CN108267846A - Projection lens and projection arrangement - Google Patents
Projection lens and projection arrangement Download PDFInfo
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- CN108267846A CN108267846A CN201810162090.2A CN201810162090A CN108267846A CN 108267846 A CN108267846 A CN 108267846A CN 201810162090 A CN201810162090 A CN 201810162090A CN 108267846 A CN108267846 A CN 108267846A
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- lens
- projection
- imaging unit
- screen
- projection arrangement
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Abstract
The present invention discloses a kind of projection lens and projection arrangement, and projection lens is applied on the image projecting of projection arrangement, and projection arrangement is used for projecting image to screen and comprising imaging unit, and projection lens includes the first lens group and the second lens group.First lens group is with negative diopter, the first lens group adjacent screen and with the first lens, and the first lens are with the first negative diopter.Second lens group has positive diopter, and for the second lens group adjacent to imaging unit and comprising the second lens, the second lens have the second negative diopter.The Abbe number of first lens is Vd1, the Abbe number of the second lens is Vd2, and 0.4≤Vd2/Vd1≤ 1.2, Vd1＜ 50, so as to effectively correcting image distortion and eliminating lateral chromatic aberration, also, the refractive power of second lens is more than first lens, the third lens, the 4th lens, and the 5th lens refractive power, further eliminate lateral chromatic aberration the effect of.
Description
This divisional application is based on application No. is 201510541269.5, and the applying date is on 08 28th, 2015, invention name
The referred to as divisional application of the Chinese patent application of " projection lens and projection arrangement ".
Technical field
It is espespecially a kind of that there is short focus projection the present invention relates to a kind of projection lens and the projection arrangement with the projection lens
The projection lens of function and the projection arrangement with the projection lens.
Background technology
With the development of science and technology projector is commonly used to show image data in meeting bulletin.In order to coordinate meeting room
Place size, the projection lens of ultrashort coke are increasingly becoming the market mainstream with the advantages of its easy to carry and focusing facility.Common
The design of short focus projection lens uses the configuration that two crowds of Zoom lens groups are formed with five eyeglasses, wherein relatively close projection screen
First lens group has negative diopter to be used for divergent rays, and the second lens group for being relatively distant from projection screen has positive dioptric
Degree is with convergent light rays, but this designs usually using higher-priced non-spherical lens to eliminate lateral chromatic aberration (Lateral Color
Aberration), therefore the manufacture cost of short focus projection lens is caused to remain high.
Therefore, it is necessary to a kind of novel projection lens and its projection arrangement are designed, to overcome drawbacks described above.
Invention content
The purpose of the present invention is to provide a kind of projection lens and its projection arrangement with short focus projecting function, effective
While correcting image distortion and eliminate lateral chromatic aberration, moreover it is possible to meet the price of product and volume production advantage.
In order to achieve the above objectives, the present invention provides a kind of projection lens, comprising：
Projection lens is applied on the image projecting of projection arrangement, which is used for projecting image to screen, and should
Projection arrangement includes imaging unit, which includes：
First lens group, has a negative diopter, and first lens group is adjacent to the screen and with the first lens, this is first thoroughly
Mirror has the first negative diopter；And
Second lens group has positive diopter, and second lens group is adjacent to the imaging unit and comprising the second lens, this
Two lens have the second negative diopter；
Wherein, the Abbe number of first lens is Vd1, the Abbe number of second lens is Vd2, and 0.4≤Vd2/Vd1≦
1.2, Vd1＜ 50.
Preferably, the refraction coefficient of second lens is more than or equal to 1.64 and less than or equal to 1.87, second lens Ah
Shellfish number is more than or equal to 20 and less than or equal to 35.
Preferably, second lens are made of dense flint glass material.
Preferably, second lens group is also comprising third lens, the 4th lens and the 5th lens, the third lens with
And the 4th lens be located between first lens and second lens, the 5th lens be located at the imaging unit and this
Between two lens, the distance of first lens to the third lens is d1, the distance of the 5th lens to the imaging unit is
dbf1, and dbf1/d1≤ 1, dbf1≧20mm。
Preferably, the 5th lens are non-spherical lens.
Preferably, second lens, the focal length of the third lens, the 4th lens and the 5th lens are all higher than this
The focal length of first lens.
