CN101825830B - Reflection-type optical engine - Google Patents
Reflection-type optical engine Download PDFInfo
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- CN101825830B CN101825830B CN2009100569295A CN200910056929A CN101825830B CN 101825830 B CN101825830 B CN 101825830B CN 2009100569295 A CN2009100569295 A CN 2009100569295A CN 200910056929 A CN200910056929 A CN 200910056929A CN 101825830 B CN101825830 B CN 101825830B
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- light source
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 17
- 230000010287 polarization Effects 0.000 claims description 45
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
Abstract
The invention refers to a portable micro-projector, and discloses a reflection-type optical engine. In the invention, a polarizing beam splitter is placed with a spacing distance necessarily kept between two objective lenses for sharing space, thereby maintaining the spacing distance required between the two objective lenses and saving the space so as to reduce the volume of the optical engine. Furthermore, one or more lenses of the objective lenses can be integrally formed with the polarizing beam splitter so as to improve the precision of the optical engine assembly. Through integral formation of the optical element between the polarizing beam splitter and the optical modulator with the polarizing beam splitter, the liquid crystal optical valve can be arranged closer to the polarizing beam splitter.
Description
Technical field
The present invention relates to portable minisize projector, particularly the miniaturization technologies of portable minisize projector.
Background technology
In order will also to want little portable minisize projector or the projector that the equipment such as notebook carry out embedded design to be carried out practical with respect to palm, just need to develop the little projector's light engine of volume.
The structure of traditional reflection-type optical engine as shown in Figure 1, wherein 10R is red light source, and 10G is green light source, and 10B is blue-light source, 20 is diffuser, 30 is beam shaping, and 40 is object lens, and 50R, 50G and 50B are the dichronic mirror of red, green and blue, 60 is photomodulator, 70 is projection lens, and 80 is polarization spectroscope (Polarizing Beam Splitter is called for short " PBS ").In order to reduce the volume of reflection-type optical engine, the structure of optical engine system will be simplified.
But the light that light source penetrates is incided before the photomodulator that forms image, the shape of light beam must be changed, to adapt to the shape of photomodulator effective coverage.Play the element of this effect, just be called beam shaping (Beam shaper).For the area source size of the efficient image by beam shaping is adjusted to the area slightly larger than the effective coverage, just need two object lens.Arriving the area source area of photomodulator, is to be decided by the distance between beam shaping and this two object lens.
The area source area that how will arrive photomodulator is adjusted to required area effectively, is the key factor that affects the light engine efficiency.But in order to reach above effect, according to certain spacing distance ranking, this has just caused the increase of light engine volume to need three kinds of optical elements (beam shaping and two object lens).
Summary of the invention
The object of the present invention is to provide a kind of reflection-type optical engine, can reduce the volume of light engine.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of reflection-type optical engine, comprising:
At least one light source;
Photomodulator, the photogenerated image that utilizes light source to send;
Projection lens, the image that photomodulator is generated amplifies projection;
Polarization spectroscope is thrown between the mirror at photomodulator and projection;
Object lens comprise at least two lens, are used for the light that will enter photomodulator is carried out boundling, have at least lens to be installed in light source one side of polarization spectroscope in the object lens, and have at least lens to be installed in photomodulator one side of polarization spectroscope.
Embodiment of the present invention compared with prior art, the key distinction and effect thereof are:
Two object lens place polarization spectroscope in the spacing distance that must keep, with sharing space, both kept required spacing distance between two object lens, also saved the space simultaneously, thereby reduced the volume of light engine.In addition, the lens that are installed in photomodulator one side of polarization spectroscope can play the effect of first lens of projection lens simultaneously, can from the projection lens that must be formed by a plurality of lens, save lens like this, reach the effect of dwindling the projection lens volume, thereby further reduced the volume of light engine.
Further, by the one or more lens in the object lens and polarization spectroscope are carried out integrated molding, can improve the precision of light engine assembling.
Further, by the optical element between polarization spectroscope and the photomodulator and polarization spectroscope are carried out integrated molding, liquid crystal light valve can be arranged near polarization spectroscope more, thereby further reduced the volume of light engine, in addition, assembling during light engine to becoming simple because only need photomodulator is aimed at polarization spectroscope, it is easier to operate.
