CN108303784A - A kind of ultrashort out-of-focus projection's optical system - Google Patents
A kind of ultrashort out-of-focus projection's optical system Download PDFInfo
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- CN108303784A CN108303784A CN201810255795.9A CN201810255795A CN108303784A CN 108303784 A CN108303784 A CN 108303784A CN 201810255795 A CN201810255795 A CN 201810255795A CN 108303784 A CN108303784 A CN 108303784A
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- lens
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- optical system
- focus projection
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Classifications
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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
- G02B13/001—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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
-
- 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
-
- 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
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a kind of ultrashort out-of-focus projection's optical systems, are disposed on projecting direction：Dmd chip, equivalent prism, refractor component and non-spherical reflector；The refractor component includes the first lens, the second lens, the third lens, the 4th lens and the 5th lens set gradually along projecting direction；Diaphragm, the 6th lens, the 7th lens, the 8th lens, the 9th lens, the tenth lens, the 11st lens and the 12nd lens.High resolution of the invention, projection are not run coke for convex surface even aspheric surface, high temperature than being less than 0.2, speculum, be can be mass.
Description
【Technical field】
The present invention relates to the optical system in shadow casting technique, especially a kind of ultrashort out-of-focus projection's optical system.
【Background technology】
Recently as the development of shadow casting technique, ultra-short focus projection lens are applied to laser television and height extensively
On brightness projection machine, ultra-short focus projection lens currently on the market have the disadvantage that：
1, using the ultrashort zoom lens of refraction type, projection ratio cannot be satisfied user in household 50cm width 0.45 or more
Cabinet for TV on, launch 100 cun or more of big picture, and in order to control distortion, manufacture degree of difficulty is high.
2, using the hybrid ultrashort zoom lens of catadioptric, speculum is free form surface, and manufacture difficulty is high.
3, using the hybrid ultrashort zoom lens of catadioptric, speculum is concave surface free form surface, peripheral image confrontation free form surface
Face type require high, correct difficult, so periphery image quality is usually bad, production yield can not also ensure.
4, it is aspherical to be all made of plastic cement for ultrashort zoom lens in the market, more sensitive to high temperature, and projector is easy when working
It runs burnt.
Therefore, the present invention is based on above deficiency and generates.
【Invention content】
The technical problem to be solved in the present invention is to provide a kind of high-resolution, projection is than being that convex surface is even less than 0.2, speculum
Secondary aspherical, high temperature does not run ultrashort out-of-focus projection's optical system that is burnt, can be mass.
In order to solve the above technical problems, present invention employs following technical proposals：A kind of ultrashort out-of-focus projection's optical system,
It is characterized in that, is disposed on projecting direction：Dmd chip, equivalent prism, refractor component and non-spherical reflector；
The refractor component includes the first lens set gradually along projecting direction, the second lens, the third lens,
Four lens and the 5th lens；Diaphragm, the 6th lens, the 7th lens, the 8th lens, the 9th lens, the tenth lens, the 11st lens
With the 12nd lens.
A kind of ultrashort out-of-focus projection's optical system as described above, which is characterized in that first power of lens be just,
Second power of lens is negative, and the focal power of the third lens is just that the 4th power of lens is negative, institute
It is that just, the 6th power of lens be negative, and the 7th power of lens is described for just to state the 5th power of lens
8th power of lens is negative, and the 9th power of lens is negative, and the tenth power of lens is just described the
11 power of lens are just that the 12nd power of lens is negative.
A kind of ultrashort out-of-focus projection's optical system as described above, which is characterized in that the Abbe number vd of the second lens2And third
The Abbe number vd of lens3Meet：57≤vd3-vd2≤60；The Abbe number vd of the third lens3With the Abbe number vd of the 4th lens4It is full
Foot：54≤vd3-vd4≤57；The non-spherical reflector is convex surface even aspheric surface, and focal power meets：-0.035≤φ130
≤-0.03。
A kind of ultrashort out-of-focus projection's optical system as described above, which is characterized in that the two sides of the 12nd lens is bent towards
Dmd chip, focal power meet：-0.013≤φ12≤ -0.012, the 12nd lens at a distance from dmd chip be L, dmd chip with
The distance at non-spherical reflector center is LA, is met：L/LA>1.5.
A kind of ultrashort out-of-focus projection's optical system as described above, which is characterized in that second lens and the third are saturating
Mirror is bonded by optical glue, and the third lens are bonded with the 4th lens by optical glue.
