CN103064175B - Projection lens - Google Patents
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- CN103064175B CN103064175B CN201110325104.6A CN201110325104A CN103064175B CN 103064175 B CN103064175 B CN 103064175B CN 201110325104 A CN201110325104 A CN 201110325104A CN 103064175 B CN103064175 B CN 103064175B
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Abstract
A projection lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the enlargement side to the diminution side. Diopter of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is respectively negative, negative, positive, negative and positive. The diopter of the fourth lens is larger than that of the first lens and the second lens. Refractive index of the fourth lens is Nd and focal length of the fourth lens is f4. The focal length of fifth lens is f5. Due to the fact that the projection lens meets 0.45<|f4/ (f5*Nd)|<1.2, the projection lens has the advantages of being good in imaging quality and small in size.
Description
Technical field
The present invention relates to a kind of camera lens, and in particular to a kind of projection lens.
Background technology
With scientific-technical progress, Miniature projection lens (Pico Projection Lens) one of main flow becoming market gradually.Miniature projection lens principal market is positioned at portable personal electric product, and therefore low price also becomes important factor.In addition, the valuable feature of minitype projection machine is that light source makes the LED lamp source of environmental protection power saving into by traditional high-pressure sodium lamp (UHP).But wish again to possess high brightness while volume-diminished, therefore represent camera lens has less numerical aperture (F number), mostly generally is 2.4.In order to obtain higher luminous flux, numerical aperture must reduce, and wherein uses large aperture camera lens to be another effective method.But, aperture become large while eyeglass also relatively become large, and then cause aberration sharply to increase, therefore in optical design, degree of difficulty also just promotes greatly.In general, many patents typically use aspherical lens to correct aberration or to increase eyeglass, thus, just mutually can run counter to the target reducing cost.
In addition, Miniature projection lens is except having above-mentioned trend, and another emphasis is exactly short Jiao (ShortThrow Ratio).Meaning is namely at relatively short projector distance, and projectable goes out large picture.But large projected angle will make optical aberration increase considerably, in optical design, thus correct aberration also can become difficulty.
U.S. Patent Bulletin number No. 5933280 a kind of projection lens of exposure, it comprises five lens, first lens are aspheric surface, the second lens are aspheric surface, the 3rd lens are biconvex lens, the 4th lens are aspheric surface and the 5th lens are aspheric surface, and wherein the diopter of the 3rd lens is greater than dioptric more than 70% of whole optical system.In addition, lens use low dispersion high-refraction material to be customarily used in the projection lens of green picture, high dispersive high-refraction material then for red and blue projection lens.
U.S. Patent Bulletin number No. 7075622 a kind of projection lens of exposure, it comprises six lens, be sequentially the first negative lens, the second positive lens, the 3rd negative lens, the 4th negative lens, the 5th positive lens and the 6th positive lens, wherein the 4th lens and the 5th lens are balsaming lens 40.In addition, first lens and the second lens have eliminates the outer coma of axle, astigmatism and distortion, wherein suitably arranges the second lens, the 3rd lens and the 4th lens and the light entering the 4th lens can be made almost to be parallel to optical axis and to make the light entering the 4th lens can not have the generation of aberration.
U.S. Patent Bulletin number No. 6124978 a kind of projection lens of exposure, it is a Gaussian structures and comprises six lens, wherein these lens are sequentially the first lens of positive refractive index, the second lens of negative refractive index, the 3rd lens comprise negative refractive index lens and positive refractive index lens, the 4th lens of positive refractive index and the 5th lens of positive refractive index.Specifically, this structure can reach the object correcting the little and total length of optical texture of astigmatism, Numerical Aperture.
U.S. Patent Bulletin number No. 7679832 a kind of projection lens of exposure, it is made up of five lens.These lens are sequentially the second lens of the first lens, the just refractive index of negative refractive index, have the 3rd lens of positive refractive index, and the 3rd lens comprise the 4th lens of the lens of positive refractive index and the lens of negative refractive index and positive refractive index.This projection lens can reach the total length of optical texture, angle of visibility is wide and resolution is high advantage.
Summary of the invention
The present invention proposes a kind of projection lens, and it has the advantage of preferably image quality and small size.
Other object of the present invention and advantage can be further understood from the technical characteristic disclosed by the present invention.
