CN218567815U - Light source device and projection system - Google Patents

Abstract

The application provides a light source device and a projection system, mainly relates to the technical field of projection, and can solve the problem that the light source device cannot meet the position requirements of two convergent light spots simultaneously. Wherein, the light source device includes: the light source comprises a first light source and a second light source. The spectroscope is used for emitting a first light beam emitted by the first light source to the wavelength conversion device and emitting a second light beam emitted by the second light source out of the light source device. The wavelength conversion device is used for converting the received first light beam into a third light beam and emitting the third light beam out of the light source device. The light source device further comprises a dimming component, the dimming component is arranged between the spectroscope and the light source, and the dimming component is used for adjusting the light beam angle of the first light beam and/or the second light beam.

Description

Light source device and projection system

Technical Field

The utility model relates to a projection technology field especially relates to a light source device and projection system.

Background

The light source device in the existing laser projection technology generally comprises a light source, a spectroscope and a wavelength conversion device, wherein exciting light provided by the light source is subjected to light splitting treatment by the spectroscope, is converted into excited light by the wavelength conversion device and then enters the aperture of the optical machine.

In the existing light source device, deviation exists between the arrangement position and the assembly of the spectroscope, so that the position of a light spot of stimulated luminescence converged in an aperture is deviated, and at the moment, the position of the light spot of an emitted light beam can be normal by adjusting the position of the spectroscope. However, most of the light source devices are usually provided with two light sources, so when the two light sources are deviated, the difficulty of adjusting only one spectroscope is high, and the requirements of the positions of two converging light spots cannot be met simultaneously, thereby affecting the final projection effect.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the present application provides a light source device and a projection system, which can solve the problem that the spot position of the emitted light beam is shifted.

In a first aspect, the present application provides a light source device, comprising: the light source comprises a first light source and a second light source. The spectroscope is used for emitting a first light beam emitted by the first light source to the wavelength conversion device and emitting a second light beam emitted by the second light source out of the light source device. The wavelength conversion device is used for converting the received first light beam into a third light beam and emitting the third light beam out of the light source device. The light source device further comprises a dimming component, the dimming component is arranged between the spectroscope and the light source, and the dimming component is used for adjusting the light beam angle of the first light beam and/or the second light beam.

Based on the light source device that this application provided, can adjust two light sources through the subassembly of adjusting luminance, satisfied the position requirement to two convergent faculas simultaneously. The dimming device in the dimming assembly is small in size, production cost is reduced, the adjustment of the beam angle of the first light beam and/or the second light beam can be achieved without changing the beam path of the emitted light beam by adding a reflector, and when the adjustment is carried out, the first light beam and/or the second light beam can deflect towards different directions only by rotating the dimming device, so that the operation is convenient, and the projection effect of a projection system using the light source device is ensured.

In one possible design, the dimming assembly includes a first dimming device disposed between the first light source and the beam splitter, and the first dimming device is configured to adjust a beam angle of the first light beam emitted by the first light source.

In one possible embodiment, the dimming assembly comprises a first dimming device and a second dimming device. The first dimming device is arranged between the first light source and the spectroscope and is used for adjusting the beam angle of the first light beam emitted by the first light source. The second dimming device is arranged between the second light source and the spectroscope and is used for adjusting the beam angle of the second light beam emitted by the second light source.

In one possible design, the dimming assembly includes a second dimming device disposed between the second light source and the beam splitter, and the second dimming device is configured to adjust a beam angle of the second light beam emitted by the second light source.

Based on the above optional mode, the beam angle of the second light beam can be adjusted by the second dimming device, so that the spot position of the second light beam finally emitted from the light source device is normal.

In one possible design, the dimming device in the dimming assembly comprises at least one wedge-shaped lens, and when the dimming device comprises a plurality of wedge-shaped lenses, the plurality of wedge-shaped lenses are stacked.

In one possible design, the wedge-shaped lens is circular.

