opposite to that of the incident rays. Specifically, the conversion region is located in a reflective portion of the wavelength conversion member 765, and the non-conversion region is located in a transmissive portion of the wavelength conversion member 765.

The first reflecting element 744 is accommodated in the first carrier 761 and is used for reflecting the excitation light transmitted through the non-conversion region. The adjustment device further comprises a second relay lens 747, a third reflective element 745 and a second reflective element 746. The second relay lens 747 is used for collecting and collimating the excitation light emitted from the first reflecting element 744. The third reflecting element 745 is configured to reflect the excitation light emitted from the second relay lens 747. The second reflecting element 746 is configured to reflect the excitation light emitted from the third reflecting element 745 to the light splitting and combining element 742, so that the excitation light emitted from the wavelength conversion element 765 and the received laser light are combined into a single path.

It is understood that the outer surface of the non-conversion region in this embodiment need not be provided with an inclined surface since the excitation light exits through the non-conversion region. It is understood that the second reflecting element 746 or the third reflecting element 745 may be omitted, that is, the position of the reflecting element is adjusted such that the excitation light emitted from the first reflecting element 744 can be reflected to the light splitting and combining element 742 by only one reflecting element. It is understood that the second relay lens 747 may be omitted.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a light source device 800 according to an eighth embodiment of the present invention. The light source device 800 of the present embodiment is different from the light source device of the seventh embodiment in that the structure of the filter element 867 is different, the second carrier 863 is directly fixed to the first carrier 861, the positions of the second relay lens 847 and the third reflective element 845 are different, a light combining element 846 for combining the excitation light emitted by the wavelength conversion element and the received laser light into one path is added, and the second reflective element is omitted.

Referring to fig. 14, fig. 14 is a schematic structural diagram of the color wheel assembly shown in fig. 13. Specifically, the non-filter region 869 is disposed in a central region of the filter element 867, and the filter region 868 is disposed at a periphery of the non-filter region 869, where the non-filter region 869 is in a circular distribution. Since the non-filter region 869 corresponding to the non-conversion region is disposed in the central region of the filter element 867, the region of the filter element 867 having the same and coincident axial center angle with the non-conversion region is a vacant region. Based on the rotation balance, the filter element 867 further includes a weight region 880, the weight region 880 is located in the free region and surrounds the filter region 868 to form a circular ring, and the circular ring is disposed around the periphery of the non-filter region 869. Wherein, the material of the weight region 880 may be the same as the material of the filter region 868.

The excitation light emitted from the first reflecting device 844 passes through the non-filter region 869 located in the central region, and then sequentially passes through the second relay lens 847, the third reflecting device 845 and the light combining device 846 to be emitted to the first relay lens 843. The laser light emitted from the light splitting and combining element 842 penetrates through the filter region 868 and then enters the light combining element 846, and is combined with the excitation light into one path through the light combining element 846. The light combining element 846 is used for transmitting the excited light and reflecting the excited light. In this embodiment, the light combining element 846 is a blue-reflective, yellow-transparent dichroic sheet. It can be understood that the third reflecting element 845 and the second relay lens 847 may be omitted, and the position of the light combining element 846 is adjusted, so that the excitation light emitted by the first reflecting element 844 and the received laser light emitted by the light splitting and combining element 842 can be combined into a single path at the light combining element 846.

Referring to fig. 15, fig. 15 is a schematic structural diagram of a light source device 900 according to a ninth embodiment of the invention. The light source device 900 of the present embodiment is different from the light source device of the fifth embodiment mainly in the structure of the wavelength conversion element 965, the arrangement position of the first reflection element 944, the structure of the filter element 967, and the arrangement position of the first relay lens 943, an optical element for guiding the excitation light emitted from the wavelength conversion element 965 and correcting the divergence angle thereof is added, a light combining element 946 for combining the excitation light emitted from the wavelength conversion element and the received laser light into one light, and the second reflection element is omitted.

Specifically, the wavelength converting element 965 is a wavelength converting element including a reflective portion and a transmissive portion. Wherein the converting region is located in a reflective portion of the wavelength converting element 965 and the non-converting region is located in a transmissive portion of the wavelength converting element 965.

The first reflective element 944 is accommodated in the first carrier. The excitation light emitted from the non-conversion region passes through the non-conversion region and is then reflected by the first reflecting element 944.

The filter element 967 includes a filter region 968 and a non-filter region 969, wherein the filter region 968 is fixed around the peripheral wall of the second carrier, and the non-filter region 969 is fixed at one end of the second carrier, so that the excitation light emitted from the first reflector 944 received in the first carrier can be diffused through the non-filter region 969 to enlarge the divergence angle thereof.

The adjusting device further includes a second relay lens 947 accommodated in the second supporting member for collimating the excitation light passing through the non-filtering region 969.

