CN201344994Y - Wide-angle image pick-up lens and image pick-up device - Google Patents
Wide-angle image pick-up lens and image pick-up device Download PDFInfo
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- CN201344994Y CN201344994Y CNU200820175604XU CN200820175604U CN201344994Y CN 201344994 Y CN201344994 Y CN 201344994Y CN U200820175604X U CNU200820175604X U CN U200820175604XU CN 200820175604 U CN200820175604 U CN 200820175604U CN 201344994 Y CN201344994 Y CN 201344994Y
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Abstract
The utility model provides a wide-angle image pick-up lens and an image pick-up device. The wide-angle image pick-up lens not only achieves miniaturization and low cost but also improves the telecentric property and keeps high optical performance. The wide-angle image pick-up lens (1), from the lateral side of an object, comprises the following parts in sequence: a first negative lens (L1) which has a convex surface facing towards the object side and takes a meniscus shape, a second negative lens (L2) which has a concave surface facing towards the image side and has at least one non-spherical surface, a third positive lens (L3) which has a convex surface facing towards the object side and has at least one non-spherical surface, and a fourth lens (L4) which has a convex surface facing towards the image side and has at least one non-spherical surface. The synthetic focal length of the first lens (L1) and the second lens (L2) is named as f12, and the synthetic focal length of the third lens (L3) and the fourth lens (L4) is named as f34, the distance between the lens diaphragm and the fourth lens (L4) on the optical axis of the lateral side of the object is named as d7, and the focal length of the whole system is named as f, and the parameters conform to the following conditional expressions (1) and (2): (1) f12/f34 is more than minus 0.4 but less than minus 0.2 and (2) d7/f is more than 0.30 but less than 0.65.
Description
Technical field
The utility model relates to a kind of wide-angle imaging lens and camera head, in particular to the wide-angle imaging lens that is applicable to the vehicle mounted camera that uses CCD (Charge Coupled Device) or CMOS imaging apparatuss such as (Complementary Metal OxideSemiconductor), used for mobile terminal camera, monitoring camera etc. and possess the camera head of this imaging lens system.
Background technology
In recent years, the miniaturization of imaging apparatus such as CCD or CMOS and high pixelation were developed.Meanwhile, the miniaturization that possesses the picture pick-up device body of these imaging apparatuss is also developed, and the imaging lens system that it loaded is also required miniaturization, lightweight.
And, guarantee the good visual field for employed imaging lens systems such as vehicle mounted camera, used for mobile terminal camera, monitoring cameras in wide scope, just require not only wide-angle but also have high imaging performance in imaging region integral body.
Further, as for the imaging lens system in above-mentioned field,, require the few optical system of lens number from expectation cost degradation aspect.In the past, the wide-angle imaging lens as 4 formations in above-mentioned field had following patent documentation 1～3 described lens.
[patent documentation 1] patent disclosure 2002-244031 communique
[patent documentation 2] patent disclosure 2005-227426 communique
[patent documentation 3] patent disclosure 2006-259704 communique
Yet, at patent documentation 1,2 wide-angle imaging lens of being put down in writing, because from leaning on most the distance of the lens face of object side, the therefore not talkative requirement of satisfying miniaturization to image planes.At the wide-angle imaging lens that patent documentation 3 is put down in writing, though sought the miniaturization of optical axis direction, the chief ray of the outer light of axle that the image planes periphery is assembled is big to the angle of the incident of image planes,, becomes the low optical system of telecentric iris that is.If be suitable for the low optical system of telecentric iris at the device that uses imaging apparatus, the phenomenon of image periphery deepening then takes place, so-called shade.
The utility model content
The utility model is in view of the above problems, and its purpose is, provides a kind of small-sized and low-cost and telecentric iris than more being improved, and can keeping the wide-angle imaging lens of high optical property in the past, and possesses the camera head of this wide-angle imaging lens.
Wide-angle imaging lens of the present utility model, it is characterized in that, possess successively from object side: with convex surface towards object side and be the 1st negative lens of meniscus shape, is aspheric the 2nd negative lens with concave surface towards picture side and at least 1, is aspheric the 3rd positive lens with convex surface towards object side and at least 1, diaphragm, with be aspheric the 4th lens with convex surface towards picture side and at least 1, the synthetic focal length of above-mentioned the 1st lens and above-mentioned the 2nd lens is made as f12, the synthetic focal length of above-mentioned the 3rd lens and above-mentioned the 4th lens is made as f34, distance on the optical axis of the object side of above-mentioned diaphragm and above-mentioned the 4th lens is made as d7, when the focal length of total system is made as f, the formula that meets the following conditions (1), (2):
-0.4＜f12/f34＜-0.2…(1)
0.30＜d7/f＜0.65…(2)。
Need to prove, above-mentioned " with convex surface towards object side and be meniscus shape ", " with concave surface towards the picture side ", " with convex surface towards object side ", " with convex surface towards the picture side ", be near the optical axis.
Wide-angle imaging lens of the present utility model, following formation; It is 4 promptly by the lens number is suppressed at least, seek low cost, and by suitably selecting the formation of each lens, the the 2nd, the 3rd, the 4th lens are made as aspheric surface, the formula that satisfies condition (1), (2), thus, all aberrations of revisal well not only, and seek miniaturization and realize than better telecentric iris in the past.
