CN204964858U - Exempt from to focus projection objective and projecting apparatus based on wavefront code - Google Patents
Exempt from to focus projection objective and projecting apparatus based on wavefront code Download PDFInfo
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- CN204964858U CN204964858U CN201520730071.7U CN201520730071U CN204964858U CN 204964858 U CN204964858 U CN 204964858U CN 201520730071 U CN201520730071 U CN 201520730071U CN 204964858 U CN204964858 U CN 204964858U
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Abstract
The utility model discloses an exempt from to focus projection objective and projecting apparatus based on wavefront code is including coding board and projection objective group. The formation of image is amplified with the object by projection objective group, and the image that obtains is the code before the coding board wave train, realizes not focusing at great projector distance within range forming for instance clear. Compare traditional projection objective, the utility model discloses an exempt from the projection objective that focuses, do not need adjustment lens real cut -off distance or focus, also do not need extra electronics rectifying system, only adopted a wavefront coding board for when the structure is more oversimplified, in the great projector distance within range clarity that can all form images. The whole simple structure of projection objective system, the small and exquisite compactness of size, low in manufacturing cost has the advantage of high optical efficiency, high uniformity and high contrast simultaneously, and is radiationless, and green is suitable for the large -scale production.
Description
Technical field
The utility model belongs to projection display technique field, particularly relates to a kind ofly to exempt from based on wavefront coded projection objective of focusing.
Background technology
The principle of projector's display image is first irradiated on image-display units by light to produce image, be projected on screen finally by projection objective, and can maintain a certain distance between projection objective and screen, projector distance is larger, and the picture that screen obtains is larger.General tight shot, the clear picture of specific size can only be become a specific distance, want the clear picture obtaining other size, just need to select to coordinate suitable projection lens, therefore, how can within the scope of a larger projector distance blur-free imaging, being applicable to most of user and using, is one of main points of projection lens research.At present, traditional projector generally adopts and regulates the mode of back focal plane position or zoom to increase the projector distance scope that system becomes sharply defined image.Adopt and regulate the method for back focal plane position to increase projector distance scope, make the complex structure of system, and add processing cost and installation difficulty.Adopt the mode of zoom to increase projector distance scope, the structure of system is more complicated.
CN201020693871.3 discloses a kind of large depth of field fixed focus projection lens, the object plane adopting the focusing object distance place required by actual working environment is the method for designing of benchmark, expand the system depth of field, and system architecture is comparatively easy, but can only in a less projector distance scope blur-free imaging.
CN201010013717.1 discloses a kind of phase-plate and applies the field depth extension imaging system of this phase-plate, by adding the phase-plate of one piece of cube type on the aperture plane of system, entrance pupil or emergent pupil, the modulation transfer function of system can become to out of focus and the factor that caused by out of focus insensitive, thus expand the depth of field of system.But need, through extra digital image restoration algorithm, finally just can obtain picture rich in detail through the imaging system of this utility model, and just expanded the depth of field of imaging system, do not enlarge markedly the projector distance scope of imaging lens.
Utility model content
For the defect existed in prior art and deficiency, the utility model proposes and a kind ofly exempt from focusing projection objective and projector based on wavefront coded.Wavefront coding technology inserts the wavefront of a block forecast plate to optical system at the pupil plane of optical system to modulate, make within the scope of larger projector distance, its optical transfer function MTF or point spread function PSF constant or to projector distance change insensitive, thus realize screen can obtain within the scope of larger projector distance when not focusing clearly as.
Described exempts from based on wavefront coded projection objective of focusing, and does not need to regulate back focal plane, does not need extra electronics correction system, can become picture rich in detail on projector distance (as 0.5 meter to 5 meters) in a big way.
Technical scheme is as follows.
Exempt from based on wavefront coded a projection objective of focusing, comprise encoding board and projection objective group, encoding board is positioned on the diaphragm face of projection objective group, and encoding board 1 one side be positioned on diaphragm meets XY polynomial expression, and its equation is:
Wherein, a
n, b
nfor the parameter of above-mentioned encoding board equation, realize, within the scope of projector distance, not focusing, projection screen can obtain clear drawing.
Described projector distance is 0.5 meter to 5 meters, also can be designed to other according to specific requirement.
Described encoding board, one side can be sphere or aspheric surface in addition.
The material of described encoding board is optical-grade plastic or optical glass.
Described projection objective group comprises micro display chip, refractive prism and projection eyeglass successively along light transmition direction.Encoding board is coaxial with projection objective.
