CN107490846A - A kind of projection lens - Google Patents
A kind of projection lens Download PDFInfo
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- CN107490846A CN107490846A CN201710840184.6A CN201710840184A CN107490846A CN 107490846 A CN107490846 A CN 107490846A CN 201710840184 A CN201710840184 A CN 201710840184A CN 107490846 A CN107490846 A CN 107490846A
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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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- 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
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Abstract
The present embodiments relate to optical image technology, discloses a kind of projection lens.Projection lens includes：Display chip, for modulating the light beam come from illuminator, to show micro- image；Prism, the light for illuminator to be come out are totally reflected to the display chip；The refractor group, for balance micro- image through the refractor group into image aberration；Speculum group, for light path of transferring, and correct the refractor group into image residual aberration.The technical scheme of the embodiment of the present invention, realize on the premise of projection ratio is reduced, ensure machining accuracy, control the cost of processing.
Description
Technical field
The present embodiments relate to optical image technology, more particularly to a kind of projection lens.
Background technology
With the fast development of shadow casting technique, ultrashort out-of-focus projection's technology can project the excellent of big picture by it in short distance
Gesture, allow small conference room to have the possibility realized, and greatly paid close attention to by each side.
Initially realize that the design method of ultrashort out-of-focus projection's camera lens designs for refraction type, camera lens is by spherical lens or aspherical
Microscope group into.With the increase of angle of incidence of light, the camera lens of this refraction structure is difficult the distortion for avoiding image planes, aberration, coma, because
This is difficult to continue to reduce projection ratio in the case where ensureing as matter.
The structure of the design principle much based on refraction plus transmittance structure existing at present is suggested, but is reducing projection ratio
Meanwhile these structures can not control the aberration of imaging well, spherical aberration, the optical parametric such as coma and distortion, can not ensure image planes
Brightness and the depth of field.And the balsaming lens that uses of structure of the prior art or non-spherical lens be at two or more,
Therefore it is difficult to ensure that the precision of processing, can also increase the cost of processing.
The content of the invention
The embodiment of the present invention provides a kind of projection lens, to realize on the premise of projection ratio is reduced, ensures machining accuracy,
Control the cost of processing.
The embodiments of the invention provide a kind of projection lens, including：
Display chip, for modulating the light beam come from illuminator, to show micro- image；
Prism, the light for illuminator to be come out are totally reflected to the display chip；
The refractor group, for balance micro- image through the refractor group into image aberration；
Speculum group, for light path of transferring, and correct the refractor group into image residual aberration.
Further, the speculum group includes non-spherical reflector and spherical reflector；
Wherein, the refractor group and the non-spherical reflector have same primary optical axis；
The primary optical axis of the primary optical axis of the spherical reflector and the non-spherical reflector is on different horizontal planes；
The non-spherical reflector, for light path of transferring, and correct the refractor group into image residual aberration；
The spherical reflector, the light beam reflected for the non-spherical reflector of transferring, to project on screen.
Further, micro- image that the refractor group is balanced through the refractor group into image picture
Difference includes：Spherical aberration, coma, astigmatism, the curvature of field and aberration.
Further, the refractor group is included along tactic first lens group of light path, aperture diaphragm and the
Two lens groups；
Wherein, first lens group, the aperture diaphragm and second lens group have same primary optical axis.
Further, it is first lens group includes being arranged in order along light path the first lens, the second lens, the 3rd saturating
Mirror, the 4th lens and the 5th lens；
First lens are a concave-convex lens, and second lens are a biconvex lens, and the 3rd lens are a pair of
Convex lens, the 4th lens are a biconcave lens, and the 5th lens are a biconvex lens；
Wherein, the 4th lens and the 5th lens glue are combined into an entirety.
Further, it is second lens group includes being arranged in order along light path the 6th lens, the 7th lens, the 8th saturating
Mirror, the 9th lens, the tenth lens, the 11st lens, the 12nd lens, the 13rd lens, the 14th lens and the 15th lens；
6th lens are a biconvex lens, and the 7th lens are a concave-convex lens, and the 8th lens are one recessed
Convex lens, the 9th lens are a biconcave lens, and the tenth lens are a biconvex lens, and 11 lens are one concavo-convex
Lens, 12 lens are a meniscus, and the 13rd lens are a biconvex lens, and the 14th lens are a pair of
Convex lens, the 15th lens are a concavo-convex lens；
Wherein, the 12nd lens are used for the effect for adjusting zoom, to coordinate the projection lens in preset range
Interior movement, the picture for making to be projected on screen are clear.
