CN209895095U - Polarization beam splitter prism and 3D projection light modulation system - Google Patents
Polarization beam splitter prism and 3D projection light modulation system Download PDFInfo
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- CN209895095U CN209895095U CN201920434903.9U CN201920434903U CN209895095U CN 209895095 U CN209895095 U CN 209895095U CN 201920434903 U CN201920434903 U CN 201920434903U CN 209895095 U CN209895095 U CN 209895095U
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Abstract
The utility model is suitable for a 3D projection technology field, the utility model provides a polarization beam splitter prism, this polarization beam splitter prism adopts several prism laminating, and plated polarization beam splitter film and polarization rotating film on the prism respectively, wherein first polarization beam splitter film pastes with first polarization rotating film mutually, second polarization beam splitter film pastes with second polarization rotating film mutually, because the polarization beam splitter film that plates on the prism all is very thin with polarization rotating film, and the optical refractive index of all prisms is the same, consequently, the projection light beam can not take place the refraction phenomenon basically through whole polarization beam splitter prism, the luminance of projecting each region on the metal curtain is just more even, thereby the condition that the middle zone of having avoided the metal curtain darkens relatively.
Description
Technical Field
The utility model belongs to the technical field of the 3D projection, especially, relate to a polarization beam splitter prism and 3D projection light modulation system.
Background
The viewing principle of stereo image is that the left and right eyes of human respectively receive the video images of left and right eyes which are played according to the frame sequence, and then the video images of left and right eyes are synthesized by brain to generate stereo effect.
The current technologies for receiving images by left and right eyes mainly include a left and right polarization beam splitting method, a left and right shutter switch synchronization method, a left and right red and blue beam splitting method, and the like, and the left and right polarization beam splitting method is widely used. In the left and right polarization beam splitting modes, a single-light path polarization beam splitting technology and a double-light path polarization beam splitting technology are generated in sequence according to the technical development track.
Since the modulation system using the dual optical path polarization beam splitting has a large size and a large number of optical devices, and there are many difficulties in processing and assembling the devices, a three optical path polarization beam splitting technology is developed on the basis of the dual optical path, as shown in fig. 1A, the beam splitting device includes a first beam splitting plate 11 and a second beam splitting plate 12, one end of the first beam splitting plate 11 and one end of the second beam splitting plate 12 are connected and inclined to different directions, respectively, and are substantially at a right angle, a first polarization beam splitting layer 111 is attached to a side of the first beam splitting plate 11 facing the projection beam, a first polarization beam splitting layer 121 is attached to a side of the second beam splitting plate 12 facing the projection beam, an upper half portion of the projection beam is split into transmitted P-polarized light and reflected S-polarized light by the first polarization beam splitting layer 111, a lower half portion of the projection beam is split into transmitted P-polarized light and reflected S-polarized light by the second polarization beam splitting layer 121, the light source is generally represented by an upper half beam of S polarized light, a lower half beam of S polarized light and a middle beam of P polarized light, and the three beams of light are subjected to phase modulation respectively and then projected onto the metal curtain.
The first light-splitting plate 11 and the second light-splitting plate 12 in fig. 1A have a certain thickness, and fig. 1B shows a path of a light beam transmitted through the first light-splitting plate 11 and the second light-splitting plate 12. As shown in fig. 1B, the projection light beam having a diameter D incident on the first and second polarization splitting layers 111 and 121 is refracted as it is transmitted through the first and second light splitting plates 11 and 12. In this case, most of the transmitted P-polarized light is transmitted through the first light-splitting plate 11 and the second light-splitting plate 12, but the central light beam (light having a diameter d) enters the first light-splitting plate 11 and the second light-splitting plate 12 and then is converged into one point. Therefore, the light beam having the diameter d does not reach the metal curtain but disappears, in other words, the light is incident on the curved portion defined between the first light-splitting plate 11 and the second light-splitting plate 12 and then is converged to a point to form a Dark Area (DA). At this time, the energy of the projection beam is reduced, and the luminous intensity on the metal curtain is reduced, so that the middle area of the metal curtain is relatively darkened.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a three light path polarization beam splitting prisms that aim at solving 3D projection system are because the beam splitter has certain thickness, lead to the problem that the middle zone of throwing on the metal curtain darkens.
