CN115808772A - Vehicle-mounted lens optical system suitable for 8MP chip - Google Patents

Abstract

The invention belongs to the technical field of vehicle-mounted imaging lenses, and discloses a vehicle-mounted lens optical system suitable for 8MP chips, including coaxially arranged from the front object side to the rear image side: a front group lens, a diaphragm, a rear group lens, a light filter film and imaging surface; the front group lens has negative refractive power; the rear group lens has positive refractive power; the diaphragm is located between the front group lens and the rear group lens, and the center of the aperture through the diaphragm is located 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 ratio of the combined focal length Fa of the front group lens and the value of the combined focal length Fb of the rear group lens satisfies -2≥Fa/Fb ≥‑23; Among them, Fa is the combined focal length value of the front lens group, and Fb is the combined focal length value of the rear lens group. The invention improves the resolution capability of the whole group of lenses. At the same time, the length and aperture of the lens have also been effectively controlled, and the use of a small aperture lens has achieved high-definition imaging of a large target surface.

Description

A vehicle-mounted lens optical system suitable for 8MP chips

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 8MP chips.

Background technique

In recent years, as people's demand for safe driving of vehicles has increased, vehicle-mounted cameras have developed rapidly. The use of vehicle-mounted cameras has evolved from providing environmental monitoring inside and outside the car to advanced driver assistance systems (ADAS). The existing vehicle-mounted lens has insufficient image clarity and poor image contrast, which cannot meet people's needs for safe driving. In the ADAS system, the image-based assisted driving system is its core technology, so the development of high-resolution and contrast vehicle-mounted lenses has become a key technology for the development of the ADAS system.

Many domestic vehicle lens development companies have patents and reports on vehicle lenses, but Ningbo Sunny Vehicle Optical Technology Co., Ltd. and Jiangxi Lianchuang Electronics Co., Ltd. are related to ADAS systems. Jiangxi Lianchuang Electronics Co., Ltd. patent 201810771948.5 discloses a vehicle-mounted lens with a field of view greater than 160°, focal length f'=1.28mm, F number=2.8, and total optical length TTL=12.5mm. This design has a large field of view, The characteristics of short focal length and large F number will inevitably lead to the disadvantages of low spatial resolution and low illumination of the image plane, which cannot provide images with high resolution and contrast. In the patent 200920122166.5 of Ningbo Sunny Vehicle Optics Technology Co., Ltd., a large-aperture vehicle-mounted front-view lens with megapixels is disclosed. 24mm, compared with the patent 201810771948.5, its design focal length has been increased and the spatial resolution has been greatly improved, and the reduction of the F number has also improved the image surface illumination, but its field of view is only 100°, which seriously affects the imaging Scope, which limits its use environment.

Contents of the invention

(1) Purpose of the invention

The purpose of the present invention is to provide a vehicle lens optical system suitable for high-definition imaging of an 8MP chip for the problems of insufficient image definition and poor image contrast of the existing vehicle lens.

(2) Technical solution

In order to solve the above technical problems, the present invention provides a vehicle-mounted lens optical system suitable for 8MP chips, which includes coaxial arrangements from the front object side to the rear image side: a front group lens 1, a diaphragm 2, a rear group lens 3, Optical filter 4 and imaging surface 5; Described front group lens 1 has negative refractive power; Back group lens 3 has positive refractive power; Diaphragm 2 is positioned between front group lens 1 and rear group lens 3, light The center of the aperture 2 is located on the optical axis; the imaging surface 5 is located at the rear side of the rear group lens 3, and the optical filter 4 is located between the rear group lens 3 and the imaging surface 5; the combined focal length Fa of the front group lens 1 and the rear group lens The value ratio of the combined focal length Fb of the lens 3 satisfies -2≥Fa/Fb≥-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.

Wherein, the front group lens 1 comprises in turn from the object side to the image side: objective lens one 1-1, objective lens two 1-2 and objective lens three 1-3; objective lens one 1-1 has negative refractive power, and the objective lens The front surface of the first lens is convex; the second objective lens 1-2 has negative refractive power, and the front surface of the second objective lens is concave; the third objective lens 1-3 has positive optical power and is a biconvex lens.

