CN103955046B - Projection lens and projection arrangement - Google Patents
Projection lens and projection arrangement Download PDFInfo
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- CN103955046B CN103955046B CN201410106010.3A CN201410106010A CN103955046B CN 103955046 B CN103955046 B CN 103955046B CN 201410106010 A CN201410106010 A CN 201410106010A CN 103955046 B CN103955046 B CN 103955046B
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Abstract
The present invention provides a kind of projection lens, including the first set of lenses, has negative diopter and a neighbouring thing side, and this first set of lenses comprises and has negative dioptric first lens；And second set of lenses, there is positive diopter and neighbouring image side, this second set of lenses comprises second lens with positive diopter and has negative dioptric 3rd lens, and these second lens are between these the first lens and the 3rd lens, and the 3rd lens are made by dense flint glass material；Wherein, the hot Mutation parameter of these the second lens is D0, and 3.0 × e‑5≤D0≤‑6.0×e‑7。
Description
Technical field
The present invention provides a kind of projection lens and projection arrangement, and espespecially one can compensate automatically because heat makes a variation
(Thermal Shift) and the projection lens of out of focus (Focus shift/Defocus) and projection arrangement.
Background technology
The most common projector, in order to cost-effective, often uses non-spherical lens in projection lens.
Non-spherical lens is generally made by plastic cement material.Substantial amounts of non-spherical lens is used to be easily caused the life of projection lens
Produce yield the best.Additionally, along with the brightness of projector improves, the non-spherical lens of plastic cement material can produce heat
The defects such as variation and demoulding.Wherein, heat variation (Thermal Shift) refers to that projector completes defocused, temperature
Spending along with the time of use rises, ray machine (Optical Engine) metal chassis produces thermal expansion and sets up it
On projection lens optical element produce variations in refractive index and cause projection lens out of focus (Focus shift/
Defocus) image quality of projection lens, is affected.Therefore how to design one and can avoid the out of focus because of heat variation
Projection lens, just for optical lens industry give priority to target.
Summary of the invention
The invention provides a kind of can automatically compensate because heat variation and the projection lens of out of focus and projection arrangement.
On the one hand, the invention provides a kind of projection lens, include:
First set of lenses, has negative diopter and neighbouring thing side, and this first set of lenses comprises and has negative diopter
The first lens；And
Second set of lenses, has positive diopter and neighbouring image side, and this second set of lenses comprises and has positive diopter
The second lens with there are negative dioptric 3rd lens, these second lens are positioned at this first lens and the 3rd
Between lens, and the 3rd lens are made by dense flint glass material；
Wherein, the hot Mutation parameter of these the second lens is D0, and-3.0 × e-5≤D0≤-6.0×e-7。
It is also preferred that the left the focal length of this projection lens is f, the focal length of these the first lens is f1, the 3rd lens
Focal length is f3, and 1.5≤| f1 |/f≤3.6,0.3≤| f3 |/f≤0.9.
It is also preferred that the left the refraction coefficient of the 3rd lens is between 1.64 to 1.87, the Ah of the 3rd lens
Shellfish number is between 20 to 35.
It is also preferred that the left the 3rd lens are biconcave lens.
It is also preferred that the left these second lens are connected to the 3rd lens.
It is also preferred that the left the refractive index of these the second lens is n, and n >=1.57.
It is also preferred that the left this second set of lenses also comprises the 4th lens and the 5th lens with positive diopter, set up separately
Two sides in the 3rd lens.
On the other hand, the present invention also provides for a kind of projection arrangement, is used for projecting image to screen, this projection dress
Put and include:
Light source, it is provided that light；
Image-generating unit, receives this light；And
Projection lens, is arranged between this image-generating unit and this screen, in order to project this light to this screen,
This projection lens comprises:
First set of lenses, has negative diopter and this screen neighbouring, this first set of lenses comprise have negative
Dioptric first lens；And
Second set of lenses, has positive diopter and this image-generating unit neighbouring, and this second set of lenses comprises tool
Having the second lens of positive diopter and have negative dioptric 3rd lens, it is first saturating that these second lens are positioned at this
Between mirror and the 3rd lens, and the 3rd lens are made by dense flint glass；
Wherein, the hot Mutation parameter of these the second lens is D0, and-3.0 × e-5≤D0≤-6.0×e-7。
It is also preferred that the left the focal length of this projection lens is f, the focal length of these the first lens is f1, the 3rd lens
Focal length is f3, and 1.5≤| f1 |/f≤3.6,0.3≤| f3 |/f≤0.9.