For reaching above-mentioned one or part or all of object or other object, one embodiment of the invention provide a kind of projection lens, and it is made up of the first lens, the second lens, the 3rd lens, the 4th lens and the 5th lens.First lens, the second lens, the 3rd lens, the 4th lens and the 5th lens by Zoom Side to reduced side sequential.The diopter of the first lens, the second lens, the 3rd lens, the 4th lens and the 5th lens is respectively negative, negative, positive, negative, positive.The diopter of the 4th lens is greater than the diopter of the first lens and the second lens.In addition, the refractive index of the 4th lens is N
dand focal length is f
4, and the focal length of the 5th lens is f
5, wherein projection lens meets 0.45< │ f
4/ (f
5× N
d) │ <1.2.Wherein the curvature of the 4th lens near the surface of reduced side is different from the curvature of the 5th lens near the surface of Zoom Side, and the 3rd lens, the 4th lens and the 5th lens at least it two is non-spherical lens.
In an embodiment of the present invention, the focal length of the 3rd lens is f
3, and the distance of the 5th lens between the surface of reduced side to image processing elements is d
bF, wherein projection lens meets 0.45<d
bF/ f
3<1.3.
In an embodiment of the present invention, the first lens and the second lens at least respectively have a surface for aspheric surface.
In an embodiment of the present invention, at least it two respectively has a surface for aspheric surface for the 3rd lens, the 4th lens and the 5th lens.
In an embodiment of the present invention, the first lens and the second lens are respectively the meniscus convex surface facing Zoom Side.3rd lens are biconvex lens, and the 4th lens are biconcave lens, and the 5th lens are biconvex lens.
In an embodiment of the present invention, each surface of the first lens, the second lens, the 3rd lens and the 4th lens is aspheric surface.
In an embodiment of the present invention, the first lens are the meniscus convex surface facing Zoom Side, and the second lens are biconcave lens, and the 3rd lens are biconvex lens, and the 4th lens are biconcave lens, and the 5th lens are biconvex lens.
In an embodiment of the present invention, each surface of the first lens, the second lens, the 4th lens and the 5th lens is aspheric surface.
In an embodiment of the present invention, projection lens also comprises aperture diaphragm, and wherein aperture diaphragm is configured between the 3rd lens and the 4th lens.
In an embodiment of the present invention, the numerical aperture of projection lens drops between 2.2 and 2.0.
Based on above-mentioned, embodiments of the invention can reach at least one of following advantages or effect.By the spherical aberration that the 4th lens produce when large aperture to correct projection lens, so, good image projection can be presented under large aperture.In addition, projection lens also can simultaneously by meeting 0.45< │ f
4/ (f
5× N
d) │ <1.2, and the aberration produced when effectively can correct projection and then the projected picture that better quality can be provided.In addition, projection lens also can meet 0.45<d
bF/ f
3<1.3, when condition exceedes in limited time, back of the body focal length (Back Focal length, BF) relatively become large, cannot meet the condition of miniature (Compact), off-axis aberration is deteriorated rapidly simultaneously, when condition exceedes in limited time lower, BF diminishes relatively, easily produces the interference in mechanism and collision with illuminator, and easy generation peripheral light amount deficiency.
For above-mentioned feature and advantage of the present invention can be become apparent, multiple embodiment cited below particularly, and by reference to the accompanying drawings, be described in detail below.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the projection lens of one embodiment of the invention;
Fig. 2 A to Fig. 2 D and Fig. 3 is the image optics emulated data figure of the projection lens of Fig. 1;
Fig. 4 is the schematic diagram of the projection lens of another embodiment of the present invention;
Fig. 5 A to Fig. 5 D and Fig. 6 is the image optics emulated data figure of the projection lens of Fig. 4;
Embodiment
Aforementioned and other technology contents, feature and effect for the present invention, in the detailed description of the multiple embodiments below in conjunction with accompanying drawing, can clearly present.The direction term mentioned in following examples, such as " on ", D score, "front", "rear", "left", "right" etc., be only the direction with reference to accompanying drawing.Therefore, the direction term of use is used to illustrate, but not is used for limiting the present invention.
