CN108303783A - A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula - Google Patents
A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula Download PDFInfo
- Publication number
- CN108303783A CN108303783A CN201810252127.0A CN201810252127A CN108303783A CN 108303783 A CN108303783 A CN 108303783A CN 201810252127 A CN201810252127 A CN 201810252127A CN 108303783 A CN108303783 A CN 108303783A
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- China
- Prior art keywords
- optical system
- aspheric surface
- light path
- multiple reflection
- lens
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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
- G02B13/0055—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
Abstract
The invention discloses a kind of ultrashort out-of-focus projection's optical systems of multiple reflection formula, and refractive optical element, plane mirror, convex aspheric surface speculum and perspective plane are set gradually according to projecting light path；Plane mirror is arranged in the top of refractive optical element and transfers to light path, and convex aspheric surface speculum is placed on plane mirror reflected light path, perspective plane is arranged on convex aspheric surface speculum reflected light path.The present invention adds the secondary reflection mode of convex aspheric surface speculum using plane mirror, greatly shortens optical system at a distance from perspective plane, improves projection ratio, and optical system is less than 30CM at a distance from perspective plane, and projection ratio can support 0.18 or less.The present invention uses convex surface even aspheric surface speculum, easy to process.
Description
【Technical field】
The present invention relates to a kind of ultrashort out-of-focus projection's optical system, more precisely a kind of ultrashort out-of-focus projection's light of multiple reflection formula
System.
【Background technology】
Ultra short focal projector has been widely used in household and office realm at present, but current ultrashort out-of-focus projection's optics
System has the following disadvantages：
1, the hybrid ultrashort out-of-focus projection's optical system of catadioptric, camera lens refracted portion and reflective portion are coaxial, cause volume
Larger, optical system light extraction end distance projection metope is remote, projects than small, wasting space.
2, the projection of refraction type ultrashort out-of-focus projection's optical system is than being more than 0.4, when projected picture, is not close enough to, leads apart from metope
Projected picture is caused to be easy to be blocked, user experience effect is poor.
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 ultrashort out-of-focus projection's optical system of multiple reflection formula, the optical systems
System can greatly shorten ultrashort out-of-focus projection's optical system at a distance from projection metope, improve projection ratio.
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 of multiple reflection formula, it is characterised in that set gradually refraction type light according to projecting light path
Learn component, plane mirror, convex aspheric surface speculum and perspective plane；Plane mirror is arranged in the upper of refractive optical element
Side simultaneously transfers to light path, and convex aspheric surface speculum, convex aspheric surface reflection are placed on plane mirror reflected light path
Perspective plane is set on mirror reflected light path.
A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula as described above, it is characterised in that perspective plane and refractive optical
The optical axis of component is parallel.
A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula as described above, it is characterised in that the convex aspheric surface reflection
Distance of the mirror apart from perspective plane is less than 30C.
A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula as described above, it is characterised in that the refractive optical element
For telecentricity framework or non-telecentricity framework.
A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula as described above, it is characterised in that the convex aspheric surface is anti-
The surface shape for penetrating mirror meets following equation：
In formula, parameter c is the curvature corresponding to radius, its unit is identical with length of lens unit for radial coordinate by y,
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, 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；a1To a8It indicates respectively each
Even aspheric surface coefficient corresponding to 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 adds the secondary reflection mode of convex aspheric surface speculum using plane mirror, greatly shortens light
System improves projection ratio at a distance from perspective plane, and optical system is less than 30CM at a distance from perspective plane, and projection ratio can be supported
0.18 or less.
2, the present invention uses convex surface even aspheric surface speculum, easy to process.
【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；
Description of the drawings：1, optical module；2, plane mirror；3, convex aspheric surface speculum；4, perspective plane；5, optics group
Part optical axis.
【Specific implementation mode】
It elaborates below in conjunction with the accompanying drawings to embodiments of the present invention.
As shown in Figure 1, a kind of ultrashort out-of-focus projection's optical system of multiple reflection formula, refraction type light is set gradually according to projecting light path
Learn component 1, plane mirror 2, convex aspheric surface speculum 3 and perspective plane 4；Plane mirror 2 is arranged in refractive optical group
The top of part 1 simultaneously transfers to light path, convex aspheric surface speculum 3 is placed on 2 reflected light path of plane mirror, convex surface is non-
Perspective plane 4 is set on 3 reflected light path of spherical reflector.Distortion using convex reflecting mirror recoverable whole system and astigmatism, make
Projected picture is clear, and after two secondary reflections, optical system perspective plane 4 is parallel with the optical axis 5 of optical module, and then shortens whole
A system improves projection ratio, provided of course that also can reach same effect after even reflects at a distance from perspective plane.
Perspective plane 4 is parallel with the optical axis 5 of refractive optical element 1.
Distance of the convex aspheric surface speculum 3 apart from perspective plane is less than 30CM.
Refractive optical element 1 is telecentricity framework or non-telecentricity framework.