Wherein, described back group lens 3 comprises successively from object side to image side: objective lens four 3-1, objective lens five 3-2, objective lens six 3-3 and objective lens seven 3-4; Objective lens four 3-1, have positive The focal power is a meniscus lens, and the rear surface of the objective lens four is convex; the objective lens five 3-2 has positive refractive power and is a biconvex lens; the objective lens six 3-3 has negative refractive power and is a cemented The mirror is made up of six positive lenses 3-3a of the objective lens and six negative lenses 3-3b of the objective lens; the six positive lenses 3-3a of the objective lens have positive refractive power and are a biconvex lens; the six negative lenses 3-3b of the objective lens have The negative refractive power is a biconcave lens; the objective lens 3-4 has positive refractive power and is a meniscus lens, and the front surface of the objective lens 7 is convex.

(3) Beneficial effects

The vehicle-mounted lens optical system suitable for 8MP chips provided by the above technical solution has the following beneficial effects:

(1) It can realize high-definition imaging and is suitable for 8MP chips. The system adopts the combination of spherical lens and aspheric lens. While the optical system has a small F number and large aperture, it provides a special form of chromatic aberration and distortion, which ensures the image plane illumination in the horizontal 120° field of view and improves the image quality. The resolution capability of the entire group of lenses; at the same time, the length and aperture of the lens have also been effectively controlled, and the use of a small aperture lens has achieved high-definition imaging of a large target surface.

(2) In the design process, the expansion coefficient and stability of the material were considered, and the idea of athermalization design was introduced. Through the matching of optical materials and structural materials, the optical-mechanical athermalization design was realized, ensuring the system in- The imaging quality within the temperature range of 40℃～115℃ can meet the needs of different use environments.

Description of drawings

FIG. 1 is a schematic diagram of the composition and optical path of a vehicle-mounted lens in an embodiment of the present invention.

Fig. 2 is a characteristic curve diagram of the modulation transfer function of the vehicle-mounted lens in a specific embodiment of the present invention.

Fig. 3 is a graph showing distortion characteristics of a vehicle-mounted lens in a specific embodiment of the present invention.

Fig. 4 is a graph of axial chromatic aberration of a vehicle-mounted lens in a specific embodiment of the present invention.

Fig. 5 is a vertical axis chromatic aberration graph of a vehicle lens in a specific embodiment of the present invention.

Fig. 6 is a graph of the relative illuminance of the vehicle lens in a specific embodiment of the present invention.

Among them: front group lens 1, objective lens one 1-1, objective lens two 1-2, objective lens three 1-3, diaphragm 2, rear group lens 3, objective lens four 3-1, objective lens five 3-2, objective lens six 3- 3, objective lens seven 3-4, optical filter 4, imaging surface 5; objective lens one front surface S1, objective lens one rear surface S2, objective lens two front surface S3, objective lens two rear surface S4, objective lens three front surface S5, objective lens three rear Surface S6, objective lens 4 front surface S7, objective lens 4 rear surface S8, objective lens 5 front surface S9, objective lens 5 rear surface S10, objective lens 6 front surface S11, objective lens 6 glued surface S12, objective lens 6 rear surface S13, objective lens 7 front surface S14 , The rear surface S15 of the objective lens seven, the front surface S16 of the optical filter, and the rear surface S17 of the optical filter.

Detailed ways

In order to make the purpose, content and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in FIG. 1 , the vehicle-mounted lens optical system of this 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 refractive power; the rear group lens 3 has positive refractive power; the diaphragm 2 is located between the front group lens 1 and the rear group lens 3, and the center of the aperture of the diaphragm 2 is located on the optical axis Above; 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 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 with object lens one front surface S1, object lens one rear surface S2, object lens two front surfaces S3, object lens two rear surfaces S4, object lens Three front surfaces S5, objective lens three rear surfaces S6, objective lens four front surfaces S7, objective lens four rear surfaces S8, objective lens five front surfaces S9, objective lens five rear surfaces S10, objective lens six front surfaces S11, objective lens six glued surfaces S12, objective lens six rear surfaces Surface S13, front surface S14 of objective lens seven, rear surface S15 of objective lens seven, front surface S16 of optical filter, rear surface S17 of optical filter.

The ratio of the combined focal length Fa of the front group lens to the combined focal length Fb of the rear group lens satisfies -2≥Fa/Fb≥-23; where Fa is the combined focal length value of the front group lens, and Fb is the combined focal length of the rear group lens value. Based on the focal length ratio, the vehicle lens has the characteristics of small F number, clear image, and horizontal field of view greater than or equal to 120°.

