CN102890339B - Zooming projection lens for protection machine - Google Patents
Zooming projection lens for protection machine Download PDFInfo
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- CN102890339B CN102890339B CN201110200398.XA CN201110200398A CN102890339B CN 102890339 B CN102890339 B CN 102890339B CN 201110200398 A CN201110200398 A CN 201110200398A CN 102890339 B CN102890339 B CN 102890339B
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- lens
- zooming
- projection camera
- camera lens
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- 210000001747 pupil Anatomy 0.000 claims description 7
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- 230000007812 deficiency Effects 0.000 description 3
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- 201000009310 astigmatism Diseases 0.000 description 2
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Abstract
The invention relates to a zooming projection lens for a projection machine. The zooming projection lens comprises a first lens set, a second lens set and a third lens set, which are sequentially arranged from an object side to an image side; the first lens set, the second lens and the third lens set are respectively of negative refractive index, positive refractive index and positive refractive index; the first lens set comprises an aspherical lens; and the third lens set comprises an aspherical lens and an aperture diaphragm. According to the zooming projection lens for the protection machine provided by the invention, the relative aperture of the zooming projection lens is reduced, and the relative aperture of the zooming projection lens at the wide angle side is less than 2.1, on the other hand, the diameter of the aperture diaphragm is increased, so that the luminous efficiency of the projection machine is improved, and moreover, the aspherical lens is utilized, so that the lens aberration due to the widening of the aperture diaphragm is reduced.
Description
Technical field
The invention relates to a kind of Zooming-projection camera lens, refer to a kind of Zooming-projection camera lens for projector especially.
Background technology
Triniscope projection arrangement (Cathode Ray Tube in recent years, CRT) gradually replace by the more compact projection arrangement such as liquid crystal projection apparatus (Liquid Crystal Display), digital light processing projection device (Digital Light Processing, DLP).
Wherein, the chief ray (chief ray) of the non-telecentric system (Non-telecentric) of digital light processing projection device is not parallel with optical axis, the Zooming-projection camera lens of this non-telecentric system can omit a total internal reflection prism, to save the cost of Zooming-projection camera lens compared to the Zooming-projection camera lens of telecentric system.In addition, due to the chief ray of non-telecentric system and optical axis not parallel, be enter to inject Zooming-projection camera lens with an angle, cause projected picture to offset on the projection screen upward, meet the demand of front projection formula projector.
A kind of non-telecentric system front projection formula projector in the past, such as disclosed by TaiWan, China patent I288290 patent, be applicable to high-pressure sodium lamp light source, the aperture of the usual aperture diaphragm of the consideration in order to price is little, relative aperture (F-number) is then comparatively large, and usual relative aperture is greater than 2.4.
And due to recent various light source full-fledged, therefore, how providing a kind of is suitable for Different Light and can avoids the Zooming-projection camera lens of optical efficiency deficiency, is one of the Research Emphasis of relevant dealer at present.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect of the Zooming-projection camera lens optical efficiency deficiency of projector in prior art, provide a kind of be suitable for Different Light projector and the Zooming-projection camera lens of optical efficiency deficiency can be avoided.
The technical scheme that the present invention adopts for its technical matters of solution is, a kind of Zooming-projection camera lens for projector is provided, sequentially comprised to picture end by thing end: the first lens combination, the second lens combination, and the 3rd lens combination, be sequentially negative, positive, positive refractive index, this first lens combination comprises non-spherical lens, and the 3rd lens combination comprises non-spherical lens and aperture diaphragm, and this Zooming-projection camera lens is less than 2.1 at the relative aperture of wide-angle side.
Effect of the present invention is the relative aperture reducing this Zooming-projection camera lens, and the footpath of namely amplifying aperture diaphragm is wide, promotes the optical efficiency of projector, additionally by use non-spherical lens, reduces aperture diaphragm and widens and derivative aberration.
