CN103955046A - Projection lens and projection apparatus - Google Patents

Projection lens and projection apparatus Download PDF

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Publication number
CN103955046A
CN103955046A CN201410106010.3A CN201410106010A CN103955046A CN 103955046 A CN103955046 A CN 103955046A CN 201410106010 A CN201410106010 A CN 201410106010A CN 103955046 A CN103955046 A CN 103955046A
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China
Prior art keywords
lens
projection
image
focal length
diopter
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CN201410106010.3A
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Chinese (zh)
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CN103955046B (en
Inventor
林明坤
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Qisda Optronics Suzhou Co Ltd
Qisda Corp
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Qisda Optronics Suzhou Co Ltd
Qisda Corp
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Priority to CN201410106010.3A priority Critical patent/CN103955046B/en
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Abstract

The invention provides a projection lens. The projection lens comprises a first lens group and a second lens group, wherein the first lens group is provided with negative diopter, is adjacent to an object side and comprises a first lens with negative diopter; and the second lens group is provided with positive diopter, is adjacent to an image side and comprises a second lens with positive diopter and a third lens with negative diopter; the second lens is disposed between the first lens and the third lens; the third lens is made of a dense flint glass material; the thermal variation parameter of the second lens is D0, and -3.0*e<-5><=D0<=-6.0*e<-7>.

Description

Projection lens and projection arrangement
Technical field
The invention provides a kind of projection lens and projection arrangement, espespecially a kind of can auto-compensation because of projection lens and the projection arrangement of thermal change different (Thermal Shift) out of focus (Focus shift/Defocus).
Background technology
Common projector, in order to save cost, is often used non-spherical lens in projection lens on the market.Non-spherical lens is made by plastic cement material conventionally.Use a large amount of non-spherical lenses easily to cause the production yield of projection lens not good.In addition,, along with the brightness of projector improves, the non-spherical lens of plastic cement material can produce the defects such as the different and demoulding of thermal change.Wherein, thermal change different (Thermal Shift) refers to that projector completes defocused, temperature is along with rise service time, and the optical element that ray machine (Optical Engine) metal chassis produces thermal expansion and sets up the projection lens on it produces variations in refractive index and causes projection lens out of focus (Focus shift/Defocus), affects the image quality of projection lens.Therefore how to design a kind of projection lens of avoiding because of the different out of focus of thermal change, it is just the target of giving priority to of optical lens industry.
Summary of the invention
The invention provides a kind of can auto-compensation because of projection lens and the projection arrangement of the different out of focus of thermal change.
On the one hand, the invention provides a kind of projection lens, include:
First lens group, has negative diopter and contiguous thing side, and this first lens group comprises and has negative dioptric first lens; And
The second lens combination, there is positive diopter and contiguous as side, this second lens combination comprises second lens with positive diopter and has negative dioptric the 3rd lens, and these second lens are between this 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 D 0, and-3.0 * e -5≤ D 0≤-6.0 * e -7.
Preferably, the focal length of this projection lens is f, and the focal length of this 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.
Preferably, the refraction coefficient of the 3rd lens is between 1.64 to 1.87, and the Abbe number of the 3rd lens is between 20 to 35.
Preferably, the 3rd lens are biconcave lens.
Preferably, these second lens are connected to the 3rd lens.
Preferably, the refractive index of these the second lens is n, and n >=1.57.
Preferably, this second lens combination also comprises the 4th lens and the 5th lens with positive diopter, is divided into the two sides of the 3rd lens.
On the other hand, the present invention also provides a kind of projection arrangement, is used for projecting image to screen, and this projection arrangement includes:
Light source, provides light;
Image-generating unit, receives this light; And
Projection lens, is arranged between this image-generating unit and this screen, and in order to project this light to this screen, this projection lens comprises:
First lens group, has negative diopter and contiguous this screen, and this first lens group comprises and has negative dioptric first lens; And
The second lens combination, there is positive diopter and contiguous this image-generating unit, this second lens combination comprises second lens with positive diopter and has negative dioptric the 3rd lens, and these second lens are between this first lens 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 D 0, and-3.0 * e -5≤ D 0≤-6.0 * e -7.