Further, by introduce beam shaping between light source and photomodulator, the beam shaping that light source can be penetrated becomes to adapt to the plane of incidence shape of photomodulator, thereby improves optical efficiency.
Further, the two sides of beam shaping has all consisted of fly's-eye lens, thereby has improved the effect of beam shaping with limited volume.
Description of drawings
Fig. 1 is the simple schematic diagram of traditional reflection-type optical engine;
Fig. 2 is the skeleton diagram of reflection-type optical engine in the first embodiment of the invention;
Fig. 3 is the skeleton diagram of reflection-type optical engine in the second embodiment of the invention;
Fig. 4 is the skeleton diagram of reflection-type optical engine in the third embodiment of the invention;
Fig. 5 is the skeleton diagram of reflection-type optical engine in the four embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each embodiment, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of reflection-type optical engine, and its structure as shown in Figure 2.
This reflection-type optical engine comprises: R light source (10R), G light source (10G), B light source (10B), dichronic mirror 50R, 40G, 50B, diffuser (20), beam shaping (30), object lens (40-1,40-2), photomodulator (60), projection lens (70), polarization spectroscope (80), wherein R represents redness, and G represents green, and B represents blue.
The R/G/B light source shines R/G/B light successively, specifically, the time of a frame of irradiation is made as T, the time irradiation R light source of T/3, and the time irradiation G light source of the T/3 that follows, the T/3 time of following is again shone the B light source.Be appreciated that light source also can be according to other order successively irradiation, such as B/G/R etc.
Although used three LASER Light Source in the present embodiment, the present invention is not limited to LASER Light Source, the number of light source also is not limited to three.For example, in some other embodiment of the present invention, can use light emitting diode (Light Emitting Diode is called for short " LED ") light source, the perhaps hybrid light source of laser and LED.Light source also can be one, perhaps other number.
Three light sources (10R, 10G, 10B) are by separately dichronic mirror 50R, 50G, 50B reflection or be transmitted to diffuser (20).
The effect that dichronic mirror 50G plays reflection G light source (green laser that irradiates from 10G) and allows residual ray see through, dichronic mirror 50G also can use the general mirror that common visible rays all can be reflected.Dichronic mirror 50R plays the effect of reflection R light source (red laser that irradiates from 10R), the light by the residue wavelength coverage, and dichronic mirror 50B plays reflection R light source (blue laser that irradiates from 10B) by the effect of residue wavelength coverage light.
Diffuser (20) is perpendicular to the optical axis vibration, and in the time of therefore by diffuser (20), the randomness of light (Randomness) can be increased.This diffuser is the device that arranges in order to eliminate the distinctive laser speckle of laser (Speckle), reaches the purpose that reduces laser speckle in order to continuity (Coherence) feature that reduces laser beam.
Light by diffuser (20) can pass through beam shaping (Beam Shaper) to change beam shape.
In the present embodiment, beam shaping (30) is fly's-eye lens, the surface of this fly's-eye lens has a plurality of micro objective bodies to arrange with matrix form, the effect of beam shaping (30) is that the beam shaping that light source penetrates is become to adapt to the plane of incidence shape of photomodulator, thereby improves optical efficiency.
In the present embodiment of using LASER Light Source, beam shaping is comprised of a plurality of lenslet bodies, diameter 80-500um, thus make the easier shaping of light beam.This is because the diameter of micro objective is understood because the continuity of laser produce the grid lines in light beam less than the words of 80um, and is difficult to make the lens arrangement of the shiny surface also less than 80um under prior art.The effect that diameter becomes large words beam shaping can weaken, and can not get the required uniform source of light of miniature optical engine, thus with below the 500um for well.
Each lenslet body is comprised of the lenslet mixing of multiple different sizes, thereby laser speckle is reduced.
The lenslet shape is consistent with the shape of photomodulator effective coverage, thereby it is minimum that light loss is dropped to.
In other embodiment of the present invention, beam shaping also can be can't help fly's-eye lens and be consisted of, but only is made of one or two lenslet.
In the present embodiment, beam shaping (30) has all consisted of fly's-eye lens on the two sides, and is corresponding one by one respectively at a plurality of micro objective bodies of two sides moulding, thereby improved the effect of beam shaping with limited volume.In other embodiment of the present invention, also can use 2 pieces of single face fly's-eye lenses.
