CN115808772A - Vehicle-mounted lens optical system suitable for 8MP chip - Google Patents
Vehicle-mounted lens optical system suitable for 8MP chip Download PDFInfo
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Abstract
The invention belongs to the technical field of vehicle-mounted imaging lenses, and discloses a vehicle-mounted lens optical system suitable for an 8MP chip, which comprises a lens body, a lens body and a lens cover, wherein the lens body is coaxially arranged from a front object side to a rear image side: the device comprises a front group lens, a diaphragm, a rear group lens, an optical filter and an imaging surface; the front group of lenses has negative focal power; the rear group lens has positive focal power; the diaphragm is positioned between the front group of lenses and the rear group of lenses, and the center of the light through hole of the diaphragm is positioned on the optical axis; the imaging surface is positioned at the rear side of the rear group lens, and the optical filter is positioned between the rear group lens and the imaging surface; the value ratio of the combined focal length Fa of the front group lens to the combined focal length Fb of the rear group lens meets the condition that-2 is more than or equal to Fa/Fb is more than or equal to-23; wherein Fa is the combined focal length value of the front group lens, and Fb is the combined focal length value of the rear group lens. The invention improves the image resolving capability of the whole group of lenses. Meanwhile, the length and the caliber of the lens are effectively controlled, and the large-target-surface high-definition imaging is realized by using the small-caliber lens.
Description
Technical Field
The invention belongs to the technical field of vehicle-mounted imaging lenses, and relates to a vehicle-mounted lens optical system suitable for an 8MP chip.
Background
In recent years, as the demand for safe driving of vehicles has increased, the use of vehicular lenses has been rapidly developed, and the use of vehicular lenses has been developed from the provision of monitoring of the environment inside and outside the vehicle cabin to an Advanced Driving Assistance System (ADAS). The existing vehicle-mounted lens has insufficient image definition and poor image contrast, and can not meet the requirements of people on safe driving. In the ADAS system, an image-based driving assistance system is a core technology, and therefore, developing a high-resolution and contrast vehicle-mounted lens is a key technology for the development of the ADAS system.
Although many in-vehicle lens development companies in China have patents and reports on in-vehicle lenses, the ADAS system is related to Ningbo Shun-Yu in-vehicle optical technology, inc. and Jiangxi Co-creation electronics, inc. The Jiangxi union creation electronics Limited patent 201810771948.5 discloses a vehicle-mounted lens, the field angle of the vehicle-mounted lens is larger than 160 degrees, the focal length F' =1.28mm, the F number =2.8, and the total optical length TTL =12.5 mm. In patent 200920122166.5, issued to Ningbo shun vehicle-mounted optics technologies, the disclosure is directed to a megapixel large-aperture vehicle-mounted front-view lens, wherein the field angle is 100 °, the focal length F' =6.3mm, the F number =1.62, and the total optical length TTL =24mm, compared with patent 201810771948.5, the spatial resolution is greatly improved while the design focal length is increased, the image surface illumination is improved by reducing the F number, but the field angle is only 100 °, the imaging range is seriously influenced, and the use environment is limited.
Disclosure of Invention
Object of the invention
The purpose of the invention is: aiming at the problems of insufficient image definition, poor image contrast and the like of the conventional vehicle-mounted lens, the vehicle-mounted lens optical system suitable for high-definition imaging of the 8MP chip is provided.
(II) technical scheme
In order to solve the above technical problem, the present invention provides an on-vehicle lens optical system suitable for an 8MP chip, comprising, coaxially arranged from a front object side to a rear image side: the device comprises a front group lens 1, a diaphragm 2, a rear group lens 3, an optical filter 4 and an imaging plane 5; the front group lens 1 has negative focal power; the rear group lens 3 has positive focal power; the diaphragm 2 is positioned between the front group lens 1 and the rear group lens 3, and the center of a light through hole of the diaphragm 2 is positioned on an optical axis; the imaging surface 5 is positioned at the rear side of the rear group lens 3, and the optical filter 4 is positioned between the rear group lens 3 and the imaging surface 5; the ratio of the value of the combined focal length Fa of the front group lens 1 to the value of the combined focal length Fb of the rear group lens 3 meets the condition that-2 is more than or equal to Fa/Fb is more than or equal to-23; where Fa is the combined focal length of the front group lens 1, and Fb is the combined focal length of the rear group lens 3.