Preferably, the focal length of first lens is f1, the focal lengths of second lens is f2, and 0.2 ≦ ∣ f2 ∣/∣ f1 ∣≤
0.5。
In order to achieve the above object, the present invention also provides a kind of projection arrangement, for projecting image to screen, the projection arrangement packet
Contain：
Light source, for providing light；
Imaging unit, for receiving the light；And
Projection lens is set between the imaging unit and the screen to be used for projecting the light to the screen, the projection
Camera lens includes：
First lens group, has a negative diopter, and first lens group is adjacent to the screen and with the first lens, this is first thoroughly
Mirror has the first negative diopter；And
Second lens group has positive diopter, and second lens group is adjacent to the imaging unit and comprising the second lens, this
Two lens have the second negative diopter；
Wherein, the Abbe number of first lens is Vd1, the Abbe number of second lens is Vd2, and 0.4≤Vd2/Vd1≦
1.2, Vd1＜ 50.
Preferably, the refraction coefficient of second lens is more than or equal to 1.64 and less than or equal to 1.87, second lens Ah
Shellfish number is more than or equal to 20 and less than or equal to 35.
Preferably, second lens are made of dense flint glass material.
Preferably, second lens group is also comprising third lens, the 4th lens and the 5th lens, the third lens with
And the 4th lens be located between first lens and second lens, the 5th lens be located at the imaging unit and this
Between two lens, the distance of first lens to the third lens is d1, the distance of the 5th lens to the imaging unit is
dbf1, and dbf1/d1≤ 1, dbf1≧20mm。
Preferably, the 5th lens are non-spherical lens.
Preferably, second lens, the focal length of the third lens, the 4th lens and the 5th lens are all higher than this
The focal length of first lens.
Preferably, the focal length of first lens is f1, the focal length of second lens is f2, and 0.2 ≦ ∣ f2∣/∣f1∣≦
0.5。
Compared with prior art, there are the first lens of negative diopter in the first lens group of the present invention using negative diopter
The lens of the second lens with including negative diopter in the second lens group of positive diopter are configured and the Ah using the first lens
Shellfish number Vd1Less than 50 and first lens Abbe number Vd1With the Abbe number V of the second lensd2Ratio value be 0.4 to 1.2 (i.e. 0.4
≦Vd2/Vd1≤ 1.2) design so can effectively correct image distortion and eliminate lateral chromatic aberration, be thrown so as to improve
The image quality of image device and the lens numbers for reducing projection lens, to meet the price of product and volume production advantage.
Description of the drawings
The schematic diagram for the projection arrangement that Fig. 1 is proposed by the embodiment of the present invention.
Fig. 2 is the structure diagram of the projection lens of Fig. 1.
Fig. 3 is the filed curvature of projection lens of Fig. 2 and image deformation simulation drawing.
Fig. 4 is the lateral chromatic aberration simulation drawing of the projection lens of Fig. 2.
Fig. 5 is the modulation transfer function simulation drawing of the projection lens of Fig. 2.
Specific embodiment
To make have further understanding to the purpose of the present invention, construction, feature and its function, hereby coordinate embodiment detailed
It is described as follows.
Some vocabulary has been used in specification and claims to censure specific element.Have in fields
Usual skill is, it is to be appreciated that manufacturer may call same element with different nouns.This specification and right will
It asks book not in a manner that the difference of title is used as and distinguishes element, but differentiation is used as with the difference of element functionally
Criterion.Be open term in the " comprising " of specification in the whole text and claim mentioned in, thus should be construed to " including but
It is not limited to ".
Referring to Fig. 1, its schematic diagram of projection arrangement 10 for being proposed by the embodiment of the present invention.As shown in Figure 1, projection dress
It puts 10 to be used for projecting image to screen 12 to show image data, projection arrangement 10 includes light source 14, imaging unit 16, projection lens
First 18, filter unit 20 and reflecting element 22.14 output light of light source, filter unit 20 receive light and by light filter into
Multiple coloured light, by filter unit 20, treated that light reflected by reflecting element 22 and received by imaging unit 16.Imaging
Unit 16 receives multiple coloured light from reflecting element 22 and is transmitted to projection lens 18.Projection lens 18 is arranged on imaging unit
Between 16 and screen 12, the light from imaging unit 16 is projected on screen 12.In numerical digit optical treatment (Digital
Light Processing, DLP) in projector, filter unit 20 is colour wheel, and imaging unit 16 is numerical digit minitype reflector
(Digital Micromirror Device, DMD), reflecting element 22 are concave mirror.In liquid crystal projector, filter unit 20
It is optical filter, reflecting element 22 is mirror surface, and imaging unit 16 is liquid crystal display panel.
