CN208110242U - A kind of super large projection scope projection optical system - Google Patents
A kind of super large projection scope projection optical system Download PDFInfo
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- CN208110242U CN208110242U CN201820734494.XU CN201820734494U CN208110242U CN 208110242 U CN208110242 U CN 208110242U CN 201820734494 U CN201820734494 U CN 201820734494U CN 208110242 U CN208110242 U CN 208110242U
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Abstract
The utility model discloses a kind of super large projection scope projection optical systems, including dmd chip and reflecting mirror, opposite the first static lens group of dmd chip is provided between the dmd chip and reflecting mirror, the focal power of first lens group is negative, the second lens group that can be moved between the first lens group of dmd chip is provided between the dmd chip and the first lens group, the focal power of second lens group is positive, the third lens group that can be moved between dmd chip and the second lens group is provided between the dmd chip and the second lens group, the focal power of the third lens group is negative, opposite the 4th static lens group of dmd chip is provided between the dmd chip and the third lens group, the focal power of 4th lens group is positive.The utility model has many advantages, such as that high-resolution, fine definition, projection scope are big, projects ratio less than 0.2, can be mass.
Description
Technical field
The utility model relates to a kind of optical system, especially a kind of super large projection scope projection optical system.
Background technique
Recently as the development of shadow casting technique, projector has been widely used in the fields such as household, education, office.
Compared to expensive LCD TV, the projector with super large screen effect and close price is more and more popular with consumers.Its
Direction of the middle high definition as the unremitting advance of projector, ultrashort coke are the inexorable trends of projector's future development.Ultrashort coke technology
Using making projector under shorter projection distance, obtain same even bigger projection image, can preferably utilize
Under the space environment of compact.Existing market mainstream technology be using reflection type projection, make the projection of projector compare 0.4 with
Under, to realize the drop shadow effect of ultrashort coke.
The generally existing such disadvantage of ultra short focal projector currently on the market：1, supported projection image is mostly 80-
120 inches, only for only a few up to 150 inches, projection scope is smaller, can not support projection image more significantly；Although 2, can support
80-150 inches of projection scope, but be only can focusing range, not can guarantee 80-150 inches of global performance actually；3, big
Most projectors use plastic cement aspherical to reduce cost, due to the high temperature exothermic that projector uses for a long time, lead to height
It is warm empty burnt；There is not while solving the projector of class defect also currently on the market.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of super large projection scope projection optical system,
The utility model be solve its technical problem and the technical solution adopted is that：
A kind of super large projection scope projection optical system, including dmd chip and reflecting mirror, the dmd chip and reflecting mirror
Between be provided with opposite the first static lens group of dmd chip, the focal power of the first lens group is negative, the dmd chip and the
The second lens group that can be moved between the first lens group of dmd chip, the light of the second lens group are provided between one lens group
Focal power is positive, and being provided between the dmd chip and the second lens group can move between dmd chip and the second lens group
The focal power of the third lens group, the third lens group is negative, and opposite DMD core is provided between the dmd chip and the third lens group
The 4th static lens group of piece, the focal power of the 4th lens group are positive.
Preferably, the focal power of first lens group is -0.01~0.00；The light of second lens group
Focal power is 0.01~0.02；The focal power of the third lens group is -0.02~-0.01；The light of 4th lens group
Focal power is 0.05~0.06.
Preferably, the focal power of second lens group is denoted asThe focal power of the third lens group
It is denoted asWithMathematical relationship be：
Preferably, first lens group include along the first lens set gradually towards the direction of dmd chip,
Second lens and the third lens, the first power of lens are positive, and the second power of lens is negative, the focal power of the third lens
It is positive；Second lens group includes the 4th lens that focal power is positive；The third lens group includes that focal power is negative
The 5th lens；4th lens group include along the 6th lens set gradually towards the direction of dmd chip, the 7th thoroughly
Mirror, diaphragm, the 8th lens, the 9th lens, the tenth lens, the 11st lens, the 12nd lens and the 13rd lens, the 6th lens
Focal power be negative, the 7th power of lens is positive, and the 8th power of lens is negative, and the 9th power of lens is positive,
Tenth power of lens is negative, and the 11st power of lens is positive, and the 12nd power of lens is positive, the 13rd lens
Focal power be positive.