The front group lens 1 includes, in order from an object side to an image side: the system comprises an objective lens I1-1, an objective lens II 1-2 and an objective lens III 1-3; the first objective lens 1-1 has negative focal power, and the front surface of the first objective lens is a convex surface; the second objective lens 1-2 has negative focal power, and the front surface of the second objective lens is a concave surface; the objective lenses three 1 to 3 have a positive power and are biconvex lenses.
The rear group lens 3 includes, in order from an object side to an image side: objective four 3-1, objective five 3-2, objective six 3-3 and objective seven 3-4; the fourth objective lens 3-1 has positive focal power and is a meniscus lens, and the rear surface of the fourth objective lens is a convex surface; an objective lens five 3-2 which has positive focal power and is a biconvex lens; the object lens six 3-3 has negative focal power and is a cemented lens formed by gluing an object lens six positive lens 3-3a and an object lens six negative lens 3-3 b; the six positive lenses 3-3a of the objective lens have positive focal power and are double convex lenses; the six negative lenses 3-3b of the objective lens have negative focal power and are biconcave lenses; and the object lens seven 3-4 has positive focal power and is a meniscus lens, and the front surface of the object lens seven is a convex surface.
(III) advantageous effects
The vehicle-mounted lens optical system suitable for the 8MP chip provided by the technical scheme has the following beneficial effects:
(1) High-definition imaging can be realized, and the method is suitable for 8MP chips. The system adopts a mode of combining a spherical lens and an aspherical lens, and the optical system has a small F number and a large aperture, provides special forms of chromatic aberration and distortion, ensures the image surface illumination in a horizontal 120-degree field of view, and improves the resolution capability of the whole group of lenses; meanwhile, the length and the caliber of the lens are effectively controlled, and the large-target-surface high-definition imaging is realized by using the small-caliber lens.
(2) In the design process, the performances of the expansion coefficient, the stability and the like of the material are considered, the athermal design concept is introduced, the athermal design of the optical machine is realized through the matching of the optical material and the structural material, the imaging quality of the system in the temperature difference range of-40-115 ℃ is ensured, and the requirements of different use environments can be met.
Drawings
Fig. 1 is a schematic diagram of the components and optical paths of a vehicle-mounted lens according to an embodiment of the invention.
Fig. 2 is a graph of modulation transfer function characteristics of an onboard lens in an embodiment of the invention.
Fig. 3 is a graph showing distortion characteristics of the on-vehicle lens according to an embodiment of the present invention.
FIG. 4 is a graph illustrating axial chromatic aberration of a vehicle-mounted lens according to an embodiment of the present invention.
FIG. 5 is a graph of vertical axis chromatic aberration of a vehicle lens in an embodiment of the present invention.
Fig. 6 is a graph of relative illumination of a vehicle lens in an embodiment of the invention.
Wherein: the device comprises a front group lens 1, a first objective lens 1-1, a second objective lens 1-2, a third objective lens 1-3, a diaphragm 2, a rear group lens 3, a fourth objective lens 3-1, a fifth objective lens 3-2, a sixth objective lens 3-3, a seventh objective lens 3-4, an optical filter 4 and an imaging plane 5; the optical lens comprises a first objective front surface S1, a first objective rear surface S2, a second objective front surface S3, a second objective rear surface S4, a third objective front surface S5, a third objective rear surface S6, a fourth objective front surface S7, a fourth objective rear surface S8, a fifth objective front surface S9, a fifth objective rear surface S10, a sixth objective front surface S11, a sixth objective gluing surface S12, a sixth objective rear surface S13, a seventh objective front surface S14, a seventh objective rear surface S15, a filter front surface S16 and a filter rear surface S17.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
As shown in fig. 1, the on-vehicle lens optical system of the present embodiment includes a front group lens 1, a diaphragm 2, a rear group lens 3, a filter 4, and an imaging surface 5. The front group lens 1 has negative focal power; the rear group lens 3 has positive focal power; the diaphragm 2 is positioned between the front group lens 1 and the rear group lens 3, and the center of a light through hole of the diaphragm 2 is positioned on an optical axis; the imaging surface 5 is located on the side of the rear group lens 3 away from the diaphragm 2 and the front group lens 1, and the optical filter 4 is located between the rear group lens 3 and the imaging surface 5.
