CN100432736C - 90-degree turning rear-projection object lens - Google Patents
90-degree turning rear-projection object lens Download PDFInfo
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- CN100432736C CN100432736C CNB2005100351009A CN200510035100A CN100432736C CN 100432736 C CN100432736 C CN 100432736C CN B2005100351009 A CNB2005100351009 A CN B2005100351009A CN 200510035100 A CN200510035100 A CN 200510035100A CN 100432736 C CN100432736 C CN 100432736C
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Abstract
The present invention relates to a back-projection object lens which can rotate by 90 DEG. The present invention has the main structure that: a. a crescent negative glass lens and a crescent negative PMMA single-side aspheric lens form the front element of the negative focal power of the object lens, and sphere centers face a diaphragm surface; b. a set of lenses of which the focal power is negative, positive, positive, negative, positive, negative and positive respectively form the rear element of the positive focal power of the object lens, and the diaphragm surface is arranged between a prepositive negative lens and a positive lens to enable an entrance pupil to be coincident with the object focus of a system; c. the front element of the negative focal power a and the rear element of the positive focal power b are arranged to form an angle of 90 DEG, and a planar reflective mirror between the front element and the rear element is arranged to form an angle of 45 DEG with the optical axial cord of the front element and the optical axial cord of the rear element.
Description
Technical field
The present invention relates to the projection objective in the back projection equipment, mainly be meant a kind of angle turning rear-projection object lens that turn 90 degrees.
Background technology
Projection objective is one of back projection digital television core component, and it is image planes with liquid crystal silicon projection display LCOS chip, is object plane with the Fresnel projection screen, and its structure and quality will directly have influence on the effect of rear-projection.For guaranteeing that object lens can reach the requirement of high imaging quality, should satisfy some optical property index, as distort evenly, the relatively geometric configuration etc. of little, rational eyeglass of short focal length, long rear cut-off distance, high magnification, high resolving power, illuminance of image plane.Known projection objective, its structure mostly is straight barrel type, and its lens numbers is generally more than 11, and these class object lens are owing to exist unreasonable structure, reasons such as lens numbers is more cause the thickness of casing big, defective such as image sharpness is very poor, image illumination uniformity is poor, distortion is arranged, coloured limit.Therefore, limited the development of rear-projection technology.
The patent No. is 02215401.9 utility model patent, discloses a kind of turning rear-projection object lens, and these object lens belong to straight barrel type, before comprising, its structure on the lens barrel eyeglass 3a-3b is housed, eyeglass 4a-4e is housed on the back lens barrel, and wherein eyeglass 3a is a double-sized non-spherical PMMA plastic sheet, and other is glass mirror.
Summary of the invention
The purpose of this invention is to provide a kind of angle turning rear-projection object lens that turn 90 degrees,, make LCOS back projection Digital Television realize that ultrathin type, giant-screen, high definition become possibility in order to overcome the defective that existing projection objective exists.
Realize that technical scheme of the present invention is: turn 90 degrees the angle turning rear-projection object lens, comprise before the object lens group, plane mirror, connecting cylinder, lens barrel behind group, the object lens, place successively in order behind the shadow screen, its primary structure is:
A. a falcate negative film glass lens and a falcate PMMA plastic cement negative film single face non-spherical lens constitute the preceding group of negative power of object lens, and this non-spherical lens concave surface is an aspheric surface, and the said lens centre of sphere is all towards the diaphragm face;
B. one group of focal power is respectively negative. just. just. negative. just. and negative. organize behind the positive light coke of positive eyeglass formation object lens, the diaphragm face of this set of contact lenses is located between first pair of negative eyeglass and the positive eyeglass, and the focus in object space of entrance pupil and system is overlapped;
C. group is an angle of 90 degrees setting behind preceding group of above-mentioned a negative power and the b positive light coke, and another plane mirror is organized optical axis with preceding group of optical axis and back and become the miter angle setting.
