CN106094179B - A kind of lens assembly - Google Patents
A kind of lens assembly Download PDFInfo
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- CN106094179B CN106094179B CN201610677450.3A CN201610677450A CN106094179B CN 106094179 B CN106094179 B CN 106094179B CN 201610677450 A CN201610677450 A CN 201610677450A CN 106094179 B CN106094179 B CN 106094179B
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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Abstract
The invention discloses a kind of lens assembly, the direction along light beam incidence includes successively：First lens group, the second lens group, wherein the first lens group includes at least one spherical lens and the first non-spherical lens, the second non-spherical lens, at least provided with a spherical lens between two non-spherical lenses；Second lens group includes at least one spherical lens and third non-spherical lens, the 4th non-spherical lens, at least provided with a spherical lens between two non-spherical lenses；The lens assembly has positive diopter.By the combination settings of non-spherical lens and non-spherical lens and spherical lens, the aberration correcting capability that lens assembly is imaged light beam is improved, the imaging effect of high quality can be obtained.
Description
Technical field
This disclosure relates to optical image technology field, more particularly to a kind of lens assembly.
Background technology
Camera lens generally includes multi-disc lens subassembly, and using the refraction principle of light, carries out image imaging.In practical application
In, camera lens due to being influenced by factors such as optical design, processing technology and integration techno logies, to a certain size object at
Ideal seems impossible, and for its practical imaging with ideal as always variant, the difference of this imaging is known as camera lens（Or
Imaging optical system）Aberration.
Aberration is the image difference summarized in meaning, is generally included：Spherical aberration（Also known as spherical aberration）, refer to when along optical axis
The phenomenon that when parallel input light cannot be fully focused referred to as spherical aberration；Coma, refer to favour the parallel input light of optical axis can not be complete
The case where focusing referred to as coma；Astigmatism, when referring to object by lens imaging, there is a phenomenon where X-axis and Y-axis be imaged it is inconsistent；The curvature of field,
Even if referring to optical system can perfectly focus, but focussing plane and the inconsistent phenomenon of desired plane；Distortion, refers to i.e.
Allow to blur-free imaging, but there is a situation where inconsistent with the shape of the original；Aberration, referring to different light has different focusing
Point, such as deviation degree of the red primaries light because of deviation degree less than blue primary color light in white light, and focal length is more than blue
The focal length of primary lights leads to image frame colour cast；And wave aberration, the corrugated sent out from object point after perfect optical system,
Outgoing corrugated should be spherical surface, but practical corrugated has differences with ideal face, when practical corrugated and ideal corrugated are tangent at emergent pupil
When, the optical path difference between two corrugateds is that corrugated is poor.
Aberration is the physical condition by optical system（Optical characteristics index）Caused.In a sense, appoint
All there are a degree of aberrations for what optical system, and are also impossible to completely eliminate them in theory.Visually
With other light energy receivers also only have certain resolution capability, as long as therefore aberration numerical value be less than certain limit, we
The aberration for being considered as system is corrected.
The correction of aberration is most important in the design of lens assembly, determines the quality of lens imaging quality.
Invention content
In order to solve the problems, such as that there are aberrations to cause image quality poor for lens assembly in the related technology, the present invention provides one
Kind lens assembly, can improve aberration correction ability.
