CN102929088A - Conduction-type polarizing and beam-splitting synchronized lighting device - Google Patents
Conduction-type polarizing and beam-splitting synchronized lighting device Download PDFInfo
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- CN102929088A CN102929088A CN2012104691480A CN201210469148A CN102929088A CN 102929088 A CN102929088 A CN 102929088A CN 2012104691480 A CN2012104691480 A CN 2012104691480A CN 201210469148 A CN201210469148 A CN 201210469148A CN 102929088 A CN102929088 A CN 102929088A
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Abstract
The invention provides a conduction-type polarizing and beam-splitting synchronized lighting device. The lighting device comprises a light source, a light guide stick, a polarizing and beam-splitting prism, a first lens, a polarized light conversion unit and a second lens, wherein light emitted by the light source is focused on the light guide stick; the incident face of the polarizing and beam-splitting prism is bonded with the exit face of the light guide stick; the polarizing and beam-splitting prism divides incident light into a first linearly polarized light and a second linearly polarized light; the first lens projects the first linearly polarized light to one of a plurality of first projectors; the polarized light conversion unit converts the polarization direction of the second linearly polarized light to be the same as that of the first linearly polarized light; and the second lens projects the second linearly polarized light of which the polarization direction is converted to one of a plurality of second projectors. The lighting device adopts the polarizing and beam-splitting prism to divide natural light of the light source into two paths of linearly polarized light, converts natural light into linearly polarized light while achieving beam-splitting, improves the light efficiency and lowers interference of parasitic light in the projectors.
Description
Technical field
The application relates to a kind of lighting device, relates in particular to the conduction-type polarization spectro synchronous illuminator for projector.
Background technology
The projector of the true three digit display of multi-projector becomes circumference to arrange, when flat screen forwards to over against projector projector project the figure in corresponding cross section, screen rotates continuously, human eye is looked and is persisted effect and will synthesize by the Series of Plane Section image of rotating shaft complete true 3-dimensional image, if reconstruct distortionless true 3-dimensional image, screen rotate should with projector's Complete Synchronization that throws light on.
A kind of placement scheme and multiple illumination path of multi-projector are disclosed in Chinese patent application CN101038421A, at least two projectors have wherein been used, around a rotary screen, put, with a two dimensional image synchronized projection of corresponding angle on a Rotation screen, thereby reconstruct the 3-D view similar to real-world object.Wherein have following problems, at first, the illumination light of employing is natural light, because at present LCD commonly used and the illumination of LCOS spatial light modulator requirement linearly polarized light, so the optical energy loss of synchronous lighting light path is larger; Secondly, pass light beam and projector and arrange one to one, quantity is a lot, and cost is higher; In addition, the incident end or the diaphragm that pass light beam are longer apart from the distance of rotating shaft, and generally between 300～800mm, the projection distance of lighting source is corresponding far away, and the bore of optical element is also corresponding larger, thereby have increased volume and the moment of inertia of rotation light path.
Summary of the invention
The present invention proposes a kind of conduction-type polarization spectro synchronous illuminator, can overcome defective described in the prior art.
This conduction-type polarization spectro synchronous illuminator comprises: light source, lamp guide, polarization splitting prism, the first camera lens, polarized light converting unit, the second camera lens; Wherein the light that sends of light source focuses on the lamp guide, the plane of incidence of polarization splitting prism and the exit facet of lamp guide are bonding, polarization splitting prism is divided into First Line polarized light and the second linearly polarized light with incident light, the first camera lens is projected in a plurality of the first projectors one with the First Line polarized light, the polarized light converting unit converts the polarization direction of the second linearly polarized light to identical with the polarization direction of First Line polarized light, and the second camera lens will be projected to through the second linearly polarized light of polarization direction conversion one in a plurality of the second projectors;
This device also comprises a rotating mechanism, described rotational structure drives light path system and rotates, make the linearly polarized light of the first camera lens and the second camera lens outgoing be projected to successively the first projector and the second projector, described light path system comprises light source, lamp guide, polarization splitting prism, the first camera lens, polarized light converting unit, the second camera lens.
Wherein, the cross sectional shape of lamp guide is circle, square or rectangle.
Wherein, the incident end face of lamp guide is shaped as circle.
