CN207457592U - A kind of ultrashort out-of-focus projection's camera lens - Google Patents

A kind of ultrashort out-of-focus projection's camera lens Download PDF

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CN207457592U
CN207457592U CN201721651193.2U CN201721651193U CN207457592U CN 207457592 U CN207457592 U CN 207457592U CN 201721651193 U CN201721651193 U CN 201721651193U CN 207457592 U CN207457592 U CN 207457592U
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lens
msup
refractor
light
projection
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杨军
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Shanghai Li Xin Optics Science And Technology Ltd
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Shanghai Li Xin Optics Science And Technology Ltd
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Abstract

The utility model discloses a kind of ultrashort out-of-focus projection's camera lenses.Ultrashort out-of-focus projection's camera lens includes:Display chip, for showing object plane to be projected;The refractor group of display chip light emission side is arranged at, refractor group includes multiple lens, and each lens are spherical lens, for balancing the aberration that projection object plane light passes through refractor group and formed;Speculum deviates from the one side of display chip, the curvature of field and distortion caused by for reducing refractor group, and reflection light positioned at refractor group, forms the projection image planes of amplification.The technical solution of the utility model is coordinated by multiple spherical lenses, and balance projection object plane light passes through the aberration that refractor group is formed;The curvature of field and distortion, and reflection light are reduced by speculum, the projection image planes of amplification is formed, realizes short distance and the big image of high-quality projection.And refractor group all selects spherical lens, without non-spherical lens and cemented doublet, is conducive to processing and volume production.

Description

A kind of ultrashort out-of-focus projection's camera lens
Technical field
The utility model embodiment is related to projection optical system technology more particularly to a kind of ultrashort out-of-focus projection's camera lens.
Background technology
In recent years, ultrashort out-of-focus projection's camera lens projects more and more concerned in the market in short focus.On the one hand, ultrashort out-of-focus projection's mirror The relatively common projection lens of head substantially reduces projector distance, and the picture of big visual field can be projected out in very short projector distance Face improves space availability ratio, moreover it is possible to avoid blocking for the shadow or other objects;On the other hand, ultrashort out-of-focus projection's camera lens is set Meter is to the more demanding of the optimization of resolution ratio, luminous intensity and various aberrations etc..
The camera lens of ultrashort out-of-focus projection's instrument currently on the market includes three kinds of modes:Reflective, refraction type is hybrid.Due to The main element of projection lens imaging is refractor, and refractor can generate various aberrations in imaging process.In order to rectify Positive aberration can generally include at least a piece of non-spherical lens and cemented doublet in existing design, this results in processing, assemble and answer It is miscellaneous, the problems such as precision is unstable, and may result in glue local melting under balsaming lens high temperature, influence drop shadow effect.
Utility model content
The utility model provides a kind of ultrashort out-of-focus projection's camera lens, to realize the mesh of short distance and the big image of high-quality projection 's.
The utility model embodiment provides a kind of ultrashort out-of-focus projection's camera lens, including:
Display chip, for showing object plane to be projected;
The refractor group of the display chip light emission side is arranged at, the refractor group includes multiple lens, each institute It is spherical lens to state lens, for balancing the aberration that the projection object plane light passes through the refractor group and formed;
Speculum deviates from the one side of the display chip positioned at the refractor group, for reducing the refractor The curvature of field caused by group and distortion, and reflection light form the projection image planes of amplification.
Optionally, refracting prisms and lighting source are further included;The refracting prisms are located at the display chip and the folding It penetrates between lens group, the refracting prisms include the first incidence surface, the second incidence surface and light-emitting surface, first incidence surface and institute It states the second incidence surface and the light-emitting surface intersects;First incidence surface of the light-emitting surface of the lighting source and the refracting prisms It is oppositely arranged, the light emission side of the display chip and second incidence surface of the refracting prisms are oppositely arranged, the refraction The incidence surface of lens group and the light-emitting surface of the refracting prisms are oppositely arranged, and the refracting prisms are used to reflect the illumination The illuminating bundle that light source is sent is to the display chip.
Optionally, the display chip is Digital Micromirror Device DMD.