Preferably, first lens are plastic cement aspherical lens；Second lens, the third lens,
Four lens, the 5th lens, the 7th lens, the 9th lens, the tenth lens, the 11st lens and the 12nd lens are glass spherical mirror
Piece, the 11st lens and the 12nd lens are bonded by optical glue；6th lens, the 8th lens and the tenth
Three lens are Glass aspheric eyeglass.
Preferably, first lens, the 6th lens, the 8th lens and the 13rd lens are aspherical lens,
First lens, the 6th lens, the 8th lens and the 13rd lens aspherical surface shape meet following equation：
In above-mentioned formula, parameter c is curvature corresponding to radius, and y is its unit of radial coordinate and length of lens unit phase
Together, k is circular cone whose conic coefficient；When k-factor is less than -1, the face shape curve of lens is hyperbola, when k-factor is equal to -1
When, the face shape curve of lens is parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, works as k-factor
When equal to 0, the face shape curve of lens is circle, and when k-factor is greater than 0, the face shape curve of lens is oblateness；a1To a8Respectively
Indicate coefficient corresponding to each radial coordinate.
Preferably, the dmd chip is placed relative to optical axis bias, the center line of dmd chip and optical axis it is inclined
Separation is from for 5.65mm.
Preferably, the reflecting mirror is non-spherical reflector, and focal power is negative.
The utility model has the beneficial effects that：
1, the utility model projects ratio less than 0.2, and 0.38-1.5 meters of effective projection distance range, supporting 80-300 inches has
Effect projection picture, has the characteristics that super large projection scope.
2, the utility model makes two linkage groups, i.e. the second lens group focal power by each lens powers of reasonable distributionWith the third lens group focal powerRatio meet following relationship：Rationally simultaneously
It arranges in pairs or groups aspherical use, correct distortion and aberration can well；Ensure optical projection system in different object distances, projection is not
In the case where size picture, aberration variation is balanced.Make optical projection system that can effectively support 80-300 inches of projection scope, reaches
The effect of super large projection scope, while guaranteeing high-resolution within the scope of universe, effect high-definition.
3, the utility model is by rationally aspherical using plastic cement, while being used in mixed way glass lens and plastic lens, makes
Under high temperature environment, type swell increment aberration with caused by eyeglass face changes optical projection system, cancels out each other.Reducing the same of cost
When, realize not empty coke under the condition of high temperature.
Detailed description of the invention
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Fig. 1 is Tthe utility model system optical picture；
Fig. 2 is the optical picture of the second lens group；
Fig. 3 is Tthe utility model system index path；
Fig. 4 is the partial enlargement diagram of part A in Fig. 3.
Specific embodiment
The utility model is further described with reference to the accompanying drawing：
Referring to figs. 1 to Fig. 3, the embodiments of the present invention propose a kind of super large projection scope projection optical system, packet
Dmd chip 100 and reflecting mirror 300 are included, it is static that opposite dmd chip 100 is provided between the dmd chip 100 and reflecting mirror 300
The first lens group 210, the focal power of the first lens group 210 is negative, sets between the dmd chip 100 and the first lens group 210
It is equipped with the second lens group 220 that can be moved between 100 first lens group 210 of dmd chip along the center line of dmd chip,
The focal power of second lens group 220 is positive, and being provided between the dmd chip 100 and the second lens group 220 can be in DMD core
The third lens group 230 moved between piece 100 and the second lens group 220 along the center line of dmd chip, the third lens group 230
Focal power be negative, be provided between the dmd chip 100 and the third lens group 230 opposite dmd chip 100 it is static the 4th
The focal power of lens group 240, the 4th lens group 240 is positive.
