CN108398846B - Ultra-large projection range projection optical system - Google Patents

Ultra-large projection range projection optical system Download PDF

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Publication number
CN108398846B
CN108398846B CN201810467887.3A CN201810467887A CN108398846B CN 108398846 B CN108398846 B CN 108398846B CN 201810467887 A CN201810467887 A CN 201810467887A CN 108398846 B CN108398846 B CN 108398846B
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lens
focal power
lens group
dmd chip
group
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CN108398846A (en
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李源财
龚俊强
李建华
全丽伟
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Union Optech Co Ltd
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Union Optech Co Ltd
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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
    • G02B13/0045—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 five or more lenses
    • 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

Abstract

The invention discloses a projection optical system with an ultra-large projection range, which comprises a DMD chip and a reflector, wherein a first lens group which is static relative to the DMD chip is arranged between the DMD chip and the reflector, the focal power of the first lens group is negative, a second lens group which can move between the first lens group of the DMD chip is arranged between the DMD chip and the first lens group, the focal power of the second lens group is positive, a third lens group which can move between the DMD chip and the second lens group is arranged between the DMD chip and the second lens group, the focal power of the third lens group is negative, a fourth lens group which is static relative to the DMD chip is arranged between the DMD chip and the third lens group, and the focal power of the fourth lens group is positive. The invention has the advantages of high resolution, high definition, large projection range, less than 0.2 projection ratio and the like, and can be produced in batch.

