CN100474033C - High efficiency dual bulb lighting system - Google Patents
High efficiency dual bulb lighting system Download PDFInfo
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- CN100474033C CN100474033C CNB2003101225610A CN200310122561A CN100474033C CN 100474033 C CN100474033 C CN 100474033C CN B2003101225610 A CNB2003101225610 A CN B2003101225610A CN 200310122561 A CN200310122561 A CN 200310122561A CN 100474033 C CN100474033 C CN 100474033C
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- collector lens
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- reflected light
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Abstract
The invention provides a double-light source illuminating system, which comprises: a confocal focusing lens group consisting of a first condensing lens and a second condensing lens; the first light source system is arranged opposite to the first condenser lens; and the second light source system is adjacent to the first light source system and is arranged opposite to the second condenser lens. The first light source system comprises a first bulb, a first parabolic reflector and a first reflecting mirror, wherein the first bulb is arranged at the focus of the first parabolic reflector, and the second reflecting mirror is arranged between the first parabolic reflector and the first condensing lens; the second light source system comprises a second bulb, a second parabolic reflector and a second plane mirror, the second bulb is arranged at the focus of the second parabolic reflector, and the second reflector is arranged between the second parabolic reflector and the second condenser lens.
Description
Technical field
The invention reside in provides a kind of illuminator, refers to a kind of two bulbs also can dwindle the optical limit value (etendue) of synthetic light beam as light source illuminator of using especially.
Background technology
On present market, projector can be divided into four classes: CRT (Cathode Ray Tube) projector, LCD (Liquid Crystal Display) projector, DLP (DigitalLight Processing) projector and LCOS (Liquid Crystal on Silicon) projector because of the difference of employed display technique.Wherein, CRT projector is because some technical limitation of self are eliminated gradually; LCD projector then is more popular projector at present because of characteristics such as having height and look lightness, volume is small and exquisite, rich color; And DLP projector since its have and utilize the numerical digit optical imaging concept, utilize principle of reflection and the advantage of the higher light utilization efficiency of tool, commodity stability, light utilization efficiency and portable or the like aspect, to become main product gradually; As for LCOS projector, though,, therefore be considered to be a kind of design that has development potentiality in the numerical digit shadow casting technique because of having the advantage of high-res because it is still not satisfactory in product weight and brightness.And if the projector's product with regard to releasing in the recent exhibition, remain emphasizing and super can take (Ultra-Portable) and attach most importance to, and DLP projector promptly has compact characteristic, so DLP projector has just like become the product of star's level in the present commercial portable projector market.
All kinds of projectors technology principle of developing substantially is similar, mainly all is luminous by Halogen lamp LED or xenon lamp etc., projects image with the image with panel through reflection or transmission through light harvesting to panel, again through beam split, close photosystem, at last image is projected the screen video picture.And wherein the guardian technique of DLP projector be utilize a kind of by two bit PMs control semiconductor element DMD (Digital Micromirror Device, numerical digit micro-mirror element) but be used as reflection unit and go forward side by side with projects images to screen.Wherein DMD can be very quick and the reflexive control numerical digit of tool optical switch outside, also can accurately control light source.Each DMD wafer comprises thousands of small square reflecting optics (micro mirror) again.By the light of light source (light) emission after alternately projecting the DMD surface, all micro mirrors on the DMD wafer, quantity according to each color (red green or blue) in the pel of self correspondence, determined it this coloured light is in the number of times of open position, also promptly determined the reflection back by the light quantity of projection lens projects to the screen.Because DMD has reflectivity and high characteristic of filling up rate, can produce higher optical efficiency, so DLP projector needing to be highly suitable for the purposes of high brightness and high image resolution.Preferable thermal diffusivity also makes DLP projector can use the light source of high wattage, and the life-span that can not lower DMD; The full digitisation design of DLP also provides more correct and stable regeneration image simultaneously.0.8 kilogram product has appearred in DLP projector product at present, but the product miniaturization has its limit on the application demand of market, meaning toward more miniaturization development is just not too big again, the contest of technology will be turned to the improvement of developing technique by compactization, for example provide the projector of performances such as high color saturation, high brightness, high-res, rapid reaction rate to think the following main flow of pursuing.
