CN202929276U - Miniature projection lens - Google Patents
Miniature projection lens Download PDFInfo
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- CN202929276U CN202929276U CN 201220614153 CN201220614153U CN202929276U CN 202929276 U CN202929276 U CN 202929276U CN 201220614153 CN201220614153 CN 201220614153 CN 201220614153 U CN201220614153 U CN 201220614153U CN 202929276 U CN202929276 U CN 202929276U
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Abstract
The utility model relates to a miniature projection lens, which comprises a first negative-power lens assembly, a second positive-power lens assembly, a diaphragm arranged between the first lens assembly and the second lens assembly, and a display chip. The first lens assembly is arranged in front of the diaphragm and comprises a first lens, a second lens and a third lens. The first lens has a positive focal power and is arranged close to a projection screen. The second lens and the third lens are arranged close to the diaphragm, wherein both the second lens and the third lens are a negative-power doublet lens respectively. The second lens assembly is positioned behind the diaphragm and comprises a fourth lens, a fifth lens, a positive-power sixth lens and a positive-power seventh lens, wherein both the fourth lens and the fifth lens are a positive-power doublet lens respectively. The miniature projection lens has the advantages of small size, compact structure, small distortion, telecentric beam path in image space, large viewing angle and so on.
Description
Technical field
The utility model relates to a kind of projection display technique, relates in particular to a kind ofly to have that long projection ratio, the image planes heart far away, size are little, the Miniature projection lens of compact conformation.
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.
Micro projection system to volume miniaturization have higher requirement, correspondingly the projection lens size also requires littlely and compact, can realize the optical projection system Module-embedding to the inside, various application terminals.The existing projection lens that is applied to small projection system, the volume major part is all not little, is difficult to realize Embedded application.Present most of Miniature projection lens is all used aspherical lens in addition, because the industrial detection technical difficulty of aspheric surface face type detection technique is large, efficient is low, has increased testing cost.
Chinese invention patent application has disclosed a kind of Miniature projection lens No. 200810241681.5, comprise front group of lens, rear group of lens and be arranged at front group of lens and rear group of lens between diaphragm.Front group of lens comprise tactic first lens, the second lens and the 3rd lens.Wherein, gummed mirror before the second lens and the 3rd lens form.Rear group of lens comprise tactic the 4th lens and the 5th lens.Wherein, the convex surface of the 4th lens bends towards diaphragm.Diaphragm is positioned at the focus place, the place ahead of rear group of lens.The curved surface summit of diaphragm and the interval between diaphragm are closed on less than the 4th lens in rear group of lens in curved surface summit and the interval between diaphragm that in front group of lens, the 3rd lens close on diaphragm.
Although the Miniature projection lens that this invention discloses is simple in structure, size is less, the field angle of this projection lens only has 15 degree, can't satisfy the demand of large field angle.
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, compact conformation, have long projection less than, distortion, as the Miniature projection lens of the advantages such as side's heart far away and large field angle.
The utility model Miniature projection lens comprises the first lens group with negative power, the second lens combination with positive light coke, diaphragm and display chip between first lens group and the second lens combination, described first lens group is positioned at the diaphragm front, comprise first lens, the second lens and the 3rd lens, first lens has positive light coke, near a projection screen, described second, third lens are cemented doublet, have negative power, near diaphragm; Described the second lens combination is positioned at the diaphragm back, and what comprise two gummeds has positive light coke the 4th and the 5th lens, has positive light coke the 6th lens and have the 7th lens of positive light coke.
Compared to prior art, Miniature projection lens size of the present utility model is little, compact conformation, and all eyeglasses all adopt spheric glass, and cost is low, have simultaneously distortion little, as series of advantages such as Fang Yuanxin, large field angle.
Description of drawings
Fig. 1 is the optical structure chart of Miniature projection lens of the present utility model.
Fig. 2 is that 0 degree, 5.6 degree, 11.2 degree, 16.8 degree, 19.6 degree, 28 each field angle of degree of Miniature projection lens of the present utility model is at the light point range figure of chip face.
Fig. 3 is each visual field chip face transport function mtf value of Miniature projection lens of the present utility model, and apart from 680mm, 20 cun of projection screens are estimate of situation to this transfer function values with projection, 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. 4 is the curvature of field and the distortion figure of Miniature projection lens of the present utility model.