Based on the above optional mode, the first light beam can be deflected towards different directions by rotating the circular wedge-shaped lens, and the operation is convenient. A plurality of circular wedge lenses stack the setting, can improve the accuracy that first light beam deflected behind circular wedge lens through rotating a plurality of circular wedge lenses.

In a possible design, the light source device further includes a first lens group, the first lens group includes two lenses, the first lens group is disposed between the beam splitter and the wavelength conversion device, and the first lens group is configured to focus and emit the first light beam to the wavelength conversion device.

In a possible design, the lens assembly further includes a second lens assembly, the second lens assembly includes at least one lens, the second lens assembly is disposed on a light path where the third light beam and the second light beam are combined, and the second lens assembly is configured to focus the third light beam and the second light beam and emit the light source device.

In a second aspect, the present application provides a projection system, including the light source apparatus described in any one of the optional manners of the first aspect.

In a possible design, the projection system further includes a light engine, the light engine is provided with a light engine aperture, and the second light beam and the third light beam are converged into a light spot and then are incident into the light engine aperture.

The construction of the present application and other objects and advantages thereof will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

Drawings

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

FIG. 1 is a first schematic structural diagram of a light source device in the prior art;

FIG. 2 is a second schematic view of a prior art light source device;

FIG. 3 is a schematic structural diagram III of a light source device in the prior art;

FIG. 4 is a schematic structural diagram of a light source device in the prior art;

FIG. 5 is a schematic structural diagram of a light source device in the prior art;

FIG. 6 is a sixth schematic view of a prior art light source device;

FIG. 7 is a seventh schematic structural diagram of a light source device in the prior art;

fig. 8 is a first schematic structural diagram of a light source device according to a first embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a light source device according to a first embodiment of the present application;

fig. 10 is a schematic structural diagram of a light source device according to a first embodiment of the present application;

fig. 11 is a schematic structural diagram of a light source device according to a first embodiment of the present application;

fig. 12 is a schematic structural diagram of a light source device according to a first embodiment of the present application;

fig. 13 is a front view of a dimming device provided in an embodiment of the present application;

fig. 14 is a side view of a dimming device provided in accordance with an embodiment of the present application;

fig. 15 is a schematic structural diagram six of a light source device according to a first embodiment of the present application;

fig. 16 is a schematic structural diagram seven of a light source device according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of a projection system according to a second embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

1-a light source;

101-a first light source;

102-a second light source;

2-a spectroscope;

3-a wavelength conversion device;

4-a dimming component;

401-first dimming means;

402-a second dimming device;

5-a first lens group;

6-a second lens group;

7-an optical machine;

701-the aperture of the optical machine;

8-mirror.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present application, it is to be understood that the terms "inner," "outer," "upper," "bottom," "front," "back," and the like, if any, refer to an orientation or positional relationship, if any, that is used for ease of description and to simplify the description, but do not indicate or imply that the referenced device or element must be constructed and operated in a particular orientation and therefore should not be construed as limiting the present application.

The light source device in the prior art of laser projection generally comprises a first light source 101, a beam splitter 2, a wavelength conversion device 3, a first lens group 5 and a second lens group 6. The first light source 101 emits exciting light, the exciting light is emitted to the first lens group 5 through the spectroscope 2, the first lens group 5 focuses and emits the exciting light to the wavelength conversion device 3, and since the wavelength conversion device 3 is usually provided with fluorescent powder, the wavelength conversion device 3 can convert the exciting light into stimulated light and emit the stimulated light out of the light source device to the optical machine 7. It should be noted here that, since the technology of the three primary colors (red, blue, and green) laser is not mature, the existing light source device generally uses a single color laser and other conversion devices (such as phosphor excited light device) to realize the projection of the single color light source. For example, assuming that the excitation light is blue laser, the wavelength conversion device 3 is provided with green and red phosphors, after the wavelength conversion device 3 receives the blue laser, the blue laser can be converted into green excited light and red excited light, and then the blue laser, the red excited light and the green excited light are focused by the second lens group 6 and emitted into the optical engine 7, and the spot position of the emitted light beam is as shown in fig. 1, so that the conversion from monochromatic laser to white light for projection is realized. Here, it should be noted that the blue laser light, the red excited light, and the green excited light that finally exit the light source device are collectively referred to as an exit beam in the present application.

