CN106125266A - Projection lens and projection imaging system - Google Patents
Projection lens and projection imaging system Download PDFInfo
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- CN106125266A CN106125266A CN201610681557.5A CN201610681557A CN106125266A CN 106125266 A CN106125266 A CN 106125266A CN 201610681557 A CN201610681557 A CN 201610681557A CN 106125266 A CN106125266 A CN 106125266A
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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
- 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
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Abstract
The invention discloses a kind of projection lens, relate to projection art, it is possible to solve the problem that in correlation technique, the resolution of projection lens is relatively low.Projection lens includes: the first battery of lens, the second battery of lens and reflecting mirror；Described first battery of lens and described second battery of lens all include at least one non-spherical lens；The ratio of the first focal length and the second focal length is in the range of 59, and described first focal length is the equivalent focal length of described first battery of lens, and described second focal length is the equivalent focal length of described projection lens；3rd focal length is 7 100 with the ratio range of described second focal length, and described 3rd focal length is the equivalent focal length of described second battery of lens；4th focal length is 5 15 with the ratio range of described second focal length, and described 4th focal length is the focal length of described reflecting mirror；The described reflecting mirror described image strip after being corrected by described first battery of lens and described second battery of lens reflexes to projection screen.
Description
Technical field
The present invention relates to projection art, particularly to a kind of projection lens and projection imaging system.
Background technology
Along with the raising of science and technology, projector equipment application in people's work and life is more and more extensive, such as teaches
Educate, office, domestic or amusement.For the projector equipment used in home theater, the camera lens application of ultrashort out-of-focus projection is more, but uses
In the projection lens realizing short distance and projecting big picture, the aberration of each projection lens, such as distortion, astigmatism, the curvature of field, coma etc.,
Be the design of current projection lens upper must faced by a difficult problem.
In order to effectively overcome aberration, there are the design of three kinds of camera lenses, respectively refraction type, reflective and mixing at present
Formula.
Refraction type: projection lens is made up of spherical lens or non-spherical lens, image strip big angle after projection lens
Degree outgoing is to reach to shorten the purpose of projector distance.This type of projection lens can effectively eliminate the aberration that big visual field is brought, but
The number of lenses of projection lens is big, kind is many, and the structure of this type of projection lens is complicated, and the length of camera lens is not easy to reduce, and can make
The property made is low.
Reflective: projection lens is by plane mirror, spherical reflector, non-spherical reflector or free-form surface mirror group
Become, reach to shorten the purpose of projector distance by repeatedly deflecting refractive power.But there is multi-disc in the design form of this type of projection lens
Aspheric surface or free-form surface mirror, processing, manufacture, cost is high in the link such as detection, manufacturability is low.
Hybrid: by refraction type with reflective carry out integrated application, it is generally divided into refractor group, reflecting mirror group；Wherein
The reflecting mirror of reflecting mirror group can be divided into plane, convex surface, three kinds of forms of concave surface, but the solution of the projection lens of current this design
Analysing limited in one's ability, resolution is low, it is impossible to be used for projecting high-resolution projection picture.
Summary of the invention
In order to solve the problem that the resolution of projection lens is relatively low present in correlation technique, the present invention provides a kind of projection
Camera lens and projection imaging system.
First aspect according to embodiments of the present invention, it is provided that a kind of projection lens, described projection lens is along image strip
The direction of incidence transmission includes successively: the first battery of lens, the second battery of lens and reflecting mirror, described first battery of lens, described second
Battery of lens and described reflecting mirror are in same optical axis；
Described first battery of lens and described second battery of lens all include at least one non-spherical lens；
The ratio of the first focal length and the second focal length in the range of 5-9, described first focal length be described first battery of lens etc.
Effect focal length, described second focal length is the equivalent focal length of described projection lens；
3rd focal length is 7-100 with the ratio range of described second focal length, and described 3rd focal length is described second battery of lens
Equivalent focal length；
4th focal length is 5-15 with the ratio range of described second focal length, and described 4th focal length is Jiao of described reflecting mirror
Away from；
The described reflecting mirror described image light after being corrected by described first battery of lens and described second battery of lens
Bundle reflexes on projection screen.
Second aspect according to embodiments of the present invention, it is provided that a kind of projection imaging system, described projection imaging system includes
Light valve and the projection lens provided such as first aspect according to embodiments of the present invention；The biasing of described light valve and described projection lens
Head；Described light valve produces image strip when by illumination, and by projection lens described in described image strip directive.