Referring to Fig. 2, the structure diagram for projection lens in Fig. 1 18.As shown in Fig. 2, projection lens 18 includes first
24 and second lens group 26 of lens group, 24 relative proximity screen 12 of the first lens group, 26 relative proximity of the second lens group imaging
Unit 16, wherein there is the first lens group 24 negative diopter to be used for divergent rays.Second lens group 26 have positive diopter with
For polymerizeing light.As shown in Figure 2, the first lens group 24 has the first lens 28, and the first lens 28 can with negative diopter
For curved month type negative lens, the second lens group 26 includes the second lens 30, and the second lens 30 have negative diopter and can be born for concave-concave
Lens, in this embodiment, the Abbe number of the first lens 28 is Vd1, the Abbe number of the second lens 30 is Vd2, and 0.4≤Vd2/Vd1
≤ 1.2, Vd1＜ 50, so as to effectively correcting image distortion (Distortion) and eliminating lateral chromatic aberration.In practical application
In, the refraction coefficient of the second lens 30 is preferably greater than equal to 1.64 and less than or equal to 1.87, the Abbe number V of the second lens 30d2
It is preferably greater than equal to 20 and less than or equal to 35, further, the second lens 30 can be preferably by with high refractive index and height
Dense flint glass (heavy flint-glass) material of abbe number is formed.
In addition to this, as shown in Figure 2, the second lens group 26 is also saturating comprising third lens 32, the 4th lens 34 and the 5th
Mirror 36, between the first lens 28 and the second lens 30, the 5th lens 36 are located at 32 and the 4th lens 34 of third lens
Between 16 and second lens 30 of imaging unit.It in this embodiment, can be preferable near the 5th lens 36 of imaging unit 16
For the non-spherical lens being made of glass material, with the practical need for meeting high temperature resistant and can further eliminating chromatic aberation
It asks, but not limited to this, specifically by designer depending on design requirement.That is, in embodiments of the present invention, projection lens 18 is only
It is formed by the lens group institute construction of five two groups, wherein containing only a piece of curved month type negative lens (i.e. the first lens 28), a piece of
Double-concave negative lens (i.e. the second lens 30) and three pieces have positive lens (i.e. third lens 32, the 4th lens of positive diopter
34 and the 5th lens 36).Table one lists the preferable parameter value of each lens of projection lens 18.In table one, " distance "
Value represents the spacing of the spacing, i.e. this row minute surface and next column minute surface on surface to the surface of next column of this corresponding row, and surface
S7 represents the position of the aperture 19 of projection lens 18, and surface S12 represents the position of imaging unit 16.
Table one
The cost of manufacture and structure design of projection lens 18 in order to balance, the present invention can preferably by projection lens 18 with into
As the focal length of lens ratio in the distance proportion of unit 16 and the first lens group 24 and the second lens group 26 is each defined in spy
In the range of fixed number value, but this is not limited.For example, the distance of the first lens 28 to third lens 32 is d1It is (substantially visual
Preceding coke for projection lens 18), the distance of the 5th lens 36 to imaging unit 16 is dbf1(it substantially can be considered projection lens 18
Rear coke), the focal lengths of the first lens 28 is f1, and the focal length of the second lens 30 is f2, then in this embodiment, dbf1/d1≤ 1,
dbf1≤ 20mm, further, 0.2 ≦ ∣ f2 ∣/∣ f1 ∣≤0.5.That is, in practical applications, if projection lens 18
It is more than the upper limit (i.e. d with the distance proportion of imaging unit 16bf1/d1>1), the total length of projection lens 18 can be caused shorter, projected
The rear coke d of camera lens 18bf1It is corresponding long and need to compared with multicomponent control chromatic aberation, so can not only improve setting for projection lens 18
Meter and cost of manufacture, at the same will also result in the first lens group 24 and the second lens group 26 be configured it is near and easily in focussing process
It generates constructive interference and damages, conversely, when the distance proportion of projection lens 18 and imaging unit 16 meets above-mentioned limitation (i.e. dbf1/
d1≤ 1, dbf1≤ 20mm, 0.2 ≦ ∣ f2 ∣/∣ f1 ∣≤0.5) when, the total length of projection lens 18 and the rear coke of projection lens 18
dbf1It is controlled in proper range, so as to which projection lens 18 and the other elements of projection arrangement 10 positively be avoided (to be such as imaged
Unit 16 etc.) interference happen, and the design and fabrication cost of projection lens 18 can be effectively reduced.It should be noted
It is, as shown in Table 1, in the case of the positive negativity for considering focal length, the second lens 30, third lens 32, the 4th lens 34, with
And the 5th the focal lengths of lens 36 be all higher than the focal lengths of the first lens 28；On the other hand, if under the premise of taking absolute value, second
Lens 30 have minimum focal length absolute value, that is to say, that in this embodiment, compared to the first lens 28, third lens 32,
4th lens 34 and the 5th lens 36, second lens 30 nearest apart from aperture 19 can have relatively highest refractive power
And generate the effect of further eliminating lateral chromatic aberration.
