CN209044168U - A kind of projection lens - Google Patents
A kind of projection lens Download PDFInfo
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- CN209044168U CN209044168U CN201821788224.3U CN201821788224U CN209044168U CN 209044168 U CN209044168 U CN 209044168U CN 201821788224 U CN201821788224 U CN 201821788224U CN 209044168 U CN209044168 U CN 209044168U
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Abstract
The utility model relates to a kind of projection lens, successively include: the first lens group, the second lens group, the third lens group, prism from object end to imaging surface along its optical axis direction；First lens group has negative power；Second lens group has positive light coke；The third lens group has positive light coke.The utility model takes the photograph remote structure using counter, so that camera lens has larger field and longer rear coke.First lens group uses negative power energy active balance off-axis aberration, and aperture ST is placed between the second lens group G2 and the third lens group G3, so that whole lens construction is symmetrical relative to aperture ST, it can preferably school coma, astigmatism, chromatic longitudiinal aberration, distortion etc..Second lens use aspheric design, can substantially improve the flat field of camera lens, effectively promote camera lens and parse power, meanwhile, it is aspherical only with 1, it avoids increasing difficulty to adjustment.The effect of the prism is transferred to light, and optical-mechanical system is facilitated to be laid out.
Description
Technical field
The utility model relates to projection arts, more particularly to a kind of projection lens.
Background technique
Triniscope projection arrangement (CRT) is gradually projected by liquid crystal projection apparatus (LCD), digital light processing in recent years
Replaced the more light and short projection arrangements such as device (DLP).Since the CRT projector epoch, bulb source is exactly projector
Main force's light source, although shadow casting technique is changing always, CRT gradually upgrades to LCD and DLP shadow casting technique, light source
But there is no so rapidly for variation.Several years up to date, the new light sources such as laser light source were increasingly becoming leading role.
However, current projector lens are affected by visible light variation, decrease is imaged in telephoto lens at a distance
Problem is never well solved, and short-focus lens high definition picture imaging effect is poor.
Utility model content
Based on this, it is necessary to be improved for projection lens in the prior art, providing a kind of has high-resolution, big
Displacement, it is small distortion, no color differnece projection lens.
The utility model adopts the following technical solution realizes above-mentioned purpose of utility model:
A kind of projection lens successively includes: the first lens group, the second lens from object end to imaging surface along its optical axis direction
Group, the third lens group, prism；
First lens group has negative power；
Second lens group described in first lens group successively includes first saturating from object end to imaging surface along its optical axis direction
Mirror and the second lens, the first lens are spherical lens, and the second lens are non-spherical lens；
First lens include the first lens front surface towards object end and the first lens rear surface towards imaging surface；
Second lens include the second lens front surface towards object end and the second lens rear surface towards imaging surface；Wherein, institute
It states the first lens front surface and the second lens front surface is convex surface, the first lens rear surface and the second lens rear surface are concave surface.
Second lens group has positive light coke；
Second lens group successively includes the third lens and the 4th lens from object end to imaging surface along its optical axis direction；The
Three lens are balsaming lens, and the 4th lens are simple lens；
The third lens include: the third lens front surface towards object end, the first cemented surface positioned at middle part, towards imaging surface
The third lens rear surface；4th lens include: the 4th lens front surface towards object end, towards after the 4th lens of imaging surface
Surface；Wherein, the third lens front surface, the 4th lens front surface and the 4th lens rear surface are convex surface, the third lens rear surface
For concave surface.Table after the third lens front surface, the first cemented surface, the third lens rear surface, the 4th lens front surface and the 4th lens
Face is spherical surface.
