CN113507597A - Projector optical device and projector - Google Patents

Abstract

The embodiment of the invention provides an optical device of a projector and the projector, and relates to the field of projectors. The projector optics include a first polarizing beamsplitter, a first Lcos component, a second Lcos component, and a second polarizing beamsplitter. The first polarizing beam splitter is used for receiving the light emitted by the light source and splitting the light into a first light and a second light which are perpendicular to each other. The first Lcos component is arranged on a light path of the first light ray so as to convert the first light ray into a first image light ray and project the first image light ray on the second polarizing beam splitter. The second Lcos component is disposed on the light path where the second light is located, so that the second light is converted into a second image light, and the second image light is projected onto the second polarization beam splitter. The second polarizing beam splitter is used for combining the first image light and the second image light to form composite image light. The light energy utilization rate is improved, and the display brightness is enhanced.

Description

Projector optical device and projector

Technical Field

The invention relates to the field of projection display systems, in particular to an optical device of a projector and the projector.

Background

For a long time, projectors are usually classified based on the characteristics of a Light valve, which is one of the most core devices of the projector, such as a DLP (Digital Light Processing) projector, an LCD (Liquid Crystal Display) projector, an LCOS (Liquid Crystal on Silicon) projector, and the like.

In the prior art, in order to pursue a large screen of the projector, the display effect of high brightness is usually changed by increasing the power of the illumination light source, however, the heat productivity of the projector is increased and the light energy utilization rate is reduced.

Disclosure of Invention

The invention aims to provide a projector optical device and a projector system, which can improve the utilization rate of light energy so as to improve the display brightness of a projector.

Embodiments of the invention may be implemented as follows:

in a first aspect, the present invention provides an optical device for a projector, comprising a first polarizing beam splitter, a first Lcos component, a second Lcos component and a second polarizing beam splitter; the first polarization spectroscope is used for receiving light rays emitted by a light source and decomposing the light rays into first light rays and second light rays which are perpendicular to each other, wherein one of the first light rays and the second light rays is P-pole composite light rays, and the other one of the first light rays and the second light rays is S-pole composite light rays; the first Lcos component is arranged on the light path of the first light ray, so that the first light ray is converted into a first image light ray, and the first image light ray is projected on the second polarization spectroscope; the second Lcos component is arranged on a light path where the second light ray is located, so that the second light ray is converted into a second image light ray, and the second image light ray is projected on the second polarization spectroscope; the second polarizing beam splitter is used for combining the first image light and the second image light to form composite image light.

In an alternative embodiment, the first Lcos assembly includes a third polarizing beamsplitter and a first Lcos device, and the second Lcos assembly includes a second Lcos device and a fourth polarizing beamsplitter; the third polarizing beam splitter is arranged in the emitting direction of the first light, the first Lcos device is arranged in the emitting direction of the first light of the third polarizing beam splitter, the third polarizing beam splitter is used for receiving the first light and projecting the first light to the first Lcos device, and the first Lcos device converts the first light into the first image light and projects the first image light to the second polarizing beam splitter through the third polarizing beam splitter; the fourth polarizing beam splitter is arranged in the emitting direction of the second light, the second Lcos device is arranged in the emitting direction of the second light of the fourth polarizing beam splitter, the fourth polarizing beam splitter is used for receiving the second light and projecting the second light to the second Lcos device, and the second Lcos device converts the second light into second image light and projects the second image light to the second polarizing beam splitter through the fourth polarizing beam splitter.

In an alternative embodiment, said first Lcos module includes a first filter to match said first light, and said second Lcos module includes a second filter to match said second light; the first filter element is disposed between the first PBS and the third PBS, and the first filter element is configured to filter the first light; the second filter is disposed between the first pbs and the fourth pbs, and the second filter is configured to filter the second light.