Fig. 5 is the chromatic longitudiinal aberration figure of Miniature projection lens of the present utility model.
Fig. 6 is the axial chromatic aberration figure of Miniature projection lens of the present utility model.
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 Miniature projection lens.As shown in Figure 1, Miniature projection lens of the present utility model comprises first lens group 110, the second lens combination 120 with positive light coke with negative power, is arranged at diaphragm 150 and a display chip 140 between first lens group 110 and the second lens combination 120.
The utility model Miniature projection lens one has 12 optical surfaces, 9 air surface (1,2,3,5,6,8,9,10,11,12) wherein, 2 cemented surfaces (4,7).First lens 111 is plano-convex lens, and convex surface is positive meniscus lens towards projection screen 130, the second lens 112, the 3rd lens 113 be diverging meniscus lens and with the second lens 112 gummed, concave surface is all towards diaphragm 150.The combined focal length of first lens group 110 is for negative, and the combined focal length of the second lens combination 120 is being for just, and front group for negative, and rear group is to move after positive structure makes the interarea of this Miniature projection lens, and the back pitch increase is to reserve enough spaces to projection lighting engine optical element.Wherein, the first lens 111 of first lens group 110 is just being organized front, and negative group of the second lens 112 and the 3rd lens 113 gummed rear, and this structure can be effectively correcting distorted.Diaphragm 150 is positioned on the focal plane of the second lens combination 120, makes like this emergent pupil be imaged onto the infinite distance, thereby has realized picture Fang Yuanxin.
The projection of the utility model Miniature projection lens is than being T, and total focal length is f, and total length (not containing image distance) is L, and the combined focal length of first lens group 110 is f (11), and the combined focal length of the second lens combination 120 is f (12).First lens 111 focal lengths are f1, the balsaming lens combined focal length that the second lens 112 and the 3rd lens 113 form is f23, the combined focal length of the balsaming lens that the 4th lens 121 and the 5th lens 122 form is f45, the focal length of the 6th lens 123 is f6, the 7th lens 124 focal lengths are f7, and the focal length of described lens and curvature have following relation:
0.25<r5/r4<0.35 r3>0；r4>0；r5>0；(1)
0.4<|f23/f1|<0.55 (2)
f45≈f6≈f7 (3)
Wherein, r3 is the 3rd curvature of face, by that analogy.Here define r3〉0, r4〉0, r5〉0, three face be simultaneously towards diaphragm 150, and form symmetrical structure, effectively aberration and comas on axis calibration with the second lens combination 120 about diaphragm 150.The 6th lens 123 are the bent moon positive lens, and concave surface is towards the direction of diaphragm 150.The 7th lens 124 are positive lens, are shaped as plano-convex or biconvex, if plano-convex lens, convex surface is towards the direction of display chip 140.
Miniature projection lens described in the utility model, the arrangement of materials of each lens is as follows:
The 4th lens 121, the 5th lens 122 and the 6th lens 123 are the achromatic key points of whole camera lens.Its glass material arrangement is divided into following three kinds of situations:
The 4th lens 121 are flint glass, and the 5th lens 122 are flint glass, and the 6th lens 123 are crown glass;
The 4th lens 121 are crown glass, and the 5th lens 122 are crown glass, and the 6th lens 123 are flint glass;
The 4th lens 121, the 5th lens 122, the 6th lens 123 all use the crown glass of low dispersion.
In a specific embodiment, the material of each lens of Miniature projection lens described in the utility model can arrange as follows:
The second lens 112 materials'use flint glasses;
The crown glass of the 3rd lens 113 materials'use high Abbe numbers;
The flint glass of the low Abbe number of the 4th lens 121 materials'use highs index of refraction;
The 5th lens 122 materials'use crown glasses;
The 6th lens 123 materials'use crown glasses;
The 7th lens 124 materials'use crown glasses.