Fig. 3 to Fig. 5 is please referred to, Fig. 3 is the filed curvature (field curvature) of projection lens 18 and imaging in Fig. 2
Distort (distortion) simulation drawing, and Fig. 4 is the lateral chromatic aberration simulation drawing of projection lens 18 in Fig. 2, and Fig. 5 is to be projected in Fig. 2
Modulation transfer function (modulation transfer function, MTF) simulation drawing of camera lens 18.It can from above-mentioned pattern analysis
Know, projection lens 18 of the present invention obtains good control in image deformation, filed curvature and lateral chromatic aberration etc., according to tune
Transfer function simulation drawing processed is it can be seen that the projection lens 18 of the present invention has splendid performance in contrast contrast and sharpness.
In conclusion there are the first lens of negative diopter with just bending in the first lens group of the present invention using negative diopter
The lens configuration of the second lens comprising negative diopter in second lens group of luminosity and the Abbe number V using the first lensd1
Less than 50 and first lens Abbe number Vd1With the Abbe number V of the second lensd2Ratio value be 0.4 to 1.2 (i.e. 0.4≤Vd2/
Vd1≤ 1.2) design so can effectively correct image distortion and eliminate lateral chromatic aberration, so as to improve projection arrangement
Image quality and reduce projection lens lens numbers, to meet the price of product and volume production advantage.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only the example for implementing the present invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from the present invention spirit and
In the range of made change and retouch, belong to the present invention scope of patent protection.
Claims (10)
1. a kind of projection lens, which is characterized in that include：Projection lens is applied on the image projecting of projection arrangement, the projection
Device is used for projecting image to screen, and the projection arrangement includes imaging unit, which includes：
First lens group has negative diopter, and first lens group is adjacent to the screen and with the first lens, first lens tool
There is the first negative diopter；And
Second lens group has positive diopter, and for second lens group adjacent to the imaging unit and comprising the second lens, third is saturating
Mirror, the 4th lens and the 5th lens, second lens have the second negative diopter, the 5th lens, and the 5th lens are located at should
Between imaging unit and second lens, the 5th lens are non-spherical lens；
Wherein, the Abbe number of first lens is Vd1, the Abbe number of second lens is Vd2, and 0.4≤Vd2/Vd1≤ 1.2, Vd1
＜ 50；
The refractive power of second lens is more than first lens, the third lens, the 4th lens and the 5th lens
Refractive power.
2. projection lens as described in claim 1, which is characterized in that the refraction coefficient of second lens be more than or equal to 1.64 and
Less than or equal to 1.87, the Abbe number of second lens is more than or equal to 20 and less than or equal to 35.
3. projection lens as described in claim 1, which is characterized in that second lens are made of dense flint glass material.
4. projection lens as described in claim 1, which is characterized in that the third lens and the 4th lens be located at this first
Between lens and second lens, the 5th lens are located between the imaging unit and second lens, first lens
Distance to the third lens is d1, the distance of the 5th lens to the imaging unit is dbf1, and dbf1/d1≤ 1, dbf1≧
20mm。
5. projection lens as described in claim 1, which is characterized in that second lens, the third lens, the 4th lens with
And the 5th the focal lengths of lens be all higher than the focal lengths of first lens.
6. projection lens as described in claim 1, which is characterized in that the refractive index of the first lens is equal to 1.546538.