Object lens (40-1,40-2) are the lens that the light through the beam shaping shaping carried out boundling, generally are comprised of two lens, can reach more accurately focusing by regulating two distances between the lens.
Photomodulator (60) refers to that the light with incident carries out selectivity by, blocking-up or changes the element that optical path forms the image picture.The representative instance of photomodulator (60) has Digital Micromirror Device (DigitalMicromirror Device, abbreviation " DMD "), liquid crystal display (Liquid Crystal Display, abbreviation " LCD ") element, liquid crystal on silicon (Liquid Crystal On Silicon is called for short " LCOS ") etc.
DMD is used in digital light to process (Digital Light Processing, abbreviation " DLP ") element of projector, it utilizes a type of drive of sequential (field sequential), uses the digital mirror (DIGITAL MIRROR) of arranging with the as many matrix form of pixel quantity.DLP refers to regulate optical path from the light that light source irradiation goes out with digital mirror, and reflects to reach gradual change (Gradation) or form visual projector with dividing plate.
Liquid crystal display cells (LCD) refers to that optionally the ON/OFF liquid crystal forms visual element.Use in the projector of LCD element, direct viewing type (direct-view), porjection type and reflection-type are arranged.The direct viewing type projection is the mode that the bias light of liquid crystal display cells back forms image and can directly observe by the LCD panel; The porjection type projection is to project screen after the image that will form by liquid crystal display cells utilizes projection lens to amplify, and observes from the mode of the image of screen reflection; The structure of reflection-type and porjection type is basic identical, distinguishes part and is, reflection-type substrate below LCD is provided with reflectance coating, and the light of reflection is exaggerated and projects on the screen.
LCOS belongs to reflective liquid crystal and shows, it in the past the lower substrate in the two sides substrate of liquid crystal display end change silicon substrate into by transparent glass, thereby operate with the reflection-type mode.
Polarization spectroscope (80) is to play the optical element that incident light is delivered to the effect of photomodulator (60), and in the hexahedron of its glass material, the polarisation diffusion barrier distributes with diagonal line, is the necessary optical element of reflection-type optical engine.
Incident light arrives on the polarisation diffusion barrier of polarization spectroscope (80), and the S polarisation can be by abandoning, and the P polarisation then can be reflected to the direction of photomodulator.Therefore, from light source (10) light out, need to a certain position conversion (Conversion) on light path become the form of linearly polarized light just can keep optical efficiency.But the polarization that comes from the light self of LASER Light Source compares up to hundreds of ratios one, so do not need the extra optical element that is used for forming linearly polarized light that adds.
So enter the P polarisation of photomodulator, can form the S polarisation when going out photomodulator, the visual light that converts the S polarisation to then incides in the polarization spectroscope (80) again, contacts with polarization separating film.At this moment visual light all is the S polarisation, therefore can by the whole transmissions of polarisation diffusion barrier, incide in the projection lens (70).
Projection lens (70) is made of a plurality of lens, will be throwed to upper amplification of screen (identifying among the figure) by the image that photomodulator (60) form.
Because first, second object lens will keep the spacing distance stipulated, so in the present embodiment polarization spectroscope (80) are placed between the first object lens (40-1) and the second object lens (40-2).Wherein, the first object lens (40-1) are installed in light source one side of polarization spectroscope (80), and the second object lens (40-2) are installed in photomodulator (60) one sides of polarization spectroscope (80).
Utilize this layout, between two object lens place polarization spectroscope in the spacing distance that must keep, with sharing space, both kept required spacing distance between two object lens, also saved the space simultaneously, thereby reduced the volume of light engine.
In addition, this scheme also has another advantage.Because be reflective light modulators, therefore can pass through the second object lens (40-2) twice from the path of light, the size that can play incident light when passing through is for the first time adjusted to the effect of photomodulator effective coverage, then can play the effect of the first lens of projection lens when passing through for the second time.Therefore can from the projection lens that must be formed by a plurality of lens, save lens like this, reach the effect of dwindling the projection lens volume, thereby further reduced the volume of light engine.
Second embodiment of the invention relates to a kind of reflection-type optical engine, and the second embodiment improves on the basis of the first embodiment.
The problem of the first embodiment is that object lens must be fixed by framework, can cause like this increase of light engine volume, and in addition, along with the path increase of the light that arrives photomodulator, the loss of light also can increase.