For achieving the above object, it adopts the following technical scheme that：
A kind of lens assembly, the direction along light beam incidence include successively：First lens group, the second lens group,
Wherein, the first lens group includes at least one spherical lens and the first non-spherical lens, the second non-spherical lens, and two
At least provided with a spherical lens between a non-spherical lens；
Second lens group includes at least one spherical lens and third non-spherical lens, the 4th non-spherical lens, and two non-
At least provided with a spherical lens between spherical lens；
The lens assembly has positive diopter；
Further, the first non-spherical lens is a meniscus, and the second non-spherical lens is a biconvex lens, and/or,
Third non-spherical lens is a concave-convex lens, and the 4th non-spherical lens is a biconcave lens；
Further, the first lens group includes the first non-spherical lens, the first spherical surface successively along the direction of light beam incidence
Lens, the second spherical lens, third spherical lens, the 4th spherical lens and the second non-spherical lens, the diopter of said lens
It is followed successively by negative, negative, negative, positive, positive and negative；
Alternatively, including the first spherical lens, the first non-spherical lens, the second spherical lens, third spherical lens, the 4th ball
Face lens and the second non-spherical lens, the diopters of said lens are followed successively by negative, negative, negative, positive, positive and negative；In first lens group
Lens are in same optical axis；
Further, the second lens group includes third non-spherical lens, the 5th spherical surface successively along the direction of light beam incidence
Lens, the 6th spherical lens, the 7th spherical lens, the 8th spherical lens, the 9th spherical lens, the tenth spherical lens, the 11st
Spherical lens and the 4th non-spherical lens, the diopters of said lens be followed successively by just, it is positive and negative, negative, positive, negative, positive, negative, positive；The
Lens in two lens groups are in same optical axis.
Further, the order of the higher order coefficient of the aspherical equation of the first non-spherical lens is greater than or equal to default first
The order of threshold value, the higher order coefficient of the aspherical equation of the second non-spherical lens is greater than or equal to default second threshold；
And the order of the higher order coefficient of the aspherical equation of third non-spherical lens is greater than or equal to default third threshold
The order of value, the higher order coefficient of the aspherical equation of the 4th non-spherical lens is greater than or equal to default 4th threshold value；
Further, third, the 4th spherical lens gluing are an entirety, and the refractive index of third spherical lens is more than the 4th
Spherical lens；
Further, the six, the 7th spherical lens gluings are an entirety, and the refractive index of the 6th spherical lens is less than the 7th
Spherical lens；
And the eight, the 9th spherical lens gluing be an entirety, the refractive index of the 8th spherical lens is more than the 9th spherical surface
Lens；
Further, the thickness of third non-spherical lens is T, meets 6mm<T<12.5mm.
Further, the first predetermined threshold value, the second predetermined threshold value, third predetermined threshold value, the 4th predetermined threshold value are to be more than
Integer equal to 10.
Above technical scheme of the present invention at least has the beneficial effect that：
In the lens assembly that technical solution of the present invention provides, including the first lens group and the second lens group, include two
Non-spherical lens and at least one spherical lens being set between each two non-spherical lens, the setting of multi-disc non-spherical lens
There can be preferable aberration correction ability to image strip, especially big visual field, improve the resolving power of lens assembly, and
The usage quantity that spherical lens in lens assembly can be reduced by the setting of non-spherical lens, simplifies the knot of lens assembly
Structure；In addition, being provided at least one spherical lens, spherical lens and non-spherical lens phase between every group of two non-spherical lenses
Between be arranged, the imaging aberration of light beam can be carried out complementary, image strip is corrected in time, further increases lens assembly
Aberration correction ability and resolving power, and then the imaging effect of high quality can be obtained
It should be understood that above general description and following detailed description is merely exemplary, this can not be limited
It is open.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and consistent with the instructions for explaining the principles of this disclosure.
Fig. 1 is a kind of schematic diagram of the lens assembly shown according to embodiments of the present invention；
Fig. 2 is the schematic diagram of another lens assembly shown according to embodiments of the present invention；
Fig. 3 is a kind of schematic diagram of the lens assembly imaging effect shown according to embodiments of the present invention；
Fig. 4 is a kind of schematic diagram of the light path of the lens imaging system imaging shown according to embodiments of the present invention.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended
The consistent example of some aspects be described in detail in claims, the disclosure.
Embodiment one
Fig. 1 is a kind of schematic diagram of lens assembly shown according to an exemplary embodiment, as shown in Figure 1, lens assembly
Direction along image strip incidence includes successively：First lens group 110, the second lens group 120.
