CN1900762A - Projector with light shading device and its stray light clearing method - Google Patents
Projector with light shading device and its stray light clearing method Download PDFInfo
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- CN1900762A CN1900762A CN200510089508.4A CN200510089508A CN1900762A CN 1900762 A CN1900762 A CN 1900762A CN 200510089508 A CN200510089508 A CN 200510089508A CN 1900762 A CN1900762 A CN 1900762A
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Abstract
Projector includes following parts: an illumination system; a digital mini lens set illuminated by the illumination system; a lens of receiving light beams reflected by digital mini lens set, and focalizing and imaging light beams. Being setup between the illumination system and the digital mini lens set of the projector, a shading unit is in use for screening out stray light generated from the illumination system.
Description
[technical field]
Present invention is directed to projector, especially a kind of use digital micro-mirror device (DMD) also can be avoided the projector of interference of stray light.
[prior art]
Use digital micro-mirror device (DMD, digital micromirror device) projector, its principle of work is to have a plurality of minitype reflector in this digital micro-mirror device as photoswitch, accept electronic signal, as the character of digital electronic signal, the output that produces the light character by the angle of inclination that changes minitype reflector.Each minitype reflector can reflect away light towards two angles, the camera lens that cooperates a light source and a projection imaging to use, when minitype reflector be in " opening " (conducting, on) state just turns to an angle, light source is shone the light that comes be reflected into camera lens and imaging on a screen; When minitype reflector be in " pass " (not conducting, off) state just turns to another angle, and light is reflexed to other place, this moment, screen just seemed quite dark with respect to the position of this minitype reflector.What digital micro-mirror device received is the electronics character, and sends the optics character, and this technology is called two bit pulse width modulations (binary pulse widthmodulation), and the then non-emphasis of the present invention of detailed content is so will not give unnecessary details.
See also Fig. 2, be the internal structure synoptic diagram of existing digital micro-mirror device (DMD) projector.Wherein light source 10 provides digital micro-mirror device 2 light sources, middle then light is concentrated and projecting on the digital micro-mirror device 2 of homogenising as much as possible by condenser 12, and after digital micro-mirror device 2 is handled the light that is received, again light is reflexed to camera lens 5, and be imaged onto a screen (among the figure disclose) by camera lens 5 and go up and produce an effective image area 41 ', yet in order completely to contain digital micro-mirror device 2, and view field's shape that condenser 12 is produced is circular, so digital micro-mirror device 2 visual inscribed quadrilaterals of doing condenser 12 view fields, therefore also the view field zone that must have a part exceeds digital micro-mirror device 2, this i.e. formed parasitic light district 45 around digital micro-mirror device 2, then be considered as effective lighting district 41 as for not exceeding the zone that just is projeced on the micro-mirror device 2, also be to contain digital micro-mirror device 2 with respect to camera lens 5 again with imaging coil (image circle), so also can exceed the scope of digital micro-mirror device 2, and reflective together the projecting in parasitic light district 45 become spuious image area 45 ' on the screen, making the audience see effective image area 41 ' image in addition, is kind of an interference for the audience.
For solving the puzzlement that this parasitic light 45 is caused, several means is arranged, wherein a kind of promptly is that parts give the delustring processing around digital micro-mirror device 2, reduce strong reflect light by increasing rough surface, but can not eliminate fully reflective, just allow digital micro-mirror device 2 around seem darker; Another kind of mode is in the mode of baffle plate light to be isolated around digital micro-mirror device 2, though avoided the reflection of other electronic components on every side of digital micro-mirror device 2, but still can not eliminate fully reflective because parasitic light still be projeced into digital micro-mirror device 2 around; Also having a kind of mode is that the light that directly illuminator 100 is projected is shaped as square, yet, the light of illuminator 100 need through one or more catoptron with irradiate light on digital micro-mirror device 2, so through after the reflection of catoptron, the often non-as expection of view field's shape of light.
