CN108303788A - A kind of ultrashort out-of-focus projection's optical system of refraction type - Google Patents
A kind of ultrashort out-of-focus projection's optical system of refraction type Download PDFInfo
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- CN108303788A CN108303788A CN201810299243.8A CN201810299243A CN108303788A CN 108303788 A CN108303788 A CN 108303788A CN 201810299243 A CN201810299243 A CN 201810299243A CN 108303788 A CN108303788 A CN 108303788A
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- Prior art keywords
- lens
- focal power
- lens group
- dmd chip
- optical system
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
Abstract
The invention discloses a kind of ultrashort out-of-focus projection's optical systems of refraction type, are disposed with from projection surface to dmd chip：First lens group, the second lens group, the third lens group；First lens group is fixed with respect to dmd chip, and focal power is negative；First lens group includes the first lens, the second lens, the third lens and the 4th lens set gradually along projection surface；Second lens group can be moved forward and backward with respect to dmd chip, and focal power is just；Second lens group includes the 5th lens set gradually along projection surface；The third lens group is fixed with respect to dmd chip, and the focal power of the third lens group is just；The third lens group includes the 6th lens, the 7th lens, diaphragm, the 8th lens, the 9th lens and the tenth lens set gradually along projection surface.The present invention is projected than greatly, realizing 0.4 or less and projecting ratio.The present invention uses non-telecentricity framework, need not use prism with the lighting system of camera lens collocation, greatly reduce cost.
Description
【Technical field】
The present invention relates to the optical system in shadow casting technique, especially a kind of ultrashort out-of-focus projection's optical system of refraction type.
【Background technology】
Recently as the development of shadow casting technique, ultra-short focus projection lens are applied to laser television and height extensively
On brightness projection machine.
Ultra-short focus projection lens currently on the market have the disadvantage that：
1. using refraction type structure, projection ratio is not ultra-short focus projection lens truly 0.45 or more, projection
Than the definition for just meeting ultrashort coke less than or equal to 0.4.
2. using the hybrid ultrashort zoom lens of catadioptric, speculum difficulty of processing is high, and the requirement of opposite type is extremely harsh, week
Side image quality is usually bad；
3. using the hybrid ultrashort zoom lens of catadioptric, when operating distance changes, distortion variation is violent, the work of this camera lens
It is often shorter to make distance, when projection image requires 300 cun or more, this camera lens can not use.
4. using the hybrid ultrashort zoom lens of catadioptric, since heavy caliber Glass aspheric manufacturing cost is high, often use
The aspherical replacement Glass aspheric of more heavy caliber plastic cement causes camera lens to be solved at high operating temperatures as being deteriorated.
5, in the market the hybrid-type ultrashort zoom lens generally use telecentricity framework of the ultrashort zoom lens of refraction type and catadioptric,
Must use prism before camera lens and illumination chip, prism it is expensive, it is also high to lead to the price of projector.
Therefore, the present invention is based on above deficiency and generates.
【Invention content】
The technical problem to be solved in the present invention is to provide a kind of high-resolution, projection than less than or equal to 0.4, low cost,
The ultrashort out-of-focus projection's optical system of refraction type that can be mass.
In order to solve the above technical problems, present invention employs following technical proposals：
A kind of ultrashort out-of-focus projection's optical system of refraction type, it is characterised in that be disposed with from projection surface to dmd chip：The
One lens group, the second lens group, the third lens group；
First lens group is fixed with respect to dmd chip, and the focal power of the first lens group is negative；
First lens group includes the first lens, the second lens, the third lens and the 4th set gradually along projection surface
Lens；
Second lens group can be moved forward and backward with respect to dmd chip, and the focal power of the second lens group is just；
Second lens group includes the 5th lens set gradually along projection surface；
The third lens group is fixed with respect to dmd chip, and the focal power of the third lens group is just；
The third lens group include the 6th lens set gradually along projection surface, the 7th lens, diaphragm, the 8th lens,
9th lens and the tenth lens.
