CN208872930U - A kind of projection lens system of dynamic compensation focal power - Google Patents
A kind of projection lens system of dynamic compensation focal power Download PDFInfo
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- CN208872930U CN208872930U CN201821590443.0U CN201821590443U CN208872930U CN 208872930 U CN208872930 U CN 208872930U CN 201821590443 U CN201821590443 U CN 201821590443U CN 208872930 U CN208872930 U CN 208872930U
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- lens
- focal power
- dynamic compensation
- projection lens
- spatial modulation
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Abstract
The utility model discloses a kind of projection lens systems of dynamic compensation focal power, spatial modulation device, Amici prism, the first lens group, diaphragm, the second lens group and screen are successively placed with along optical axis including direction from the object side to image side, wherein including first plastic lens and the second plastic lens in direction from the object side to image side in the second lens group.The projection lens system of the utility model dynamic compensation focal power does not need detecting camera lens temperature regime or projected picture situation, then do focal power adjustment, but situation is varied with temperature using the thermal deformation and refractive index of plastic lens to balance the image plane offset of entire projection lens, not only it had realized focal power dynamic to compensate, but also has reduced product cost.
Description
Technical field
The utility model relates to optical projection technical fields, and in particular to a kind of projection lens system of dynamic compensation focal power
System.
Background technique
In projection imaging optical path, DMD (Digital Micromirror Device, digital micromirror array), LCD
The types such as (Liquid Crystal Display, liquid crystal) or LCoS (Liquid Crystal on Silicon, liquid crystal on silicon)
Chip as spatial modulation device, the useful space modulates face as object plane and passes through lens imaging to display screen, usual throwing
Distance, that is, projector distance (being equivalent to image distance) of shadow camera lens to display screen is much larger than lens focus, therefore the useful space modulates face
The object space focal plane for being placed on projection lens is nearby slightly distal to focal plane position.In the higher projector of brightness, pass through projection
The optical power of camera lens is higher, and the subsequent a period of time projection lens temperature that is switched on can gradually rise.And projection lens is saturating by several pieces
Mirror or reflection device composition, lens then use optical glass or optical plastic to make, and Refractive Index of Material can vary with temperature production
Changing, while lens plane of refraction can also vary with temperature generation deformation, if not doing special optimum organization, index of refraction in lens variation
The focal length that will lead to camera lens changes, and the object distance for being equivalent to projection lens changes, and since object distance is close to focal length, object distance is
Keep variation very faint, also results in the image distance i.e. variation of projector distance highly significant.Therefore, if not doing specific aim processing,
Using the projection products of the lens, open state focuses on display screen backstage under certain projector distance, and as the temperature rises, and it is poly-
Focal plane can generate offset without refocusing in display screen, cause picture to generate fuzzy, need to readjust lens location progress
It focuses.The prior art to the mode that focal power compensates have by the way of spacer ring (patent ZL201110135277) or
Person increases the mode (patent 201510495184) that heat source adjusts component, varies with temperature adjustment lens spacing using spacer ring,
Focal length variations caused by generated reversed focal length variations compensation camera lens temperature change, because by spacer ring material physical characteristic
To limit its compensation ability limited；In such a way that heat source adjusts component, alleviate what camera lens temperature change generated to a certain extent
Focal shift problem, but the projection light energy for passing through camera lens can cause temperature to rise by lens component absorption in the same old way, especially
Situation using DMD as spatial modulation device, a large amount of modulation light are irradiated to lens barrel inner wall by the effective clear aperature of camera lens
Temperature is caused to rise.
Utility model content
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of dynamic compensation light
The projection lens system of focal power overcomes the defect that the prior art is weak to the compensation ability of projection lens system focal power.
Technical solutions adopted by the utility model to solve the above technical problems are as follows:
A kind of projection lens system of dynamic compensation focal power, including direction is successively placed with along optical axis from the object side to image side
Spatial modulation device, Amici prism, the first lens group, diaphragm, the second lens group and screen, wherein include in the second lens group from
First plastic lens and second plastic lens of the object side to image side direction.
The light emission side of embodiment according to the present utility model, the second plastic lens is provided with glass lens.
Embodiment according to the present utility model is provided with glass lens between first plastic lens and the second plastic lens.
Embodiment according to the present utility model, the first plastic lens and the second plastic lens are set as non-spherical lens.
The object space relative aperture of embodiment according to the present utility model, system is less than F3.5, is greater than F1.5.