However, the conventional light source device may have a problem that the spot position of the emitted light beam is shifted, and the reasons for this problem are generally two types: one situation is that the installation position and assembly of the beam splitter may have a deviation as shown in fig. 2, and thus the position of the light spot where the outgoing light beam is converged on the light source device is shown in fig. 2, compared with fig. 1, the position of the light spot has a deviation, and a part of the outgoing light beam cannot exit the light source device, which affects the display uniformity and further affects the final projection effect.

Another situation is that the first light source 101 has an angular tolerance of light emission, so that the excitation light emitted from the first light source 101 cannot be always consistent, as shown in fig. 3, the excitation light emitted from the first light source 101 also has a position deviation, which also causes the position of a light spot of the finally emitted light beam converged on the light source device to shift, thereby affecting the final projection effect.

In the case where one of the light sources (i.e., the first light source 101) is present, the spot position of the outgoing light beam can be made normal by adjusting the position of the beam splitter 2. However, two light sources are usually disposed in most light source devices, as shown in fig. 4, the light source 1 device includes a first light source 101, a second light source 102, a beam splitter 2, a wavelength conversion device 3, a first lens group 5 and a second lens group 6, the excited light emitted from the second light source 102 by the beam splitter 2 and the wavelength conversion device 3 is focused by the second lens group 6 and emitted into the optical engine 7, and at this time, the spot position of the emitted light beam is as shown in fig. 4, thus realizing the projection of the two-color light source.

However, the second light source 102 in the light source device provided with the two-color light source also has the above-mentioned problem: the deviation of the light spot position on the optical engine 7 caused by the deviation of the installation position and assembly of the beam splitter 2 or the angle tolerance of the light emitted by the second light source 102 itself results in the deviation as shown in fig. 5 or fig. 6. At this time, the difficulty of adjusting only one spectroscope 2 is large, and the position requirements of two convergent light spots cannot be met simultaneously.

In contrast, in the case where the two light sources (i.e., the first light source 101 and the second light source 102) are provided, in order to solve the problem of the spot position deviation of the emitted light beam, in the prior art, a reflecting mirror 8 is usually additionally provided in the light source device, the reflecting mirror 8 is generally disposed in the light path before the excitation light reaches the beam splitter 2, for example, as shown in fig. 7, the reflecting mirror 8 is disposed between the first light source 101 and the beam splitter 2, the excitation light emitted from the first light source 101 is reflected to the beam splitter 2 by the reflecting mirror 8, and the spot position where the excitation light is converged on the light source device is adjusted by adjusting the position and the reflection angle of the reflecting mirror 8. Similarly, if the second light beam emitted from the second light source 102 is to be adjusted, a reflecting mirror 8 may be added between the second light source 102 and the beam splitter 2. Although this adjustment method can adjust the spot position where the outgoing light beam is converged on the light source device, the addition of the mirror 8 changes the initial beam path of the outgoing light beam, and thus, the volume of the light source device needs to be enlarged, which increases the production cost. Meanwhile, the setting position and the reflection angle of the reflecting mirror 8 need to be designed and adjusted in the face of different deviations, and thus, the adjustment is time-consuming and labor-consuming.

Therefore, the application provides a light source device and a projection system, which can solve the problem that the light source device cannot meet the position requirements of two convergent light spots at the same time.

The light source device and the projection system provided by the present application are described in detail below with reference to the accompanying drawings.