Optionally, the refractor group includes 15 spherical lenses, 15 spherical lens co-axial alignments, bag Include the first lens set gradually along light path, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th Lens, the 8th lens, the 9th lens, the tenth lens, the 11st lens, the 12nd lens, the 13rd lens, the 14th lens and 15th lens;
First lens are a positive meniscus lens, and second lens are a positive meniscus lens, and the 3rd lens are One positive meniscus lens, the 4th lens be a diverging meniscus lens, the 5th lens be a biconvex lens, the 6th lens For a diverging meniscus lens, the 7th lens are a biconvex lens, and the 8th lens are a diverging meniscus lens, and the described 9th thoroughly Mirror is a positive meniscus lens, and the tenth lens are a positive meniscus lens, and the 11st lens are a diverging meniscus lens, described 12nd lens are a positive meniscus lens, and the 13rd lens are a biconcave lens, and the 14th lens are a positive bent moon Lens, the 15th lens are a diverging meniscus lens.
Optionally, further include aperture diaphragm, the aperture diaphragm be arranged at the 4th lens and the 5th lens it Between, for controlling the brightness of the depth of field, the scope of imaging object space and picture.
Optionally, the refractor group includes 15 spherical lenses, 15 spherical lens co-axial alignments, bag Include the first lens set gradually along light path, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th Lens, the 8th lens, the 9th lens, the tenth lens, the 11st lens, the 12nd lens, the 13rd lens, the 14th lens and 15th lens;
First lens are a biconvex lens, and second lens are a biconvex lens, and the 3rd lens are flat for one Convex lens, the 4th lens are a biconcave lens, and the 5th lens are a planoconvex spotlight, and the 6th lens are a biconvex Lens, the 7th lens are a biconcave lens, and the 8th lens are a biconvex lens, and the 9th lens are saturating for a concave-concave Mirror, the tenth lens are a biconvex lens, and the 11st lens are a diverging meniscus lens, and the 12nd lens is one just Meniscus lens, the 13rd lens are a biconvex lens, and the 14th lens are a positive meniscus lens, and the described 15th thoroughly Mirror is a biconcave lens.
Optionally, further include aperture diaphragm, the aperture diaphragm be arranged at the 5th lens and the 6th lens it Between, for controlling the brightness of the depth of field, the scope of imaging object space and picture.
Optionally, the speculum is non-spherical reflector.
Optionally, the non-spherical reflector is concave surface, and its face type is by formula:
It determines, 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 the corresponding coefficient of even order terms.
Optionally, the refractor group has same primary optical axis with the speculum.
The utility model embodiment provides a kind of ultrashort out-of-focus projection's camera lens, ultrashort out-of-focus projection's camera lens include display chip, It is arranged at the refractor group of display chip light emission side and deviates from the speculum of display chip one side positioned at refractor group;It is logical It crosses display chip and shows object plane to be projected, the light incidence refractor group of object plane to be projected;Refractor group is by multiple spherical surfaces Lens are combined into, and light can cause positive aberration and negative aberration by different spherical lenses, pass through the cooperation of multiple spherical lenses Effect can balance projection object plane light and pass through the aberration that refractor group is formed;Light by the outgoing of refractor group is also There are the curvature of field and distortion, speculum forms the projection image planes of amplification, realizes short for reducing the curvature of field and distortion, and reflection light Distance and the big image of high-quality projection.The technical solution refractor group of the utility model embodiment all selects spherical lens, Without non-spherical lens and cemented doublet, be conducive to processing and volume production.
Description of the drawings
Fig. 1 is ultrashort out-of-focus projection's lens construction schematic diagram that the utility model embodiment one provides;
Fig. 2 is the structure diagram for ultrashort out-of-focus projection's camera lens that the utility model embodiment two provides;
Fig. 3 is the imaging optical path principle schematic for ultrashort out-of-focus projection's camera lens that the utility model embodiment two provides;
Fig. 4 is the modulation transfer function curve signal of a certain each visual field of display picture of the utility model embodiment two Figure;
Fig. 5 is the structure diagram for ultrashort out-of-focus projection's camera lens that the utility model embodiment three provides;
Fig. 6 is the imaging optical path principle schematic for ultrashort out-of-focus projection's camera lens that the utility model embodiment three provides;
Fig. 7 is the modulation transfer function curve signal of a certain each visual field of display picture of the utility model embodiment three Figure.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein Described specific embodiment is used only for explaining the utility model rather than the restriction to the utility model.It further needs exist for It is bright, part relevant with the utility model rather than entire infrastructure are illustrated only for ease of description, in attached drawing, wherein from beginning Same or similar element is represented to same or similar label eventually or there is same or like element.Specific embodiment Described in upper and lower, left and right etc. be for only for ease of and understand carried out description, be not considered as the restriction in specific orientation.