First lens group 110, the second lens group 120 are in same optical axis 101；
And lens assembly further includes aperture diaphragm（It is not shown in figure）, it is set to the first lens group 110 and the second lens
Between group 120, the emergent ray in the boundary line that aperture diaphragm is grouped as two lens, the first lens group 110 passes through aperture diaphragm
It is incident on the second lens group 120.In optical system, aperture diaphragm is used to limit the thang-kng amount of lens assembly so that image light
The thang-kng amount of beam be limited in most beneficial for imaging the case where it is interior, to improve the effect of imaging.
Wherein, the first lens group 110 include at least one spherical lens and the first non-spherical lens, it is second aspherical
Mirror, at least provided with a spherical lens between two non-spherical lenses.
Second lens group 120 include at least one spherical lens and third non-spherical lens, the 4th non-spherical lens, two
At least provided with a spherical lens between non-spherical lens.
In a specific implementation, the first non-spherical lens can be a meniscus, and the second non-spherical lens can be one
Biconvex lens.
And third non-spherical lens can be a concave-convex lens, the 4th non-spherical lens can be a pair of concavees lens.
In said lens group, it is provided with four non-spherical lenses altogether, wherein the first non-spherical lens and the 4th aspherical
Lens are for improving coma, astigmatism；Second non-spherical lens and third non-spherical lens are used to improve the resolution ratio of big visual field, from
And be conducive to the correction to Off-axis aberrations, improve the resolving power of lens assembly.
In inventive embodiments, lens assembly, the first lens group 110, the equivalent focal length length of the second lens group 120 are respectively
F1, F2, F3, wherein F1, F2, F3 meet：
5 < F2/F1 <9,
7< F3/F1 < 100。
The focal length for the lens assembly that 110 and second lens group 120 of above-mentioned first lens group is constituted is relatively short.And first is saturating
The lens assembly of microscope group 110 and the second lens group 120 composition has positive diopter, to receive the incidence of image strip, into
Row optical imagery.
To sum up, the first lens group 110 and the second lens group 120 include two non-spherical lenses and to be set to each two non-
The setting of at least one spherical lens between spherical lens, multi-disc non-spherical lens can especially regard image strip greatly
There is preferable aberration correction ability in field, improves the resolving power of lens assembly, and can subtract by the setting of non-spherical lens
The usage quantity of spherical lens, simplifies the structure of lens assembly, and shorten the focal length of lens assembly in few lens assembly；Separately
Outside, it is provided at least one spherical lens between every group of two non-spherical lenses, spherical lens and non-spherical lens is alternate sets
It sets, complementation can be carried out to the imaging aberration of light beam, image strip is corrected in time, further increases the picture of lens assembly
Poor correction ability and resolving power, and then the imaging effect of high quality can be obtained.
Embodiment two,
The embodiment of the present invention two gives the example of another lens assembly based on embodiment one, specifically as shown in Fig. 2, camera lens
Component includes successively along the direction of light beam incidence：First lens group 210, the second lens group 220.
First lens group 210, the second lens group 220 are in same optical axis 201.
First lens group 210 include at least one spherical lens and two non-spherical lenses, two of the first lens group 210
At least one spherical lens is provided between non-spherical lens；When image strip the first lens group 210 of directive, the first lens group
210 correction image strips, and by the second lens group of image strip directive 220 after correction；
Second lens group 220 includes at least one spherical lens and two non-spherical lenses, and two of the second lens group are non-
At least one spherical lens is provided between spherical lens；When image strip the second lens group 220 of directive, the second lens group
220 for correcting image strip, and image strip is exported to next optical component and is imaged.
In inventive embodiments, lens assembly, the first lens group 210, the equivalent focal length length of the second lens group 220 are respectively
F1, F2, F3, wherein F1, F2, F3 meet：
5 < F2/F1 <9,
7< F3/F1 < 100。
Pass through the limitation to above-mentioned equivalent focal length so that it cooperates between the first lens group 210, the second lens group 220,
It can achieve the effect that improve lens assembly is imaged correction ability to image strip, and entire lens assembly focal length is shorter.