Description

Ultra-large projection range projection optical system
Technical Field
The present invention relates to an optical system, and more particularly, to an ultra-large projection range projection optical system.
Background
With the development of projection technology in recent years, projectors have been widely used in the fields of home use, education, office use, and the like. Projectors with ultra-large screen effects and close prices are becoming more popular with consumers than expensive lcd televisions. The high definition serves as a continuous advancing direction of the projector, and the ultra-short focus is a necessary trend of future development of the projector. The application of the ultra-short-focus technology enables the projector to obtain the same or even larger projection picture under the shorter projection distance, and can be better utilized in a compact space environment. The main current market technology is to adopt reflective projection, so that the projection ratio of the projector is below 0.4, and the projection effect of ultra-short focus is realized.
The ultrashort-focus projector on the market at present has the following defects: 1. the supportable projection pictures are 80-120 inches, only a few of the supportable projection pictures can reach 150 inches, the projection range is small, and larger projection pictures can not be supported; 2. although a projection range of 80-150 inches can be supported, a focusable range alone does not actually guarantee a global performance of 80-150 inches; 3. most projectors use plastic aspheric surfaces to reduce cost, and the projectors generate heat at high temperature for a long time, so that the projectors are Wen Xujiao; there is no projector on the market that solves the above defects at the same time.
Disclosure of Invention
In view of the above, the present invention is directed to a projection optical system with ultra-large projection range,
the invention adopts the technical proposal for solving the technical problems that:
the utility model provides an ultra-large projection scope projection optical system, includes DMD chip and speculum, be provided with the stationary first lens group of relative DMD chip between DMD chip and the speculum, the focal power of first lens group is negative, be provided with the second lens group that can remove between the first lens group of DMD chip between DMD chip and the first lens group, the focal power of second lens group is positive, be provided with the third lens group that can remove between DMD chip and second lens group between DMD chip and the second lens group, the focal power of third lens group is negative, be provided with the stationary fourth lens group of relative DMD chip between DMD chip and the third lens group, the focal power of fourth lens group is positive.
Preferably, the focal power of the first lens group is-0.01-0.00; the focal power of the second lens group is 0.01-0.02; the focal power of the third lens group is-0.02 to-0.01; the focal power of the fourth lens group is 0.05-0.06.
Preferably, the focal power of the second lens group is recorded asThe focal power of the third lens group is recorded as +.>And->The mathematical relationship of (a) is: />
Preferably, the first lens group includes a first lens, a second lens and a third lens sequentially arranged along a direction towards the DMD chip, the focal power of the first lens is positive, the focal power of the second lens is negative, and the focal power of the third lens is positive; the second lens group comprises a fourth lens with positive focal power; the third lens group comprises a fifth lens with negative focal power; the fourth lens group comprises a sixth lens, a seventh lens, a diaphragm, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens which are sequentially arranged along the direction towards the DMD chip, wherein the focal power of the sixth lens is negative, the focal power of the seventh lens is positive, the focal power of the eighth lens is negative, the focal power of the ninth lens is positive, the focal power of the tenth lens is negative, the focal power of the eleventh lens is positive, the focal power of the twelfth lens is positive and the focal power of the thirteenth lens is positive.
Preferably, the first lens is a plastic aspherical lens; the second lens, the third lens, the fourth lens, the fifth lens, the seventh lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens are glass spherical lenses, and the eleventh lens and the twelfth lens are bonded through optical glue; the sixth lens, the eighth lens and the thirteenth lens are glass aspheric lenses.
Preferably, the first lens, the sixth lens, the eighth lens and the thirteenth lens are aspherical lenses, and the aspherical surface shapes of the first lens, the sixth lens, the eighth lens and the thirteenth lens satisfy the following equation:
in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, the unit of the radial coordinate is the same as the unit of the lens length, and k is the conic coefficient; when the k coefficient is smaller than-1, the face of the lensThe shape curve is a hyperbola, and when the k coefficient is equal to-1, the shape curve of the lens is parabolic; when the k coefficient is between-1 and 0, the surface shape curve of the lens is elliptical, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, and when the k coefficient is greater than 0, the surface shape curve of the lens is oblate; a, a 1 To a 8 The coefficients corresponding to the radial coordinates are respectively represented.