Geometrically, there is one to describe that geometry ultimate value luminous or that receive light is called etendue, etendue is one and amasss with beam cross section and the relevant numerical value of sine function of beam divergence angle that it is defined as follows:
E＝A′sin(q)2
E:etendue wherein
A: beam cross section is long-pending
Q: the dispersion angle of light beam
Though DLP projector is the preferable machine of optical energy utilization efficiency in all kinds of projectors, each manufacturer still is devoted to improve its service efficiency for luminous energy, advances to guarantee that it can continue to be positioned at the leading position on business projector market.
At present, each manufacturer many having changed in the design of light engine adopts the new illuminator with two bulbs to replace tradition only to have the illuminator of single light source so that the utilization ratio of raising luminous energy.But the etendue value of DLP projector is the specification that depends on employed DMD.And be big than the DMD desirable value more than the etendue value of the directly synthetic light beam of two bulb illuminators.Therefore as if the utilization ratio of thinking to improve really luminous energy, provide a cover appropriateness to dwindle synthetic light beam etendue value to have splendid industrial value in fact with the required two light-source illuminating systems that match of DMD.
Therefore, in view of the shortcoming of known technology, be through concentrated test and research, and a spirit of working with perseverance, develop " the high efficiency pair of bulb illuminator " of this case eventually.
Summary of the invention
Fundamental purpose of the present invention is to provide projector's design that has the high-light-energy service efficiency and meet the illuminator of product miniaturization.
The light engine that provides one to have performances such as high brightness, high-res, rapid reaction rate then is provided another object of the present invention.
Another purpose of the present invention is to provide a kind of illuminator, and it comprises: have the focusing condenser lens group altogether, be made up of first collector lens and second collector lens; One first light-source system that is provided with this first collector lens subtend and one adjacent with this first light-source system and with the secondary light source system of this second collector lens subtend setting.Wherein aforesaid first light-source system comprises first bulb, first parabolic mirror and the first movable reflecting surface mirror, wherein this first bulb is arranged at the focus of this first parabolic mirror, and this first movable reflecting surface mirror then is arranged between this first parabolic mirror and this first collector lens.On the other hand, aforesaid secondary light source system then comprises second bulb, second parabolic mirror and the second movable reflecting surface mirror, wherein this second bulb is arranged at the focus of this second parabolic mirror, and this second movable reflecting surface mirror then is arranged between this second parabolic mirror and this second collector lens.
According to above-mentioned conception, wherein this first movable reflecting surface mirror and this second movable reflecting surface mirror are all movable level crossing.
According to above-mentioned conception, wherein this first parabolic mirror and this second parabolic mirror are not to be arranged in parallel.
According to above-mentioned conception, wherein this first parabolic mirror will reflect the first kind reflected light and the second class reflected light because of being subjected to this first bulb irradiation.
According to above-mentioned conception, wherein this first kind reflected light directly enters this first collector lens.
According to above-mentioned conception, wherein this second class reflected light then reflexes to this first movable reflecting surface mirror, and becomes this first kind reflected light by this first movable reflecting surface mirror reflection.
According to above-mentioned conception, wherein this second parabolic mirror will reflect the 3rd class reflected light and the 4th class reflected light because of being subjected to this second bulb irradiation.
According to above-mentioned conception, wherein the 3rd class reflected light directly enters this second collector lens.
According to above-mentioned conception, wherein the 4th class reflected light then reflects and enters this second movable reflecting surface mirror, and becomes the 3rd class reflected light by the reflection of this second movable reflecting surface mirror.
According to above-mentioned conception, wherein this first collector lens inboard is configured as first oblique angle.
According to above-mentioned conception, wherein this second collector lens inboard is configured as second oblique angle.
According to above-mentioned conception, wherein this first collector lens is connected with this second oblique angle with this this first oblique angle of second collector lens mat.