Further, in wide-angle imaging lens of the present utility model, the focal length of above-mentioned the 2nd lens is made as f2, when the focal length of above-mentioned the 3rd lens is made as f3, the formula that preferably meets the following conditions (3), (4), (5), (6).Need to prove that any 1 that satisfies in following conditional (3)～(6) as preferred mode gets final product, and can be to satisfy combination in any.
-1.4＜f2/f＜-0.5…(3)
1.0＜f3/f＜1.8…(4)
-0.9＜f12/f＜-0.5…(5)
0.3＜f/f34＜0.5…(6)
Camera head of the present utility model is characterized in that, possesses: the wide-angle imaging lens of the present utility model of above-mentioned record and the formed optical image of this wide-angle imaging lens is converted to the imaging apparatus of electric signal.
According to the utility model, can provide a kind of is 4 less lens number by constituting minimum, suitably set each lens shape and refracting power, the formula that satisfies condition (1), (2), not only seek miniaturization and cost degradation, and telecentric iris compared with the past is improved, and can guarantee the wide-angle imaging lens of optical property, and the camera head that possesses this wide-angle imaging lens.
Description of drawings
Fig. 1 is the sectional view of the related wide-angle imaging lens of an expression by way of example of the present utility model.
Fig. 2 is the sectional view that the lens of the related wide-angle imaging lens of expression embodiment of the present utility model 1 constitute.
Fig. 3 is the sectional view that the lens of the related wide-angle imaging lens of expression embodiment of the present utility model 2 constitute.
Fig. 4 is the sectional view that the lens of the related wide-angle imaging lens of expression embodiment of the present utility model 3 constitute.
Fig. 5 is the sectional view that the lens of the related wide-angle imaging lens of expression embodiment of the present utility model 4 constitute.
Fig. 6 is the sectional view that the lens of the related wide-angle imaging lens of expression embodiment of the present utility model 5 constitute.
Fig. 7 is the sectional view that the lens of the related wide-angle imaging lens of expression embodiment of the present utility model 6 constitute.
Fig. 8 is the sectional view that the lens of the related wide-angle imaging lens of expression embodiment of the present utility model 7 constitute.
Fig. 9 is the sectional view that the lens of the related wide-angle imaging lens of expression embodiment of the present utility model 8 constitute.
Figure 10 is each aberration diagram of the related wide-angle imaging lens of embodiment of the present utility model 1.
Figure 11 is each aberration diagram of the related wide-angle imaging lens of embodiment of the present utility model 2.
Figure 12 is each aberration diagram of the related wide-angle imaging lens of embodiment of the present utility model 3.
Figure 13 is each aberration diagram of the related wide-angle imaging lens of embodiment of the present utility model 4.
Figure 14 is each aberration diagram of the related wide-angle imaging lens of embodiment of the present utility model 5.
Figure 15 is each aberration diagram of the related wide-angle imaging lens of embodiment of the present utility model 6.
Figure 16 is each aberration diagram of the related wide-angle imaging lens of embodiment of the present utility model 7.
Figure 17 is each aberration diagram of the related wide-angle imaging lens of embodiment of the present utility model 8.
Figure 18 is the figure of the configuration of the vehicle mounted camera head that is used to illustrate that embodiment of the present utility model is related.
Among the figure: 1-wide-angle imaging lens, 2-off-axis ray, 5-imaging apparatus, the 100-automobile, 101, the outer camera of 102-car, camera in the 103-car, face interval on the optical axis of i face of di-and i+1 face, L1-the 1st lens, L2-the 2nd lens, L3-the 3rd lens, L4-the 4th lens, Pim-image space, the PP-optics, the radius-of-curvature of i face of ri-, Sim-image planes, the St-aperture diaphragm, the Z-optical axis.
Embodiment
Below, describe embodiment of the present utility model in detail with reference to accompanying drawing.
The lens profile figure that represents the wide-angle imaging lens 1 that an embodiment of the present utility model is related at Fig. 1.In Fig. 1, also represent to have the chief ray of maximum image height as off-axis ray 2.Need to prove that configuration example shown in Figure 1 constitutes corresponding to the lens of following embodiment 1.And, represent to have the lens profile figure of another configuration example of the related wide-angle imaging lens of embodiment of the present utility model at Fig. 3～Fig. 9, these lens corresponding to following embodiment 2～8 constitute.The basic lens of the wide-angle imaging lens of embodiment 1～8 constitute identical, so, as the related wide-angle imaging lens of embodiment of the present utility model, be that example describes following with the wide-angle imaging lens 1 of configuration example shown in Figure 1.
Wide-angle imaging lens 1 possesses successively from object side: the object side be convex form and for the 1st negative lens L1 of meniscus shape, be concave shape and at least 1 for aspheric negative the 2nd lens L2, object side is convex form and at least 1 for aspheric positive the 3rd lens L3, aperture diaphragm St, as the side as the side be that convex form and at least 1 are aspheric the 4th lens L4.