Preferably, the focal length of this projection lens is f, and the focal length of this 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.
Preferably, the refraction coefficient of the 3rd lens is between 1.64 to 1.87, and the Abbe number of the 3rd lens is between 20 to 35.
Preferably, these second lens are connected to the 3rd lens.
Preferably, the refractive index of these the second lens is n, and n >=1.57.
Compare with prior art, the 3rd lens of projection lens of the present invention use dense flint glass to make, and are used for eliminating the chromatic aberation of projection lens, and the ratio (hot Mutation parameter) that the refractive index of the second lens changes with the temperature difference meets-3.0 * e -5≤ D 0≤-6.0 * e -7restriction, the hot amount of variability that makes the second lens expand and to produce in order to compensate the 3rd lens and ray machine, and then the different compensation method of thermal change providing for the projection demand of high brightness.
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 the embodiment of the present invention simulation drawing before thermal change is different;
Fig. 4 is the simulation drawing of the 3rd lens thermal change of the embodiment of the present invention after different;
Fig. 5 is the simulation drawing of the ray machine housing thermal change of the embodiment of the present invention after different;
Fig. 6 is the simulation drawing of the second lens thermal change of the embodiment of the present invention after different;
Fig. 7 is the simulation drawing of the 4th lens thermal change of the embodiment of the present invention after different;
Fig. 8 is the projection arrangement of the embodiment of the present invention simulation drawing after hot variation compensation.
Embodiment
For making that object of the present invention, structure, feature and function thereof are had to further understanding, hereby coordinate embodiment to be described in detail as follows.
Refer to Fig. 1, the schematic diagram of the projection arrangement 10 that Fig. 1 is the embodiment of the present invention.Projection arrangement 10 is used for projecting image to screen 12.Projection arrangement 10 comprises light source 14, image-generating unit 16, projection lens 18, filter unit 20 and reflecting element 22.Light source 14 output light, filter unit 20 receives light and light is filtered into a plurality of coloured light, and the light after filter unit 20 is processed is reflected element 22 reflections and is received by image-generating unit 16.Image-generating unit 16 receives from a plurality of coloured light of reflecting element 22 and is delivered to projection lens 18.Projection lens 18 is arranged between image-generating unit 16 and screen 12, by the ray cast from image-generating unit 16 to screen 12.At digit optical, process in (DLPTM) projector, filter unit 20 is colour wheel, and image-generating unit 16 is digital minitype reflector (Digital Micromirror Device, DMD), and reflecting element 22 is concave mirror.In liquid crystal projector, filter unit 20 is optical filters, and reflecting element 22 is mirror surfaces, and image-generating unit 16 is liquid crystal panels.
Refer to Fig. 2, the part-structure schematic diagram of the projection arrangement 10 that Fig. 2 is the embodiment of the present invention.Projection lens 18 comprises first lens group 24 and the second lens combination 26.First lens group 24 adjacent screens 12 (being thing side), the contiguous image-generating unit 16 (as side) of the second lens combination 26.First lens group 24 has negative diopter and in order to divergent rays.The second lens combination 26 has positive diopter and in order to polymerization light.First lens group 24 comprises and has negative dioptric first lens 28.The second lens combination 26 comprises second lens 30 with positive diopter and has negative dioptric the 3rd lens 32.The second lens 30 and the 3rd lens 32 do not need to arrange spaced ring, and meaning i.e. the second lens 30 can be connected to the 3rd lens 32.