In an alternative embodiment, the first Lcos module includes a third filter to match the first image light, and the second Lcos module includes a fourth filter to match the second image light; the third filter element is disposed between the third pbs and the second pbs, and is configured to filter the first image light; the fourth filter is disposed between the fourth pbs and the second pbs, and is configured to filter the second image light.

In an alternative embodiment, the first, second, third, and fourth filter elements are reflective monopolar optical filter membranes.

In an optional embodiment, the projector optical device includes an optical spot adapter, disposed in a light incident direction of the first pbs, for receiving the light from the light source and transmitting the light to the first pbs after being configured with the first Lcos device and the second Lcos device.

In an alternative embodiment, the projector optics comprise a light source arranged in the light incidence direction of the spot adapter.

In an optional embodiment, an optical path length from the first light ray to the first Lcos device is equal to an optical path length from the second light ray to the second Lcos device, and an optical path length from the first image light ray to the second polarization beam splitter is equal to an optical path length from the second image light ray to the second polarization beam splitter.

In an optional embodiment, the optical device of the projector includes a field lens and an imaging lens, the field lens is disposed in the exit direction of the second pbs, the imaging lens is disposed in the light exit direction of the field lens, and the field lens is configured to receive the composite image light, so that the composite image light matches the imaging lens.

In a second aspect, the present invention provides a projector comprising a housing and the projector optical device of any of the preceding embodiments, the projector optical device being mounted within the housing.

The optical device of the optical energy projector and the projector provided by the embodiment of the invention have the beneficial effects that:

the light of the light source is decomposed into the first light and the second light which are perpendicular to each other by the first polarizing spectroscope, the first Lcos component is arranged on the light path of the first light, the first light is converted into the first image light by the first Lcos component and is projected on the second polarizing spectroscope, the second Lcos component is arranged on the light path of the second light, the second light is converted into the second image light by the second Lcos component and is projected on the second polarizing spectroscope, and finally the first image light and the second image light are synthesized by the second polarizing spectroscope to form a composite image, so that the first light and the second light passing through the first polarizing spectroscope are effectively utilized, the light energy utilization rate is improved, and the display brightness is enhanced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a projector according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an optical device of a projector according to an embodiment of the present invention;

fig. 3 is a timing chart illustrating control of the first Lcos device and the second Lcos device in one display period of the optical apparatus of the projector according to the embodiment of the present invention.

Icon: 100-projector optics; 110-a first polarizing beamsplitter; 130-a first Lcos component; 131-a third polarizing beamsplitter; 133-a first Lcos device; 135-a first filter element; 137-a third filter; 150-a second Lcos component; 151-second Lcos device; 153-fourth polarizing beamsplitter; 155-a second filter element; 157-a fourth filter element; 170-a second polarizing beamsplitter; 190-spot adapter; 210-a light source; 230-field lens; 250-an imaging lens; 300-a projector; 310-a housing; 311-mounting holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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 invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1, the present embodiment provides a projector 300, which can improve the utilization rate of light energy of a light source, so that the display brightness of the projector 300 is enhanced.

The projector 300 includes a housing 310 and a projector optical device 100, the projector optical device 100 being mounted in the housing 310, the projector optical device 100 being configured to provide a projection image light.

In this embodiment, the projector 300 further includes a screen (not shown) for the projector optics 100 to project and display images.

As shown in fig. 2, in the present embodiment, the projector optical device 100 includes a first pbs 110, a first Lcos component 130, a second Lcos component 150, and a second pbs 170. The first pbs 110 is used for receiving the light emitted by the light source 210 and splitting the light into a first light and a second light perpendicular to each other, wherein one of the first light and the second light is a P-pole composite light, and the other is an S-pole composite light. The first Lcos component 130 is disposed on the optical path of the first light, so that the first light is converted into a first image light, and the first image light is projected onto the second pbs 170. The second Lcos assembly 150 is disposed on the optical path of the second light, so that the second light is converted into a second image light, and the second image light is projected onto the second pbs 170. The second pbs 170 is used to combine the first image light and the second image light to form a composite image.