The projection lens provided in the embodiment of the present invention, including the first battery of lens, the second battery of lens and reflecting mirror, this is first years old
Battery of lens and this second battery of lens all include at least two non-spherical lens, and image strip is had well by this non-spherical lens
Calibration capability, thus decrease the quantity of the spherical lens that projection lens includes, not only simplify the structure of projection lens, also
Substantially reduce the focal length of projection lens；Achieve the effect of ultrashort out-of-focus projection.
It should be appreciated that it is only exemplary that above general description and details hereinafter describe, can not be limited this
Invention.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet the enforcement of the present invention
Example, and in description together for explaining the principle of the present invention.
Fig. 1 is the schematic diagram according to a kind of projection lens shown in an exemplary embodiment；
Fig. 2 is the schematic diagram according to a kind of projection lens shown in another exemplary embodiment；
Fig. 3 is the schematic diagram according to the another a kind of projection imaging system shown shown in illustrative embodiments；
Fig. 4 is the schematic diagram according to a kind of projection lens imaging contrast shown in an exemplary embodiment；
Fig. 5 is the schematic diagram of the light path according to another this projection imaging system imaging a kind of shown shown in illustrative embodiments；
Fig. 6 is the use schematic diagram according to another this projection imaging system a kind of shown shown in illustrative embodiments.
Detailed description of the invention
Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.Explained below relates to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the present invention.On the contrary, they are only with the most appended
The example that some aspects that described in detail in claims, the present invention are consistent.
Embodiment one
Fig. 1 is the schematic diagram according to a kind of projection lens shown in an exemplary embodiment, as it is shown in figure 1, this projection lens
Head includes successively along the direction of image strip incidence transmission: the first battery of lens the 110, second battery of lens 120 and reflecting mirror 130.
This first battery of lens 110, this second battery of lens 120 and this reflecting mirror 130 are in same optical axis 101；
Described first battery of lens 110 and described second battery of lens 120 all include at least one non-spherical lens；
The ratio of the first focal length and the second focal length is in the range of 5-9, and the first focal length is that the equivalence of the first battery of lens 110 is burnt
Away from, the second focal length is the equivalent focal length of projection lens；
The ratio range of the 3rd focal length and the second focal length is 7-100, and the 3rd focal length is that the equivalence of the second battery of lens 120 is burnt
Away from；
The ratio range of the 4th focal length and the second focal length is 5-15, and the 4th focal length is the focal length of reflecting mirror 130；
The reflecting mirror 130 image strip after being corrected by the first battery of lens 110 and the second battery of lens 120 is reflexed to
On projection screen.
In sum, the projection lens provided in the embodiment of the present invention wraps successively along the direction of image strip incidence transmission
Including the first battery of lens, the second battery of lens and reflecting mirror, this first battery of lens and this second battery of lens all include at least two aspheric
Face lens, this non-spherical lens has good calibration capability, thus decreases the ball that projection lens includes image strip
The quantity of face lens, not only simplify the structure of projection lens, also substantially reduces the focal length of projection lens；Achieve ultrashort Jiao
The effect of projection；It addition, be provided with at least one spherical lens between this at least two non-spherical lens, spherical lens and non-
The alternate setting of spherical lens, the image strip that instant correction spherical lens does not correct so that image strip is corrected immediately,
Reach to improve the effect of projection lens resolution, and then realize the ultrashort out-of-focus projection of high-res.
Embodiment two
Fig. 2 is the schematic diagram according to a kind of projection lens shown in another exemplary embodiment, as in figure 2 it is shown, projection lens
Head includes successively along the direction of image strip incidence transmission: the first battery of lens the 210, second battery of lens 220 and reflecting mirror 230.
First battery of lens the 210, second battery of lens 220 and reflecting mirror 230 are in same optical axis.
First battery of lens 210 and the second battery of lens 220 all include at least one non-spherical lens.
Optionally, the first battery of lens 210 and the second battery of lens 220 all include two non-spherical lenses and at least one sphere
It is provided with at least one spherical lens between lens, and two non-spherical lenses；When this first battery of lens of this image strip directive
210 and during the second battery of lens 220, the first battery of lens 210 and the second battery of lens 220 correct this image strip, and will be after correction
This reflecting mirror 230 of this image strip directive.
It addition, the ratio of the first focal length and the second focal length is in the range of 5-9, this first focal length is this first battery of lens 210
Equivalent focal length, this second focal length is the equivalent focal length of this projection lens.
It addition, the ratio range of the 3rd focal length and this second focal length is 7-100, the 3rd focal length is this second battery of lens
The equivalent focal length of 220.
It addition, the ratio range of the 4th focal length and this second focal length is 5-15, the 4th focal length is Jiao of this reflecting mirror 230
Away from.
