CN105242379A - Imaging lens system - Google Patents
Imaging lens system Download PDFInfo
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- CN105242379A CN105242379A CN201410289696.4A CN201410289696A CN105242379A CN 105242379 A CN105242379 A CN 105242379A CN 201410289696 A CN201410289696 A CN 201410289696A CN 105242379 A CN105242379 A CN 105242379A
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Abstract
The invention provides an imaging lens system, which sequentially comprises a first lens, a second lens and a third lens from an object side to an image side, and is characterized in that the first lens has positive refractive power; the second lens has negative refractive power; and the third lens has positive refractive power or negative refractive power. A view angle theta meets the condition that an absolute value of tan(theta) is greater than 0.7 and less than 1.5.
Description
Technical field
The present invention relates to imaging lens system.
Background technology
Use such as charge-coupled device (CCD) (chargecoupleddevice, CCD) or the camera of the solid state image sensor such as complementary metal oxide semiconductor (CMOS) (complementarymetaloxidesemiconductor, CMOS) imageing sensor popularize rapidly.
In order to improve the resolution of camera, the degree of integration of pixel of solid state image sensor must be improved.And along with camera becomes less and lighter owing to being built into the raising of the performance of lens optical device wherein, camera is just extensively integrated in various mobile device.
In the lens optical device comprised in these cameras, when the quantity of camera lens increases, desired performance can be obtained; But the quantity increasing camera lens is not suitable for the small-sized and light-duty camera of lower cost.Therefore, the design being applicable to the desired performance obtaining small-sized and light-duty camera is necessary.
In this lens design, use the method by using two to four camera lenses to realize fixed focus lens system just widely, and consider that the specification of advantage under each situation and desired performance is to determine the structure of individual lenses.For example, if use two camera lenses, so because the size of pixel reduces, therefore possibly cannot aberration correction fully.If use four camera lenses, so can aberration correction fully, but the total length of lens system increases.
Therefore, the various designs by using a small amount of camera lens (that is, two to four camera lenses) to meet desired specification (such as, focal length, visual angle and aberration correction) are just being proposed.
Summary of the invention
The invention provides a kind of imaging lens system comprising three camera lenses.
According to an aspect of the present invention, provide a kind of imaging lens system, sequentially comprise to plane of delineation side from thing side: the first camera lens, has positive refractive power; Second camera lens, has negative refractive power; And three-lens, have positive refractive power or negative refractive power, wherein view angle theta meets the following conditions, 0.7 < | tan θ | and < 1.5.
Imaging lens system can also meet the following conditions: 4.8 < f/D1 < 5.0,
Wherein f represents the focal length of described imaging lens system, and D1 is the semiaperture of described first camera lens at described thing side place.
Imaging lens system can also meet the following conditions: 0.7 < TTL/f < 1.2,
Wherein TTL represents the distance from the thing side surface of described first camera lens to the described plane of delineation, and f represents the focal length of described imaging lens system.
Imaging lens system can also meet the following conditions: 0.7 < TTL/f < 1.2,
Wherein TTL represents the distance from the thing side surface of described first camera lens to the described plane of delineation, and f represents the focal length of described imaging lens system.
Imaging lens system can also meet the following conditions: 1.95 < D1/D3 < 1.5,
Wherein D1 represents the semiaperture of described first camera lens at described thing side place, and D3 represents the semiaperture of the described three-lens at described plane of delineation side place.
Described second camera lens can have minimum semiaperture in described first camera lens, described second camera lens and described three-lens.
Described first camera lens can have the convex meniscus shape to described thing side.
Described second camera lens can have bi-concave shape.
Described three-lens can have the convex meniscus shape to described plane of delineation side.
Described first camera lens can have at least one aspheric surface.
Described second camera lens can have at least one aspheric surface.
Described three-lens can have at least one aspheric surface.
Described first camera lens, described second camera lens and described three-lens can be formed by plastic material.
Diaphragm can be arranged between described first camera lens and described second camera lens.
Saturating infrared ray (IR) optical filter can be arranged on described between three-lens and the plane of delineation.
According to a further aspect in the invention, a kind of imaging device is provided, comprises: imaging lens system as above; And imageing sensor, for the optical imagery formed by described imaging lens system is converted to electric signal.
According to describing above, the configurable imaging lens system with excellent optical performance and small-sized and light-duty structure, and imaging lens system can be used for having and is converted in the various imaging devices of the imageing sensor of electric signal by the optical imagery formed by imaging lens system.
Accompanying drawing explanation
Fig. 1 is that it is graphic to show according to the optical arrangement of the imaging lens system of one embodiment of the invention.