Specifically, referring to Fig. 2, along the direction of light beam incidence, the first lens group 210 includes the first non-spherical lens successively
211 and second non-spherical lens 212, the first non-spherical lens 211 and the second non-spherical lens 212 be in same with lens assembly
Optical axis 201.
In a specific implementation, along light beam incident direction, the first lens group 210 includes that the first spherical lens 213, first is non-
Spherical lens 211, the second spherical lens 214, third spherical lens 215, the 4th spherical lens 216 and the second non-spherical lens
212, the diopters of above-mentioned six lens is followed successively by negative, negative, negative, positive, positive and negative.
Alternatively, in another specific implementation, the position of the first non-spherical lens 211 and the first spherical lens can be interchanged,
I.e. along light beam incident direction, the first lens group 210 includes the first non-spherical lens 211, the first spherical lens 213, the second spherical surface
Lens 214, third spherical lens 215, the 4th spherical lens 216 and the second non-spherical lens 212, above-mentioned six lens are bent
Luminosity is followed successively by negative, negative, negative, positive, positive and negative, and the lens in the first lens group 210 are in same optical axis.
And the direction along light beam incidence, the second lens group 220 include third non-spherical lens 221 and the 4th successively
Non-spherical lens 222, third non-spherical lens 221 and the 4th non-spherical lens 222 are in same optical axis 201 with lens assembly.
In a specific implementation, along light beam incident direction, the second lens group 220 include successively third non-spherical lens 221,
5th spherical lens 223, the 6th spherical lens 224, the 7th spherical lens 225, the 8th spherical lens 226, the 9th spherical lens
227, the tenth spherical lens 228, the 11st spherical lens 229 and the 4th non-spherical lens 222, the dioptric of above-mentioned nine lens
Degree be followed successively by just, it is positive and negative, negative, positive, negative, positive, negative, positive, the lens in the second lens group 220 are in same optical axis.
To which the lens assembly of the first lens group 210 and the second lens group 220 composition has positive diopter, and receives
The incidence of image strip, thus allows for optical imagery.
For non-spherical lens, the first non-spherical lens 211, the second non-spherical lens 212, third non-spherical lens are influenced
221 and the 4th non-spherical lens 222 imaging factors have aspherical equation higher order coefficient order, the song of non-spherical lens
The diopter of rate, the circular cone coefficient of non-spherical lens and non-spherical lens.
The order of the higher order coefficient of aspherical equation influences edge analytic ability of the non-spherical lens to imaging, when aspherical
When the order of the higher order coefficient of equation is higher, the shape that the curved surface of aspherical equation includes is more complicated, to the light of image strip
Correction ability it is better.
Curvature refers to the inverse of the spherical radius of the close key light shaft portion of non-spherical lens.The present embodiment only to curvature just
Negative to be limited, the curvature for giving tacit consent to the reverse optical path direction in convex surface of non-spherical lens is just.
Circular cone coefficient influences the shape of the curved surface of the dipped beam axis of non-spherical lens, when the circular cone coefficient of non-spherical lens is zero
When, the shape of the curved surface of the dipped beam axis of non-spherical lens is circle, is mainly used for correcting the coma of image strip rim ray.Such as
The selection of fruit circular cone coefficient is improper, and light beam deflection can be caused improper, lead to image blur problem.
Diopter influences non-spherical lens to the degree of deflection of light, and the bigger non-spherical lens of diopter is to image strip
Degree of deflection is bigger, is mainly used for correcting coma of the image strip far from key light shaft portion.Acquiescence is shaped like the convex of non-spherical lens
The diopter of lens is just that the diopter of the concavees lens shaped like non-spherical lens is negative.