Further, the display chip is aobvious for data micro-mirror device (Digital Micromirror Device, DMD)
Show chip；Wherein, the resolution ratio of the DMD display chips is 4k, and pixel size is 5.4 microns.
Further, the DMD display chips are biased to 5.59 millimeters.
Further, the aspherical face type of the non-spherical reflector is by formula：
Characterize, wherein, z is rise, and c is the curvature of curved surface apex, and r is curved surface point coordinates perpendicular to optical axial plane
Projection and the distance of optical axis, k are circular cone coefficient, a1、a2、a3、a4、a5、a6、a7And a8Represent coefficient corresponding to even order terms.
Further, the 15th lens are non-spherical lens, and the aspherical face type of the 15th lens is by formula：
Characterize, wherein, z is rise, and c is the curvature of curved surface apex, and r is curved surface point coordinates perpendicular to optical axial plane
Projection and the distance of optical axis, k are circular cone coefficient, a1、a2、a3、a4、a5、a6、a7And a8Represent coefficient corresponding to even order terms.
The present invention solves to install using caused by multi-disc aspherical mirror by setting a non-spherical reflector aberration correction
Required precision is high, the problem of high processing costs, realizes and ensures machining accuracy, control the effect of the cost of processing.
Brief description of the drawings
Fig. 1 is a kind of structural representation of projection lens in the embodiment of the present invention one；
Fig. 2 is a kind of structural representation of projection lens in the embodiment of the present invention two；
Fig. 3 is a kind of schematic diagram of projection lens operation principle in the embodiment of the present invention two.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Embodiment one
Fig. 1 is a kind of structural representation for projection lens that the embodiment of the present invention one provides, and the present embodiment is applicable to meeting
The indoor scene such as room is discussed, projects the situation of big picture in short distance, the projection lens, including：
Display chip 0000, for modulating the light beam come from illuminator, to show micro- image；Wherein, display chip
0000 is DMD display chips；Example, resolution ratio can be selected as 4k, pixel size is 5.4 microns of DMD display chips.Can
Choosing, DMD display chips are biased to 5.59 millimeters.
Prism 1000, display chip 0000 is totally reflected to for the light for illuminator to be come out；
Refractor group 2000, for balance micro- image through refractor group 2000 into image aberration；Wherein, reflect
Lens group 2000 is the primary clustering of projection lens, and the process of screen is imaged onto in the micro- image for showing display chip 0000
In, balance chart aberration as existing for.Example, micro- image that refractor group 2000 is balanced through the institute of refractor group 2000 into
The aberration of image includes：Spherical aberration, coma, astigmatism, the curvature of field and aberration.
Speculum group 3000, for light path of transferring, and correction of refractive lens group 2000 into image residual aberration.Its
In, balance such as spherical aberration, coma, astigmatism, the curvature of field and aberration in refractor group 2000, after these aberrations, can also remain
Aberration, the aberration of residual mainly distort.Speculum group 3000 can include non-spherical reflector, so as to play enlarged drawing
Picture, and the effect of turnover light path, also, the distortion aberration that also further correction remains.
The present invention solves to install using caused by multi-disc aspherical mirror by setting a non-spherical reflector aberration correction
Required precision is high, the problem of high processing costs, realizes and ensures machining accuracy, control the effect of the cost of processing.
Embodiment two
The technical scheme of the present embodiment further refines on the basis of the technical scheme of above-described embodiment, optionally, such as
Shown in Fig. 2, refractor group 2000 is included along tactic first lens group 2100 of light path, aperture diaphragm 2200 and second
Lens group 2300.
Wherein, the first lens group 2100, the lens group 2300 of aperture diaphragm 2200 and second have same primary optical axis.
As shown in Fig. 2 the first lens group 2100 includes the first lens 2001, the second lens being arranged in order along light path
2002nd, the 3rd lens 2003, the 4th lens 2004 and the 5th lens 2005；
First lens 2001 are a concave-convex lens, and the second lens 2002 are a biconvex lens, and the 3rd lens 2003 are a pair of
Convex lens, the 4th lens 2004 are a biconcave lens, and the 5th lens 2005 are a biconvex lens；
Wherein, the 4th lens 2004 and the gluing of the 5th lens 2005 are an entirety.