For convenience of description, in the front group lens 1 and the rear group lens 3, the front surface and the rear surface of each lens are respectively expressed by a first objective lens front surface S1, a first objective lens rear surface S2, a second objective lens front surface S3, a second objective lens rear surface S4, a third objective lens front surface S5, a third objective lens rear surface S6, a fourth objective lens front surface S7, a fourth objective lens rear surface S8, a fifth objective lens front surface S9, a fifth objective lens rear surface S10, a sixth objective lens front surface S11, a sixth objective lens cemented surface S12, a sixth objective lens rear surface S13, a seventh objective lens front surface S14, a seventh objective lens rear surface S15, a filter front surface S16, and a filter rear surface S17.
The ratio of the combined focal length Fa of the front group lens to the combined focal length Fb of the rear group lens meets the condition that-2 is more than or equal to Fa/Fb is more than or equal to-23; wherein Fa is the combined focal length value of the front group lens, and Fb is the combined focal length value of the rear group lens. Based on the focal length ratio, the vehicle-mounted lens has the characteristics of small F number, clear image and more than or equal to 120 degrees of horizontal view field.
In the above vehicular lens assembly, the front group lens 1 includes, in order from the object side to the image side: the system comprises an objective lens I1-1, an objective lens II 1-2 and an objective lens III 1-3; the objective lens I1-1 has negative focal power, and the front surface S1 of the objective lens I is a convex surface; the second objective lens 1-2 has negative focal power, and the front surface S3 of the second objective lens is a concave surface; the objective lens three 1-3, having a positive power, is a biconvex lens. After entering the front group of lenses 1, the imaging light beams sequentially pass through the first objective lens 1-1, the second objective lens 1-2 and the third objective lens 1-3.
In this embodiment, the constituent elements of the front group lens 1 of the on-vehicle lens should also satisfy the following conditions:
the objective lens I1-1 further satisfies: n1 is more than or equal to 1.7, and V1 is less than or equal to 50; wherein N1 is the refractive index of the first objective lens 1-1, and V1 is the Abbe number of the first objective lens 1-1;
the objective lens II 1-2 further satisfies the following conditions: n2 is more than or equal to 1.7, and V2 is less than or equal to 50; wherein N2 is the refractive index of the second objective lens 1-2, and V2 is the Abbe number of the second objective lens 1-2;
the three objective lenses 1-3 also satisfy the following conditions: n3 is more than or equal to 1.7, and V3 is less than or equal to 50; wherein N3 is the refractive index of objective lens III 1-3, and V3 is the Abbe number of objective lens III 1-3.
In the above vehicle-mounted lens, the rear group lens 3 includes, in order from the object side to the image side: objective four 3-1, objective five 3-2, objective six 3-3 and objective seven 3-4; the fourth objective lens 3-1 has positive focal power and is a meniscus lens, and the rear surface S8 of the fourth objective lens is a convex surface; an objective lens five 3-2 which has positive focal power and is a biconvex lens; the object lens six 3-3 has negative focal power and is a cemented lens which consists of an object lens six positive lens 3-3a and an object lens six negative lens 3-3 b; the six positive lenses 3-3a of the objective lens have positive focal power and are double convex lenses; the six negative lenses 3-3b of the objective lens have negative focal power and are biconcave lenses; the seven objective lenses 3-4 have positive focal power, and the seven front surfaces S14 of the seven meniscus lens are convex. The imaging light beam enters the rear group of lenses 3 and sequentially passes through an objective lens IV 3-1, an objective lens V3-2, an objective lens VI 3-3 and an objective lens VII 3-4.