A kind of ultrashort out-of-focus projection's optical system of refraction type as described above, it is characterised in that the first power of lens is
Negative, two sides bends towards DMD new films, and second power of lens is negative, and two sides bends towards dmd chip, the light of the third lens
Focal power is negative, and backwards to dmd chip, the 4th power of lens is that just, the 5th power of lens is just institute on two sides
State the 6th power of lens be it is negative, the 7th power of lens be just, the 8th power of lens be just, it is described
9th power of lens is negative, and the tenth power of lens is just that the diaphragm is located at the 7th lens and the 8th lens
Between.
A kind of ultrashort out-of-focus projection's optical system of refraction type as described above, it is characterised in that the light focus of the first lens group is
Negative, focal power meets：-0.11<φ100<-0.1；The focal power of second lens group is that just, focal power meets：0.03<φ200<
0.035；The focal power of the third lens group is that just, focal power meets：0.031<φ300<0.035。
A kind of ultrashort out-of-focus projection's optical system of refraction type as described above, it is characterised in that the 6th power of lens is full
Foot：0.062<φ6<0.065, the 7th lens strength meets：0.042<φ7<0.045, the 8th lens strength meets：0.042
<φ8<0.045, the 9th lens strength meets：-0.12<φ9<- 0.1, the tenth lens strength meets：0.07<φ9<0.09,
Diaphragm is between the 8th lens of the 7th lens.
A kind of ultrashort out-of-focus projection's optical system of refraction type as described above, it is characterised in that the 4th the second face of lens and DMD
The distance L of chip, the first face of the first lens and dmd chip distance L ' satisfactions：0.6<L/L′<0.7, the light focus of the first lens
Degree meets：-0.04<Φ1<0.035, the third lens meet with the 4th power of lens：-0.002<Φ3+Φ4<-0.001。
A kind of ultrashort out-of-focus projection's optical system of refraction type as described above, it is characterised in that the 8th lens and described the
Nine lens, the 9th lens are bonded with the tenth lens by optical glue, and three balsaming lens groups are formed.
A kind of ultrashort out-of-focus projection's optical system of refraction type as described above, it is characterised in that first lens, third
Lens and the 4th lens are plastic cement aspherical lens, the center thickness T of the 5th lens5>10mm。
A kind of ultrashort out-of-focus projection's optical system of refraction type as described above, it is characterised in that first lens, third
The aspherical surface shape of lens and the 4th lens meets following equation：
In formula, parameter c is the curvature corresponding to radius, its unit is identical with length of lens unit for radial coordinate by y,
K is circular cone whose conic coefficient；When k-factor is less than -1, the face shape curve of lens is hyperbola, when k-factor is equal to -1, thoroughly
The face shape curve of mirror is parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, when k-factor is equal to 0
When, the face shape curve of lens is circle, and when k-factor is more than 0, the face shape curve of lens is oblateness；a1To a8It indicates respectively each
Asphericity coefficient corresponding to radial coordinate.
Compared with prior art, the ultrashort out-of-focus projection's optical system of a kind of refraction type of the invention, has reached following effect：
1, present invention projection is than greatly, realizing 0.4 or less and projecting ratio.
2, the present invention uses non-telecentricity framework, need not use prism with the lighting system of camera lens collocation, greatly reduce
Cost.
3, the present invention realizes cun super large projection scope from 55 cun to 500, and image definition can be kept not change.
4, present invention uses more plastic cement is aspherical, arrange in pairs or groups lighting system use when can realize that high temperature does not run coke.
【Description of the drawings】
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings, wherein：
Fig. 1 is schematic diagram of the present invention；
Description of the drawings：100, the first lens group；200, the second lens group；300, the third lens group；400, dmd chip；1、
First lens；2, the second lens；3, the third lens；4, the 4th lens；5, the 5th lens；6, the 6th lens；7, the 7th lens；8、
8th lens；9, the 9th lens；10, the tenth lens；11, diaphragm.
【Specific implementation mode】
It elaborates below in conjunction with the accompanying drawings to embodiments of the present invention.
As shown in Figure 1, a kind of ultrashort out-of-focus projection's optical system of refraction type, successively from projection surface 500 to dmd chip 400
It is provided with：First lens group 100, the second lens group 200, the third lens group 300；First lens group is with respect to dmd chip 400
Fixed, the focal power of the first lens group is negative；
First lens group includes the first lens 1 set gradually along projection surface, the second lens 2, the third lens 3 and the
Four lens 4.