Specifically, the first non-spherical lens 211, the second non-spherical lens 212, third non-spherical lens 221 and the 4th are non-
Order, curvature, circular cone coefficient and the diopter of the higher order coefficient of the aspherical equation of spherical lens 222 meet respectively to be wanted as follows
It asks：
The order of the higher order coefficient of the aspherical equation of first non-spherical lens 211 is greater than or equal to preset first threshold value；
The order of the higher order coefficient of the aspherical equation of second non-spherical lens 212 is greater than or equal to default second threshold, non-due to working as
When the order of the higher order coefficient of spherical equation is higher, the shape that the curved surface of aspherical equation includes is more complicated, to image strip
The correction ability of light is better, but manufactures also more difficult, and cost is higher, in order to not influence the correction to image strip,
Not to causing big difficulty, the order of the higher order coefficient of aspherical equation that can be determined according to actual conditions.Or
Preset first threshold value and default second threshold can be configured in conjunction with the other configurations situation of lens assembly, preset first threshold value
Default second threshold can be equal to, for example, the high level for the non-spherical lens that lens assembly includes in embodiments of the present invention
Several orders is greater than or equal to 10, for example, preset first threshold value and default second threshold are 10, alternatively, preset first threshold value
It is 12 for 10 and default second threshold.
Optionally, the curvature in two faces that the first non-spherical lens 211 includes is contrary sign, to reduce incident image strip
Incident angle.For the first non-spherical lens 211, the face of image strip incidence is convex surface, and exit facet is concave surface, for correcting
The angle of paraxial rays.The curvature in two faces of the second non-spherical lens 212 is jack per line, while second non-spherical lens 212
Two faces are convex surface, for correcting spherical aberration and coma, to improve correction ability of the lens assembly to image strip.
Optionally, the circular cone coefficient of the first non-spherical lens 211 is not equal to 0, the circular cone coefficient of the second non-spherical lens 212
Equal to 0.
Optionally, the diopter of the first non-spherical lens 211 is negative, and the diopter of the second non-spherical lens 212 is negative.And
And with the positive and negative cooperation of the diopter of other four spherical lenses, correct light beam of the image strip far from primary optical axis, to reach
Aberration of the correction far from key light shaft portion.
Optionally, the order of the higher order coefficient of the aspherical equation of third non-spherical lens 221 is greater than or equal to default the
The order of three threshold values, the higher order coefficient of the aspherical equation of the 4th non-spherical lens 222 is greater than or equal to default 4th threshold value, by
In when the order of the higher order coefficient of aspherical equation is higher, the shape that the curved surface of aspherical equation includes is more complicated, to image
The correction ability of the light of light beam is better, but manufacture is also more difficult, and cost is higher, is rectified in order to not influence to image strip
Just, also not to causing big difficulty, the order of the higher order coefficient of aspherical equation that can be determined according to actual conditions.
Or default third threshold value and default 4th threshold value can be configured in conjunction with the other configurations situation of lens assembly, preset third
Threshold value can be equal to default 4th threshold value, for example, default third threshold value and default 4th threshold value are 10, alternatively, default third
Threshold value is 13 and default 4th threshold value equal 14；
Optionally, the curvature in two faces of third non-spherical lens 221 is jack per line, for third non-spherical lens 221, shadow
As light beam incidence face be concave surface, another side is convex surface, mainly corrects aberration, the song in two faces of the 4th non-spherical lens 222
Rate is contrary sign, while two faces of the 4th non-spherical lens 222 are concave surface, mainly corrects Off-axis aberrations, picture distortion；
Optionally, the circular cone coefficient of third non-spherical lens 221 is equal to 0, the circular cone coefficient etc. of the 4th non-spherical lens 222
In 0；
Optionally, the diopter of third non-spherical lens 221 is that just, the diopter of the 4th non-spherical lens 222 is just.And
And with the positive and negative cooperation of the diopter of other four spherical lenses, correct light beam of the image strip far from primary optical axis, to reach
Aberration of the correction far from key light shaft portion.
In addition, preset first threshold value, default second threshold, default third threshold value and default 4th threshold value can be same
Default value, or different numerical value.
Due to non-spherical lens compared with spherical lens compared to there is better curvature, aspheric and lens are from lens centre to edge
Continual curvature changes so that light converges to same point, substantially eliminates spherical aberration caused by spherical lens.So the
One non-spherical lens 211, the second non-spherical lens 212, third non-spherical lens 221 and the 4th non-spherical lens 222 can be big
The big image quality for improving lens assembly.Specifically, the first non-spherical lens 211 and the 4th non-spherical lens 222 for reducing
Coma and astigmatism, the second non-spherical lens 212 and third non-spherical lens 221 are for improving big visual field resolution ratio.