Embodiment one
Fig. 1 is ultrashort out-of-focus projection's lens construction schematic diagram that the utility model embodiment one provides.Ultrashort out-of-focus projection's mirror Head includes:Display chip 100, for showing object plane to be projected;The refractor group 200 of 100 light emission side of display chip is arranged at, Refractor group 200 includes multiple lens, and each lens are spherical lens, for balancing projection object plane light by refractor The aberration of 200 groups of formation;Speculum 300 deviates from the one side of display chip 100 positioned at refractor group 200, is reflected for reducing The curvature of field and distortion caused by lens group 200, and reflection light form the projection image planes of amplification.
It is understood that aberration is in actual optical system, paraxial rays is deviateed caused by far-off axle light rays The phenomenon that ideal image, aberration mainly have spherical aberration, coma, aberration, astigmatism, the curvature of field, distortion etc..For example, positive lens is to light Convergence effect is done up, negative spherical aberration can be generated, negative lens plays disperse function to light beam, can generate positive spherical aberration, saturating using multiple spherical surfaces Mirror cooperates, can be with active balance spherical aberration, coma, aberration, astigmatism etc., but can leave the curvature of field do not corrected and distortion.Light By inciding into speculum 300 after refractor group 200, speculum 300 can increase light path, reduce the body of projection lens Product, and 300 face type of speculum passes through digital simulation, is emitted after reducing the curvature of field and distortion, such as reception screen is imaged on, reach clear Clear, amplification projection image planes.
The utility model embodiment provides a kind of ultrashort out-of-focus projection's camera lens, ultrashort out-of-focus projection's camera lens include display chip, It is arranged at the refractor group of display chip light emission side and deviates from the speculum of display chip one side positioned at refractor group;It is logical It crosses display chip and shows object plane to be projected, the light incidence refractor group of object plane to be projected;Refractor group is by multiple spherical surfaces Lens are combined into, and light can cause positive aberration and negative aberration by different spherical lenses, pass through the cooperation of multiple spherical lenses Effect can balance projection object plane light and pass through the aberration that refractor group is formed;Light by the outgoing of refractor group is also There are the curvature of field and distortion, speculum forms the projection image planes of amplification, realizes short for reducing the curvature of field and distortion, and reflection light Distance and the big image of high-quality projection.The technical solution refractor group of the utility model embodiment all selects spherical lens, Without non-spherical lens and cemented doublet, be conducive to processing and volume production.
Optionally, ultrashort out-of-focus projection's system that the utility model embodiment provides further includes refracting prisms 400 and illumination light Source 500;For refracting prisms 400 between display chip 100 and refractor group 200, refracting prisms include the first incidence surface, the Two incidence surfaces and light-emitting surface, the first incidence surface intersect with the second incidence surface and light-emitting surface;The light-emitting surface and folding of lighting source 500 The first incidence surface for penetrating prism 400 is oppositely arranged, the light emission side of display chip 100 and the second incidence surface phase of refracting prisms 400 To setting, the light-emitting surface of the incidence surface and refracting prisms 400 of refractor group 200 is oppositely arranged, and refracting prisms 400 are used to reflect The illuminating bundle that lighting source 500 is sent is to display chip 100.
It is understood that by taking Fig. 1 as an example, the illuminating bundle that lighting source 500 is sent enters from the first of refracting prisms 400 Smooth surface (being 400 upper surface of refracting prisms in Fig. 1 views) enters to inject refracting prisms 400, by 400 internal refraction face of refracting prisms Effect, be emitted to through the second incidence surface (400 left surface of refracting prisms in Fig. 1 views) on display chip 100, display chip 100, by modulated illumination, form object plane outgoing to be projected, refracting prisms 400 are incided by the second incidence surface, through superrefraction Refractor group 200 is incided into after 400 light-emitting surface of prism (400 right surface of refracting prisms in Fig. 1 views).