In the present embodiment, the dmd chip (100) is placed relative to optical axis bias, so that the center of dmd chip 100
The deviation distance of line and optical axis is 5.65mm.The focal power of first lens group 210 is -0.01~0.00；Described
The focal power of two lens groups 220 is 0.01~0.02；The focal power of the third lens group 230 is -0.02~-0.01；Institute
The focal power for the 4th lens group 240 stated is 0.05~0.06.Second lens group 220 and the third lens group 230 are linkage groups, institute
The focal power for the second lens group 220 stated is denoted asThe focal power of the third lens group 230 is denoted asPass through
Optical design software optimizes the every design parameter of combination to optical projection system, and each power of lens of reasonable distribution makes two
Linkage groups, the i.e. ratio of the second lens group focal power and the third lens group focal power meet following relationship：Make optical projection system in the characteristic with super large projection scope, can effectively support 80-300 inches
Projection scope, while it is reasonably distributed deflection angle of the light on each lens, using less aspherical, have
Under optimal imaging effect, guarantee possesses good craftsmanship, meets the requirement of product mass production.
Referring to Fig.1, first lens group 210 includes saturating along first set gradually towards the direction of dmd chip 100
Mirror 1, the second lens 2 and the third lens 3, the focal power of the first lens 1 are positive, and the focal power of the second lens 2 is negative, the third lens
3 focal power is positive；Second lens group 220 includes the 4th lens 4 that focal power is positive；The third lens group
230 include the 5th lens 5 that focal power is negative；4th lens group 240 include along towards the direction of dmd chip 100 according to
The 6th lens 6, the 7th lens 7, the diaphragm 14, the 8th lens 8, the 9th lens 9, the tenth lens 10, the 11st lens of secondary setting
11, the focal power of the 12nd lens 12 and the 13rd lens 13, the 6th lens 6 is negative, and the focal power of the 7th lens 7 is positive, the
The focal power of eight lens 8 is negative, and the focal power of the 9th lens 9 is positive, and the focal power of the tenth lens 10 is negative, the 11st lens 11
Focal power be positive, the focal power of the 12nd lens 12 is positive, and the focal power of the 13rd lens 13 is positive.
In the present embodiment, reflecting mirror 300 is the aspherical plastic lens of crescent, and focal power is negative, and is realizing light
When wide-angle deflection, distortion and the astigmatism of high angle scattered light can be corrected simultaneously, make the light organized after entering that there is lesser angle
And residual aberration, meanwhile, aspherical plastic lens are more at low cost than other non-spherical lenses, and such design can significantly decrease
The cost of system.First lens 1 are plastic cement aspherical lens；Second lens 2, the third lens 3, the 4th lens
4, the 5th lens 5, the 7th lens 7, the 9th lens 9, the tenth lens 10, the 11st lens 11 and the 12nd lens 12 are glass marble
Face eyeglass, the 11st lens 11 and the 12nd lens 12 are bonded by optical glue；6th lens the 6, the 8th
Lens 8 and the 13rd lens 13 are Glass aspheric eyeglass.
Be to be designed as glass aspheric lenses by the 11st lens 11, can the aberrations such as spherical aberration, coma to high light line into
Row correction, cooperates the use of the first lens 1, to realize imaging effect under large aperture and more excellent.11st lens 11 it is curved
Qu Fangxiang deviates from chip, with the first lens 1 on the contrary, guaranteeing to cause camera lens internal temperature to increase because projector uses for a long time
In the case where, the first lens 1 plastic cement aspheric superficial expansivity P1, eyeglass temperature T1, the 11st lens glass aspheric surface expansion system
Number P11, eyeglass temperature T11 meet the relational expression of P1*T1+P11*T11 ≈ 0.Pass through the aspherical knot with Glass aspheric of plastic cement
It closes and uses, solve the empty burnt phenomenon of system, it is ensured that under the condition of high temperature, optical system not defocus.