In order to solve the above technical problem, the first aspect of the present invention provides a wide-angle polarization splitting prism, include: the first prism is provided with a first polarization beam splitting film plated on a first light emitting surface; the first polarization beam splitting film is used for splitting the upper half part of the projection beam into a first reflected beam with a first polarization state and a first transmitted beam with a second polarization state; the first light-emitting surface of the first prism is plated with a first polarization beam splitting film; the second polarization beam splitting film is used for splitting the lower half part of the projection light beam into a second reflected light beam with a first polarization state and a second transmitted light beam with a second polarization state; the first light incident surface of the third prism is plated with a first polarization rotating film, and the second light incident surface of the third prism is plated with a second polarization rotating film; the first polarization rotating film is adhered to the first polarization splitting film and used for converting the first transmission beam from the second polarization state to the first polarization state; the second polarization rotating film is adhered to the second polarization splitting film and used for converting the second transmission beam from a second polarization state to a first polarization state; the first polarization state is orthogonal to the second polarization state; the optical refractive indexes of the first prism, the second prism and the third prism are the same.
Further, the first polarization rotating film and the first polarization light splitting film are adhered by adopting optical glue; and the second polarization rotating film and the second polarization light splitting film are adhered by adopting optical glue.
Furthermore, the first prism, the second prism and the third prism are cuboid after being attached.
Further, the polarization splitting prism further includes: the front alignment assembly is provided with a light inlet surface and a light outlet surface, and the light outlet surface is adhered to the light inlet surface of the first prism and the light inlet surface of the second prism. Pre-alignment assembly pre-alignment assembly
Furthermore, the first polarization rotating film and the first polarization beam splitting film are adhered by using an optical adhesive; the second polarization rotating film and the second polarization light splitting film are adhered by adopting optical glue; the first surface of the front alignment assembly is adhered to the second surface of the first prism through optical glue; and the second surface of the front alignment assembly and the second surface of the second prism are adhered by using optical glue.
Furthermore, the first prism, the second prism, the third prism and the front alignment assembly are in a cuboid shape after being attached.
Furthermore, the optical refractive indexes of the first prism, the second prism, the third prism and the front alignment assembly are the same.
Further, the front alignment assembly is a triangular prism or a quadrangular prism.
Further, a right angle is formed between the first polarization splitting film and the second polarization splitting film.
In a second aspect, the present invention further provides a 3D projection light modulation system, including:
the polarization splitting prism according to the first aspect;
the first light path direction adjusting component is used for adjusting the propagation direction of a first reflected light beam obtained by splitting the beam by the polarization splitting prism to be propagated towards the direction of the metal curtain;
the second light path direction adjusting component is used for adjusting the propagation direction of a second reflected light beam obtained by splitting the beam by the polarization splitting prism to be propagated towards the direction of the metal curtain;
the beam size adjusting component is used for adjusting the size range of the transmitted beam obtained by beam splitting of the polarization beam splitter prism;
and the polarization modulator assembly is used for modulating the first transmitted light beam, the second transmitted light beam, the first reflected light beam and the second reflected light beam into left circularly polarized light and right circularly polarized light according to the frame sequence.
The utility model provides a polarization beam splitter adopts the laminating of several prisms, and plated polarization beam splitting membrane and polarization rotating film on the prism respectively, first polarization beam splitting membrane wherein pastes with first polarization rotating film mutually, second polarization beam splitting membrane pastes with second polarization rotating film mutually, because polarization beam splitting membrane is all very thin with polarization rotating film, and the optical refractive index of all prisms is the same, consequently, the projection beam can not take place the refraction through whole polarization beam splitter prism basically and collect the phenomenon, the luminance of projecting each region on the metal curtain is just also more even, thereby the condition that the middle zone of having avoided the metal curtain darkens relatively.