It should be noted that the first pbs 110 is an optical element that uses the property that when light is incident at the brewster angle, the P-polarization transmittance is 1 and the S-polarization transmittance is less than 1, so as to completely transmit the P-polarization component and reflect most of the S-polarization component. Since the light has a particle-dichroism property, when the light generated by the light source 210 passes through the first pbs 110, the first pbs 110 can make the p-polar light pass through the first pbs 110, and the S-polar light cannot pass through the first pbs 110 and is reflected, so that the light of the light source 210 is split into a first light and a second light which are perpendicular to each other. Since the light source 210 is a composite light source 210. The light of the composite light source 210 includes light of three primary colors of red, green and blue, so that the first light and the second light, which are decomposed by the first beam splitter, both include the three primary colors of red, green and blue. Therefore, the decomposed S-pole composite light includes green primary light of the S-pole, red primary light of the S-pole, and blue primary light of the S-pole, and the decomposed P-pole composite light includes green primary light of the P-pole, red primary light of the P-pole, and blue primary light of the P-pole. The first Lcos component 130 and the second Lcos component 150 modulate the first image into the first image light with image information and the second image information based on the data image information. Due to the transparency and reflectivity of the second pbs 170, the first image light and the second image light projected in different directions of the second pbs 170 are combined and superimposed on the exit surface of the second pbs 170 to obtain the full image light.

In this embodiment, the first polarizing beam splitter 110 is arranged to split the light of the light source 210 into the first light and the second light which are perpendicular to each other, the first Lcos component 130 is arranged on the light path where the first light is located, the first light is converted into the first image light by the first Lcos component 130 and is projected onto the second polarizing beam splitter 170, the second Lcos component 150 is arranged on the light path where the second light is located, the second light is converted into the second image light by the second Lcos component 150 and is projected onto the second polarizing beam splitter 170, and finally the first image light and the second image light are synthesized by the second polarizing beam splitter 170 to form a composite image, so that the first light and the second light passing through the light of the first polarizing beam splitter 110 are both effectively utilized, the light energy utilization rate is improved, and the display brightness is enhanced.

As shown in fig. 2, in the present embodiment, the first light is a P-pole composite light, and the second light is an S-pole composite light.

In this embodiment, the first Lcos assembly 130 includes a third polarizing beam splitter 131 and a first Lcos device 133. The second Lcos assembly 150 includes a second Lcos device 151 and a fourth polarizing beam splitter 153. The third pbs 131 is disposed at a side of the first pbs 110 where the first light exits, the first Lcos device 133 is disposed at a side of the third pbs 131 where the first light exits, and the third pbs 131 enables the first light passing through the first pbs 110 to pass through the third pbs 131 and be projected to the first Lcos device 133. The first Lcos device 133 converts the first light into a first image light, and reflects the first image light to the third pbs 131, and the first image light is reflected to the second pbs 170 by the third pbs 131. The fourth pbs 153 is disposed at one side of the exit direction of the second light reflected by the first pbs 110. The second Lcos device 151 is disposed at one side of the fourth pbs 153 in the reflection direction of the second light. The second light reflected by the first pbs 110 is reflected by the fourth pbs 153 and then projected onto the second Lcos device 151. The second Lcos device 151 converts the second light into a second image light, and reflects the second image light to the fourth pbs 153. The second image light passes through the fourth pbs 153 and is projected onto the second pbs 170, so that the second image light passes through the second pbs 170 and exits from the same side of the second pbs 170 as the first image light, thereby realizing the combination of the first image light and the second image light.