In addition, for non-spherical lens, it is stronger to the correction ability of aberration when the thickness of non-spherical lens is thicker.But
It is to consider to combine the thickness of selection non-spherical lens the problems such as manufacture difficulty and production cost in practical applications so that selection
Non-spherical lens have good aberration correction ability, manufacture difficulty will not be caused big, the problems such as production cost is big.Than
Such as, the thickness of third non-spherical lens 221 is T, meets range 6mm<T<12.5mm.
And if most lens all select non-spherical lens in lens assembly, lens assembly can be greatly increased
Manufacturing cost, therefore, under the premise of not influencing imaging, it is spherical lens that can also select part lens, to reduce manufacture
Cost.
It optionally, can also be by the first non-spherical lens 211 under the premise of being influenced less on lens assembly imaging effect
It is set as spherical lens.
Non-spherical lens included by 210 and second lens group 220 of above-mentioned first lens group and in the combination of spherical lens,
The position of non-spherical lens is other aspherical other than the first non-spherical lens 211 can be exchanged with adjacent spherical lens
Lens position can not preferably be exchanged.Above-mentioned spherical lens and non-spherical lens cooperate, and image strip are corrected jointly, to reach
To the effect for improving imaging effect.
In a specific implementation, third spherical lens 215 and the 4th spherical lens 216 it is glued be an entirety, obtain the
One veneer, the refractive index of third spherical lens 215 are more than the refractive index of the 4th spherical lens 216, third spherical lens 215
Abbe number is less than the Abbe number of the 4th spherical lens 216.Wherein, refractive index is used to indicate the extent of refraction of lens on light line, when
When refractive index is bigger, extent of refraction is bigger, therefore, is got over to the light splitting of image strip effect during lens assembly is imaged
Greatly.Wherein, Abbe number is for indicating degree of dispersion of the lens medium to light, and Abbe number is lower, and dispersion is more severe, to refractive index
It is bigger.
And it is optional, the 6th spherical lens 224 and 225 gluing of the 7th spherical lens are an entirety, obtain the second glue
Zoarium, the refractive index of the 6th spherical lens 224 are less than the refractive index of the 7th spherical lens 225, the Abbe of the 6th spherical lens 224
Abbe number of the number less than the 7th spherical lens 225.
And it is optional, the 8th spherical lens 226 and 227 gluing of the 9th spherical lens are an entirety, obtain third glue
Zoarium, the refractive index of the 8th spherical lens 226 are more than the refractive index of the 9th spherical lens 227, the Abbe of the 8th spherical lens 226
Abbe number of the number more than the 9th spherical lens 227.
The first veneer in the example above, the second veneer and third veneer, the difference for improving lens assembly
The spherical aberration of spectrum, and the axial chromatic aberration of lens assembly, axial chromatic aberration of hanging down are corrected.It is each included by each veneer
Mirror is made of the material of different Abbe numbers, and there are different dispersions to different spectrum for the material of different Abbe numbers, and by with
Curvature match reaches the function of correction aberration.
And optional, the first non-spherical lens 211, the second non-spherical lens 212, third non-spherical lens 221 and the
Four non-spherical lenses 222 are axisymmetric aspheric surface lens, due to the regular shape of axisymmetric aspheric surface lens, system easy to process
It makes, so when the first non-spherical lens 211, the second non-spherical lens 212, third non-spherical lens 221 and the 4th are aspherical
It is easy to process when mirror 222 is axisymmetric aspheric surface lens, reduce production cost.
And lens assembly further includes aperture diaphragm（It is not shown in figure）, aperture diaphragm is located at the first lens group 210 and
Between two lens groups 220, specifically, between the second non-spherical lens 212 and third non-spherical lens 221.Aperture diaphragm
It is in same optical axis with lens assembly, the thang-kng amount for limiting lens assembly so that the thang-kng amount of image strip is limited in most
The case where being conducive to imaging is interior, to improve the effect of imaging.