By the restriction to each equivalent focal length so that between first battery of lens the 210, second battery of lens 220 and reflecting mirror 230
Cooperate, reach to improve the projection lens effect to image strip calibration capability.
This reflecting mirror 230 this image light after being corrected by this first battery of lens 210 and this second battery of lens 220
Bundle reflexes on projection screen.
Optionally, this reflecting mirror 230 is concave surface non-spherical reflector or free-form surface mirror.
Optionally, see Fig. 2, as in figure 2 it is shown, this first battery of lens 210 depends on along the direction of image strip incidence transmission
Secondary include the first non-spherical lens 211 and the second non-spherical lens 212, the first non-spherical lens 211 and the second non-spherical lens
212 are in same optical axis 201 with projection lens.
Optionally, see Fig. 2, as in figure 2 it is shown, this second battery of lens 220 depends on along the direction of image strip incidence transmission
Secondary the 3rd non-spherical lens 221 and the 4th non-spherical lens 222 that include, the 3rd non-spherical lens 221 and the 4th non-spherical lens
222 are in same optical axis 201 with this projection lens.
It addition, affect this first non-spherical lens 211, this second non-spherical lens the 212, the 3rd non-spherical lens 221
The order of the higher order coefficient of aspherical equation is had with the imaging factors of the 4th non-spherical lens 222, the curvature of non-spherical lens,
The circular cone coefficient of non-spherical lens and the diopter of non-spherical lens.
The order of the higher order coefficient of this aspherical equation affects this non-spherical lens edge analytic ability to imaging, when this
When the order of the higher order coefficient of aspherical equation is the highest, the shape that the curved surface of this aspherical equation comprises is the most complicated, to this image
The calibration capability of the light of light beam is the best.
This curvature is the inverse of the spherical radius of the close primary optical axis part of non-spherical lens.The present embodiment is only to curvature
Positive and negative limiting, the curvature of the reverse optical path direction of convex surface of acquiescence non-spherical lens is just.
The shape of the curved surface of the dipped beam axle of this circular cone index impacts non-spherical lens, when the circular cone coefficient of non-spherical lens is
When zero, the curved surface of the dipped beam axle of non-spherical lens generally circular in shape, it is mainly used in correcting the intelligent of this image strip rim ray
Difference.If this circular cone coefficient is chosen improper, light beam steering can be caused improper, cause image blur problem.
This diopter affects the non-spherical lens degree of deflection to light, and the biggest non-spherical lens of diopter is to image strip
Degree of deflection the biggest, be mainly used in the coma correcting this image strip away from primary optical axis part.Acquiescence shape such as non-spherical lens
The diopter of convex lens be just, the diopter of the concavees lens of shape such as non-spherical lens is negative.
Concrete, this first non-spherical lens 211, this second non-spherical lens the 212, the 3rd non-spherical lens 221 and
The order of the higher order coefficient of this aspherical equation of the 4th non-spherical lens 222, this curvature, this circular cone coefficient and this diopter
Meet respectively and require as follows:
The order of the higher order coefficient of the aspherical equation of this first non-spherical lens 211 is more than or equal to presetting the first threshold
Value；The order of this higher order coefficient of the aspherical equation of this second non-spherical lens 212 is more than or equal to preset Second Threshold, by
When the order of the higher order coefficient when this aspherical equation is the highest, the shape that the curved surface of this aspherical equation comprises is the most complicated, right
The calibration capability of the light of this image strip is the best, but manufactures the most difficult, and cost is the highest, in order to not affect this image
The correction of light beam, the most not to causing big difficulty, the order of the higher order coefficient of aspherical equation can be according to practical situation
It is determined.Or this preset first threshold value and this default Second Threshold can be carried out in conjunction with other configuring condition of projection lens
Arranging, this preset first threshold value can be equal to this default Second Threshold, such as, in the present invention this projection lens include non-
The order of this higher order coefficient of spherical lens is more than or equal to 10, and such as, this preset first threshold value and this default Second Threshold are equal
It is 10, or, this preset first threshold value is 10 and this default Second Threshold is 12.
Optionally, the curvature in two faces that this first non-spherical lens 211 includes is contrary sign, to reduce incident image light
The incident angle of bundle.For this first non-spherical lens 211, the face of image strip incidence is convex surface, and another face is concave surface, uses
Angle in correction paraxial rays.The curvature in two faces of this second non-spherical lens is jack per line, and this second aspheric surface is saturating simultaneously
Two faces of mirror are convex surface, for spherical aberration corrector and coma, thus improve the projection lens calibration capability to image strip.