Optionally, display chip 100 is Digital Micromirror Device (Digital Micro-mirror Device, DMD).
Digital Micromirror Device, for modulated illumination, to show micro- image, the object plane as projection lens.It such as can To be the Digital Micromirror Device of 4096 × 2160 resolution ratio, to meet the requirement of high quality imaging.
Optionally, speculum 300 is non-spherical reflector.Non-spherical reflector is concave surface, and its face type is by formula:
It determines, 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 the corresponding coefficient of even order terms.
By the curved surface face type for the speculum 300 that above formula designs, light can be effectively reduced by refractor group The remaining curvature of field and distortion after 200 make imaging keep high brightness and indeformable, generate the big image of projection of high quality.
Optionally, refractor group 200 has same primary optical axis with speculum 300.
By the setting coaxial with speculum 300 of refractor group 200, complexity during lens design is reduced, it can be with Improve projection accuracy.The display chip 100 of entire camera lens, the refractor group 200 of multiple lens composition, speculum 300 all exist On same primary optical axis, light is paraxial rays, meets the pupil matching principle of lighting system and imaging system, reduces prism The use of system, the distance of each lens passes through calculated equilibrium aberration with relative position in camera lens.
Embodiment two
Fig. 2 is the structure diagram for ultrashort out-of-focus projection's camera lens that the utility model embodiment two provides, and the present embodiment is real A specific example on the basis of example one is applied, referring to Fig. 2, ultrashort out-of-focus projection's camera lens provided in this embodiment includes display chip 100th, refractor group 200 and speculum 300, wherein, display chip 100 can be 0.65 inch of 4096 × 2160 resolution ratio Digital Micromirror Device, for providing high definition projection object plane;Refractor group 200 includes 15 spherical lenses, 15 spherical surfaces Lens co-axial alignment, including the first lens 201, the second lens 202, the 3rd lens 203, the 4th lens set gradually along light path 204th, the 5th lens 205, the 6th lens 206, the 7th lens 207, the 8th lens 208, the 9th lens 209, the tenth lens 210, 11st lens 211, the 12nd lens 212, the 13rd lens 213, the 14th lens 214 and the 15th lens 215;First thoroughly Mirror 201 be a positive meniscus lens, the second lens 202 be a positive meniscus lens, the 3rd lens 203 be a positive meniscus lens, the 4th Lens 204 be a diverging meniscus lens, the 5th lens 205 be a biconvex lens, the 6th lens 206 be a diverging meniscus lens, the 7th Lens 207 be a biconvex lens, the 8th lens 208 be a diverging meniscus lens, the 9th lens 209 be a positive meniscus lens, the tenth Lens 210 are a positive meniscus lens, and the 11st lens 211 are a diverging meniscus lens, and the 12nd lens 212 are saturating for a positive bent moon Mirror, the 13rd lens 213 are a biconcave lens, and the 14th lens 214 are a positive meniscus lens, and the 15th lens 215 are negative for one Meniscus lens.
Wherein, optionally, the material of 15 spherical lenses of refractor group 200 is environment-friendly type glass, also, can Selection of land, the design parameter of 15 spherical lenses is as shown in table 1, and each spherical lens size and spacing are set by optical imaging concept Meter, is calculated and is optimized by computer, the good manufacturability and energy environmental protection of part.Wherein, the direction propagated along light The surface of each lens is numbered, obtains the surface number on each each surface of lens, for example, table is distinguished on surface 1 and surface 2 Show the first surface and second surface of the first lens 201, and so on.It is understood that 1 infinite radius of surface represents surface 1 is plane.
1 spherical lens parameter list of table
Optionally, the ultrashort out-of-focus projection's camera lens of the present embodiment further includes aperture diaphragm (not shown in Fig. 2), and aperture diaphragm is set Between the 4th lens 204 and the 5th lens 205, for controlling the brightness of the depth of field, the scope of imaging object space and picture.
Light can converge to form an intermediary image after by the 4th lens 204, can by the setting of aperture diaphragm To improve the image quality of optical axis exterior point, the depth of field is controlled, improves image quality, improves the clarity of picture.By the 15th lens It after 215, can converge to form second of intermediary image, the projected picture of amplification is obtained after the reflection of speculum 300.