Optionally, as shown in Fig. 2 the second lens group 2300 includes the 6th lens the 2006, the 7th being arranged in order along light path
Lens 2007, the 8th lens 2008, the 9th lens 2009, the tenth lens 2010, the 11st lens 2011, the 12nd lens
2012nd, the 13rd lens 2013, the 14th lens 2014 and the 15th lens 2015.
6th lens 2006 are a biconvex lens, and the 7th lens 2007 are a concave-convex lens, and the 8th lens 2008 are one recessed
Convex lens, the 9th lens 2009 are a biconcave lens, and the tenth lens 2010 are a biconvex lens, and 11 lens 2011 are one concavo-convex
Lens, 12 lens 2012 are a meniscus, and the 13rd lens 2013 are a biconvex lens, and the 14th lens 2014 are a pair of
Convex lens, the 15th lens 2015 are a concavo-convex lens；
Wherein, the 12nd lens 2012 are used to adjust the effect of zoom, to coordinate projection lens within a preset range
Mobile, the picture for making to be projected on screen is clear.
Optionally, as shown in Fig. 2 speculum group includes non-spherical reflector 3001 and spherical reflector 3002.
Wherein, refractor group 2000 and non-spherical reflector 3001 have same primary optical axis.
The primary optical axis of spherical reflector 3002 and the primary optical axis of non-spherical reflector 3001 are on different horizontal planes.
Non-spherical reflector 3001, for light path of transferring, and correction of refractive lens group 2000 into image residual aberration；
Spherical reflector 3002, the light beam reflected for non-spherical reflector 3001 of transferring, to project on screen.
Optionally, the aspherical face type of non-spherical reflector 3001 is by formula：
Characterize, wherein, z is rise, and c is the curvature of curved surface apex, and r is curved surface point coordinates perpendicular to optical axial plane
Projection and the distance of optical axis, k are circular cone coefficient, a1、a2、a3、a4、a5、a6、a7And a8Represent coefficient corresponding to even order terms.
In order to reach relatively low projection than and further improve the remaining curvature of field and distortion aberration, obtained by mathematical algorithm
Several primary face types of non-spherical reflector, what selection was wherein easy to process continues to optimize, and it is anti-to finally give the even aspheric surface
Penetrate mirror 3001.Although the aspherical exponent number of this concave surface even aspheric surface speculum 3001 reaches 20 ranks, its face type is preferable,
The material of making is aluminium, not high to the requirement that processes and assemble.
Optionally, the 15th lens 2015 are non-spherical lens, and the aspherical face type of the 15th lens 2015 is by formula：
Characterize, wherein, z is rise, and c is the curvature of curved surface apex, and r is curved surface point coordinates perpendicular to optical axial plane
Projection and the distance of optical axis, k are circular cone coefficient, a1、a2、a3、a4、a5、a6、a7And a8Represent coefficient corresponding to even order terms.It is optional
, the material of the 15th lens 2015 is lucite PMMAO.
According to optical imaging concept, optimized by calculating with follow-up, and cost consideration and assembly analysis, it is determined that refraction is saturating
Lens face type, spacing and the material of microscope group 2000.In order to control the aberration of imaging and spherical aberration, the process and assemble of whole system is reduced
Cost, and ensure final image quality, the refractor group 2000 has used a piece of balsaming lens.Prism 1000, from
The material of the lens 2014 of one lens 2001 to the 14th is using conventional environment-friendly type glass.
Ultrashort out-of-focus projection's lens system operation principle provided in an embodiment of the present invention is as shown in figure 3, incident ray passes through rib
Microscope group 1000, come refractor group 2000, the aberration of whole imaging system is greatly lowered, such as spherical aberration, coma, as
The aberrations such as scattered, the curvature of field, aberration, but distortion is not better to improve.Then light passes through non-spherical reflector 3001, reflection
By spherical reflector 3002, reflex on screen 4000 and be imaged again, the picture projected.Wherein, non-spherical reflector
3001 main effects are to correct the distortion aberration that refractor group 2000 left behind.Clearly shadowgraph can so be obtained
Face.