Accompanying drawing explanation
Fig. 1 is configuration schematic diagram, illustrates that the present invention is used for the first specific embodiment of the Zooming-projection camera lens of projector;
Fig. 2 is the spherical aberration diagram of this first specific embodiment wide-angle side;
Fig. 3 is the multiplying power chromatic aberation figure of this first specific embodiment wide-angle side;
Fig. 4 is the filed curvature figure of this first specific embodiment wide-angle side;
Fig. 5 is the distortion figure of this first specific embodiment wide-angle side;
Fig. 6 is the optical transfer function figure of this first specific embodiment wide-angle side;
Fig. 7 is that this first specific embodiment is looked in the distance the spherical aberration diagram of journey;
Fig. 8 is that this first specific embodiment is looked in the distance the multiplying power chromatic aberation figure of journey;
Fig. 9 is that this first specific embodiment is looked in the distance the filed curvature figure of journey;
Figure 10 is that this first specific embodiment is looked in the distance the distortion figure of journey;
Figure 11 is that this first specific embodiment is looked in the distance the optical transfer function figure of journey;
Figure 12 is configuration schematic diagram, illustrates that the present invention is used for the second specific embodiment of the Zooming-projection camera lens of projector; And
Figure 13 is configuration schematic diagram, illustrates that the present invention is used for the 3rd specific embodiment of the Zooming-projection camera lens of projector.
Embodiment
Aforementioned and other technology contents, feature and effect for the present invention, in the detailed description of several preferred embodiments of following cooperation accompanying drawing, can clearly present.
Before the present invention is described in detail, it should be noted that in the following description content, similar assembly represents with identical numbering.
Consult Fig. 1, the present invention is used for the preferred embodiment of the Zooming-projection camera lens of projector, the first lens combination 1, second lens combination 2 is sequentially comprised to picture end by thing end, and the 3rd lens combination 3, be sequentially negative, positive, positive refractive index, can effectively increase zoom ratio ratio by three lens combination of negative, positive, positive refractive index.
This first lens combination 1 sequentially comprises plastic aspheric lens 11, glass sphere biconcave lens 12 (biconcave) by thing end to picture end, and glass spherical convex lens 13, this non-spherical lens 11 is the moon concavees lens (negative meniscus) protruded towards thing end, by using non-spherical lens 11, effectively to reduce Zooming-projection camera lens overall length, revise the aberration of projection image, to reduce lens usage quantity.
This second lens combination 2 can comprise a slice or two panels glass spherical convex lens 21.
3rd lens combination 3 comprises the negative lens 31 and positive lens 32 that are engaged with each other, also comprise glass aspheric lenses 33 and aperture diaphragm 34 (aperture stop), by using non-spherical lens 33, effectively to reduce Zooming-projection camera lens overall length, revise the aberration of projection image, to reduce lens usage quantity.
This Zooming-projection camera lens is less than 2.1 at the relative aperture (F-number, F#) of wide-angle side, and the footpath of namely amplifying aperture diaphragm 34 is wide, promotes the optical efficiency of projector.
This Zooming-projection camera lens satisfies the following conditional expression:
1.20＜|ex/bf|＜1.36 (1)
2.0＜|f
1/f
W|＜2.45 (2)
1.5＜|f
2/f
W|＜2.7 (3)
2.1＜|f3/fw|＜4.6 (4)
3.1＜|f
L1/f
W|＜4.5 (5)
0.31＜|f
A/f
3|＜0.65 (6)
0.31＜|v
1/v
2|＜0.49 (7)
Ex is system exit pupil position, and bf is rear lens focus length, f
wfor this Zooming-projection camera lens is at the focal length of wide-angle side, f
1for the focal length of this first lens combination 1, f
2for the focal length of this second lens combination 2, f3 is the focal length of the 3rd lens combination 3, f
l1for the focal length of this non-spherical lens 11 in this first lens combination 1, f
afor the focal length of this non-spherical lens 33 in the 3rd lens combination 3, v
1for the abbe number of the negative lens 31 of the 3rd lens combination 3, v
2for the abbe number of the positive lens 32 of the 3rd lens combination 3.
By the formula of satisfying condition (1), Zooming-projection camera lens back focal length degree bf can be elongated further, improve the zoom ratio ratio of wide-angle side (Wild-Angle) to journey of looking in the distance (Telephoto).By the formula of satisfying condition (2) to conditional (6), can effectively reduce Zooming-projection camera lens overall length, and revise the aberration of projection image.By the formula of satisfying condition (7), the aberration of projection image can be revised.By the formula of satisfying condition (5) to conditional (7), the resolving power of this Zooming-projection camera lens can be promoted.And by the spacing between this first lens combination 1 and this second lens combination 2, and by back focal length degree bf, the phenomenon causing projection image's quality to reduce because of temperature variation can be compensated.
