CN107065406A - A kind of universal short focus projection optical system - Google Patents
A kind of universal short focus projection optical system Download PDFInfo
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- CN107065406A CN107065406A CN201710168890.0A CN201710168890A CN107065406A CN 107065406 A CN107065406 A CN 107065406A CN 201710168890 A CN201710168890 A CN 201710168890A CN 107065406 A CN107065406 A CN 107065406A
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- optical system
- lens group
- short focus
- projection optical
- focus projection
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- 230000003287 optical effect Effects 0.000 title claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000006185 dispersion Substances 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000000571 coke Substances 0.000 claims abstract description 7
- 239000011521 glass Substances 0.000 claims description 8
- 238000013461 design Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a kind of universal short focus projection optical system.The system includes optical lens, diaphragm and optical prism.The system set gradually for：Second lens group of the first lens group, positive light coke with negative power, the 3rd lens group of negative power, diaphragm, the 4th lens group of positive light coke, optical prism；The first lens group element containing sized non-spherical resin；4th lens group material containing low dispersion.Focal length f, the focal length f1 of first lens group of the universal short focus projection optical system, wherein, 0.15 ＜ f/f1 ＜ 0.6.The back focal length of the universal short focus projection optical system is BFL, wherein, 13 ＜ BFL ＜ 17.The maximum caliber of the universal short focus projection optical system is D, wherein, D ＜ 60mm.The present invention realizes universal design of the projection optical system on DLP and LCD projector；Meanwhile, it reduce further production cost.
Description
Technical field
The present invention relates to optical technology domain, more particularly to a kind of universal short focus optical projection system.
Background technology
Projecting apparatus is widely used in the places such as education, commercial affairs, engineering, family expenses.In engineering field, complicated and limited installation
Environment, often requires that projector matches short-focus lens, to reach bigger picture effect in short distance.Import short focus matches mirror
Cost is high mostly for head, and the cycle is long, it is impossible to which correspondence country project demands, domestic camera lens is increasingly becoming cultural venue multimedia item purpose
It is preferred.High-quality imaging is always the inferior position of domestic camera lens, and domestic alternative camera lens is often from cost consideration, it is impossible to carry out ultimate attainment
Design, sacrifices some image quality.Two types of DLP, LCD commonly used for engineering, due to the difference of its internal structure, mesh
It is preceding that independent design is all employed including import camera lens, so as to cause the optical system suitable for both projectors to have
Different characteristics, generally can not used interchangeably.Short focus optical system has very big market value, is permitted while exist again
Many technological difficulties.The short focus projection optical system sold in the market and the wildcard degree of different model projector are low, and exist
Bore is big, overall length is long, the shortcomings of uniformity is not high.For the user of the applications such as display and demonstration, due to using dynamic image more,
Consideration based on cost, reduces the requirement to quality, but still it is expected that domestic camera lens can be approached and be even up into mouth mirror
The effect of head.
The content of the invention
It is an object of the invention to provide a kind of while suitable for DLP and LCD projector universal short focus optical system,
Possess high-performance, the advantage of small size.On the premise of holding is consistent with import lens quality, existing short focus projected light is solved
System is only capable of being applicable that the matching degree that a kind of projecting apparatus brought is low, complicated, volume is big, it is costly the problem of.
The present invention uses following technical scheme：
1. it is designed using DLP projector wide spectrum；
2. it is designed using LCD longer rear cut-off distance；
3. small-bore, small size, high-performance imaging problem are solved using aspheric surface technology, low chromatic dispersion material glass；
4. the cost of batch production is reduced using resin transfer molding techniques.
The present invention has the beneficial effect that：
The present invention is on the basis of the different structure feature of DLP and LCD projector is made full use of, before ensureing that cost is controllable
Put, with larger design redundancy, realize the design of universal short focus projection optical system, from largely solving not
The problem of can not being shared with the camera lens of display type projector, by structure matching, a variety of brands of quick adjustment adaptation and model
Engineering projector, reduce cost on the premise of advantageously ensuring that quality, be conducive to full product line to pass through single Iterative Design real
The effect of existing global optimization；By optimize each surface face shape parameter, suitably calculate non-spherical element aspherical equation with
And rational selection low dispersion material, short focus projection optical system is designed, the aberration of system is corrected, image quality
Diffraction limit is reached, is conducive to high-performance and the miniaturization of optical system；Processing meets injection and the normal light of sized non-spherical resin
Cold worked technical requirements are learned, so as to reduce production cost.