And, at Fig. 1, consider that wide-angle imaging lens 1 is applicable to the situation of camera head, also figure is shown with the imaging apparatus 5 of the image planes Sim that is configured in the image space Pim that comprises wide-angle imaging lens 1.Imaging apparatus 5 will be converted to electric signal by the optical image that wide-angle imaging lens forms, and for example be formed by ccd image sensor etc.
In wide-angle imaging lens 1, lean on the 1st lens L1 of object side to be made as the negative meniscus lens of convex surface most by being configured in towards object side, just help wide-angleization.
And, for example, when in the environment of strictnesses such as vehicle mounted camera, using wide-angle imaging lens 1, imagination is configured in leans on the 1st lens L1 of object side to be exposed to wind and rain or carwash solvent most, but the 1st lens L1 is made as the meniscus shape of convex surface towards object side, then be difficult for residual garbage, dust, water droplet etc. under these situations, such advantage exists.Further, compare when being made as the concave-concave shape, because of bending of light slow, so can reduce the aberration generating capacity, and favourable at aspects such as revisal distortion aberrations.
Need to prove that in example shown in Figure 1, the 1st lens L1 is made of spherical lens, but the 1st lens L1 of the present utility model also can be any of spherical lens, non-spherical lens.But, as following, be configured in by the material of the 1st lens of object side and preferably use glass rather than resin, therefore, if the 1st lens L1 is made as spherical lens, comparing when being made as non-spherical lens just more can be with low-cost production.
With regard to the 2nd lens L2, the 3rd lens L3, the 4th lens L4, because adopted the high non-spherical lens of design freedom, thus favourable aspect the revisal aberration, just obtain good resolution easily with less lens number and short total length.
The 2nd lens L2, the 3rd lens L3, the 4th lens L4 respectively also can be for being aspheric surface simultaneously only separately, and perhaps the two sides all can be aspheric surface.If the two sides is made as aspheric surface, then design freedom increases, and is just more favourable aspect the revisal aberration.
In the wide-angle imaging lens of present embodiment, the synthetic focal length of the 1st lens L1 and the 2nd lens L2 is made as f12, the synthetic focal length of the 3rd lens L3 and the 4th lens L4 is made as f34, distance on the optical axis of the object side of aperture diaphragm St and the 4th lens L4 is made as d7, when the focal length of total system is made as f, the formula that preferably meets the following conditions (1), (2):
-0.4＜f12/f34＜-0.2…(1)
0.30＜d7/f＜0.65…(2)。
Conditional (1) is the ratio about the synthetic focal power of 2 lens of the synthetic focal power of 2 lens of object side and picture side.If surpass the upper limit of conditional (1), then be difficult to revisal curvature of the image well.If be lower than the lower limit of conditional (1), then the 1st lens L1 and the 2nd lens L2 must be configured in the mode of separating with the 3rd lens L3, thereby the lens total length is elongated in the visual angle in order needing to obtain, and optical system maximizes.
Conditional (2) is about the distance of aperture diaphragm St and the 4th lens L4 ratio to the total system focal length.If surpass the upper limit of conditional (2), then the distance of aperture diaphragm St and the 4th lens L4 is elongated, and the lens total length is elongated, and optical system maximizes.If be lower than the lower limit of conditional (2), then can shorten the lens total length, the effective diameter of the 4th lens also diminishes, but the chief ray of the outer light of axle is to incident angle (angle that chief ray is become with the optical axis) increase of image planes, telecentric iris deterioration.If the telecentric iris deterioration then just causes the minimizing of peripheral light amount at the camera head that uses photo detectors such as CCD or CMOS, and produces shade.
Further, the wide-angle imaging lens that embodiment of the present utility model is related preferably satisfies following conditional (2-1), at this moment, can further seek the miniaturization of optical system and the raising of telecentric iris.
0.38＜d7/f＜0.60…(2-1)
And, at the wide-angle imaging lens of present embodiment, when the focal length with the 2nd lens L2 is made as f2, the formula that preferably satisfies condition (3):
-1.4＜f2/f＜-0.5…(3)。
Conditional (3) is about the ratio of the 2nd lens L2 focal power to the total system focal power.If surpass the upper limit of conditional (3), the negative power grow of the 2nd lens L2 is then compared the thickness thickening of periphery with near the thickness the optical axis, and at the periphery as the side of the 2nd lens L2, the tangential line of face diminishes with the angle that optical axis is become, so manufacturing worsens, and cost improves.If be lower than the lower limit of conditional (3), then the negative power deficiency of the 2nd lens L2 is difficult to obtain with great visual angle.
And, in the wide-angle imaging lens of present embodiment, when the focal length with the 3rd lens L3 is made as f3, the formula that preferably meets the following conditions (4):
1.0＜f3/f＜1.8…(4)。
Conditional (4) is about the ratio of the 3rd lens L3 focal power to the total system focal power.In this wide-angle imaging lens, the 3rd lens L3 that constitutes by positive lens eliminates by the 1st lens L1 of negative lens and the multiplying power chromatic aberation of the 2nd lens L2 generation.If surpass the upper limit of conditional (4), then the effect of the elimination multiplying power chromatic aberation of these the 3rd lens L3 dies down, and it is big that the multiplying power chromatic aberation becomes.If be lower than the lower limit of conditional (4), then the positive light coke grow of the 3rd lens L3 is difficult to revisal curvature of the image well.