7. such as claim 1 to 6 any one of them projection lens, which is characterized in that the focal length of first lens is f1, this
The focal length of two lens is f2, and 0.2 ≦ ∣ f2∣/∣f1∣≦0.5。
8. a kind of projection arrangement, for projecting image to screen, which is characterized in that the projection arrangement includes：
Light source, for providing light；
Projection lens as described in any one in claim 1-7；And
The imaging unit, for receiving the light, which is set between the imaging unit and the screen to be used for throwing
The light is penetrated to the screen.
9. projection arrangement as claimed in claim 8, which is characterized in that the focal length of first lens is f1, the coke of second lens
Away from for f2, and 0.2 ≦ ∣ f2∣/∣f1∣≦0.5。
10. projection arrangement as claimed in claim 8, which is characterized in that the projection arrangement for numerical digit optical processing projector or
Liquid crystal projector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810162090.2A CN108267846A (en) | 2015-08-28 | 2015-08-28 | Projection lens and projection arrangement |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810162090.2A CN108267846A (en) | 2015-08-28 | 2015-08-28 | Projection lens and projection arrangement |
| CN201510541269.5A CN105158883B (en) | 2015-08-28 | 2015-08-28 | Projection lens and projection arrangement |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510541269.5A Division CN105158883B (en) | 2015-08-28 | 2015-08-28 | Projection lens and projection arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108267846A true CN108267846A (en) | 2018-07-10 |
Family
ID=54799791
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810162090.2A Pending CN108267846A (en) | 2015-08-28 | 2015-08-28 | Projection lens and projection arrangement |
| CN201510541269.5A Active CN105158883B (en) | 2015-08-28 | 2015-08-28 | Projection lens and projection arrangement |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510541269.5A Active CN105158883B (en) | 2015-08-28 | 2015-08-28 | Projection lens and projection arrangement |
Country Status (1)
| Country | Link |
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| CN (2) | CN108267846A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110515188A (en) * | 2019-09-23 | 2019-11-29 | 深圳市点睛创视技术有限公司 | A kind of projection lens |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116774409B (en) * | 2023-08-25 | 2023-10-17 | 深圳爱图仕创新科技股份有限公司 | Projection lens and lamp |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207607A (en) * | 2010-03-31 | 2011-10-05 | 中强光电股份有限公司 | Zoom lens |
| CN102338927B (en) * | 2010-07-14 | 2013-08-21 | 佳能株式会社 | Zoom lens and image pickup apparatus equipped with zoom lens |
| CN103376538A (en) * | 2012-04-23 | 2013-10-30 | 信泰光学(深圳)有限公司 | Zooming lens Zoom lens |
| CN104076493A (en) * | 2014-05-13 | 2014-10-01 | 苏州佳世达光电有限公司 | Projector |
| US20140327888A1 (en) * | 2012-01-20 | 2014-11-06 | Fujifilm Corporation | Projection zoom lens and projection type display device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458488C (en) * | 2006-01-24 | 2009-02-04 | 亚洲光学股份有限公司 | Fixed focus projection lens |
| CN103955046B (en) * | 2014-03-20 | 2016-09-07 | 苏州佳世达光电有限公司 | Projection lens and projection arrangement |
-
2015
- 2015-08-28 CN CN201810162090.2A patent/CN108267846A/en active Pending
- 2015-08-28 CN CN201510541269.5A patent/CN105158883B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207607A (en) * | 2010-03-31 | 2011-10-05 | 中强光电股份有限公司 | Zoom lens |
| CN102338927B (en) * | 2010-07-14 | 2013-08-21 | 佳能株式会社 | Zoom lens and image pickup apparatus equipped with zoom lens |
| US20140327888A1 (en) * | 2012-01-20 | 2014-11-06 | Fujifilm Corporation | Projection zoom lens and projection type display device |
| CN103376538A (en) * | 2012-04-23 | 2013-10-30 | 信泰光学(深圳)有限公司 | Zooming lens Zoom lens |
| CN104076493A (en) * | 2014-05-13 | 2014-10-01 | 苏州佳世达光电有限公司 | Projector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110515188A (en) * | 2019-09-23 | 2019-11-29 | 深圳市点睛创视技术有限公司 | A kind of projection lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105158883A (en) | 2015-12-16 |
| CN105158883B (en) | 2018-04-17 |
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