Brief description of the drawings
Fig. 1 is the light path analogous diagram of universal short focus projection optical system in the embodiment of the present invention；
Fig. 2 is the transmission function figure of universal short focus projection optical system in the embodiment of the present invention；
Fig. 3 is the curvature of field and distortion figure of universal short focus projection optical system in the embodiment of the present invention；
Fig. 4 is the point range figure of universal short focus projection optical system in the embodiment of the present invention
Embodiment
It is low in order to solve existing domestic camera lens and the wildcard degree of different model projector, and have that bore is big, overall length is long,
The shortcomings of uniformity is not high, the invention provides a kind of universal short focus projection optical system.Below in conjunction with accompanying drawing and implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only to explain this hair
It is bright, do not limit the present invention.
As shown in figure 1, the present embodiments relate to a kind of universal short focus projection optical system (hereinafter referred to as optical system
System), including：The second lens group G2, the 3rd lens of negative power of the first lens group G1, positive light coke with negative power
Group G3, diaphragm S1, the 4th lens group G4, the optical prism T1 of positive light coke；The first lens group element containing sized non-spherical resin；
4th lens group material containing low dispersion.Focal power is the inverse of focal length, and positive light coke is exactly the inverse of positive focal length, i.e., positive light
Focal power is shown to be positive lens；Negative power is exactly that the inverse of negative focal length, i.e. negative power are shown to be negative lens.Optical system expires
Foot row condition：1.-0.15 ＜ f/f1 ＜ -0.6, wherein, f is the focal length of optical system；F1 is the first lens group G1 focal length.
2.13 ＜ BFL ＜ 17, wherein, BFL is the back focal length of optical system.
Wherein, the first lens group G1 includes the first lens of negative power and the second lens of negative power.G1 focal length
Meet -0.15 ＜ f/f1 ＜ -0.6, ensure optical system focal length under the premise of, make optical system structure it is more compact, process more
Simply.
Second lens group G2 includes the 3rd lens of positive light coke.Specifically, the 3rd lens are biconvex lens.3rd is saturating
Microscope group G3 includes the 4th lens of negative power, wherein, the 4th lens are a piece of cemented doublet.4th lens group G4 is included just
5th lens of focal power and the 6th lens, wherein, the 5th lens be a piece of three balsaming lens, the 6th lens be a piece of biconvex just
Lens.In the present embodiment, the first lens group G1, the second lens group G2, the 3rd lens group G3 and the 4th lens group G4 are not limited to
Using only above-mentioned form of lens, above-mentioned functions can also be realized by other lenses combination.
In the present embodiment, for balance color aberrations, the 6th lens use the glass of low chromatic dispersion material；In addition, in order to improve
System spherical aberration, astigmatism and the curvature of field, while reducing processing cost, are devised aspherical on the second lens.
The optical system of the present embodiment also includes a diaphragm S1, is placed on after the 3rd lens group G3.
The optical system of the present embodiment also includes a prism T1, is placed on after the 6th lens group G6.T1 is in projector
Standardized element, in optical design, need to as system a lens corrects aberrations.
As shown in figure 1, working in the light of wave band of the present invention, by prism, assembled by lens group G1, pass through lens group
G2, is focused on again on lens group G3, then constrains beam size by aperture diaphragm S1, is eventually passed lens group G4 convergences, is led to
Prism T1 is crossed, by convergence of rays in image planes.
By the reasonable distribution to each lens group focal power, the geometrical structure parameter of lens is properly selected, with reference to not
With the positive negative lens of material, the requirement of system focal length and aberration correction can be reached.In order to ensure that system has longer rear Jiao
Away from while reduction system volume, in suitable lens surface using aspherical, continues to optimize optical system；Meanwhile, select low color
The glass of material is dissipated, further reduction system aberration improves image quality.After being optimized to system, projection compares 0.75
The optical system of (0.7 " panel), its length is only 90mm, and maximum caliber is only 59mm, and back focal length is 15mm.Set with tradition
Meter is compared, and greatly reduces volume, alleviates system weight, improves back focal length.
Table 1 below shows a preferred embodiment of optical system.
Table 1
In table 1, radius of curvature is the radius of curvature on each surface, and unit is mm.Interval refers between two adjacent surfaces
Distance.For example, the distance of surface S1 spacing, i.e. surface S1 to surface S2.S is the surface of each lens, the small side of numerical value
Towards object space, the big side of numerical value is towards image space.Thickness, optical material in remarks column corresponding to each lens refer in colleague
Each spacing and the corresponding numerical value of optical material.Refractive Index of Material and the physical characteristic that Abbe number is lens.In addition, surface
S10 is diaphragm face.
Table 2 lists the surface S3 of the second lens asphericity coefficient.
Table 2
| Surface | k | A | B | C |
| S3 | 0 | -2.5374E-7 | 3.6331E-11 | -7.535E-14 |
The aspherical face type equation of second lens is：
Wherein, Z is aspherical rise；C is vertex curvature radius；K is conic section coefficient；A, B, C are respectively aspherical
Coefficient；Y is the radial coordinate put on non-spherical surface.
Table 3 lists some important parameters of the present embodiment optical system.