After light enters the 5th lens 205, effectively reduced after the 5th lens 205 are reflected with the 6th lens 206 Spherical aberration and aberration reduce the generation of halation.The modulation of 7th lens 207 to the 15th lens 215, balances that above-mentioned remaining is several Aberration increases light path by the reflection of speculum 300, is formed greatly and clearly without curved image, improved after changing light-emitting angle Image quality.
Optionally, ultrashort out-of-focus projection's system provided in this embodiment further includes refracting prisms 400 and lighting source 500;Folding Prism 400 is penetrated between display chip 100 and refractor group 200, refracting prisms include the first incidence surface, the second incidence surface And light-emitting surface, the first incidence surface intersect with the second incidence surface and light-emitting surface;The light-emitting surface and refracting prisms of lighting source 500 400 the first incidence surface is oppositely arranged, and the light emission side of display chip 100 is oppositely arranged with the second incidence surface of refracting prisms 400, The incidence surface of refractor group 200 and the light-emitting surface of refracting prisms 400 are oppositely arranged, and refracting prisms 400 are used for refracting illumination light The illuminating bundle that source 500 is sent is to display chip 100.
It is understood that by taking Fig. 2 as an example, the illuminating bundle that lighting source 500 is sent enters from the first of refracting prisms 400 Smooth surface (being 400 upper surface of refracting prisms in Fig. 2 views) enters to inject refracting prisms 400, by 400 internal refraction face of refracting prisms Effect, be emitted to through the second incidence surface (400 left surface of refracting prisms in Fig. 2 views) on display chip 100, display chip 100, by modulated illumination, form object plane outgoing to be projected, refracting prisms 400 are incided by the second incidence surface, through superrefraction Refractor group 200 is incided into after 400 light-emitting surface of prism (400 right surface of refracting prisms in Fig. 2 views).
Optionally, speculum 300 is non-spherical reflector.Non-spherical reflector is concave surface, and its face type is by formula:
It determines, 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 the corresponding coefficient of even order terms, it is specific Parameter is as shown in table 2.
2 mirror surface shape parameter of table
Curved surface face type by the speculum 300 designed above has more degree of freedom, can effectively reduce light warp The remaining curvature of field and distortion after superrefraction lens group 200 make imaging keep high brightness and indeformable, and the projection for generating high quality is big Image.
Optionally, refractor group 200 has same primary optical axis with speculum 300.
By the setting coaxial with speculum 300 of refractor group 200, complexity during lens design is reduced, it can be with Improve projection accuracy.The refractor group 200 of 100,15 lens compositions of display chip of entire camera lens, speculum 300 is all On same primary optical axis, light is paraxial rays, meets the pupil matching principle of lighting system and imaging system, reduces rib The use of mirror system, the distance of each lens passes through calculated equilibrium aberration with relative position in camera lens.
When designing projection lens, parameter of the projection than referring to projector distance and picture width ratio is projected than smaller, said The picture that bright same distance is projected out is bigger, and industry will generally project and be defined as ultrashort out-of-focus projection than the projection lens less than 0.38 Camera lens.
Fig. 3 is the imaging optical path principle schematic of ultrashort out-of-focus projection's camera lens provided in this embodiment, provided in this embodiment The projection of ultrashort out-of-focus projection's camera lens is compared for 0.21, it is possible to provide 135 °~140 ° of field angle, magnifying power are 138~169, Ke Yi Realize that 90~110 inches of high-resolution shows picture at 420mm~510mm projector distances.
The modulation transfer function curve synoptic diagram for a certain each visual field of display picture that Fig. 4 projects for the present embodiment, this reality The Digital Micromirror Device that example uses 0.65 inch is applied, resolution ratio is 4096 × 2160, projector distance 465mm, and picture dimension is 100 inches, since MTF numerical requirements of the human eye vision resolution ratio under different space frequency are different, the present embodiment requirement MTF should More than 0.3.The corresponding Y values of abscissa 0.75lp/mm (line right/millimeter) of MTF curve are all higher than 0.45 in Fig. 4, because And it can realize high definition picture quality and be imaged.
