CN202929278U - Wide-angle transfer lens and projection system provided therewith - Google Patents
Wide-angle transfer lens and projection system provided therewith Download PDFInfo
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- CN202929278U CN202929278U CN 201220617897 CN201220617897U CN202929278U CN 202929278 U CN202929278 U CN 202929278U CN 201220617897 CN201220617897 CN 201220617897 CN 201220617897 U CN201220617897 U CN 201220617897U CN 202929278 U CN202929278 U CN 202929278U
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- angle transfer
- angle
- transfer lens
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Abstract
The utility model relates to a wide-angle transfer lens and a projection system provided therewith, wherein the wide-angle transfer lens can be used in concert with a main projection lens. The wide-angle transfer lens comprises a first negative-power lens, a second negative-power lens, a third positive-power lens and a fourth positive-power lens. The first, second, third and fourth lenses are sequentially arranged from a projection screen to a display chip and are all a single lens respectively. The first, second, third and fourth lenses are spaced apart through air intervals arranged thereamong. In all, the wide-angle transfer lens comprises eight optical surfaces and three air intervals. The utility model also relates to a projection system provided with the above wide-angle transfer lens. The wide-angle transfer lens has the advantages of small size, low cost, small distortion, telecentric beam path in image space and so on.
Description
Technical field
The utility model relates to a kind of projection display technique, relates in particular to a kind ofly can be used in conjunction with the wide-angle transfer lens that plays the field of view angle function that increases projection and the optical projection system of application thereof with the principal view camera lens.
Background technology
Projector equipment is being played the part of the role who becomes more and more important in modern cultural, business, recreation.In present optical projection system, no matter be to adopt liquid crystal display (Liquid Crystal Display, LCD), liquid crystal on silicon (Liquid Crystal on Silicon, LCOS) or digital processing (Digital Light Procession, the projection theory such as DLP), projection lens is all indispensable important opticses wherein: after the light changing device of light through reflective or penetration, need through projection lens projects imaging to the projection screen.
At present, the requirement also gradually variation of micro projection product to the picture dimension of projection products, and the visual field of conventional lenses fixed focus projection lens is fixing and can't regulate, so need wide-angle transfer lens of design that the visual field is broadened, exactly by the wide-angle transfer lens being appended to the size that changes the projection visual field on the principal view camera lens.Yet existing wide-angle transfer lens is when having increased the visual field size, and distortion and the aberration of the optical projection system that also makes increase accordingly.On principle, although can proofread and correct by more lens numbers the aberration of projection lens, such device manufacturing cost, size and weight also can rise accordingly.
The utility model content
Based on the shortcoming of improving the above present projection lens, the purpose of this utility model is to provide that a kind of size is little, cost is low, the distortion is little and the wide-angle transfer lens of the advantage such as picture Fang Yuanxin.
The utility model wide-angle transfer lens is applied to optical projection system, can be used in conjunction with the principal view camera lens, described wide-angle transfer lens comprises the first lens with negative power, the second lens with negative power, the 4th lens that have the 3rd lens of positive light coke and have positive light coke, the described first, second, third and the 4th lens are arranged sequentially from projection screen to display chip respectively, and be simple lens, the centre separates by the airspace, one has eight optical surfaces, three airspaces.
Compared to prior art, wide-angle transfer lens of the present utility model has been realized the wide-angle translation function by less lens, and have that size is little, cost is low, distortion is little and the series of advantages such as picture Fang Yuanxin.
Description of drawings
Fig. 1 is the optical structure chart of wide-angle transfer lens of the present utility model and system of principal view lens group composite projection.
Fig. 2 is each visual field chip face transport function mtf value of wide-angle transfer lens of the present utility model and system of principal view lens group composite projection, this transfer function values with projection apart from 680mm, 35 cun of projection screens are estimate of situation, the sampling take projection angle as the visual field.Horizontal ordinate is the spatial frequency coordinate, and ordinate is the transport function mtf value.
Fig. 3 is that 0 degree of wide-angle transfer lens of the present utility model and system of principal view lens group composite projection is to the light point range figure of 42 each field angle of degree at the chip face.
Fig. 4 is the curvature of field and the distortion figure of wide-angle transfer lens of the present utility model and system of principal view lens group composite projection.
Fig. 5 is the chromatic longitudiinal aberration figure of wide-angle transfer lens of the present utility model and system of principal view lens group composite projection.