Described micro display chip is DMD, LCoS or LCD.
Described refractive prism is PBS prism or TIR prism.
Described projection objective group number is according to concrete chip resolution Demand Design.
The lens materials of described projection objective group is sphere or aspheric surface.
A kind of projector, exempts from projection objective of focusing described in employing.
The beneficial effects of the utility model are: image is after projection objective, do not need adjustable lens rear cut-off distance or focal length, extra electronics correction system is not needed yet, use only one block of wavefront coded plate, just can realize within the scope of larger projector distance can blur-free imaging, is applicable to most of user and uses.And the structure of wavefront coded plate is simple, is easy to processing, makes whole projection objective system structure simple; compact size is compact, low cost of manufacture, has the advantage of specular removal rate, high uniformity and high-contrast simultaneously; radiationless, environmental protection, is very suitable for large-scale production.
Accompanying drawing explanation
Fig. 1 is that a kind of LCOS exempts from focusing micro projection photo engine;
Fig. 2 is that a kind of DMD exempts from focusing micro projection photo engine;
Fig. 3 is for exempting from projection objective of focusing;
Fig. 4 is the MTF curve of exempting from the focusing projection objective different visual field sagitta of arc and meridian direction at 5 meters of projector distance places;
Fig. 5 is the MTF curve of the conventional projection object lens different visual field sagitta of arc and meridian direction at 5 meters of projector distance places;
Fig. 6 is for exempting from focusing projection objective projector distance 0.5 meter to 5 meters, and 30 lines are right/millimeter place, the MTF curve of the different visual fields sagitta of arc and meridian direction;
Fig. 7 be conventional projection object lens projector distance 0.5 meter to 5 meters, 30 lines are right/millimeter place, the MTF curve of the different visual fields sagitta of arc and meridian direction;
Fig. 8 exempts from the point range figure of focusing projection objective at projector distance 5 meters of;
Fig. 9 exempts from the point range figure of focusing projection objective at projector distance 2 meters of;
Figure 10 exempts from the point range figure of focusing projection objective at projector distance 0.5 meter of.
Embodiment
Below in conjunction with Figure of description, the utility model is described further:
A kind of application that the utility model proposes wavefront coded exempts from projection objective of focusing, by introducing on the diaphragm face of conventional projection object lens, there is wavefront coded encoding board, open up to a great extent and prolonged the projector distance scope that projector becomes sharply defined image, and the structure of system is simple.
Fig. 1 is that a kind of LCOS exempts from focusing micro projection photo engine, by LED light source 11, collimation lens and relay lens group 12, miniature display chip LCOS21, PBS prism 22, exempts from focusing projection objective 23 and forms, the light that LED sends incides on LCOS micro display chip after collimating mirror and relay lens group to be lighted LCOS chip image, image on last LCOS, after exempting from focusing projection objective group amplification imaging, within the scope of the projector distance of 5 meters to 0.55 meter, can become sharply defined image.
Fig. 2 is that a kind of DMD exempts from focusing micro projection photo engine, by LED light source 11, collimation lens and relay lens group 12, miniature display chip DMD31, TIR prism 32, exempts from focusing projection objective 33 and forms, the light that LED sends incides on DMD micro display chip after collimating mirror and relay lens group, image on last DMD, after exempting from focusing projection objective, within the scope of the projector distance of 5 meters to 0.55 meter, can become sharply defined image.
Figure 3 shows that and a kind ofly exempt from based on wavefront coded projection objective of focusing, comprise encoding board 1 and projection objective group 2,
F/2.0, effective focal length 15mm, in embodiment, the mathematic(al) representation of encoding board 1 is:
Exempt from focusing projection objective at 5 meters of projector distance places, the sagitta of arc of different visual field and the modulation transfer function curve of meridian direction are as shown in Figure 4; Shown in Fig. 5 be conventional projection object lens at 5 meters of projector distance places, the sagitta of arc of different visual field and the modulation transfer function curve of meridian direction.
Fig. 4 is visible, exempt from focusing projection objective on 5 meters of projector distances, 0 visual field, 0.3 visual field, 0.7 visual field and the sagitta of arc of full filed and the modulation transfer function goodness of fit of meridian direction fine, with the increase of spatial frequency, MTF numerical value reduces gradually, and 30 lines right/millimeter place still can reach more than 0.2.
Fig. 5 is visible, and conventional projection object lens are at 5 meters of projector distance places, and modulation transfer function obviously reduces along with the increase of spatial frequency, wherein, the sagitta of arc MTF of 0.7 visual field and full filed 27 lines right/millimeter place close to 0, now, projection objective can not blur-free imaging.