Optionally, the circular cone coefficient of this first non-spherical lens is not equal to 0, the circular cone coefficient etc. of this second non-spherical lens
In 0；
Optionally, the diopter of this first non-spherical lens is negative, and the diopter of this second non-spherical lens is negative.Pass through
Dioptric positive and negative cooperation corrects this image strip away from the light beam of primary optical axis, thus reaches intelligent away from primary optical axis part of correction
Difference.
Optionally, the order of the higher order coefficient of the aspherical equation of the 3rd non-spherical lens is more than or equal to presetting the 3rd
Threshold value, the order of the higher order coefficient of the aspherical equation of the 4th non-spherical lens is more than or equal to preset the 4th threshold value, due to
When the order of the higher order coefficient of this aspherical equation is the highest, the shape that the curved surface of this aspherical equation comprises is the most complicated, to this
The calibration capability of the light of image strip is the best, but manufactures the most difficult, and cost is the highest, in order to not affect this image light
The correction of bundle, the most not to causing big difficulty, the order of the higher order coefficient of aspherical equation can enter according to practical situation
Row determines.Or this presets the 3rd threshold value and this is preset the 4th threshold value and can set in conjunction with other configuring condition of projection lens
Putting, this presets the 3rd threshold value can preset the 4th threshold value equal to this, such as, this preset the 3rd threshold value and this to preset the 4th threshold value equal
Be 13, or, this preset the 3rd threshold value be 13 and this preset the 4th threshold value equal 14；
Optionally, the curvature in two faces of the 3rd non-spherical lens is jack per line, for the 3rd non-spherical lens 221,
The face of image strip incidence is concave surface, and another side is convex surface, main aberration correction, the song in two faces of the 4th non-spherical lens
Rate is contrary sign, and two faces of the 4th non-spherical lens are concave surface, main aberration correction simultaneously, and picture becomes；
Optionally, the circular cone coefficient of the 3rd non-spherical lens is equal to 0, and the circular cone coefficient of the 4th non-spherical lens is equal to
0；
Optionally, the diopter of the 3rd non-spherical lens is just, the diopter of the 4th non-spherical lens is just.Pass through
Dioptric positive and negative cooperation corrects this image strip away from the light beam of primary optical axis, thus reaches intelligent away from primary optical axis part of correction
Difference.
It addition, this preset first threshold value, this default Second Threshold, this preset the 3rd threshold value and this to preset the 4th threshold value permissible
For same predetermined threshold value.
Owing to non-spherical lens relatively spherical lens has compared more preferable curvature, aspheric and lens are from lens centre to edge
Continual curvature changes so that light collection, to same point, substantially eliminates spherical aberration produced by spherical lens.So should
First non-spherical lens 211, this second non-spherical lens the 212, the 3rd non-spherical lens 221 and the 4th non-spherical lens
222 image quality being greatly improved this projection lens.Concrete, this first non-spherical lens 211 and the 4th non-spherical lens
222 are used for reducing coma and astigmatism, and this second non-spherical lens 212 and the 3rd non-spherical lens 221 are used for improving big visual field
Resolution.
It addition, for non-spherical lens, when the thickness of non-spherical lens is the thickest, the strongest to the calibration capability of aberration.But
It is to consider that the problem such as manufacture difficulty and production cost combines the thickness selecting non-spherical lens in actual applications so that select
Non-spherical lens i.e. have good aberration correcting capability, do not result in manufacture difficulty big, the problems such as production cost is big yet.Ratio
As, the thickness range of the 3rd non-spherical lens 221 is 6 millimeters-12.5 millimeters.
Optionally, referring also to Fig. 2, as in figure 2 it is shown, this first battery of lens 210 includes 4 these at least one spherical lenss,
It is respectively as follows: the first spherical lens the 213, second spherical lens the 214, the 3rd spherical lens 215 and the 4th spherical lens 216.If
In projection lens, non-spherical lens all selected by most lens, can be greatly increased the manufacturing cost of projection lens, therefore, not
On the premise of affecting imaging, it is also possible to being selected by part lens is spherical lens, to reduce manufacturing cost.
Optionally, this first non-spherical lens 211, this second non-spherical lens 212, this first spherical lens 213, this
Two spherical lens the 214, the 3rd spherical lenss 215 and the 4th spherical lens 216 are in same optical axis 201, and each other
Position relationship can be position as shown in Figure 2.Wherein, spherical lens and non-spherical lens cooperate, and jointly correct shadow
As light beam, to reach to improve the effect of imaging effect.