A kind of ultrashort out-of-focus projection's optical system as described above, which is characterized in that first lens are glass aspheric
Face, the 12nd lens are that plastic cement is aspherical, and non-spherical reflector is that plastic cement is aspherical.
A kind of ultrashort out-of-focus projection's optical system as described above, which is characterized in that first lens, the 12nd lens
Meet following equation with the aspherical surface shape of non-spherical reflector：
Parameter c is the curvature corresponding to radius in aforesaid equation, 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 more than 0, the face shape curve of lens is oblateness；α1To α8Respectively
Indicate the even aspheric surface coefficient corresponding to each radial coordinate.
Compared with prior art, a kind of ultrashort out-of-focus projection's optical system of the invention, has reached following effect：
1, the present invention realizes 0.2 or less and projects ratio, and coke is not run under the condition of high temperature while aspherical using plastic cement.
2, the present invention uses convex surface even aspheric surface speculum, avoids free form surface, handling ease, and opposed concave
The face type susceptibility of non-spherical reflector is low, is suitable for batch production.
【Description of the drawings】
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings, wherein：
Fig. 1 is schematic diagram of the present invention；
Fig. 2 is light path schematic diagram of the present invention；
Description of the drawings：100, dmd chip；110, equivalent prism；120, refractor component；130, non-spherical reflector；
1, the first lens；2, the second lens；3, the third lens；4, the 4th lens；5, the 5th lens；6, the 6th lens；7, the 7th lens；
8, the 8th lens；9, the 9th lens；10, the tenth lens；11,11 lens；12, the 12nd lens；13, diaphragm.
【Specific implementation mode】
It elaborates below in conjunction with the accompanying drawings to embodiments of the present invention.
As depicted in figs. 1 and 2, a kind of ultrashort out-of-focus projection's optical system, is disposed on projecting direction：Dmd chip
100, equivalent prism 110, refractor component 120 and non-spherical reflector 130；
The refractor component 120 includes that the first lens 1, the second lens 2, third that set gradually along projecting direction are saturating
Mirror 3, the 4th lens 4 and the 5th lens 5；Diaphragm 13, the 6th lens 6, the 7th lens 7, the 8th lens 8, the 9th lens the 9, the tenth
Lens 10, the 11st lens 11 and the 12nd lens 12.
As depicted in figs. 1 and 2, in the present embodiment, the focal power of first lens 1 be just, second lens 2
Focal power is negative, and the focal power of the third lens 3 is just that the focal power of the 4th lens 4 is negative, the 5th lens 5
Focal power be that just, the focal powers of the 6th lens 6 be negative, and the focal powers of the 7th lens 7 is just, the 8th lens
8 focal power is negative, and the focal power of the 9th lens 9 is negative, and the focal power of the tenth lens 10 is the just the described 11st
The focal power of lens 11 is just that the focal power of the 12nd lens 12 is negative.
In the present embodiment, image strip is sent out from dmd chip 100, to approach directional light after equivalent prism 110
Angle enters refractor component 120, and first time imaging is carried out between refractor component 120 and non-spherical reflector 130,
First time imaging is reflexed to the image that projection screen forms high quality by non-spherical reflector 130.
As depicted in figs. 1 and 2, in the present embodiment, the first lens 1 use Glass aspheric, correct the astigmatism of big visual field,
Second lens 2, the third lens 3 and the 4th lens 4 form three balsaming lens, and axial chromatic aberration and off-axis chromatic aberration to system carry out school
Just, ensure the reproducibility of color；8th lens 8 and the 9th lens 9 are used close to symmetrical shape, for promoting visual field outside axis
Size so that camera lens has larger projection ratio；The use of 12nd lens 12 is aspherical, and aberration school is carried out to visual field outside the axis of amplification
Just, the advanced distortion brought by visual field amplification and advanced astigmatism are corrected, it is right by placing convex reflecting mirror on refraction path
Distortion and astigmatism are further corrected, and the image of high quality is finally formed at screen.