Embodiment
The utility model is described in further detail with embodiment by reference to the accompanying drawings now.
Fig. 1 is the optical structure chart of the utility model optical projection system, as shown in Figure 1, optical projection system comprises principal view camera lens 11 and can be attached to wide-angle transfer lens 12, projection screen 13 and display chip 14 on principal view camera lens 11, and the surface of display chip 14 is to adopt digital display chip DMD module.The structure of the principal view camera lens 11 in the present embodiment is exemplary, and principal view camera lens 11 is not limited to the structure in the present embodiment.
As shown in Figure 2, wide-angle transfer lens 12 comprises the first lens 121 with negative power, the second lens 122 with negative power, the 4th lens 124 that have the 3rd lens 123 of positive light coke and have positive light coke.First, second, third, fourth lens 121,122,123,124 respectively from projection screen 13 to display chip 14 directions arranged sequentially, and these four lens 121,122,123,124 are all simple lenses, the centre separates by three airspaces, and one has eight optical surfaces 1,2,3,4,5,6,7,8.Wherein, first lens 121 is meniscus shape, and convex surface 1 is towards projection screen 13 directions.The second lens 122 are plano-concave negative power lens, concave surface 4 is towards diaphragm 15 directions, such structure makes the bigbore light of wide-angle move towards can be rationally level and smooth, produces senior aberration thereby turning angle is unlikely to too violent, and have less tolerance sensitivity.The 3rd lens 123 are bent moon positive light coke lens, the 3rd lens 123 connect two of fronts negative lens 121,122, light angle is further dwindled, and the radius-of-curvature towards the surface 5 of projection screen 13 directions of the 3rd lens 123 can be less than the surface 6 towards diaphragm 15 directions.
Realize the increase projection angle according to the wide-angle transfer lens 12 of the present embodiment, and effective controlled the aberration serious because the projection visual field increases and the impact of distortion.
Satisfy following inequality according to the wide-angle transfer lens 12 of the utility model embodiment:
VD2?≥?45?(1)
Wherein VD2 is the Abbe number of the second lens 122.When as the Abbe number of the second lens 122 selection materials of negative lens greater than 45 the time, can effectively compensate the aberration under large visual field.
Satisfy following inequality according to the wide-angle transfer lens 12 of the utility model embodiment:
1.5≤(r1+r2)/(r1-r2)≤2.45?(2）
Wherein, r1 is the radius-of-curvature of first lens 121 close projection screens 13, and r2 is that first lens 121 is near the radius-of-curvature of display chips 14.
Inequality (2) defines the shape of first lens 121, and such shape can be smoother when making wide-angle optics enter camera lens.
In addition, the wide-angle transfer lens 12 according to the utility model embodiment also satisfies following inequality:
0.53≤WEFL/MEFL≤0.7?（3）
Wherein, MEFL is the effective focal length of principal view camera lens 11, and WEFL is the combined focal length of principal view camera lens 11 and wide-angle transfer lens 12.
Inequality (3) defines the visual field of principal view camera lens 11 by the degree of wide-angle transfer lens 12 changes, the ratio of WEFL/MEFL is less, the degree that changes is larger, the aberration effects that this time, introduced large visual field is also more serious, need the more variable of corresponding introducing in order to proofread and correct Off-axis aberrations, thereby need to increase the quantity of camera lens, make system more complicated, make larger, heavier that the structure of wide-angle transfer lens 12 also becomes.
In the present embodiment, the first lens 121 of wide-angle transfer lens 12 has used aspheric surface, uses following formula to characterize aspheric surface face type:
| The face order | 1 |
| K | 4.825 |
| a1 | 0 |
| a2 | 2.409782e-004 |
| a3 | -1.918180e-006 |
| a4 | 5.965506e-009 |
| a5 | -4.452390e-012 |
| The face order | 2 |
| k | -1.765 |
| a1 | 0 |
| a2 | 3.836830e-004 |
| a3 | 5.069648e-008 |
| a4 | -3.647500e-008 |
| a5 | 2.109658e-010 |
Aspheric use, can more effective correction large the visual field distortion and the Off-axis aberrations that cause.