Fig. 2 is the aberration diagram of the spherical aberration of showing on the longitudinal direction of imaging lens system according to an embodiment of the invention, field curvature and distortion.
Fig. 3 is the graphic of the optical arrangement of the imaging lens system shown according to another embodiment of the present invention.
Fig. 4 is the aberration diagram of spherical aberration on the longitudinal direction of the imaging lens system of exploded view 3, field curvature and distortion.
Fig. 5 is the graphic of the optical arrangement of the imaging lens system shown according to another embodiment of the present invention.
Fig. 6 is the aberration diagram of spherical aberration on the longitudinal direction of the imaging lens system of exploded view 5, field curvature and distortion.
[main element label declaration]
100: the first camera lenses
200: the second camera lenses
300: the three-lens
400: infrared ray (IR) optical filter thoroughly
IMG: the plane of delineation
OBJ: thing
ST: diaphragm
Embodiment
Hereinafter, will by explaining that the preferred embodiments of the present invention describe the present invention in detail referring to accompanying drawing.In figure, identical reference numbers represents similar components.
Fig. 1, Fig. 3 and Fig. 5 are show imaging lens system according to an embodiment of the invention graphic.
Referring to Fig. 1, Fig. 3 and Fig. 5, imaging lens system comprises: the first camera lens 100, has positive refractive power; Second camera lens 200, has negative refractive power; And three-lens 300, have positive refractive power or negative refractive power, the first camera lens 100, second camera lens 200 and three-lens 300 are sequentially arranged from thing OBJ side to plane of delineation IMG side.
The view angle theta of imaging lens system meets the following conditions.
0.7＜|tanθ|＜1.5(1)
The visual angle of above-mentioned condition (1) definition imaging lens system.In the scope being greater than the upper limit, spherical aberration and coma aberration (comaaberration) increase.In the scope being less than lower limit, spherical aberration and coma aberration reduce, and visual angle excessively reduces.
Imaging lens system can also meet the following conditions.
4.8＜f/D1＜5.0(2)
Herein, f represents the focal length of imaging lens system, and D1 is the semiaperture of first camera lens 100 at thing side place.
Condition (2) relates to the semiaperture of the first camera lens 100.Condition (2) restriction, closest to the semiaperture of the first camera lens 100 of thing side, to guarantee optical path, and guarantees the thickness of the edge of the second camera lens 200 and three-lens 300.
Imaging lens system can also meet the following conditions.
0.7＜TTL/f＜1.2(3)
Herein, TTL represents the total length of imaging lens system, that is, the distance from the thing side surface of the first camera lens 100 to plane of delineation IMG, and f represents the focal length of imaging lens system.
Above-mentioned condition (3) is the condition for the spherical aberration correction function and compact size realizing imaging lens system.When in greater than condition (3) upper in limited time, can easy correcting spherical aberration; But the total length of imaging lens system becomes long.On the other hand, in TTL/f less-than condition (3) on duty lower in limited time, imaging lens system becomes compact; But be difficult to correcting spherical aberration.
Imaging lens system can also meet the following conditions.
0.95＜D1/D3＜1.5(4)
Herein, D1 represents the semiaperture of first camera lens 100 at thing OBJ side place, and D3 represents the semiaperture of the three-lens 300 at plane of delineation IMG side place.
According to imaging lens system, be different from the general lens system comprising three camera lenses, the semiaperture of the second camera lens 200 is minimum, and the semiaperture of the first camera lens 100 is maximum or be slightly less than the semiaperture of three-lens 300, and in general lens system, the semiaperture of the first camera lens is minimum.The ratio of condition (4) the definition semiaperture of the first camera lens 100 at thing OBJ side place and the semiaperture of the three-lens 300 at plane of delineation IMG side place, that is, how much little the semiaperture of the first camera lens 100 is more how many or greatly than the semiaperture of three-lens 300.
The each in the camera lens of configuration imaging lens system will be described as follows in detail.
First camera lens 100 has positive refractive power, and can be formed as the convex meniscus to thing side.First camera lens 100 can have at least one aspheric surface, or two apparent surfaces can be aspheric surface.First camera lens 100 can have maximum optical power in the camera lens of configuration imaging lens system, and can have maximum or be slightly less than the semiaperture of semiaperture of three-lens 300.
Second camera lens 200 has negative refractive power, and can have bi-concave shape.Second camera lens 200 can have at least one aspheric surface, or two apparent surfaces can be aspheric surface.Second camera lens can have minimum semiaperture in the camera lens of configuration imaging lens system.