Drawings
FIG. 1A is a schematic diagram of a prior art three-path optical splitting device;
fig. 1B is a light path diagram of the light beam transmitted through the first light-splitting plate 11 and the second light-splitting plate 12 in fig. 1A;
fig. 2A, fig. 2B and fig. 2C are an exploded view, a structural view and an optical path diagram of a polarization beam splitter prism according to a first embodiment of the present invention;
fig. 2D is a structural diagram of a modified polarization splitting prism according to a first embodiment of the present invention;
fig. 3 is a structural diagram of a polarization splitting prism according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the plating drawings and the examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 2A, fig. 2B and fig. 2C are respectively an exploded view, a structural diagram and an optical path diagram of the polarization splitting prism provided by the first embodiment of the present invention, referring to fig. 2A, fig. 2B and fig. 2C, the polarization splitting prism includes a first prism 21, a second prism 22 and a third prism 23, a first light-emitting surface of the first prism 21 is plated with a first polarization splitting film 211, and the first polarization splitting film 211 is used for splitting the upper half of the projection beam into a first reflected beam having a first polarization state and a first transmitted beam having a second polarization state. The first light-emitting surface of the second prism 22 is plated with a second polarization splitting film 221, the second polarization splitting film 221 is used for splitting the lower half portion of the projection light beam into a second reflected light beam having a first polarization state and a second transmitted light beam having a second polarization state, the first light-entering surface of the third prism 23 is plated with a first polarization rotating film 231, and the second light-entering surface is plated with a second polarization rotating film 232, wherein the first polarization rotating film 231 is adhered to the first polarization splitting film 211 for converting the first transmitted light beam from the second polarization state into the first polarization state, and the second polarization rotating film 232 is adhered to the second polarization splitting film 221 for converting the second transmitted light beam from the second polarization state into the first polarization state.
The first polarization state and the second polarization state are both linear polarization states and are orthogonal to each other, for example, the first polarization state is an S polarization state, and the second polarization state is a P polarization state. The first transmitted light beam enters the third prism 23 through the first polarization rotating film 231 and then exits from the light exit surface of the third prism 23, and the first reflected light beam enters the first prism 21 and exits from the second light exit surface of the first prism 21. Similarly, the second transmitted light beam enters the third prism 23 through the second polarization rotating film 232 and then exits from the light exit surface of the third prism 23, and the second reflected light beam enters the second prism 22 and exits from the second light exit surface of the second prism 22.
The first polarization beam splitting film 211, the second polarization beam splitting film 221, the first polarization rotating film 231 and the second polarization rotating film 232 are film layers coated on the prism surfaces of the first polarization beam splitting film, the second polarization beam splitting film 221, the first polarization rotating film 231 and the second polarization rotating film 232, and the thicknesses of the film layers are very thin, so that the refraction of the projection light beams in the coating layers is basically negligible. In general, the first polarization splitting film 211 and the second polarization splitting film 221 form a right angle therebetween.
The first prism 21, the second prism 22 and the third prism 23 have the same optical refractive index, so that the problem that the middle area projected on the metal curtain is darkened due to the refraction and convergence phenomenon when the projection light beam enters the third prism 23 from the first prism 21 and enters the third prism 23 from the second prism 22 can be avoided.
Further, the first polarization rotating film 231 and the first polarization splitting film 211 may be adhered by an optical adhesive, and the second polarization rotating film 232 and the second polarization splitting film 221 may also be adhered by an optical adhesive.
As shown in fig. 2B, the first prism 21, the second prism 22, and the third prism 23 are bonded to each other to form a rectangular parallelepiped, which has a regular shape and is easy to install.
It should be understood that the three prisms in fig. 2A, 2B, and 2C are shown in the shape of triangular prisms, and in the specific implementation, the first prism 21, the second prism 22, and the third prism 23 may be replaced by non-triangular prisms, as long as the regular shape after the fitting is ensured.
As can be seen from the above description, the polarization splitting prism provided in the first embodiment is formed by attaching several prisms, and the prisms are respectively coated with a polarization splitting film and a polarization rotating film, wherein the first polarization splitting film 211 is attached to the first polarization rotating film 231, and the second polarization splitting film 221 is attached to the second polarization rotating film 232.
Further, as shown in fig. 2D, the polarization splitting prism further includes a front alignment assembly 20 having a light incident surface and a light emergent surface, and the light emergent surface is adhered to the light incident surface of the first prism 21 and the light incident surface of the second prism 22. The front alignment assembly 20 is of a four-prism structure, and after the front alignment assembly 20 is attached to the first prism 21 and the second prism 22, the light incident surface of the first prism 21 and the light incident surface of the second prism 22 can be located on the same plane, so that the whole prisms are attached and aligned conveniently.
The optical refractive indexes of the first prism 21, the second prism 22, the third prism 23 and the front alignment assembly 20 are the same, and the first prism, the second prism, the third prism and the front alignment assembly are rectangular after being attached.