The third lens group has positive light coke；
The third lens group sequentially includes aperture, the 5th lens, the 6th lens, from object end to imaging surface along its optical axis direction
Seven lens and the 8th lens；5th lens and the 6th lens are balsaming lens, and the 7th lens and the 8th lens are simple lens；
5th lens include the 5th lens front surface towards object end, the second cemented surface positioned at middle part and towards imaging surface
The 5th lens rear surface；6th lens include the 6th lens front surface towards object end, the third cemented surface positioned at middle part and
Towards the 6th lens rear surface of imaging surface；7th lens include towards the 7th lens front surface at object end and towards imaging surface
7th lens rear surface；8th lens include towards the 8th lens front surface at object end and towards table after the 8th lens of imaging surface
Face.Wherein, the 5th lens front surface, the 5th lens rear surface, the 6th lens rear surface, the 7th lens front surface, the 7th lens
Table is convex surface after rear surface, the 8th lens front surface and the 8th lens；6th lens front surface is concave surface；Table before 5th lens
Face, the second cemented surface, the 5th lens rear surface, the 6th lens front surface, third cemented surface, the 6th lens rear surface, the 7th are thoroughly
Mirror front surface, the 7th lens rear surface, the 8th lens front surface and the 8th lens rear surface are spherical surface.
The projection lens satisfies the following conditional expression:
(1) 16 < TT/f < 24,
(2) 2 < BFL/f,
Wherein, TT is projection lens overall length, and f is projection lens focal length, and BFL is projection lens back focal length, i.e., from described the
The last one lens of three lens groups to imaging surface distance.
Meet the projection lens of above-mentioned condition, while having the characteristics that high-resolution, big displacement, small distortion, no color differnece.
Further, the projection lens also satisfies the following conditional expression:
(3)-0.5<f1/f3<-0.8
Wherein, f1 is the focal length of first lens group, and f3 is the focal length of the third lens group.
Conditional (3) can ensure to control simultaneously telecentric system and meet the requirement of wide viewing angle.
Further, the projection lens also satisfies the following conditional expression:
(4)1.5<f2/f3<2.5
Wherein, f2 is the focal length of second lens group.
Conditional (4) ensures that the projection lens keeps the focal power distribution of negative and positive just, and makes the second lens group G2
With
Aberration produced by the third lens group G3 can mutually balance each other.
The projection lens of the utility model has following advantageous effects:
(1) the utility model takes the photograph remote structure using counter, so that camera lens has larger field and longer rear coke.First lens
Group uses negative power energy active balance off-axis aberration, and aperture ST is placed between the second lens group G2 and the third lens group G3, makes
It is symmetrical relative to aperture ST to obtain whole lens construction, it can preferably school coma, astigmatism, chromatic longitudiinal aberration, distortion etc..
(2) second lens use aspheric design, can substantially improve the flat field of camera lens, effectively promote camera lens and parse power,
Meanwhile it is aspherical only with 1, it avoids increasing difficulty to adjustment.The effect of the prism is transferred to light, and ray machine is facilitated
System layout.
Explanation of nouns:
Focal power (focal power) is equal to the difference of image space light beam convergence and object space light beam convergence, it characterizes optics
The ability of system deviation light, the common letter of focal powerIt indicates.Focal power characterizes optical system to the flexion of incoming parallel beam
Ability.Numerical value it is bigger, collimated light beam is rolled over more severe；When, flexion is convergent；When, flexion is diversity
's.When, correspond to, as plane refraction.
Balsaming lens (cemented doublet) is by lens obtained lens glued together.This group with two lens forming
Close the effective ways that lens are a kind of acquirement short focus long, big magnifying power and preferable image quality.Balsaming lens is for greatest extent
It reduces color difference or eliminates color difference in ground.Compared with single element lens, achromatic lens is capable of forming smaller luminous point.
Simple lens refers to the lens being only made of one block of optical glass, including plano-convex lens, plano-concave lens, biconvex lens,
Biconcave lens, crescent lens etc..
Prism is a kind of transparent substance by intersecting two-by-two but plane not parallel each other surrounds, to be divided or make light
Shu Fasheng dispersion.Prism is the polyhedron that transparent material (such as glass, crystal) is made into.
Spherical lens, which refers to, has constant curvature from the center of lens to edge.