Three-lens 300 has negative refractive power or positive refractive power, and can be formed as the convex meniscus shape to plane of delineation IMG side.Three-lens 300 can have at least one aspheric surface, or two apparent surfaces can be aspheric surface.
Second camera lens 200 and three-lens 300 can serve as corrective lens, and by adopting aspheric surface to correct various aberration.
Diaphragm ST can be arranged between the first camera lens 100 and the second camera lens 200.But the position of diaphragm ST is not limited thereto.
First camera lens 100, second camera lens 200 and three-lens 300 can be formed by plastic material; But, the present invention is not limited thereto, and the first camera lens 100, second camera lens 200 and three-lens 300 can be formed by glass material.If use plastic material, so manufacturing cost can be reduced to the situation being less than and using glass material.
Saturating infrared ray (IR) optical filter 400 can be arranged between three-lens 300 and plane of delineation IMG.The light of the nearly IR wave band of saturating IR optical filter 400 transmissive (such as, about 800 nanometers are to the wave band of about 950 nanometers).
Such as the imageing sensor (not shown) such as charge-coupled device (CCD) (CCD) or complementary metal oxide semiconductor (CMOS) (CMOS) can be arranged on plane of delineation IMG place.
Hereinafter, lens data according to an embodiment of the invention will be described in detail.In lens data, S presentation surface is numbered, and ST represents diaphragm, and R represents radius-of-curvature, and T represents thickness or distance, and Nd represents refractive index, and Vd represents Abbe number.In addition, Fno. represents f-number, and f represents the focal length of imaging lens system.R, T and f can millimeter be that unit represents, and to be marked at surface number be * presentation surface after 2-3 and 5-10 is aspheric surface.
Can as the aspheric surface given a definition in embodiments of the invention.
Herein, Z represent on optical axis with the summit of camera lens distance apart, Y represents that perpendicular to the distance on the direction of optical axis, K represents the constant of the cone, and A, B, C, D, E, F, G, H and J represent asphericity coefficient, and R is the radius-of-curvature at the summit place of camera lens.
< first embodiment >
Fig. 1 shows the optical arrangement according to the imaging lens system of the first embodiment of the present invention.The imaging lens system of the present embodiment comprises: the first camera lens 100, has positive refractive power; Second camera lens 200, has negative refractive power; And three-lens 300, there is negative refractive power.The lens data of the first embodiment is as described below.
[table 1]
Fno.＝2.8，f＝3.960
| S | R | T | Nd | Vd |
| OBJ | Infinitely great | |||
| 2* | 0.9953 | 0.6971 | 1.5238 | 55.7282 |
| 3* | 4.3884 | 0.1000 | ||
| ST | Infinitely great | 0.6053 | ||
| 5* | -2.6292 | 0.2500 | 1.5238 | 55.7282 |
| 6* | 3.5273 | 0.3233 | ||
| 7* | -2.5964 | 0.2500 | 1.5238 | 55.7282 |
| 8* | -5.2291 | 0.7000 | ||
| 9 | Infinitely great | 0.3000 | 1.5098 | 64.1664 |
| 10 | Infinitely great | 0.2243 | ||
| IMG | Infinitely great | 0.000 |
Asphericity coefficient is as described below.
[table 2]
| S | 2 | 3 | 5 | 6 | 7 | 8 |
| K | -0.5172 | 1.7691 | 0 | 27.1168 | -68.1045 | -53.8644 |
| A | 0.0483 | 0.0331 | -0.2962 | -0.0624 | -0.9133 | -0.3253 |
| B | 0.0311 | 8.33E-05 | 0.3188 | 0.4151 | 2.3141 | 0.5406 |
| C | 0.062 | 0.3567 | -1.9411 | 0.2819 | -4.5741 | -0.661 |
| D | -0.0194 | -0.4799 | - | -1.648 | 5.9859 | 0.4342 |
| E | 0.0143 | -1.3859 | - | 4.2046 | - | 0.1089 |
| F | 0.0901 | 0.5403 | - | - | - | - |
| G | 0.0034 | 8.4537 | - | - | - | - |
| H | -0.2013 | 10.6153 | - | - | - | - |
| J | 0.273 | -40.1114 | - | - | - | - |
Fig. 2 shows according to the longitudinal spherical aberration of the imaging lens system of the first embodiment of the present invention, astigmatism curvature of field line and distortion.
About wavelength be 872 nanometers, the light of 852 nanometers and 832 nanometers shows longitudinal spherical aberration, astigmatism curvature of field line and distortion.In astigmatism curvature of field line, T1, T2 and T3 represent the curvature about three wavelength on tangential surface, and S1, S2 and S3 represent the curvature about three wavelength on sagittal surface.