And, in the wide-angle imaging lens of present embodiment, the formula that preferably meets the following conditions (5):
-0.9＜f12/f＜-0.5…(5)。
Conditional (5) is about the ratio of the synthetic focal power of 2 negative lenses of object side to the total system focal power.If surpass the upper limit of conditional (5), then the 3rd lens L3 of the strong positive light coke that coincide with the negative power of the 1st lens L1, the 2nd lens L2 just becomes necessaryly, and is difficult to revisal curvature of the image well.If be lower than the lower limit of conditional (5), then the visual angle in order needing to obtain must be configured the 1st lens L1 or the 2nd lens L2 in the mode of separating with the 3rd lens L3, thereby the lens total length is elongated and optical system maximizes.
And, in the wide-angle imaging lens of present embodiment, the formula that preferably meets the following conditions (6):
0.3＜f/f34＜0.5…(6)。
Conditional (6) is the ratio about total system focal power and the synthetic focal power of 2 lens of picture side.If surpass the upper limit of conditional (6), then under the state that keeps aberrations such as intelligent image difference well, be difficult to obtain the back focal length of needs.If be lower than the lower limit of conditional (6), then be difficult to revisal curvature of the image well.
And, in the wide-angle imaging lens of present embodiment, in order to ensure than better telecentric iris in the past, as shown in Figure 1, maximum image height is made as Y, to be made as L to the distance on the optical axis of image planes from lens face by object side, with the chief ray of maximum image height to the incident angle (angle that this chief ray is become with optical axis) of image planes when being made as θ, the formula that preferably meets the following conditions (7), (8):
Y/L＜0.25…(7)
θ≤23°…(8)。
Need to prove, in the wide-angle lens of the present utility model,, preferably satisfy following conditional (7-1) for the miniaturization of the optical axis direction of system.And, in order when guaranteeing good telecentric iris, to realize the miniaturization of system, according to described conditional (7) and following conditional (7-1), the formula that preferably satisfies condition (7-2).
Y/L＞0.21…(7-1)
0.21＜Y/L＜0.25…(7-2)
And, in this wide-angle imaging lens, shown in the embodiment described as follows, preferably the Abbe number with the material of the 1st lens L1 is made as more than 40, the Abbe number of the material of the 2nd lens L2 and the 4th lens L4 is made as more than 50, the Abbe number of the material of the 3rd lens L3 is made as below 40.At this moment, the chromatic aberation of revisal multiplying power well can obtain good resolution.
Need to prove, for example, when in the environment of strictnesses such as vehicle mounted camera, using this wide-angle imaging lens, be configured in the 1st lens L1 by object side preferably use the anti-anti-surperficial cracking that causes by wind and rain or sand, by the temperature variation of direct sunlight, the further material of chemicalss such as anti-anti-grease, washing agent is promptly used water tolerance, against weather, acid resistance, material that resistance to chemical reagents is high.And, as being configured in the material of depending on the 1st lens L1 of object side most, preferably use firm, difficult broken material.According to the above fact, as for the material of the 1st lens L1, particularly, preferably use glass, perhaps also can use transparent pottery.Pottery is higher with glassy phase specific strength commonly used, and has the high character of thermotolerance.
As the material of the 2nd lens L2, the 3rd lens L3, the 4th lens L4, preferably use plastics, at this moment, but when precision is made aspherical shape well, can seek lightweight and cost degradation.
According to plastic material, if water absorptivity Gao Ze refractive index and geomery variation along with the discrepancy of moisture, so, there is the possibility that bad influence takes place on the optical property.Therefore, use polyolefins plastics (water-intake rate 0.01%) at the 2nd lens L2 and the 4th lens L4, use polycarbonate-based plastics (water-intake rate 0.2%) and the extremely little material of water absorptivity at the 3rd lens, then the caused performance cracking of suction can be suppressed be irreducible minimum.
In this wide-angle imaging lens,, also can on each lens, form and prevent reflectance coating in order to reduce ghost image light.At this moment, in the illustrated wide-angle imaging lens 1 of Fig. 1,, should notice that the tangential line of each face of periphery is little with the angle that optical axis is become in the picture side of the 1st lens L1, the picture side of the 2nd lens L2, the object side of the 3rd lens L3.According to this formation, the thickness that prevents reflectance coating that has periphery is than the attenuation of lens central portion, and the worry of generation reflectivity distribution.Therefore, be made as the reflectance coating that prevents below the above 900nm of 600nm, can all reduce reflectivity fifty-fifty at effective diameter, and can reduce ghost image light by form the wavelength that will become minimum at the face more than 1 among above-mentioned 3 faces near the reflectivity the central authorities.
Need to prove that if near the reflectivity central authorities is minimum wavelength ratio 600nm weak point, then the reflectivity at periphery becomes too short for minimum wavelength, the reflectivity of long wavelength side uprises, and therefore, pink ghost image takes place easily.And, long if near the reflectivity central authorities be minimum wavelength ratio 900nm, be that the wavelength of minimum becomes long then, and the reflectivity of short wavelength side uprises at the reflectivity of central portion, so, as the reddish while of color, bluish ghost image takes place easily.