It is also preferred that the left the refraction coefficient of the 3rd lens is between 1.64 to 1.87, the Ah of the 3rd lens
Shellfish number is between 20 to 35.
It is also preferred that the left these second lens are connected to the 3rd lens.
It is also preferred that the left the refractive index of these the second lens is n, and n >=1.57.
Comparing with prior art, the 3rd lens of the projection lens of the present invention use dense flint glass to make,
It is used for eliminating the chromatic aberation of projection lens, the ratio (hot Mutation parameter) that the refractive index of the second lens changes with the temperature difference
Meet-3.0 × e-5≤D0≤-6.0×e-7Restriction, make the second lens may be used to compensate the 3rd lens and expand with ray machine
The hot amount of variability produced, and then the hot variation compensation method that the projection demand of high brightness is provided.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the projection arrangement of the embodiment of the present invention；
Fig. 2 is the part-structure schematic diagram of the projection arrangement of the embodiment of the present invention；
Fig. 3 is the projection arrangement of embodiment of the present invention simulation drawing before heat makes a variation；
Fig. 4 is the simulation drawing after the 3rd lens heat variation of the embodiment of the present invention；
Fig. 5 is the simulation drawing after the ray machine housing heat variation of the embodiment of the present invention；
Fig. 6 is the simulation drawing after the second lens heat variation of the embodiment of the present invention；
Fig. 7 is the simulation drawing after the 4th lens heat variation of the embodiment of the present invention；
Fig. 8 is the projection arrangement of embodiment of the present invention simulation drawing after hot variation compensation.
Detailed description of the invention
For making the purpose of the present invention, structure, feature and function thereof are had further understanding, hereby coordinate reality
Execute example and describe in detail as follows.
Refer to the schematic diagram of the projection arrangement 10 that Fig. 1, Fig. 1 are the embodiment of the present invention.Projection arrangement 10 is used
Project image to screen 12.Projection arrangement 10 comprise light source 14, image-generating unit 16, projection lens 18,
Filter unit 20 and reflecting element 22.Light source 14 exports light, and filter unit 20 receives light and by light
Line filters into multiple coloured light, the light after filter unit 20 processes reflected by reflecting element 22 and by becoming
As unit 16 is received.Image-generating unit 16 receives from multiple coloured light of reflecting element 22 and is delivered to projection
Camera lens 18.Projection lens 18 is arranged between image-generating unit 16 and screen 12, will be from image-generating unit 16
Light project on screen 12.In optical digital computing (DLPTM) projector, filter unit 20 is
Colour wheel, image-generating unit 16 is digital minitype reflector (Digital Micromirror Device, DMD),
Reflecting element 22 is concave mirror.In liquid crystal projector, filter unit 20 is optical filter, and reflecting element 22 is
Mirror surface, and image-generating unit 16 is liquid crystal panel.
Refer to the part-structure schematic diagram of the projection arrangement 10 that Fig. 2, Fig. 2 are the embodiment of the present invention.Projection
Camera lens 18 comprises the first set of lenses 24 and the second set of lenses 26.First set of lenses 24 adjacent screen 12 is (i.e.
Thing side), the second set of lenses 26 is adjacent to image-generating unit 16 (i.e. image side).First set of lenses 24 has negative diopter
And in order to divergent rays.Second set of lenses 26 has positive diopter and in order to be polymerized light.First set of lenses 24
Comprise and there are negative dioptric first lens 28.Second set of lenses 26 comprises second lens with positive diopter
30 with there are negative dioptric 3rd lens 32.Second lens 30 and the 3rd lens 32 are not required to arrange spacer ring,
Imply that the second lens 30 can be connected to the 3rd lens 32.
3rd lens 32 preferably biconcave lens, is made by dense flint glass.Dense flint glass has height
Refractive index and the characteristic of high abbe number, be mainly used to eliminate the chromatic aberation of projection lens 18.3rd lens 32
Refraction coefficient preferably between 1.64 to 1.87, and the Abbe number of the 3rd lens 32 is preferably between 20
Between 35, to meet the material feature of dense flint glass, the 3rd lens 32 of the present invention generally use such as
The lens models such as S-TIH Yu S-TIM, are so not limited to this.