Above-mentioned vehicle-mounted lens, front group lens 1 comprises successively from object side to image side: objective lens one 1-1, objective lens two 1-2 and objective lens three 1-3; Objective lens one 1-1 has negative refractive power, and objective lens The first front surface S1 is convex; the second objective lens 1-2 has negative refractive power, and the front surface S3 of the second objective lens is concave; the third objective lens 1-3 has positive refractive power and is a biconvex lens. After the imaging light beam enters the front group lens 1, it passes through the objective lens one 1-1, the objective lens two 1-2 and the objective lens three 1-3 in sequence.

In this embodiment, the components of the front group lens 1 of the vehicle-mounted lens should also meet the following conditions:

The objective lens 1-1 also satisfies: N1≥1.7, V1≤50; wherein N1 is the refractive index of the objective lens 1-1, and V1 is the Abbe number of the objective lens 1-1;

The objective lens 1-2 also satisfies: N2≥1.7, V2≤50; wherein N2 is the refractive index of the objective lens 1-2, and V2 is the Abbe number of the objective lens 1-2;

The objective lens 3 1-3 also satisfies: N3≥1.7, V3≤50; where N3 is the refractive index of the objective lens 3 1-3, and V3 is the Abbe number of the objective lens 3 1-3.

Above-mentioned vehicle lens, rear group lens 3 comprises successively from object side to image side: objective lens four 3-1, objective lens five 3-2, objective lens six 3-3 and objective lens seven 3-4; Objective lens four 3-1, have positive The optical power is a meniscus lens, and the rear surface S8 of the objective lens four is a convex surface; the objective lens five 3-2 has a positive optical power, and is a biconvex lens; the objective lens six 3-3 has a negative optical power, and is a Cemented mirror, is made up of objective lens six positive lenses 3-3a and objective lens six negative lenses 3-3b; Objective lens six positive lenses 3-3a, has positive refractive power, is a biconvex lens; Objective lens six negative lenses 3-3b, have Negative refractive power is a biconcave lens; objective lens 7 3-4 has positive refractive power and is a meniscus lens. The front surface S14 of objective lens 7 is convex. The imaging light beam enters the rear group lens 3, and passes through the objective lens four 3-1, the objective lens five 3-2, the objective lens six 3-3 and the objective lens seven 3-4 in sequence.

In this embodiment, the constituent elements of the rear group lens 3 of the vehicle-mounted lens should also meet the following conditions:

The objective lens 4 3-1 also satisfies: N4≤1.6, V4≥70; wherein N4 is the refractive index of the objective lens 4 3-1, and V4 is the Abbe number of the objective lens 4 3-1;

The objective lens five 3-2 also satisfies: N5≥1.7, V5≤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 six positive lens 3-3a also satisfies: N positive ≥ 1.7, V positive ≤ 50; wherein N positive is the refractive index of the objective six positive lens 3-3a, V positive is the Abbe of the objective six positive lens 3-3a number; objective lens six negative lenses 3-3b also meet: N negative ≥ 1.7, V negative ≤ 50; wherein N is positive the refractive index of objective lens six negative lenses 3-3b, and V is positive Abbe of objective lens six negative lenses 3-3b number;

The objective lens 7 3-4 also satisfies: N7≥1.7, V7≤50; where N7 is the refractive index of the objective lens 7 3-4, and V7 is the Abbe number of the objective lens 7 3-4.

In this embodiment, the components of the front group lens 1 of the vehicle-mounted lens adopt a coaxial design; the components of the rear group lens 3 adopt a coaxial design; Coaxial design is also used.

In this embodiment, the vehicle-mounted lens also needs to meet the following conditions: 35mm≥TTL≥20mm; wherein, the TTL represents the vertical distance of the vehicle-mounted lens from the front group lens 1 to the image plane 5, that is, the vertical distance of the vehicle-mounted lens Optical total length.

In the present embodiment, the objective lens two 1-2 and the objective lens seven 3-4 of the vehicle-mounted lens are aspheric lenses, and any aspheric surface satisfies the following formula:

Among them, Z is the height loss of the aspheric surface along the optical axis at the position of the radius y of the clear aperture, that is, the axial distance from the y position of the aperture radius to the apex of the aspheric surface; R is the curvature radius of the central spherical surface; K is the quadratic Surface coefficient; A, B, C, D are high-order aspheric coefficients respectively.