The technical solution of the present embodiment, the projection of camera lens are compared for 0.21, it is possible to provide 135 °~140 ° of field angle, magnifying power For 138~169, it can realize that 90~110 inches of high-resolution shows picture at 420mm~510mm projector distances;Refraction is saturating 15 lens of microscope group all select spherical lens, can by setting aperture diaphragm between the 4th lens and the 5th lens To improve the image quality of optical axis exterior point, the depth of field is controlled, improves image quality, improves the clarity of picture;And without non-in designing Spherical lens is conducive to processing and volume production;Without cemented doublet, high temperature is avoided to cause glued damage.
Embodiment three
Fig. 5 is the structure diagram for ultrashort out-of-focus projection's camera lens that the utility model embodiment three provides, and the present embodiment is real Another specific example on the basis of example one is applied, referring to Fig. 5, ultrashort out-of-focus projection's camera lens provided in this embodiment includes display chip 100th, refractor group 200 and speculum 300, wherein, display chip 100 can be 0.47 inch of 4096 × 2160 resolution ratio Digital Micromirror Device, for providing high definition projection object plane;Refractor group 200 includes 15 spherical lenses, 15 spherical surfaces Lens co-axial alignment, including the first lens 201, the second lens 202, the 3rd lens 203, the 4th lens set gradually along light path 204th, the 5th lens 205, the 6th lens 206, the 7th lens 207, the 8th lens 208, the 9th lens 209, the tenth lens 210, 11st lens 211, the 12nd lens 212, the 13rd lens 213, the 14th lens 214 and the 15th lens 215;First thoroughly Mirror 201 be a biconvex lens, the second lens 202 be a biconvex lens, the 3rd lens 203 be a planoconvex spotlight, the 4th lens 204 For a biconcave lens, the 5th lens 205 are a planoconvex spotlight, and the 6th lens 206 are a biconvex lens, and the 7th lens 207 are one Biconcave lens, the 8th lens 208 are a biconvex lens, and the 9th lens 209 are a biconcave lens, and the tenth lens 210 are a biconvex Lens, the 11st lens 211 are a diverging meniscus lens, and the 12nd lens 212 are a positive meniscus lens, and the 13rd lens 213 are One biconvex lens, the 14th lens 214 are a positive meniscus lens, and the 15th lens 215 are a biconcave lens.
Wherein, optionally, the material of 15 spherical lenses of refractor group 200 is environment-friendly type glass, also, can Selection of land, the design parameter of 15 spherical lenses is as shown in table 3, and each spherical lens size and spacing are set by optical imaging concept Meter, is calculated and is optimized by computer, the good manufacturability and energy environmental protection of part.Wherein, the direction propagated along light The surface of each lens is numbered, obtains the surface number on each each surface of lens, for example, table is distinguished on surface 1 and surface 2 Show the first surface and second surface of the first lens 201, and so on.
3 spherical lens parameter list of table
Optionally, the ultrashort out-of-focus projection's camera lens of the present embodiment further includes aperture diaphragm (not shown in Fig. 5), and aperture diaphragm is set Between the 5th lens 205 and the 6th lens 206, for controlling the brightness of the depth of field, the scope of imaging object space and picture.
Light is by after the 5th lens 205, by the setting of aperture diaphragm, can improve optical axis exterior point into image quality Amount controls the depth of field, improves image quality, improves the clarity of picture.After the 15th lens 215, it can converge in being formed once Between picture, obtain the projected picture of amplification after the reflection of speculum 300.
Optionally, ultrashort out-of-focus projection's system that the utility model embodiment provides further includes refracting prisms 400 and illumination light Source 500;For refracting prisms 400 between display chip 100 and refractor group 200, refracting prisms include the first incidence surface, the Two incidence surfaces and light-emitting surface, the first incidence surface intersect with the second incidence surface and light-emitting surface;The light-emitting surface and folding of lighting source 500 The first incidence surface for penetrating prism 400 is oppositely arranged, the light emission side of display chip 100 and the second incidence surface phase of refracting prisms 400 To setting, the light-emitting surface of the incidence surface and refracting prisms 400 of refractor group 200 is oppositely arranged, and refracting prisms 400 are used to reflect The illuminating bundle that lighting source 500 is sent is to display chip 100.