< first specific embodiment >
Table 1-1 is the various parameter of this Zooming-projection camera lens first specific embodiment.In this first specific embodiment, the convex lens 13 of this first lens combination 1 are moon convex lens 13 (postivemeniscus) protruded towards thing end, this second lens combination 2 comprises the glass sphere biconvex lens 21 that quantity is, 3rd lens combination 3 at this negative lens 31 that is engaged with each other, also comprise sphere biconvex lens 35 between positive lens 32 and this non-spherical lens 33, sequentially also comprises this aperture diaphragm 34, sphere biconcave lens 36 and towards picture end protrudes moon convex lens 37 from this non-spherical lens 33 towards picture end.
System exit pupil position ex is-37.6304 millimeters, and rear lens focus length bf is 31.0 millimeters, and this Zooming-projection camera lens is in the focal distance f of wide-angle side
wbe 21.05041 millimeters, this first lens combination 1 focal distance f
1for-51.6057 millimeters, this second lens combination 2 focal distance f
2be 52.8869 millimeters, the focal distance f of this non-spherical lens 11 in this first lens combination 1
l1for-88.4085 millimeters, the focal distance f of this non-spherical lens 33 in the 3rd lens combination 3
abe 33.5388 millimeters, the abbe number v of the negative lens 31 of the 3rd lens combination 3
1be the abbe number v of the positive lens 32 of the 30.13, three lens combination 3
2be 81.55, meet aforementioned condition formula (1) to (7).
In addition, relative aperture is sequentially 2.0,2.217,2.428 by wide-angle side, intermediateness, journey of looking in the distance, this Zooming-projection camera lens focal length is sequentially 21.5041 millimeters, 26.7915 millimeters, 32.0464 millimeters by wide-angle side, intermediateness, journey of looking in the distance, and aperture diaphragm 34 aperture is wide is 18.5 millimeters.
Aspheric surface can be represented by following condition formulae:
, as a reference point with surface vertices, D be along optical axis direction in height H position apart from the shift value of optical axis, K is tapering coefficient (conic coefficient), and C is the inverse of radius-of-curvature, E
4to E
16for order aspherical coefficients, the coefficient of the non-spherical lens 11,33 of this first lens combination 1 and the 3rd lens combination 3 is as shown in following table 1-2:
As shown in Figure 2, wherein pupil radius (pupil radius) is 5.6571 millimeters to this first specific embodiment spherical aberration when wide-angle side (longitudinal aberration) figure.Fig. 3 is multiplying power chromatic aberation figure (lateralcolor), and the highest imaging half height of the longitudinal axis is 13.85 millimeters.Fig. 4 is filed curvature (field curvature) figure of performance astigmatism, and the image space of surperficial differing heights, S represents meridional ray, and T represents sagittal ray, and horizontal ordinate is the distance that imaging point arrives desirable image planes, and ordinate is desirable image height.Fig. 5 is distortion (distortion) figure that aberration is distorted in performance, and performance lateral magnification, horizontal ordinate is the percent difference that imaging point arrives ideal image point, and ordinate is desirable image height.Fig. 6 is optical transfer function figure (MTF, modulationtransfer function), show the optical transfer function modulus (modulus of the OTF, optical transfer function) that corresponding spatial frequency (spatial frequency) changes.
When this first specific embodiment is visible long-range, spherical aberration diagram, multiplying power chromatic aberation figure, filed curvature figure, distortion figure, optical transfer function figure are sequentially Fig. 7 to Figure 11.
According to Fig. 2 to Figure 11, spherical aberration, multiplying power chromatic aberation, astigmatism, distortion aberration not serious, wherein, by Fig. 7 and Figure 11, can learn that this first specific embodiment has good optical resolution.
< second specific embodiment >
Table 2-1 is the various parameter of this Zooming-projection camera lens second specific embodiment.In this second specific embodiment, the convex lens 13 of this first lens combination 1 are biconvex lens 13 (biconvex), this second lens combination 2 comprises the glass sphere moon convex lens 21 that quantity is two, 3rd lens combination 3 is at this negative lens 31 that is engaged with each other, thoroughly also comprise this aperture diaphragm 34, sphere biconvex lens 35 ' between telescope direct 32 and this non-spherical lens 33, and sphere biconcave lens 36 '.