The 3rd lens 32 are preferably biconcave lens, by dense flint glass, are made.Dense flint glass has the characteristic of high index of refraction and high abbe number, is mainly used to eliminate the chromatic aberation of projection lens 18.The refraction coefficient of the 3rd lens 32 is better between 1.64 to 1.87, and the Abbe number of the 3rd lens 32 is better between 20 to 35, to meet the material characteristics of dense flint glass, the 3rd lens 32 of the present invention use conventionally as lens models such as S-TIH and S-TIM, are so not limited to this.
When projection arrangement 10 completes defocused, along with service time metal chassis body expanded by heating, that the 3rd lens 32 produce larger thermal change is different, cause optimum solution picture place (best focus) to move to (it is elongated that equivalence is read as rear Jiao) before image-generating unit 16, cause projection lens 18 out of focus.Different in order to compensate above-mentioned thermal change, the present invention is arranged on the second lens 30 between first lens 28 and the 3rd lens 32.Wherein the hot Mutation parameter of the second lens 30 is D 0, refractive index is n, and-3.0 * e -5≤ D 0≤-6.0 * e -7, n>=1.57.Hot Mutation parameter D 0represent that refractive index is subject to the rate of change of temperature difference influence.Hot Mutation parameter D 0higher than the upper limit, the location variation of focusing is less; Hot Mutation parameter D 0less compensation effect is better, but is limited to material behavior restriction, hot Mutation parameter D of the present invention 0be preset as be not less than-3.0 * e -5.Table 1 is enumerated several models of the second lens 30 that the present invention is suitable for.
Lens model Refractive index (n) Hot Mutation parameter (D 0)
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 by the second lens 30 and carries out hot variation compensation, but under some environment, if the thermal compensation effect of a slice the second lens 30 is not as expected separately, also alternative separately comprises the 4th lens 34 and the 5th lens 36 with positive diopter in the second lens combination 26, is separately positioned on the both ends of the surface of the 3rd lens 32.It is different that the 4th lens 34 can complementaryly overcome the thermal change of projection arrangement 10.The lens numbers of the second lens combination 26 and each lens ametropia characteristic can be not limited to described in this embodiment, look closely design requirement and determine.All lens combinations that polymerization light function is provided all belong to the invention category of the second lens combination 26, in this, no longer to having other embodiment of identical or close light path characteristic, illustrate in detail.Table 2 has been enumerated the better parameter value of each spherical lens of projection lens 18.In table 2, the value of " distance " represents distance, the i.e. spacing of this row minute surface and next column minute surface between surface to the surface of next column of corresponding these row.
Table 2
Refer to Fig. 3 to Fig. 8.In each figure, the solution that arc curve projects screen 12 corresponding to image-generating unit 16 each specified points is as result; The longitudinal axis represents resolving power (Resolving Power), and the higher table resolving power of numerical value is better, and 0.4 table " still can sufficient ", 0.5 table " good good ", 1 are ideal value; Transverse axis represents out of focus (Focus shift/Defocus) distance, and 0 is place, picture plane (image-generating unit 16) place; TS represents that thermal change is different.Fig. 3 is the projection arrangement 10 of the embodiment of the present invention simulation drawing before thermal change is different, Fig. 4 is the simulation drawings of the 3rd lens 32 thermal changes of the embodiment of the present invention after different, Fig. 5 is the simulation drawing of the ray machine housing thermal change of the embodiment of the present invention after different, Fig. 6 is the simulation drawings of the second lens 30 thermal changes of the embodiment of the present invention after different, Fig. 7 is the simulation drawings of the 4th lens 34 thermal changes of the embodiment of the present invention after different, the simulation drawing of the projection arrangement 10 that Fig. 8 is the embodiment of the present invention after hot variation compensation.