Another purpose of the present invention is to provide another kind of illuminator, it comprises: have the focusing condenser lens group altogether, comprise first collector lens and second collector lens, one first light-source system that is provided with this first collector lens subtend, and one adjacent with this first light-source system and with the secondary light source system of this second collector lens subtend setting.Wherein this first light-source system comprises first bulb, the first reflecting surface mirror and first parabolic mirror, this first parabolic mirror will reflect the first kind reflected light and the second class reflected light because of being subjected to this first bulb irradiation again, and this first bulb then is arranged at the focus of this first parabolic mirror; This first reflecting surface mirror then be positioned between this first parabolic mirror and this first collector lens and with this second reflected light forward setting.Aforesaid secondary light source system then comprises second bulb, the second reflecting surface mirror and second parabolic mirror, wherein this second parabolic mirror can be imprisoned and be sold second bulb irradiation and reflect the 3rd class reflected light and the 4th class reflected light, wherein this second bulb is arranged at the focus of this second parabolic mirror again, and this second reflecting surface mirror is positioned between this second parabolic mirror and this second collector lens and with the 4th class reflected light forward setting.
According to above-mentioned conception, wherein this first kind reflected light directly enters this first collector lens.
According to above-mentioned conception, wherein the 3rd class reflected light directly enters this second collector lens.
According to above-mentioned conception, wherein this first collector lens inboard is configured as first oblique angle.
According to above-mentioned conception, wherein this second collector lens inboard is configured as second oblique angle.
According to above-mentioned conception, wherein this first collector lens is connected with this second oblique angle with this this first oblique angle of second collector lens mat.
Another purpose of the present invention is to provide a kind of light engine, and it comprises: a focus lens group is a pair of light-source illuminating system that comprises first collector lens and second collector lens, is provided with this focus lens group subtend, and a light uniformization conduit.Wherein this pair light-source illuminating system comprises first bulb, first parabolic mirror, the first reflecting surface mirror, second bulb, second parabolic mirror and the second reflecting surface mirror, wherein this first bulb and this second bulb are arranged at the focus place of this first parabolic mirror and this second parabolic mirror respectively, and this first reflecting surface mirror and this second reflecting surface mirror then are arranged between this first parabolic mirror and this first collector lens respectively and between this second parabolic mirror and this second collector lens.This light uniformization conduit then lays respectively at the heteropleural of the saturating group of this focusing with this pair light-source illuminating system, can be in order to transmit first focused beam of assembling through this first collector lens and second focused beam of assembling through this second collector lens.
According to above-mentioned conception, wherein this first reflecting surface mirror and this second reflecting surface mirror are all level crossing.
According to above-mentioned conception, wherein this first parabolic mirror and this second parabolic mirror can be respectively because of being subjected to this first bulb and this second bulb irradiation to produce first kind reflected light and the second class reflected light and the 3rd class reflected light and the 4th class reflected light.
According to above-mentioned conception, wherein this first kind reflected light and the 3rd class reflected light are directly injected this first collector lens and this second collector lens respectively.
According to above-mentioned conception, wherein this first reflecting surface mirror and this second reflecting surface mirror reflect this second class reflected light and the 4th class reflected light respectively.
According to above-mentioned conception, wherein the inboard of this first collector lens is configured as first oblique angle.
According to above-mentioned conception, wherein the inboard of this second collector lens is shaped to second oblique angle.
According to above-mentioned conception, wherein this first collector lens and this this first oblique angle of second collector lens mat and this second oblique angle fluid-tight engagement.
According to above-mentioned conception, wherein this first reflecting surface mirror and this second reflecting surface mirror cover this first collector lens and this second collector lens partly respectively.
A further object of the present invention is to provide another kind of light engine, and it comprises: a focus lens group comprises at least one collector lens respectively, wherein the confocal point of this collector lens and being provided with this parabolic mirror subtend respectively; At least one light-source illuminating system, be provided with this focus lens group subtend respectively, and respectively have a bulb, a parabolic mirror and a reflecting surface mirror, wherein this bulb is arranged at the focus place of this parabolic mirror, and this reflecting surface mirror is arranged between this parabolic mirror and this focus lens group, and a light uniformization conduit, lay respectively at the heteropleural of this focus lens group with this light-source illuminating system, in order to transmit at least one focused beam.
According to above-mentioned conception, wherein this reflecting surface mirror is movable level crossing.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1: two light-source system synoptic diagram of preferred embodiment of the present invention.
Fig. 2: the reflected light path synoptic diagram of this case preferred embodiment.
Fig. 3: the reflected light path synoptic diagram of another preferred embodiment of this case.