Wherein, the outgoing end face of lamp guide is shaped as square or rectangle.
Wherein, the upper and lower bottom surface of polarization splitting prism all is polished optical surface, light at this optical surface place by total reflection.
Wherein, the polarization conversion unit is 1/2 wave plate.
Wherein, between polarization splitting prism and the first camera lens, have first and protect the local derviation optical wand.
Wherein, the second linearly polarized light is from being reflected prismatic reflection to the polarization conversion unit after the polarization splitting prism outgoing.
Wherein, between reflecting prism and polarization conversion unit, have second and protect the local derviation optical wand.
Beneficial effect of the present invention: in above-mentioned lighting device, adopt polarization splitting prism that the natural light of light source is divided into the two-route wire polarized light, in light splitting, realize the conversion of natural light to linearly polarized light, improved light efficiency, reduced the light disturbance in the projector.Simultaneously, adopt light-guiding type to pass the light mode and shortened the biography electrical distance in the projector, simple in structure, easy for installation, reduction cost also makes the lighting source homogenising simultaneously.
Description of drawings
Fig. 1 is the light path schematic diagram of polarized light synchronous illuminator of the present invention;
Fig. 2 is the structural representation of PBS prism of the present invention and reflecting prism;
Fig. 3 shows the relation between the lens axis and lamp guide center among the present invention.
Embodiment
Below, describe in detail according to a preferred embodiment of the invention by reference to the accompanying drawings.For convenience of description and highlight the present invention, omitted existing associated components in the prior art in the accompanying drawing, and will omit the description to these well-known components.
Figure 1 shows that the light path of conduction-type polarized light synchronous illuminator.Light source 1 is reflective cup type lighting source, also can adopt the lighting source of other type, the light that light source sends focuses on the lamp guide 2, the cross sectional shape of lamp guide can be circle, square and rectangle, perhaps also can adopt circular incident end, lamp guide, the outgoing end face of lamp guide and polarization splitting prism (PBS) 3 close contacts or bonding of square or rectangle exit end.PBS3 is divided into the mutually orthogonal linearly polarized light of two-way with natural light, and S direction linearly polarized light is through protecting local derviation optical wand 5, again through lens 6,7 and 8 pairs of projectors 9 of catoptron throw light on., through lamp guide 13 and 1/2 wave plate 14 and lens and catoptron projector 9 is thrown light on again through prism 4 reflection through the P of PBS3 transmission direction linearly polarized light.
The upper and lower bottom surface of PBS prism is generally uneven surface, and scattering is serious, can not total reflection, and the transfer efficiency of light is very low.Upper bottom surface with PBS3 in the present embodiment is polished to optical surface, makes light can carry out total reflection, thereby improves optical transmission efficiency, as shown in Figure 2.Be coated with total reflection film on the inclined-plane of the reflecting prism 4 in the present embodiment, upper bottom surface is polished to optical surface equally, makes the total reflection of light energy.1/2 wave plate 14 will be protected the P direction linearly polarized light that local derviation optical wand 13 sends and become S direction linearly polarized light, make the polarization direction of polarized light of two arm outgoing identical, be the desired polarization direction of projector.
The rotation of motor 12 is sent to rotating shaft 10 by gear 11, drives the synchronous lighting light path and rotates, and alternately projector is thrown light on.The height of all projectors and catoptron is all identical, and namely the lighting optical axis height of each projector is identical, and the beam center height of simultaneously two arm outgoing is also identical.Lens 6,7 optical axis exceed apart from a with respect to the center of lamp guide 5, make the center of outgoing beam move to the height identical with the projector lighting optical axis, as shown in Figure 3.Wherein a satisfies following formula (1):
Wherein D is for protecting the height of local derviation optical wand, f
1' be the focal length of lens 6, f
2' be the focal length of lens 7. Lens 15,16 optical axis relatively lamp guide 13 centers also use formula (1) to calculate to moving down one apart from a.Protect local derviation optical wand 5,13 geomeries identical, its cross sectional shape is square or rectangle.