See also Fig. 1, be the existing perspective view that does not have the projector of shade, wherein projector 1, comprise an illuminator 100, in order to this light source of projector to be provided, therefore wherein more comprise a light source 10, produce first light 10 ', in the place ahead of this light source 10 one condenser 12 is set then, normally eyeglass combination, and first light 10 ' is directive condenser 12, condenser 12 then becomes first light, 10 ' optically focused the 12 ' projection of one second light to a reflector group 14, usually reflector group 14 is made up of one or more catoptron, with the present invention, reflector group 14 can be divided into one first catoptron 141 and second catoptron 142, wherein first catoptron 141 is by the 12 ' irradiation of second light, and reflect one the 3rd light, 141 ' directive, second catoptron 142, and second catoptron 142 is reflecting one the 4th light 142 ', this the 4th light 142 ' is directive one digital micro-mirror device 2 (DMD, digital micromirrordevice), and this digital micro-mirror device 2 is according to received electronic signal itself, change the inclination angle of minitype reflector (not disclosing among the figure) wherein, again the 4th light 142 ' is reflected away to become image strip 20 ' and seized and become a projected light beam 50 ' by camera lens 5, at last, go up formation one projection image area 4 ' at a screen (disclosing among the figure).
Wherein, why to utilize the reason of reflector group 14 to be that this digital micro-mirror device 2 needs the irradiation of light source, and the angle of the incident of this light source is unsuitable excessive, thus need utilize reflector group 14 will by the side of digital micro-mirror device 2 throwed and light adjust to suitable angle and be incident to digital micro-mirror device 2.Again, illuminator 100 then is to be that illuminator 100 has certain volume with the reason that digital micro-mirror device 2 forms mitre, as obstinately in order to form low-angle angle with digital micro-mirror device 2, certainly will have influence on the configuration of camera lens 5, that is to say and have the situation generation that illuminator 100 is in close proximity to camera lens 5, make both check and balance, and because camera lens must almost face digital micro-mirror device 2, therefore for instance, if illuminator 100 will have enough illumination intensities, light source 10 must increase with the volume potential of condenser 12 so, will take the space of camera lens 5 thus, cause and to use the camera lens that has zoom and move s function, because the camera lens volume that has zoom or move s function is bigger usually, just diameter is big and length is also longer, on the contrary, if use the camera lens that has zoom or move s function, will take the space of illuminator 100, so just illuminator 100 can be moved to than the place of side with away from camera lens 5 in order to avoid the phase mutual interference, thus generated new problem is exactly that the angle of the optical axis of illuminator 100 and digital micro-mirror device 2 is excessive, in order to reach the effect that angle reduces as far as possible, so utilized reflector group 14 that the light of illuminator 100 is changed angle in order to irradiation digital micro-mirror device 2, therefore, by first catoptron 141 in the reflector group 14 and second catoptron 142, the angle that makes the 4th light 142 ' shine digital micro-mirror device 2 is reduced to minimum value as far as possible.
Yet, though utilized first catoptron 141 and second catoptron 142 can make that the suffered exposure intensity convergence of digital micro-mirror device 2 each independent minitype reflector is consistent, but because first catoptron 141 and second catoptron 142 are reflected away the deflection of light angle again, so changed with the region shape of second light, 12 ' institute projection, therefore after reflection through first catoptron 141 and second catoptron 142, the shape of the projected area 4 of the 4th light 142 ' has suitable different with view field's shape of second light 12 ', please continue to consult Fig. 1, wherein the 4th light 142 ' projected area 4 of being throwed roughly is rendered as one trapezoidal, an effective lighting district 41 and a distortion light district 43 have wherein been comprised, and so-called effective lighting district, promptly be that its field of illumination is effectively to be encompassed on the digital micro-mirror device 2, so-called distortion light district 43 then is the peripheral part that shines digital micro-mirror device 2, and owing to camera lens 5 has zoom usually or moves s function, so its imageable imaging coil of institute is bigger, if the scope in distortion light district 43 is to be stored in the imaging coil of camera lens 5, then will be seized and throw away by camera lens 5, form a projection image area 4 ', this moment, effective image area 41 ' promptly corresponded to the scope in this effective lighting district 41, and distorted image district 43 ' then corresponds to the scope in distortion light district 43.
Compare with the prior art of Fig. 2, though the distortion light district 43 that prior art produced of Fig. 1 is little more a lot of than the parasitic light district 45 of Fig. 2, and distorted image district 43 ' sometimes can not be incident upon on the screen, yet still can be imaged on screen around, and the sight line that might mirror spectators, so are kind of interference for spectators.