Figure 6 shows that: exempt from focusing projection objective projector distance 0.5 meter to 5 meters, 30 lines are right/millimeter place, 0 visual field, 0.3 visual field, 0.7 visual field and the sagitta of arc of full filed and the modulation transfer function curve of meridian direction.In figure, mtf value remains between 0.2 to 0.5, and numerical value is higher, and there is not zero point, and namely within the scope of 0.5 meter to 5 meters projector distance, it is very little and substantially identical to exempt from the focusing aberration of projection objective on screen, and screen can obtain picture rich in detail.
Fig. 7 be conventional projection object lens projector distance 0.5 meter to 5 meters, 30 lines are right/millimeter place, 0 visual field, 0.3 visual field, 0.7 visual field and the sagitta of arc of full filed and the modulation transfer function curve of meridian direction.In figure, at projector distance 0.5 meter of, the mtf value of different visual fields sagitta of arc meridian direction is almost 0, can not imaging; At 2 meters of projector distance places, the mtf value of the sagitta of arc meridian direction of different visual field increases to 0.8, imaging clearly, and that is, conventional projection object lens can only become sharply defined image at a projector distance place, can not become sharply defined image in other position.
Fig. 8,9 and 10 is respectively and exempts from focusing projection objective at the point range figure at 5 meters, 2 meters and 0.5 meter, and show in figure: different projector distance place, the aberration of each visual field is substantially identical.
Above embodiment is described the utility model; but; these should not described and be interpreted as a kind of restriction situation; for a person skilled in the art with reference to obviously making the various improvement in disclosed embodiment and other embodiment to description of the present utility model above; all according to the conversion done by design of the present utility model, all belong to protection domain of the present utility model.
Claims (10)
1. exempt from based on wavefront coded projection objective of focusing for one kind, it is characterized in that: comprise encoding board (1) and projection objective group (2), encoding board (1) is positioned on the diaphragm face of projection objective group (2), and the one side that encoding board (1) is positioned at diaphragm face meets XY polynomial expression, and its equation is:
Wherein, a
n, b
nfor the parameter of above-mentioned encoding board (1) equation, realize, within the scope of projector distance, not focusing, projection screen can obtain clear drawing.
2. according to claim 1 exempt from focus projection objective, it is characterized in that: described projector distance is 0.5 meter to 5 meters.
3. according to claim 1 exempt from focus projection objective, it is characterized in that: described encoding board (1), in addition one side can be plane, also can be sphere or aspheric surface.
4. according to claim 1 exempt from focus projection objective, it is characterized in that: the material of described encoding board (1) is optical-grade plastic or optical glass.
5. according to claim 1 exempt from focus projection objective, it is characterized in that: described projection objective group (2) comprises micro display chip, refractive prism and projection eyeglass successively along light transmition direction.
6. according to claim 5 exempt from focus projection objective, it is characterized in that: described micro display chip is DMD, LCoS or LCD.
7. according to claim 5 exempt from focus projection objective, it is characterized in that: described refractive prism is PBS prism or TIR prism.
8. according to claim 5 exempt from focus projection objective, it is characterized in that: described projection objective group (2) number can according to concrete chip resolution Demand Design.
9. according to claim 5 exempt from focus projection objective, it is characterized in that: the lens materials of described projection objective group (2) is sphere or aspheric surface.
10. a projector, is characterized in that: adopt as described in any one of claim 1-9 exempt from focus projection objective.
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| CN201520730071.7U CN204964858U (en) | 2015-09-21 | 2015-09-21 | Exempt from to focus projection objective and projecting apparatus based on wavefront code |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116518A (en) * | 2015-09-21 | 2015-12-02 | 浙江水晶光电科技股份有限公司 | Wavefront coding based focus-free projection lens and projector |
| CN106248692A (en) * | 2016-08-04 | 2016-12-21 | 中国科学院长春光学精密机械与物理研究所 | A kind of method of micro-imaging field depth extending and microscopic imaging device |
-
2015
- 2015-09-21 CN CN201520730071.7U patent/CN204964858U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116518A (en) * | 2015-09-21 | 2015-12-02 | 浙江水晶光电科技股份有限公司 | Wavefront coding based focus-free projection lens and projector |
| CN106248692A (en) * | 2016-08-04 | 2016-12-21 | 中国科学院长春光学精密机械与物理研究所 | A kind of method of micro-imaging field depth extending and microscopic imaging device |
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