The light combining element 946 replaces the second reflective element and is disposed at a position of the second reflective element. The collimated excitation light is emitted through the light combining element 946, wherein the light combining element 946 is configured to transmit the excitation light and reflect the excited light. The excited light emitted from the light splitting and combining element 942 is reflected by the third reflecting element 945, then emitted to the light combining element 946 through the filter region 968, and combined with the excited light at the light combining element 946 into a path to be emitted to the first relay lens 943. In this embodiment, the light combination element 946 includes a blue-transmissive and yellow-reflective dichroic film layer.

In this embodiment, the first carrier and the second carrier may be integrated, and the non-filter region 969 is also accommodated in the cavity of the color wheel assembly, so that one driving device may be used to drive the first carrier and the second carrier simultaneously; alternatively, the first bearing member and the second bearing member may be separately disposed, and in this case, the first bearing member and the second bearing member may be driven by two driving devices respectively.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A color wheel assembly, comprising:

a first bearing member;

the wavelength conversion element is fixed around the peripheral wall of the first bearing piece and used for receiving exciting light of a light source and generating excited light;

the second bearing piece is fixedly connected with one end of the first bearing piece;

the light filtering element is fixed around the peripheral wall of the second bearing piece and is used for receiving and filtering the received laser; and

and the second reflecting element is accommodated in the second bearing piece and used for reflecting the excitation light and the received laser light which penetrate through the filter element.

2. The color wheel assembly according to claim 1, wherein the wavelength conversion element comprises a conversion region and a non-conversion region, the conversion region is arranged circumferentially, the conversion region is used for carrying out wavelength conversion on the excitation light and emitting excited light, and the non-conversion region is used for emitting the excitation light; the filter element comprises a filter area and a non-filter area, the filter area corresponds to the conversion area and is used for filtering the excited light, and the non-filter area corresponds to the non-conversion area and is used for enlarging the divergence angle of the excited light emitted by the non-conversion area.

3. The color wheel assembly as claimed in claim 2 wherein an outer surface of the non-conversion region is disposed obliquely with respect to a central axis of the color wheel assembly for reflecting the excitation light.

4. The color wheel assembly of claim 2 wherein the filter elements are disposed on an end surface of the first carrier and extend circumferentially around the second carrier, and the filter regions and the non-filter regions are disposed in a sector or a sector ring.

5. The color wheel assembly of claim 2 wherein the filter region and the non-filter region are disposed in a square curve.

6. The color wheel assembly as claimed in claim 5 wherein the incident surface of the second reflective element is concave.

7. The color wheel assembly as claimed in claim 2, wherein the non-conversion region is configured to transmit the excitation light, and the color wheel assembly further comprises a first reflective element housed in the first carrier for reflecting the excitation light transmitted through the non-conversion region.

8. The color wheel assembly of claim 7 wherein the filter elements are disposed on an end surface of the first carrier and extend circumferentially around the second carrier, the non-filter regions are distributed in a circular shape for transmitting the excitation light reflected by the first reflective elements, and the filter regions are disposed on a periphery of the non-filter regions and distributed in a fan-shaped ring shape.

9. The color wheel assembly as claimed in claim 7 wherein the filter region is fixed around the perimeter wall of the second carrier, and the non-filter region is disposed at one end of the second carrier for transmitting the excitation light reflected by the first reflective element; the color wheel assembly further comprises a light combining element accommodated in the second bearing piece and used for transmitting the exciting light reflected by the first reflecting element and transmitting the excited light passing through the filter region.

10. A light source device, comprising:

an excitation light source for generating excitation light; and

a color wheel assembly comprising:

the first bearing piece is arranged on the first bearing piece,

the wavelength conversion element is fixed around the peripheral wall of the first bearing piece, is arranged in the transmission path of the exciting light, and outputs the exciting light and the exciting light in a time sequence under the irradiation of the exciting light source,

a second bearing member fixedly connected to one end of the first bearing member, an

11. The light source device according to claim 10, wherein the wavelength conversion element includes a conversion region and a non-conversion region, the conversion region being arranged circumferentially, the conversion region being configured to wavelength-convert the excitation light and emit the excited light, and the non-conversion region being configured to emit the excitation light; the filter element comprises a filter area and a non-filter area, the filter area corresponds to the conversion area and is used for filtering the excited light, and the non-filter area corresponds to the non-conversion area and is used for enlarging the divergence angle of the excited light emitted by the non-conversion area.

12. The light source device according to claim 11, wherein the filter element is disposed on an end surface of the first supporting member and extends around a circumference of the second supporting member, and the filter region and the non-filter region are respectively disposed in a sector or a sector ring.

13. The light source device of claim 12, further comprising an adjustment device, the adjustment device comprising:

the light splitting and combining element is used for transmitting the exciting light and reflecting the received laser light, wherein the exciting light and the received laser light emitted by the wavelength conversion element are combined into one path at the light splitting and combining element;

the collecting lens is used for converging exciting light emitted by the exciting light source on the surface of the wavelength conversion element and collimating emergent light of the wavelength conversion element; and

and a first relay lens for condensing and emitting the excitation light and the received laser light emitted from the wavelength conversion element.