Therefore, in the field of projector, the utmost point needs a kind of projector that effectively avoids interference of stray light, and the user can be used easily.
[summary of the invention]
For reaching above-mentioned purpose, the invention provides a kind of projector with shade, comprise an illuminator, in order to this light source of projector to be provided, wherein more comprise a light source, produce light, a condenser, in order to this light-ray condensing, and a principal reflection mirror, in order to this light is reflected away.Projector also comprises a digital micro-mirror device (DMD), in order to accepting the light that this principal reflection mirror reflects, and gone out in handling back reflection, and a camera lens, in order to accept the light that this digital micro-mirror device is handled and reflected, this camera lens is with this light focusing imaging; And a shade, be arranged between this digital micro-mirror device and this illuminator, in order to the parasitic light that this illuminator produced is blocked.
As above-mentioned projector, wherein this catoptron produces a projected area when this light of reflection, comprise an effective lighting district and a distortion light district, wherein this effective lighting fauna is contained this digital micro-mirror device, and this distortion light district is this parasitic light and be formed on this effective lighting district around, again, more form a projecting light path between this projected area and this catoptron, comprise a formed effective lighting light path between this effective lighting district and this catoptron, and a formed distortion light path between this distortion light district and this catoptron, and this shade system is in order to block this distortion light path.
As above-mentioned projector, wherein this catoptron more comprises one first catoptron, is in order to change the direction of this light; And one second catoptron, in order to this light of accepting to be reflected, and this light reflexed to this digital micro-mirror device by this first catoptron.
As above-mentioned projector, wherein this shade system handles through delustring.
As above-mentioned projector, wherein said delustring is handled system and is selected from the delustring lacquer and plants a kind of in the hair.
For reaching above-mentioned purpose, the invention provides a kind of removing method that applies to the parasitic light of projector, comprise the following step: (1) provides an illuminator, in order to this light source of projector to be provided; (2) provide a digital micro-mirror device, in order to handling and reflection from the light of this illuminator; (3) produce a projecting light path between this illuminator and this digital micro-mirror device; (4) provide a shade between this illuminator and this digital micro-mirror device; And (5) provide a camera lens, in order to receiving by the light that this digital micro-mirror device reflected, and in addition imaging, wherein, this shade system is covered up the part of this projecting light path, with the ray cast of avoiding this part periphery to this digital micro-mirror device.
Aforesaid method, wherein this projecting light path more can be divided into an effective projecting light path and a distortion light path, and is this distortion light path by this part that this shade blocked.
For reaching above-mentioned purpose, the present invention provides a kind of micro-mirror device projector in addition, comprise irradiation, the camera lens that an illuminator, a digital micro-mirror device be subjected to this illuminator and accept light by this digital micro-mirror device reflected, and with this light focusing imaging, and this projector is characterised in that a shade more is set between this illuminator and this digital micro-mirror device, in order to the parasitic light that this illuminator produced is blocked.Aforesaid projector, wherein more form an effective lighting light path between this illuminator and this digital micro-mirror device, around this effective lighting light path, then form a distortion light path, wherein this shade system is positioned on this distortion light path, makes the distortion light path can not arrive this digital micro-mirror device.
Aforesaid projector, wherein this shade is a baffle plate, the light on the light path that directly will distort keeps off.
[description of drawings]
Fig. 1 is the existing perspective view that does not have the projector of shade;
Fig. 2 is the internal structure synoptic diagram of existing micro-mirror device (MD) projector;
Fig. 3 is the perspective view with projector of shade of the present invention; And
Fig. 4 is the schematic perspective view of the light path that produced between the present invention's second catoptron and the micro-mirror device.