As shown in Figure 3, the resolving power of projection arrangement 10 corresponding each specified points before thermal change is different is good (0.5 is upper and lower) entirely, optimum solution picture place (crest of best focus, each arc curve) essence approaches transverse axis initial point (image-generating unit 16), now projection arrangement 10 has completed correct focusing, can project and know that image is to screen 12.Yet the in the situation that of long-time use, in projection arrangement 10, each element can affect because thermal change is different the image quality of projection lens 18.As shown in Figure 4, the 3rd lens 32 of concave-concave are different because of the larger thermal change of the characteristic generation of dense flint glass material, and its optimum solution picture place (crest of each arc curve) moves to before image-generating unit 16 toward left with respect to transverse axis initial point.Moreover as shown in Figure 5, the thermal expansion of ray machine metal shell also can reduce image quality, cause optimum solution picture place (crest of each arc curve) also can move to before image-generating unit 16 toward left with respect to transverse axis initial point.
Different in order to overcome the thermal change of projection arrangement 10, utilization of the present invention has the second lens 30 of positive diopter or with the 4th lens 34, revises above-mentioned thermal change more different, whether meaning is mainly different by the thermal change of the second lens 30 correction projection arrangements 10, and depending on actual demand, select to add the 4th lens 34 to provide auxiliary and revise.As shown in Figure 6, the second lens 30 optimum solution picture places (crest of each arc curve) can be toward right-hand movement with respect to transverse axis initial point; As shown in Figure 7, the 4th lens 34 optimum solution picture places (crest of each arc curve) also can be toward right-hand movement with respect to transverse axis initial point.Thus, there is positive diopter, hot Mutation parameter D 0meet-3.0 * e -5≤ D 0≤-6.0 * e -7, and refractive index n meet second lens 30 (or the 4th lens 34 of the tool similar characteristic of arranging in pairs or groups again) of n>=1.57 can effective compensation the expand thermal change that produces of the 3rd lens 32 and ray machine different, as shown in Figure 8, make optimum solution picture place (crest of best focus, each arc curve) essence approach transverse axis initial point (image-generating unit 16).Therefore, manual focusing projection arrangement 10 when user does not take, the step that simplifies the operation by this also improves projection quality.
Moreover, the projection lens 18 of the non-heart far away of the better use of the present invention (non-telecentric) system.Table 3 is pointed out the better focal length value of each optical element of the present invention, for example the effective focal length f of projection lens 18 is 21.9mm, the focal distance f 1 of first lens 28 is-49.61mm, the focal distance f 3 of the 3rd lens 32 is-13.343801mm, and meet 1.5≤| f1|/f≤3.6 and 0.3≤| the condition of f3|/f≤0.9.If | f1|/f, | f3|/f ratio is lower than lower limit, | f1|, | f3| is less, represents that the refractive power of lens is stronger, easily produces aberration.In addition, ratio represents that lower than lower limit the lens numbers of projection lens 18 is more, thermal change different large, be not suitable for enforcement aspect of the present invention.If | f1|/f, | the ratio of f3|/f is higher than the upper limit, | f1|, | f3| is larger, represents that the refractive power of lens is more weak, and the enlargement ratio of projection lens 18 is low, does not meet consumer demand.
f(mm) f1(mm) f3(mm)
21.9 -49.609652 -13.343801
Table 3
The better use spherical mirror of all lens of first lens group of the present invention and the second lens combination, the 3rd lens use dense flint glass to make, be 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 need meet-3.0 * e -5≤ D 0≤-6.0 * e -7restriction, the hot amount of variability that makes the second lens expand and to produce in order to compensate the 3rd lens and ray machine.Compare prior art, projection lens of the present invention and dependent projections device have the low-cost advantage with easily manufacturing, and provide the respond well different compensation method of thermal change for the projection demand of high brightness.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment having disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.

Claims (12)

1. a projection lens, is characterized in that, includes:
First lens group, has negative diopter and contiguous thing side, and this first lens group comprises and has negative dioptric first lens; And
The second lens combination, there is positive diopter and contiguous as side, this second lens combination comprises second lens with positive diopter and has negative dioptric the 3rd lens, and these second lens are between this 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 D 0, and-3.0 * e -5≤ D 0≤-6.0 * e -7.