And, in this wide-angle imaging lens, becoming parasitic light by the outer light beam of the effective diameter between each lens and arrive image planes and become ghost image, such worry exists, and therefore, the shading means of this parasitic light being carried out shading is set preferably as required.As these shading means, for example, the part outside the effective diameter of saturating image side applies opaque coating, or opaque sheet material is set also can.Perhaps, also can opaque sheet material be set on the light path of the light beam that becomes parasitic light as the shading means.
[embodiment]
The concrete numerical value embodiment of the wide-angle imaging lens that the utility model is related then, is described.
At first, embodiment 1 is described as an example.The lens data of the wide-angle imaging lens that embodiment 1 is related is shown in table 1, and aspherical surface data is shown in table 2.
[table 1]
| Si | ri | di | Nej | vdj |
| 1 | 12.8171 | 1.2000 | 1.77621 | 49.6 |
| 2 | 3.8000 | 1.3682 | ||
| 3* | 46.7159 | 0.9000 | 1.53340 | 55.5 |
| 4* | 0.6756 | 0.6429 | ||
| 5* | 1.1108 | 2.1200 | 1.58820 | 30.3 |
| 6* | -9.9109 | 0.1500 | ||
| 7 | ∞ (aperture diaphragm) | 0.5842 | ||
| 8* | 2.7481 | 2.0001 | 1.53340 | 55.5 |
| 9* | -1.9568 |
[table 2]
In the lens data of table 1, Si represents being the 1st and along with towards the i that increases successively as side (i=1 by the face of the inscape of object side, 2,3 ...) the face number, ri represents the radius-of-curvature of i face, di represent on the optical axis Z of i face and i+1 face face at interval, Nej represents being the 1st and along with towards the j that increases successively as side (j=1 by the optical parameter of object side, 2,3,) refractive index to e line (wavelength 546.07nm) of optical parameter, vdj represents the Abbe number to d line (wavelength 587.6nm) of j optical parameter.In table 1, radius-of-curvature and face unit at interval is mm, and radius-of-curvature is made as the situation of convex surface towards object side just, and is made as negative towards the situation as side convex surface.Need to prove, comprise also that at the lens data of table 1 expression has aperture diaphragm St, is recited as (aperture diaphragm) on the radius-of-curvature hurdle of aperture diaphragm St.
And in the lens data of table 1, aspheric surface with the * seal, is represented to have the numerical value of paraxial radius-of-curvature at the face number as aspheric radius-of-curvature.The aspherical surface data of table 2 is represented about these aspheric asphericity coefficients.Asphericity coefficient is in each COEFFICIENT K of the aspheric surface formula of representing with following formula (A), the value of Bm (m=3,4,5).
Zd＝C·h
2/{1+(1-K·C
2·h
2)
1/2}+∑Bm·h
m……(A)
In the formula,
Zd: the aspheric degree of depth (falling in the length of perpendicular on the vertical plane of the optical axis that contacts with the aspheric surface summit under the point on the aspheric surface of height h)
H: highly (distance from the optical axis to the lens face)
C: the inverse number of paraxial radius-of-curvature
K, Bm: asphericity coefficient (m=3,4,5)
The lens pie graph of the wide-angle imaging lens that embodiment 1 is related is shown in Fig. 2.Need to prove that the aperture diaphragm St of Fig. 2 is not expression shape or size, and represents its position on optical axis Z.
In Fig. 2, comprise that also expression has the parallel flat shape optics PP that is configured between wide-angle imaging lens and the image planes Sim.When camera head is suitable for wide-angle imaging lens, according to the formation of the phase pusher side of loading lens, preferred disposition cloche, low-pass filter or infrared intercepting filter etc.For example, wide-angle imaging lens is used in in-vehicle camera, when subsidy is used with the scotopia camera as night vision, also can insert between lens combination and imaging apparatus by the optical filter of ultraviolet light to blue light.Optics PP is the parts of the imagination of these cloches or optical filter etc., and at this, using refractive index as an example is 1.51, and thickness is the parts of 1.05mm.
And, in example shown in Figure 2, between wide-angle imaging lens and image planes Sim, dispose by the various optical filters of low-pass filter or specific wave band etc., but substitute this, also can between each lens, dispose these various optical filters.Perhaps, also can have the coating of the effect identical in the lens face formation of any lens with various optical filters.
More than, to the implication of the mark of described each table of embodiment 1 to following embodiment too, the optics of use, the graphic technique of aperture diaphragm are also identical.Represent the lens pie graph of the wide-angle imaging lens that embodiment 2～8 is related respectively at Fig. 3～Fig. 9, represent lens data, aspherical surface data respectively at table 3～table 16.Need to prove, in each embodiment, the ri of lens data table, di (i=1,2,3 ...) corresponding to symbol ri, the di of lens pie graph.