As depicted in figs. 1 and 2, in the present embodiment, the Abbe number vd of the second lens 22With the Abbe number vd of the third lens 33
Meet：57≤vd3-vd2≤60；The Abbe number vd of the third lens 33With the Abbe number vd of the 4th lens 44Meet：54≤vd3-vd4
≤57；The non-spherical reflector 130 is convex surface even aspheric surface, and focal power meets：-0.035≤φ130≤ -0.03, can
The optical path difference for reducing peripheral field and central vision, keeps the sensitivity of the image quality opposite type of mirror edge visual field low, significantly drops
The sensitivity of the build-up tolerance of low system can carry out mass production.
As depicted in figs. 1 and 2, in the present embodiment, the two sides of the 12nd lens 12 bends towards dmd chip 100, light focus
Degree meets：-0.013≤φ12≤ -0.012, the 12nd lens 12 are L, dmd chip 100 and aspheric at a distance from dmd chip 100
The distance at 130 center of face speculum is LA, is met：L/LA>1.5 under projector's condition of high temperature, it can be achieved that do not run coke.
As depicted in figs. 1 and 2, in the present embodiment, second lens 2 pass through optical glue with the third lens 3
Bonding, the third lens 3 are bonded with the 4th lens 4 by optical glue.
As depicted in figs. 1 and 2, in the present embodiment, first lens 1 are Glass aspheric, the 12nd lens 12
Aspherical for plastic cement, non-spherical reflector 130 is that plastic cement is aspherical.
As depicted in figs. 1 and 2, in the present embodiment, first lens 1, the 12nd lens 12 and non-spherical reflector
130 aspherical surface shape meets following equation：
Parameter c is the curvature corresponding to radius in aforesaid equation, 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 more than 0, the face shape curve of lens is oblateness；α1To α8Respectively
Indicate the even aspheric surface coefficient corresponding to each radial coordinate.
Following case is the actual design parameter of 0.2 ultrashort zoom lens of the projection than P：
The coefficient of non-spherical reflector S1 is：
k：-17.01562
a1：0
a2：9.4949766e-008
a3：-3.1015008e-011
a4：2.4742502e-014
a5：-4.511753e-018
a6：1.1123599e-022
a7：9.4602141e-026；
The coefficient of first face S23 of the 12nd lens 12 is：
k：223.459
a1：0
a2：1.7833543e-006
a3：-1.38904e-008
a4：9.1287395e-011
a5：1.6443535e-013
a6：1.5776928e-016
a7：-1.906172e-018
a8：-2.4516764e-022；
The coefficient of second face S24 of the 12nd lens 12 is：
k：-0.3118853
a1：0
a2：-1.1445681e-005
a3：3.0836874e-007
a4：-2.1372203e-009
a5：4.7401379e-011
a6：-9.3909422e-014
a7：-8.6871391e-017
a8：-9.1956209e-019.
Claims (7)
1. a kind of ultrashort out-of-focus projection's optical system, which is characterized in that be disposed on projecting direction：Dmd chip (100),
Equivalent prism (110), refractor component (120) and non-spherical reflector (130)；
The refractor component (120) includes the first lens (1), the second lens (2), third set gradually along projecting direction
Lens (3), the 4th lens (4) and the 5th lens (5)；Diaphragm (13), the 6th lens (6), the 7th lens (7), the 8th lens
(8), the 9th lens (9), the tenth lens (10), the 11st lens (11) and the 12nd lens (12).
2. a kind of ultrashort out-of-focus projection's optical system according to claim 1, which is characterized in that first lens (1)
Focal power is that just, the focal power of second lens (2) is negative, and the focal power of the third lens (3) is that just, the described 4th thoroughly
The focal power of mirror (4) is negative, and the focal power of the 5th lens (5) is just that the focal power of the 6th lens (6) is negative, institute
The focal power for stating the 7th lens (7) is just that the focal power of the 8th lens (8) is negative, the focal power of the 9th lens (9)
It is negative, the focal power of the tenth lens (10) is that just, the focal power of the 11st lens (11) is that just, the described 12nd thoroughly
The focal power of mirror (12) is negative.
3. a kind of ultrashort out-of-focus projection's optical system according to claim 2, which is characterized in that the Abbe of the second lens (2)
Number vd2With the Abbe number vd of the third lens (3)3Meet：57≤vd3-vd2≤60；The Abbe number vd of the third lens (3)3With the 4th
The Abbe number vd of lens (4)4Meet：54≤vd3-vd4≤57；The non-spherical reflector (130) is convex surface even aspheric
Face, focal power meet：-0.035≤φ130≤-0.03。
4. a kind of ultrashort out-of-focus projection's optical system according to claim 2, which is characterized in that the 12nd lens (12)
Two sides bend towards dmd chip (100), focal power meets：-0.013≤φ12≤ -0.012, the 12nd lens (12) and dmd chip
(100) distance is L, and dmd chip (100) is LA at a distance from non-spherical reflector (130) center, is met：L/LA>1.5.
