CN102929088B - 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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- CN102929088B CN102929088B CN201210469148.0A CN201210469148A CN102929088B CN 102929088 B CN102929088 B CN 102929088B CN 201210469148 A CN201210469148 A CN 201210469148A CN 102929088 B CN102929088 B CN 102929088B
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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, particularly relates to for the conduction-type polarization spectro synchronous illuminator in projector.
Background technology
The projector of the true three digit display of multi-projector becomes circumference arrangement, flat screen forwards the figure just projector during projector being gone out to corresponding cross section to, screen rotates continuously, Series of Plane Section Image compounding by rotating shaft is gone out complete true 3-dimensional image depending on persisting effect by human eye, to reconstruct distortionless true 3-dimensional image, screen rotates and should to throw light on Complete Synchronization with projector.
A kind of placement scheme of multi-projector and multiple illumination path is disclosed in Chinese patent application CN101038421A, which use at least Liang Tai projector, put around a rotary screen, by corresponding angle two dimensional image synchronized projection on a Rotation screen, thus reconstruct the 3-D view similar to real-world object.Wherein there is following problems, first, the illumination light of employing is natural light, and because LCD and LCOS spatial light modulator conventional at present requires linearly polarized light illumination, therefore the optical energy loss of synchronous lighting light path is larger; Secondly, biography light beam and projector are arranged one to one, and quantity is a lot, and cost is higher; In addition, the incidence 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 comparatively far away, and the bore of optical element is also corresponding comparatively large, thus adds the volume and moment of inertia that rotate light path.
Summary of the invention
The present invention proposes a kind of conduction-type polarization spectro synchronous illuminator, can overcome defect described in the prior art.
This conduction-type polarization spectro synchronous illuminator, comprising: light source, lamp guide, polarization splitting prism, the first camera lens, polarized light converting unit, the second camera lens; The light that wherein light source sends focuses on lamp guide, the plane of incidence of polarization splitting prism is bonding with the exit facet of lamp guide, incident light is divided into First Line polarized light and the second linearly polarized light by polarization splitting prism, First Line polarized light is projected to one in multiple first projector by the first camera lens, the polarization direction of the second linearly polarized light converts to identical with the polarization direction of First Line polarized light by polarized light converting unit, and the second linearly polarized light changed through polarization direction is projected in multiple second projector by the second camera lens;
This device also comprises a rotating mechanism, described rotational structure drives light path system to rotate, make the linearly polarized light of the first camera lens and the second camera lens outgoing be projected to the first projector and the second projector successively, 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 circular, square or rectangle.
Wherein, the incident end face shape of lamp guide is circular.
Wherein, the outgoing end surface shape of lamp guide is square or rectangle.
Wherein, the upper and lower bottom surface of polarization splitting prism is all polished optical surface, and light is totally reflected at this optical surface place.
Wherein, polarization conversion unit is 1/2 wave plate.
Wherein, between polarization splitting prism and the first camera lens, there is first guarantor's local derviation optical wand.
Wherein, the second linearly polarized light is reflexed to polarization conversion unit by reflecting prism after polarization splitting prism outgoing.
Wherein, there is second guarantor's local derviation optical wand between reflecting prism and polarization conversion unit.
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 two-route wire polarized light, while light splitting, achieve the conversion of natural light to linearly polarized light, improve light efficiency, reduce the light disturbance in projector.Meanwhile, adopt light-guiding type to pass light mode and shorten biography electrical distance in projector, structure is simple, easy for installation, reduce costs, also make lighting source homogenising simultaneously.
Accompanying drawing explanation
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 in the present invention between lens axis and lamp guide center.
Embodiment
Below, describe in detail by reference to the accompanying drawings according to a preferred embodiment of the invention.For convenience of description and highlight the present invention, in accompanying drawing, eliminate existing associated components in prior art, and the description to these well-known components will be omitted.
Figure 1 shows that the light path of conduction-type polarized light synchronous illuminator.Light source 1 is reflective cup type lighting source, also the lighting source of other type can be adopted, the light that light source sends focuses on lamp guide 2, the cross sectional shape of lamp guide can be circle, square and rectangle, or also can adopt circular entrance end, the lamp guide of square or rectangular output end, outgoing end face and polarization splitting prism (PBS) 3 close contact or bonding of lamp guide.Natural light is divided into the mutually orthogonal linearly polarized light of two-way by PBS3, and S direction linearly polarized light through protecting local derviation optical wand 5, then throws light on through lens 6,7 and catoptron 8 pairs of projectors 9.P direction linearly polarized light through PBS3 transmission reflects through prism 4, then throws light on to projector 9 through lamp guide 13 and 1/2 wave plate 14 and lens and catoptron.