Using the lens assembly of the embodiment of the present invention, the purpose of preferable aberration correction is can reach, to which image quality is good,
Referring to Fig. 3, Fig. 3 be according to an exemplary embodiment shown in a kind of lens assembly imaging schematic diagram.As shown in figure 3, Fig. 3
Middle cross spider（+）For pre-imaging position, cross（x）For actual imaging position, then cross is got over cross spider intersection point registration in Fig. 3
Height illustrates that unobvious are got in the distortion of imaging.From the figure 3, it may be seen that imaging cross and cross spider intersection point registration are higher, and therefore, lens group
The degree of distortion of the imaging of part is relatively low, i.e., aberration is corrected, and is capable of providing the imaging effect of high quality.
Lens assembly provided in an embodiment of the present invention can be applied in ultra-short focus projection lens, by said lens group and
Throw light schematic diagram as shown in Figure 4 is realized in the setting of lens combination, wherein 410 be the first lens group, 420 is saturating for second
Microscope group, 401 be optical axis, is combined by said lens, short focus may be implemented, and the light fold-down after projection is mapped to and is reached
Reflection component（It is not shown in figure）, and reflex to projection screen upwards through reflection component and finally enter human eye, it is ultrashort to realize
Out-of-focus projection.
When applied to it is ultrashort compared with projection lens when, by preferable aberration correction ability, and coordinate reflection component, can reach
Resolution ratio up to 93 lines it is right/millimeter, effective focal length is -3.38 or -3.47, offset 142%-150%, and projection image size is
80-120 cuns.
And since there is this lens assembly preferable aberration correction ability, analytic ability to be promoted, height can also be applied to
In the projection lens of resolution, for example it can be used for parsing the image of 4K resolution ratio so that more high definition can be presented in projection screen
Image, promoted user experience.
In addition, lens assembly can also include other lenses group, it is more to be carried out to image strip by more lens groups
Secondary correction is projected out clearer imaging, but the volume of lens assembly and cost also can accordingly increase, and also brings along
The complexity of optical path adjusting.Two lens group frameworks provided in an embodiment of the present invention are succinct, and number of lenses is few, and by being provided with
The non-spherical lens and spherical lens for limiting quantity can reach preferable aberration correction effect.
In conclusion the lens assembly provided in the embodiment of the present invention is saturating including the first lens group, the second lens group two
Microscope group, the first lens group and the second lens group include two non-spherical lenses, and non-spherical lens has very well to image strip
Correction ability, especially to big visual-field beam have preferable aberration correction ability, improve the resolving power of lens assembly,
Therefore, on the one hand the setting of above-mentioned non-spherical lens reduces the quantity for the spherical lens that lens assembly includes, simplifies mirror
The structure of head assembly, and the focal length of entire lens assembly is shorter, can be applied to short focus projection and the projection of high-res camera lens
In.
By being provided with multiple spherical lenses between each two non-spherical lens, pass through spherical lens and non-spherical lens
Alternate setting can carry out the imaging aberration of image strip complementary so that image strip is corrected in time, is further reached
Improve the effect of lens assembly aberration correction ability and resolving power.
Projection lens disclosed by the embodiments of the present invention includes that there are two lens groups, and optics architecture design is succinct, is convenient for
Optical system is adjusted, and adjusts error and assembly error is smaller.
The embodiment of the present invention can be applied in ultra-short focus projection lens, and can be applied in high-res lens design.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and includes the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the accompanying claims.
