WO2019061822A1 - Light source system and projection device - Google Patents

Abstract

A light source system (100) and a projection device, the light source system (100) comprising: an excitation light source (120), a wavelength conversion device (160), an adjustment device, and a correction device, wherein the excitation light source (120) is used to generate excitation Light, the wavelength conversion device (160) is configured to sequentially emit first light transmitted along the first optical path and second light transmitted along the second optical path, the adjusting device for guiding the first light incident along the overlapping optical path And adjusting, by the second light, the first light to a predetermined divergence angle, the correcting means is configured to guide the second light to be incident on the adjusting device, correcting a divergence angle of the second light, so that The second light and the first light are emitted from the adjusting device at the predetermined divergence angle and along the same optical path. The light source system (100) has a small volume and good light uniformity.

Description

Light source system and projection device Technical field

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

Background technique

In the field of projection technology, a laser irradiation wavelength conversion device is generally used to obtain laser light and scattered excitation light, and then the laser light and the scattered excitation light are combined. Wherein, the laser light emitted by the wavelength conversion device is separated from the optical path of the scattered excitation light, and different light-conducting devices are used to guide the laser and the scattered excitation light in the light source system, so that the laser light and the scattered excitation light are the same. The light path is coming out.

However, in the current light source system, the optical paths of the laser and the scattered excitation light do not overlap or overlap, resulting in the need for more light-conducting devices to achieve the combined light of the laser and the laser, resulting in a very large volume of the light source system. Large, not conducive to the miniaturization of the light source system and projection equipment.

Summary of the invention

In view of this, the present invention provides a light source system and a projection apparatus that can effectively reduce the volume.

A light source system comprising:

Exciting a light source for generating excitation light;

a wavelength conversion device comprising: a conversion region for wavelength-converting the excitation light and a first light exiting the first optical path, and a non-conversion region for scattering the excitation light And emitting a second light along the second optical path, the conversion region and the non-conversion region are alternately located on the optical path of the excitation light, so that the wavelength conversion device sequentially emits the first light and the second light;

Adjusting means for guiding the first light and the second light incident along the overlapping optical path, The first light adjustment is emitted at a predetermined divergence angle; and

a correcting device for guiding the second light to the adjusting device to correct a divergence angle of the second light such that the second light and the first light are at the same divergence angle and are the same The light path exits from the adjustment device.

A projection apparatus applying the light source system as described above.

The invention provides a light source system and a projection device, wherein a first optical path of the light source system overlaps with a second optical path, so that less light guiding devices are used in the light source system and less optical path space is occupied, thereby effectively reducing the The volume of the light source system facilitates the miniaturization of the light source system and the projection apparatus to which the light source system is applied. In addition, the first light and the second light are emitted along the same optical path at the predetermined divergence angle, so that the optical expansion amounts are matched, thereby achieving better uniformity.

DRAWINGS

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

FIG. 2 is a schematic top plan view of the wavelength conversion device shown in FIG. 1. FIG.

FIG. 3 is a schematic diagram of a first optical path and a second optical path at an entrance of a first light homogenizing device according to other embodiments.

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

Figure 5 is a schematic view showing the structure of the second reflecting member shown in Figure 4.

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

Main component symbol description

Light source system 100, 300, 400 Excitation source 120 Supplementary light source 430 illuminator 121,431 Second uniformizing device 122 Scattering element 432 lens 433

Collecting lens group 141, 441 First beam splitting element 143, 443 First converging lens 145, 445 Second beam splitting element 147 Second converging lens 149, 249, 449 First reflective element 151, 451 Second reflective element 153,353 flat 353a Spherical 353b Wavelength conversion device 160 Conversion area 161 Red segment 162 Green segment 163 Non-conversion zone 164 Drive unit 166 First uniform light device 180, 280, 380, 480