Below provide embodiment data of Miniature projection lens described in the utility model:
Wavelength: 445nm-532nm-640nm
Projection ratio: 1.5
Full field angle: 56 °
Effective focal length: 7.513mm
Image height: 7.9mm
Picture side F/#:3.2
Structured data:
| The face order | Radius-of-curvature | Thickness | Refractive index | Abbe number | Bore |
| 1 | 14.612 | 1.94 | 1.64 | 60.2 | 9.90 |
| 2 | 997.741 | 0.152 | 8.90 | ||
| 3 | 5.466 | 1.27 | 1.81 | 25.5 | 6.60 |
| 4 | 6.468 | 0.92 | 1.49 | 70.4 | 5.30 |
| 5 | 2.03 | 1.512 | 3.20 | ||
| Stop | Infinity | 0.282 | 1.85 | ||
| 7 | -9.788 | 2.74 | 1.85 | 25.5 | 2.20 |
| 8 | 28.278 | 2.10 | 1.50 | 81.6 | 4.80 |
| 9 | -4.004 | 1.364 | 5.80 | ||
| 10 | -33.395 | 1.80 | 1.61 | 58.6 | 8.00 |
| 11 | -8.761 | 0.20 | 8.60 | ||
| 12 | 26.832 | 1.9 | 1.62 | 58.1 | 9.26 |
| 13 | -18.379 | 1.00 | 9.40 | ||
| 14 | Infinity | 7.40 | 1.65 | 33.8 | 9.20 |
| 15 | Infinity | 1.00 | 9.20 | ||
| 16 | Infinity | 0.70 | 1.52 | 64.2 | 8.10 |
| SI | Infinity | 3.97 |
Fig. 2 is that 0 degree, 5.6 degree, 11.2 degree, 16.8 degree, 19.6 degree, 28 each field angle of degree of Miniature projection lens of the present utility model is at the light point range figure of chip face.The root mean square radius of point range figure should be less than display chip pixel size 7.5um.
Fig. 3 is each visual field chip face transport function mtf value of Miniature projection lens of the present utility model, and apart from 680mm, 20 cun of projection screens are estimate of situation to this transfer function values with projection, the sampling take projection angle as the visual field.Horizontal ordinate is the spatial frequency coordinate, and ordinate is the transport function mtf value.As can be seen from the figure, Miniature projection lens 10 of the present utility model is at 92.6 lines during to spatial frequency, visual field point mtf value 0.75 on axle, visual field, edge mtf value 0.35.
Fig. 4 is the curvature of field and the distortion figure of Miniature projection lens of the present utility model, and as can be seen from the figure maximum distortion is 1.6%.
Fig. 5 and Fig. 6 are respectively chromatic longitudiinal aberration figure and the axial chromatic aberration figure of Miniature projection lens of the present utility model.Wherein in Fig. 5, transverse axis represents the aberration size, and the longitudinal axis represents the visual field.In Fig. 6, transverse axis represents the position along axial focus, and the longitudinal axis represents wavelength.
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 (9)
1. Miniature projection lens, comprise the first lens group with negative power, the second lens combination with positive light coke, diaphragm and display chip between first lens group and the second lens combination, it is characterized in that: described first lens group is positioned at the diaphragm front, comprise first lens, the second lens and the 3rd lens, first lens has positive light coke, and near a projection screen, described second, third lens are cemented doublet, has negative power, near diaphragm; Described the second lens combination is positioned at the diaphragm back, and what comprise two gummeds has positive light coke the 4th and the 5th lens, has positive light coke the 6th lens and have the 7th lens of positive light coke.
2. Miniature projection lens as claimed in claim 1, it is characterized in that: the projection ratio of above-mentioned projection lens is 1.5.
3. Miniature projection lens as claimed in claim 1, it is characterized in that: described Miniature projection lens one has 12 optical surfaces, wherein r3, r4, r5 be respectively third and fourth, the curvature of five optical surfaces, they satisfy following relation: 0.25＜r5/r4＜0.35 and r3〉0, r4 0, r5 0.
4. Miniature projection lens as claimed in claim 1, it is characterized in that: the focal length of described first lens is f1, the second lens and the 3rd lens glue combined focal length altogether are f23, are tied to form vertical just like ShiShimonoseki: 0.4＜| f23/f1|＜0.55.
5. Miniature projection lens as claimed in claim 1 is characterized in that: the combined focal length of described first lens group is for negative, and first lens is plano-convex lens, and convex surface is towards projection screen; The second lens are the bent moon positive lens, and the 3rd lens are the bent moon negative lens, described the second lens and the 3rd lens gummed, and concave surface is all towards diaphragm.