Fig. 1 is the schematic diagram of the projection lens of one embodiment of the invention.Please refer to Fig. 1, the projection lens 100 of the present embodiment comprises by Zoom Side to the first lens 110, second lens 120 of reduced side sequential, the 3rd lens 130, the 4th lens 140 and the 5th lens 150.The diopter of the first lens 110, second lens 120, the 3rd lens 130, the 4th lens 140 and the 5th lens 150 is respectively negative, negative, positive, negative, positive.In the present embodiment, the first lens 110 and the second lens 120 are all meniscus convex surface facing Zoom Side, the 3rd lens 130 are biconvex lens, the 4th lens 140 for biconcave lens and the 5th lens 150 be biconvex lens, as shown in Figure 1.
In addition, the diopter of the 4th lens 140 is greater than the diopter of the first lens 110 and the second lens 120, to correct the spherical aberration phenomenon that projection lens 100 produces when projecting, so, projection lens 100 is when carrying out wide-angle image projection, good image projection can be presented under short focus, as: high-resolution projected image.This means, the projection lens 100 of the present embodiment can utilize the 4th lens 140 to have the characteristic of larger refractive power to present preferably optical appearance.In addition, in the aberration phenomenon that rectification projection lens 100 produces when projecting, projection lens 100 can by meeting following condition formulae (), and the aberration produced when effectively can correct projection and then the projected picture that better quality can be provided.
0.45< │ f
4/ (f
5× N
d4) │ <1.2 ... conditional (one)
Wherein the refractive index of the 4th lens 140 is N
d4and focal length is f
4, and the focal length of the 5th lens 150 is f
5.
In addition, in order to projection lens 100 can be made, there is larger system aperture, namely less Numerical Aperture (F number), therefore the projection lens 100 of the present embodiment can under meeting above-mentioned conditional (one), and meet following condition formulae (two) simultaneously, so the numerical aperture of projection lens 100 can be made to drop between 2.2 and 2.0, even be less than 2.0.
0.45<d
bF/ f
3<1.3 ... conditional (two)
Wherein the focal length of the 3rd lens 130 is f
3, and the 5th lens 150 are d near the surperficial S10 of reduced side to the distance between image processing elements 160
bF.
Specifically, the 5th lens 150 are d near the surperficial S10 of reduced side to the distance between image processing elements 160
bFmeeting is d because of focusing
bFchange to some extent, therefore, d
bFmay be defined as projection lens 100 when rational projector distance is about 1M to 3M, back focal length when its focusing is known.In the present embodiment, if projection lens 100 meets d
bF/ f
3during >1.3, d
bFjust can relatively become large, and cannot meet the condition of miniature (Compact), off-axis aberration also can be deteriorated rapidly simultaneously; If projection lens 100 meets 0.45>d
bF/ f
3time, then easily and illuminator produce interference in mechanism and collision, and easily produce peripheral light amount deficiency.In other words, projection lens 100 can be f by the focal length suitably designing the 3rd lens 130
3with the distance d of the 5th lens 150 to image processing elements 160
bFbetween relation, and can effectively promote outside the quality of projected picture, and the advantage of volume microminiaturization can be had simultaneously.
In addition, in order to further improve the problem of projection lens 100 issuable coma (Coma), astigmatism (Astigmatism) or distort (Distortion) in time projecting, therefore, first lens 110 and the second lens 120 at least respectively have a surface for aspheric surface, wherein the present embodiment all adopts aspheric design, as the explanatory note in subsequent paragraph with the first lens 110 and respective two surfaces of the second lens 120.That is, the projection lens of the present embodiment can at least respectively have a surface for aspheric surface by making the first lens 110 and the second lens 120, and can eliminate the aberration outside optical axis.Moreover, because the projection lens 100 of the present embodiment can present larger projection angle, therefore the present embodiment can by by the 3rd lens 130, the 4th lens 140 and the 5th lens 150 at least its surface design of two be aspheric surface, to correct the distortion easily produced when projection lens 100 projects under short focus, wherein the present embodiment be with each surface of the first lens 110, second lens 120, the 3rd lens 130 and the 4th lens 140 for aspheric surface as an example.
Generally speaking, be positioned at reduced side and can be provided with above-mentioned image processing elements 160 (ImageProcessing Device).In the present embodiment, image processing elements 160 can be light valve (LightValve) or photo-sensitive cell.In addition, also configurable glass cover to protect image processing elements 160.In the present embodiment, projection lens 100 can make the image projection being positioned at reduced side to Zoom Side, to carry out image projection.