Preferably, the DMD chip is eccentrically disposed with respect to the optical axis, and the offset distance between the center line of the DMD chip and the optical axis is 5.65mm.
Preferably, the mirror is an aspherical mirror, the optical power of which is negative.
The beneficial effects of the invention are as follows:
1. the invention has the projection ratio smaller than 0.2, the effective projection distance range of 0.38-1.5 m, supports the effective projection of the picture of 80-300 inches, and has the characteristic of ultra-large projection range.
2. The invention reasonably distributes the focal power of each lens to ensure that the two linkage groups, namely the focal power of the second lens groupAnd the third lens group power->The ratio of (2) satisfies the following relationship: />Meanwhile, the aspheric surface is reasonably matched, so that distortion and aberration can be well corrected; the aberration change is balanced under the condition that the projection system projects pictures with different sizes at different object distances. The projection system can effectively support the projection range of 80-300 inches, achieves the effect of the ultra-large projection range, and simultaneously ensures the effects of high resolution and high definition in the whole range.
3. According to the invention, the plastic aspheric surface is reasonably adopted, and the glass lens and the plastic lens are simultaneously used in a mixed mode, so that the expansion amount of the lens surface and the aberration change caused by the expansion amount of the lens surface are mutually counteracted in a high-temperature environment of the projection system. The cost is reduced, and meanwhile, the phenomenon of no virtual focus at a high temperature is realized.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is an optical diagram of a system of the present invention;
FIG. 2 is an optical view of a second lens group;
FIG. 3 is a system light path diagram of the present invention;
fig. 4 is an enlarged partial schematic view of the portion a in fig. 3.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
referring to fig. 1 to 3, an embodiment of the present invention proposes an ultra-large projection range projection optical system including a DMD chip 100 and a mirror 300, a first lens group 210 stationary with respect to the DMD chip 100 is disposed between the DMD chip 100 and the mirror 300, optical power of the first lens group 210 is negative, a second lens group 220 movable between the first lens group 210 of the DMD chip 100 along a center line of the DMD chip is disposed between the DMD chip 100 and the first lens group 210, optical power of the second lens group 220 is positive, a third lens group 230 movable between the DMD chip 100 and the second lens group 220 along a center line of the DMD chip is disposed between the DMD chip 100 and the second lens group 220, optical power of the third lens group 230 is negative, a fourth lens group 240 stationary with respect to the DMD chip 100 is disposed between the DMD chip 100 and the third lens group 230, and optical power of the fourth lens group 240 is positive.
In this embodiment, the DMD chip (100) is disposed eccentrically with respect to the optical axis, such that the center line of the DMD chip 100 is offset from the optical axis by 5.65mm. The focal power of the first lens group 210 is-0.01-0.00; the focal power of the second lens group 220 is 0.01-0.02; the focal power of the third lens group 230 is-0.02 to-0.01; the optical power of the fourth lens group 240 is 0.05-0.06. The second lens group 220 and the third lens group 230 are linked groups, and the focal power of the second lens group 220 is recorded asThe optical power of the third lens group 230 is recorded as +.>The optical design software is used for optimally combining various design parameters of the projection system, the focal power of each lens is reasonably distributed, and the ratio of the focal power of the two linkage groups, namely the second lens group and the third lens group, meets the following relational expression:the projection system has the characteristic of ultra-large projection range, can effectively support the projection range of 80-300 inches, ensures reasonable deflection angle distribution of light on each lens, ensures good manufacturability under the condition of using fewer aspheric surfaces and having optimal imaging effect, and meets the requirement of mass production of products.
Referring to fig. 1, the first lens group 210 includes a first lens 1, a second lens 2 and a third lens 3 sequentially arranged in a direction toward the DMD chip 100, wherein the optical power of the first lens 1 is positive, the optical power of the second lens 2 is negative, and the optical power of the third lens 3 is positive; the second lens group 220 includes a fourth lens 4 with positive optical power; the third lens group 230 includes a fifth lens 5 having negative optical power; the fourth lens group 240 includes a sixth lens 6, a seventh lens 7, a diaphragm 14, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, and a thirteenth lens 13, which are sequentially disposed in a direction toward the DMD chip 100, the focal power of the sixth lens 6 is negative, the focal power of the seventh lens 7 is positive, the focal power of the eighth lens 8 is negative, the focal power of the ninth lens 9 is positive, the focal power of the tenth lens 10 is negative, the focal power of the eleventh lens 11 is positive, the focal power of the twelfth lens 12 is positive, and the focal power of the thirteenth lens 13 is positive.