Non-spherical lens is then that the continual curvature from center heart the to edge changes.Non-spherical lens, radius of curvature with
Central axis and change, to improve optical quality, reduce optical element, reduce design cost.
Detailed description of the invention
The structural schematic diagram of the projection lens of Fig. 1 system the preferred embodiment of the utility model.
The curvature of field figure of the projection lens of Fig. 2 system the utility model embodiment.
The distortion figure of the projection lens of Fig. 3 system the utility model embodiment.
The chromaticity difference diagram of the projection lens of Fig. 4 system the utility model embodiment.
Main element symbol description
| First lens group | G1 |
| First lens | L1 |
| Second lens | L2 |
| First lens front surface | L1S1 |
| First lens rear surface | L1S2 |
| Second lens front surface | L2S1 |
| Second lens rear surface | L2S2 |
| Second lens group | G2 |
| The third lens | L3 |
| 4th lens | L4 |
| The third lens front surface | L3S1 |
| First cemented surface | L3S2 |
| The third lens rear surface | L3S3 |
| 4th lens front surface | L4S1 |
| 4th lens rear surface | L4S2 |
| The third lens group | G3 |
| Aperture | ST |
| 5th lens | L5 |
| 6th lens | L6 |
| 7th lens | L7 |
| 8th lens | L8 |
| 5th lens front surface | L5S1 |
| Second cemented surface | L5S2 |
| 5th lens rear surface | L5S3 |
| 6th lens front surface | L6S1 |
| Third cemented surface | L6S2 |
| 6th lens rear surface | L6S3 |
| 7th lens front surface | L7S1 |
| 7th lens rear surface | L7S2 |
| 8th lens front surface | L7S1 |
| 8th lens rear surface | L8S2 |
| Prism | G4 |
| Imaging surface | G5 |
The following detailed description will be further explained with reference to the above drawings the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, by the following examples, it and ties
Attached drawing is closed, the packaging bag of the utility model is further elaborated.It should be appreciated that specific embodiment described herein
Only to explain the utility model, it is not used to limit the utility model.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element is referred to as " directly existing " another element "upper",
There is no intermediary elements.Term as used herein "vertical", "horizontal", "left" and "right" and similar statement are
For illustrative purposes.
Below in conjunction with attached drawing, the utility model is described in further detail.
Referring to Fig. 1, a kind of projection lens provided for the utility model embodiment, along its optical axis direction from object end to
Imaging surface G5 sequentially includes: a first lens group G1 with negative power, second lens group with positive light coke
G2, a third lens group G3 and a prism G4 with positive light coke.
In the present embodiment, which sequentially includes first saturating from object end to imaging surface along its optical axis direction
Mirror L1 and the second lens L2.The first lens L1 includes a first lens front surface L1S1 and a first lens rear surface
L1S2.The second lens L2 includes an a second lens front surface L2S1 and second lens rear surface L2S2.Wherein, first
Lens front surface L1S1 and the second lens front surface L1S2 is convex surface, the first lens rear surface L1S2 and the second lens rear surface
L2S2 is concave surface.First lens front surface L1S1 and the first lens rear surface L1S2 is spherical surface.Second lens front surface L1S2 and
Second lens rear surface L2S2 is aspherical.
In the present embodiment, which sequentially includes that third is saturating from object end to imaging surface along its optical axis direction
Mirror L3 and the 4th lens L4.The third lens L3 is a balsaming lens, including a third lens front surface L3S1, one first
A cemented surface L3S2 and the third lens rear surface L3S3.4th lens L4 include the 4th lens front surface L4S1 and
One the 4th lens rear surface L4S2.Wherein, after the third lens front surface L3S1, the 4th lens front surface L4S1 and the 4th lens
Surface L 4S2 is convex surface, and the third lens rear surface L3S2 is concave surface.The third lens front surface L3S1, the first cemented surface L3S2,
Three lens rear surface L3S3, the 4th lens front surface L4S1 and the 4th lens rear surface L4S2 are spherical surface.