Described in this instructions is several preferred embodiment of the present invention, and above embodiment is only in order to illustrate technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within the scope of the present invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. conduction-type polarization spectro synchronous illuminator comprises: light source, lamp guide, polarization splitting prism, the first camera lens, polarized light converting unit, the second camera lens; It is characterized in that: wherein the light that sends of light source focuses on the lamp guide, the plane of incidence of polarization splitting prism and the exit facet of lamp guide are bonding, polarization splitting prism is divided into First Line polarized light and the second linearly polarized light with incident light, the first camera lens is projected in a plurality of the first projectors one with the First Line polarized light, the polarized light converting unit converts the polarization direction of the second linearly polarized light to identical with the polarization direction of First Line polarized light, and the second camera lens will be projected to through the second linearly polarized light of polarization direction conversion one in a plurality of the second projectors.
2. conduction-type polarization spectro synchronous illuminator as claimed in claim 1, it is characterized in that: this device also comprises a rotating mechanism, described rotational structure drives light path system and rotates, make the linearly polarized light of the first camera lens and the second camera lens outgoing be projected to successively the first projector and the second projector, described light path system comprises light source, lamp guide, polarization splitting prism, the first camera lens, polarized light converting unit, the second camera lens.
3. conduction-type polarization spectro synchronous illuminator as claimed in claim 1 or 2 is characterized in that: wherein, the cross sectional shape of lamp guide is circular, square or rectangle.
4. conduction-type polarization spectro synchronous illuminator as claimed in claim 3, it is characterized in that: wherein, the incident end face of lamp guide is shaped as circle.
5. conduction-type polarization spectro synchronous illuminator as claimed in claim 3, it is characterized in that: wherein, the outgoing end face of lamp guide is shaped as square or rectangle.
6. such as claim 1 or 2 or 4 or 5 described conduction-type polarization spectro synchronous illuminators, it is characterized in that: wherein, the upper and lower bottom surface of polarization splitting prism all is polished optical surface, light at this optical surface place by total reflection.
7. such as claim 1 or 2 or 4 or 5 described conduction-type polarization spectro synchronous illuminators, it is characterized in that: wherein, the polarization conversion unit is 1/2 wave plate.
8. such as claim 1 or 2 or 4 or 5 described conduction-type polarization spectro synchronous illuminators, it is characterized in that: wherein, between polarization splitting prism and the first camera lens, have first and protect the local derviation optical wand.
9. such as claim 1 or 2 or 4 or 5 described conduction-type polarization spectro synchronous illuminators, it is characterized in that: wherein, between reflecting prism and polarization conversion unit, have second and protect the local derviation optical wand.
10. such as claim 1 or 2 or 4 or 5 described conduction-type polarization spectro synchronous illuminators, it is characterized in that: wherein, the second linearly polarized light is from being reflected prismatic reflection to the polarization conversion unit after the polarization splitting prism outgoing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210469148.0A CN102929088B (en) | 2012-11-19 | 2012-11-19 | Conduction-type polarizing and beam-splitting synchronized lighting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210469148.0A CN102929088B (en) | 2012-11-19 | 2012-11-19 | Conduction-type polarizing and beam-splitting synchronized lighting device |
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| Publication Number | Publication Date |
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| CN102929088A true CN102929088A (en) | 2013-02-13 |
| CN102929088B CN102929088B (en) | 2015-03-18 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08286151A (en) * | 1995-04-11 | 1996-11-01 | Fuji Photo Optical Co Ltd | Polarizing direction array element |
| CN101290467A (en) * | 2008-06-05 | 2008-10-22 | 北京理工大学 | Tangible real three-dimensional display method based on multi- projector rotating panel three-dimensional image |
| CN102566234A (en) * | 2012-01-12 | 2012-07-11 | 北京理工大学 | Light-guiding type white light synchronous illuminating device for multi-projector true three-dimensional displayer |
-
2012
- 2012-11-19 CN CN201210469148.0A patent/CN102929088B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08286151A (en) * | 1995-04-11 | 1996-11-01 | Fuji Photo Optical Co Ltd | Polarizing direction array element |
| CN101290467A (en) * | 2008-06-05 | 2008-10-22 | 北京理工大学 | Tangible real three-dimensional display method based on multi- projector rotating panel three-dimensional image |
| CN102566234A (en) * | 2012-01-12 | 2012-07-11 | 北京理工大学 | Light-guiding type white light synchronous illuminating device for multi-projector true three-dimensional displayer |
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| CN102929088B (en) | 2015-03-18 |
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