In addition, projection lens 100 also can comprise aperture diaphragm 170, and wherein aperture diaphragm 170 is configured between the 3rd lens 130 and the 4th lens 140, as shown in Figure 1.
Supplementary notes a bit, in time designing projection lens 100, do not limit projection lens 100 and need meet above-mentioned listed condition simultaneously, but the demand of optometry image quality, optionally meet above-mentioned listed condition.
Following content will enumerate an embodiment of projection lens 100.Should be noted, data listed in following table one are also not used to limit the present invention, any those skilled in the art, with reference to after the present invention, do suitable change when applying principle of the present invention to its parameter or setting, precisely because must belong in category of the present invention.
Table one
| f 3 | 18.349 |
| f 4 | -15.173 |
| f 5 | 11.428 |
| d BF | 16.15 |
| │f 4/(f 5×N d4)│ | 0.72 |
| d BF/f 3 | 0.88 |
In Table 1, spacing refers to the air line distance between two adjacently situated surfaces on the optical axis A of projection lens 100, for example, and the spacing of surperficial S1, the air line distance namely between surperficial S1 to surperficial S2 on optical axis A.Thickness in remarks column corresponding to each lens, refractive index and Abbe number please refer to the numerical value that in same column, each spacing, refractive index are corresponding with Abbe number.In addition, in table two, surface S1, S2 are two surfaces of the first lens 110, surface S3, S4 are two surfaces of the second lens 120, wherein S3 surface because aspheric design be related to that this surface is essentially convex surface, surface S5, S6 are two surfaces of the 3rd lens 130, and surperficial S7, S8 are two surfaces of the 4th lens 140, and surperficial S9, S10 are two surfaces of the 5th lens 150.There is the parameter value such as radius-of-curvature, spacing about each surface, please refer to table one, no longer repeat at this.
In addition, above-mentioned surperficial S1 ~ S8 is even item aspheric surface, and its available following formula represents:
In formula, Z is the side-play amount (Sag) in optical axis A direction, c is the inverse of the radius of osculating sphere (Osculating Sphere), namely close to the inverse of the radius-of-curvature (radius-of-curvature as S1, S2 in table two) at optical axis A place.K is quadric surface coefficient (Conic), and r is aspheric surface height, is the height toward rims of the lens from lens center, and A
2, A
4, A
6, A
8, A
10, A
12, A
14... be asphericity coefficient (Aspheric Coefficient), coefficient A2 is 0 in the present embodiment.Listed by lower list two is the aspheric surface parameter value of surperficial S1 ~ S8.
Table two
| Aspheric surface parameter | Quadric surface coefficient k | Coefficient A 4 | Coefficient A 6 | Coefficient A 8 |
| S1 | 4.4803 | 5.1647E-5 | -1.1645E-7 | 2.7073E-10 |
| S2 | 0.4010 | 3.9936E-5 | -1.3059E-7 | -4.8232E-10 |
| S3 | -999.7554 | 2.3672E-4 | -1.9173E-5 | 3.1797E-7 |
| S4 | -6.2457 | 1.9143E-3 | -5.7178E-5 | 8.6673E-7 |
| S5 | -1.5451 | 1.5520E-4 | 2.8276E-8 | -3.3000E-9 |
| S6 | -10.6950 | -3.6392E-5 | 3.4163E-6 | -4.8183E-8 |
| S7 | -30.0000 | 2.7325E-4 | -7.7020E-5 | 3.9418E-6 |
| S8 | -1.7216 | 3.2808E-4 | -5.7597E-5 | 2.5478E-6 |
Fig. 2 A to Fig. 2 D and Fig. 3 is the image optics emulated data figure of the projection lens of Fig. 1.Specifically, Fig. 2 A is the simulation figure of spherical aberration (Spherical Aberration), wherein Fig. 2 A be with the light of two kinds of different wave lengths (being respectively 460nm, 550nm) simulate out.Fig. 2 B is the simulation figure of astigmatism (Astigmatism), wherein Fig. 2 B be with the light of two kinds of different wave lengths (being respectively 460nm, 550nm) simulate out.Fig. 2 C be distortion (Distortion) simulation figure, wherein Fig. 2 C be with the light of a kind of wavelength (as: 680nm) simulate out.Fig. 2 D is the simulation figure of lateral chromatic aberration, and Fig. 2 D be with the light of a kind of wavelength (as: 550nm) simulate out.In addition, Fig. 3 be light fan map analysis (Ray Fan) simulation figure, wherein Fig. 3 be with the light of three kinds of different wave lengths (being respectively 460nm, 550nm, 680nm) simulate out.The figure gone out shown by Fig. 2 A to Fig. 2 D and Fig. 3, all in the scope of standard, can verify that the projection lens 100 of the present embodiment can have good quality of optical imaging really thus.