This technical scheme also comprises 1＞| f
Before|/| f
After|＞0.79, | f
Before| be the absolute value of group focal length before the object lens, | f
After| be the absolute value of group focal length behind the object lens;
4＞| f
Before|/| f
Always|＞3.8, | f
Always| be the absolute value of the total focal length of object lens;
D01/f
Always＜10, D01 is effective clear aperature of object lens first eyeglass in the formula, f
AlwaysTotal focal length for object lens;
BFL/f is total＞and 4.9, BFL is the aerial rear cut-off distances of object lens in the formula;
1068＜TTL＜1180mm, in the formula TTL be the LCOS chip to the distance between the projection screen, LCOS is a liquid crystal on silicon;
LCOS chip diagonal line is 0.7 o'clock, and the diagonal line of projection screen picture is 65 o'clock;
Positive eyeglass in the eyeglass of object lens b group, according to the order that distributes from shadow screen back respectively: second positive lens materials adopts nd=1.4874, vd=70.04; The material of the 3rd the 4th positive eyeglass adopts nd=1.497, vd=81.6; (nd is the Abbe coefficient for glass refraction .vd) Extra-low Dispersion optical glass is made;
Distance from objective front surface to the mirror reflection surface center is less than 80mm; Distance from the object lens rear surface to the mirror reflection surface center is less than 155mm.
The present invention compared with prior art, its superiority is: 1. lacking focal length, is 8.54 to 9.85 millimeters; 2. growing rear cut-off distance, is 44 to 49.145 millimeters so that arrange color-combination prism and associated components preferably; 3. high magnification is as/thing＞95 times; 4. high resolving power is greater than every millimeter 62 pairs of lines (distinguishable pixel is 0.0081 millimeter); 5. the edge aberration is less than 0.5 pixel; 6. image illumination uniformity＞85%; 7. distort relatively less than 0.5%; 8. field angle 2w can reach 92.5 degree, is super wide-angle lens; 9. because changeed an angle of 90 degrees, reasonably geometric configuration makes rear-projection TV realize ultrathin type; 10. the geometric configuration of rational eyeglass has good manufacture craft; 11. less eyeglass quantity can reduce cost of manufacture, increases the transmitance of light; 12. from objective front surface to the mirror reflection surface center less than 80 millimeters, from the object lens rear surface to the mirror reflection surface center less than 155 millimeters.
Description of drawings
Fig. 1 is a general structure synoptic diagram of the present invention, wherein (1) glass lens, (2) plastic cement PMMA non-spherical lens, (3)-(9) eyeglass, (10) reflective mirror, (11) connecting cylinder, (12) lens barrel.
Fig. 2-Fig. 7 is the curve map of embodiment 1.
Fig. 8-Figure 13 is the curve map of embodiment 2.
Bilingual explanation in the accompanying drawing:
Polychromatic diffraction MTF mixed light modulation transfer function
Modulus of The OTF optical transfer function ratio
Spatial frequency in cycles per millimeters spatial frequency millimeter
The TS:T meridian .S sagitta of arc
Fig. 3, Fig. 9
Spot diagram spot chart
Surface:IMA (face: image height)
Fig. 4, Figure 10
Transverse ray fan plot light fan figure:
Fig. 5, Figure 11
Field curvature the Distortion curvature of field the distortion
MILLIMETERS: millimeter
PERCENT: number percent
TS (the T meridian .S sagitta of arc .)
Fig. 6, Figure 12
Field in millimeters linear field millimeter unit
The corresponding illumination of Relative illumination
Fig. 7, Figure 13
Lateral color side color
The microns micron
8.922 millimeters of maximum field 8.922millimeters visual fields
AIRY: Ai Li
Embodiment
Embodiment 1: a kind of angular projection object lens that turn 90 degrees, its structure is used 9 eyeglasses as shown in Figure 1 altogether, and wherein eyeglass (2) is a plastic cement PMMA eyeglass (concave surface is an aspheric surface), eyeglass (7), (8) are two glue pellet, and the light hurdle is located at and makes entrance pupil and system's front focus overlap between (3), (4).The diaphragm clear aperature is 21.33 millimeters.The parameter of system is listed in table 1.