5. a kind of ultrashort out-of-focus projection's optical system according to claim 1, which is characterized in that second lens (2) with
The third lens (3) are bonded by optical glue, and the third lens (3) are bonded with the 4th lens (4) by optical glue.
6. a kind of ultrashort out-of-focus projection's optical system according to claim 1, which is characterized in that first lens (1)
For Glass aspheric, the 12nd lens (12) are that plastic cement is aspherical, and non-spherical reflector (130) is that plastic cement is aspherical.
7. a kind of ultrashort out-of-focus projection's optical system according to claim 1, which is characterized in that first lens (1),
The aspherical surface shape of 12nd lens (12) and non-spherical reflector (130) meets following equation：
Parameter c is the curvature corresponding to radius in aforesaid equation, its unit is identical with length of lens unit for radial coordinate by y, 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 more than 0, the face shape curve of lens is oblateness；α1To α8It indicates respectively each
Even aspheric surface coefficient corresponding to radial coordinate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810255795.9A CN108303784A (en) | 2018-03-27 | 2018-03-27 | A kind of ultrashort out-of-focus projection's optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810255795.9A CN108303784A (en) | 2018-03-27 | 2018-03-27 | A kind of ultrashort out-of-focus projection's optical system |
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| CN108303784A true CN108303784A (en) | 2018-07-20 |
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ID=62847938
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| CN201810255795.9A Pending CN108303784A (en) | 2018-03-27 | 2018-03-27 | A kind of ultrashort out-of-focus projection's optical system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298512A (en) * | 2018-12-04 | 2019-02-01 | 湖州清维电子科技有限公司 | A kind of short focus engineering projection lens |
| CN111580267A (en) * | 2020-06-29 | 2020-08-25 | 歌尔光学科技有限公司 | Optical system and projection device |
| CN111897182A (en) * | 2020-09-10 | 2020-11-06 | 深圳市点睛创视技术有限公司 | Ultrashort-focus objective lens system for miniature projection |
| CN112230376A (en) * | 2020-10-30 | 2021-01-15 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
| CN112230377A (en) * | 2020-10-30 | 2021-01-15 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
| CN112363299A (en) * | 2020-11-16 | 2021-02-12 | 中山联合光电研究院有限公司 | Ultrashort burnt projection optical lens and ultrashort burnt projection optical system |
| WO2024212344A1 (en) * | 2023-04-10 | 2024-10-17 | 沂普光电(天津)有限公司 | Low throw ratio optical system |
-
2018
- 2018-03-27 CN CN201810255795.9A patent/CN108303784A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298512A (en) * | 2018-12-04 | 2019-02-01 | 湖州清维电子科技有限公司 | A kind of short focus engineering projection lens |
| CN111580267A (en) * | 2020-06-29 | 2020-08-25 | 歌尔光学科技有限公司 | Optical system and projection device |
| CN111580267B (en) * | 2020-06-29 | 2022-03-22 | 歌尔光学科技有限公司 | Optical system and projection device |
| CN111897182A (en) * | 2020-09-10 | 2020-11-06 | 深圳市点睛创视技术有限公司 | Ultrashort-focus objective lens system for miniature projection |
| CN111897182B (en) * | 2020-09-10 | 2022-02-11 | 深圳市点睛创视技术有限公司 | Ultrashort-focus objective lens system for miniature projection |
| CN112230376A (en) * | 2020-10-30 | 2021-01-15 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
| CN112230377A (en) * | 2020-10-30 | 2021-01-15 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
| CN112230377B (en) * | 2020-10-30 | 2021-09-24 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
| CN112230376B (en) * | 2020-10-30 | 2021-10-01 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
| CN112363299A (en) * | 2020-11-16 | 2021-02-12 | 中山联合光电研究院有限公司 | Ultrashort burnt projection optical lens and ultrashort burnt projection optical system |
| WO2024212344A1 (en) * | 2023-04-10 | 2024-10-17 | 沂普光电(天津)有限公司 | Low throw ratio optical system |
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