Fig. 4 is the schematic diagram of the projection lens of another embodiment of the present invention.Please also refer to Fig. 1 and Fig. 4, the projection lens 200 of the present embodiment adopts similar concept and structure to aforesaid projection lens 100.Specifically, the first lens 210 are the meniscus convex surface facing Zoom Side, and the second lens 220 are the meniscus convex surface facing Zoom Side, and the 3rd lens 230 are biconvex lens, and the 4th lens 240 are biconcave lens, and the 5th lens 250 are biconvex lens.In the present embodiment, each surface of the first lens 210, second lens 220, the 4th lens 240 and the 5th lens 250 is aspheric surface, and namely to meaning the first lens 210, second lens 220, the 4th lens 240 and the 5th lens 250 adopt non-spherical lens.
In projection lens 200, diopter due to the 4th lens 240 is also greater than the diopter of the first lens 210 and the second lens 220, and projection lens 200 also meets aforementioned condition formula () or conditional (two), therefore, the projection lens 200 of the present embodiment also has advantage mentioned by above-mentioned projection lens 100 and effect.
Similarly, in order to further improve the problem of projection lens 200 issuable coma (Coma), astigmatism (Astigmatism) or distort (Distortion) in time projecting, therefore, first lens 210 and the second lens 220 at least respectively have a surface for aspheric surface, wherein the present embodiment all adopts aspheric design, as the explanatory note in subsequent paragraph with the first lens 210 and the second the two-sided of lens 220.That is, the projection lens of the present embodiment can at least respectively have a surface for aspheric surface by making the first lens 210 and the second lens 220, and can eliminate the aberration outside optical axis.Moreover, because the projection lens 200 of the present embodiment can present larger projection angle, therefore the present embodiment can by by the 3rd lens 230, the 4th lens 240 and the 5th lens 250 at least its two surface design be aspheric surface, to correct the distortion easily produced when projection lens 200 projects under short focus, wherein the present embodiment be with each surface of the first lens 210, second lens 220, the 4th lens 240 and the 5th lens 250 for aspheric surface as an example.
Following content will enumerate an embodiment of projection lens 200.Should be noted, data listed in following table three are also not used to limit the present invention, any those skilled in the art are after reference the present invention, and do suitable change when applying principle of the present invention to its parameter or setting, it must belong in category of the present invention.
Table three
| f 3 | 21.127 |
| f 4 | -13.984 |
| f 5 | 8.913 |
| d BF | 16.62 |
| │f 4/(f 5×N d4)│ | 0.961 |
| d BF/f 3 | 0.787 |
In table three, spacing refers to the air line distance between two adjacently situated surfaces on the optical axis A of projection lens 200, for example, and the spacing of surperficial S1, the air line distance namely between surperficial S1 to surperficial S2 on optical axis A.Thickness in remarks column corresponding to each lens, refractive index and Abbe number please refer to the numerical value that in same column, each spacing, refractive index are corresponding with Abbe number.In addition, in table three, surperficial S1, S2 are two surfaces of the first lens 210, surface S3, S4 are two surfaces of the second lens 220, surface S5, S6 are two surfaces of the 3rd lens 230, and surperficial S7, S8 are two surfaces of the 4th lens 240, and surperficial S9, S10 are two surfaces of the 5th lens 250.There is the parameter value such as radius-of-curvature, spacing about each surface, please refer to table four, no longer repeat at this.