Table 3
| Projection is than (0.7 " panel) | Focal length (mm) | F (aperture) numbers | Back focal length |
| 0.75 | 150 | 2.1 | 15 |
Table 3 includes projection ratio, focal length, F (aperture) numbers and back focal length, and a kind of light of projecting apparatus is only applicable to traditional
System is compared, and the present embodiment has reached the big purpose projected than, long back focal length using aspherical and low dispersion time material, together
When, control is optimized in aspherical S3 asphericity coefficient so that aspherical surface face type can use common mould pressing technology
Manufacture, so as to reduce the requirement to processing technology, can realize batch Die Casting, advantageously reduce processing cost, improve and add
Work efficiency rate.
Fig. 2 gives the optical transfer function situation of system, big to the optical transfer function for locating system in the line of frequency 36
In 0.4, with good image quality.
Fig. 3 is the curvature of field and distortion figure of system.As can be seen that the distortion of optical system is respectively less than 0.5% in full filed,
Meanwhile, the curvature of field is respectively less than 0.1 in full filed, it is ensured that the fine quality of system imaging.
Fig. 4 is the point range figure of system.As can be seen that the imaging facula of optical system is small, the light concentration degree of each wave band
The hot spot of height, most peripheral field is less than 42 μm, and high degree reduces aberration, it is ensured that the color concentration degree of system.
As can be seen from the above-described embodiment, the present invention utilizes the physical characteristic of non-spherical element and low dispersion material,
Realize universal design of the projection optical system on DLP and LCD projector；By the face shape parameter, appropriate for optimizing each surface
Ground calculates the aspherical equation and rational selection low dispersion material of non-spherical element, design short focus projection optics system
System, enables system to be corrected in the spherical aberration and aberration of wide spectrum, and projected image all reaches diffraction limit as matter, is conducive to optics
High Qinghua of system；Rational design ensure that the miniaturization of optical system so that sized non-spherical resin meets injection batch machining
Technical requirements, glass processing meets the cold worked technical requirements of ordinary optical, so as to reduce production cost.
Although finally having been disclosed for the preferred embodiments of the present invention, the skill of this area it should be noted that being example purpose
Art personnel will recognize that various improvement, increase and substitution are also possible, and therefore, the scope of the present invention should be not limited to above-mentioned reality
Apply example.The present embodiment puts case only for illustrating the present invention without limiting the present invention described technology；It is any not depart from skill of the present invention
The improvement of art scheme, is covered by interest field of the presently claimed invention.
Claims (10)
1. a kind of universal short focus projection optical system, it is characterised in that the system includes：
Optical lens, diaphragm and optical prism, the system set gradually for：The first lens group, positive light with negative power
Second lens group of focal power, the 3rd lens group of negative power, diaphragm, the 4th lens group of positive light coke, optical prism；It is described
First lens group element containing sized non-spherical resin；4th lens group material containing low dispersion；The universal short focus projection optics
Focal length f, the focal length f1 of first lens group of system, wherein, -0.15 ＜ f/f1 ＜ -0.6；The universal short focus projection
The back focal length of optical system is BFL, wherein, 13 ＜ BFL ＜ 17；The maximum caliber of the universal short focus projection optical system is
D, wherein, D ＜ 60mm.
2. universal short focus projection optical system as claimed in claim 1, it is characterised in that first lens group is a piece of
Negative lens glass and a piece of concave-concave sized non-spherical resin of the convex surface towards object space；Second lens group is a piece of biconvex surface glass；Institute
It is one group of double glued negative lens glass to state the 3rd lens group；4th lens group is one group of three glyglass and a piece of biconvex
Glass.
3. universal short focus projection optical system as claimed in claim 2, it is characterised in that the first lens group contains a piece of aspheric
Face resin.
4. universal short focus projection optical system as claimed in claim 2, it is characterised in that the 4th lens group is employed
Low dispersion material.
5. universal short focus projection optical system as claimed in claim 1, it is characterised in that the optical system can be simultaneously
Meet the use of DLP and LCD Liang Zhong projectors.
6. universal short focus projection optical system as claimed in claim 1, it is characterised in that the optical system is in projection
During 0.7 " target surface, projection is than being 0.75.
7. universal short focus projection optical system as claimed in claim 1, it is characterised in that the distortion ＜ of the optical system
± 0.5%.
8. universal short focus projection optical system as claimed in claim 1, it is characterised in that light after the 4th lens group with
Primary optical axis is parallel.
9. the universal short focus projection optical system as described in any one of claim 1~8, it is characterised in that described universal
Short focus projection optical system also includes a diaphragm, is placed on after the 3rd lens group.
10. the universal short focus projection optical system as described in any one of claim 1~9, it is characterised in that described universal
Short focus projection optical system also includes an optical prism, is placed on after the 4th lens group, belongs to the built-in mark of projecting apparatus
Quasi- part.