6. Miniature projection lens as claimed in claim 1, it is characterized in that: in described first lens group, first lens high Abbe number crown glass, the cemented doublet that the second lens and the 3rd lens form is combined by the crown glass of the low Abbe number flint glass of a high index of refraction and a low-refraction high Abbe number.
7. Miniature projection lens as claimed in claim 1 is characterized in that: the combined focal length of described the second lens combination is being for just, and the 4th lens and the 5th lens gummed are positioned at the diaphragm back; The 6th lens are the bent moon positive lens, and concave surface is towards the diaphragm direction, and the 7th lens are positive lens, are shaped as plano-convex or biconvex, if plano-convex lens, convex surface is towards the display chip direction.
8. Miniature projection lens as claimed in claim 7, it is characterized in that: in described the second lens combination, the focal length of the cemented doublet that the 4th lens and the 5th lens form is f45, the focal distance f 6 of the 6th lens, the focal length of the 7th lens is f7, focal length value between them is substantially suitable, and difference is less than 20%:| (f45-f6)/f6|＜20%; | (f45-f7)/f7|＜20%; | (f7-f6)/f6|＜20%.
9. Miniature projection lens as claimed in claim 8, it is characterized in that: in described the second lens combination, the cemented doublet that the 4th lens and the 5th lens form is combined by the crown glass of the low Abbe number flint glass of a high index of refraction and a low-refraction high Abbe number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220614153 CN202929276U (en) | 2012-11-19 | 2012-11-19 | Miniature projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220614153 CN202929276U (en) | 2012-11-19 | 2012-11-19 | Miniature projection lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202929276U true CN202929276U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220614153 Expired - Fee Related CN202929276U (en) | 2012-11-19 | 2012-11-19 | Miniature projection lens |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259637A (en) * | 2015-11-04 | 2016-01-20 | 福建福光股份有限公司 | Large-target face day and night confocal high-definition fixed-focus lens |
| CN107167992A (en) * | 2017-06-02 | 2017-09-15 | 合肥科视激光科技有限公司 | A kind of telecentricity digital projector camera lens of the small projection ratio of wide-angle |
| CN110568586A (en) * | 2019-08-30 | 2019-12-13 | 歌尔股份有限公司 | Projection lens and projection equipment |
| CN110764221A (en) * | 2018-07-25 | 2020-02-07 | 上旸光学股份有限公司 | Projection lens system |
| CN114924380A (en) * | 2022-04-29 | 2022-08-19 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
| CN115808772A (en) * | 2022-09-21 | 2023-03-17 | 西安应用光学研究所 | Vehicle-mounted lens optical system suitable for 8MP chip |
-
2012
- 2012-11-19 CN CN 201220614153 patent/CN202929276U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259637A (en) * | 2015-11-04 | 2016-01-20 | 福建福光股份有限公司 | Large-target face day and night confocal high-definition fixed-focus lens |
| CN107167992A (en) * | 2017-06-02 | 2017-09-15 | 合肥科视激光科技有限公司 | A kind of telecentricity digital projector camera lens of the small projection ratio of wide-angle |
| CN107167992B (en) * | 2017-06-02 | 2019-11-05 | 合肥翰视激光科技有限公司 | A kind of telecentricity digital projector camera lens of the small projection ratio of wide-angle |
| CN110764221A (en) * | 2018-07-25 | 2020-02-07 | 上旸光学股份有限公司 | Projection lens system |
| CN110764221B (en) * | 2018-07-25 | 2021-09-17 | 上旸光学股份有限公司 | Projection lens system |
| CN110568586A (en) * | 2019-08-30 | 2019-12-13 | 歌尔股份有限公司 | Projection lens and projection equipment |
| CN110568586B (en) * | 2019-08-30 | 2024-06-04 | 歌尔光学科技有限公司 | Projection lens and projection equipment |
| CN114924380A (en) * | 2022-04-29 | 2022-08-19 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
| CN115808772A (en) * | 2022-09-21 | 2023-03-17 | 西安应用光学研究所 | Vehicle-mounted lens optical system suitable for 8MP chip |
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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: 20141119 |
|
| EXPY | Termination of patent right or utility model |