Referring to Fig.1, first lens 1, the 6th lens 6, the 8th lens 8 and the 13rd lens 13 are aspherical mirror
Piece, first lens 1, the 6th lens 6, the 8th lens 8 and the 13rd lens 13 aspherical surface shape meet with lower section
Journey：
In above-mentioned formula, parameter c is curvature corresponding to radius, and y is its unit of radial coordinate and length of lens unit phase
Together, k is circular cone whose conic coefficient；When k-factor is less than -1, the face shape curve of lens is hyperbola, when k-factor is equal to -1
When, the face shape curve of lens is parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, works as k-factor
When equal to 0, the face shape curve of lens is circle, and when k-factor is greater than 0, the face shape curve of lens is oblateness；a1To a8Respectively
Indicate coefficient corresponding to each radial coordinate.
Following embodiment is：Using distance 0.3m~1.5m, ratio 0.2 is projected, can support 80 inches~300 English of projection image
The actual design parameter of very little projection lens：
The asphericity coefficient in each aspherical face：
300 first face S1 coefficient of reflecting mirror is：
K=-768
a1=0
a2=0.00011485935
a3=-5.3053334e-007
a4=2.126744e-009
a5=-5.4787393e-012
a6=8.0470803e-015
a7=-4.9662071e-018
a8=0；
First lens, 1 first face S2 coefficient is：
K=22.275
a1=0
a2=0.00014239041
a3=-4.6197932e-007
a4=5.2022001e-010
a5=1.2998783e-011
a6=-7.5810064e-014
a7=1.4883303e-016
a8=0；
First lens, 1 second face S3 coefficient is：
K=-565.9319
a1=0
a2=-4.6842153e-006
a3=1.3583932e-008
a4=2.96366079486753e-012
a5=2.35668648024052e-015
a6=-1.7709563837241e-019
a7=-6.05918030192083e-022
a8=0；
6th lens, 6 first face S12 coefficient is：
K=-0.4040741
a1=0
a2=4.90490480030574e-007
a3=-2.05760498407608e-010
a4=2.99679825125034e-014
a5=5.55711304020551e-018
a6=-2.86845642405709e-021
a7=2.91053534222281e-025
a8=0；
6th lens, 6 second face S13 coefficient is：
K=90.3686
a1=0
a2=3.37355419190151e-008
a3=-1.68426620586378e-010
a4=-1.77578855135222e-011
a5=1.31858269908392e-013
a6=1.61679421023673e-016
a7=-3.13849187032395e-018
a8=0；
8th lens, 8 first face S17 coefficient is：
K=-1.3840751
a1=0
a2=-2.79361010729748e-008
a3=-6.6497057344366e-010
a4=-2.54430577284334e-013
a5=-1.84664483140541e-015
a6=6.46082131490784e-017
a7=-1.54392143969012e-019
a8=0；
8th lens, 8 second face S18 coefficient is：
K=-25.2567
a1=0
a2=4.90490480030574e-007
a3=-3.94843412007971e-010
a4=3.02112629843759e-013
a5=1.40840432176276e-015
a6=6.90569325719901e-019
a7=-6.52550386131808e-021
a8=0；
13rd lens, 13 first face S26 coefficient is：
K=-12.457
a1=0
a2=4.904900574e-007
a3=-2.05760908e-010
a4=2.99679824e-014
a5=-7.4255518e-16
a6=1.3859057e-18
a7=1.8118184e-23
a8=0；
13rd lens, 13 second face S27 coefficient is：
K=-1.4040741
a1=0
a2=-5.2362612e-06
a3=-2.057608e-010
a4=2.9244063e-09
a5=5.5046807e-16
a6=5.5046807e-16
a7=4.8296771e-18
a8=0.
Claims (8)
1. a kind of super large projection scope projection optical system, it is characterised in that it includes dmd chip (100) and reflecting mirror (300),
Opposite dmd chip (100) static first lens group (210) is provided between the dmd chip (100) and reflecting mirror (300),
The focal power of first lens group (210) is negative, and being provided between the dmd chip (100) and the first lens group (210) can be
The second lens group (220) moved between (100) first lens group (210) of dmd chip, the focal power of the second lens group (220)
It is positive, being provided between the dmd chip (100) and the second lens group (220) can be in dmd chip (100) and the second lens
The third lens group (230) moved between group (220), the focal power of the third lens group (230) are negative, the dmd chip (100)
Opposite the 4th static lens group (240) of dmd chip (100), the 4th lens group are provided between the third lens group (230)
(240) focal power is positive.