In addition, above-mentioned surperficial S1 ~ S4, S7 ~ S10 are even item aspheric surface, and its available following formula represents:
In formula, Z is the side-play amount (Sag) in optical axis A direction, c is the inverse of the radius of osculating sphere (Osculating Sphere), namely close to the inverse of the radius-of-curvature (radius-of-curvature as S1, S2 in table two) at optical axis A place.K is quadric surface coefficient (Conic), and r is aspheric surface height, is the height toward rims of the lens from lens center, and A
2, A
4, A
6, A
8, A
10, A
12, A
14... be asphericity coefficient (Aspheric Coefficient), coefficient A2 is 0 in the present embodiment.Listed by lower list two is the aspheric surface parameter value of surperficial S1 ~ S4, S7 ~ S10.
Table four
Fig. 5 A to Fig. 5 D and Fig. 6 is the image optics emulated data figure of the projection lens of Fig. 4.Specifically, Fig. 5 A is the simulation figure of spherical aberration (Spherical Aberration), wherein Fig. 5 A be with the light of two kinds of different wave lengths (being respectively 460nm, 550nm) simulate out.Fig. 5 B is the simulation figure of astigmatism (Astigmatism), wherein Fig. 5 B be with the light of two kinds of different wave lengths (being respectively 460nm, 550nm) simulate out.Fig. 5 C be distortion (Distortion) simulation figure, wherein Fig. 5 C be with the light of a kind of wavelength (as: 680nm) simulate out.Fig. 5 D is the simulation figure of lateral chromatic aberration, and Fig. 5 D be with the light of a kind of wavelength (as: 550nm) simulate out.In addition, Fig. 6 be light fan map analysis (Ray Fan) simulation figure, wherein Fig. 3 be with the light of three kinds of different wave lengths (being respectively 460nm, 550nm, 680nm) simulate out.The figure gone out shown by Fig. 5 A to Fig. 5 D and Fig. 6, all in the scope of standard, can verify that the projection lens 200 of the present embodiment can have good quality of optical imaging really thus.
In sum, projection lens of the present invention at least has the following advantages.First, by the refractive power making the refractive power of the 4th lens be greater than the first lens and the second lens, the spherical aberration phenomenon that the characteristic that the projection lens of meaning and the present embodiment can utilize the 4th lens to have larger refractive power produces when projecting in order to correct projection lens, so, projection lens, when carrying out wide-angle image projection, can present good image projection under short focus.In addition, projection lens also can simultaneously by meeting 0.45< │ f
4/ (f
5× N
d4) │ <1.2, and the aberration produced when effectively can correct projection and then the projected picture that better quality can be provided.In addition, projection lens also can meet 0.45<d
bF/ f
3<1.3, and obtain larger system aperture, namely less Numerical Aperture (F number).Moreover, also by suitably selecting the first lens, the second lens, the 3rd lens, the 4th lens and the 5th lens, at least it four respectively has a surface for aspheric surface, and can improve the problem of projection lens issuable coma (Coma), astigmatism (Astigmatism) or distortion (Distortion) in time projecting.
As described above, be only the preferred embodiments of the present invention, when not limiting scope of the invention process with this, the simple equivalence namely generally done according to the claims in the present invention and invention description content changes and modifies, and all still remains within the scope of the patent.In addition, any embodiment of the present invention or claim must not reach whole object disclosed by the present invention or advantage or feature.In addition, summary part and title are only used to the use of auxiliary patent document search, are not used for limiting interest field of the present invention.In addition, the first lens mentioned in instructions, the second lens ... Deng term, only in order to represent the title of element, be not used for the quantitative upper limit of limiting element or lower limit.
Claims (10)
1. a projection lens, be made up of the first lens, the second lens, the 3rd lens, the 4th lens and the 5th lens, described first lens, described second lens, described 3rd lens, described 4th lens and described 5th lens by Zoom Side to reduced side sequential, and the diopter of described first lens, described second lens, described 3rd lens, described 4th lens and described 5th lens is respectively negative, negative, positive, negative, positive, the diopter of described 4th lens is greater than the diopter of described first lens and described second lens
The refractive index of wherein said 4th lens is N
d4and focal length is f
4, the focal length of described 5th lens is f
5, described projection lens meets 0.45< │ f
4/ (f
5× N
d4) │ <1.2,
The curvature of wherein said 4th lens near the surface of reduced side is different from the curvature of described 5th lens near the surface of Zoom Side, and described 3rd lens, described 4th lens and described 5th lens at least it two is non-spherical lens.