It should be noted that: since the first Lcos device 133 and the second Lcos device 151 are also called liquid crystal on silicon. The first Lcos device 133 and the second Lcos device 151 each include a glass substrate, a liquid crystal layer, and a silicon layer in this order, a mirror is formed on the surface of the silicon layer, and first light rays incident from the front of the first Lcos device 133 pass through the liquid crystal layer to change pixel brightness and rotate polarization direction, so as to form first image light rays. The first image light is transmitted to the surface of the silicon substrate through the liquid crystal layer, and is reflected by the reflecting mirror of the silicon substrate to be emitted from the front surface of the first Lcos device 133. Since the polarization direction of the first light is changed by the modulation of the liquid crystal layer, the emitted first image light is S-polar light, and thus the first image light cannot pass through the third pbs 131 when being projected to the third pbs 131, so that the first image light is reflected by the third pbs 131 to the second pbs 170. The second light incident from the front of the second Lcos device 151 passes through the liquid crystal layer to change the pixel brightness and rotate the polarization direction, thereby forming a second image light. The second image light is transmitted to the surface of the silicon substrate through the liquid crystal layer, and is reflected by the reflecting mirror of the silicon substrate to be emitted from the front surface of the second Lcos device 151. Since the polarization direction of the second light is changed by the modulation of the liquid crystal layer, the emitted second image light is P-pole light, and when the second light is projected to the fourth pbs 153, the second light passes through the fourth pbs 153, is projected to the second pbs 170, and passes through the second pbs 170 to be combined with the first image light.

The S-pole composite light of the first light may be further filtered by passing the first light through the first pbs 110 and the third pbs 131, and the S-pole light of the second image may be further filtered by passing the second image light through the second pbs 170 and the fourth pbs 153, so that the parasitic light is removed and the contrast of the display is improved.

Referring to fig. 3, fig. 3 is a timing chart illustrating control of the first Lcos device 133 and the second Lcos device 151 in one display period of the projector optical device 100 according to the embodiment of the present invention. The display brightness of the projector 300 in one display period is the superposition of the brightness of the first image light emitted by the first Lcos device 133 and the brightness of the second image light emitted by the second Lcos device 151, so that the utilization rate of light energy is improved, and the display brightness of the projector 300 is enhanced.

In some other embodiments of the present application, the first light is an S-pole composite light, and the second light is a P-pole composite light. When the first light is S-pole composite light and the second light is P-pole composite light, only the positions of the first Lcos device 133 and the second Lcos device 151 need to be changed so that the first Lcos device 133 can receive the first light reflected by the third pbs 131 and the second Lcos device 151 can receive the second light passing through the fourth pbs 153.

In some embodiments of the present application, the first Lcos device 133 and the second Lcos device 151 may also be replaced with DCOs devices.

As shown in fig. 2, in the present embodiment, the first PBS 110, the second PBS 170, the third PBS 131 and the fourth PBS 153 are all PBS prisms. In other embodiments of the present application, the first pbs 110, the second pbs 170, the third pbs 131, and the fourth pbs 153 can also be polarizing dichroic dielectric films. Or one part of the first PBS 110, the second PBS 170, the third PBS 131 and the fourth PBS 153 is a PBS prism, and the other part is a polarization splitting medium film.

In this embodiment, the optical path length from the first light to the first Lcos device 133 is equal to the optical path length from the second light to the second Lcos device 151, and the optical path length from the first image light to the second polarization beam splitter 170 is equal to the optical path length from the second image light to the second polarization beam splitter 170. By making the optical lengths of the first light and the second light equal, the first Lcos device 133 and the second Lcos device 151 can receive the same light with image information at the same time, so that the first image light and the second image light converted by the first Lcos device 133 and the second Lcos device 151 are synchronized. The optical lengths of the first image light and the second image light are equal, so that the first image light and the second image light of the same picture are combined by the second polarization beam splitter 170.

In this embodiment, the first Lcos assembly 130 includes a first filter 135 for matching the first light and the second Lcos assembly 150 includes a second filter 155 for matching the second light. The first filter 135 is disposed between the first pbs 110 and the third pbs 131, and the first filter 135 is used for filtering the first light. The second filter 155 is disposed between the first pbs 110 and the fourth pbs 153, and the second filter 155 is used for filtering the second light.