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

Detailed ways

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a light source system 100 according to a first embodiment of the present invention. The light source system 100 applied to a projection apparatus includes an excitation light source 120, an adjustment device, a correction device, a wavelength conversion device 160, and a first light homogenizing device 180. Wherein, the excitation light source 120 is used to generate excitation light of at least one color. The wavelength conversion device 160 is configured to perform wavelength conversion on the excitation light and to sequentially emit the first light and the second light. The adjusting device is configured to guide the first light and the second light incident along the overlapping optical path, and adjust the first light to a predetermined divergence angle. The overlapping optical path means that at least a partial overlap of the transmission optical path of the first light and the transmission optical path of the second light. The correcting means is configured to guide the second light to the adjusting device to correct the divergence angle of the second light such that the second light and the first light exit the adjusting device at a predetermined divergence angle and along the same optical path. The first light homogenizing device 180 requires that the divergence angle of the incident light is greater than the critical angle so that the incident light can It is sufficient to undergo multiple reflections in the first light homogenizing device 180 to obtain better uniformity after exiting from the first light homogenizing device 180. In this embodiment, the first light homogenizing device 180 performs uniform light on the first light and the second light that are emitted at a predetermined divergence angle, wherein the preset divergence angle is greater than the critical angle of the first light homogenizing device 180.

Specifically, the excitation light source 120 includes an illuminant 121 for generating excitation light and a second shimming device 122 for aligning the excitation light.

Further, the excitation light source 120 may be a blue light source that emits blue excitation light. It can be understood that the excitation light source 120 is not limited to the blue light source, and the excitation light source 120 may also be a purple light source, a red light source or a green light source. In the present embodiment, the illuminator 121 is a blue laser for emitting blue laser light as excitation light. It can be understood that the illuminant 121 can include one, two or more blue laser arrays, and the number of lasers can be selected according to actual needs.

The second light homogenizing device 122 is configured to homogenize the excitation light and then exit to the subsequent calibration device. In this embodiment, the second light homogenizing device 122 is a light homogenizing rod. It can be understood that in other embodiments, the second light homogenizing device 122 may include a fly-eye lens, a light beam, a diffuser or a scattering wheel, and the like. Not limited to this.

Please refer to FIG. 1 to FIG. 2 together. FIG. 2 is a schematic top view of the wavelength conversion device 160 shown in FIG. 1 . The wavelength conversion device 160 includes a conversion region 161, a non-conversion region 164, and a driving unit 166 disposed at the bottom of the wavelength conversion device 160. In this embodiment, the driving unit 166 is a motor, the driving unit 166 drives the wavelength conversion device 160 to periodically move, and the wavelength conversion device 160 rotates at a high speed with the driving unit 166 as an axis.

The conversion region 161 is for wavelength-converting the excitation light and emitting the first light along the first optical path, the first light being the received laser light. The non-conversion region 164 is for scattering the excitation light and emitting the second light along the second optical path, the second light being the scattered excitation light. The conversion region 161 and the non-conversion region 164 are alternately located on the optical path where the excitation light emitted by the excitation light source 120 is located under the action of the driving unit 166. The conversion region 161 and the non-conversion region 164 are alternately located on the optical path of the excitation light such that the wavelength conversion device sequentially emits the first light and the second light.

Specifically, the conversion region 161 is provided with a wavelength converting material to generate first light in the form of Lambertian light of at least one color under excitation of excitation light. As shown in FIG. 2, the conversion area 161 It is divided into a red segment 162 and a green segment 163. The red segment 162 sets a red phosphor to produce a red first light upon excitation of the excitation light; the green segment 163 sets a green phosphor to produce a green first light upon excitation of the excitation light. It can be understood that in other embodiments, the conversion region 161 can also set phosphors of other colors than red and green to generate first light of other colors. For example, only the yellow phosphor may be disposed in the conversion region 161 to generate a yellow first light. The yellow first light and the blue excitation light are homogenized in the first light homogenizing device 180 to form white light.