Second lens group can be moved forward and backward with respect to dmd chip 400, and the focal power of the second lens group is just；
Second lens group includes the 5th lens 5 set gradually along projection surface.
The third lens group is fixed with respect to dmd chip 400, and the focal power of the third lens group is just；
The third lens group is saturating comprising the 6th lens 6, the 7th lens 7, diaphragm the 11, the 8th set gradually along projection surface
Mirror 8, the 9th lens 9 and the tenth lens 10.
As shown in Figure 1, in the present embodiment, the focal power of first lens 1 is negative, and two sides bends towards dmd chip 400,
The focal power of second lens 2 is negative, and two sides bends towards dmd chip 400, and the focal power of the third lens 3 is negative, the two sides back of the body
To dmd chip 400, the focal power of the 4th lens 4 is that just, the focal power of the 5th lens 5 is just the 6th lens
6 focal power is negative, and the focal power of the 7th lens 7 is that just, the focal power of the 8th lens 8 is that just, the described 9th thoroughly
The focal power of mirror 9 is negative, and the focal power of the tenth lens 10 is just that the diaphragm 11 is located at the 7th lens 7 and the 8th lens 8
Between.
As shown in Figure 1, in the present embodiment, the light focus of the first lens group is negative, and focal power meets：-0.11<φ100<-
0.1；The focal power of second lens group is that just, focal power meets：0.03<φ200<0.035；The focal power of the third lens group be just,
Focal power meets：0.031<φ300<0.035；When system structure is distributed by this focal power, it can be achieved that projection is than being less than 0.4.
First lens 1, the third lens 3 and the 4th lens 4 are aspherical using plastic cement, for correct big visual field distortion and as
It dissipates, and reduces the off-axis ray height into the second lens group, system is made to possess higher resolution ratio；5th lens 5 are just thoroughly
Mirror, using the structure of thick lens, the center thickness T of the 5th lens5>10mm, when operating distance difference, the 5th lens 5 can before
After move, make different operating apart from when image planes conjugation apart from constantization, realize 55 cun minimum, maximum 500 cun of super large projects model
It encloses.
6th power of lens meets：0.062<φ6<0.065,7 focal power of the 7th lens meets：0.042<φ7<
0.045,8 focal power of the 8th lens meets：0.042<φ8<0.045,9 focal power of the 9th lens meets：-0.12<φ9<- 0.1,
Tenth lens, 10 focal power meets：0.07<φ9<0.09, and meet diaphragm 11 simultaneously between the 8th lens 8 of the 7th lens 7
When, the third lens group 300 can be made to send out to the light of dmd chip not parallel with optical axis, realize non-telecentricity framework, dmd chip with
Prism need not be added among camera lens, cost is greatly lowered.
4th lens, 4 second face and 400 distance L of dmd chip, the first lens 1 the first face and dmd chip 400 away from
From L ' satisfactions：0.6<L/L′<0.7, the first power of lens meets：-0.04<Φ1<0.035, the third lens 3 and the 4th are thoroughly
The focal power of mirror 4 meets：-0.002<Φ3+Φ4<- 0.001, it can be achieved that camera lens is in projection machine when conditions above meets simultaneously
When hot operation, the burnt phenomenon of no race.
As shown in Figure 1, in the present embodiment, the 8th lens 8 and the 9th lens 9, the 9th lens 9 and institute
It states the tenth lens 10 to bond by optical glue, forms three balsaming lens groups.
As shown in Figure 1, in the present embodiment, first lens 1, the third lens 3 and the 4th lens 4 are plastic cement aspheric
Face eyeglass.
As shown in Figure 1, in the present embodiment, first lens 1, the third lens 3 and the 4th lens 4 it is aspherical
Surface shape meets following equation：
In formula, parameter c is the curvature corresponding to radius, its unit is identical with length of lens unit for radial coordinate by y,
K is circular cone whose conic coefficient；When k-factor is less than -1, the face shape curve of lens is hyperbola, when k-factor is equal to -1, thoroughly
The face shape curve of mirror is parabola；When k-factor is between -1 to 0, the face shape curve of lens is ellipse, when k-factor is equal to 0
When, the face shape curve of lens is circle, and when k-factor is more than 0, the face shape curve of lens is oblateness；a1To a8It indicates respectively each
Asphericity coefficient corresponding to radial coordinate.