In the present embodiment, which sequentially includes aperture from object end to imaging surface along its optical axis direction
ST, the 5th lens L5, the 6th lens L6, the 7th lens L7 and the 8th lens L8.5th lens L5 is balsaming lens, including one
A 5th lens front surface L5S1, a second cemented surface L5S2 and a 5th lens rear surface L5S3.6th lens L6
For balsaming lens, including a 6th lens front surface L6S1, a third cemented surface L6S2 and a 6th lens rear surface
L6S3.7th lens L7 includes a 7th lens front surface L7S1 and a 7th lens rear surface L7S2.8th thoroughly
Mirror L8 includes a 8th lens front surface L8S1 and a 8th lens rear surface L8S2.Wherein, the 5th lens front surface
L5S1, the 5th lens rear surface L5S3, the 6th lens rear surface L6S3, the 7th lens front surface L7S1, the 7th lens rear surface
L7S2, the 8th lens front surface L7S1 and the 8th lens rear surface L8S2 are convex surface.6th lens front surface L6S1 is concave surface.The
Five lens front surface L5S1, the second cemented surface L6S2, the 5th lens rear surface L5S3, the 6th lens front surface L6S1, third glue
Before conjunction face L6S2, the 6th lens rear surface L6S3, the 7th lens front surface L7S1, the 7th lens rear surface L7S2, the 8th lens
Surface L 7S1 and the 8th lens rear surface L8S2 is spherical surface.
The effect of prism G4 is transferred to light, and optical-mechanical system is facilitated to be laid out.
The utility model takes the photograph remote structure using counter, so that camera lens has larger field and longer rear coke.First lens group
Using negative power energy active balance off-axis aberration, aperture ST is placed between the second lens group G2 and the third lens group G3, so that
Whole lens construction is symmetrical relative to aperture 23, can preferably school coma, astigmatism, chromatic longitudiinal aberration, distortion etc..In addition, the second lens
L2 uses aspheric design, can substantially improve the flat field of camera lens, effectively promotes camera lens and parses power, meanwhile, only with 1 aspheric
Face avoids increasing difficulty to adjustment.
The projection lens meets following condition formulae:
(1)16<TT/f<24
(2)2<BFL/f
Wherein, TT is projection lens overall length, and f is projection lens focal length, and BFL is projection lens back focal length, i.e., from described the
The last one lens of three lens groups to imaging surface distance.
Conditional (1) limits the entire length of the projection lens, under the positive focal power collocation of negative and positive, ensure that mirror
Balance of the head overall length between aberration；
Conditional (2) ensures that optical-mechanical system has sufficient space that can be placed in the third lens group G3 between imaging surface G5.
Further, the projection lens also satisfies the following conditional expression:
(3)-0.5<f1/f3<-0.8
Wherein, the focal length of f1 first lens groups, the focal length of the f3 the third lens groups.
Conditional (3) can ensure to control simultaneously telecentric system and meet the requirement of wide viewing angle.
Further, the projection lens also satisfies the following conditional expression:
(4)1.5<f2/f3<2.5
Wherein, the focal length of f2 second lens groups.
Conditional (4) ensures that the projection lens keeps the focal power distribution of negative and positive just, and makes the second lens group G2
It can mutually balance each other with aberration produced by the third lens group G3.
Each optical module of projection lens provided by one embodiment of the utility model meets the condition of Tables 1 and 2.Its
In, R is the radius of curvature of the optical surface of each lens, D be distance on corresponding optical surface to the axis of the latter optical surface,
Nd is refractive index of the corresponding lens to d light (wavelength 587nm), and Vd is Abbe number of the d light in corresponding lens；K represents aspherical
Conic coefficient, A2 represent second order asphericity coefficient, and A4 represents quadravalence asphericity coefficient, and A6 represents six rank asphericity coefficients, A8
Represent eight rank asphericity coefficients.