In the present embodiment, the wavelength conversion device 160 is a reflective color wheel, and the non-conversion region 164 is provided with a Gaussian diffusion plate to diffuse the excitation light so that the divergence angle of the excitation light becomes large. In addition, the Gaussian diffuser can simultaneously achieve decoherence and homogenization to alleviate laser speckle. In this embodiment, the Gaussian scattering sheet is a reflective Gaussian scattering sheet to scatter and reflect the excitation light.

When the excitation light is irradiated onto the surface of the wavelength conversion device 160, the red segment 162, the green segment 163, and the non-conversion region 164 are periodically alternately located on the optical path where the excitation light is located, driven by the driving unit 166, to generate a red first light. Green first light - blue second light sequence.

The adjusting device includes a collecting lens group 141, a first beam splitting light element 143, a first collecting lens 145, a second beam splitting light element 147, and a second collecting lens 149. Since the preset divergence angle of the first light is greater than the critical angle, the curvatures of the selected collection lens group 141, the first converging lens 145, and the second converging lens 149 are determined according to the preset divergence angle of the first light, and the lens group 141 is collected. The curvatures of the converging lens 145 and the second converging lens 149 cooperate with each other such that the first light sequentially passes through the collecting lens group 141, the first beam combining light element 143, the first converging lens 145, the second beam splitting light element 147, and the second. The condenser lens 149 is emitted from the adjustment device at a predetermined divergence angle.

Specifically, the collection lens group 141 is disposed adjacent to the wavelength conversion device 160, and the collection lens group 141 includes a plurality of optical axes arranged in a plurality of optical axes, the optical axes of the plurality of optical axes being different from each other, and the optical axis being perpendicular to the surface of the wavelength conversion device 160. The closer the collection lens group 141 is to the wavelength conversion device 160, the smaller the focal length of the lens is.

The excitation light emitted from the excitation light source 120 is incident in parallel and offset from the optical axis to the collection lens group 141, so that the excitation light is irradiated to the wavelength conversion device 160 at a predetermined inclination angle, and the excitation light passes through After the convergence of the collection lens group 141, the spot formed on the wavelength conversion device 160 is small. Of course, in addition to the collecting lens group 141, other optical devices may be selected to cause the excitation light emitted in parallel from the excitation light source to be incident obliquely to the wavelength conversion device 160.

When the conversion region 161 is located on the optical path where the excitation light is located, the first light of the Lambertian form emitted from the wavelength conversion device 160 is collimated by the collection lens group 141 and then emitted to the first beam splitting light element 143. The incident excitation light path of the wavelength conversion device 160 overlaps with the emitted first optical path.

When the non-conversion region 164 is located on the optical path where the excitation light is located, the reflective Gaussian diffusion sheet scatters the excitation light and reflects it. According to the law of reflection, the wavelength conversion device 160 emits the second light along the second optical path at a predetermined tilt angle, and the incident excitation light path of the wavelength conversion device 160 and the emitted second optical path are symmetrically distributed along the optical axis and do not overlap. The second light is collimated by the collecting lens group 141 and then emitted to the first beam combining light element 143.

The first beam splitting light element 143 and the second beam splitting light combining element 147 may adopt an optical structure of wavelength splitting, that is, splitting and combining light according to different wavelength ranges of incident light. As an embodiment of the wavelength splitting, the first beam splitting light element 143 is disposed between the collecting lens group and the first collecting lens for transmitting the excitation light and the second light to reflect the first light. Wherein, the excitation light has the same wavelength range as the second light. The second splitting light combining element is disposed between the first converging lens and the second converging lens for transmitting the second light and reflecting the first light.

After the first light is reflected by the first beam splitting light element 143, it is sequentially concentrated by the first condenser lens 145, the second beam splitting light element 147 is reflected, and the second collecting lens 149 is concentrated, and then emitted to the first wave at a predetermined divergence angle. The light homogenizing device 180.