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| CN201710168890.0A CN107065406A (en) | 2017-03-21 | 2017-03-21 | A kind of universal short focus projection optical system |
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| CN201710168890.0A CN107065406A (en) | 2017-03-21 | 2017-03-21 | A kind of universal short focus projection optical system |
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| CN201710168890.0A Pending CN107065406A (en) | 2017-03-21 | 2017-03-21 | A kind of universal short focus projection optical system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398846A (en) * | 2018-05-16 | 2018-08-14 | 中山联合光电科技股份有限公司 | A kind of super large projection scope projection optical system |
| CN109491053A (en) * | 2018-12-29 | 2019-03-19 | 深圳市点睛创视技术有限公司 | A kind of Miniature projection lens |
| CN110471243A (en) * | 2019-08-21 | 2019-11-19 | 宁波锦辉光学科技有限公司 | A kind of high brightness and resolution is big apart from automobile LOGO projection optical system |
| CN110579927A (en) * | 2019-10-09 | 2019-12-17 | 安徽仁和光电科技有限公司 | Small low-F-number high-definition projection lens |
| TWI683151B (en) * | 2019-03-07 | 2020-01-21 | 大陸商信泰光學（深圳）有限公司 | Lens assembly |
| CN111856848A (en) * | 2020-08-31 | 2020-10-30 | 南阳南方智能光电有限公司 | Micro-projection lens for 0.23-inch chip |
| CN111965824A (en) * | 2020-08-26 | 2020-11-20 | 北京耐德佳显示技术有限公司 | Optical lens group and near-to-eye display system using same |
| CN112147753A (en) * | 2019-06-28 | 2020-12-29 | 上旸光学股份有限公司 | Projection system |
| WO2021031499A1 (en) * | 2019-08-22 | 2021-02-25 | 广景视睿科技（深圳）有限公司 | Projection lens |
| CN113126253A (en) * | 2021-03-04 | 2021-07-16 | 重庆融豪太视科技有限公司 | High-resolution direct-injection type short-focus projection lens |
| CN113419329A (en) * | 2021-05-31 | 2021-09-21 | 歌尔光学科技有限公司 | Optical system and projection equipment |
| CN118244454A (en) * | 2024-05-23 | 2024-06-25 | 沂普光电(天津)有限公司 | Small-volume long-focus projection system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398846A (en) * | 2018-05-16 | 2018-08-14 | 中山联合光电科技股份有限公司 | A kind of super large projection scope projection optical system |
| CN108398846B (en) * | 2018-05-16 | 2024-04-09 | 中山联合光电科技股份有限公司 | Ultra-large projection range projection optical system |
| CN109491053A (en) * | 2018-12-29 | 2019-03-19 | 深圳市点睛创视技术有限公司 | A kind of Miniature projection lens |
| CN109491053B (en) * | 2018-12-29 | 2024-04-26 | 深圳市点睛创视技术有限公司 | Miniature projection lens |
| TWI683151B (en) * | 2019-03-07 | 2020-01-21 | 大陸商信泰光學（深圳）有限公司 | Lens assembly |
| CN112147753B (en) * | 2019-06-28 | 2022-07-19 | 上旸光学股份有限公司 | Projection system |
| CN112147753A (en) * | 2019-06-28 | 2020-12-29 | 上旸光学股份有限公司 | Projection system |
| CN110471243A (en) * | 2019-08-21 | 2019-11-19 | 宁波锦辉光学科技有限公司 | A kind of high brightness and resolution is big apart from automobile LOGO projection optical system |
| WO2021031499A1 (en) * | 2019-08-22 | 2021-02-25 | 广景视睿科技（深圳）有限公司 | Projection lens |
| CN110579927A (en) * | 2019-10-09 | 2019-12-17 | 安徽仁和光电科技有限公司 | Small low-F-number high-definition projection lens |
| CN111965824A (en) * | 2020-08-26 | 2020-11-20 | 北京耐德佳显示技术有限公司 | Optical lens group and near-to-eye display system using same |
| CN111856848A (en) * | 2020-08-31 | 2020-10-30 | 南阳南方智能光电有限公司 | Micro-projection lens for 0.23-inch chip |
| CN113126253A (en) * | 2021-03-04 | 2021-07-16 | 重庆融豪太视科技有限公司 | High-resolution direct-injection type short-focus projection lens |
| CN113126253B (en) * | 2021-03-04 | 2022-06-21 | 重庆融豪太视科技有限公司 | High-resolution direct-injection type short-focus projection lens |
| CN113419329A (en) * | 2021-05-31 | 2021-09-21 | 歌尔光学科技有限公司 | Optical system and projection equipment |
| CN118244454A (en) * | 2024-05-23 | 2024-06-25 | 沂普光电(天津)有限公司 | Small-volume long-focus projection system |
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