In addition, the arrangement of materials of each lens of wide-angle transfer lens 12 described in the utility model is as follows:
Wherein, first lens 121 adopts the PMMA optical resin material, and density is lighter, and makes the cost of injection mo(u)lding lower, is conducive to produce in enormous quantities.The second lens 122 adopt high index of refraction, high Abbe number flint glass, and high index of refraction makes the surface curvature of lens be unlikely to too little, is in zone of reasonableness, and high Abbe number makes effectively correcting chromatic aberration of negative power the second lens 122.The 3rd lens 123 are positive lens, adopt the high index of refraction flint glass, make glass surface curvature reasonable.The 4th lens 124 adopt low-refraction high Abbe number crown glass, further optimize aberration.
Below provide embodiment data of wide-angle transfer lens 12 described in the utility model:
Wavelength: 445nm-532nm-640nm
Full field angle: 84 °
Combination projection ratio: 0.9
Principal view lens focus: 7.513mm
Wide-angle transfer lens and principal view lens group complex focus: 4.45mm
Image height: 7.9mm
Picture side F/#:3.2
Structured data:
| The face order | Radius-of-curvature | Thickness | Refractive index | Abbe number | Bore |
| 1 | 38.057 | 2 | 1.49 | 57.4 | 26.1 |
| 2 | 11.996 | 6.66 | 20.0 | ||
| 3 | -559.175 | 1.80 | 1.80 | 46.6 | 19.5 |
| 4 | 11.039 | 2.43 | 16.0 | ||
| 5 | 22.481 | 4.00 | 1.85 | 23.8 | 16.0 |
| 6 | 72.763 | 0.99 | 15.5 | ||
| 7 | 11.149 | 4.50 | 1.49 | 70.4 | 15.5? |
| 8 | -220.308 | 2.80 | 14.0 | ||
| 9 | 14.612 | 1.94 | 1.64 | 60.2 | 10.0 |
| 10 | 997.741 | 0.15 | 9.0 | ||
| 11 | 5.466 | 1.27 | 1.81 | 25.5 | 6.6 |
| 12 | 6.468 | 0.92 | 1.49 | 70.4 | 5.4 |
| 13 | 2.03 | 1.51 | ? | ? | 3.2 |
| Stop | Infinity | 0.28 | 1.8 | ||
| 15 | -9.788 | 2.74 | 1.85 | 23.8 | 2.1 |
| 16 | 28.278 | 2.10 | 1.50 | 81.6 | 4.9 |
| 17 | -4.004 | 1.36 | ? | ? | 5.8 |
| 18 | -33.395 | 1.80 | 1.61 | 58.6 | 8.0 |
| 19 | -8.761 | 0.20 | ? | ? | 8.6 |
| 20 | 26.832 | 1.90 | 1.62 | 58.1 | 9.4 |
| 21 | -18.379 | 1.00 | ? | ? | 9.4 |
| 22 | Infinity | 7.40 | 1.65 | 33.8 | 9.1 |
| 23 | Infinity | 1.00 | ? | ? | 8.3 |
| 24 | Infinity | 0.70 | 1.5 | 64.2 | 8.1 |
| SI | Infinity | 3.997 |
Fig. 2 is each visual field chip face transport function mtf value schematic diagram that wide-angle transfer lens 12 of the present utility model and principal view camera lens 11 are combined into optical projection system, this transfer function values with projection apart from 680mm, 35 cun of projection screens are estimate of situation, the sampling take projection angle as the visual field.Horizontal ordinate is the spatial frequency coordinate, and ordinate is the transport function mtf value.
Fig. 3 is that wide-angle transfer lens 12 of the present utility model is combined into 0 degree of optical projection system to the light point range figure of 42 each field angle of degree at the chip face with principal view camera lens 11.The root mean square radius of point range figure should be less than display chip pixel size 7.5um.
Fig. 4 is the curvature of field and the distortion figure that wide-angle transfer lens 12 of the present utility model and principal view camera lens 11 are combined into optical projection system.As can be seen from the figure maximum distortion is 1.6%.
Fig. 5 is the chromatic longitudiinal aberration figure that wide-angle transfer lens 12 of the present utility model and principal view camera lens 11 are combined into optical projection system.Transverse axis represents the aberration size, and the longitudinal axis represents the visual field.
Because the utility model has been realized the wide-angle translation function by less lens, therefore simple in structure, size is less and manufacturing cost is lower.
Although with reference to preferred implementation of the present utility model, the utility model is illustrated and describes.But; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (10)
1. wide-angle transfer lens, being applied to optical projection system can be used in conjunction with the principal view camera lens, comprise the first lens with negative power, the second lens with negative power, the 4th lens that have the 3rd lens of positive light coke and have positive light coke, the described first, second, third and the 4th lens are arranged sequentially from projection screen to display chip respectively, and be simple lens, the centre separates by the airspace, and one has eight optical surfaces, three airspaces.