Embodiment
See also Fig. 1, be two light-source system synoptic diagram of preferred embodiment of the present invention.As shown in Figure 1, two light-source systems 1 comprise first bulb 11, second bulb 12, first parabolic mirror 13, second parabolic mirror 14, first plane mirror 15, second plane mirror 16, first collector lens 17, second collector lens 18 and light uniformization conduit 19.Wherein first bulb 11 is positioned at the focus of first parabolic mirror 13, second bulb 12 is positioned at the focus of second parabolic mirror 14, and utilize and fit tightly and confocal first collector lens 17 and second collector lens 18, can effectively reach the effect of closing light, the light intensity of going forward side by side and being provided with the two light-source systems 1 of remarkable lifting.For avoid first collector lens 17 and second collector lens 18 when engaging because of the not close light leakage phenomena that takes place of fitting, the present invention has the design at first oblique angle 171 and second oblique angle 181 respectively on first collector lens 17 and second collector lens 18, see through the design of aforesaid oblique angle, two light-source systems 1 can effectively reduce meaningless luminous energy consume.
See also Fig. 2, be the reflected light path synoptic diagram of preferred embodiment of the present invention.As shown in Figure 2, when first parabolic mirror 13 can reflect first kind reflected light 131 because of being subjected to 11 irradiations of first bulb, 133 and the second class reflected light 132, wherein this second class reflected light 132 is through first plane mirror 15 reflection back one-tenth one reflected light 151, and this reflected light 151 can be again be reflected into first kind reflected light 134 and enters in first collector lens 17 through first parabolic mirror 13.On the other hand, when second parabolic mirror 14 can reflect the 3rd class reflected light 141 because of being subjected to 12 irradiations of second bulb, the 143 and the 4th class reflected light 142, wherein the 4th class reflected light 142 is reflected into a reflected light 161 through second plane mirror 16, and this reflected light 161 can be again be reflected into the 3rd class reflected light 144 and enters in second collector lens 18 through second parabolic mirror 14.
See also Fig. 2 and Fig. 3, wherein Fig. 3 is the reflected light path synoptic diagram of another preferred embodiment of the present invention.As Fig. 2 and shown in Figure 3, rotate first plane mirror 15 can related change reflected light 151 be reflected into respectively with the path of reflected light 134 first kind reflected light 151 ', 134 ', and and then change angle when entering first collector lens 17; And rotate second plane mirror 16 can related change reflected light 161 be reflected into the path of reflected light 144 reflected light 161 ' with reflected light 144 ', and can so the angle of change when entering second collector lens 18.As shown in the above, see through the etendue value that rotation first plane mirror 15 and second plane mirror 16 are provided the two light-source systems 1 of may command.
In addition, change first plane mirror 15 of appropriateness and the size of second plane mirror 16, also the size of the light beam that may command is new (but, postrotational first plane mirror 15 and second plane mirror 16 should be kept the state of energy shaded portions first collector lens 17 and second collector lens 18, to avoid the meaningless excessive mistake of luminous energy), again through the light that closes of first collector lens 17 and second collector lens 18, so may command enters the etendue value of light uniformization conduit 19.
As mentioned above, design of the present invention is not difficult for the problem of aligning except there being general spherical mirror, also can reach reduced volume and the purpose of dwindling the luminous point size by the design that sees through confocal collector lens combination.And the employed plane mirror of this case (for example: first plane mirror 15 or second plane mirror 16) is movable level crossing, therefore can adjust the angle of plane mirror on demand at reflex time, as long as the light that reflects can be received by the collector lens combination again after parabolic mirror (as first parabolic mirror 13 or second parabolic mirror 14) reflection; This measure is that may command is synthesized the etendue value of light beam to meet demand.Another advantage of this case only be to need to change plane mirror (first plane mirror 15 or second plane mirror 16) size (but plane mirror need keep can shaded portions the collector lens group, this measure can be avoided meaningless optical energy loss) can reach the purpose of control etendue value because of the size that changes synthetic light beam.
Can be appointed and execute that the craftsman thinks and be to modify as all by being familiar with present technique field person even if this case has been described in detail by the above embodiments, right neitherly take off desire protection as attached claim institute.