The performance parameter that ultrashort out-of-focus projection's lens system of the embodiment of the present invention can reach is：Projection is put than being 0.155
Big 167 times of multiplying power, F numbers 2.0, rear burnt 27.55mm, meet the high quality imaging under 4k resolution ratio, and vertical TV distortion (TV
Distortion) it is less than 0.1%, horizontal TV distortion is less than 0.2%.Wherein, projection than be exactly projector distance with picture width it
Than in identical operating distance, projecting than smaller, the picture of projection is bigger.0.155 projection is significantly better than similar than
Product.F numbers determine the difficulty of illuminance of image plane and design, and F numbers are smaller, represent that capacity usage ratio is higher, and aberration can be difficult control.
This ultrashort out-of-focus projection's lens system can guarantee that especially small vertical distortion and horizontal distortion in different projections than under, and relatively low
Spherical aberration, astigmatism, coma, aberration, the curvature of field, be the system superior part.
Ultrashort out-of-focus projection's lens system that the present embodiment provides is projected than relatively low, moreover it is possible to ensures 4k resolution ratio.Except using
The balsaming lens of a pair of spherical structures, beyond non-spherical reflector, it is reasonable that whole system is adjusted rear Tolerance assignment,
Maximally reduce the error that the assembling of mechanical structure is brought, considerably reduce difficulty of processing, be adapted to large-scale production.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
- A kind of 1. projection lens, it is characterised in that including：Display chip, for modulating the light beam come from illuminator, to show micro- image；Prism, the light for illuminator to be come out are totally reflected to the display chip；The refractor group, for balance micro- image through the refractor group into image aberration；Speculum group, for light path of transferring, and correct the refractor group into image residual aberration.
- 2. projection lens according to claim 1, it is characterised in that the speculum group includes non-spherical reflector and ball Face speculum；Wherein, the refractor group and the non-spherical reflector have same primary optical axis；The primary optical axis of the primary optical axis of the spherical reflector and the non-spherical reflector is on different horizontal planes；The non-spherical reflector, for light path of transferring, and correct the refractor group into image residual aberration；The spherical reflector, the light beam reflected for the non-spherical reflector of transferring, to project on screen.
- 3. projection lens according to claim 1, it is characterised in that micro- image that the refractor group is balanced Through the refractor group include into the aberration of image：Spherical aberration, coma, astigmatism, the curvature of field and aberration.
- 4. projection lens according to claim 1, it is characterised in that the refractor group includes arranging along light path order The first lens group, aperture diaphragm and the second lens group of row；Wherein, first lens group, the aperture diaphragm and second lens group have same primary optical axis.
- 5. projection lens according to claim 4, it is characterised in that：First lens group includes the first lens, the second lens, the 3rd lens, the 4th lens and the being arranged in order along light path Five lens；First lens are a concave-convex lens, and second lens are a biconvex lens, and the 3rd lens are a lenticular Mirror, the 4th lens are a biconcave lens, and the 5th lens are a biconvex lens；Wherein, the 4th lens and the 5th lens glue are combined into an entirety.
- 6. the projection lens according to claim 4 or 5, it is characterised in that：The 6th lens that second lens group includes being arranged in order along light path, the 7th lens, the 8th lens, the 9th lens, the Ten lens, the 11st lens, the 12nd lens, the 13rd lens, the 14th lens and the 15th lens；6th lens are a biconvex lens, and the 7th lens are a concave-convex lens, and the 8th lens are one concavo-convex saturating Mirror, the 9th lens are a biconcave lens, and the tenth lens are a biconvex lens, and 11 lens are one concavo-convex saturating Mirror, 12 lens are a meniscus, and the 13rd lens are a biconvex lens, and the 14th lens are a biconvex Lens, the 15th lens are a concavo-convex lens；Wherein, the 12nd lens are used to adjust the effect of zoom, to coordinate the projection lens within a preset range Mobile, the picture for making to be projected on screen is clear.
- 7. projection lens according to claim 1, it is characterised in that the display chip is that data micro-mirror device DMD shows Show chip；Wherein, the resolution ratio of the DMD display chips is 4k, and pixel size is 5.4 microns.
- 8. projection lens according to claim 7, it is characterised in that the DMD display chips are biased to 5.59 millimeters.