In the vehicle-mounted lens in this embodiment, objective lens one 1-1 selects the crown material with good chemical properties and strong corrosion resistance, which can improve the adaptability of the vehicle-mounted lens in harsh environments such as sand and stone and salt spray. Objective lens two 1-2 and objective lens Seven 3-4 selects low-softening molded materials, objective lens three 1-3, objective lens four 3-1, objective lens five 3-2 and objective lens six 3-3 use glass materials, and the design of all glass can reduce image plane drift and improve Temperature adaptability of vehicle lens.

The optical filter 4 in this embodiment is located between the rear group lens 3 and the imaging surface 5 . The filter 4 is used to control the transmission spectrum width of the light radiation, cut off the non-imaging spectrum, and improve the contrast of the image plane. The imaging broad spectrum passes through the front group objective lens 1, the diaphragm 2, and the rear group objective lens 3, and then enters the filter 4, and the imaging spectrum coming out of the filter 4 converges on the image plane 5.

In one embodiment of the present invention, objective lens one 1-1, objective lens two 1-2, objective lens three 1-3, diaphragm 2, objective lens four 3-1, objective lens five 3-2, objective lens six 3-3 and objective lens 7.3-4 The radius of curvature r, central thickness d, refractive index N and Abbe number V of each side meet the following table:

Wherein the front surface S3 and the rear surface S4 of the objective lens two 1-2, the front surface S14 and the rear surface S15 of the objective lens seven 3-4 are aspherical surfaces, and its quadric surface coefficient K, high-order aspheric surface coefficients A, B, C, D is shown in the table below:

In this embodiment, the vehicle-mounted lens that satisfies the above conditions has a focal length of f'=3.6, an F-number=1.6, and a total optical length TTL from the front lens group to the image plane=30mm.

The optical performance simulation of the vehicle-mounted lens in this embodiment is carried out, and its modulation transfer function characteristic curve is shown in Figure 2, the distortion characteristic curve is shown in Figure 3, the vertical axis chromatic aberration curve is shown in Figure 4, and the axial chromatic aberration curve is shown in Figure 5 As shown, the relative illuminance curve is shown in Figure 6.

Fig. 2 is the optical transfer function curve of the vehicle lens in this embodiment, the abscissa is the spatial frequency, the unit is lp/mm, and the ordinate is the modulation degree of the image point and the object point. Curve F1: Diff.Limit is the diffraction limit of the vehicle lens, which is also the limit resolution; the transfer function curve corresponding to the on-axis light when the field of view is 0° is F1, and F2, F3, F4, F5, and F6 are off-axis The transfer function curve corresponding to the field of view, F2 corresponds to a field of view of 30°, F3 corresponds to a field of view of 36°, F4 corresponds to a field of view of 50°, F5 corresponds to a field of view of 50°, and F6 corresponds to The field of view is 61.7°. It can be seen from Fig. 2 that at a spatial frequency of 85 lp/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 of view>0.8, the optical transfer function of the largest field of view>0.73, and full view The optical transfer functions of the fields are all between 0.73 and 0.8, close to the diffraction limit.

FIG. 3 is the 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 for distortion of a large field of view.

Fig. 4 is the axial chromatic aberration curve of the vehicle-mounted lens in this embodiment, the abscissa is the axial spherical aberration, the unit is mm, the ordinate is the aperture, and 1 represents the normalized maximum aperture. In Figure 4, the c curve represents the chromatic spherical aberration of the light with a wavelength of 470nm in the vehicle lens, wherein the d curve represents the chromatic spherical aberration of the light with a wavelength of 550nm in the vehicle lens, and the e curve represents the chromatic spherical aberration of the light with a wavelength of 670nm in the vehicle lens The chromospheric aberration in the three spectra is consistent in the full aperture range, and they are all under good control. Axial chromatic aberration is the difference of chromospheric aberration, and the final axial chromatic aberration is <0.013mm.

Fig. 5 is the vertical axis chromatic aberration curve of the vehicle lens in this embodiment, the abscissa is the vertical axis chromatic aberration, the unit is mm, the ordinate is the aperture, and 1 represents the normalized maximum aperture. Curve a in Figure 5 is the vertical axis chromatic aberration between wavelength 470nm and wavelength 670nm, and curve b is the vertical axis chromatic aberration between wavelength 470nm and wavelength 550nm. axial chromatic aberration. It can be seen from curve 4 that the final axial chromatic aberration is less than 0.006mm.