Table 1
| Surface | Face type | R | D | Nd | Vd |
| L1S1 | Spherical surface | 5.08 | 0.53 | 1.80 | 46.57 |
| L1S2 | Spherical surface | 2.22 | 0.86 | ||
| L2S1 | It is aspherical | 3.04 | 0.35 | 1.59 | 29.91 |
| L2S2 | It is aspherical | 1.12 | 2.96 | ||
| L3S1 | Spherical surface | 19.08 | 0.74 | 1.60 | 38.01 |
| L3S2 | Spherical surface | -3.35 | 0.36 | 1.49 | 70.42 |
| L3S3 | Spherical surface | 3.35 | 0.51 | ||
| L4S1 | Spherical surface | 4.75 | 0.70 | 1.74 | 49.24 |
| L4S2 | Spherical surface | -7.27 | 3.04 | ||
| Stop | Plane | - | 0.72 | ||
| L5S1 | Spherical surface | 15.21 | 0.23 | 1.90 | 31.32 |
| L5S2 | Spherical surface | 2.04 | 0.56 | 1.49 | 70.42 |
| L5S3 | Spherical surface | -2.92 | 0.02 | ||
| L6S1 | Spherical surface | -75.37 | 0.75 | 1.50 | 81.59 |
| L6S2 | Spherical surface | -1.40 | 0.28 | 1.91 | 35.26 |
| L6S3 | Spherical surface | -14.09 | 0.03 | ||
| L7S1 | Spherical surface | 42.34 | 0.87 | 1.50 | 81.59 |
| L7S2 | Spherical surface | -2.09 | 0.02 | ||
| L8S1 | Spherical surface | 13.63 | 0.51 | 1.78 | 47.52 |
| L8S2 | Spherical surface | -5.64 |
Table 2
| Surface | K | A2 | A4 | A6 | A8 |
| L2S1 | -1.1 | 0 | -9.14E-03 | 2.72E-05 | 1.30E-05 |
| L2S2 | -0.88 | 0 | 2.34E-02 | -8.54E-03 | 1.58E-04 |
The curvature of field of the projection lens of present embodiment, distortion, spherical aberration are respectively as shown in Fig. 2 to Fig. 4.
In Fig. 2, curve T and S are respectively meridianal curvature of field characteristic curve and Sagittal field curvature characteristic curve.
In Fig. 3, curve is distortion performance curve.
In Fig. 4, the projection lens is respectively to be directed to F line (wavelength 486nm), d line (wavelength 587nm), C line (wave
A length of 656nm) and the aberration curve observed.
The projection lens of the utility model, by the limitation of aforementioned four formula, so that the projection lens has high score
The features such as resolution, short focus, to improve the image quality of the projection lens.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of projection lens, it is characterised in that: along its optical axis direction successively include: from object end to imaging surface the first lens group,
Second lens group, the third lens group, prism；
First lens group has negative power；Second lens group has positive light coke；The third lens group has
Positive light coke.
2. projection lens according to claim 1, it is characterised in that: the second lens group described in first lens group is along it
Optical axis direction successively includes the first lens and the second lens from object end to imaging surface, and the first lens are spherical lens, the second lens
For non-spherical lens.
3. projection lens according to claim 2, it is characterised in that:
First lens include the first lens front surface towards object end and the first lens rear surface towards imaging surface；
Second lens include the second lens front surface towards object end and the second lens rear surface towards imaging surface；
Wherein, first lens front surface and the second lens front surface are convex surface, after the first lens rear surface and the second lens
Surface is concave surface.
4. projection lens according to claim 1, it is characterised in that:
Second lens group successively includes the third lens and the 4th lens from object end to imaging surface along its optical axis direction；Third is saturating
Mirror is balsaming lens, and the 4th lens are simple lens.