Optionally, the 3rd spherical lens 215 and the 4th spherical lens 216 gluing are an entirety, obtain the first glue
Zoarium, the refractive index of the 3rd spherical lens 215 is more than the refractive index of the 4th spherical lens 216, the 3rd spherical lens 215
Abbe number less than the Abbe number of the 4th spherical lens 216.Wherein, refractive index is for representing the refraction journey of lens on light line
Degree, when this refractive index is the biggest, extent of refraction is the biggest, therefore, to this image strip during this projection lens imaging
Light splitting effect is the biggest.Wherein, Abbe number is for representing the lens medium degree of dispersion to light, and Abbe number is the lowest, and dispersion is the most severe.
Optionally, the diopter of this first spherical lens 213 be bear, the diopter of this second spherical lens 214 for negative, should
The diopter of the 3rd spherical lens 215 be just with the diopter of the 4th spherical lens 216 for just.By dioptric positive and negative cooperation
Correct this image strip light beam away from primary optical axis, thus reach to correct the coma away from primary optical axis part.
Optionally, referring also to Fig. 2, as in figure 2 it is shown, this second battery of lens 220 includes 7 these at least one spherical lenss,
It is respectively as follows: the 5th spherical lens the 223, the 6th spherical lens the 224, the 7th spherical lens the 225, the 8th spherical lens the 226, the 9th ball
Face lens the 227, the tenth spherical lens the 228, the 11st spherical lens 229.
Wherein, the 3rd non-spherical lens the 221, the 4th non-spherical lens the 222, the 5th spherical lens the 223, the 6th
Spherical lens the 224, the 7th spherical lens the 225, the 8th spherical lens the 226, the 9th spherical lens the 227, the tenth sphere
Lens the 228, the 11st spherical lens 229 is in same optical axis 201.
Optionally, the 6th spherical lens 224 and the 7th spherical lens 225 gluing are an entirety, obtain second glued
Body, the refractive index of the 6th spherical lens 224 is less than the refractive index of the 7th spherical lens 225, the 6th spherical lens 224
Abbe number is less than the Abbe number of the 7th spherical lens 225.
Optionally, the 8th spherical lens 226 and the 9th spherical lens 227 gluing are an entirety, obtain the 3rd glued
Body, the refractive index of the 8th spherical lens 226 is more than the refractive index of the 9th spherical lens 227, the 8th spherical lens 226
Abbe number is more than the Abbe number of the 9th spherical lens 227.
Optionally, the diopter of the 5th spherical lens 223 be just, the diopter of the 6th spherical lens 224 for negative, should
The diopter of the 7th spherical lens 225 be bear, the diopter of the 8th spherical lens 226 be just, the 9th spherical lens 227
Diopter be bear, the diopter of the tenth spherical lens 228 be just, the diopter of the 11st spherical lens 229 be negative.
This first veneer, this second veneer and the 3rd veneer, for improving the different spectrum of this projection lens
Spherical aberration, and the axial chromatic aberration of this projection lens, axial chromatic aberration of hanging down are corrected.In this each veneer included each
Mirror is made up of the material of different Abbe numbers, and the material of different Abbe numbers exists different dispersions to different spectrum, and by with
Curvature coordinates the function reaching correcting chromatic aberration.
Optionally, referring also to Fig. 2, as in figure 2 it is shown, this first battery of lens 210 is along the direction of image strip incidence transmission
Include successively: this first spherical lens 213, this first non-spherical lens 211, this second spherical lens the 214, the 3rd sphere are saturating
Mirror the 215, the 4th spherical lens 216, this second non-spherical lens 212.This second battery of lens 220 passes along image strip incidence
Defeated direction includes successively: the 3rd non-spherical lens 221, the 5th spherical lens 223, the 6th spherical lens 224, this
Seven spherical lens the 225, the 8th spherical lens the 226, the 9th spherical lens the 227, the tenth spherical lens the 228, the 11st balls
Face lens 229 and the 4th non-spherical lens 222.
Optionally, this first spherical lens 213 and this first non-spherical lens 211 do not result in considerable influence to imaging,
So the position of this first spherical lens 213 and this first non-spherical lens 211 can exchange.
Optionally, this first non-spherical lens 211, this second non-spherical lens the 212, the 3rd non-spherical lens 221 and
4th non-spherical lens 222 is symmetric aspheres lens, due to the regular shape of symmetric aspheres lens, it is simple to processing system
Make, so when this first non-spherical lens 211, this second non-spherical lens the 212, the 3rd non-spherical lens 221 and the 4th
When non-spherical lens 222 is symmetric aspheres lens, easy to process, reduce production cost.