Example one

Fig. 8 shows a light source device according to an embodiment of the present application, which includes a light source 1, a beam splitter 2, and a wavelength conversion device 3. The light source 1 includes a first light source 101 and a second light source 102, the first light source 101 is used for emitting a first light beam (1 a shown in fig. 8), and the second light source 102 is used for emitting a second light beam (2 a shown in fig. 8). The beam splitter 2 emits the first light beam 1a emitted by the first light source 101 to the wavelength conversion device 3 and emits the second light beam 2a emitted by the second light source 102 out of the light source device, and the wavelength conversion device 3 converts the received first light beam 1a into a third light beam (3 a shown in fig. 8) and emits the third light beam out of the light source device.

In one example, the wavelength conversion device 3 may be a phosphor wheel (phosphor wheel) on which a corresponding conversion material (i.e. a fluorescent material, such as two phosphors of red, green, etc.) may be disposed.

Alternatively, the first Light source 101 may be any one of a Laser Diode (LD) and a Light Emitting Diode (LED), and the first Light beam 1a emitted is Light having a wavelength of 455nm (nanometers) or less. For example, the first beam 1a may be a blue laser. The blue laser emitted by the first light source 101 is adjusted by the light adjusting component 4 and then emitted to the wavelength conversion device 3 through the beam splitter 2, in this example, two kinds of red and green fluorescent powders may be disposed on the wavelength conversion device 3, and the blue laser emitted to the wavelength conversion device 3 may be converted into a third light beam (blue excitation light + red excited light + green excited light) by the wavelength conversion device 3 and emitted out of the light source device, where the output direction of the third light beam is opposite to the output direction of the blue laser.

For another example, the first light beam 1a may be violet light, ultraviolet light, or the like, and the application is not limited thereto.

Alternatively, the second Light source 102 may be any one of an LD, an LED, and an Organic Light-Emitting Diode (OLED).

In one example, because the efficiency of filtering out the red light meeting the requirement from the excited light is relatively low, the color of the light source device finally emitted is poor, therefore, the second light beam 2a emitted by the second light source 102 may be red light, and the red light serving as the supplement light of the third light beam 3a and the third light beam 3a are emitted out of the light source device together, so as to improve the color of the red light, thereby ensuring the color finally displayed by the light source device.

In one example, the second light beam 2a emitted by the second light source 102 may be green light, and the green light is emitted out of the light source device together with the third light beam 3a as a supplement light of the third light beam 3a, so as to improve the color of the green excited light, thereby ensuring the color finally displayed by the light source device.

When the first light source 101 and/or the second light source 102 are displaced, the deviation of the first light beam 1a or the second light beam 2a can be adjusted by adjusting the position of the beam splitter 2, in order to simultaneously meet the position requirement of the light source apparatus for two convergent light spots, the light source apparatus provided by the present application further includes a dimming component 4 as shown in fig. 7, the dimming component 4 is disposed between the beam splitter 2 and the light source 1 (i.e., the first light source 101 and/or the second light source 102), and the dimming component 4 can adjust the light beam angle of the first light beam and/or the second light beam.

In one example, as shown in fig. 9, the dimming assembly 4 may include a first dimming device 401, the first dimming device 401 is disposed between the first light source 101 and the beam splitter 2, and the first dimming device 401 may adjust a beam angle of the first light beam 1a emitted from the first light source 101. It can be understood that, if the second light beam 2a emitted from the second light source 102 is also deviated, the beam angle of the second light beam 2a can be adjusted by adjusting the position of the beam splitter 2. The first light modulation device 401 has a small volume, reduces the production cost, and can realize the adjustment of the beam angle of the first light beam 1a without changing the beam path of the emitted light beam, so the light source device provided by the application can ensure that the spot position of the light beam emitted by the first light source 101 and/or the second light source 102 is normal, and the position of the first light modulation device 401 is not required to be adjusted, and the first light beam 1a can be deflected towards different directions only by rotating the first light modulation device 401, so the operation is convenient.