Claims (13)
1. illuminator, it comprises:
Confocal collector lens group is made up of first collector lens and second collector lens;
First light-source system and this first collector lens subtend are provided with, comprise first bulb, first parabolic mirror and the first movable reflecting surface mirror, wherein this first bulb is arranged at the focus of this first parabolic mirror, and this first movable reflecting surface mirror is arranged between this first parabolic mirror and this first collector lens; And
Secondary light source system and this first light-source system is adjacent and be provided with this second collector lens subtend, system comprises second bulb, second parabolic mirror and the second movable reflecting surface mirror, wherein this second bulb is arranged at the focus of this second parabolic mirror, and this second movable reflecting surface mirror is arranged between this second parabolic mirror and this second collector lens.
2. illuminator as claimed in claim 1 is characterized in that, this first movable reflecting surface mirror and this second movable reflecting surface mirror all are movable level crossing.
3. illuminator as claimed in claim 1 is characterized in that, this first parabolic mirror and this second parabolic mirror are not to be arranged in parallel.
4. illuminator as claimed in claim 1 is characterized in that, this first parabolic mirror will reflect first reflected light and second reflected light because of being subjected to this first bulb irradiation;
This first reflected light directly enters this first collector lens; And
This second reflected light then reflexes to this first movable reflecting surface mirror, and becomes this first reflected light by the reflection of this first movable reflecting surface mirror.
5. illuminator as claimed in claim 1 is characterized in that,
This second parabolic mirror will reflect the 3rd reflected light and class four reflected light because of being subjected to this second bulb irradiation;
The 3rd reflected light directly enters this second collector lens; And
The 4th reflected light then reflexes to this second movable reflecting surface mirror, and becomes the 3rd reflected light by the reflection of this second movable reflecting surface mirror.
6. illuminator as claimed in claim 1 is characterized in that,
This first collector lens inboard is configured as first oblique angle;
This second collector lens inboard is configured as second oblique angle; And
This first collector lens is connected with this second oblique angle with this this first oblique angle of second collector lens mat.
7. illuminator, it comprises:
The focusing condenser lens group comprises first collector lens and second collector lens altogether;
First light-source system and this first collector lens subtend are provided with, comprise first bulb, the first movable reflecting surface mirror and first parabolic mirror, wherein this first parabolic mirror will reflect first reflected light and second reflected light because of being subjected to this first bulb irradiation, this first reflected light directly enters this first collector lens, this second reflected light reflects earlier in this first movable reflecting surface mirror, reflect again in this first parabolic mirror, enter this first collector lens, and this first bulb is arranged at the focus of this first parabolic mirror, this first movable reflecting surface mirror then be positioned between this first parabolic mirror and this first collector lens and with this second reflected light forward setting; And
Secondary light source system and this first light-source system is adjacent and be provided with this second collector lens subtend, comprise second bulb, the second movable reflecting surface mirror and second parabolic mirror, wherein this second parabolic mirror reflects the 3rd reflected light and the 4th reflected light because of being subjected to this second bulb irradiation, the 3rd reflected light directly enters this second collector lens, the 4th reflected light reflects earlier in this second movable reflecting surface mirror, reflect again in this second parabolic mirror, enter this second collector lens, wherein this second bulb is arranged at the focus of this second parabolic mirror again, and this second movable reflecting surface mirror is positioned between this second parabolic mirror and this second collector lens and with the 4th reflected light forward setting.
8. light engine, it comprises:
One focus lens group comprises first collector lens and second collector lens;
A pair of light-source illuminating system and this focus lens group subtend are provided with, comprise first bulb, first parabolic mirror, the first movable reflecting surface mirror, second bulb, second parabolic mirror and one second movable reflecting surface mirror, wherein this first bulb and this second bulb are arranged at the focus place of this first parabolic mirror and this second parabolic mirror respectively, and this first movable reflecting surface mirror is arranged between this first parabolic mirror and this first collector lens, and this second movable reflecting surface mirror is arranged between this second parabolic mirror and this second collector lens; And
One light uniformization conduit lays respectively at the saturating heteropleural of organizing of this focusing with this pair light-source illuminating system, in order to transmit first focused beam of assembling through this first collector lens and second focused beam of assembling through this second collector lens.
9. light engine as claimed in claim 8 is characterized in that, this first collector lens of this first movable reflecting surface mirror shaded portions, and this second collector lens of this second movable reflecting surface mirror shaded portions.