System exit pupil position ex is-42.0 millimeters, and rear lens focus length bf is 31.0 millimeters, and this Zooming-projection camera lens is in the focal distance f of wide-angle side
wbe 20.6285 millimeters, this first lens combination 1 focal distance f
1for-46.3177 millimeters, this second lens combination 3 focal distance f
2be 33.9912 millimeters, the focal distance f of this non-spherical lens 11 in this first lens combination 1
l1for-91.7393 millimeters, the focal distance f of this non-spherical lens 33 in the 3rd lens combination 3
abe 29.2617 millimeters, the abbe number v of the negative lens 31 of the 3rd lens combination 3
1be the abbe number v of the positive lens 32 of the 26.29, three lens combination 3
2be 81.55, meet aforementioned condition formula (1) to (7).
In addition, relative aperture is sequentially 2.023,2.212,2.404 by wide-angle side, intermediateness, journey of looking in the distance, this Zooming-projection camera lens focal length is sequentially 20.6285 millimeters, 25.7162 millimeters, 30.7785 millimeters by wide-angle side, intermediateness, journey of looking in the distance, and aperture diaphragm 34 aperture is wide is 16.2 millimeters.
The coefficient of the non-spherical lens 11,33 of this first lens combination 1 and the 3rd lens combination 3 is as shown in following table 2-2:
< the 3rd specific embodiment >
Table 3-1 is the various parameter of this Zooming-projection camera lens the 3rd specific embodiment.In this 3rd specific embodiment, the convex lens 13 of this first lens combination 1 are the plano-convex lens 13 protruded towards thing end, this second lens combination 2 comprises the glass spherical plano-convex lens 21 that quantity is, 3rd lens combination 3 is at this negative lens 31 that is engaged with each other, also comprise sphere biconvex lens 35 between positive lens 32 and this non-spherical lens 33 ", this aperture diaphragm 34, towards thing end protrudes sphere moon convex lens 36 ", and sphere biconcave lens 37 ".
System exit pupil position ex is-41.737 millimeters, and rear lens focus length bf is 31.0 millimeters, and this Zooming-projection camera lens is in the focal distance f of wide-angle side
wbe 23.4058 millimeters, this first lens combination 1 focal distance f
1for-48.0972 millimeters, this second lens combination 2 focal distance f
2be 50.4457 millimeters, the focal distance f of this non-spherical lens 11 in this first lens combination 1
l1for-73.0718 millimeters, the focal distance f of this non-spherical lens 33 in the 3rd lens combination 3
abe 25.5686 millimeters, the abbe number v of the negative lens 31 of the 3rd lens combination 3
1be the abbe number v of the positive lens 32 of the 30.13, three lens combination 3
2be 81.55, meet aforementioned condition formula (1) to (7).
In addition, relative aperture is sequentially 2.071,2.204,2.249 by wide-angle side, intermediateness, journey of looking in the distance, this Zooming-projection camera lens focal length is sequentially 23.4058 millimeters, 26.8620 millimeters, 28.0111 millimeters by wide-angle side, intermediateness, journey of looking in the distance, and aperture diaphragm 34 aperture is wide is 19.5 millimeters.
The coefficient of the non-spherical lens of this first lens combination and the 3rd lens combination is as shown in following table 3-2:
In sum, because recent LED is full-fledged, the advantages such as degree of stability is high, the life-span is long, cheap, make LED replace various light source gradually, and use LED as the projector of light source, brightness higher pressure mercury lamp is low, therefore, the present invention is wide by the footpath of amplifying aperture diaphragm 34, promotes the optical efficiency of projector, to be applicable to LED projection machine.
In addition, by using non-spherical lens 11,33, effectively to reduce Zooming-projection camera lens overall length, revise the aberration of projection image, to reduce lens usage quantity, therefore really object of the present invention can be reached.
The foregoing is only preferred embodiment of the present invention, can not limit scope of the invention process with this, namely all simple equivalences done according to the claims in the present invention and invention description content change and modify, and all still remain within the scope of the patent.