[table 3]
| Si | ri | di | Nej | vdj |
| 1 | 13.6091 | 1.0000 | 1.77621 | 49.6 |
| 2 | 3.8000 | 1.4693 | ||
| 3* | 43.8970 | 1.0000 | 1.53340 | 55.5 |
| 4* | 0.6926 | 0.6429 | ||
| 5* | 1.0763 | 2.1200 | 1.58820 | 30.3 |
| 6* | -8.3727 | 0.1500 | ||
| 7 | ∞ (aperture diaphragm) | 0.5549 | ||
| 8* | 2.6326 | 2.0001 | 1.53340 | 55.5 |
| 9* | -2.0698 |
[table 4]
[table 5]
| Si | ri | di | Nej | vdj |
| 1 | 13.2131 | 1.0000 | 1.77621 | 49.6 |
| 2 | 3.8000 | 2.2435 | ||
| 3* | 42.5015 | 1.0000 | 1.53340 | 55.5 |
| 4* | 0.7152 | 0.6429 | ||
| 5* | 1.0898 | 2.1200 | 1.58820 | 30.3 |
| 6* | -15.3286 | 0.1500 | ||
| 7 | ∞ (aperture diaphragm) | 0.6250 | ||
| 8* | 2.7110 | 2.0001 | 1.53340 | 55.5 |
| 9* | -2.0905 |
[table 6]
[table 7]
Embodiment 4 lens datas
| Si | ri | di | Nej | vdj |
| 1 | 21.2145 | 1.0000 | 1.77621 | 49.6 |
| 2 | 3.8000 | 0.9131 | ||
| 3* | 10.5341 | 1.0000 | 1.53340 | 55.5 |
| 4* | 0.6190 | 0.6429 | ||
| 5* | 1.0285 | 2.1200 | 1.58820 | 30.3 |
| 6* | -15.0248 | 0.1499 | ||
| 7 | ∞ (aperture diaphragm) | 0.5388 | ||
| 8* | 2.4806 | 2.0027 | 1.53340 | 55.5 |
| 9* | -2.0054 |
[table 8]
Embodiment 4 aspherical surface datas
[table 9]
| Si | ri | di | Nej | vdj |
| 1 | 18.8173 | 1.0000 | 1.77621 | 49.6 |
| 2 | 4.1786 | 0.8588 | ||
| 3* | 25.5508 | 1.0000 | 1.53340 | 55.5 |
| 4* | 0.6565 | 0.6429 | ||
| 5* | 1.1038 | 2.1200 | 1.58820 | 30.3 |
| 6* | -10.1780 | 0.1462 | ||
| 7 | ∞ (aperture diaphragm) | 0.6344 | ||
| 8* | 2.3676 | 2.0013 | 1.53340 | 55.5 |
| 9* | -1.9999 |
[table 10]
[table 11]
Embodiment 6 lens datas
| Si | ri | di | Nej | vdj |
| 1 | 16.6505 | 1.0000 | 1.77621 | 49.6 |
| 2 | 4.1786 | 0.8578 | ||
| 3* | 17.2004 | 1.0000 | 1.53340 | 55.5 |
| 4* | 0.6431 | 0.6429 | ||
| 5* | 1.1520 | 2.1429 | 1.58820 | 30.3 |
| 6* | -7.3870 | 0.1500 | ||
| 7 | ∞ (aperture diaphragm) | 0.6260 | ||
| 8* | 2.3702 | 2.0000 | 1.53340 | 55.5 |
| 9* | -2.0208 |
[table 12]
Embodiment 6 aspherical surface datas
[table 13]
Embodiment 7 lens datas
| Si | ri | di | Nej | vdj |
| 1 | 12.3000 | 1.0000 | 1.77621 | 49.6 |
| 2 | 4.1790 | 1.5341 | ||
| 3* | -26.6404 | 1.0000 | 1.53340 | 55.5 |
| 4* | 0.6507 | 0.6429 | ||
| 5* | 1.0609 | 2.1429 | 1.58820 | 30.3 |
| 6* | -9.1385 | 0.3214 | ||
| 7 | ∞ (aperture diaphragm) | 0.4998 | ||
| 8* | 2.5375 | 2.0000 | 1.53340 | 55.5 |
| 9* | -2.1177 |
[table 14]
Embodiment 7 aspherical surface datas
[table 15]
Embodiment 8 lens datas
| Si | ri | di | Nej | vdj |
| 1 | 14.0000 | 1.0000 | 1.77621 | 49.6 |
| 2 | 4.1786 | 1.5843 | ||
| 3* | -10.2907 | 1.0000 | 1.53340 | 55.5 |
| 4* | 0.8165 | 0.6429 | ||
| 5* | 1.1591 | 2.1429 | 1.58820 | 30.3 |
| 6* | -9.4820 | 0.3214 | ||
| 7 | ∞ (aperture diaphragm) | 0.6085 | ||
| 8* | 2.3381 | 2.0440 | 1.53340 | 55.5 |
| 9* | -2.5575 |
[table 16]
Embodiment 8 aspherical surface datas
In the foregoing description 1～8, the 1st lens L1 is a material with optical glass, and the two sides is made as spherical shape, so, obtain good against weather and be difficult to by cuts such as sands, and, the cheap manufacturing can be compared.For the 2nd lens L2, the 3rd lens L3, the 4th lens L4, because of as the high non-spherical lens of optical aberration correcting ability, its material is made as plastics, so, when can realize aspherical shape accurately, but light weight and low-cost the manufacturing.
In table 17 expression corresponding to the various data of the wide-angle imaging lens of the foregoing description 1～8 and the value of above-mentioned conditional (1)～(8).