Optionally, referring also to Fig. 2, as in figure 2 it is shown, this projection lens also includes aperture diaphragm 240, this aperture diaphragm 240
Between this first battery of lens 210 and this second battery of lens 220, this aperture diaphragm 240 is in same light with this projection lens
Axle 201, this aperture diaphragm 240 is for limiting the logical light quantity of this projection lens so that the logical light quantity of image strip is limited in be had most
It is beneficial in the situation of imaging, thus improves the effect of imaging.
It addition, this projection lens is ultrashort out-of-focus projection camera lens, the projection ratio of this projection lens is in the range of 0.2-0.3.Throw
The projection ratio of shadow camera lens is in the range of 0.2-0.3, to reach the purpose of ultrashort out-of-focus projection.Optionally, implement in another exemplary
In example, the scope of the projection ratio of projection lens can be 0.24-0.25.
It addition, the ratio of battery of lens length and battery of lens reflecting mirror distance is in the range of 0.65-0.70, these lens group leader
Degree is this first battery of lens 210 and the total length of this second battery of lens 220, this battery of lens reflecting mirror distance for image strip at this
The eye point of the second battery of lens 220 and image strip distance between the incidence point of this reflecting mirror 230.
It addition, see Fig. 3, Fig. 3 is that the contrast of the imaging according to a kind of projection lens shown in an exemplary embodiment is shown
It is intended to.As it is shown on figure 3, reticule in Fig. 3 (+) be pre-image space, cross (x) is actual imaging position, then in Fig. 3 cross with
Reticule intersection point registration is the highest, and to be illustrated as the distortion of picture the most inconspicuous.From the figure 3, it may be seen that this imaging cross and reticule intersection point weight
Right higher, therefore, the degree of distortion of the imaging of this projection lens is relatively low.
It addition, the modulation tansfer function of projection lens that the present invention provides is more than 60%, resolution reach 93 lines right/millisecond,
Effective focal length is-3.38 or-3.47, and side-play amount is 142%-150%, projection image a size of 80-120.
It addition, this projection lens can resolve the image of 4K pixel so that projection screen can present the image of more high definition,
Promote Consumer's Experience.
It addition, this projection lens can also include the 3rd battery of lens, the 4th battery of lens or the battery of lens of greater number, pass through
More battery of lens carries out correction repeatedly to image strip, is projected out apparent imaging.
In sum, the projection lens provided in the embodiment of the present invention includes the first battery of lens, the second battery of lens and reflection
Mirror, this first battery of lens and this second battery of lens all include at least two non-spherical lens, and this non-spherical lens is to image strip
Have good calibration capability, thus decrease the quantity of the spherical lens that projection lens includes, not only simplify projection lens
The structure of head, also substantially reduces the focal length of projection lens；Achieve the effect of ultrashort out-of-focus projection；It addition, in this at least two
It is provided with the alternate setting of at least one spherical lens, spherical lens and non-spherical lens between non-spherical lens, immediately corrects ball
The image strip that face lens do not correct so that image strip is corrected immediately, reaches to improve the effect of projection lens resolution
Really, and then realize the ultrashort out-of-focus projection of high-res.
Embodiment three
Fig. 4 is according to the another a kind of projection imaging system schematic diagram shown shown in illustrative embodiments.As shown in Figure 4, this throwing
Shadow imaging system includes light valve 250 and projection lens as shown in Figure 2.
This light valve 250 is in same optical axis 201 with projection lens；
This light valve 250 produces image strip when by illumination, and is reflexed on this projection lens by this image strip；
Optionally, this light valve 250 be digital micromirror elements (English: Digital Micromirror Device, be called for short:
DMD), this DMD can be 2K resolution or 3K resolution.
It addition, how this light valve 250 relevant produces image strip is prior art, it is not described in detail at this.
Optionally, seeing Fig. 4, as shown in Figure 4, this projection imaging system also includes: total-reflection prism group 260, this is all-trans
Penetrate prism group 260 to be arranged between this light valve 250 and this first battery of lens, at this total-reflection prism group 260 and this projection lens
In same optical axis 201, this total-reflection prism group 260 is used for so that this image strip becomes collimated light beam, thus improves final one-tenth
The smoothness of picture.
Owing to total reflection prism is to injecting its interior light and have the effect of parallel injection, therefore when the injustice of this light valve 250
During row image strip this total-reflection prism group 260 of directive, this total reflection prism 270 makes the parallel injection of this image strip, thus
Make this image strip become uniform, thus improve the smoothness of imaging.
Penetrate the other way around further, since total reflection prism also can inject its interior light beam, so so that image
Light beam can be by this total-reflection prism group 260 directive the first battery of lens 210, and this total-reflection prism group 260 includes that 2 are all-trans
Penetrate prism.