2. projection lens as claimed in claim 1, the focal length of wherein said 3rd lens is f
3, the distance of described 5th lens between the surface of described reduced side to image processing elements is d
bF, described projection lens meets 0.45<d
bF/ f
3<1.3.
3. projection lens as claimed in claim 1, wherein said first lens and described second lens at least respectively have a surface for aspheric surface.
4. projection lens as claimed in claim 1, at least it two respectively has a surface to be aspheric surface for wherein said 3rd lens, described 4th lens and described 5th lens.
5. projection lens as claimed in claim 1, wherein said first lens and described second lens are respectively the meniscus convex surface facing described Zoom Side, described 3rd lens are biconvex lens, and described 4th lens are biconcave lens, and described 5th lens are biconvex lens.
6. projection lens as claimed in claim 5, each surface of wherein said first lens, described second lens, described 3rd lens and described 4th lens is aspheric surface.
7. projection lens as claimed in claim 1, wherein said first lens are the meniscus convex surface facing described Zoom Side, and described second lens are biconcave lens, and described 3rd lens are biconvex lens, described 4th lens are biconcave lens, and described 5th lens are biconvex lens.
8. projection lens as claimed in claim 7, each surface of wherein said first lens, described second lens, described 4th lens and described 5th lens is aspheric surface.
9. projection lens as claimed in claim 1, also comprises:
Aperture diaphragm, is configured between described 3rd lens and the 4th lens.
10. projection lens as claimed in claim 1, the numerical aperture of wherein said projection lens drops between 2.2 and 2.0.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110325104.6A CN103064175B (en) | 2011-10-24 | 2011-10-24 | Projection lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110325104.6A CN103064175B (en) | 2011-10-24 | 2011-10-24 | Projection lens |
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| CN103064175B true CN103064175B (en) | 2015-03-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI484211B (en) | 2013-12-18 | 2015-05-11 | 玉晶光電股份有限公司 | Camera device and optical imaging lens thereof |
| CN103969798B (en) * | 2013-12-18 | 2017-06-06 | 玉晶光电(厦门)有限公司 | Camera head and its optical imaging lens |
| CN105911678B (en) * | 2014-05-13 | 2019-03-19 | 苏州佳世达光电有限公司 | Projection arrangement |
| KR102117514B1 (en) | 2015-11-26 | 2020-06-01 | 삼성전기주식회사 | Optical Imaging System |
| TWI623773B (en) * | 2016-06-02 | 2018-05-11 | Calin Technology Co Ltd | Fixed focus projection lens |
| CN106324808B (en) * | 2016-11-08 | 2019-04-30 | 成都奥晶科技有限责任公司 | 5 chip ball-screen projection camera lenses of one kind and system |
| TWI721211B (en) * | 2017-09-08 | 2021-03-11 | 揚明光學股份有限公司 | Lens and projection device using the same |
| JP7416636B2 (en) * | 2020-01-28 | 2024-01-17 | 東京晨美光学電子株式会社 | imaging lens |
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359087B (en) * | 2007-08-02 | 2010-06-02 | 鸿富锦精密工业（深圳）有限公司 | Wide-angle lens and vehicle apparatus using the wide-angle lens |
| CN101726833B (en) * | 2008-10-10 | 2011-06-08 | 鸿富锦精密工业（深圳）有限公司 | Projection lens |
| JP5522988B2 (en) * | 2009-07-08 | 2014-06-18 | キヤノン株式会社 | Zoom lens and imaging apparatus using the same |
| TW201113553A (en) * | 2009-10-13 | 2011-04-16 | Young Optics Inc | Fixed-focus lens |
| CN102062933A (en) * | 2009-11-13 | 2011-05-18 | 中强光电股份有限公司 | Zoom lens |
| JP5653165B2 (en) * | 2009-12-22 | 2015-01-14 | キヤノン株式会社 | Zoom lens |
| CN102221767A (en) * | 2011-06-29 | 2011-10-19 | 苏州佳世达光电有限公司 | Projector |
-
2011
- 2011-10-24 CN CN201110325104.6A patent/CN103064175B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN103064175A (en) | 2013-04-24 |
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