Table 1
| The face sequence number | Radius | At interval | Nd\vd | Clear aperature |
| [1] | 65.399 | 2.84 | 1.6385\55.48 | 83.4 |
| [2] | 32.808 | 17.5 | 62.6 | |
| [3] | 75.62 | 4.73 | 1.49175\57.44 | 62.6 |
| [4]* | 20.193 | 99 | 51.8 | |
| [5] | 68.945 | 3.78 | 1.7725\49.6 | 25 |
| [6] | 32.059 | 29.298 | 23.4 | |
| [Stop] | Infinity | 2.815 | 22.9 | |
| [8] | 114.632 | 3.78 | 1.84666\23.8 | 25.07 |
| [9] | -114.632 | 36 | 25.6 | |
| [10] | 95.47 | 5.4 | 1.4874\70.04 | 30.2 |
| [11] | -56.819 | .189 | 30.2 | |
| [12] | 94.738 | 2 | 1.8061\40.7 | 30.2 |
| [13] | 21.374 | 0.206 | 27.4 | |
| [14] | 22.075 | 14.4 | 1.497\81.6 | 27.4 |
| [15] | -16.932 | 2 | 1.8061\40.7 | 27.4 |
| [16] | -138.595 | 0.2 | 30.2 | |
| [17] | 159.763 | 8.6 | 1.497\81.6 | 32 |
| [18] | -25.064 | 44.06 | 32 | |
| [IMA] | Infinity |
Annotate: band * face is an even number time power aspheric surface, and radius refers to the primitive radius, its aspheric surface parameter
k D E F G
-0.8 -.30804006e-07 -.176393420e-10 -.27769313e-13 -.25066177e-16
K is the conic section constant in the aspheric surface equation, and D, E, F, G represent biquadratic in the aspheric surface equation, six powers, eight power, ten power coefficients respectively.
The object lens performance characteristic: focal length is 8.54mm, and rear cut-off distance is 44.06mm, and relative aperture is 1/2.46, and lens length is from objective front surface to the mirror reflection surface center 78 millimeters, to the mirror reflection surface center 154.5 millimeters from the object lens rear surface.
Projector distance is 768mm, and field angle is 92.5 degree.
The object lens analytical characteristic is shown in table 2:
Table 2
| D01 (mm) | BFL (mm) | |f Before| (mm) | |f After| (mm) | |f Always| (mm) | |f Before| /|f After| | |F Before| /|f Always| | D01/| f Always| | BFL/|f Always| |
| 83.4 | 44.06 | -33.2 | 41.806 | 8.54 | .794 | 3.9 | 9.72 | 5.16 |
Embodiment 2: a kind of angular projection object lens that turn 90 degrees, and the aperture of the diaphragm is 23.92, each relevant data is listed in table 3
Table 3
| The face sequence number | Radius | At interval | Nd/vd | Clear aperature |
| [1] | 64.218 | 3 | 1.6204\60.29 | 74.8 |
| [2] | 29.883 | 18.68 | 56.5 | |
| [3] | 88.90 | 5 | 1.49175\57.44 | 56.5 |
| [4]* | 27.099 | 78.58 | 55 |
| [5] | 50.263 | 4 | 1.7859\44.2 | 26 |
| [6] | 25.781 | 36.399 | 23.7 | |
| [Stop] | Infinity | 1.2 | 23.92 | |
| [8] | 137.723 | 4 | 1.84666\23.8 | 25 |
| [9] | -117.929 | 32.51 | 25.63 | |
| [10] | 1928.245 | 6.5 | 1.497\81.6 | 33 |
| [11] | -46.163 | .2 | 33 | |
| [12] | 77.57 | 3 | 1.8061\40.7 | 33 |
| [13] | 22.596 | 0.218 | 29.4 | |
| [14] | 23.407 | 15 | 1.497\81.6 | 29.4 |
| [15] | -17.722 | 2.2 | 1.8061\40.7 | 29.4 |
| [16] | -133.15 | .2 | 33 | |
| [17] | 168.133 | 9.5 | 1.497\81.6 | 33 |
| [18] | -26.635 | 49.145 | 33.6 | |
| [IMA] | Infinity |
Identical in table 1
k D E F G
-3.1.8078049e-07 -.16382414e-10.1108075e-13.73534578e-16
K is the conic section constant in the aspheric surface equation, and D, E, F, G represent biquadratic in the aspheric surface equation, six powers, eight power, ten power coefficients respectively.