It is understood that by taking Fig. 5 as an example, the illuminating bundle that lighting source 500 is sent enters from the first of refracting prisms 400 Smooth surface (being 400 upper surface of refracting prisms in Fig. 5 views) enters to inject refracting prisms 400, by 400 internal refraction face of refracting prisms Effect, be emitted to through the second incidence surface (400 left surface of refracting prisms in Fig. 5 views) on display chip 100, display chip 100, by modulated illumination, form object plane outgoing to be projected, refracting prisms 400 are incided by the second incidence surface, through superrefraction Refractor group 200 is incided into after 400 light-emitting surface of prism (400 right surface of refracting prisms in Fig. 5 views).
Optionally, speculum 300 is non-spherical reflector.Non-spherical reflector is concave surface, and its face type is by formula:
It determines, 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 the corresponding coefficient of even order terms, it is specific Parameter is as shown in table 4.
4 mirror surface shape parameter of table
Curved surface face type by the speculum 300 designed above has more degree of freedom, can effectively reduce light warp The remaining curvature of field and distortion after superrefraction lens group 200 make imaging keep high brightness and indeformable, and the projection for generating high quality is big Image.
Optionally, refractor group 200 has same primary optical axis with speculum 300.
By the setting coaxial with speculum 300 of refractor group 200, complexity during lens design is reduced, it can be with Improve projection accuracy.The refractor group 200 of 100,15 lens compositions of display chip of entire camera lens, speculum 300 is all On same primary optical axis, light is paraxial rays, meets the pupil matching principle of lighting system and imaging system, reduces rib The use of mirror system, the distance of each lens passes through calculated equilibrium aberration with relative position in camera lens.
Fig. 6 is the imaging optical path principle schematic of ultrashort out-of-focus projection's camera lens provided in this embodiment, provided in this embodiment The projection of ultrashort out-of-focus projection's camera lens is compared for 0.21, it is possible to provide 135 °~140 ° of field angle, magnifying power are 148~190, Ke Yi Realize that 70~90 inches of high-resolution shows picture at 330mm~410mm projector distances.
Fig. 7 is the modulation transfer function curve of a certain each visual field of display picture of the present embodiment projection, and the present embodiment is adopted With 0.47 inch of Digital Micromirror Device, resolution ratio is 4096 × 2160, and projector distance 370mm, picture dimension is 80 inches, Since MTF numerical requirements of the human eye vision resolution ratio under different space frequency are different, the present embodiment requirement MTF should be greater than 0.3. The corresponding Y values of abscissa 0.7lp/mm (line right/millimeter) of MTF curve are all higher than 0.5 in Fig. 7, thus can realize High definition picture quality is imaged.
The technical solution of the present embodiment, the projection of camera lens are compared for 0.21, it is possible to provide 135 °~140 ° of field angle, magnifying power For 148~190, it can realize that 70~90 inches of high-resolution shows picture at 330mm~410mm projector distances;Refraction is saturating 15 lens of microscope group all select spherical lens, can by being to set aperture diaphragm between the 5th lens and the 6th lens To improve the image quality of optical axis exterior point, the depth of field is controlled, improves image quality, improves the clarity of picture;And without non-in designing Spherical lens is conducive to processing and volume production;Without cemented doublet, high temperature is avoided to cause glued damage.
Note that it above are only the preferred embodiment of the utility model and institute's application technology principle.Those skilled in the art's meeting Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright Aobvious variation is readjusted and substituted without departing from the scope of protection of the utility model.Therefore, although passing through above example The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from In the case that the utility model is conceived, other more equivalent embodiments can also be included, and the scope of the utility model is by appended Right determine.

Claims (10)

1. a kind of ultrashort out-of-focus projection's camera lens, which is characterized in that including:
Display chip, for showing object plane to be projected;
The refractor group of the display chip light emission side is arranged at, the refractor group includes multiple lens, each described Mirror is spherical lens, for balancing the aberration that the projection object plane light passes through the refractor group and formed;
Speculum deviates from the one side of the display chip positioned at the refractor group, draws for reducing the refractor group The curvature of field risen and distortion, and reflection light form the projection image planes of amplification.