The first light and the second light are filtered by the first filter piece 135 and the second filter piece 155, so that the light beams entering the first Lcos device 133 and the second Lcos device 151 are purer, and the contrast of the image can be improved.

It should be noted that the matching of the first filter 135 with the first light ray means that the first filter 135 can pass P-pole light and block S-pole light. The matching of the second filter 155 with the second light means that the second filter 155 can pass the S-pole light and block the P-pole light.

As shown in fig. 2, in the present embodiment, the first Lcos assembly 130 includes a third filter 137 that matches the first image light. The second Lcos assembly 150 includes a fourth filter 157 that matches the second image light. The third filter 137 is disposed between the third pbs 131 and the second pbs 170, and is used for filtering the first image light. The fourth filter 157 is disposed between the fourth pbs 153 and the second pbs 170, and is used for filtering the second image light.

By providing the third filter 137 and the fourth filter 157 to filter the first image light and the second image light, the light beam projected to the second polarization beam splitter 170 can be made purer, and the contrast of the displayed image can be improved.

It should be noted that the matching of the third filter 137 with the first image light means that the third filter 137 can pass the S-pole light and block the P-pole light. The fourth filter 157 matches the second image light, which means that the fourth filter 157 can pass P-pole light and block S-pole light.

In this embodiment, the first filter member 135, the second filter member 155, the third filter member 137, and the fourth filter member 157 are all reflective monopolar optical filter membranes. The reflective monopolar optical filter membrane may reflect the filtered light beam to reduce the generation of heat in the first, second, third, and fourth filter elements 135, 155, 137, and 157. Meanwhile, the reflective monopole light can filter P-pole light or S-pole light by changing the angle of the reflective monopole light, so that the use is more convenient.

As shown in fig. 2, in the present embodiment, the projector optical device 100 further includes an optical spot adapter 190, and the optical spot adapter 190 is disposed in the light incident direction of the first pbs 110, and is used for receiving the light from the light source 210, and emitting the light to the first pbs 110 after being matched with the first Lcos device 133 and the second Lcos device 151. The light spot adapter 190 can convert the light of the light source 210 into parallel light, so that the utilization rate of light energy can be improved. Meanwhile, the light spot adapter 190 can also adjust the size of the light source 210 to be matched with the first Lcos device 133 and the second Lcos device 151, so that more first light and second light can enter the first Lcos device 133 and the second Lcos device 151 to improve the utilization rate of light energy.

In the present embodiment, the light spot adapter 190 is an aspheric light guide mirror. In other embodiments of the present application, the spot adapter 190 may also be a light guide.

In the present embodiment, the projector optical device 100 includes a light source 210, and the light source 210 is disposed in the light incident direction of the flare adapter 190. The light emitted by the light source 210 is collimated light.

In the present embodiment, the projector optical apparatus 100 includes a field lens 230 and an imaging lens 250. The field lens 230 is disposed in the exit direction of the second pbs 170. The imaging lens 250 is disposed in the light exiting direction of the field lens 230, and the field lens 230 is configured to receive the composite image light, so that the composite image light matches the imaging lens 250, and the composite image light is projected on the display device through the imaging lens 250.

As shown in fig. 2, in the present embodiment, a mounting hole 311 is formed in the housing 310, and the imaging lens 250 is mounted in the mounting hole 311 so that an image can be projected on the display device.