Embodiment according to the present utility model, it is the spatial modulation device, the Amici prism, the first lens group, described
The optical path that diaphragm, the second lens group are formed is set as object space telecentric beam path.
Embodiment according to the present utility model, the spatial modulation device are set as LCoS spatial modulation device, the light splitting
Prism is set as PBS prism.
Embodiment according to the present utility model, the spatial modulation device are set as DMD spatial modulation device, the light splitting rib
Mirror is set as TIR total reflection Amici prism or RTIR total reflection Amici prism.
Embodiment according to the present utility model, the spatial modulation device are set as LCD spatial modulation device, the light splitting rib
Mirror is set as X-Cube color-combination prism.
Implement the technical solution of the utility model, has the advantages that the utility model dynamic compensation focal power
Projection lens system does not need detecting camera lens temperature regime or projected picture situation, then does focal power adjustment, but utilizes
The thermal deformation of plastic lens and refractive index vary with temperature situation to balance the image plane offset of entire projection lens, both realize
Focal power dynamic compensates, and reduces product cost.
Detailed description of the invention
The utility model is specifically described below with reference to attached drawing and in conjunction with example, the advantages of the utility model and realization
Mode will be more obvious, and wherein content shown in attached drawing is only used for the explanation to the utility model, without constituting to this reality
With it is novel in all senses on limitation, in the accompanying drawings:
Fig. 1 is the utility model first embodiment schematic diagram；
Fig. 2 is the utility model second embodiment schematic diagram.
Specific embodiment
1. object plane refers to the face where spatial modulation device effective display area domain, as plane refers to projection screen.
2. object plane is the maximum border circular areas that can be imaged of center camera lens as true field using optical axis, true field
Radius is that maximum object plane half is high.
3. object space telecentric beam path: diaphragm by the distance of optical path imaging to object plane between object plane and diaphragm be into
Interpupillary distance is infinity.Consider practical situation, the object space telecentric beam path of technical solutions of the utility model meaning refers to be greater than into interpupillary distance
High 30 times of maximum object plane half.
4. camera lens object space central vision is angular aperture θ by diaphragm rim ray and optical axis included angle, then object space relative aperture
F# are as follows:
5. minimum geometry modulation transfer function refers to geometry of the camera lens to arbitrary point in true field under designated space frequency
The minimum value of modulation transfer function, it is generally the case that when geometry modulation transfer function is greater than 30%, image quality is good.
6. it is the lens of spherical surface that non-spherical lens, which indicates at least one face not, even polynomial repressentation axis pair is generallyd use
What is claimed is aspherical, and the rise of aspherical upper arbitrary point is indicated with z, indicates distance of the point to optical axis, c vertex curvature, k table with r
Show circular cone coefficient, even polynomial equation is as follows:
Usual optical lens material refractive index can rise with temperature and be reduced, while there are also thermal expansion and contraction, the two is comprehensive
The variation of focal power is generated altogether, and the chamber of commerce, material factory provides refractive index and varies with temperature data and thermal expansion coefficient.Material folding
The rate of penetrating is varied with temperature to be indicated with following formula, and glass material used in the present invention, manufacturer gives D0、D1、D2、E0、E1
With λtkCoefficient.Plastic material would generally provide the refractive index at some temperature, can calculate corresponding coefficient by fitting and be used for
Design optimization and simulation.
The temperature distribution state that camera lens start-up operation will appear to thermal balance process is set in the design process, for every
A state carries out aberration balancing and ensures imaging surface in tolerance interval.
The utility model dynamic compensate focal power projection lens system, including from the object side to image side direction along optical axis successively
It is placed with spatial modulation device, Amici prism, the first lens group, diaphragm, the second lens group and screen, wherein in the second lens group
The first plastic lens and the second plastic lens including direction from the object side to image side.Embodiment according to the present utility model, second
The light emission side of plastic lens is provided with glass lens.Glass lens is provided between first plastic lens and the second plastic lens.
First plastic lens and the second plastic lens are set as non-spherical lens.The object space relative aperture of projection lens system is less than F3.5,
Greater than F1.5.The light that the spatial modulation device, the Amici prism, the first lens group, the diaphragm, the second lens group are formed
Road is set as object space telecentric beam path.The spatial modulation device is set as LCoS spatial modulation device, and the Amici prism is set as PBS rib
Mirror.The spatial modulation device is set as DMD spatial modulation device, the Amici prism be set as TIR total reflection Amici prism or
RTIR is totally reflected Amici prism.The spatial modulation device is set as LCD spatial modulation device, and the Amici prism is set as X-Cube
Color-combination prism.