The second light is transmitted through the first beam splitting light element 143 and then incident on the correcting means. The correcting device includes a first reflective element 151 and a second reflective element 153. In this embodiment, the first reflective element 151 is a convex mirror, and the second reflective element 153 is a concave mirror. Both the first reflective element 151 and the second reflective element 153 are used to reflect the second light and cooperate to correct the propagation direction and divergence angle of the second light. The second light is sequentially reflected by the first reflective element 151, the first converging lens 145 is converged, the second dichroic combining element 147 is transmitted, the second reflective element 153 is reflected, and the second dichroic combining element 147 is transmitted and then incident to the second converging lens. 149. The second light and the first light are emitted to the first light homogenizing device 180 along the same optical path at a predetermined divergence angle.

The first light and the second light can completely fill the cross section of the first light homogenizing device 180, and the first light and the second light are reflected multiple times in the first light homogenizing device 180, thereby being emitted from the first light homogenizing device 180. The first light and the second light enable better uniformity. As shown in FIG. 1, the spots of the first light and the second light incident on the first light homogenizing device 180 completely fall into the entrance of the first light homogenizing device 180, reducing the loss of incident light, and improving the light source system 100. Light output efficiency. At the same time, the first light and the second light can completely fill the cross section of the first light homogenizing device 180, and a better uniform light effect can be achieved. Specifically, the first light is focused on the entrance face of the first light homogenizing device 180, is linearly transmitted inside the first light homogenizing device 180, and can fill the cross section of the first light homogenizing device; the second light is focused on the first uniform light. At the entrance end of the device 180, the entrance face of the first light homogenizing device 180 is in a defocused state and its spot area is equal to the area of the entrance face such that the second light can also fill the first light homogenizing device 180 at the entrance face. Cross-section.

In summary, the first light and the second light have the same spot size in the first light homogenizing device 180 at the same divergence angle, and the optical spread of the first light and the second light in the first light homogenizing device 180. The matching, and then the uniformization of the first light homogenizing device 180, can achieve better uniformity.

In other embodiments, please refer to FIG. 3 , which is a schematic diagram of a first optical path and a second optical path at the entrance of the first light homogenizing device 280 provided by other embodiments. The main difference between this embodiment and the first embodiment is that, in this embodiment, the first light is focused on the entrance face of the first light homogenizing device 280, and is linearly transmitted inside the first light homogenizing device 280, and can be filled with the first light. a cross section of the light homogenizing device 280; the second light passes through the entrance face of the first light homogenizing device 280 and is focused at B of the interior of the first light homogenizing device 280, the second light is focused at the front of B, at the entrance face The spot area is just equal to the area of the entrance face, so that the second light can also fill the cross section of the first light homogenizing device 280 after being defocused at B, and a better uniform light effect can be achieved. At the same time, the spots of the first light and the second light completely fall into the opening of the first light homogenizing device 280, and the light energy loss of the first light and the second light is small, and the light extraction efficiency is high.

The light source system 100 provided in the first embodiment of the present invention includes an adjusting device and a correcting device for guiding the first light transmitted along the first optical path and the second light transmitted along the second optical path, and the adjusting device At least partial overlap between an optical path and a second optical path The use of fewer light guiding devices in the light source system 100 effectively reduces the volume of the light source system 100 and facilitates the miniaturization of the light source system 100 and the projection device. Further, the correcting means is configured to guide the second light to the adjusting device and correct the divergence angle of the second light such that the first light and the second light exit to the first light homogenizing device 180 at a predetermined divergence angle and along the same optical path, and The spot areas formed in the first light homogenizing device 180 are the same, so that the etendues are matched, and further uniformity can be achieved after passing through the first light homogenizing device 180.

Referring to FIG. 4 to FIG. 5, FIG. 4 is a schematic structural diagram of a light source system 300 according to a second embodiment of the present invention, and FIG. 5 is a schematic structural view of the second reflective component 353 shown in FIG. In this embodiment, the main difference between the light source system 300 and the light source system 100 in the first embodiment is that the second reflective element 353 is applied to the light source system 300 instead of the second splitting light combining element 147 and the second in the light source system 100. The reflective element 153 not only reduces the number of optical devices in the light source system 300, but also simplifies the optical path structure. Other components in the light source system 300 are the same as the light source system 100 and will not be described again.