The surface shape of convex aspheric surface speculum 3 meets following equation：
In formula, parameter c is the curvature corresponding to radius, its unit is identical with length of lens unit for radial coordinate by y,
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, 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；a1To a8It indicates respectively each
Even aspheric surface coefficient corresponding to radial coordinate.
Claims (5)
1. a kind of ultrashort out-of-focus projection's optical system of multiple reflection formula, it is characterised in that set gradually refractive optical according to projecting light path
Component (1), plane mirror (2), convex aspheric surface speculum (3) and perspective plane (4)；Plane mirror (2) setting is reflecting
The top of formula optical module (1) simultaneously transfers to light path, and it is anti-that convex aspheric surface is placed on plane mirror (2) reflected light path
Mirror (3) is penetrated, perspective plane (4) are set on convex aspheric surface speculum (3) reflected light path.
2. the ultrashort out-of-focus projection's optical system of a kind of multiple reflection formula according to claim 1, it is characterised in that perspective plane (4) with
The optical axis (5) of refractive optical element (1) is parallel.
3. the ultrashort out-of-focus projection's optical system of a kind of multiple reflection formula according to claim 1, it is characterised in that the convex surface is non-
Distance of the spherical reflector (3) apart from perspective plane (4) is less than 30C.
4. the ultrashort out-of-focus projection's optical system of a kind of multiple reflection formula according to claim 1, it is characterised in that the refraction type
Optical module (1) is telecentricity framework or non-telecentricity framework.
5. the ultrashort out-of-focus projection's optical system of a kind of multiple reflection formula according to claim 1, it is characterised in that the convex surface
The surface shape of non-spherical reflector (3) meets following equation：
In formula, parameter (c) is the curvature corresponding to radius, and (y) for radial coordinate, its unit is identical with length of lens unit,
(k) it is circular cone whose conic coefficient；When (k) coefficient is less than -1, the face shape curves of lens is hyperbola, when (k) coefficient is equal to -
When 1, the face shape curve of lens is parabola；When (k) coefficient is between -1 to 0, the face shape curve of lens is ellipse, when
(k) when coefficient is equal to 0, the face shape curve of lens is circle, and when (k) coefficient is more than 0, the face shape curve of lens is oblateness；
(a1) to (a8) even aspheric surface coefficient corresponding to each radial coordinate is indicated respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810252127.0A CN108303783A (en) | 2018-03-26 | 2018-03-26 | A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810252127.0A CN108303783A (en) | 2018-03-26 | 2018-03-26 | A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula |
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| Publication Number | Publication Date |
|---|---|
| CN108303783A true CN108303783A (en) | 2018-07-20 |
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ID=62847845
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810252127.0A Pending CN108303783A (en) | 2018-03-26 | 2018-03-26 | A kind of ultrashort out-of-focus projection's optical system of multiple reflection formula |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445237A (en) * | 2019-01-10 | 2019-03-08 | 上海白泽网络科技有限公司 | Ultrashort coke optical projection system and electronic equipment |
| CN109491060A (en) * | 2018-12-17 | 2019-03-19 | 浙江大学 | A kind of ultrashort focus objective lens for desktop projection |
| CN113960870A (en) * | 2021-09-22 | 2022-01-21 | 沂普光电(天津)有限公司 | Reflective ultrashort-focus optical module |
Citations (4)
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| CN1380989A (en) * | 2000-05-10 | 2002-11-20 | 三菱电机株式会社 | Image display device and alignment adjusting method |
| CN105182511A (en) * | 2015-07-22 | 2015-12-23 | 秦皇岛视听机械研究所 | Eight-group ten-sheet refraction and reflection type ultra-low projection ratio projection lens foundation structure |
| CN106527028A (en) * | 2016-11-17 | 2017-03-22 | 河南宏昌科技有限公司 | Vertical ultra-short focus projector |
| CN208013520U (en) * | 2018-03-26 | 2018-10-26 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
-
2018
- 2018-03-26 CN CN201810252127.0A patent/CN108303783A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1380989A (en) * | 2000-05-10 | 2002-11-20 | 三菱电机株式会社 | Image display device and alignment adjusting method |
| CN105182511A (en) * | 2015-07-22 | 2015-12-23 | 秦皇岛视听机械研究所 | Eight-group ten-sheet refraction and reflection type ultra-low projection ratio projection lens foundation structure |
| CN106527028A (en) * | 2016-11-17 | 2017-03-22 | 河南宏昌科技有限公司 | Vertical ultra-short focus projector |
| CN208013520U (en) * | 2018-03-26 | 2018-10-26 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491060A (en) * | 2018-12-17 | 2019-03-19 | 浙江大学 | A kind of ultrashort focus objective lens for desktop projection |
| CN109445237A (en) * | 2019-01-10 | 2019-03-08 | 上海白泽网络科技有限公司 | Ultrashort coke optical projection system and electronic equipment |
| CN113960870A (en) * | 2021-09-22 | 2022-01-21 | 沂普光电(天津)有限公司 | Reflective ultrashort-focus optical module |
| CN113960870B (en) * | 2021-09-22 | 2022-03-01 | 沂普光电(天津)有限公司 | Reflective ultrashort-focus optical module |
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