Embodiment 1
As shown in Figure 1, the projection lens system of the utility model dynamic compensation focal power include between modulation device 10, equivalent
Amici prism 11, lens group 12, diaphragm 13, lens group 14 and the screen 15 of expansion form, and set saturating between diaphragm and screen
Two lens 141 and 142 in microscope group 14 use optics plastic cement material.It is 460nm, 540nm, 620nm, master that operation wavelength, which is arranged,
Wavelength is 540nm, and air lens relevant parameter is as shown in table 1, stationary lens be arranged parameter as shown in table 2a, wherein the 16th, 17,
20,21 faces are even aspheric surface, and equation coefficient is as shown in table 2b.Table 3a is focal power temperature dynamic compensation analog case, wherein
Temperature setting 1 indicates that camera lens is in 20 DEG C of states of desired homogeneous temperature, and 2~temperature setting of temperature setting, 5 simulating lens are from uniform
0 DEG C of the temperature camera lens minimum geometry modulation transfer function analog case to during being stepped up to higher steady-working state,
Lens separation is supported using aluminium spacer ring.The analog result of table 3a shows in entire temperature changing process that camera lens minimum geometry is modulated
Transmission function is all larger than 30%, and image quality keeps good.
1 embodiment of table, 1 relevant design parameter (20 DEG C of desired homogeneous temperature)
Parameter (unit: mm) is arranged in table 2a stationary lens
The serial number in each face of prism, lens is successively sorted by object side to image side.
Table 2b even aspheric surface equation coefficient
The temperature dynamic compensation simulation of table 3a focal power
Table 3b lists camera lens described in embodiment 1 from several representative temperatures into thermal equilibrium state change procedure of starting to work
Distribution.
Table 3b
| Temperature setting 1 | Temperature setting 2 | Temperature setting 3 | Temperature setting 4 | Temperature setting 5 | |
| Spatial modulator 10 | 20℃ | 0℃ | 35℃ | 50℃ | 70℃ |
| Spread equivalently prism 11 | 20℃ | 0℃ | 35℃ | 50℃ | 70℃ |
| Lens group 12 | 20℃ | 0℃ | 30℃ | 45℃ | 60℃ |
| Lens group 14 | 20℃ | 0℃ | 25℃ | 35℃ | 45℃ |
Table 3c lists the focal power situation of embodiment 1 lens group and two plastic lens under above-mentioned temperature distribution state,
And under each temperature setting, the minimum geometry modulation transfer function of lens imaging when simulation does not make any adjustments, then simulate vacation
If image planes to be moved a certain distance to minimum geometry modulation transfer function when finding lens imaging optimum.
Table 3c
Embodiment 2
As shown in Fig. 2, the utility model dynamic compensation focal power projection lens system include spatial modulation device 20, etc.
Amici prism 21, lens group 22, diaphragm 23, lens group 24 and the screen 25 for imitating expansion form, and set between diaphragm and screen
Two lens 241 and 242 in lens group 24 use optics plastic cement material.
4 embodiment of table, 2 relevant design parameter (20 DEG C of desired homogeneous temperature)
Parameter (unit: mm) is arranged in 2 stationary lens of table 5a embodiment
The serial number in each face of prism, lens is successively sorted by object side to image side.
2 even aspheric surface equation coefficient of table 5b embodiment
The 2 focal power temperature dynamic compensation simulation of table 6a embodiment
Table 6b lists camera lens described in embodiment 2 from several representative temperatures into thermal equilibrium state change procedure of starting to work
Distribution.
Table 6b
| Temperature setting 1 | Temperature setting 2 | Temperature setting 3 | Temperature setting 4 | Temperature setting 5 | |
| Spatial modulator 10 | 20℃ | 0℃ | 35℃ | 50℃ | 70℃ |
| Spread equivalently prism 11 | 20℃ | 0℃ | 35℃ | 50℃ | 70℃ |
| Lens group 12 | 20℃ | 0℃ | 30℃ | 45℃ | 60℃ |
| Lens group 14 | 20℃ | 0℃ | 25℃ | 35℃ | 45℃ |
Table 6c lists the focal power situation of embodiment 2 lens group and two plastic lens under above-mentioned temperature distribution state,
And under each temperature setting, the minimum geometry modulation transfer function of lens imaging when simulation does not make any adjustments, then simulate vacation
If image planes to be moved a certain distance to minimum geometry modulation transfer function when finding lens imaging optimum.