[embodiment]
See also Fig. 3, be the perspective view with projector of shade of the present invention.Projector 1 ' wherein, comprise an illuminator 100, in order to this light source of projector to be provided, therefore wherein more comprise a light source 10, produce first light 10 ', in the place ahead of this light source 10 one condenser 12 is set then, normally eyeglass combination, and first light 10 ' is directive condenser 12, condenser 12 then becomes first light, 10 ' optically focused the 12 ' projection of one second light to a reflector group 14, usually reflector group 14 is made up of one or more catoptron, with the present invention, reflector group 14 can be divided into one first catoptron 141 and second catoptron 142, wherein first catoptron 141 is by the 12 ' irradiation of second light, and reflect one the 3rd light, 141 ' directive, second catoptron 142, and second catoptron 142 is reflecting one the 4th light 142 ', this the 4th light 142 ' is directive one digital micro-mirror device 2 (DMD, digital micromirrordevice), and this digital micro-mirror device 2 is according to received electronic signal itself, change the inclination angle of minitype reflector (not disclosing among the figure) wherein, again the 4th light 142 ' is reflected away to become image strip 20 ' and seized and become a projected light beam 50 ' by camera lens 5, at last, go up the effective image area 41 ' of formation at a screen (disclosing among the figure).Certainly, as the micro-mirror device of non-digitalization also do not have can not, just generally speaking with digital control comparatively convenient.
Please cooperate Fig. 4, be the schematic perspective view of the light path that produced between the present invention's second catoptron and the digital micro-mirror device.Wherein, the 4th light 142 ' that second catoptron 142 is reflected can and produce a projected area 4 on every side at digital micro-mirror device 2, this projected area 4 comprises an effective lighting district 41 and a distortion light district 43, wherein this effective lighting fauna is contained this digital micro-mirror device 2, and this distortion light district 43 is this parasitic light and be formed on this effective lighting district 41 around, again, more form a projecting light path 4t between this projected area 4 and second catoptron 142, comprise a formed effective lighting light path 41t between this effective lighting district 41 and second catoptron 142, and a formed distortion light path 43t between the distortion light district 43 and second catoptron 142, and this shade 3 for example is that shading baffle plate system is in order to block this distortion light path 43t.Thus, after distortion light path 43t is blocked, parasitic light just can not occur around digital micro-mirror device 2, that is only have effective lighting district 41 be projeced into digital micro-mirror device 2 on, even if so the imaging coil of camera lens 5 (please cooperate Fig. 3) is contained effective lighting district 41 part in addition, and also it doesn't matter, because can produce spuious optical distortion light path 43t earlier by 3 backstops of shade, and distortion light path 43t also forms a distortion shadow 43a who is blocked on shade 3, so around the digital micro-mirror device 2 will be a slice dark, natural just can imaging on screen, even there is imaging just very dark, therefore just can not interfere with the user yet yet.So upward just only can have an effective image area 41 ' at a screen (disclosing among the figure), and the distorted image district 43 ' that existing projector 1 is produced will not exist.
Please consult Fig. 3 and Fig. 4 simultaneously, it should be noted, if the imaging coil of camera lens 5 is contained sizable scope, for example camera lens 5 moves s function when comparatively powerful, usually this type of camera lens imaging coil is just bigger, will avoid shade 3 to enter into by image strip 20 ' formed light cone this moment, otherwise shade 3 just might be seized and be imaged onto on the screen by camera lens 5.This shows, think it a little is that the light path that is to confirm to form distortion light district is to be arranged at the light path that appropriate position will produce the light district that distorts and to stop in advance in the preceding suitable distance of distance digital micro-mirror device by where being about to shade 3 actually for of the present invention, solve the problem of parasitic light at one stroke in the mode of taking away the firewood under the cauldron, rather than comparatively passive mode solves only to use delustring etc. as prior art.
Moreover, also it should be noted, no doubt shade 3 itself needs to handle through delustring, normally be selected from delustring lacquer or plant a kind of disposal route in the hair, the light that but still has minority reflects, so also should note can not be towards camera lens 5 for the direction of shade 3, otherwise might make image become comparatively fuzzy, that is to say that the direction that is provided with of the shade 3 among Fig. 3 is as the criterion light is reflexed to second catoptron, 142 belows.
The place that the present invention is different with prior art is to utilize light that shade 3 will produce distortion light district just to be blocked arriving digital micro-mirror device 2 and on every side preceding thereof, the light that will project digital micro-mirror device 2 completely is limited in the zone of itself, compared with prior art, the present invention is more effective with the distortion CD-ROM drive for eliminating parasitic light.
This case is appointed by the person skilled in the art executing the craftsman to think and is modification miscellaneous, does not so still break away from the protection of this case claim.