In this embodiment, the constituent elements of the rear group lens 3 of the onboard lens should also satisfy the following conditions:
the objective four 3-1 also satisfies: n4 is less than or equal to 1.6, and V4 is more than or equal to 70; wherein N4 is the refractive index of the objective lens IV 3-1, and V4 is the Abbe number of the objective lens IV 3-1;
the objective five 3-2 also satisfies: n5 is more than or equal to 1.7, and V5 is less than or equal to 50; wherein N5 is the refractive index of the five objective lenses 3-2, and V5 is the Abbe number of the five objective lenses 3-2;
the six positive lenses 3-3a of the objective lens further satisfy the following conditions: n is more than or equal to 1.7, V is less than or equal to 50; wherein N positive is the refractive index of the six positive lenses 3-3a of the objective lens, and V positive is the Abbe number of the six positive lenses 3-3a of the objective lens; the six negative lenses 3-3b of the objective lens further satisfy: n minus is more than or equal to 1.7, V minus is less than or equal to 50; wherein N positive is the refractive index of the six negative lenses 3-3b of the objective lens, and V positive is the Abbe number of the six negative lenses 3-3b of the objective lens;
the seven objective lenses 3-4 also satisfy: n7 is more than or equal to 1.7, and V7 is less than or equal to 50; wherein N7 is the refractive index of the objective lens seven 3-4, and V7 is the Abbe number of the objective lens seven 3-4.
In the embodiment, the components of the front group lens 1 of the vehicle-mounted lens are designed coaxially; the components of the rear group lens 3 adopt a coaxial design; meanwhile, the front group lens 1, the diaphragm 2 and the rear group lens 3 are also designed coaxially.
In this embodiment, the vehicle-mounted lens further needs to satisfy the following conditions: TTL is more than or equal to 35mm and more than or equal to 20mm; wherein, the TTL represents a vertical distance from the front group lens 1 to the image plane 5 of the on-vehicle lens, that is, an optical total length of the on-vehicle lens.
In this embodiment, the second objective lens 1-2 and the seventh objective lens 3-4 of the onboard lens are aspheric lenses, and any aspheric surface satisfies the following formula:
wherein, Z is the height loss of the aspheric surface at the position of the clear aperture radius y along the optical axis direction, namely the aperture radius is the axial distance from the y position to the aspheric surface peak; r is the curvature radius of the central spherical surface; k is a quadric coefficient; A. b, C and D are high-order aspheric coefficients respectively.
In the vehicle-mounted lens in the embodiment, the first objective lens 1-1 is made of crown materials with good chemical properties and strong corrosion resistance, so that the adaptability of the vehicle-mounted lens to severe environments such as sand prevention, salt fog prevention and the like can be improved, the second objective lens 1-2 and the seventh objective lens 3-4 are made of low-softening mold pressing materials, the third objective lens 1-3, the fourth objective lens 3-1, the fifth objective lens 3-2 and the sixth objective lens 3-3 are made of glass materials, and the full glass design can reduce image plane drift and improve the temperature adaptability of the vehicle-mounted lens.
The optical filter 4 in this embodiment is located between the rear group lens 3 and the imaging surface 5. The optical filter 4 is used for controlling the transmission spectrum width of optical radiation, cutting off non-imaging spectrum and improving the contrast of an image plane. The imaging broad spectrum enters the optical filter 4 after passing through the front group objective lens 1, the diaphragm 2 and the rear group objective lens 3, and the imaging spectrum coming out of the optical filter 4 is converged on the image surface 5.
In one embodiment of the present invention, the radii of curvature r, the center thickness d, the refractive index N, and the abbe number V of the respective sides of the objective lenses one 1 to 1, the objective lenses two 1 to 2, the objective lenses three 1 to 3, the diaphragm 2, the objective lenses four 3 to 1, the objective lenses five 3 to 2, the objective lenses six 3 to 3, and the objective lenses seven 3 to 4 satisfy the following table:
the front surface S3 and the back surface S4 of the second objective lens 1-2, the front surface S14 and the back surface S15 of the seventh objective lens 3-4 are aspheric surfaces, the quadric surface coefficient K of the aspheric surface coefficients is shown in the following table:
in the present embodiment, the in-vehicle lens satisfying the above conditions has a focal length value f' =3.6, an f number =1.6, and a total optical length TTL =30mm from the front group lens to the image plane.