When projection arrangement 10 completes defocused, along with using time and metal chassis body expanded by heating, the 3rd saturating
Mirror 32 produces bigger heat variation, causes before at optimum solution picture, (best focus) moves to image-generating unit 16
(equivalence is burnt elongated after being read as), causes projection lens 18 out of focus.In order to compensate above-mentioned heat variation, this
Bright second lens 30 are arranged between the first lens 28 and the 3rd lens 32.Wherein second lens 30
Hot Mutation parameter is D0, refractive index is n, and-3.0 × e-5≤D0≤-6.0×e-7, n >=1.57.Hot Mutation parameter
D0Represent the rate of change that refractive index is affected by the temperature difference.Hot Mutation parameter D0Higher than the upper limit, the position of focusing becomes
Change amount is the least；Hot Mutation parameter D0The least then compensation effect is the best, but is limited to material behavior and limits, the present invention
Hot Mutation parameter D0It is preset as not less than-3.0 × e-5.The second lens 30 that the present invention is suitable for enumerated by table 1
Several types.
| Lens model | Refractive index (n) | Hot Mutation parameter (D0) |
| S-PHM52 | 1.618 | -1.02E-05 |
| S-PHM53 | 1.603 | -8.17E-06 |
| S-BAL3 | 1.57135 | -4.21E-06 |
| S-LAM3 | 1.717004 | -3.1827E-06 |
| S-NPH1 | 1.808095 | -3.17E-06 |
| S-BAL2 | 1.570989 | -3.14E-06 |
| S-FTM16 | 1.5927 | -2.67E-06 |
| S-LAL12 | 1.678 | -1.05E-06 |
| S-LAL54 | 1.651 | -6.57E-07 |
Table 1
The present embodiment is preferably carried out hot variation compensation by the second lens 30, but in some environments, if individually
The most as expected, also alternative additionally comprises the thermal compensation effect of a piece of second lens 30 in the second set of lenses 26
There are the 4th lens 34 and the 5th lens 36 of positive diopter, be separately positioned on the two ends of the 3rd lens 32
Face.4th lens 34 complementary can overcome the heat variation of projection arrangement 10.The lens of the second set of lenses 26
Quantity and each lens ametropia characteristic can be not limited to described in this embodiment, and end is depending on design requirement.All provide
The lens combination of polymerization light function comes under the invention category of the second set of lenses 26, in this no longer to having phase
With or the other embodiments elaborate of close light path characteristic.Each sphere that table 2 lists projection lens 18 is saturating
The preferable parameter value of mirror.In table 2, the value of " distance " represents the surface to next column, the surface of these row corresponding
Spacing, i.e. the spacing of this row minute surface and next column minute surface.
Table 2
Refer to Fig. 3 to Fig. 8.In each figure, arc curve projects corresponding to each specified point of image-generating unit 16
The solution of screen 12 is as result；The longitudinal axis represents resolving power (Resolving Power), numerical value the highest table resolving power
The best, 0.4 table " still can sufficient ", 0.5 table " good good ", 1 it is ideal value；Transverse axis represents
Out of focus (Focus shift/Defocus) distance, 0 is at image plane (image-generating unit 16) place；TS generation
Exterior heat makes a variation.Fig. 3 is the projection arrangement 10 of embodiment of the present invention simulation drawing before heat makes a variation, and Fig. 4 is this
Simulation drawing after 3rd lens 32 heat variation of inventive embodiments, Fig. 5 is the ray machine housing of the embodiment of the present invention
Simulation drawing after heat variation, Fig. 6 is the simulation drawing after the second lens 30 heat variation of the embodiment of the present invention, figure
7 is the simulation drawing after the 4th lens 34 heat variation of the embodiment of the present invention, and Fig. 8 is the throwing of the embodiment of the present invention
The image device 10 simulation drawing after hot variation compensation.
As it is shown on figure 3, the resolving power of the corresponding each specified point of projection arrangement 10 before heat variation is all well (0.5
Up and down), at optimum solution picture, (best focus, the crest of each arc curve) essence (becomes close to transverse axis initial point
As unit 16), now projection arrangement 10 has completed correctly to focus, can project and understand that image is to screen 12.