2. a kind of super large projection scope projection optical system according to claim 1, which is characterized in that described first is thoroughly
The focal power of microscope group (210) is -0.01~0.00；The focal power of second lens group (220) is 0.01~0.02；It is described
The third lens group (230) focal power be -0.02~-0.01；The focal power of 4th lens group (240) be 0.05~
0.06。
3. a kind of super large projection scope projection optical system according to claim 1, which is characterized in that described second is thoroughly
The focal power of microscope group (220) is denoted asThe focal power of the third lens group (230) is denoted asWithMathematical relationship be：
4. a kind of super large projection scope projection optical system according to claim 1, which is characterized in that described first is thoroughly
Microscope group (210) includes along the first lens (1), the second lens (2) and the third set gradually towards the direction of dmd chip (100)
The focal power of lens (3), the first lens (1) is positive, and the focal power of the second lens (2) is negative, and the focal power of the third lens (3) is
Just；Second lens group (220) includes the 4th lens (4) that focal power is positive；The third lens group (230) includes
The 5th lens (5) that focal power is negative；4th lens group (240) include along towards the direction of dmd chip (100) successively
The 6th lens (6) that are arranged, the 7th lens (7), diaphragm (14), the 8th lens (8), the 9th lens (9), the tenth lens (10),
The focal power of 11st lens (11), the 12nd lens (12) and the 13rd lens (13), the 6th lens (6) is negative, and the 7th thoroughly
The focal power of mirror (7) is positive, and the focal power of the 8th lens (8) is negative, and the focal power of the 9th lens (9) is positive, the tenth lens
(10) focal power is negative, and the focal power of the 11st lens (11) is positive, and the focal power of the 12nd lens (12) is positive, and the 13rd
The focal power of lens (13) is positive.
5. a kind of super large projection scope projection optical system according to claim 4, which is characterized in that described first is thoroughly
Mirror (1) is plastic cement aspherical lens；Second lens (2), the third lens (3), the 4th lens (4), the 5th lens (5),
7th lens (7), the 9th lens (9), the tenth lens (10), the 11st lens (11) and the 12nd lens (12) are glass spherical surface
Eyeglass, the 11st lens (11) and the 12nd lens (12) are bonded by optical glue；6th lens (6),
8th lens (8) and the 13rd lens (13) are Glass aspheric eyeglass.
6. a kind of super large projection scope projection optical system according to claim 4, which is characterized in that first lens
(1), the 6th lens (6), the 8th lens (8) and the 13rd lens (13) are aspherical lens, first lens (1),
The aspherical surface shape of six lens (6), the 8th lens (8) and the 13rd lens (13) meets following equation：
In above-mentioned formula, parameter c is curvature corresponding to radius, and y is that its unit of radial coordinate is identical with length of lens unit, k
For circular cone whose conic coefficient；When k-factor is less than -1, the face shape curve of lens is hyperbola, when k-factor is equal to -1, thoroughly
The face shape curve of mirror is parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, when k-factor is equal to 0
When, the face shape curve of lens is circle, and when k-factor is greater than 0, the face shape curve of lens is oblateness；a1To a8It respectively indicates each
Coefficient corresponding to radial coordinate.
7. a kind of super large projection scope projection optical system according to claim 1, which is characterized in that the DMD core
Piece (100) is placed relative to optical axis bias, and the center line of dmd chip (100) and the deviation distance of optical axis are 5.65mm.
8. a kind of super large projection scope projection optical system according to claim 1, which is characterized in that the reflecting mirror
It (300) is non-spherical reflector, focal power is negative.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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2018
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Cited By (2)
| 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 |
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