10. light engine as claimed in claim 8 is characterized in that,
The inboard of this first collector lens is configured as first oblique angle;
The inboard of this second collector lens is configured as second oblique angle; And
This first collector lens and this second collector lens are by this first oblique angle and this second oblique angle fluid-tight engagement.
11. light engine as claimed in claim 8, it is characterized in that, this first parabolic mirror is subjected to this first bulb irradiation and produces first reflected light and second reflected light, and this second parabolic mirror is subjected to this second bulb irradiation and produces the 3rd reflected light and the 4th reflected light.
12. light engine as claimed in claim 11 is characterized in that, this first movable reflecting surface mirror and this second movable reflecting surface mirror reflect this second reflected light and the 4th reflected light respectively.
13. a light engine, it comprises:
One focus lens group comprises at least one collector lens, and wherein said at least one collector lens and parabolic mirror subtend are provided with, and when the number of described at least one collector lens be two or greater than two the time, described collector lens is confocal point;
At least one light-source illuminating system, this light-source illuminating system and this focus lens group subtend are provided with, and this light-source illuminating system has a bulb, a parabolic mirror and a movable reflecting surface mirror, wherein this bulb is arranged at the focus place of this parabolic mirror, and this movable reflecting surface mirror is arranged between this parabolic mirror and this focus lens group; And
One light uniformization conduit lays respectively at the heteropleural of this focus lens group with this light-source illuminating system, in order to transmit at least one focused beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101225610A CN100474033C (en) | 2003-12-12 | 2003-12-12 | High efficiency dual bulb lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101225610A CN100474033C (en) | 2003-12-12 | 2003-12-12 | High efficiency dual bulb lighting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1627123A CN1627123A (en) | 2005-06-15 |
| CN100474033C true CN100474033C (en) | 2009-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101225610A Expired - Fee Related CN100474033C (en) | 2003-12-12 | 2003-12-12 | High efficiency dual bulb lighting system |
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| CN (1) | CN100474033C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100412612C (en) * | 2005-07-01 | 2008-08-20 | 台达电子工业股份有限公司 | Double-lamp framework for L-shaped optical machine |
| CN104360468B (en) * | 2014-12-03 | 2017-06-16 | 长春理工大学 | A kind of sunlight superchromaticity collects optical system |
| CN111885364B (en) * | 2020-06-24 | 2023-08-15 | 歌尔微电子有限公司 | Micro-projection device and electronic device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5649753A (en) * | 1994-05-16 | 1997-07-22 | Matsushita Electric Industrial Co., Ltd. | Projection display apparatus |
| DE19941272A1 (en) * | 1999-08-31 | 2001-03-08 | Isco Optic Gmbh | Illumination system using an afocal cylindrical lens system |
| CN1300953A (en) * | 1999-12-23 | 2001-06-27 | 中强光电股份有限公司 | LCD projector with double lamp structure |
| US6402325B1 (en) * | 1999-04-16 | 2002-06-11 | Fuji Photo Optical Co., Ltd. | Illuminating optical system having multiple light sources and lenticular arrays for use with a projection-type display unit |
| US6488379B2 (en) * | 2001-04-13 | 2002-12-03 | Phillips Electronics | Video projector illumination system using two lamps having complementary beams patterns |
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2003
- 2003-12-12 CN CNB2003101225610A patent/CN100474033C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5649753A (en) * | 1994-05-16 | 1997-07-22 | Matsushita Electric Industrial Co., Ltd. | Projection display apparatus |
| US6402325B1 (en) * | 1999-04-16 | 2002-06-11 | Fuji Photo Optical Co., Ltd. | Illuminating optical system having multiple light sources and lenticular arrays for use with a projection-type display unit |
| DE19941272A1 (en) * | 1999-08-31 | 2001-03-08 | Isco Optic Gmbh | Illumination system using an afocal cylindrical lens system |
| CN1300953A (en) * | 1999-12-23 | 2001-06-27 | 中强光电股份有限公司 | LCD projector with double lamp structure |
| US6488379B2 (en) * | 2001-04-13 | 2002-12-03 | Phillips Electronics | Video projector illumination system using two lamps having complementary beams patterns |
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| CN1627123A (en) | 2005-06-15 |
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