In this embodiment, the reflecting mirror 300 is a crescent-shaped aspheric plastic lens, the focal power of which is negative, and when realizing large-angle deflection of light, the distortion and astigmatism of the light with large angle can be corrected at the same time, so that the light entering the rear group has smaller angle and residual aberration, and meanwhile, the cost of the aspheric plastic lens is lower than that of other aspheric lenses, and the design can obviously reduce the cost of the system. The first lens 1 is a plastic aspheric lens; the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the seventh lens 7, the ninth lens 9, the tenth lens 10, the eleventh lens 11 and the twelfth lens 12 are glass spherical lenses, and the eleventh lens 11 and the twelfth lens 12 are bonded through optical glue; the sixth lens 6, the eighth lens 8 and the thirteenth lens 13 are glass aspheric lenses.
The eleventh lens 11 is designed as a glass aspheric lens, and can correct spherical aberration, coma aberration and other aberration of higher light rays, and can realize a large aperture and a better imaging effect by matching with the use of the first lens 1. The bending direction of the eleventh lens 11 deviates from the chip, and is opposite to the first lens 1, so that under the condition that the temperature inside the lens is increased due to long-time use of the projector, the relation of the plastic aspherical expansion coefficient P1 of the first lens 1, the lens temperature T1, the aspherical expansion coefficient P11 of the eleventh lens glass and the lens temperature T11 can be met, and the relation of P1+P11×T11 approximately equal to 0 is satisfied. By combining the plastic aspheric surface and the glass aspheric surface, the phenomenon of system virtual focus is solved, and the optical system is ensured not to be out of focus in a high-temperature state.
Referring to fig. 1, the first, sixth, eighth and thirteenth lenses 1, 6, 8 and 13 are each aspherical lenses, and the aspherical surface shapes of the first, sixth, eighth and thirteenth lenses 1, 6, 8 and 13 satisfy the following equations:
in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, the unit of the radial coordinate is the same as the unit of the lens length, and k is the conic coefficient; when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the face of the lensThe shape curve is elliptical, when the k coefficient is equal to 0, the shape curve of the lens is circular, and when the k coefficient is greater than 0, the shape curve of the lens is oblate; a, a 1 To a 8 The coefficients corresponding to the radial coordinates are respectively represented.
The following examples are: the actual design parameters of the projection lens with the projection screen of 80 to 300 inches can be supported by using the distance of 0.3 to 1.5m and the projection ratio of 0.2:
aspheric coefficients of the respective aspheric surfaces:
the mirror 300 first side S1 factor is:
k＝-768
a 1 ＝0
a 2 ＝0.00011485935
a 3 ＝-5.3053334e-007
a 4 ＝2.126744e-009
a 5 ＝-5.4787393e-012
a 6 ＝8.0470803e-015
a 7 ＝-4.9662071e-018
a 8 ＝0；
the first lens 1 has a first surface S2 coefficient of:
k＝22.275
a 1 ＝0
a 2 ＝0.00014239041
a 3 ＝-4.6197932e-007
a 4 ＝5.2022001e-010
a 5 ＝1.2998783e-011
a 6 ＝-7.5810064e-014
a 7 ＝1.4883303e-016
a 8 ＝0；
the second surface S3 coefficient of the first lens 1 is:
k＝-565.9319
a 1 ＝0
a 2 ＝-4.6842153e-006
a 3 ＝1.3583932e-008
a 4 ＝2.96366079486753e-012
a 5 ＝2.35668648024052e-015
a 6 ＝-1.7709563837241e-019
a 7 ＝-6.05918030192083e-022
a 8 ＝0；
the sixth lens 6 has a first surface S12 coefficient of:
k＝-0.4040741
a 1 ＝0
a 2 ＝4.90490480030574e-007
a 3 ＝-2.05760498407608e-010
a 4 ＝2.99679825125034e-014
a 5 ＝5.55711304020551e-018
a 6 ＝-2.86845642405709e-021
a 7 ＝2.91053534222281e-025
a 8 ＝0；
the second surface S13 coefficient of the sixth lens 6 is:
k＝90.3686
a 1 ＝0
a 2 ＝3.37355419190151e-008
a 3 ＝-1.68426620586378e-010
a 4 ＝-1.77578855135222e-011
a 5 ＝1.31858269908392e-013
a 6 ＝1.61679421023673e-016
a 7 ＝-3.13849187032395e-018
a 8 ＝0；
the eighth lens 8 has a first surface S17 coefficient of:
k＝-1.3840751
a 1 ＝0
a 2 ＝-2.79361010729748e-008
a 3 ＝-6.6497057344366e-010
a 4 ＝-2.54430577284334e-013
a 5 ＝-1.84664483140541e-015
a 6 ＝6.46082131490784e-017
a 7 ＝-1.54392143969012e-019
a 8 ＝0；
the eighth lens 8 second surface S18 coefficient is:
k＝-25.2567
a 1 ＝0
a 2 ＝4.90490480030574e-007
a 3 ＝-3.94843412007971e-010
a 4 ＝3.02112629843759e-013
a 5 ＝1.40840432176276e-015
a 6 ＝6.90569325719901e-019
a 7 ＝-6.52550386131808e-021
a 8 ＝0；
the thirteenth lens 13 has a first surface S26 coefficient of:
k＝-12.457
a 1 ＝0
a 2 ＝4.904900574e-007
a 3 ＝-2.05760908e-010
a 4 ＝2.99679824e-014
a 5 ＝-7.4255518e-16
a 6 ＝1.3859057e-18
a 7 ＝1.8118184e-23
a 8 ＝0；
the thirteenth lens 13 has a second surface S27 coefficient of:
k＝-1.4040741
a 1 ＝0
a 2 ＝-5.2362612e-06
a 3 ＝-2.057608e-010
a 4 ＝2.9244063e-09
a 5 ＝5.5046807e-16
a 6 ＝5.5046807e-16
a 7 ＝4.8296771e-18
a 8 ＝0。