The object lens performance characteristic: focal length is 9.85mm, and rear cut-off distance is 49.145mm, and relative aperture is 1/2.45, and lens length is from objective front surface to the mirror reflection surface center 67.26 millimeters, to the mirror reflection surface center 152.96 millimeters from the object lens rear surface.Projection is apart from being 898.4mm, and field angle is 84.3 degree.
The object lens analytical characteristic is shown in table 4:
Table 4
| D01 (mm) | BFL (mm) | | f Before| (mm) | | f After| (mm) | | f Always| (mm) | | f Before| /| f After| | | f Before| /| f Always| | D01/| f Always| | BFL /| f Always| |
| 78.4 | 49.145 | -38.45 | 38.82 | 9.85 | .99 | 3.9 | 7.59 | 4.99 |
Principle of work;
Projection lens is one of central module of digital back projection television, picture signal on the chip passes through projection lens's imaging on the shadow screen, signal on the chip is not distorted, and to be delivered on the shadow screen be that we are desirable, the chip breadth is certain, chip is big more to shadow screen distance one timing shadow screen also to be that we wish, the high-quality projection lens that this just needs and necessarily picture requires coupling..The present invention satisfies: 1. lacking focal length, is 8.54 to 9.85 millimeters; 2. growing rear cut-off distance, is 44 to 49.145 millimeters so that arrange color-combination prism and associated components preferably; 3. high magnification is as/thing＞95 times; 4. high resolving power is greater than every millimeter 62 pairs of lines (distinguishable pixel is 0.0081 millimeter); 5. the edge aberration is less than 0.5 pixel; 6. image illumination uniformity＞85%; 7. distort relatively less than 0.5%; 8. field angle can reach 92.5 degree, for super wide-angle lens makes that projection screen picture diagonal angle is at 65 o'clock; 9. because changeed an angle of 90 degrees, reasonably geometric configuration makes rear-projection TV realize ultrathin type; The center is less than 80 millimeters, from the object lens rear surface to the mirror reflection surface center less than 155 millimeters.
Processing technology, assembly method and the material therefor etc. of relevant eyeglasses such as " the falcate negative film glass lens " that the present invention relates to, " falcate negative film PMMA single face non-spherical lens ", " object lens " and other parts are conventional method and known technology.
Claims (9)
1, a kind of angle turning rear-projection object lens that turn 90 degrees comprises before the object lens group, plane mirror, connecting cylinder, lens barrel behind group, the object lens, is positioned over successively in order after the shadow screen, it is characterized in that:
A. a falcate negative film glass lens (1) and a falcate PMMA plastic cement negative film single face non-spherical lens (2) constitute the preceding group of negative power of object lens, and this non-spherical lens concave surface is an aspheric surface, and the said lens centre of sphere is all towards plane mirror (10);
ъ. one group of focal power is respectively negative (3). just (4). just (5). negative (6). just (7). negative (8). just organize behind the positive light coke of the eyeglass of (9) formation object lens, the diaphragm face of this set of contact lenses is located between first pair of negative eyeglass (3) and the positive eyeglass (4), and the focus in object space of entrance pupil and system is overlapped;
C. group is an angle of 90 degrees setting behind preceding group of above-mentioned a negative power and the ъ positive light coke, and the plane mirror (10) between organizing behind group and the b positive light coke before a negative power is organized optical axis with preceding group of optical axis and back and become the miter angle setting.