2. ultrashort out-of-focus projection's camera lens according to claim 1, which is characterized in that further include refracting prisms and lighting source;
For the refracting prisms between the display chip and the refractor group, the refracting prisms enter light including first Face, the second incidence surface and light-emitting surface, first incidence surface intersect with second incidence surface and the light-emitting surface;
The light-emitting surface of the lighting source and the first incidence surface of the refracting prisms are oppositely arranged, the light extraction of the display chip Side and second incidence surface of the refracting prisms are oppositely arranged, incidence surface and the refracting prisms of the refractor group The light-emitting surface be oppositely arranged, the refracting prisms are used to reflecting illuminating bundle that the lighting source sends to the display Chip.
3. ultrashort out-of-focus projection's camera lens according to claim 1, which is characterized in that the display chip is Digital Micromirror Device DMD。
4. ultrashort out-of-focus projection's camera lens according to claim 1, which is characterized in that the refractor group includes 15 balls Face lens, 15 spherical lens co-axial alignments, including set gradually along light path the first lens, the second lens, the 3rd Lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens, the 9th lens, the tenth lens, the 11st are thoroughly Mirror, the 12nd lens, the 13rd lens, the 14th lens and the 15th lens;
First lens are a positive meniscus lens, and second lens are a positive meniscus lens, and the 3rd lens is one just Meniscus lens, the 4th lens are a diverging meniscus lens, and the 5th lens are a biconvex lens, and the 6th lens are one Diverging meniscus lens, the 7th lens are a biconvex lens, and the 8th lens are a diverging meniscus lens, and the 9th lens are One positive meniscus lens, the tenth lens be a positive meniscus lens, the 11st lens be a diverging meniscus lens, the described tenth Two lens are a positive meniscus lens, and the 13rd lens are a biconcave lens, and the 14th lens are a positive meniscus lens, 15th lens are a diverging meniscus lens.
5. ultrashort out-of-focus projection's camera lens according to claim 4, which is characterized in that further include aperture diaphragm, the aperture light Door screen is arranged between the 4th lens and the 5th lens, for control the depth of field, be imaged object space scope and as Brightness.
6. ultrashort out-of-focus projection's camera lens according to claim 1, which is characterized in that the refractor group includes 15 balls Face lens, 15 spherical lens co-axial alignments, including set gradually along light path the first lens, the second lens, the 3rd Lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens, the 9th lens, the tenth lens, the 11st are thoroughly Mirror, the 12nd lens, the 13rd lens, the 14th lens and the 15th lens;
First lens are a biconvex lens, and second lens are a biconvex lens, and the 3rd lens are saturating for a plano-convex Mirror, the 4th lens are a biconcave lens, and the 5th lens are a planoconvex spotlight, and the 6th lens are a lenticular Mirror, the 7th lens are a biconcave lens, and the 8th lens are a biconvex lens, and the 9th lens are saturating for a concave-concave Mirror, the tenth lens are a biconvex lens, and the 11st lens are a diverging meniscus lens, and the 12nd lens is one just Meniscus lens, the 13rd lens are a biconvex lens, and the 14th lens are a positive meniscus lens, and the described 15th thoroughly Mirror is a biconcave lens.
7. ultrashort out-of-focus projection's camera lens according to claim 6, which is characterized in that further include aperture diaphragm, the aperture light Door screen is arranged between the 5th lens and the 6th lens, for control the depth of field, be imaged object space scope and as Brightness.
8. ultrashort out-of-focus projection's camera lens according to claim 1, which is characterized in that the speculum is non-spherical reflector.
9. ultrashort out-of-focus projection's camera lens according to claim 8, which is characterized in that the non-spherical reflector is concave surface, and Its face type 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>
It determines, 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 the corresponding coefficient of even order terms.
10. according to any ultrashort out-of-focus projection's camera lens of claim 1~9, which is characterized in that the refractor group and institute Speculum is stated with same primary optical axis.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109407288A (en) * 2018-12-17 2019-03-01 上海理工大学 A kind of refraction-reflection type ultra-short focus projection lens system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109407288A (en) * 2018-12-17 2019-03-01 上海理工大学 A kind of refraction-reflection type ultra-short focus projection lens system
CN109407288B (en) * 2018-12-17 2020-12-25 上海理工大学 Refraction and reflection type ultra-short-focus projection lens system

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