< second embodiment >
Fig. 3 shows the optical arrangement of imaging lens system according to a second embodiment of the present invention.The imaging lens system of the present embodiment comprises: the first camera lens 100, has positive refractive power; Second camera lens 200, has negative refractive power; And three-lens 300, there is negative refractive power.The lens data of the second embodiment is as described below.
[table 3]
Fno.＝2.80，f＝3.9218
| S | R | T | Nd | Vd |
| OBJ | Infinitely great | |||
| 2* | 1.1222 | 0.5783 | 1.5238 | 55.7282 |
| 3* | 5.9518 | 0.1000 | ||
| ST | Infinitely great | 0.7752 | ||
| 5* | -16.6151 | 0.3000 | 1.5238 | 55.7282 |
| 6* | 3.8934 | 0.4076 | ||
| 7* | -1.4848 | 0.3000 | 1.5238 | 55.7282 |
| 8* | -5.6772 | 0.3833 | ||
| 9 | Infinitely great | 0.3000 | 1.5098 | 64.1664 |
| 10 | Infinitely great | 0.3455 | ||
| IMG | Infinitely great | 0.000 |
Asphericity coefficient is as described below.
[table 4]
| S | 2 | 3 | 5 | 6 | 7 | 8 |
| K | -0.4776 | 34.0241 | 0 | 39.5785 | -30.8059 | 50.4284 |
| A | 0.0664 | 0.0621 | -0.0969 | -0.0968 | -1.112 | 0.0176 |
| B | -0.0588 | -0.191 | -0.7016 | 0.2877 | 2.4774 | 0.1039 |
| C | 0.0454 | 0.3434 | 3.6333 | -3.0536 | 4.9918 | -0.7262 |
| D | 0.117 | -0.0042 | -8.6453 | -0.9775 | -7.4794 | 0.6756 |
| E | 0.0795 | -0.5469 | -34.7736 | 3.0313 | 5.7582 | -0.2405 |
| F | -0.0911 | -0.3325 | 26.2057 | 25.0121 | -13.0947 | -1.2009 |
| G | -0.2844 | 1.8251 | 274.6955 | 29.7051 | -0.7429 | 1.3057 |
| H | -0.2062 | 4.0783 | 680.4705 | -54.1308 | -76.9685 | 6.3083 |
| J | 0.6225 | -10.4814 | -2837.6044 | -425.7552 | 0.1259 | -6.2813 |
Fig. 4 shows the longitudinal spherical aberration of imaging lens system according to a second embodiment of the present invention, astigmatism curvature of field line and distortion.
About wavelength be 872 nanometers, the light of 852 nanometers and 832 nanometers shows longitudinal spherical aberration, astigmatism curvature of field line and distortion.In astigmatism curvature of field line, T1, T2 and T3 represent the curvature about three wavelength on tangential surface, and S1, S2 and S3 represent the curvature of three wavelength on sagittal surface.
< the 3rd embodiment >
Fig. 5 shows the optical arrangement of imaging lens system according to the third embodiment of the invention.The imaging lens system of the present embodiment comprises: the first camera lens 100, has positive refractive power; Second camera lens 200, has negative refractive power; And three-lens 300, there is positive refractive power.The lens data of the 3rd embodiment is as described below.
[table 5]
Fno.＝2.71，f＝3.9983
| S | R | T | Nd | Vd |
| OBJ | Infinitely great | |||
| 2* | 1.0264 | 0.6918 | 1.5238 | 55.7282 |
| 3* | 5.0664 | 0.1000 | ||
| ST | Infinitely great | 0.7128 | ||
| 5* | -1.9478 | 0.2500 | 1.5238 | 55.7282 |
| 6* | 3.0245 | 0.6457 | ||
| 7* | -5.2802 | 0.3164 | 1.5238 | 55.7282 |
| 8* | -5.3384 | 0.3833 | ||
| 9 | Infinitely great | 0.3000 | 1.5098 | 64.1664 |
| 10 | Infinitely great | 0.1000 | ||
| IMG | Infinitely great | 0.000 |
Asphericity coefficient is as described below.
[table 6]
Fig. 6 shows the longitudinal spherical aberration of imaging lens system according to the third embodiment of the invention, astigmatism curvature of field line and distortion.
About wavelength be 872 nanometers, the light of 852 nanometers and 832 nanometers shows longitudinal spherical aberration, astigmatism curvature of field line and distortion.In astigmatism curvature of field line, T1, T2 and T3 represent the curvature of three wavelength on tangential surface, and S1, S2 and S3 represent the curvature about three wavelength on sagittal surface.