[table 17]
| |
|
|
Embodiment 4 | |
Embodiment 6 | Embodiment 7 | Embodiment 8 | |
| f | 1.227 | 1.210 | 1.193 | 1.221 | 1.212 | 1.198 | 1.203 | 1.286 |
| Bf | 1.727 | 1.515 | 1.701 | 1.642 | 1.604 | 1.607 | 1.615 | 1.569 |
| L | 10.692 | 10.452 | 11.483 | 10.010 | 10.008 | 10.026 | 10.757 | 10.912 |
| Fno. | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 |
| 2ω | 158.8° | 158.8° | 158.8° | 158.4° | 158.0° | 158.0° | 156.2° | 155.4° |
| f12/f34 | -0.286 | -0.297 | -0.273 | -0.275 | -0.280 | -0.291 | -0.259 | -0.307 |
| d7/f | 0.476 | 0.459 | 0.524 | 0.441 | 0.523 | 0.523 | 0.415 | 0.473 |
| f2/f | -1.054 | -1.099 | -1.152 | -1.046 | -1.057 | -1.068 | -0.977 | -1.069 |
| f3/f | 1.490 | 1.461 | 1.522 | 1.409 | 1.501 | 1.560 | 1.457 | 1.476 |
| f12/f | -0.753 | -0.755 | -0.738 | -0.719 | -0.770 | -0.789 | -0.723 | -0.758 |
| f/f34 | 0.380 | 0.394 | 0.370 | 0.382 | 0.364 | 0.369 | 0.358 | 0.405 |
| Y/L | 0.231 | 0.237 | 0.216 | 0.247 | 0.247 | 0.247 | 0.230 | 0.227 |
| 0 | 20.5° | 20.8° | 20.2° | 19.7° | 19.4° | 19.3° | 20.5° | 18.4° |
In table 17, f is the focal length of total system, and Bf is the rear cut-off distance that air converts, L for from by the distance (rear cut-off distance amount by air converted) of object side lens face to the optical axis of image planes, FNo. is a F value, 2 ω are the full visual angle of maximum.The unit of f, Bf, L is mm, the unit degree of being of 2 ω, θ.
And in table 17, f12, f34, d7, f2, f3, Y, θ are each value of conditional (1)～(8).Corresponding to the numerical value of conditional (1)～(8) of table 17 is to be the value of reference wavelength with e line (546.07nm).Shown in table 17, the wide-angle imaging lens of embodiment 1～8 all satisfies above-mentioned conditional (1)～(8).
As known from Table 17, the wide-angle imaging lens of embodiment 1～8 is configured with wide-angle and small-sized mode, and telecentric iris is also higher than the imaging lens system of open source literature 3.
The aberration diagram of representing the spherical aberration of the wide-angle imaging lens that the foregoing description 1～8 is related, astigmatic aberration, distortion aberration (distortion aberration), multiplying power chromatic aberation, intelligent image difference at Figure 10～Figure 17 respectively.And, each aberration when Figure 10～Figure 17 represents to have between the 4th lens L4 and image planes Sim the above-mentioned optics PP of configuration.Represent with the e line to be the aberration of reference wavelength at each aberration diagram, but in spherical aberration diagram and multiplying power chromatic aberation figure, also represent aberration, enclose the symbol of e, C, g respectively for C line (wavelength 656.3nm), g line (wavelength 436nm).The FNo. of spherical aberration diagram is the F value, and the ω of other aberration diagrams is a half angle of view.
Need to prove,, use focal distance f, half angle of view ω (the parameter processing of total system the distortion aberration diagram, the full visual angle of 0≤ω≤maximum) desirable image height is made as f * tan ω, and therefore expression, just becomes negative higher value at periphery apart from its side-play amount.But the distortion aberration of the wide-angle imaging lens of embodiment 1～8 as if being that benchmark calculates with the image height according to stereoprojection or equidistant projection, then becomes positive higher value.This be because the wide-angle imaging lens of embodiment 1～8 be according to compare with the lens that design with image height control distortion aberration according to stereoprojection or equidistant projection, the image mapped of the periphery lens after getting big mode and being considered.From as Figure 10～17 as can be known, each aberration of the foregoing description 1～8 is able to revisal well, and has the good optical performance.
That is, the wide-angle imaging lens of embodiment 1～8 is made of 4 less lens number, and realizes the improvement of miniaturization and telecentric iris, and can cheaply make, and also has high optical property.The wide-angle imaging lens of embodiment 1～8 that possesses these advantages is applicable to vehicle mounted camera of images such as the place ahead that is used to take automobile, side, rear etc.
As making use-case, be illustrated in the state that loads the camera head of the wide-angle imaging lens that possesses present embodiment on the automobile 100 at Figure 18.In Figure 18, automobile 100 possess the dead range that is useful on the side of taking its codriver's seat side the outer camera 101 of car, be used to take automobile 100 rear side dead range the outer camera 102 of car be installed in the rearview mirror back side and be used to take camera 103 in the car of the field range identical with driver's seat.The outer camera 101 of car, the outer camera 102 of car and Che Nei camera 103 are the related camera heads of present embodiment, and possess and have: according to the wide-angle imaging lens of embodiment of the present utility model with the formed optical image of wide-angle imaging lens is converted to the imaging apparatus 5 of electric signal.