The upper and lower bottom surface of PBS prism is generally uneven surface, and scattering is serious, and can not be totally reflected, the transfer efficiency of light is very low.In the present embodiment, the upper bottom surface of PBS3 is polished to optical surface, light can be totally reflected, thus improve optical transmission efficiency, as shown in Figure 2.The inclined-plane of the reflecting prism 4 in the present embodiment is coated with total reflection film, and upper bottom surface is polished to optical surface equally, and light can be totally reflected.The P direction linearly polarized light that guarantor's local derviation optical wand 13 sends is become S direction linearly polarized light by 1/2 wave plate 14, makes the polarization direction of the polarized light of two-arm outgoing identical, is the polarization direction required by projector.
The rotation of motor 12 is sent to rotating shaft 10 by gear 11, drives synchronous lighting light path to rotate, alternately throws light on to projector.All projectors are all identical with the height of catoptron, and the lighting optical axis height of Ji Ge projector is identical, and the beam center height of two-arm outgoing is also identical simultaneously.The optical axis of lens 6,7 exceeds distance a relative to the center of lamp guide 5, makes the center translation of outgoing beam to the height identical with projector lighting optical axis, as shown in Figure 3.Wherein a meets following formula (1):
Wherein D is the height protecting local derviation optical wand, f
1' be the focal length of lens 6, f
2' be the focal length of lens 7.The optical axis of lens 15,16 should to moving down a distance a, also use formula (1) to calculate in lamp guide 13 center relatively.Protect local derviation optical wand 5,13 geomery identical, its cross sectional shape is square or rectangle.
Just several preferred embodiment of the present invention described in this instructions, 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, comprising: light source, lamp guide, polarization splitting prism, the first camera lens, polarized light converting unit, the second camera lens; It is characterized in that: the light that wherein light source sends focuses on lamp guide, the plane of incidence of polarization splitting prism is bonding with the exit facet of lamp guide, incident light is divided into First Line polarized light and the second linearly polarized light by polarization splitting prism, First Line polarized light is projected to one in multiple first projector by the first camera lens, the polarization direction of the second linearly polarized light converts to identical with the polarization direction of First Line polarized light by polarized light converting unit, and the second linearly polarized light changed through polarization direction is projected in multiple second projector by the second camera lens;
Described first camera lens comprises lens 6,7 and first catoptron 8, and wherein lens 6,7 optical axis is parallel, and First Line polarized light throws light on to the first projector 9 through catoptron 8 after lens 6,7 again; Described second camera lens comprises lens 15,16 and second catoptron, and wherein lens 15,16 optical axis is parallel, and the second linearly polarized light throws light on to the second projector through lens 15,16 and second catoptron;
The lighting optical axis height of all projectors is identical, and the optical axis of lens 6,7 exceeds distance a relative to the center of first guarantor's local derviation optical wand 5
1; The optical axis relative second of lens 15,16 protects local derviation optical wand 13 center to moving down a distance a
2:
Wherein protect the height of local derviation optical wand 5 as D using first, the focal length of lens 6 is as f
1', the focal length of lens 7 is as f
2', calculate a obtained and be a
1;
Wherein using second protect local derviation optical wand 13 height as D, the focal length of lens 15 is as f
1', the focal length of lens 16 is as f
2', calculate a obtained and be a
2.
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 to rotate, make the linearly polarized light of the first camera lens and the second camera lens outgoing be projected to the first projector and the second projector successively, 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, and the cross sectional shape of lamp guide is circular, square or rectangle.
4. conduction-type polarization spectro synchronous illuminator as claimed in claim 3, is characterized in that: wherein, and the incident end face shape of lamp guide is circular.
5. conduction-type polarization spectro synchronous illuminator as claimed in claim 3, it is characterized in that: wherein, the outgoing end surface shape of lamp guide is square or rectangle.
6. the conduction-type polarization spectro synchronous illuminator as described in claim 1 or 2 or 4 or 5, it is characterized in that: wherein, the upper and lower bottom surface of polarization splitting prism is all polished optical surface, and light is totally reflected at this optical surface place.
7. the conduction-type polarization spectro synchronous illuminator as described in claim 1 or 2 or 4 or 5, it is characterized in that: wherein, polarization conversion unit is 1/2 wave plate.
8. the conduction-type polarization spectro synchronous illuminator as described in claim 1 or 2 or 4 or 5, is characterized in that: wherein, between polarization splitting prism and the first camera lens, has first guarantor's local derviation optical wand.
9. the conduction-type polarization spectro synchronous illuminator as described in claim 1 or 2 or 4 or 5, is characterized in that: wherein, has second guarantor's local derviation optical wand between reflecting prism and polarization conversion unit.
10. the conduction-type polarization spectro synchronous illuminator as described in claim 1 or 2 or 4 or 5, it is characterized in that: wherein, the second linearly polarized light is reflexed to polarization conversion unit by reflecting prism after polarization splitting prism outgoing.
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| 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 |
|---|---|---|---|
| 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 CN102929088A (en) | 2013-02-13 |
| CN102929088B true 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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| CN102929088A (en) | 2013-02-13 |
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