But, in the case of long-time use, in projection arrangement 10, each element can affect projection lens because of heat variation
The image quality of 18.As shown in Figure 4, the 3rd lens 32 of concave-concave are because of the characteristic generation of dense flint glass material
Bigger heat variation, at its optimum solution picture, (crest of each arc curve) moves toward left relative to transverse axis initial point
To image-generating unit 16.Furthermore, as it is shown in figure 5, ray machine metal shell thermal expansion also can reduce image quality,
Cause (crest of each arc curve) at optimum solution picture also can move to imaging list toward left relative to transverse axis initial point
Before unit 16.
In order to overcome the heat variation of projection arrangement 10, the present invention utilizes second lens 30 with positive diopter
Or revise above-mentioned heat variation with the 4th lens 34 again, imply that and mainly revised projection arrangement 10 by the second lens 30
Heat variation, and regard actual demand and choose whether to add the 4th lens 34 auxiliary correction is provided.As shown in Figure 6,
At second lens 30 optimum solution picture, (crest of each arc curve) can move toward right relative to transverse axis initial point；As
Shown in Fig. 7, at the 4th lens 34 optimum solution picture, (crest of each arc curve) also can be past relative to transverse axis initial point
Right is moved.Consequently, it is possible to have positive diopter, hot Mutation parameter D0Meet-3.0 × e-5≤D0≤-6.0×e-7、
And refractive index n to meet second lens 30 the 4th lens 34 of collocation tool similar characteristic (or again) of n >=1.57 permissible
Effective compensation the 3rd lens 32 and ray machine expand produced heat variation, as shown in Figure 8, make at optimum solution picture
(best focus, the crest of each arc curve) essence is close to transverse axis initial point (image-generating unit 16).Therefore,
User is not required to manual focusing projection arrangement 10 constantly, thereby simplifies operating procedure and improves projection quality.
Furthermore, the present invention preferably uses the projection lens 18 of non-telecentricity (non-telecentric) system.Table 3
Point out that the preferable focal length value of each optical element of the present invention, such as effective focal length f of projection lens 18 are 21.9mm,
The focal distance f 1 of the first lens 28 is-49.61mm, and the focal distance f 3 of the 3rd lens 32 is-13.343801mm,
And meet 1.5≤| f1 |/f≤3.6 and the condition of 0.3≤| f3 |/f≤0.9.If | f1 |/f, | f3 |/f ratio be less than lower limit, | f1 |,
| f3 | is the least, represents that the refractive power of lens is the strongest, is easily generated aberration.Throw additionally, ratio represents less than lower limit
The lens numbers of shadow camera lens 18 is more, and heat variation is relatively big, be not suitable for the enforcement aspect of the present invention.If | f1 |/f,
The ratio of | f3 |/f is higher than the upper limit, and | f1 |, | f3 | are the biggest, represents that the refractive power of lens is the most weak, then projection lens 18
Enlargement ratio low, do not meet consumer demand.
| f(mm) | f1(mm) | f3(mm) |
| 21.9 | -49.609652 | -13.343801 |
Table 3
All lens of the present invention the first set of lenses and the second set of lenses preferably use spherical mirror, the 3rd lens to make
Making of dense flint glass, be used for eliminating the chromatic aberation of projection lens, the refractive index of the second lens changes with the temperature difference
The ratio (hot Mutation parameter) become need to meet-3.0 × e-5≤D0≤-6.0×e-7Restriction, make the second lens may be used to
Compensate the 3rd lens and expand, with ray machine, the hot amount of variability produced.Compare prior art, the projection lens of the present invention
And dependent projections device has low cost and the advantage easily manufactured, and the projection demand for high brightness provides effect
The best hot variation compensation method.
The present invention is been described by by above-mentioned related embodiment, but above-described embodiment is only and implements the present invention's
Example.It must be noted that, the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, not
The change made in departing from the spirit and scope of the present invention and retouching, all belong to the scope of patent protection of the present invention.