Following table shows the lens data relevant to the above-mentioned condition 1 to 4 in each embodiment, and shows that lens data meets above-mentioned condition 1 to 4.
[table 7]
| First embodiment | Second embodiment | 3rd embodiment | |
| θ | 28.04 | 28.4 | 28.4 |
| tanθ | 0.54 | 0.54 | 0.54 |
| Condition 1 | 0.54 | 0.54 | 0.54 |
| D1 | 0.8 | 0.79 | 0.81 |
| f | 3.96 | 3.92 | 4 |
| Condition 2 | 4.95 | 4.96 | 4.94 |
| TTL | 3.45 | 3.49 | 3.5 |
| f | 3.96 | 3.92 | 4 |
| Condition 3 | 0.87 | 0.89 | 0.88 |
| D1 | 0.8 | 0.79 | 0.81 |
| D3 | 0.7 | 0.77 | 0.84 |
| Condition 4 | 1.14 | 1.03 | 0.96 |
Imaging lens system configures by using three camera lenses has excellent optical performance and small-sized and light-duty optical system.
Because imaging lens system can adopt aspheric surface on the surface at least one of camera lens, so aberration can easily be corrected, and manufacturing cost can reduce owing to using plastic material.
According to embodiments of the invention, the configurable imaging lens system with excellent optical performance and small-sized and light-duty structure.Imaging lens system of the present invention can be used for having and is converted in the various imaging devices of the imageing sensor of electric signal by the optical imagery formed by imaging lens system.
And imaging lens system can be used for by using the light of nearly IR wave band to carry out sense movement, and in the various electronic installation that can be used for needing motion sensing performance and mancarried device.
Although specifically show with reference to one exemplary embodiment of the present invention and describe the present invention, but those skilled in the art will appreciate that, the various changes of form and details can be done when not departing from the spirit and scope of the present invention defined by following claims to the present invention.
Claims (16)
1. an imaging lens system, is characterized in that sequentially comprising from thing side to plane of delineation side:
First camera lens, has positive refractive power;
Second camera lens, has negative refractive power; And
Three-lens, have positive refractive power or negative refractive power, wherein view angle theta meets the following conditions,
0.7＜|tanθ|＜1.5。
2. imaging lens system according to claim 1, wherein said imaging lens system also meets the following conditions: 4.8 < f/D1 < 5.0
Wherein f represents the focal length of described imaging lens system, and D1 is the semiaperture of described first camera lens at described thing side place.
3. imaging lens system according to claim 1, wherein said imaging lens system also meets the following conditions: 0.7 < TTL/f < 1.2,
Wherein TTL represents the distance from the thing side surface of described first camera lens to the described plane of delineation, and f represents the focal length of described imaging lens system.
4. imaging lens system according to claim 2, wherein said imaging lens system also meets the following conditions: 0.7 < TTL/f < 1.2,
Wherein TTL represents the distance from the thing side surface of described first camera lens to the described plane of delineation, and f represents the focal length of described imaging lens system.
5. imaging lens system according to claim 1, wherein said imaging lens system also meets the following conditions: 1.95 < D1/D3 < 1.5,
Wherein D1 represents the semiaperture of described first camera lens at described thing side place, and D3 represents the semiaperture of the described three-lens at described plane of delineation side place.
6. imaging lens system according to claim 1, wherein said second camera lens has minimum semiaperture in described first camera lens, described second camera lens and described three-lens.
7. imaging lens system according to claim 1, wherein said first camera lens has the convex meniscus shape to described thing side.
8. imaging lens system according to claim 1, wherein said second camera lens has bi-concave shape.
9. imaging lens system according to claim 1, wherein said three-lens has the convex meniscus shape to described plane of delineation side.
10. imaging lens system according to claim 1, wherein said first camera lens has at least one aspheric surface.
11. imaging lens systems according to claim 1, wherein said second camera lens has at least one aspheric surface.
12. imaging lens systems according to claim 1, wherein said three-lens has at least one aspheric surface.
13. imaging lens systems according to claim 1, wherein said first camera lens, described second camera lens and described three-lens are formed by plastic material.
14. imaging lens systems according to claim 1, wherein diaphragm is arranged between described first camera lens and described second camera lens.
15. imaging lens systems according to claim 1, wherein thoroughly infrared filter is arranged on described the between three-lens and the plane of delineation.
16. 1 kinds of imaging devices, is characterized in that comprising:
Imaging lens system as claimed in claim 1; And
Imageing sensor, for being converted to electric signal by the optical imagery formed by described imaging lens system.
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| CN105242379B (en) | 2018-04-10 |
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