CN101546031A - Imaging system and optical machine - Google Patents
Imaging system and optical machine Download PDFInfo
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- CN101546031A CN101546031A CN200810088338A CN200810088338A CN101546031A CN 101546031 A CN101546031 A CN 101546031A CN 200810088338 A CN200810088338 A CN 200810088338A CN 200810088338 A CN200810088338 A CN 200810088338A CN 101546031 A CN101546031 A CN 101546031A
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- fresnel lens
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Abstract
The invention relates to an imaging system and an optical machine containing the same. The imaging system comprises at least one lens assembly, a light valve and a Fresnel lens. The Fresnel lens is provided with an accommodating part which is suitable for matching and accommodating at least one part of the lens assembly and replacing the prior non-spherical lens to focus a light beam to the light valve. A light valve reflecting light beam enters the lens assembly for imaging. Accordingly, the Fresnel lens can properly reduce the surface area of the accommodating part to reduce the influence of stray light on the imaging quality and to save lens materials so as to save the cost.
Description
Technical field
Relevant a kind of imaging system of the present invention and ray machine; The imaging system and the ray machine of particularly relevant a kind of non-parallel light path (Non-Telecentric) configuration.
Background technology
Along with the prosperity of the development of modern society and high-tech industry, various projection arrangement costs constantly reduce, and various projection arrangements more and more generally are used in each government unit, company's row number, academic unit even the family.Digit optical is handled (Digital Light Processing at present, DLP) projection arrangement replaces other projection arrangements gradually becomes main flow, this digital optical process projection device is to use digital micromirror device (Digital MicromirrorDevice, DMD) but as handling light beam that light source produced, making the main element of suitable imaging one picture of light beam, can promote brightness and reduce the used heat that projector equipment produced.
Existing digital optical process projection device (figure does not show) is the low cost of begging to surrender, and adopts the ray machine (figure does not show) of non-parallel light path (Non-Telecentric) configuration usually.As shown in Figure 1, this ray machine comprises an imaging system 11, and this imaging system 11 comprises a lens assembly 111, a digital micromirror device 113 and a catoptron 114.For simplifying the configuration of optical path, imaging system 11 also comprises a non-spherical lens (Aspheric Lens) 112 focused beams 10 on digital micromirror device 113, as shown in the figure, imaging system 11 receives a light beam 10, and utilizes catoptron 114 reflections to enter in the non-spherical lens 112.Light beam 10 can be entered lens assembly 111, then projection imaging by digital micromirror device 113 reflections after non-spherical lens 112 focuses on digital micromirror device 113.Yet, because of the illumination stage (by the direction of digital micromirror device 113) and the angle between imaging session (by the direction of digital micromirror device 113) of optical path toward lens assembly 111 toward non-spherical lens 112 very little, thereby the space is crowded relatively, make non-spherical lens 112 usually with lens assembly 111 generation mechanisms on interference, therefore must on non-spherical lens 112, cut a part of volume on the practice, make on the non-spherical lens 112 to form a recess 112a, and by the part of the ccontaining lens assembly 111 of this recess 112a.Because non-spherical lens 112 has suitable thickness, the tangent plane that therefore forms this recess 112a also has suitable area.This moment is after light beam 10 exposes to non-spherical lens 112, some is injected the relation of the light beam 10 of non-spherical lens 112 because of use angle, with the tangent plane inner face generation total reflection (figure does not show) of recess 112a since then, and be scattering into to reluctant parasitic light and enter in the lens assembly 111, cause having a strong impact on image quality.
Design in the past is to make the light beam 10 that exposes to non-spherical lens 112 avoid recess 112a and tangent plane inner face thereof as far as possible, but the area that so makes light beam 10 expose to non-spherical lens 112 reduces, that is reduce the service efficiency of non-spherical lens 112, thereby also have influence on the brightness performance of ray machine.In view of this, how to reduce the parasitic light because of using non-spherical lens 112 to produce, this is the industry problem demanding prompt solution.
Summary of the invention
A purpose of the present invention is to provide a kind of imaging system that is used for a projection arrangement.This imaging system is suitable can to reduce the influence of parasitic light to image quality.
Another object of the present invention is to provide a kind of ray machine that comprises this imaging system.