Following case is 0.4 projection ratio, is suitable for the actual design of the ultrashort zoom lens of refraction type of 0.65 inch of dmd chip
Parameter：
The coefficient of first face S1 of the first lens 1 is：k：-360.9261
a1：0
a2：1.5862485e-005
a3：-1.6465724e-008
a4：1.0455223e-011
a5：-3.6781575e-015
a6：6.0490365e-019
a7：-3.3308723e-024
a8：-4.0999467e-027
The coefficient of second face S2 of the first lens 1 is：k：-0.566457626
a1：0
a2：-3.3262484e-006
a3：7.6618764e-008
a4：9.0507833e-011
a5：-5.7609714e-013
a6：1.2785732e-016
a7：2.2938777e-021
a8：-5.2180554e-024
The coefficient of first face S5 of the third lens 3 is：
k：6.43568
a1：0
a2：-0.000274699
a3：6.1673982e-007
a4：-3.1567446e-010
a5：-5.2418365e-012
a6：1.7113063e-014
a7：1.9882187e-018
a8：9.0976858e-021
The coefficient of second face S6 of the third lens 3 is：
k：-1.252968
a1：0
a2：-0.00023084615
a3：3.935472e-007
a4：1.0898475e-009
a5：-7.1170934e-012
a6：1.2935133e-014
a7：1.5831759e-019
a8：7.0198938e-021
The coefficient of second face S7 of the 4th lens 4 is：
k：-0.3854946
a1：0
a2：6.142123e-005
a3：6.8506675e-008
a4：8.7008431e-010
a5：-3.3554869e-012
a6：-3.9240816e-016
a7：-1.1021867e-018
a8：8.0398256e-021
The coefficient of second face S8 of the 4th lens 4 is：
k：-334.9018
a1：0
a2：1.7656773e-005
a3：7.3183104e-007
a4：-3.5761247e-010
a5：-5.065145e-012
a6：1.9760963e-016
a7：2.4140799e-018
a8：2.4660789e-020
The projection scope of ultra-short focus projection lens is 0.5m to 4.5m, the interval variation range between when focusing each lens group
It is as follows：11.77~11.43mm, the second lens group 200 and are divided between first lens group 100 and the second lens group 200
It is divided into 10.55~10.89mm between three lens groups 300.
Claims (8)
1. a kind of ultrashort out-of-focus projection's optical system of refraction type, it is characterised in that it is disposed with from projection surface to dmd chip：The
One lens group (100), the second lens group (200), the third lens group (300) and dmd chip；
First lens group is fixed with respect to dmd chip, and the focal power of the first lens group is negative；
First lens group include the first lens (1) set gradually along projection surface, the second lens (2), the third lens (3) and
4th lens (4).
Second lens group can be moved forward and backward with respect to dmd chip, and the focal power of the second lens group is just；
Second lens group includes the 5th lens (5) set gradually along projection surface；
The third lens group is fixed with respect to dmd chip, and the focal power of the third lens group is just；
The third lens group includes the 6th lens (6) set gradually along projection surface, the 7th lens (7), diaphragm (11), the 8th
Lens (8), the 9th lens (9) and the tenth lens (10).
2. the ultrashort out-of-focus projection's optical system of a kind of refraction type according to claim 1, it is characterised in that the first lens (1)
Focal power is negative, and two sides bends towards DMD new films, and the focal powers of second lens (2) is negative, and two sides bends towards dmd chip, described
The focal power of three lens (3) is negative, and backwards to dmd chip, the focal power of the 4th lens (4) is that just, the described 5th thoroughly on two sides
The focal power of mirror (5) is that just, the focal power of the 6th lens (6) is negative, and the focal power of the 7th lens (7) is just institute
The focal power for stating the 8th lens (8) is just that the focal power of the 9th lens (9) is negative, the light focus of the tenth lens (10)
Degree is just, the diaphragm (11) is between the 7th lens (7) and the 8th lens (8).