Optical performance simulation is performed on the on-vehicle lens in the present embodiment, and a modulation transfer function characteristic curve of the on-vehicle lens is shown in fig. 2, a distortion characteristic curve is shown in fig. 3, a vertical axis chromatic aberration curve is shown in fig. 4, an axial chromatic aberration curve is shown in fig. 5, and a relative illuminance curve is shown in fig. 6.
Fig. 2 is an optical transfer function curve of the on-vehicle lens in this embodiment, where the abscissa is spatial frequency, the unit is lp/mm, and the ordinate is modulation degrees of an image point and an object point. Curve F1: limit is the diffraction limit, also the limiting resolution, of the on-board lens; the transfer function curve corresponding to the on-axis light at the viewing angle of 0 ° is F1, the transfer function curves corresponding to the off-axis fields F2, F3, F4, F5, and F6 are transfer function curves corresponding to the off-axis fields, the viewing angle corresponding to F2 is 30 °, the viewing angle corresponding to F3 is 36 °, the viewing angle corresponding to F4 is 50 °, the viewing angle corresponding to F5 is 50 °, and the viewing angle corresponding to F6 is 61.7 °. It can be seen from fig. 2 that at a spatial frequency of 85lp/mm, the diffraction limit of the optical transfer function in this embodiment is close to 0.9, the optical transfer function of the on-axis field is > 0.8, the optical transfer function of the maximum field is > 0.73, and the optical transfer functions of the full field are all between 0.73 and 0.8, close to the diffraction limit.
Fig. 3 is an optical distortion curve of the vehicle-mounted lens in this embodiment, and the optical distortion value of the maximum field of view is-0.44, which meets the requirement of the large field of view for distortion.
Fig. 4 is an axial chromatic aberration curve of the on-vehicle lens in this embodiment, where the abscissa is axial spherical aberration in mm, the ordinate is aperture, and 1 represents normalized maximum aperture. In fig. 4, a curve c represents the chromatic spherical aberration of light with a wavelength of 470nm in the vehicle-mounted lens, a curve d represents the chromatic spherical aberration of light with a wavelength of 550nm in the vehicle-mounted lens, a curve e represents the chromatic spherical aberration of light with a wavelength of 670nm in the vehicle-mounted lens, and the chromatic spherical aberrations of the three spectrums are well controlled in a full aperture range. The axial chromatic aberration is the difference value of the chromatic spherical aberration, and finally the axial chromatic aberration is less than 0.013mm.
Fig. 5 is a vertical axis chromatic aberration curve of the on-vehicle lens in the present embodiment, where the abscissa represents vertical axis chromatic spherical aberration in mm, the ordinate represents aperture, and 1 represents normalized maximum aperture. In fig. 5, the curve a is the homeotropic chromatic aberration of the wavelength 470nm and the wavelength 670nm, the curve b is the homeotropic chromatic aberration of the wavelength 470nm and the wavelength 550nm, and the distance between the curve a and the curve b at the same aperture is the homeotropic chromatic aberration of the wavelength 550nm and the wavelength 67 nm. It can be seen from curve 4 that the final axial chromatic aberration is less than 0.006mm.
Fig. 6 is a relative illuminance curve of the on-vehicle lens in the present embodiment, where the abscissa represents the angle of view and the ordinate represents the relative illuminance. The relative illumination is used for evaluating the brightness uniformity of the image plane and is the ratio of the field of view outside the field of view to the field of view on the axis of view. The on-vehicle lens in this embodiment has a relative illuminance of 73% at the maximum field of view of 61.7 °.