14. The light source device according to claim 13, wherein the adjusting device further includes a first reflecting element, the excitation light emitted from the wavelength conversion element sequentially passes through the collecting lens and the light splitting and combining element to be emitted to the first reflecting element, and is reflected by the first reflecting element to be emitted to the light splitting and combining element, so that the excitation light and the received laser light emitted from the wavelength conversion element are combined into one path at the light splitting and combining element.

15. The light source device of claim 13, wherein the non-conversion region is configured to reflect the excitation light, a main optical axis of the excitation light source is parallel to but not coincident with a main optical axis of the collection lens, and an outer surface of the non-conversion region is parallel to a central axis of the color wheel assembly.

16. The light source device according to claim 13, wherein the non-conversion region is configured to reflect the excitation light, the excitation light source is disposed coaxially with the collection lens, and an outer surface of the non-conversion region is disposed obliquely with respect to a central axis of the color wheel assembly.

17. The light source device according to claim 16, wherein the light source device further includes a compensation light source for emitting compensation light having a different spectral range from that of the excitation light, and a light combining element for reflecting the compensation light and transmitting the excitation light and the stimulated light emitted from the filter element, and the excitation light, the stimulated light, and the compensation light are combined into one path at the light combining element.

18. The light source device according to claim 13, further comprising a compensation light source for emitting compensation light having a spectral range different from that of the excitation light, and a light combining element disposed adjacent to the light splitting and combining element for transmitting the compensation light and reflecting the excitation light and the stimulated light emitted from the wavelength conversion element, wherein the excitation light, the stimulated light, and the compensation light are combined into one path at the light splitting and combining element.

19. The light source device according to claim 18, wherein the light splitting and combining element includes a transmission region and a light combining region, the transmission region is used for transmitting the compensation light emitted from the light combining element, the compensation light is converged in the transmission region, and the light combining region is used for reflecting the stimulated light and transmitting the excitation light.

20. The light source device according to claim 13, wherein the filter region and the non-filter region are respectively disposed in a square shape.

21. The light source device of claim 20, wherein the adjusting means further comprises:

and the first reflecting element is arranged adjacent to the light splitting and light combining element and is used for reflecting the exciting light emitted by the wavelength conversion element to the light splitting and light combining element.

22. The light source device according to claim 21, wherein an incident surface of the second reflecting element is a concave surface.

23. The light source device according to claim 21, wherein the light source device further includes a compensation light source for emitting compensation light having a different spectral range from that of the excitation light, and a light combining element for transmitting the compensation light and reflecting the excitation light emitted from the light splitting and combining element, and the excitation light, the stimulated light, and the compensation light are combined into one path at the light combining element.

24. The light source device according to any one of claims 17, 18, 19 and 23, wherein the compensation light source includes a light emitter, a scattering device and two lenses, and compensation light emitted by the light emitter is converged by one lens on the scattering device, and then converged by the other lens to exit to the light combining element.

25. The light source device according to any one of claims 17, 18, 19 and 23, wherein the conversion region is provided with a first wavelength conversion layer, the excitation light source is always on, the compensation light source is turned on when a region of the conversion region provided with the first wavelength conversion layer is located in a transmission path of the excitation light source, and is turned off in other regions of the conversion region and the non-conversion region, wherein the first wavelength conversion layer refers to a wavelength conversion layer that can convert excitation light into excited light having a spectral overlap with the compensation light.

26. The light source device according to claim 13, wherein the non-conversion region is configured to transmit the excitation light, and the adjustment device further comprises:

the first reflecting element is accommodated in the first bearing piece and used for reflecting the exciting light emitted by the wavelength conversion element; and

and the second reflecting element is used for reflecting the exciting light emitted by the first reflecting element to the light splitting and light combining element, wherein the exciting light emitted by the wavelength conversion element and the received laser light are combined into one path at the light splitting and light combining element.

27. The light source device according to claim 13, wherein the non-conversion region is configured to transmit the excitation light, and the adjustment device further comprises:

and the light combining element is used for reflecting the exciting light emitted by the first reflecting element and transmitting the received laser light emitted by the light splitting and light combining element, wherein the exciting light emitted by the wavelength conversion element and the received laser light are combined into a path at the position of the light combining element.

28. The light source device according to claim 27, wherein the filter region is disposed at a periphery of the non-filter region, the excitation light reflected by the first reflective element is incident on the light combining element through the non-filter region, and the excitation light emitted by the light splitting and combining element is incident on the light combining element through the filter region.

29. The light source device of claim 13, wherein the filter region is fixed around a peripheral wall of the second supporting member, and the non-filter region is disposed at an end of the second supporting member, the adjusting device further comprising:

the first reflecting element is accommodated in the first bearing piece and used for reflecting the exciting light emitted by the wavelength conversion element;

and the light combining element is used for transmitting the exciting light emitted through the non-filter region and reflecting the received laser emitted through the filter region, wherein the exciting light emitted by the wavelength conversion element and the received laser are combined into one path at the light combining element.

30. A projection system comprising the light source device of any one of claims 10-29.