The working principle and the beneficial effects of the projector optical device 100 and the projector 300 provided by the embodiment include:

the light of the light source 210 is decomposed into the first light and the second light which are perpendicular to each other by the first polarization spectroscope 110, the first Lcos component 130 is arranged on the light path of the first light, the first light is converted into the first image light by the first Lcos component 130 and is projected on the second polarization spectroscope 170, the second Lcos component 150 is arranged on the light path of the second light, the second light is converted into the second image light by the second Lcos component 150 and is projected on the second polarization spectroscope 170, and finally the first image light and the second image light are synthesized by the second polarization spectroscope 170 to form a composite image, so that the first light and the second light which pass through the light of the first polarization spectroscope 110 are effectively utilized, the light energy utilization rate is improved, and the display brightness is enhanced.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An optical device of a projector is characterized by comprising a first polarized beam splitter, a first Lcos component, a second Lcos component and a second polarized beam splitter;

the first polarization spectroscope is used for receiving light rays emitted by a light source and decomposing the light rays into first light rays and second light rays which are perpendicular to each other, wherein one of the first light rays and the second light rays is P-pole composite light rays, and the other one of the first light rays and the second light rays is S-pole composite light rays;

the first Lcos component is arranged on the light path of the first light ray, so that the first light ray is converted into a first image light ray, and the first image light ray is projected on the second polarization spectroscope;

the second Lcos component is arranged on a light path where the second light ray is located, so that the second light ray is converted into a second image light ray, and the second image light ray is projected on the second polarization spectroscope;

the second polarizing beam splitter is used for combining the first image light and the second image light to form composite image light.

2. The projector optical device of claim 1 wherein said first Lcos assembly includes a third polarizing beamsplitter and a first Lcos device, and said second Lcos assembly includes a second Lcos device and a fourth polarizing beamsplitter;

the third polarizing beam splitter is arranged in the emitting direction of the first light, the first Lcos device is arranged in the emitting direction of the first light of the third polarizing beam splitter, the third polarizing beam splitter is used for receiving the first light and projecting the first light to the first Lcos device, and the first Lcos device converts the first light into the first image light and projects the first image light to the second polarizing beam splitter through the third polarizing beam splitter;

the fourth polarizing beam splitter is arranged in the emitting direction of the second light, the second Lcos device is arranged in the emitting direction of the second light of the fourth polarizing beam splitter, the fourth polarizing beam splitter is used for receiving the second light and projecting the second light to the second Lcos device, and the second Lcos device converts the second light into second image light and projects the second image light to the second polarizing beam splitter through the fourth polarizing beam splitter.

3. The projector optical device of claim 2 wherein said first Lcos module includes a first filter element matched to said first light ray and said second Lcos module includes a second filter element matched to said second light ray;

the first filter element is disposed between the first PBS and the third PBS, and the first filter element is configured to filter the first light;

the second filter is disposed between the first pbs and the fourth pbs, and the second filter is configured to filter the second light.

4. The projector optical device of claim 3 wherein said first Lcos module includes a third filter element for matching said first image light, and said second Lcos module includes a fourth filter element for matching said second image light;

the third filter element is disposed between the third pbs and the second pbs, and is configured to filter the first image light;

the fourth filter is disposed between the fourth pbs and the second pbs, and is configured to filter the second image light.

5. The projector optical device of claim 4 wherein said first filter, said second filter, said third filter, and said fourth filter are reflective monopole optical filter membranes.

6. The optical device as claimed in claim 2, wherein said optical device comprises an optical spot adapter disposed on a light incident direction of said first pbs for receiving said light from the light source and transmitting said light to said first pbs after being configured with said first Lcos device and said second Lcos device.

7. The projector optics of claim 6 wherein said projector optics includes a light source disposed in the direction of light incidence of said flare adapter.

8. The projector optical device as defined in claim 2 wherein the optical path length of said first light to said first Lcos device is equal to the optical path length of said second light to said second Lcos device, and the optical path length of said first image light to said second polarizing beamsplitter is equal to the optical path length of said second image light to said second polarizing beamsplitter.

9. The optical device as claimed in claim 1, wherein the optical device includes a field lens and an imaging lens, the field lens is disposed in the exit direction of the second pbs, the imaging lens is disposed in the light exit direction of the field lens, and the field lens is configured to receive the composite image light, so that the composite image light matches the imaging lens.

10. A projector comprising a housing and the projector optics of any of claims 1-9 mounted within the housing.

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