Claims (10)
1. a projection lens, it is characterised in that include:
First set of lenses, has negative diopter and neighbouring thing side, and this first set of lenses comprises and has negative diopter
The first lens；And
Second set of lenses, has positive diopter and neighbouring image side, and this second set of lenses comprises and has positive diopter
The second lens with there are negative dioptric 3rd lens, these second lens are positioned at this first lens and the 3rd
Between lens, and the 3rd lens are made by dense flint glass material；
Wherein, the hot Mutation parameter of these the second lens is D0, and-3.0 × e-5≤D0≤-6.0×e-7；This projection
The focal length of camera lens is f, and the focal length of these the first lens is f1, and the focal length of the 3rd lens is f3, and
1.5≤| f1 |/f≤3.6,0.3≤| f3 |/f≤0.9.
2. projection lens as claimed in claim 1, it is characterised in that the refraction coefficient of the 3rd lens is situated between
Between 1.64 to 1.87, the Abbe number of the 3rd lens is between 20 to 35.
3. projection lens as claimed in claim 1, it is characterised in that the 3rd lens are biconcave lens.
4. projection lens as claimed in claim 1, it is characterised in that these second lens are connected to the 3rd
Lens.
5. projection lens as claimed in claim 1, it is characterised in that the refractive index of these the second lens is n,
And n >=1.57.
6. projection lens as claimed in claim 1, it is characterised in that this second set of lenses also comprises and has
4th lens of positive diopter and the 5th lens, be divided into the two sides of the 3rd lens.
7. a projection arrangement, is used for projecting image to screen, it is characterised in that this projection arrangement includes:
Light source, it is provided that light；
Image-generating unit, receives this light；And
Projection lens, is arranged between this image-generating unit and this screen, in order to project this light to this screen,
This projection lens comprises:
First set of lenses, has negative diopter and this screen neighbouring, this first set of lenses comprise have negative
Dioptric first lens；And
Second set of lenses, has positive diopter and this image-generating unit neighbouring, and this second set of lenses comprises tool
Having the second lens of positive diopter and have negative dioptric 3rd lens, it is first saturating that these second lens are positioned at this
Between mirror and the 3rd lens, and the 3rd lens are made by dense flint glass；
Wherein, the hot Mutation parameter of these the second lens is D0, and-3.0 × e-5≤D0≤-6.0×e-7；This projection
The focal length of camera lens is f, and the focal length of these the first lens is f1, and the focal length of the 3rd lens is f3, and
1.5≤| f1 |/f≤3.6,0.3≤| f3 |/f≤0.9.
8. projection arrangement as claimed in claim 7, it is characterised in that the refraction coefficient of the 3rd lens is situated between
Between 1.64 to 1.87, the Abbe number of the 3rd lens is between 20 to 35.
9. projection arrangement as claimed in claim 7, it is characterised in that these second lens are connected to the 3rd
Lens.
10. projection arrangement as claimed in claim 7, it is characterised in that the refractive index of these the second lens is n,
And n >=1.57.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410106010.3A CN103955046B (en) | 2014-03-20 | 2014-03-20 | Projection lens and projection arrangement |
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| CN201410106010.3A CN103955046B (en) | 2014-03-20 | 2014-03-20 | Projection lens and projection arrangement |
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| CN103955046B true CN103955046B (en) | 2016-09-07 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158883B (en) * | 2015-08-28 | 2018-04-17 | 苏州佳世达光电有限公司 | Projection lens and projection arrangement |
| US10983308B2 (en) * | 2016-10-19 | 2021-04-20 | Panasonic Intellectual Property Management Co., Ltd. | Imaging lens system and camera |
| CN108388006B (en) * | 2018-03-30 | 2023-06-16 | 浙江舜宇光学有限公司 | Optical system |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6195209B1 (en) * | 1999-05-04 | 2001-02-27 | U.S. Precision Lens Incorporated | Projection lenses having reduced lateral color for use with pixelized panels |
| CN102519975B (en) * | 2011-12-23 | 2013-06-12 | 哈尔滨工业大学 | Varifocal optical system for online detection of damages of optical elements |
| CN103376538B (en) * | 2012-04-23 | 2016-01-06 | 信泰光学(深圳)有限公司 | Zoom lens |
| CN103454756A (en) * | 2012-05-31 | 2013-12-18 | 苏州智能泰克有限公司 | Zoom projection lens |
| CN202975461U (en) * | 2012-12-07 | 2013-06-05 | 河北汉光重工有限责任公司 | Compact type continuous zooming optical lens with wide spectrum |
| CN103048772A (en) * | 2013-01-09 | 2013-04-17 | 南京波长光电科技有限公司 | Athermal lens |
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