The second reflective element 353 is a convex lens. The outer surface of the second reflective member 353 is for transmitting the second light and reflects the first light, and an inner surface of the second reflective member 353 is provided with a reflective film for concentrating and reflecting the second light. Specifically, in this embodiment, the excitation light is blue light, and the first light includes red first light and green first light. The convex lens is a plano-convex lens, and a blue anti-yellow dichroic film is disposed outside the plane 353a of the plano-convex lens, and a specular reflection material or an anti-blue translucent dichroic film is disposed on the inner side of the plano-convex lens surface 353b. It will be appreciated that in other embodiments, a dichroic film having other central wavelengths may be disposed on the convex lens as desired.

In the light source system 300 provided by the second embodiment of the present invention, less optical components are used and the structure is compact. The same as the first embodiment, the first optical path in the light source system 300 overlaps with the second optical path, so that less light guiding means is used in the light source system 300, which effectively reduces the volume of the light source system 300, and is beneficial to the light source system. The miniaturization design of the projection device of 300 and the application light source system 300. In addition, the first light and the second light are emitted to the first light homogenizing device 380 at a predetermined divergence angle and along the same optical path, and the spot areas formed in the first light homogenizing device 380 are the same, so that the optical expansion amounts match, and then The first uniform light device 380 can achieve better uniformity.

Please refer to FIG. 6 , which is a structural diagram of a light source system 400 according to a third embodiment of the present invention. intention. The light source system 400 differs from the light source system 100 in that the light source system 400 includes a supplemental light source 430. Other parts in this embodiment are the same as those in the first embodiment, and are not described again.

The supplemental light source 430 is used to emit supplemental light, thereby increasing the brightness of the light source system 400. The supplemental light source 430 includes an illuminator 431, a scattering element 432, and a lens 433. The illuminant 431 is used to emit supplemental light, the scattering element 432 is used to scatter the supplemental light, and the lens 433 converges and directs the supplemental light emitted by the scattering element 432 to the first reflective element 451.

In this embodiment, the supplemental light source 430 may be a red light source that emits red complementary light. It can be understood that the supplemental light source 430 is not limited to the red light source, and the supplemental light source 430 may also be a purple light source or a green light source or the like. In this embodiment, the illuminant 431 includes a red laser for emitting red laser light as supplemental light. It can be understood that the illuminant 431 can include one, two or more red lasers, and the number of lasers can be selected according to actual needs.

The scattering element 432 is used to homogenize, decoherent, and expand the etendue of the supplemental light to better match the first light. In the present embodiment, the scattering element 432 is a scattering wheel. It can be understood that the scattering element 432 is not limited to the scattering wheel, and may be other scattering elements such as a diffusion sheet.

The first reflective element 451 reflects the excitation light and transmits the supplemental light. In this embodiment, the excitation light is blue light and the supplementary light is red light, and the first reflective element 451 may be provided with a red translucent blue dichroic film or a translucent anti-blue dichroic color film.

The supplemental light passes through the first reflective element 451 and is focused on the vicinity of the first beam splitting light element 443. The spot position of the first splitting light combining element 443 corresponding to the supplementary light is provided with a coating area, and the supplementary light passes through the coating area and the first light. After being combined, the light is incident on the first converging lens 445, and the complementary light and the first light are emitted from the second converging lens 449 to the first homogenizing device 480 at a predetermined divergence angle.

Since the spot light irradiated onto the first spectral combining element 443 by the supplemental light is small, the area of the plating region can be reduced, and the loss of the red first light emitted from the collecting lens group 441 can be reduced.

Supplemental light converges from the second converging lens 449 and the second light at the same divergence angle C at the front of a uniform light device 480.