Optionally, this total reflection prism 270 can also include 4,6 or other the most several total reflection prisms of 2.
It addition, the ratio of light valve distance of camera lens and this battery of lens reflecting mirror distance is in the range of 0.2-0.35, this light valve mirror
Head distance for this image strip from the eye point of light valve 250 to this image strip from the first battery of lens 210 incidence point away from
From.
It addition, see Fig. 5, Fig. 5 is according to another this projection imaging system imaging a kind of shown shown in illustrative embodiments
The schematic diagram of light path.As it is shown in figure 5, when this light valve 250 is by illumination, the image that this light valve 250 presents is formed image
Light beam, after this image strip is by this total-reflection prism group 260, this image strip becomes uniform, and then this image strip enters
This first battery of lens 210, this first battery of lens 210 has optically focused effect, when this image strip is by this first battery of lens 210
After, the light of this image strip is polymerized to a certain extent, when this image strip is after this first battery of lens 210 penetrates, after polymerization
This image strip enters this aperture diaphragm 240, and this aperture diaphragm 240 is for controlling the logical light quantity of this projection lens so that when this
Image strip obtains being suitable for the logical light quantity of this projection lens from the injection of this aperture diaphragm 240, subsequently into this second battery of lens
220, this second battery of lens 220 has the effect of light splitting, after this image strip enters this second battery of lens 220, and this image light
Bundle separately, and penetrates from this second battery of lens, and carries out imaging for the first time, after this first time imaging projects this reflecting mirror 230,
This image strip is reflected away by this reflecting mirror 230, carries out second time imaging on the projection screen, and is shown by projection screen
This second time imaging.
It addition, see Fig. 6, Fig. 6 is the use according to another this projection imaging system a kind of shown shown in illustrative embodiments
Schematic diagram.As shown in Figure 6, imaging for the first time is reflected by the reflecting mirror 230 of this projection lens, and carries out second time imaging, should
Imaging for the second time reflexes on projection screen 270, shows this imaging by this projection screen 270.
In sum, the projection imaging system provided in the embodiment of the present invention, including light valve and projection lens, due to this throwing
Shadow camera lens can realize the ultrashort out-of-focus projection of high-res, so including that the projection imaging system of this projection lens can also realize height
The ultrashort out-of-focus projection of resolution.
Those skilled in the art, after considering description and putting into practice invention disclosed herein, will readily occur to its of the present invention
Its embodiment.The application is intended to any modification, purposes or the adaptations of the present invention, these modification, purposes or
Person's adaptations is followed the general principle of the present invention and includes the undocumented common knowledge in the art of the present invention
Or conventional techniques means.Description and embodiments is considered only as exemplary, and the true scope of the present invention is pointed out by claim.
It should be appreciated that the invention is not limited in precision architecture described above and illustrated in the accompanying drawings, and
And various modifications and changes can carried out without departing from the scope.The scope of the present invention is only limited by appended claim.
Claims (10)
1. a projection lens, it is characterised in that described projection lens includes successively along the direction of image strip incidence transmission:
First battery of lens, the second battery of lens and reflecting mirror, described first battery of lens, described second battery of lens and described reflecting mirror are in same
One optical axis；
Described first battery of lens and described second battery of lens all include at least one non-spherical lens；
The ratio of the first focal length and the second focal length is in the range of 5-9, and described first focal length is that the equivalence of described first battery of lens is burnt
Away from, described second focal length is the equivalent focal length of described projection lens；
The ratio range of the 3rd focal length and described second focal length is 7-100, described 3rd focal length be described second battery of lens etc.
Effect focal length；
4th focal length is 5-15 with the ratio range of described second focal length, and described 4th focal length is the focal length of described reflecting mirror；
The described reflecting mirror described image strip after being corrected by described first battery of lens and described second battery of lens is anti-
It is mapped on projection screen.
Projection lens the most according to claim 1, it is characterised in that
Described first battery of lens includes the first non-spherical lens and second successively along the direction of described image strip incidence transmission
Non-spherical lens；
Described second battery of lens includes the 3rd non-spherical lens and the 4th successively along the direction of described image strip incidence transmission
Non-spherical lens.
Projection lens the most according to claim 2, it is characterised in that
Two face curvature contrary signs that described first non-spherical lens includes, two face curvatures that described second non-spherical lens includes
Jack per line；
Two face curvature jack per lines that described 3rd non-spherical lens includes, two face curvatures that described 4th non-spherical lens includes
Contrary sign.