Claims (9)
1. a kind of lens assembly, which is characterized in that the direction along light beam incidence includes successively：First lens group, the second lens
Group,
Wherein, first lens group includes first non-spherical lens, the first spherical surface successively along the direction of light beam incidence
Lens, the second spherical lens, third spherical lens, the 4th spherical lens and second non-spherical lens, said lens are bent
Luminosity is followed successively by negative, negative, negative, positive, positive and negative；
Alternatively, including first spherical lens, first non-spherical lens, second spherical lens, the third ball
Face lens, the 4th spherical lens and second non-spherical lens, the diopters of said lens be followed successively by it is negative, negative, negative,
Just, positive and negative；
Second lens group along light beam incidence direction successively include the third non-spherical lens, the 5th spherical lens,
6th spherical lens, the 7th spherical lens, the 8th spherical lens, the 9th spherical lens, the tenth spherical lens, the 11st spherical surface are saturating
Mirror and the 4th non-spherical lens, the diopters of said lens be followed successively by just, it is positive and negative, negative, positive, negative, positive, negative, positive；
The lens assembly has positive diopter.
2. lens assembly according to claim 1, which is characterized in that
First non-spherical lens is a meniscus, and second non-spherical lens is a biconvex lens, and/or,
The third non-spherical lens is a concave-convex lens, and the 4th non-spherical lens is a biconcave lens.
3. lens assembly according to claim 1, which is characterized in that
Lens in first lens group are in same optical axis.
4. lens assembly according to claim 1 or 3, which is characterized in that
Lens in second lens group are in same optical axis.
5. lens assembly according to claim 1, which is characterized in that the aspherical equation of first non-spherical lens
The order of higher order coefficient is greater than or equal to preset first threshold value, the higher order coefficient of the aspherical equation of second non-spherical lens
Order be greater than or equal to default second threshold；
And the order of the higher order coefficient of the aspherical equation of the third non-spherical lens is greater than or equal to default third threshold
The order of value, the higher order coefficient of the aspherical equation of the 4th non-spherical lens is greater than or equal to default 4th threshold value.
6. lens assembly according to claim 3, which is characterized in that the third, the 4th spherical lens gluing are one
Whole, the refractive index of the third spherical lens is more than the 4th spherical lens.
7. lens assembly according to claim 4, which is characterized in that the six, the 7th spherical lens gluing is one
Whole, the refractive index of the 6th spherical lens is less than the 7th spherical lens；
And the eight, the 9th spherical lens gluing is an entirety, the refractive index of the 8th spherical lens is more than the 9th
Spherical lens.
8. lens assembly according to claim 1, which is characterized in that the thickness of the third non-spherical lens is T, is met
6mm<T<12.5mm。
9. lens assembly according to claim 5, which is characterized in that first predetermined threshold value, the second predetermined threshold value,
Three predetermined threshold values, the 4th predetermined threshold value are the integer more than or equal to 10.
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| CN201610677450.3A CN106094179B (en) | 2016-08-17 | 2016-08-17 | A kind of lens assembly |
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| CN201610677450.3A CN106094179B (en) | 2016-08-17 | 2016-08-17 | A kind of lens assembly |
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| CN106094179A CN106094179A (en) | 2016-11-09 |
| CN106094179B true CN106094179B (en) | 2018-11-09 |
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| CN101482689A (en) * | 2009-02-12 | 2009-07-15 | 复旦大学 | Ultra-thin back projection optical system |
| JP6221266B2 (en) * | 2013-03-04 | 2017-11-01 | 株式会社リコー | Projection optical system and image display device |
| CN104698574B (en) * | 2013-12-05 | 2017-11-24 | 台达电子工业股份有限公司 | Wide-angle projection optical system |
| CN105759543A (en) * | 2014-12-17 | 2016-07-13 | 深圳市亿思达科技集团有限公司 | Projection optical system and projection device |
| CN105158884B (en) * | 2015-10-10 | 2018-03-23 | 浙江大学 | A kind of ultrashort out-of-focus projection's lens system |
| CN105785557B (en) * | 2016-03-10 | 2018-05-01 | 浙江水晶光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's object lens |
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Effective date of registration: 20200821 Address after: 266555 Qian WAN port road, Huangdao District, Qingdao, Shandong Province, No. 218 Patentee after: Qingdao Hisense Laser Display Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE Co.,Ltd. |