Claims (9)
1. for a Zooming-projection camera lens for projector, it is characterized in that, sequentially comprised to picture end by thing end:
First lens combination, the second lens combination, and the 3rd lens combination, be sequentially negative, positive, positive refractive index, this first lens combination comprises non-spherical lens, 3rd lens combination comprises non-spherical lens and aperture diaphragm, and this Zooming-projection camera lens is less than 2.1 at the relative aperture of wide-angle side;
This Zooming-projection camera lens meets:
1.20<|ex/bf|<1.36，
Ex is system exit pupil position, and bf is rear lens focus length.
2. the Zooming-projection camera lens for projector according to claim 1, is characterized in that, this Zooming-projection camera lens meets:
2.0<|f
1/f
W|<2.45，
F
1for the focal length of this first lens combination, f
wfor this Zooming-projection camera lens is at the focal length of wide-angle side.
3. the Zooming-projection camera lens for projector according to claim 1, is characterized in that, this Zooming-projection camera lens meets:
1.5<|f
2/f
W|<2.7，
F
2for the focal length of this second lens combination, f
wfor this Zooming-projection camera lens is at the focal length of wide-angle side.
4. the Zooming-projection camera lens for projector according to claim 1, is characterized in that, this Zooming-projection camera lens meets:
2.1<|f3/fw|<4.6，
F3 is the focal length of the 3rd lens combination, f
wfor this Zooming-projection camera lens is at the focal length of wide-angle side.
5. the Zooming-projection camera lens for projector according to claim 1, is characterized in that, this Zooming-projection camera lens meets:
3.1<|f
L1/f
W|<4.5，
F
l1for the focal length of this non-spherical lens in this first lens combination, f
wfor this Zooming-projection camera lens is at the focal length of wide-angle side.
6. the Zooming-projection camera lens for projector according to claim 5, is characterized in that, this first lens combination is sequentially made up of this non-spherical lens and two spherical lenses to picture end thing end.
7. the Zooming-projection camera lens for projector according to claim 1, is characterized in that, this Zooming-projection camera lens meets:
0.31<|f
A/f
3|<0.65，
F
afor the focal length of this non-spherical lens in the 3rd lens combination, f3 is the focal length of the 3rd lens combination.
8. the Zooming-projection camera lens for projector according to claim 7, is characterized in that, the 3rd lens combination also comprises the negative lens and positive lens that are engaged with each other, and this Zooming-projection camera lens meets:
0.31<|v
1/v
2|<0.49，
V
1for the abbe number of this negative lens, v
2for the abbe number of this positive lens.
9. the Zooming-projection camera lens for projector according to claim 8, is characterized in that, the 3rd lens combination is sequentially this negative lens, positive lens and this non-spherical lens by thing end to picture end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110200398.XA CN102890339B (en) | 2011-07-18 | 2011-07-18 | Zooming projection lens for protection machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110200398.XA CN102890339B (en) | 2011-07-18 | 2011-07-18 | Zooming projection lens for protection machine |
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| Publication Number | Publication Date |
|---|---|
| CN102890339A CN102890339A (en) | 2013-01-23 |
| CN102890339B true CN102890339B (en) | 2015-02-18 |
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|---|---|---|---|
| CN201110200398.XA Expired - Fee Related CN102890339B (en) | 2011-07-18 | 2011-07-18 | Zooming projection lens for protection machine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212727B (en) * | 2017-07-07 | 2021-04-06 | 中强光电股份有限公司 | Projector and projection lens |
| CN114089501B (en) * | 2020-08-25 | 2023-04-07 | 成都极米科技股份有限公司 | Optical lens for projection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004077950A (en) * | 2002-08-21 | 2004-03-11 | Canon Inc | Zoom lens |
| JP4366086B2 (en) * | 2003-01-30 | 2009-11-18 | 日東光学株式会社 | Projection lens system and projector apparatus |
| JP2005037727A (en) * | 2003-07-16 | 2005-02-10 | Sony Corp | Zoom lens and imaging device |
| JP4821121B2 (en) * | 2005-01-31 | 2011-11-24 | コニカミノルタオプト株式会社 | Wide-angle lens system |
| JP4222408B2 (en) * | 2006-11-06 | 2009-02-12 | セイコーエプソン株式会社 | Zoom lens and projector |
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