2, the angle turning rear-projection object lens that turn 90 degrees as claimed in claim 1, it is characterized in that 1＞| f
Before|/| f
After|＞0.79, | f
Before| be the absolute value of group focal length before the object lens, | f
After| be the absolute value of group focal length behind the object lens.
3. the angle turning rear-projection object lens that turn 90 degrees as claimed in claim 1, it is characterized in that 4＞| f
Before|/| f
Always|＞3.8, | f
Always| be the absolute value of the total focal length of object lens.
4. the angle turning rear-projection object lens that turn 90 degrees as claimed in claim 1 is characterized in that D01/f
Always＜10, D01 is effective clear aperature of object lens first eyeglass (1) in the formula, f
AlwaysFor object lens
AlwaysFocal length.
5. the angle turning rear-projection object lens that turn 90 degrees as claimed in claim 1 is characterized in that BFL/f
Always＞4.9, BFL is the aerial rear cut-off distances of object lens in the formula.
6. the angle turning rear-projection object lens that turn 90 degrees as claimed in claim 1.It is characterized in that 1068＜TTL＜1180mm, in the formula TTL be the LCOS chip to the distance between the projection screen, LCOS is a liquid crystal on silicon.
7. the angular projection object lens that turn 90 degrees as claimed in claim 1 is characterized in that LCOS chip diagonal line is 0.7 cun, and the diagonal line of projection screen picture is 65 cun.
8, the angular projection object lens that turn 90 degrees as claimed in claim 1 is characterized in that the positive eyeglass that object lens ъ organizes, according to the order that distributes from shadow screen back respectively: second positive eyeglass (5) material employing nd=1.4874, vd=70.04; Three, the 4th positive eyeglass (7), (9) material adopt nd=1.497, vd=81.6; Extra-low Dispersion light glass is made.
9, the angular projection object lens that turn 90 degrees as claimed in claim 1 is characterized in that distance from objective front surface to the mirror reflection surface center is less than 80mm; Distance from the object lens rear surface to the mirror reflection surface center is less than 155mm.
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| CNB2005100351009A CN100432736C (en) | 2005-06-02 | 2005-06-02 | 90-degree turning rear-projection object lens |
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| CNB2005100351009A CN100432736C (en) | 2005-06-02 | 2005-06-02 | 90-degree turning rear-projection object lens |
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| CN100432736C true CN100432736C (en) | 2008-11-12 |
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| CN103105665B (en) * | 2013-03-05 | 2015-05-13 | 福建福特科光电股份有限公司 | Novel optical path deflection camera lens |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4526442A (en) * | 1981-01-28 | 1985-07-02 | U.S. Precision Lens, Inc. | Compact projection lens |
| US5026149A (en) * | 1986-11-24 | 1991-06-25 | U.S. Philips Corporation | Projection lens system |
| CN2516988Y (en) * | 2002-01-24 | 2002-10-16 | 杭州照相机械研究所 | Rear-projection lens |
| CN1431541A (en) * | 2002-01-09 | 2003-07-23 | 三星电子株式会社 | Projection lens unit of projecting television |
-
2005
- 2005-06-02 CN CNB2005100351009A patent/CN100432736C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4526442A (en) * | 1981-01-28 | 1985-07-02 | U.S. Precision Lens, Inc. | Compact projection lens |
| US5026149A (en) * | 1986-11-24 | 1991-06-25 | U.S. Philips Corporation | Projection lens system |
| CN1431541A (en) * | 2002-01-09 | 2003-07-23 | 三星电子株式会社 | Projection lens unit of projecting television |
| CN2516988Y (en) * | 2002-01-24 | 2002-10-16 | 杭州照相机械研究所 | Rear-projection lens |
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