Claims (4)

1. the ultra-large projection range projection optical system is characterized by comprising a DMD chip (100) and a reflecting mirror (300), wherein a first lens group (210) which is static relative to the DMD chip (100) is arranged between the DMD chip (100) and the reflecting mirror (300), the focal power of the first lens group (210) is negative, a second lens group (220) which can move between the first lens group (210) of the DMD chip (100) is arranged between the DMD chip (100) and the first lens group (210), the focal power of the second lens group (220) is positive, a third lens group (230) which can move between the DMD chip (100) and the second lens group (220) is arranged between the DMD chip (100) and the second lens group (220), the focal power of the third lens group (230) is negative, and a fourth lens group (240) which is static relative to the DMD chip (100) is arranged between the DMD chip (100) and the third lens group (230);
the focal power of the first lens group (210) is-0.01-0.00; the focal power of the second lens group (220) is 0.01-0.02; the focal power of the third lens group (230) is-0.02 to-0.01; the focal power of the fourth lens group (240) is 0.05-0.06;
the focal power of the second lens group (220) is recorded asThe focal power of the third lens group (230) is recorded asAnd->The mathematical relationship of (a) is: />
The first lens group (210) comprises a first lens (1), a second lens (2) and a third lens (3) which are sequentially arranged along the direction towards the DMD chip (100), wherein the focal power of the first lens (1) is positive, the focal power of the second lens (2) is negative, and the focal power of the third lens (3) is positive; the second lens group (220) comprises a fourth lens (4) with positive focal power; the third lens group (230) comprises a fifth lens (5) with negative focal power; the fourth lens group (240) comprises a sixth lens (6), a seventh lens (7), a diaphragm (14), an eighth lens (8), a ninth lens (9), a tenth lens (10), an eleventh lens (11), a twelfth lens (12) and a thirteenth lens (13) which are sequentially arranged along the direction towards the DMD chip (100), the focal power of the sixth lens (6) is negative, the focal power of the seventh lens (7) is positive, the focal power of the eighth lens (8) is negative, the focal power of the ninth lens (9) is positive, the focal power of the tenth lens (10) is negative, the focal power of the eleventh lens (11) is positive, the focal power of the twelfth lens (12) is positive, and the focal power of the thirteenth lens (13) is positive;
the first lens (1) is a plastic aspheric lens; the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the seventh lens (7), the ninth lens (9), the tenth lens (10), the eleventh lens (11) and the twelfth lens (12) are glass spherical lenses, and the eleventh lens (11) and the twelfth lens (12) are bonded through optical glue; the sixth lens (6), the eighth lens (8) and the thirteenth lens (13) are glass aspheric lenses.
2. An ultra-large projection range projection optical system according to claim 1, wherein the first lens (1), the sixth lens (6), the eighth lens (8) and the thirteenth lens (13) are each aspherical lenses, and the aspherical surface shapes of the first lens (1), the sixth lens (6), the eighth lens (8) and the thirteenth lens (13) satisfy the following equations:
in the equation, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, the unit of y is the same as the unit of the lens length, and k is the conic coefficient; when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface shape curve of the lens is elliptical, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, and when the k coefficient is greater than 0, the surface shape curve of the lens is oblate; a, a 1 To a 8 The coefficients corresponding to the radial coordinates are respectively represented.
3. The ultra-large projection range projection optical system according to claim 1, wherein the DMD chip (100) is disposed eccentrically with respect to the optical axis, and the center line of the DMD chip (100) is offset from the optical axis by a distance of 5.65mm.
4. The ultra-large projection range projection optical system according to claim 1, wherein the mirror (300) is an aspherical mirror, and the optical power thereof is negative.
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CN113534418B (en) * 2021-09-07 2021-12-07 沂普光电(天津)有限公司 Ultrashort burnt camera lens subassembly

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JP2005292813A (en) * 2004-03-12 2005-10-20 Sony Corp Projection optical system and image projector
CN107065406A (en) * 2017-03-21 2017-08-18 北京和光科技有限公司 A kind of universal short focus projection optical system
CN208110242U (en) * 2018-05-16 2018-11-16 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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Publication number Priority date Publication date Assignee Title
JPH11202200A (en) * 1998-01-13 1999-07-30 Nikon Corp Zoom lens
JP2001215410A (en) * 2000-01-28 2001-08-10 Tochigi Nikon Corp Zoom lens and projection type display device provided with the same
JP2005292813A (en) * 2004-03-12 2005-10-20 Sony Corp Projection optical system and image projector
CN107065406A (en) * 2017-03-21 2017-08-18 北京和光科技有限公司 A kind of universal short focus projection optical system
CN208110242U (en) * 2018-05-16 2018-11-16 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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