2. wide-angle transfer lens as claimed in claim 1, it is characterized in that: described first lens is meniscus shape, and convex surface is towards the projection screen direction, second lens is plano-concave negative power lens, concave surface is towards the diaphragm direction, thereby make the bigbore light of the wide-angle trend can be rationally level and smooth, produce senior aberration thereby turning angle is unlikely to too violent, and have less tolerance sensitivity.
3. wide-angle transfer lens as claimed in claim 2, it is characterized in that: described the 3rd lens are bent moon positive light coke lens, the 3rd lens connect first, second lens of front, light angle is further dwindled, and the radius-of-curvature towards the surface of projection screen direction of the 3rd lens can be less than the surface towards the diaphragm direction.
4. wide-angle transfer lens as claimed in claim 3, it is characterized in that: described the 4th lens are plano-convex positive light coke lens, and convex surface is towards projection screen, and the plane is towards diaphragm.
5. wide-angle transfer lens as claimed in claim 1, it is characterized in that: inequality: VD2 below described wide-angle transfer lens satisfies 〉=45, wherein VD2 is the Abbe number of the second lens, when as the Abbe number of the second lens selection material of negative lens greater than 45 the time, can effectively compensate the aberration under large visual field.
6. wide-angle transfer lens as claimed in claim 1, it is characterized in that: inequality below described wide-angle transfer lens satisfies: 1.5≤(r1+r2)/(r1-r2)≤2.45, wherein, r1 is the radius-of-curvature of the close projection screen of first lens, r2 is that first lens is near the radius-of-curvature of display chip, inequality defines the shape of first lens, and such shape can be smoother when making wide-angle optics enter camera lens.
7. wide-angle transfer lens as claimed in claim 1, it is characterized in that: inequality: 0.53≤WEFL/MEFL below described wide-angle transfer lens satisfies≤0.7, wherein, MEFL is the effective focal length of principal view camera lens, WEFL is the combined focal length of main lens and wide-angle transfer lens, inequality defines the degree that the visual field of principal view camera lens is changed by the wide-angle transfer lens, and the ratio of WEFL/MEFL is less, and the degree that changes is larger.
8. wide-angle transfer lens as claimed in claim 1, it is characterized in that: the arrangement of materials of described each lens is as follows: first lens adopts the PMMA optical resin material; The second lens adopt the flint glass of high index of refraction, high Abbe number, and wherein high index of refraction makes the surface curvature of lens be unlikely to too little, is in zone of reasonableness, and high Abbe number makes effectively correcting chromatic aberration of negative power the second lens.
9. wide-angle transfer lens as claimed in claim 8 is characterized in that: described the 3rd lens adopt the flint glass of high index of refraction, make glass surface curvature reasonable; The 4th lens adopt low-refraction high Abbe number crown glass, further optimize aberration.
10. optical projection system, the wide-angle transfer lens as claimed in claim 1, projection screen and the display chip that comprise a principal view camera lens, be used in conjunction with the principal view camera lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220617897 CN202929278U (en) | 2012-11-20 | 2012-11-20 | Wide-angle transfer lens and projection system provided therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220617897 CN202929278U (en) | 2012-11-20 | 2012-11-20 | Wide-angle transfer lens and projection system provided therewith |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202929278U true CN202929278U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220617897 Expired - Fee Related CN202929278U (en) | 2012-11-20 | 2012-11-20 | Wide-angle transfer lens and projection system provided therewith |
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| Country | Link |
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| CN (1) | CN202929278U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707673A (en) * | 2015-11-17 | 2017-05-24 | 芋头科技（杭州）有限公司 | Projection system |
| CN110031952A (en) * | 2019-04-26 | 2019-07-19 | 莆田学院 | The external optical system of mobile lens |
-
2012
- 2012-11-20 CN CN 201220617897 patent/CN202929278U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707673A (en) * | 2015-11-17 | 2017-05-24 | 芋头科技（杭州）有限公司 | Projection system |
| CN110031952A (en) * | 2019-04-26 | 2019-07-19 | 莆田学院 | The external optical system of mobile lens |
| CN110031952B (en) * | 2019-04-26 | 2021-01-12 | 莆田学院 | External optical system of mobile phone lens |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20141120 |
|
| EXPY | Termination of patent right or utility model |