Table 6c
Above data illustrates that each lens group focal power changes in temperature changing process, and focal power temperature dynamic compensates
Itself do not ensure that entire camera lens focal power is constant, its object is to ensure that optimum image plane distance becomes in the case where not focusing again
Change is smaller, so that it is guaranteed that image quality is good, i.e., minimum geometry modulation transfer function is able to maintain 30% or more.
Those skilled in the art do not depart from the essence and spirit of the utility model, can realize this reality there are many deformation scheme
With novel, the above is only the preferably feasible embodiments of the utility model, not thereby limit to the right model of the utility model
It encloses, it is all with the variation of equivalent structure made by the utility model specification and accompanying drawing content, it is both contained in the power of the utility model
Within the scope of benefit.
Claims (9)
1. a kind of projection lens system of dynamic compensation focal power, it is characterised in that: including direction from the object side to image side along optical axis
It is successively placed with spatial modulation device, Amici prism, the first lens group, diaphragm, the second lens group and screen, wherein the second lens
It include first plastic lens and the second plastic lens in direction from the object side to image side in group.
2. the projection lens system of dynamic compensation focal power according to claim 1, it is characterised in that: the second plastic lens
Light emission side be provided with glass lens.
3. the projection lens system of dynamic compensation focal power according to claim 1, it is characterised in that: the first plastic lens
And second be provided with glass lens between plastic lens.
4. the projection lens system of dynamic compensation focal power according to claim 1, it is characterised in that: the first plastic lens
Non-spherical lens is set as with the second plastic lens.
5. the projection lens system of dynamic compensation focal power according to claim 1, it is characterised in that: the object space phase of system
F3.5 is less than to aperture, is greater than F1.5.
6. the projection lens system of dynamic compensation focal power according to claim 1, it is characterised in that: the spatial modulation
The optical path that device, the Amici prism, the first lens group, the diaphragm, the second lens group are formed is set as object space telecentric beam path.
7. the projection lens system of dynamic compensation focal power according to claim 1, it is characterised in that: the spatial modulation
Device is set as LCoS spatial modulation device, and the Amici prism is set as PBS prism.
8. the projection lens system of dynamic compensation focal power according to claim 1, it is characterised in that: the spatial modulation
Device is set as DMD spatial modulation device, and the Amici prism is set as TIR total reflection Amici prism or RTIR total reflection light splitting rib
Mirror.
9. the projection lens system of dynamic compensation focal power according to claim 1, it is characterised in that: the spatial modulation
Device is set as LCD spatial modulation device, and the Amici prism is set as X-Cube color-combination prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821590443.0U CN208872930U (en) | 2018-09-28 | 2018-09-28 | A kind of projection lens system of dynamic compensation focal power |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821590443.0U CN208872930U (en) | 2018-09-28 | 2018-09-28 | A kind of projection lens system of dynamic compensation focal power |
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| CN208872930U true CN208872930U (en) | 2019-05-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114384762A (en) * | 2020-10-19 | 2022-04-22 | 上海微电子装备（集团）股份有限公司 | Projection objective |
| CN115494636A (en) * | 2022-09-21 | 2022-12-20 | 歌尔光学科技有限公司 | Lens structure design method for compensating heat virtual focus influence and projection optical machine |
-
2018
- 2018-09-28 CN CN201821590443.0U patent/CN208872930U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114384762A (en) * | 2020-10-19 | 2022-04-22 | 上海微电子装备（集团）股份有限公司 | Projection objective |
| CN114384762B (en) * | 2020-10-19 | 2023-06-30 | 上海微电子装备（集团）股份有限公司 | Projection objective |
| CN115494636A (en) * | 2022-09-21 | 2022-12-20 | 歌尔光学科技有限公司 | Lens structure design method for compensating heat virtual focus influence and projection optical machine |
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Address after: 518067 3C, 3D, Block CD, Building 7, Xinghua Industrial Building, No. 4, Industrial 6th Road, Huaguoshan Community, Merchants Street, Nanshan District, Shenzhen, Guangdong Province Patentee after: Shenzhen Anhua Photoelectric Technology Co.,Ltd. Address before: 518000 room 201-202, building D, Chuangye No.1, 43 Yanshan Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN ANHUA OPTOELECTRONICS TECHNOLOGY Co.,Ltd. |