5. projection lens according to claim 4, it is characterised in that:
The third lens include: the third lens front surface towards object end, the first cemented surface positioned at middle part, towards imaging surface
The third lens rear surface；
4th lens include: the 4th lens front surface towards object end, towards the 4th lens rear surface of imaging surface；
Wherein, the third lens front surface, the 4th lens front surface and the 4th lens rear surface are convex surface, and the third lens rear surface is
Concave surface；The third lens front surface, the first cemented surface, the third lens rear surface, the 4th lens front surface and the 4th lens rear surface
For spherical surface.
6. projection lens according to claim 1, it is characterised in that:
The third lens group along its optical axis direction sequentially include from object end to imaging surface aperture, the 5th lens, the 6th lens, the 7th thoroughly
Mirror and the 8th lens；5th lens and the 6th lens are balsaming lens, and the 7th lens and the 8th lens are simple lens.
7. projection lens according to claim 6, it is characterised in that:
5th lens include the 5th lens front surface towards object end, the second cemented surface positioned at middle part and towards imaging surface
Five lens rear surfaces；
6th lens include the 6th lens front surface towards object end, the third cemented surface positioned at middle part and towards imaging surface
Six lens rear surfaces；
7th lens include towards the 7th lens front surface at object end and towards the 7th lens rear surface of imaging surface；
8th lens include towards the 8th lens front surface at object end and towards the 8th lens rear surface of imaging surface；
Wherein, the 5th lens front surface, the 5th lens rear surface, the 6th lens rear surface, the 7th lens front surface, the 7th lens
Table is convex surface after rear surface, the 8th lens front surface and the 8th lens；6th lens front surface is concave surface；Table before 5th lens
Face, the second cemented surface, the 5th lens rear surface, the 6th lens front surface, third cemented surface, the 6th lens rear surface, the 7th are thoroughly
Mirror front surface, the 7th lens rear surface, the 8th lens front surface and the 8th lens rear surface are spherical surface.
8. projection lens according to claim 1-7, it is characterised in that: the projection lens meets the following conditions
Formula:
(1) 16 < TT/f < 24,
(2)2<BFL/f；
Wherein, TT is projection lens overall length, and f is projection lens focal length, and BFL is projection lens back focal length, i.e., saturating from the third
The last one lens of microscope group to imaging surface distance.
9. projection lens according to claim 1-7, it is characterised in that:
The projection lens also satisfies the following conditional expression: (3) -0.5 < f1/f3 < -0.8；
Wherein, f1 is the focal length of first lens group, and f3 is the focal length of the third lens group.
10. projection lens according to claim 1-7, it is characterised in that:
The projection lens also satisfies the following conditional expression: (4) 1.5 < f2/f3 < 2.5；
Wherein, f2 is the focal length of second lens group.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821788224.3U CN209044168U (en) | 2018-11-01 | 2018-11-01 | A kind of projection lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821788224.3U CN209044168U (en) | 2018-11-01 | 2018-11-01 | A kind of projection lens |
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| CN209044168U true CN209044168U (en) | 2019-06-28 |
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ID=67040437
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270668A (en) * | 2018-12-04 | 2019-01-25 | 深圳市大象投影显示技术有限责任公司 | Telecentricity projection lens and image output device |
| CN111123488A (en) * | 2018-11-01 | 2020-05-08 | 北京乐都展陈科技发展有限公司 | Projection lens |
| TWI823781B (en) * | 2019-08-30 | 2023-11-21 | 南韓商三星電機股份有限公司 | Optical imaging system and portable electronic device |
-
2018
- 2018-11-01 CN CN201821788224.3U patent/CN209044168U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123488A (en) * | 2018-11-01 | 2020-05-08 | 北京乐都展陈科技发展有限公司 | Projection lens |
| CN111123488B (en) * | 2018-11-01 | 2024-07-16 | 北京乐都展陈科技发展有限公司 | Projection lens |
| CN109270668A (en) * | 2018-12-04 | 2019-01-25 | 深圳市大象投影显示技术有限责任公司 | Telecentricity projection lens and image output device |
| TWI823781B (en) * | 2019-08-30 | 2023-11-21 | 南韓商三星電機股份有限公司 | Optical imaging system and portable electronic device |
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