The wide-angle imaging lens that embodiment of the present utility model is related, because of having above-mentioned advantage, so, also can the outer camera 101,102 of small-sized and cheap formation car and car in camera 103, but and at the good picture of the shooting face imaging of its imaging apparatus 5.
More than, exemplify embodiment and embodiment has illustrated the utility model, but the utility model is not limited to above-mentioned embodiment and embodiment, can carry out all distortion.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index is not limited in the value shown in above-mentioned each numerical value embodiment, desirable other values.
And, in the embodiment of camera head, illustrate the example that the utility model is applicable to the vehicle mounted camera, but the utility model is not limited thereto purposes, for example, also applicable to used for mobile terminal camera or monitoring camera etc.
Claims (6)
1. a wide-angle imaging lens is characterized in that,
Have successively from object side:
The 1st negative lens, its with convex surface towards object side and be meniscus shape;
The 2nd negative lens, it is aspheric surface with concave surface towards picture side and at least 1;
The 3rd positive lens, it is aspheric surface with convex surface towards object side and at least 1;
Diaphragm; With
The 4th lens, it is aspheric surface with convex surface towards picture side and at least 1,
The synthetic focal length of above-mentioned the 1st lens and above-mentioned the 2nd lens is made as f12, the synthetic focal length of above-mentioned the 3rd lens and above-mentioned the 4th lens is made as f34, distance on the optical axis of the object side of above-mentioned diaphragm and above-mentioned the 4th lens is made as d7, when the focal length of total system is made as f, the formula that meets the following conditions (1), (2):
-0.4＜f12/f34＜-0.2…(1)
0.30＜d7/f＜0.65…(2)。
2. wide-angle imaging lens according to claim 1 is characterized in that,
When the focal length of above-mentioned the 2nd lens is made as f2, the formula that meets the following conditions (3):
-1.4＜f2/f＜-0.5…(3)。
3. wide-angle imaging lens according to claim 1 and 2 is characterized in that,
When the focal length of above-mentioned the 3rd lens is made as f3, the formula that meets the following conditions (4):
1.0＜f3/f＜1.8…(4)。
4. according to each described wide-angle imaging lens in the claim 1～3, it is characterized in that the formula that also meets the following conditions (5):
-0.9＜f12/f＜-0.5…(5)。
5. according to each described wide-angle imaging lens in the claim 1～4, it is characterized in that the formula that also meets the following conditions (6):
0.3＜f/f34＜0.5…(6)。
6. camera head is characterized in that possessing:
Each described wide-angle imaging lens in the claim 1～5; With
The formed optical image of this wide-angle imaging lens is converted to the imaging apparatus of electric signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008114805 | 2008-04-25 | ||
| JP2008114805 | 2008-04-25 |
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| CN201344994Y true CN201344994Y (en) | 2009-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820175604XU Expired - Lifetime CN201344994Y (en) | 2008-04-25 | 2008-10-21 | Wide-angle image pick-up lens and image pick-up device |
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| Country | Link |
|---|---|
| JP (1) | JP5113001B2 (en) |
| CN (1) | CN201344994Y (en) |
| TW (1) | TWM356915U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087402A (en) * | 2009-12-08 | 2011-06-08 | 三星电机株式会社 | Optical system for camera |
| WO2022156123A1 (en) * | 2021-01-20 | 2022-07-28 | 湖北华鑫光电有限公司 | 4p lens with large angle of view and large relative illumination |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5270425B2 (en) | 2009-03-31 | 2013-08-21 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| JP5893997B2 (en) * | 2012-04-24 | 2016-03-23 | 京セラ株式会社 | Imaging lens and imaging apparatus |
| WO2014123137A1 (en) * | 2013-02-08 | 2014-08-14 | コニカミノルタ株式会社 | Imaging optical system, imaging optical device, and digital instrument |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4700821B2 (en) * | 2001-02-21 | 2011-06-15 | マクセルファインテック株式会社 | Wide angle lens |
| JP2007206516A (en) * | 2006-02-03 | 2007-08-16 | Enplas Corp | Imaging lens |
| JP5084335B2 (en) * | 2007-04-16 | 2012-11-28 | 京セラ株式会社 | Imaging lens |
| JP2009265338A (en) * | 2008-04-24 | 2009-11-12 | Kyocera Corp | Wide-angle imaging lens |
-
2008
- 2008-09-19 JP JP2008240415A patent/JP5113001B2/en not_active Expired - Fee Related
- 2008-10-16 TW TW97218493U patent/TWM356915U/en not_active IP Right Cessation
- 2008-10-21 CN CNU200820175604XU patent/CN201344994Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087402A (en) * | 2009-12-08 | 2011-06-08 | 三星电机株式会社 | Optical system for camera |
| WO2022156123A1 (en) * | 2021-01-20 | 2022-07-28 | 湖北华鑫光电有限公司 | 4p lens with large angle of view and large relative illumination |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009282484A (en) | 2009-12-03 |
| JP5113001B2 (en) | 2013-01-09 |
| TWM356915U (en) | 2009-05-11 |
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