For reaching above-mentioned purpose, imaging system of the present invention comprises a lens assembly, a light valve (Light Valve) and a Fresnel lens (Fresnel Lens).Light valve has a reflecting surface, and reflecting surface is in the face of lens assembly and Fresnel lens.The present invention utilizes this Fresnel lens to replace existing non-spherical lens (Aspheric Lens), focuses on the reflecting surface of a light beam to light valve, then enters the lens assembly with imaging by this reflecting surface folded light beam.Fresnel lens is formed with a holding part, is suitable for cooperating at least a portion of ccontaining lens assembly, the suitable surface area that can reduce holding part (with respect to the recess of existing non-spherical lens) of Fresnel lens, and reduce the influence of parasitic light to image quality.By Fresnel lens, imaging system is suitable can to reduce the influence of parasitic light to image quality, and can save lens material simultaneously, and then saves cost.
Description of drawings
For above-mentioned purpose of the present invention, technical characterictic and advantage can be become apparent, below conjunction with figs. is elaborated to preferred embodiment of the present invention, wherein:
Fig. 1 is existing imaging system synoptic diagram;
Fig. 2 is a ray machine synoptic diagram of the present invention; And
Fig. 3 is the imaging system synoptic diagram of another embodiment of the present invention.
Embodiment
At first, please refer to Fig. 2, the preferred embodiment of imaging system 21 of the present invention is to be applied to a digit optical to handle (Digital Light Processing, DLP) the employed ray machine 2 of projection arrangement (figure does not show), and this ray machine 2 is configurations of a non-parallel light path (Non-Telecentric), but imaging system of the present invention 21 also can be applicable to the projection arrangement of other kinds.Ray machine 2 comprises an imaging system 21 and an illuminator 22.Wherein, illuminator 22 comprises all light devices (Uniformizer) 222 of a light source 221 and, and light source 221 is suitable to produce a light beam 20, and light beam 20 is through all being incident in the imaging system 21 after light device 222 homogenising.Be noted that, light source 221 can adopt mercury vapor lamp, tungsten lamp or even light emitting diode (Light emitting diode, LED) or other various light sources that may be applied to projection arrangement, and all light device 222 also can adopt integration rod (Integration Rod), optical channel (Light Tunnel) or other various devices that are used for homogenising light, does not limit at this.
As shown in the figure, because the folder degree between illumination stage and the imaging session is very little, interferes for avoiding Fresnel lens 212 and lens assembly 211, so be formed with a holding part on the Fresnel lens 212, to cooperate at least a portion of ccontaining lens assembly 211.In present embodiment, holding part is a recess 212a.Yet in other implement aspects, but also fit lens assembly 211 and be corresponding shape of holding part is not limited to the shape of the 211a of recess shown in the figure.The present invention utilizes Fresnel lens 212 to replace employed non-spherical lens in the existing projection arrangement imaging system, because the thickness of Fresnel lens 212 is compared existing non-spherical lens and is obviously reduced, so that the area of recess 212a tangent plane is correspondingly obviously reduced, compared to prior art, the minimizing of the area of this recess 212a and inner face thereof can make the service efficiency of this Fresnel lens 212 promote, and then the amount of parasitic light is obviously reduced, do not have influence on the brightness of ray machine 2 simultaneously yet.In the present invention, the thickness of Fresnel lens 212 is between 2 millimeters to 4 millimeters, preferably comes down to 2 millimeters, and the demand of refractive index is selected from suitable material during Fresnel lens 212 viewable design, as glass and transparent polymer material etc., this part is not given unnecessary details.
Fig. 3 illustrates another embodiment of imaging system of the present invention.The imaging system 21 ' of present embodiment also comprises a reflection horizon 215 and is formed on the Fresnel lens 212 ', to replace the catoptron 214 among Fig. 2.Wherein, Fresnel lens 212 ' need be made corresponding change, is arranged at the position of original catoptron 214 together with reflection horizon 215, makes light beam 20 by reflection horizon 215 reflections, and is focused on the light valve 213 by Fresnel lens 212 '.Similarly, Fresnel lens 212 ' is formed with a recess 212a ', is suitable for cooperating at least a portion of ccontaining lens assembly 211, avoids mutual interference.It should be noted that at this, the Fresnel lens 212 ' of Fig. 3 and recess 212a ' are different with Fresnel lens 212 and the recess 212a shape of Fig. 2, be because of Fresnel lens 212 ' and recess 212a ' present position difference in present embodiment, its shape need be made corresponding change, with fit lens assembly 211 and other elements.Therefore, Fresnel lens 212,212 ' that is illustrated among each figure and recess 212a, the shape of 212a ' is not in order to restriction interest field of the present invention, at this lay special stress on.