Compared with the technology in 201810771948.5, the focal length is increased, but the F number is reduced, so that the resolution and the relative illumination are greatly improved; in addition, compared with the technology in 200920122166.5, although the F number is equivalent, the field angle is increased, and the imaging range and the use environment are expanded. The scheme of the embodiment provides the vehicle-mounted lens which is clear in image, good in image contrast and suitable for 8MP chip high-definition imaging.
According to the technical scheme, the vehicle-mounted lens optical system has large-aperture imaging performance by adopting a mode of combining a spherical surface with a non-spherical surface, provides special chromatic aberration and distortion for the lens, ensures the image surface illumination in a horizontal 120-degree field of view, effectively controls the length and the caliber of the lens while improving the resolution capability of the whole group of lenses, and realizes large-target-surface imaging by using the small-caliber lens; in the design process, the performances of the expansion coefficient, the stability and the like of the material are considered, the athermalization design idea is introduced, the athermalization design of the optical machine is realized through the matching of the optical material and the structural material, the imaging quality of the system in the temperature difference range of minus 40 ℃ to 115 ℃ is ensured, the problems of image surface deviation and image quality reduction are effectively reduced, and the requirements of different use environments can be met.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be considered as the protection scope of the present invention.
Claims (10)
1. An optical system of a vehicular lens suitable for an 8MP chip is characterized by comprising, coaxially arranged from a front object side to a rear image side: the device comprises a front group lens (1), a diaphragm (2), a rear group lens (3), an optical filter (4) and an imaging surface (5); the front group of lenses (1) has negative focal power; the rear group lens (3) has positive focal power; the diaphragm (2) is positioned between the front group lens (1) and the rear group lens (3), and the center of a light through hole of the diaphragm (2) is positioned on an optical axis; the imaging surface (5) is positioned at the rear side of the rear group lens (3), and the optical filter (4) is positioned between the rear group lens (3) and the imaging surface (5); the value ratio of the combined focal length Fa of the front group lens (1) to the combined focal length Fb of the rear group lens (3) meets the condition that-2 is more than or equal to Fa/Fb is more than or equal to-23; wherein Fa is the combined focal length value of the front group lens (1), and Fb is the combined focal length value of the rear group lens (3).
2. The on-vehicle lens optical system suitable for an 8MP chip as claimed in claim 1, wherein the front group lens (1) comprises, in order from an object side to an image side: a first objective lens (1-1), a second objective lens (1-2) and a third objective lens (1-3); the first objective lens (1-1) has negative focal power, and the front surface of the first objective lens is a convex surface; a second objective lens (1-2) which has negative focal power and the front surface of which is a concave surface; objective lens three (1-3), having positive power, is a biconvex lens.
3. The vehicle-mounted lens optical system suitable for the 8MP chip as claimed in claim 2, wherein the first objective lens (1-1) further satisfies: n1 is more than or equal to 1.7, and V1 is less than or equal to 50; wherein N1 is the refractive index of the first objective lens (1-1), and V1 is the Abbe number of the first objective lens (1-1); the second objective lens (1-2) further satisfies: n2 is more than or equal to 1.7, and V2 is less than or equal to 50; wherein N2 is the refractive index of the second objective lens (1-2), and V2 is the Abbe number of the second objective lens (1-2); the objective lens three (1-3) further satisfies: n3 is more than or equal to 1.7, and V3 is less than or equal to 50; wherein N3 is the refractive index of the objective lens III (1-3), and V3 is the Abbe number of the objective lens III (1-3).
4. The on-vehicle lens optical system suitable for an 8MP chip as claimed in claim 3, wherein the rear group lens (3) comprises, in order from an object side to an image side: objective four (3-1), objective five (3-2), objective six (3-3) and objective seven (3-4); an objective lens IV (3-1) which has positive focal power and is a meniscus lens, and the back surface of the objective lens IV is a convex surface; an objective lens five (3-2) which has a positive focal power and is a biconvex lens; the object lens six (3-3) has negative focal power and is a cemented lens formed by cementing an object lens six positive lens (3-3 a) and an object lens six negative lens (3-3 b); an objective lens six positive lens (3-3 a) having a positive focal power and being a biconvex lens; an objective lens six negative lens (3-3 b) which has negative focal power and is a biconcave lens; and the object lens seven (3-4) has positive focal power and is a meniscus lens, and the front surface of the object lens seven is a convex surface.