It should be noted that, when the first light source 101, the second light source 102, the first dimming device 401, the beam splitter 2 and the wavelength conversion device 3 are arranged at the positions shown in fig. 11, the first dimming device 401 is still arranged between the first light source 101 and the beam splitter 2, and the beam angle of the first light beam 1a can be adjusted by the first dimming device 401.

In another example, as shown in fig. 11, the dimming component 4 may include a second dimming device 402, the second dimming device 402 is disposed between the second light source 102 and the beam splitter 2, and the second dimming device 402 is used for adjusting the beam angle of the second light beam emitted by the second light source 102. It can be understood that, if the first light beam 1a emitted from the first light adjusting device 401 also deviates, the beam angle of the first light beam 1a can be adjusted by adjusting the position of the beam splitter 2. The volume of second light modulation device 402 is less, and manufacturing cost is reduced, and need not change the light beam way of penetrating the light beam through increasing the speculum and can realize the regulation to the light beam angle of second light beam 2a, so, the light source device that this application provided can make the facula position that first light source 101 and/or second light source 102 penetrated the light beam normal, and need not adjust the position of second light modulation device 402, only need rotate second light modulation device 402 just can make second light beam 2a can deflect towards different directions, convenient operation.

In order to further improve the accuracy of adjusting the angle of the light beam, in an example, the dimming assembly 4 may include a first dimming device 401 and a second dimming device 402 as shown in fig. 12, and the setting positions of the first dimming device 401 and the second dimming device 402 are as described above, which is not described in detail herein. So, the light source device that this application provided can adjust two light sources, has satisfied the position requirement to two convergent faculas simultaneously, and convenient operation.

Optionally, the dimming devices (the first dimming device 401 and/or the second dimming device 402) in the dimming component 4 comprise at least one wedge-shaped lens, and when the dimming device comprises a plurality of wedge-shaped lenses, the plurality of wedge-shaped lenses are stacked.

In one example, the wedge-shaped lens may be a circular shape as shown in fig. 13, for example, the optical path of the first light beam 1a passing through the circular wedge-shaped lens is as shown in fig. 14, and when the first light beam 1a emitted by the first light source 101 is deviated, the circular wedge-shaped lens may be rotated so that the first light beam 1a may be deflected in different directions after passing through the circular wedge-shaped lens. When the dimming device includes a plurality of circular wedge lenses, the plurality of circular wedge lenses are stacked, for example, assuming that the first dimming device 401 includes two circular wedge lenses, and the angle of each circular wedge lens inclined plane is 2 ° (degree), stacking the two circular wedge lenses may result in a dimming device of 4 °, when the first light beam 1a emitted by the first light source 101 is deviated, the first light beam 1a may be adjusted by rotating the two circular wedge lenses, so that the accuracy of the first light beam 1a deflected after passing through the circular wedge lenses is improved.

In one example, the light source device further includes a first lens group 5 as shown in fig. 15, the first lens group 5 is disposed between the beam splitter 2 and the wavelength conversion device 3, and the first lens group 5 is used to focus and emit the first light beam to the wavelength conversion device 3. It should be noted that the first lens group 5 generally includes two lenses.

Alternatively, the first lens group 5 may be formed of glass.

In one example, the light source device may further include a second lens group 6 as shown in fig. 16, the second lens group 6 is disposed on a light path of the combined third light beam 3a and the second light beam 2a, and the second lens group 6 is configured to focus the third light beam 3a and the second light beam 2a and emit the light source device into the optical engine aperture 701. It should be noted that the second lens group 6 focuses the third light beam 3a and the second light beam 2a together and then emits the light beam from the light source device, so that the color of the light beam finally emitted from the light source device is better.

Alternatively, the second lens group 6 may include at least one lens.