For the miniature optical engine of minitype projection machine, very high for the tolerance requirement of lens position simultaneously, in assembling, aim at (Alignment) and have very large difficulty.
Therefore, consider optical efficiency, photomodulator (60) must be positioned as close to polarization spectroscope (80), and need to further dwindle the volume of light engine.
In the second embodiment, will as the liquid crystal light valve of reflective light modulators and the optical element between the polarization spectroscope (80), carry out integrated molding with polarization spectroscope (80).Specifically, lens (being equivalent to the 40-2 among Fig. 2) that are installed in photomodulator one side of polarization spectroscope are integrated moldings with polarization spectroscope (80), and its structure as shown in Figure 3.
Among Fig. 3, there is not independently optical element between polarization spectroscope and the photomodulator.By the optical element between polarization spectroscope and the photomodulator and polarization spectroscope are carried out integrated molding, liquid crystal light valve can be arranged near polarization spectroscope more, thereby further reduced the volume of light engine, in addition, assembling during light engine to becoming simple, because only need photomodulator is aimed at polarization spectroscope, it is easier to operate.
Third embodiment of the invention relates to a kind of reflection-type optical engine.The 3rd embodiment has carried out another kind of improvement on the basis of the first embodiment, main improvements are: lens (being equivalent to the 40-1 among Fig. 2) that are installed in light source one side of polarization spectroscope are integrated moldings with polarization spectroscope (80), as shown in Figure 4, this integrated difficulty of aiming at when assembling light engine that also can reduce.
Four embodiment of the invention relates to a kind of reflection-type optical engine.The 4th embodiment also improves on the basis of the first embodiment, and main improvements are:
Object lens comprise at least three lens (40-4,40-5 and 40-6), wherein be installed in polarization spectroscope photomodulator one side lens (40-6) and be installed in the common and polarization spectroscope (80) of the lens (40-5) of light source one side of polarization spectroscope and carry out integrated molding, as shown in Figure 5.This scheme can be arranged liquid crystal light valve more near polarization spectroscope, thereby further reduce the volume of light engine, in addition, assembling during light engine to becoming simple, because only need photomodulator is aimed at polarization spectroscope, it is easier to operate.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (6)
1. reflection-type optical engine comprises:
At least one light source;
Photomodulator, the photogenerated image that utilizes described light source to send;
Projection lens, the image that described photomodulator is generated amplifies projection;
Polarization spectroscope is thrown between the mirror at described photomodulator and projection;
Object lens are used for the light that will enter described photomodulator is carried out boundling;
It is characterized in that having at least lens to be installed in light source one side of described polarization spectroscope in the described object lens, and have at least lens to be installed in photomodulator one side of described polarization spectroscope;
Described object lens comprise three lens, wherein be installed in described polarization spectroscope photomodulator one side lens and be installed in the lens of light source one side of described polarization spectroscope common with described polarization spectroscope integrated molding.
2. reflection-type optical engine according to claim 1 is characterized in that, does not have independently optical element between described polarization spectroscope and the described photomodulator.
According to claim 1 and 2 in each described reflection-type optical engine, it is characterized in that, also comprise:
Beam shaping between described light source and object lens, is used for the light beam that described light source penetrates is converted to the effective coverage shape of photomodulator;
Described beam shaping is fly's-eye lens, and there are a plurality of micro objective bodies of arranging with matrix form on the surface of this fly's-eye lens.
4. reflection-type optical engine according to claim 3 is characterized in that, described beam shaping has all consisted of fly's-eye lens on the two sides, and is corresponding one by one respectively at a plurality of micro objective bodies of two sides moulding.
According to claim 1 and 2 in each described reflection-type optical engine, it is characterized in that, described light source has a plurality of, comprises at least one LASER Light Source in each light source, perhaps comprises at least one light emitting diode light source in each light source.