- 9. projection lens according to claim 2, it is characterised in that the aspherical face type of the non-spherical reflector is by public affairs Formula：<mrow> <mi>z</mi> <mo>=</mo> <mfrac> <mrow> <msup> <mi>cr</mi> <mn>2</mn> </msup> </mrow> <mrow> <mn>1</mn> <mo>+</mo> <msqrt> <mrow> <mn>1</mn> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <mi>k</mi> <mo>)</mo> </mrow> <msup> <mi>c</mi> <mn>2</mn> </msup> <msup> <mi>r</mi> <mn>2</mn> </msup> </mrow> </msqrt> </mrow> </mfrac> <mo>+</mo> <msub> <mi>a</mi> <mn>1</mn> </msub> <msup> <mi>r</mi> <mn>2</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>2</mn> </msub> <msup> <mi>r</mi> <mn>4</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>3</mn> </msub> <msup> <mi>r</mi> <mn>6</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>4</mn> </msub> <msup> <mi>r</mi> <mn>8</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>5</mn> </msub> <msup> <mi>r</mi> <mn>10</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>6</mn> </msub> <msup> <mi>r</mi> <mn>12</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>7</mn> </msub> <msup> <mi>r</mi> <mn>14</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>8</mn> </msub> <msup> <mi>r</mi> <mn>16</mn> </msup> </mrow> 1Characterize, wherein, z is rise, and c is the curvature of curved surface apex, and r is curved surface point coordinates in the projection perpendicular to optical axial plane With the distance of optical axis, k is circular cone coefficient, a1、a2、a3、a4、a5、a6、a7And a8Represent coefficient corresponding to even order terms.
- 10. projection lens according to claim 6, it is characterised in that the 15th lens are non-spherical lens, described The aspherical face type of 15th lens is by formula：<mrow> <mi>z</mi> <mo>=</mo> <mfrac> <mrow> <msup> <mi>cr</mi> <mn>2</mn> </msup> </mrow> <mrow> <mn>1</mn> <mo>+</mo> <msqrt> <mrow> <mn>1</mn> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <mi>k</mi> <mo>)</mo> </mrow> <msup> <mi>c</mi> <mn>2</mn> </msup> <msup> <mi>r</mi> <mn>2</mn> </msup> </mrow> </msqrt> </mrow> </mfrac> <mo>+</mo> <msub> <mi>a</mi> <mn>1</mn> </msub> <msup> <mi>r</mi> <mn>2</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>2</mn> </msub> <msup> <mi>r</mi> <mn>4</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>3</mn> </msub> <msup> <mi>r</mi> <mn>6</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>4</mn> </msub> <msup> <mi>r</mi> <mn>8</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>5</mn> </msub> <msup> <mi>r</mi> <mn>10</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>6</mn> </msub> <msup> <mi>r</mi> <mn>12</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>7</mn> </msub> <msup> <mi>r</mi> <mn>14</mn> </msup> <mo>+</mo> <msub> <mi>a</mi> <mn>8</mn> </msub> <msup> <mi>r</mi> <mn>16</mn> </msup> </mrow>Characterize, wherein, z is rise, and c is the curvature of curved surface apex, and r is curved surface point coordinates in the projection perpendicular to optical axial plane With the distance of optical axis, k is circular cone coefficient, a1、a2、a3、a4、a5、a6、a7And a8Represent coefficient corresponding to even order terms.
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| CN108305231A (en) * | 2018-02-09 | 2018-07-20 | 西安电子科技大学 | A kind of lens distortion antidote in mask-free photolithography technology |
| CN108305231B (en) * | 2018-02-09 | 2021-08-27 | 西安电子科技大学 | Lens distortion correction method in maskless photoetching technology |
| CN112180660A (en) * | 2019-07-04 | 2021-01-05 | 无锡视美乐激光显示科技有限公司 | DLP (digital light processing) illuminating system and projecting device using aspheric reflector |
| CN112269298A (en) * | 2020-11-24 | 2021-01-26 | 四川长虹电器股份有限公司 | Curved surface projection optical system |
| CN113504633A (en) * | 2021-06-29 | 2021-10-15 | 青岛海信激光显示股份有限公司 | Projection system |
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| CN107490846B (en) | 2020-04-03 |
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