The light source device that this application embodiment provided can adjust two light sources through adjusting luminance subassembly 4, satisfied the position requirement to two convergent faculas simultaneously, adjust luminance the volume of device less in the subassembly 4 of adjusting luminance, production cost is reduced, and need not change the light beam way of penetrating out the light beam through increasing the speculum and can realize the regulation to the light beam angle of first light beam 1a and/or second light beam 2a, when adjusting, only need just can make first light beam 1a and/or second light beam 2a deflect towards different directions through rotating the device of adjusting luminance, and convenient for operation has guaranteed the projection effect of the projection system who uses this light source device.

Example two

A second embodiment of the present application provides a projection system, which includes the light source device described in any optional manner of the first embodiment, and the projection system is configured to emit a light beam emitted from the light source device to a projection device such as a projection curtain.

In one example, the projection system may further include an optical engine 7 as shown in fig. 17, an optical engine aperture 701 is disposed on the optical engine 7, and the second light beam 2a and the third light beam 3a are converged into a light spot and then incident into the optical engine aperture 701.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A light source device, characterized in that the light source device comprises: the device comprises a light source (1), a spectroscope (2) and a wavelength conversion device (3), wherein the light source (1) comprises a first light source (101) and a second light source (102);

the spectroscope (2) is used for emitting a first light beam emitted by the first light source (101) to the wavelength conversion device (3) and emitting a second light beam emitted by the second light source (102) out of the light source device; the wavelength conversion device (3) is used for converting the received first light beam into a third light beam and emitting the third light beam out of the light source device;

the light source device further comprises a dimming component (4), the dimming component (4) is arranged between the spectroscope (2) and the light source (1), and the dimming component (4) is used for adjusting the light beam angle of the first light beam and/or the second light beam.

2. The light source device according to claim 1, wherein the dimming assembly (4) comprises a first dimming device (401), the first dimming device (401) is arranged between the first light source (101) and the beam splitter (2), and the first dimming device (401) is used for adjusting the beam angle of the first light beam emitted by the first light source (101).

3. A light source device according to claim 1, characterized in that the dimming component (4) comprises a first dimming device (401) and a second dimming device (402);

the first dimming device (401) is arranged between the first light source (101) and the spectroscope (2), and the first dimming device (401) is used for adjusting the beam angle of the first light beam emitted by the first light source (101); the second dimming device (402) is arranged between the second light source (102) and the beam splitter (2), and the second dimming device (402) is used for adjusting the beam angle of the second light beam emitted by the second light source (102).

4. The light source device according to claim 1, wherein the dimming component (4) comprises a second dimming device (402), the second dimming device (402) being arranged between the second light source (102) and the beam splitter (2), the second dimming device (402) being configured to adjust a beam angle of the second light beam emitted by the second light source (102).

5. The light source device according to any one of claims 2-4, wherein the light modulating device in the light modulating assembly comprises at least one wedge-shaped lens, and when the light modulating device comprises a plurality of wedge-shaped lenses, a plurality of wedge-shaped lenses are stacked.

6. The light source device of claim 5, wherein the wedge-shaped lens is circular.

7. The light source device according to claim 5, further comprising a first lens group (5), wherein the first lens group (5) comprises two lenses;

the first lens group (5) is arranged between the beam splitter (2) and the wavelength conversion device (3), and the first lens group (5) is used for focusing and emitting the first light beam to the wavelength conversion device (3).

8. The light source device according to claim 7, wherein the lens group (5) further comprises a second lens group (6), the second lens group (6) comprising at least one lens;

the second lens group (6) is disposed on a light path where the third light beam and the second light beam are combined, and the second lens group (6) is configured to focus the third light beam and the second light beam and emit the light source device.

9. A projection system, characterized in that the projection system comprises a light source device as claimed in any one of claims 1 to 8.

10. The projection system of claim 9, further comprising a light engine (7), wherein the light engine (7) is provided with a light engine aperture (701), and the second light beam and the third light beam are converged into a light spot and then incident into the light engine aperture (701).

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