FIG. 6 is the relative illuminance curve of the vehicle-mounted lens in this embodiment, the abscissa is the field of view angle, and the ordinate is the relative illuminance. The relative illuminance is used to evaluate the brightness uniformity of the image plane, which is the ratio of the off-axis field of view to the on-axis field of view. The vehicle-mounted lens in this embodiment has a relative illuminance of 73% when the maximum field of view is 61.7°.

Compared with the technology in 201810771948.5, this embodiment scheme increases the focal length, but the F number decreases, so its resolution and relative illuminance have been greatly improved; in addition, it is similar to the technology in 200920122166.5 Although the F number is the same, the field of view is increased, which expands the imaging range and the use environment. The solution of this embodiment provides a vehicle-mounted lens with clear images, good image contrast, and suitable for high-definition imaging with an 8MP chip.

It can be seen from the above technical solution that the vehicle-mounted lens optical system of the present invention adopts the combination of spherical surface and aspheric surface, has large aperture imaging performance, and provides a special form of chromatic aberration and distortion for the lens, ensuring a horizontal 120° field of view While improving the resolution capability of the entire group of lenses, the length and aperture of the lens have also been effectively controlled, and the use of small aperture lenses has achieved large target surface imaging; the expansion coefficient and stability of materials have been considered during the design process. The athermalization design idea was introduced, and the optical-mechanical athermalization design was realized through the matching of optical materials and structural materials, which ensured the imaging quality of the system within the temperature range of -40°C to 115°C, and effectively reduced the It solves the problems of image plane offset and image quality degradation, and can meet the needs of different usage environments.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A vehicle-mounted lens optical system suitable for 8MP chips is characterized in that it comprises coaxially arranged from the front object side to the rear image side: front group lens (1), diaphragm (2), rear group lens (3 ), optical filter (4) and imaging surface (5); the front group lens (1) has a negative refractive power; the rear group lens (3) has a positive refractive power; the diaphragm (2) is located at the front Between the group lens (1) and the rear group lens (3), the center of the aperture of the diaphragm (2) is located on the optical axis; the imaging surface (5) is located at the rear side of the rear group lens (3), and the optical filter (4 ) between the rear group lens (3) and the imaging surface (5); the ratio of the combined focal length Fa of the front group lens (1) and the combined focal length Fb of the rear group lens (3) satisfies -2≥Fa/Fb≥ -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 vehicle-mounted lens optical system suitable for 8MP chips as claimed in claim 1, wherein the front group lens (1) comprises in turn from the object side to the image side: objective lens one (1-1), objective lens two (1-2) and objective lens three (1-3); objective lens one (1-1), has negative optical power, and the front surface of objective lens one is convex; objective lens two (1-2), has negative optical focus degree, and the front surface of the second objective lens is concave; the third objective lens (1-3) has positive refractive power and is a biconvex lens. 3. The vehicle-mounted lens optical system applicable to 8MP chips as claimed in claim 2, wherein said objective lens one (1-1) also satisfies: N1≥1.7, V1≤50; wherein N1 is objective lens one (1-1) -1) the refractive index, V1 is the Abbe number of objective lens one (1-1); said objective lens two (1-2) also meets: N2≥1.7, V2≤50; Wherein N2 is objective lens two (1-2 ), V2 is the Abbe number of objective lens two (1-2); said objective lens three (1-3) also satisfies: N3≥1.7, V3≤50; wherein N3 is objective lens three (1-3) Refractive index, V3 is the Abbe number of objective lens three (1-3). 4. The vehicle-mounted lens optical system suitable for 8MP chips as claimed in claim 3, wherein the rear group lens (3) comprises in turn from the object side to the image side: objective lens four (3-1), objective lens five (3-2), objective lens six (3-3) and objective lens seven (3-4); Objective lens four (3-1), has positive refractive power, is a meniscus lens, and objective lens four rear surfaces are convex surfaces; Objective lens five (3-2), has positive refractive power, is a biconvex lens; Objective lens six (3-3) has negative optical power, is a cemented lens, is made up of objective lens six positive lenses (3-3a) and Objective lens six negative lenses (3-3b) are cemented together; objective lens six positive lenses (3-3a) have positive refractive power and are a biconvex lens; objective lens six negative lenses (3-3b) have negative refractive power , is a biconcave lens; objective lens seven (3-4), has positive refractive power, is a meniscus lens, and the front surface of the objective lens seven is convex. 5. The vehicle-mounted lens optical system applicable to 8MP chips as claimed in claim 4, wherein said objective lens 4 (3-1) also satisfies: N4≤1.6, V4≥70; wherein N4 is objective lens 4 (3-1) -1) the refractive index, V4 is the Abbe number of objective lens four (3-1); said objective lens five (3-2) also meets: N5≥1.7, V5≤50; Wherein N5 is objective lens five (3-2 ), V5 is the Abbe number of the objective lens five (3-2); the objective lens six positive lens (3-3a) also satisfies: N positive ≥ 1.7, V positive ≤ 50; wherein N positive is the objective lens six positive The refractive index of the lens (3-3a), V positive is the Abbe number of the six positive lenses of the objective lens (3-3a); the six negative lenses of the objective lens (3-3b) also satisfy: N negative ≥ 1.7, V negative ≤ 50; wherein N positively is the refractive index of objective lens six negative lenses (3-3b), and V positively is the Abbe number of objective lens six negative lenses (3-3b); Described objective lens seven (3-4) also satisfies: N7≥1.7, V7 ≤50; where N7 is the refractive index of objective lens 7 (3-4), and V7 is the Abbe number of objective lens 7 (3-4). 6. The vehicle-mounted lens optical system suitable for 8MP chips as claimed in claim 5, wherein the vehicle-mounted lens optical system satisfies: 35mm≥TTL≥20mm; wherein, TTL means from the front group lens (1) to the image plane (5) The vertical distance, that is, the total optical length of the vehicle lens. 7. The vehicle-mounted lens optical system applicable to 8MP chips as claimed in claim 6, wherein the objective lens two (1-2) and objective lens seven (3-4) of the vehicle-mounted lens are aspherical lenses, and any An aspheric surface satisfies the following formula:

Among them, Z is the height loss of the aspheric surface along the optical axis at the position of the radius y of the clear aperture, that is, the axial distance from the y position of the aperture radius to the apex of the aspheric surface; R is the curvature radius of the central spherical surface; K is the quadratic Surface coefficient; A, B, C, D are high-order aspheric coefficients respectively. 8. the vehicle-mounted lens optical system applicable to 8MP chips as claimed in claim 7, is characterized in that, described objective lens one (1-1) selects crown material for use, objective lens two (1-2) and objective lens seven (3- 4) Low-softening molding materials are selected, and the objective lens three (1-3), the objective lens four (3-1), the objective lens five (3-2) and the objective lens six (3-3) use glass materials. 9. The vehicle-mounted lens optical system applicable to 8MP chips as claimed in claim 8, wherein said objective lens one (1-1), objective lens two (1-2), objective lens three (1-3), light Radius of curvature r, central thickness d, and refractive index N of each side of diaphragm (2), objective lens four (3-1), objective lens five (3-2), objective lens six (3-3) and objective lens seven (3-4) and the Abbe number V satisfy the following table: Wherein, in the front group lens 1 and the rear group lens 3, the front surface and the rear surface of each lens are respectively made of objective lens one front surface S1, objective lens one rear surface S2, objective lens two front surface S3, objective lens two rear surface S4, objective lens three front surfaces Surface S5, objective lens 3 rear surface S6, objective lens 4 front surface S7, objective lens 4 rear surface S8, objective lens 5 front surface S9, objective lens 5 rear surface S10, objective lens 6 front surface S11, objective lens 6 glued surface S12, objective lens 6 rear surface S13 , the representation of the front surface S14 of the objective lens 7 and the rear surface S15 of the objective lens 7;

10. The vehicle-mounted lens optical system applicable to 8MP chips as claimed in claim 9, characterized in that, the front surface S3 and the rear surface S4 of the objective lens two (1-2), the seven (3-4) of the objective lens The front surface S14 and the rear surface S15 are aspheric surfaces, and their quadric surface coefficient K, high-order aspheric surface coefficients A, B, C, and D are shown in the following table: Face number K A B C D. S3 0.036 0.00176 0.0000225 — — S4 -11 0.00086 0.0000125 — — S14 2.3 -0.00193 -0.00004 — — S15 3 -0.000766 -0.000073 — — .

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