5. The vehicle-mounted lens optical system suitable for the 8MP chip as recited in claim 4, wherein the objective lens four (3-1) further satisfies: n4 is less than or equal to 1.6, and V4 is more than or equal to 70; wherein N4 is the refractive index of objective lens four (3-1), and V4 is the Abbe number of objective lens four (3-1); the objective lens five (3-2) further satisfies: n5 is more than or equal to 1.7, and V5 is less than or equal to 50; wherein N5 is the refractive index of the objective lens five (3-2), and V5 is the Abbe number of the objective lens five (3-2); the objective lens hexa-positive lens (3-3 a) further satisfies: n is more than or equal to 1.7, V is less than or equal to 50; wherein N positive is the refractive index of the six positive lenses (3-3 a) of the objective lens, and V positive is the Abbe number of the six positive lenses (3-3 a) of the objective lens; the six negative lenses (3-3 b) of the objective lens further satisfy: n minus is more than or equal to 1.7, V minus is less than or equal to 50; wherein N is the refractive index of the six negative lenses (3-3 b) of the objective lens, and V is the Abbe number of the six negative lenses (3-3 b) of the objective lens; the objective lens seven (3-4) further satisfies: n7 is more than or equal to 1.7, and V7 is less than or equal to 50; wherein N7 is the refractive index of the seven (3-4) objective lens, and V7 is the Abbe number of the seven (3-4) objective lens.
6. The vehicle-mounted lens optical system applicable to the 8MP chip as recited in claim 5, wherein the vehicle-mounted lens optical system satisfies: TTL is more than or equal to 35mm and more than or equal to 20mm; wherein TTL represents the vertical distance from the front group lens (1) to the image surface (5), namely the total optical length of the vehicle-mounted lens.
7. The optical system of claim 6, wherein the second objective lens (1-2) and the seventh objective lens (3-4) are aspheric lenses, and any aspheric surface satisfies the following formula:
wherein, Z is the height loss of the aspheric surface at the position of the clear aperture radius y along the optical axis direction, namely the aperture radius is the axial distance from the y position to the aspheric surface peak; r is the curvature radius of the central spherical surface; k is a quadric coefficient; A. b, C and D are high-order aspheric coefficients respectively.
8. The optical system of claim 7, wherein the first objective (1-1) is made of crown material, the second objective (1-2) and the seventh objective (3-4) are made of low-softening molding material, and the third objective (1-3), the fourth objective (3-1), the fifth objective (3-2) and the sixth objective (3-3) are made of glass material.
9. The on-board lens optical system for an 8MP chip according to claim 8, wherein the radius of curvature r, the center thickness d, the refractive index N and the abbe number V of each side of the first objective lens (1-1), the second objective lens (1-2), the third objective lens (1-3), the stop (2), the fourth objective lens (3-1), the fifth objective lens (3-2), the sixth objective lens (3-3) and the seventh objective lens (3-4) satisfy the following table:
in the front group lens 1 and the rear group lens 3, the front surface and the rear surface of each lens are respectively expressed by a first objective front surface S1, a first objective rear surface S2, a second objective front surface S3, a second objective rear surface S4, a third objective front surface S5, a third objective rear surface S6, a fourth objective front surface S7, a fourth objective rear surface S8, a fifth objective front surface S9, a fifth objective rear surface S10, a sixth objective front surface S11, a sixth objective gluing surface S12, a sixth objective rear surface S13, a seventh objective front surface S14 and a seventh objective rear surface S15;
10. the on-vehicle lens optical system for an 8MP chip according to claim 9, wherein the front surface S3 and the rear surface S4 of the second objective lens (1-2) and the front surface S14 and the rear surface S15 of the seventh objective lens (3-4) are aspheric, and have a conic coefficient K, and the high-order aspheric coefficients a, B, C, D are shown in the following table:
。
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