Projection lens the most according to claim 2, it is characterised in that
The order of the higher order coefficient of the aspherical equation of described first non-spherical lens is more than or equal to preset first threshold value, described
The order of the higher order coefficient of the aspherical equation of the second non-spherical lens is more than or equal to presetting Second Threshold；
The order of the higher order coefficient of the aspherical equation of described 3rd non-spherical lens is more than or equal to presetting the 3rd threshold value, described
The order of the higher order coefficient of the aspherical equation of the 4th non-spherical lens is more than or equal to presetting the 4th threshold value.
Projection lens the most according to claim 1, it is characterised in that
Described first battery of lens includes two non-spherical lenses and four spherical lenss, and described first battery of lens is along described image
The direction of light beam incidence transmission includes negative dioptric first non-spherical lens, negative dioptric first spherical lens successively, bears
Dioptric second spherical lens, the 3rd spherical lens of positive diopter, the 4th spherical lens of positive diopter and negative diopter
The second non-spherical lens；
Or, described first battery of lens includes negative dioptric described the successively along the direction of described image strip incidence transmission
One spherical lens, negative dioptric described first non-spherical lens, negative dioptric described second spherical lens, positive diopter
Described 3rd spherical lens, described 4th spherical lens of positive diopter and negative dioptric described second non-spherical lens；Institute
State the lens in the first battery of lens and be in same optical axis.
Projection lens the most according to claim 1, it is characterised in that described second battery of lens is incident along described image strip
The direction of transmission includes successively: the 3rd non-spherical lens of positive diopter, the 5th spherical lens of positive diopter, negative dioptric
6th spherical lens, negative dioptric 7th spherical lens, the 8th spherical lens of positive diopter, negative dioptric 9th sphere
4th aspheric surface of lens, the tenth spherical lens of positive diopter, negative dioptric 11st spherical lens and positive diopter is saturating
Mirror.
Projection lens the most according to claim 1, it is characterised in that described projection lens also includes aperture diaphragm, described
Aperture diaphragm is between described first battery of lens and described second battery of lens, and described aperture diaphragm is in described projection lens
Same optical axis, described aperture diaphragm is for limiting the logical light quantity of described projection lens.
Projection lens the most according to claim 1, it is characterised in that battery of lens length and the ratio of battery of lens reflecting mirror distance
It is worth in the range of 0.65-0.70, a length of described first battery of lens of described battery of lens and the total length of described second battery of lens,
Described battery of lens reflecting mirror distance for described second battery of lens near one end of described reflecting mirror the length to described reflecting mirror.
Projection lens the most according to claim 1, it is characterised in that the projection ratio of described projection lens is in the range of 0.2-
0.3。
10. a projection imaging system, it is characterised in that described projection imaging system includes light valve and such as claim 1-9
Projection lens described in any one；Described light valve is offset to described projection lens, and described light valve produces image when by illumination
Light beam, and by projection lens described in described image strip directive.
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| CN201610681557.5A CN106125266B (en) | 2016-08-17 | 2016-08-17 | projection lens and projection imaging system |
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| CN201610681557.5A CN106125266B (en) | 2016-08-17 | 2016-08-17 | projection lens and projection imaging system |
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| CN111580267A (en) * | 2020-06-29 | 2020-08-25 | 歌尔光学科技有限公司 | Optical system and projection device |
| CN113534418A (en) * | 2021-09-07 | 2021-10-22 | 沂普光电(天津)有限公司 | Ultrashort burnt camera lens subassembly |
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| JP2014170127A (en) * | 2013-03-04 | 2014-09-18 | Ricoh Co Ltd | Projection optical system and image display device |
| CN104698574A (en) * | 2013-12-05 | 2015-06-10 | 台达电子工业股份有限公司 | Wide-angle projection optical system |
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| CN107015427A (en) * | 2017-02-24 | 2017-08-04 | 联想(北京)有限公司 | Projection arrangement and electronic equipment |
| 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 |
| CN113534418A (en) * | 2021-09-07 | 2021-10-22 | 沂普光电(天津)有限公司 | Ultrashort burnt camera lens subassembly |
| CN113534418B (en) * | 2021-09-07 | 2021-12-07 | 沂普光电(天津)有限公司 | Ultrashort burnt camera lens subassembly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106125266B (en) | 2018-11-20 |
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Effective date of registration: 20200817 Address after: 266555 Qian WAN port road, Huangdao District, Qingdao, Shandong Province, No. 218 Patentee after: Qingdao Hisense Laser Display Co.,Ltd. Address before: Donghai West Road 266071 Shandong city of Qingdao province No. 17 Patentee before: HISENSE Co.,Ltd. |