6. reflection-type optical engine according to claim 5 is characterized in that, described photomodulator is one of following:
Liquid crystal display cells, Digital Micromirror Device, liquid crystal on silicon;
Described photomodulator during with the field sequential mode a plurality of light sources are modulated.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100569295A CN101825830B (en) | 2009-03-06 | 2009-03-06 | Reflection-type optical engine |
| JP2011600070U JP3174811U (en) | 2009-03-06 | 2010-01-13 | Reflective optical engine |
| PCT/CN2010/070167 WO2010099708A1 (en) | 2009-03-06 | 2010-01-13 | Reflective type optical engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100569295A CN101825830B (en) | 2009-03-06 | 2009-03-06 | Reflection-type optical engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101825830A CN101825830A (en) | 2010-09-08 |
| CN101825830B true CN101825830B (en) | 2013-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100569295A Expired - Fee Related CN101825830B (en) | 2009-03-06 | 2009-03-06 | Reflection-type optical engine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3174811U (en) |
| CN (1) | CN101825830B (en) |
| WO (1) | WO2010099708A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012623A (en) * | 2010-11-02 | 2011-04-13 | 上海理工大学 | Miniature projector system connected by wireless signal |
| CN102012622A (en) * | 2010-11-02 | 2011-04-13 | 上海理工大学 | External-suspension projecting apparatus using SATA (serial advanced technology attachment) interface |
| CN102063001A (en) * | 2010-11-19 | 2011-05-18 | 封燕鸣 | Solid light source single-system time-division color projector and projecting method |
| CN102692717A (en) * | 2011-03-23 | 2012-09-26 | 上海三鑫科技发展有限公司 | Optical engine employing polarization reflector |
| CN102736381A (en) * | 2011-04-09 | 2012-10-17 | 上海三鑫科技发展有限公司 | Optical engine used for reflection-type mini-projector |
| JP2016061897A (en) | 2014-09-17 | 2016-04-25 | ソニー株式会社 | Illumination device and projection display device |
| CN105867060A (en) * | 2016-05-31 | 2016-08-17 | 深圳市华星光电技术有限公司 | Projection device and system |
| CN111025836A (en) * | 2019-12-31 | 2020-04-17 | 深圳市中科创激光技术有限公司 | Optical path system and projector |
| CN113311587A (en) * | 2021-05-07 | 2021-08-27 | 广景视睿科技（深圳）有限公司 | Compound eye lens module, lighting device and DLP ray apparatus module |
| CN117590679B (en) * | 2024-01-19 | 2024-04-19 | 宜宾市极米光电有限公司 | Light source device and projection apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1576950A (en) * | 2003-06-25 | 2005-02-09 | 伊斯曼柯达公司 | Display apparatus |
| CN1580940A (en) * | 2003-08-14 | 2005-02-16 | 日本电气视象技术株式会社 | Projection display device |
| CN101025447A (en) * | 2006-02-17 | 2007-08-29 | 上海信诚至典网络技术有限公司 | Two-face fly-eye lens |
| JP2008268960A (en) * | 2008-04-21 | 2008-11-06 | Seiko Epson Corp | Projection display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003149416A (en) * | 2001-11-16 | 2003-05-21 | Hitachi Ltd | Multi-polarization beam splitter device and projection type projector device using the same |
| JP2003215529A (en) * | 2002-01-18 | 2003-07-30 | Seiko Epson Corp | Projector |
| JP2005221761A (en) * | 2004-02-05 | 2005-08-18 | Nikon Corp | Projection display |
| CN101231452B (en) * | 2008-01-31 | 2010-04-14 | 浙江金成科技发展有限公司 | A reflective light valve micro-projector |
-
2009
- 2009-03-06 CN CN2009100569295A patent/CN101825830B/en not_active Expired - Fee Related
-
2010
- 2010-01-13 WO PCT/CN2010/070167 patent/WO2010099708A1/en not_active Ceased
- 2010-01-13 JP JP2011600070U patent/JP3174811U/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1576950A (en) * | 2003-06-25 | 2005-02-09 | 伊斯曼柯达公司 | Display apparatus |
| CN1580940A (en) * | 2003-08-14 | 2005-02-16 | 日本电气视象技术株式会社 | Projection display device |
| CN101025447A (en) * | 2006-02-17 | 2007-08-29 | 上海信诚至典网络技术有限公司 | Two-face fly-eye lens |
| JP2008268960A (en) * | 2008-04-21 | 2008-11-06 | Seiko Epson Corp | Projection display |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010099708A1 (en) | 2010-09-10 |
| JP3174811U (en) | 2012-04-12 |
| CN101825830A (en) | 2010-09-08 |
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