Fig. 3 shows a structure diagram of a polarization splitting prism provided by the second embodiment of the present invention, referring to fig. 3, the polarization splitting prism provided by the second embodiment includes a first prism 31, a second prism 32, a third prism 33, and a front alignment assembly 34, wherein, similar to the first embodiment, a first polarization splitting film is plated on a first surface of the first prism 31, a second polarization splitting film is plated on a first surface of the second prism 32, a first polarization rotating film is plated on a first surface of the third prism 33, a second polarization rotating film is plated on a second surface, the first polarization rotating film is pasted with the first polarization splitting film, and the second polarization rotating film is pasted with the second polarization splitting film. The function of each coating layer is the same as that of the first embodiment, and is not described again.
The front alignment assembly 30 has a light emitting surface and a light incident surface, and the light emitting surface is adhered to the light incident surface of the first prism 31 and the light incident surface of the second prism 32. The optical refractive indexes of the first prism 31, the second prism 32, the third prism 33 and the front alignment assembly 30 are the same.
After adding the fourth prism 34 to the light incident side of the first prism 31 and the second prism 32, the projection light beam can be made incident on a flat plane.
The utility model discloses the third embodiment still provides a 3D projection light modulation system, include:
the polarization beam splitter prism according to the first embodiment or the second embodiment is configured to perform polarization beam splitting on the projection light beam to obtain a first transmitted light beam, a first reflected light beam, a second transmitted light beam, and a second reflected light beam, where the first transmitted light beam and the second transmitted light beam can substantially propagate in a direction in which the metal curtain is located.
The first light path direction adjusting component is used for adjusting the propagation direction of a first reflected light beam obtained by splitting the beam by the polarization splitting prism to be propagated towards the direction of the metal curtain; and the second light path direction adjusting component is used for adjusting the propagation direction of a second reflected light beam obtained by splitting the beam by the polarization splitting prism to be propagated towards the direction of the metal curtain. The first light path direction adjusting assembly and the second light path direction adjusting assembly can be realized by selecting a reflecting mirror, and the reflecting angle of the reflecting mirror is adjustable and used for adjusting the positions of the first reflected light beam and the second reflected light beam for projecting images on the metal curtain.
And the beam size adjusting component is used for adjusting the size range of the transmitted beam obtained by beam splitting of the polarization beam splitter prism. After adjustment, the size of the spliced projection images of the first transmission light beam and the second projection light beam on the metal curtain is consistent with the size of the spliced projection images of the first reflection light beam and the second reflection light beam on the metal curtain. When the four beams of light are projected on the metal curtain, the image projected by the first transmission beam and the image projected by the second transmission beam are spliced to form a complete image, the image projected by the first reflection beam and the image projected by the second reflection beam are spliced to form a complete image, and then the sizes of the two complete images are adjusted to be consistent and the positions of the two complete images are overlapped.
Optionally, the device may further include a linear polarizer assembly for filtering and purifying the first transmitted light beam, the second transmitted light beam, the first reflected light beam, and the second reflected light beam, and may specifically be implemented by using a linear polarizer
The polarization modulator assembly is used for modulating the first transmitted light beam, the second transmitted light beam, the first reflected light beam and the second reflected light beam into left circularly polarized light and right circularly polarized light according to a frame sequence, and can be specifically realized by adopting a liquid crystal modulator.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A polarization splitting prism, comprising:
the first prism is provided with a first polarization beam splitting film plated on a first light emitting surface; the first polarization beam splitting film is used for splitting the upper half part of the projection beam into a first reflected beam with a first polarization state and a first transmitted beam with a second polarization state;
the first light-emitting surface of the first prism is plated with a first polarization beam splitting film; the second polarization beam splitting film is used for splitting the lower half part of the projection light beam into a second reflected light beam with a first polarization state and a second transmitted light beam with a second polarization state;
the first light incident surface of the third prism is plated with a first polarization rotating film, and the second light incident surface of the third prism is plated with a second polarization rotating film; the first polarization rotating film is adhered to the first polarization splitting film and used for converting the first transmission beam from the second polarization state to the first polarization state; the second polarization rotating film is adhered to the second polarization splitting film and used for converting the second transmission beam from a second polarization state to a first polarization state;
the first polarization state is orthogonal to the second polarization state; the optical refractive indexes of the first prism, the second prism and the third prism are the same.
2. The polarization splitting prism of claim 1, wherein the first polarization rotating film is adhered to the first polarization splitting film with an optical adhesive; and the second polarization rotating film and the second polarization light splitting film are adhered by adopting optical glue.
3. The polarization splitting prism of claim 1 or 2, wherein the first prism, the second prism, and the third prism are bonded to form a rectangular parallelepiped.