Claims (13)
1. projector with shade comprises:
One illuminator in order to this light source of projector to be provided, wherein more comprises:
One light source produces light;
One condenser is in order to this light-ray condensing; And
One catoptron is in order to reflect away this light;
One micro-mirror device (MD) in order to accepting the light that this catoptron reflects, and is gone out in handling back reflection;
One camera lens, in order to accept the light that this micro-mirror device is handled and reflected, this camera lens is with this light focusing imaging; And
One shade is arranged between this micro-mirror device and this illuminator, in order to the parasitic light that this illuminator produced is blocked.
2. projector according to claim 1, it is characterized in that, this catoptron produces a projected area when this light of reflection, comprise an effective lighting district and a distortion light district, wherein this effective lighting fauna is contained this micro-mirror device, and this distortion light district is this parasitic light and be formed on this effective lighting district around, again, more form a projecting light path between this projected area and this catoptron, comprise a formed effective lighting light path between this effective lighting district and this catoptron, and a formed distortion light path between this distortion light district and this catoptron, wherein this shade system is in order to block this distortion light path.
3. projector according to claim 1 is characterized in that, this catoptron more comprises:
One first catoptron is in order to change the direction of this light; And
One second catoptron in order to this light of accepting to be reflected by this first catoptron, and reflexes to this micro-mirror device with this light.
4. according to 1 described projector of claim the, it is characterized in that this shade is a shading baffle plate.
5. projector according to claim 1 is characterized in that, this shade system handles through delustring.
6. projector according to claim 5 is characterized in that, described delustring is handled system and is selected from the delustring lacquer and plants a kind of in the hair.
7. removing method that applies to the parasitic light of projector comprises the following step:
(1) provides an illuminator, in order to this light source of projector to be provided;
(2) provide a micro-mirror device, in order to handling and reflection from the light of this illuminator;
(3) produce a projecting light path between this illuminator and this micro-mirror device;
(4) provide a shade between this illuminator and this micro-mirror device; And
(5) provide a camera lens, in order to receiving by the light that this micro-mirror device reflected, and in addition imaging,
Wherein, this shade system covers up the part of this projecting light path, with the ray cast of avoiding this part periphery to this micro-mirror device.
8. method according to claim 7 is characterized in that, this projecting light path more can be divided into an effective projecting light path and a distortion light path, and is this distortion light path by this part that this shade blocked.
9. micro-mirror device projector, comprise irradiation, the camera lens that an illuminator, a micro-mirror device be subjected to this illuminator and accept light by this micro-mirror device reflected, and with this light focusing imaging, and this projector is characterised in that a shade more is set between this illuminator and this micro-mirror device, in order to the parasitic light that this illuminator produced is blocked.
10. projector according to claim 9, it is characterized in that, more form an effective lighting light path between this illuminator and this micro-mirror device, around this effective lighting light path, then form a distortion light path, wherein this shade system is positioned on this distortion light path, makes the distortion light path can not arrive this micro-mirror device.
11. projector according to claim 9 is characterized in that, this shade is a baffle plate, and the light on the light path that directly will distort keeps off.
12. projector according to claim 9 is characterized in that, this baffle plate is more handled through delustring, and this delustring is handled system and is selected from the delustring lacquer and plants a kind of in the hair.
13. projector according to claim 9 is characterized in that, this micro-mirror device is a digital micro-mirror device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510089508.4A CN1900762A (en) | 2005-07-22 | 2005-07-22 | Projector with light shading device and its stray light clearing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510089508.4A CN1900762A (en) | 2005-07-22 | 2005-07-22 | Projector with light shading device and its stray light clearing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1900762A true CN1900762A (en) | 2007-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510089508.4A Pending CN1900762A (en) | 2005-07-22 | 2005-07-22 | Projector with light shading device and its stray light clearing method |
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| Country | Link |
|---|---|
| CN (1) | CN1900762A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110519524A (en) * | 2019-08-28 | 2019-11-29 | 北京迈格威科技有限公司 | Light filling component, picture shooting assembly, mobile terminal and image pickup method |
-
2005
- 2005-07-22 CN CN200510089508.4A patent/CN1900762A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110519524A (en) * | 2019-08-28 | 2019-11-29 | 北京迈格威科技有限公司 | Light filling component, picture shooting assembly, mobile terminal and image pickup method |
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