Sum up, the present invention utilizes Fresnel lens to replace employed non-spherical lens in the existing imaging system, compared to prior art, the present invention not only makes the area of holding part obviously reduce, and then the amount of parasitic light is obviously reduced, also reduce simultaneously overall space, the employed material of saving lens of ray machine 2, cost is reduced.Right Fresnel lens 212 only is to obtain easier slimming lens at present, and any existing or following optical element that is about to produce and has or similarity identical with Fresnel lens 212 applies to configuration of the present invention, all still belongs to substituting of equivalence.
The above embodiments only are used for exemplifying enforcement aspect of the present invention, and explain technical characterictic of the present invention, are not to be used for limiting protection category of the present invention.Any be familiar with this operator can unlabored change or the arrangement of the isotropism scope that all belongs to the present invention and advocated, the scope of the present invention should be as the criterion with the application's claim institute restricted portion.
Claims (12)
1. imaging system that is used for a projection arrangement comprises:
One lens assembly;
One Fresnel lens;
One light valve has a reflecting surface, and this reflecting surface is in the face of this lens assembly and this Fresnel lens;
Whereby, a light beam is suitable can to pass through this Fresnel lens, focuses to the reflecting surface of this light valve, and reflection then enters this lens assembly.
2. imaging system according to claim 1 is characterized in that this Fresnel lens is formed with a holding part, is suitable for cooperating at least a portion of ccontaining this lens assembly.
3. imaging system according to claim 2 is characterized in that also comprising a catoptron, and this light beam, is fitted this Fresnel lens and can be focused on this light beam in this light valve to this Fresnel lens by this mirror reflects.
4. imaging system according to claim 2 is characterized in that also comprising a reflection horizon and is formed on this Fresnel lens, and this light beam passes through this reflective layer reflects, and is focused on this light valve by this Fresnel lens.
5. imaging system according to claim 2 is characterized in that this holding part is a recess.
6. imaging system according to claim 1 is characterized in that this light valve is a digital micromirror device.
7. imaging system according to claim 1, the thickness that it is characterized in that this Fresnel lens are between 2 millimeters to 4 millimeters.
8. imaging system according to claim 7 is characterized in that this thickness is 2 millimeters.
9. imaging system according to claim 1, the material that it is characterized in that this Fresnel lens are to be selected from the group that glass and transparent polymer material become.
10. a ray machine comprises an imaging system according to claim 1 and an illuminator, and wherein this illuminator comprises a light source, and is suitable to produce this light beam.
11. ray machine according to claim 10 is characterized in that this illuminator also comprises equal light device, and this Fresnel lens receives by this equal this light beam of light device.
12. ray machine according to claim 10 is characterized in that it is the ray machine of a non-parallel light path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810088338A CN101546031A (en) | 2008-03-27 | 2008-03-27 | Imaging system and optical machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810088338A CN101546031A (en) | 2008-03-27 | 2008-03-27 | Imaging system and optical machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101546031A true CN101546031A (en) | 2009-09-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810088338A Pending CN101546031A (en) | 2008-03-27 | 2008-03-27 | Imaging system and optical machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101546031A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970027A (en) * | 2016-01-13 | 2017-07-21 | 德律科技股份有限公司 | Optical measuring system and optical imaging system |
-
2008
- 2008-03-27 CN CN200810088338A patent/CN101546031A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970027A (en) * | 2016-01-13 | 2017-07-21 | 德律科技股份有限公司 | Optical measuring system and optical imaging system |
| CN106970027B (en) * | 2016-01-13 | 2019-10-15 | 德律科技股份有限公司 | Optical measuring system and optical imaging system |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090930 |