In the third embodiment of the present invention, the supplemental light source 430 is added to increase the brightness of the light. The same as the first embodiment, the first optical path in the light source system 400 overlaps with the second optical path, so that less light guiding means is used in the light source system 400, which effectively reduces the volume of the light source system 400, and is beneficial to the light source system. The miniaturization design of the projection device of 400 and the application light source system 400. In addition, the first light and the second light and the supplementary light are emitted to the first light homogenizing device 480 at a predetermined divergence angle and along the same optical path, and the spot areas formed in the first light homogenizing device 480 are the same, so that the optical expansion amount is matched. Further uniformity can be achieved after passing through the first light homogenizing device 480.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation made by the specification and the drawings of the present invention may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims (12)

A light source system, comprising: Exciting a light source for generating excitation light; a wavelength conversion device comprising: a conversion region for wavelength-converting the excitation light and a first light exiting the first optical path, and a non-conversion region for scattering the excitation light And emitting a second light along the second optical path, the conversion region and the non-conversion region are alternately located on the optical path of the excitation light, so that the wavelength conversion device sequentially emits the first light and the second light; Adjusting means for guiding the first light and the second light incident along the overlapping optical path, adjusting the first light to a predetermined divergence angle; and a correcting device for guiding the second light to the adjusting device to correct a divergence angle of the second light such that the second light and the first light are at the same divergence angle and are the same The light path exits from the adjustment device. The light source system according to claim 1, wherein said adjusting means comprises a collecting lens group, a first converging lens and a second converging lens having curvatures cooperating, such that said first light passes through said collecting lens group in sequence The first converging lens and the second converging lens are emitted from the second converging lens at a predetermined divergence angle. The light source system according to claim 2, wherein said collection lens group is disposed adjacent to said wavelength conversion device, said collection lens group includes a plurality of lenses having optical axes in the same line, and excitation light emitted from said excitation light source is parallel And entering the collection lens group from the optical axis, and after being concentrated by the collection lens group, irradiating to the wavelength conversion device at a predetermined tilt angle, the incident excitation light path and the emission of the wavelength conversion device The two light paths do not overlap. The light source system according to claim 2, wherein the adjusting device further comprises a first beam splitting light combining element and a second beam splitting light combining element, wherein the first beam splitting light combining element is disposed in the collecting lens group and The first converging lens is configured to transmit the excitation light and the second light to reflect the first light, and the second dichroic combining element is disposed on the first converging lens and the first Between two converging lenses for transmitting the second light, Shooting the first light. A light source system according to claim 2, wherein said correcting means comprises a first reflective element and a second reflective element, said first reflective element and said second reflective element being both for reflecting light and interacting with each other The light divergence angle is corrected, and the second light is incident on the second converging lens after passing through the first reflective element and the second reflective element in sequence. The light source system of claim 5 wherein said first reflective element is a convex mirror and said second reflective element is a concave mirror. The light source system according to claim 5, wherein said first reflective element and said second reflective element are both convex mirrors, and an outer surface of said second reflective element is for reflecting said first light And transmitting the second light, an inner surface of the second reflective element is provided with a reflective film for collecting and reflecting the second light. A light source system according to claim 4, wherein said light source system further comprises a supplemental light source for emitting supplemental light, said supplemental light being focused near said first beam splitting unit, said first beam splitting light a spot area corresponding to the spot light corresponding to the supplemental light is disposed, wherein the supplemental light is combined with the first light through the plated area, and then incident on the adjusting device, the supplementary light and the first A light exits the adjustment device at the predetermined divergence angle along the same optical path. A light source system according to claim 8, wherein said supplemental light source comprises an illuminant for emitting said supplemental light, a scattering element for scattering said supplemental light, and a supplement for scattering A converging lens in which light is concentrated. The light source system according to claim 1, wherein the light source system further comprises a first light homogenizing device, and the first light and the second light emitted at the predetermined divergence angle pass through the first light homogenizing device After the light is even out, it will emerge. The light source system according to claim 10, wherein said first light and said second light are focused at an entrance front end or an entrance face of said first light homogenizing device; or said first light and said The second light is in an out-of-focus state at the entrance of the first light-shaping device and is focused within the first light-shading device inlet. A projection apparatus, characterized in that the projection apparatus applies the light source system according to any one of claims 1-11.

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