3. the ultrashort out-of-focus projection's optical system of a kind of refraction type according to claim 1, it is characterised in that the first lens group
Light focus is negative, and focal power meets：-0.11<φ100<-0.1；The focal power of second lens group is that just, focal power meets：0.03<
φ200<0.035；The focal power of the third lens group is that just, focal power meets：0.031<φ300<0.035。
4. the ultrashort out-of-focus projection's optical system of a kind of refraction type according to claim 1, it is characterised in that the light of the 6th lens
Focal power meets：0.062<φ6<0.065, the 7th lens (7) focal power meets：0.042<φ7<0.045, the 8th lens (8) light focus
Degree meets：0.042<φ8<0.045, the 9th lens (9) focal power meets：-0.12<φ9<- 0.1, the tenth lens (10) focal power
Meet：0.07<φ9<0.09, diaphragm (11) is located between the 8th lens (8) of the 7th lens (7).
5. the ultrashort out-of-focus projection's optical system of a kind of refraction type according to claim 1, it is characterised in that the 4th lens (4)
First face and the dmd chip distance L ' satisfactions in two faces and dmd chip distance L, the first lens (1)：0.6<L/L′<0.7, the
One power of lens meets：-0.04<Φ1<0.035, the third lens (3) and the focal power of the 4th lens (4) meet：-
0.002<Φ3+Φ4<-0.001。
6. the ultrashort out-of-focus projection's optical system of a kind of refraction type according to claim 1, it is characterised in that the 8th lens
(8) it is bonded by optical glue with the tenth lens (10) with the 9th lens (9), the 9th lens (9), composition three
Balsaming lens group.
7. the ultrashort out-of-focus projection's optical system of a kind of refraction type according to claim 1, it is characterised in that described first is thoroughly
Mirror (1), the third lens (3) and the 4th lens (4) are plastic cement aspherical lens, the center thickness T of the 5th lens5>10mm。
8. the ultrashort out-of-focus projection's optical system of a kind of refraction type according to claim 1, it is characterised in that described first is thoroughly
The aspherical surface shape of mirror (1), the third lens (3) and the 4th lens (4) meets following equation：
In formula, parameter (c) is the curvature corresponding to radius, and (y) for radial coordinate, its unit is identical with length of lens unit,
(k) it is circular cone whose conic coefficient；When (k) coefficient is less than -1, the face shape curves of lens is hyperbola, when (k) coefficient is equal to -
When 1, the face shape curve of lens is parabola；When (k) coefficient is between -1 to 0, the face shape curve of lens is ellipse, when
(k) when coefficient is equal to 0, the face shape curve of lens is circle, and when (k) coefficient is more than 0, the face shape curve of lens is oblateness；
(a1) to (a8) asphericity coefficient corresponding to each radial coordinate is indicated respectively.
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| CN201810299243.8A CN108303788A (en) | 2018-04-04 | 2018-04-04 | A kind of ultrashort out-of-focus projection's optical system of refraction type |
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| CN201810299243.8A CN108303788A (en) | 2018-04-04 | 2018-04-04 | A kind of ultrashort out-of-focus projection's optical system of refraction type |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI676835B (en) * | 2018-09-26 | 2019-11-11 | 大陸商信泰光學（深圳）有限公司 | Wide-angle lens assembly |
| CN111025825A (en) * | 2019-12-31 | 2020-04-17 | 广景视睿科技（深圳）有限公司 | Projection lens |
| CN112068291A (en) * | 2019-06-11 | 2020-12-11 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus |
| WO2021052345A1 (en) * | 2019-09-18 | 2021-03-25 | Oppo广东移动通信有限公司 | Imaging method, imaging module and electronic device |
-
2018
- 2018-04-04 CN CN201810299243.8A patent/CN108303788A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI676835B (en) * | 2018-09-26 | 2019-11-11 | 大陸商信泰光學（深圳）有限公司 | Wide-angle lens assembly |
| CN112068291A (en) * | 2019-06-11 | 2020-12-11 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus |
| CN112068291B (en) * | 2019-06-11 | 2022-05-06 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus |
| WO2021052345A1 (en) * | 2019-09-18 | 2021-03-25 | Oppo广东移动通信有限公司 | Imaging method, imaging module and electronic device |
| CN111025825A (en) * | 2019-12-31 | 2020-04-17 | 广景视睿科技（深圳）有限公司 | Projection lens |
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