2. projection lens as claimed in claim 1, is characterized in that, the focal length of this projection lens is f, and the focal length of this 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.
3. projection lens as claimed in claim 1, is characterized in that, the refraction coefficient of the 3rd lens is between 1.64 to 1.87, and the Abbe number of the 3rd lens is between 20 to 35.
4. projection lens as claimed in claim 1, is characterized in that, the 3rd lens are biconcave lens.
5. projection lens as claimed in claim 1, is characterized in that, these second lens are connected to the 3rd lens.
6. projection lens as claimed in claim 1, is characterized in that, the refractive index of these the second lens is n, and n >=1.57.
7. projection lens as claimed in claim 1, is characterized in that, this second lens combination also comprises the 4th lens and the 5th lens with positive diopter, is divided into the two sides of the 3rd lens.
8. a projection arrangement, is used for projecting image to screen, it is characterized in that, this projection arrangement includes:
Light source, provides light;
Image-generating unit, receives this light; And
Projection lens, is arranged between this image-generating unit and this screen, and in order to project this light to this screen, this projection lens comprises:
First lens group, has negative diopter and contiguous this screen, and this first lens group comprises and has negative dioptric first lens; And
The second lens combination, there is positive diopter and contiguous this image-generating unit, this second lens combination comprises second lens with positive diopter and has negative dioptric the 3rd lens, and these second lens are between this first lens 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 D 0, and-3.0 * e -5≤ D 0≤-6.0 * e -7.
9. projection arrangement as claimed in claim 8, is characterized in that, the focal length of this projection lens is f, and the focal length of this 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.
10. projection arrangement as claimed in claim 8, is characterized in that, the refraction coefficient of the 3rd lens is between 1.64 to 1.87, and the Abbe number of the 3rd lens is between 20 to 35.
11. projection arrangements as claimed in claim 8, is characterized in that, these second lens are connected to the 3rd lens.
12. projection arrangements as claimed in claim 8, is characterized in that, the refractive index of these the second lens is n, and n >=1.57.
CN201410106010.3A 2014-03-20 2014-03-20 Projection lens and projection arrangement Active CN103955046B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105158883A (en) * 2015-08-28 2015-12-16 苏州佳世达光电有限公司 Projection lens and projection device
CN109791272A (en) * 2016-10-19 2019-05-21 松下知识产权经营株式会社 Taking lens system and camera
WO2019184367A1 (en) * 2018-03-30 2019-10-03 浙江舜宇光学有限公司 Optical system
CN116774409A (en) * 2023-08-25 2023-09-19 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
EP1181610A2 (en) * 1999-05-04 2002-02-27 U.S. Precision Lens Inc. Projection lenses having reduced lateral color for use with pixelized panels
CN103048772A (en) * 2013-01-09 2013-04-17 南京波长光电科技有限公司 Athermal 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
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
CN103376538A (en) * 2012-04-23 2013-10-30 信泰光学(深圳)有限公司 Zooming lens Zoom lens
CN103454756A (en) * 2012-05-31 2013-12-18 苏州智能泰克有限公司 Zoom projection lens

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1181610A2 (en) * 1999-05-04 2002-02-27 U.S. Precision Lens Inc. 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
CN103376538A (en) * 2012-04-23 2013-10-30 信泰光学(深圳)有限公司 Zooming lens 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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105158883A (en) * 2015-08-28 2015-12-16 苏州佳世达光电有限公司 Projection lens and projection device
CN109791272A (en) * 2016-10-19 2019-05-21 松下知识产权经营株式会社 Taking lens system and camera
CN109791272B (en) * 2016-10-19 2021-08-27 松下知识产权经营株式会社 Imaging lens system and camera
WO2019184367A1 (en) * 2018-03-30 2019-10-03 浙江舜宇光学有限公司 Optical system
CN116774409A (en) * 2023-08-25 2023-09-19 深圳爱图仕创新科技股份有限公司 Projection lens and lamp
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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