4. The polarization splitting prism of claim 1, further comprising:
the front alignment assembly is provided with a light inlet surface and a light outlet surface, and the light outlet surface is adhered to the light inlet surface of the first prism and the light inlet surface of the second prism.
5. The polarization splitting prism of claim 4, wherein the first polarization rotating film is adhered to the first polarization splitting film with an optical adhesive; the second polarization rotating film and the second polarization light splitting film are adhered by adopting optical glue; the first surface of the front alignment assembly is adhered to the second surface of the first prism through optical glue; and the second surface of the front alignment assembly and the second surface of the second prism are adhered by using optical glue.
6. The polarization splitting prism of claim 4 or 5, wherein the first prism, the second prism, the third prism, and the front alignment assembly are shaped as a rectangular parallelepiped after being attached.
7. The polarization splitting prism of claim 4 or 5, wherein the optical indices of the first prism, the second prism, the third prism, and the pre-alignment assembly are the same.
8. The polarization splitting prism of claim 4 or 5, wherein the pre-alignment assembly is a triangular prism or a quadrangular prism.
9. The polarization splitting prism of claim 1, wherein the first polarization splitting film is at a right angle to the second polarization splitting film.
10. A 3D projection light modulation system, comprising:
the polarization splitting prism of any one of claims 1 to 9;
the first light path direction adjusting component is used for adjusting the propagation direction of a first reflected light beam obtained by splitting the beam by the polarization splitting prism to be propagated towards the direction of the metal curtain;
the second light path direction adjusting component is used for adjusting the propagation direction of a second reflected light beam obtained by splitting the beam by the polarization splitting prism to be propagated towards the direction of the metal curtain;
the beam size adjusting component is used for adjusting the size range of the transmitted beam obtained by beam splitting of the polarization beam splitter prism;
and the polarization modulator assembly is used for modulating the first transmitted light beam, the second transmitted light beam, the first reflected light beam and the second reflected light beam into left circularly polarized light and right circularly polarized light according to the frame sequence.
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| CN201920434903.9U CN209895095U (en) | 2019-03-29 | 2019-03-29 | Polarization beam splitter prism and 3D projection light modulation system |
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| CN201920434903.9U CN209895095U (en) | 2019-03-29 | 2019-03-29 | Polarization beam splitter prism and 3D projection light modulation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112987149A (en) * | 2021-04-21 | 2021-06-18 | 广州立景创新科技有限公司 | Composite prism module and image acquisition module |
| CN112987151A (en) * | 2021-04-21 | 2021-06-18 | 广州立景创新科技有限公司 | Composite prism module, image acquisition module and assembly method of composite prism module |
| CN112987150A (en) * | 2021-04-21 | 2021-06-18 | 广州立景创新科技有限公司 | Composite prism module and image acquisition module |
| TWI786606B (en) * | 2021-04-21 | 2022-12-11 | 大陸商廣州立景創新科技有限公司 | Complex prism module and imaging apparatus |
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2019
- 2019-03-29 CN CN201920434903.9U patent/CN209895095U/en active Active
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| CN112987149A (en) * | 2021-04-21 | 2021-06-18 | 广州立景创新科技有限公司 | Composite prism module and image acquisition module |
| CN112987151A (en) * | 2021-04-21 | 2021-06-18 | 广州立景创新科技有限公司 | Composite prism module, image acquisition module and assembly method of composite prism module |
| CN112987150A (en) * | 2021-04-21 | 2021-06-18 | 广州立景创新科技有限公司 | Composite prism module and image acquisition module |
| US20220187512A1 (en) * | 2021-04-21 | 2022-06-16 | Guangzhou Luxvisions Innovation Technology Limited | Compound prism module and image acquisition module |
| US20220187513A1 (en) * | 2021-04-21 | 2022-06-16 | Guangzhou Luxvisions Innovation Technology Limited | Compound prism module and image acquisition module |
| TWI786606B (en) * | 2021-04-21 | 2022-12-11 | 大陸商廣州立景創新科技有限公司 | Complex prism module and imaging apparatus |
| CN112987149B (en) * | 2021-04-21 | 2023-01-20 | 广州立景创新科技有限公司 | Composite prism module and image acquisition module |
| US11846791B2 (en) * | 2021-04-21 | 2023-12-19 | Guangzhou Luxvisions Innovation Technology Limited | Compound prism module and image acquisition module |
| US11933996B2 (en) * | 2021-04-21 | 2024-03-19 | Guangzhou Luxvisions Innovation Technology Limited | Compound prism module and image acquisition module |
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