CN210742595U - 0.95mm vehicle-mounted high-definition all-round-looking optical system - Google Patents
0.95mm vehicle-mounted high-definition all-round-looking optical system Download PDFInfo
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- CN210742595U CN210742595U CN201921156959.9U CN201921156959U CN210742595U CN 210742595 U CN210742595 U CN 210742595U CN 201921156959 U CN201921156959 U CN 201921156959U CN 210742595 U CN210742595 U CN 210742595U
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Abstract
The utility model relates to an on-vehicle high definition looking around optical system of 0.95mm, include along light incident light path from preceding first spherical lens, first aspheric lens, second spherical lens, diaphragm, second aspheric lens, third aspheric lens and the fourth aspheric lens that sets up backward at interval in proper order, wherein first spherical lens, first aspheric lens are meniscus negative lens, and second spherical lens are biconvex positive lens, second aspheric lens, third aspheric lens are airtight to constitute the cementing group, and fourth aspheric lens is biconvex positive lens. The utility model has the advantages of reasonable structure, simple operation, clear image quality, low temperature drift and the like.
Description
Technical Field
The utility model relates to an on-vehicle high definition look around optical system of 0.95 mm.
Background
The vehicle-mounted panoramic lens is generally applied to a vehicle-mounted auxiliary driving system and is required to have the characteristics of high image quality, wide imaging angle, small size and the like. Many vehicle-mounted panoramic lenses in the market today adopt a glass-plastic design scheme to complement the disadvantages of insufficient imaging quality and large volume brought by full glass design. With the development of the automobile industry, the requirements for miniaturization and high image quality are further increased. The conventional vehicle-mounted all-round lens has the defects of common imaging effect, insufficient night brightness, large high-low temperature drift and the like.
Disclosure of Invention
In view of this, the utility model aims at providing a 0.95mm vehicle-mounted high definition looks around optical system, rational in infrastructure, easy and simple to handle has like characteristics such as clear, the temperature drift of matter.
The technical scheme of the utility model is that: a0.95 mm vehicle-mounted high-definition all-round looking optical system comprises a first spherical lens, a first aspheric lens, a second spherical lens, a diaphragm, a second aspheric lens, a third aspheric lens and a fourth aspheric lens which are sequentially arranged at intervals from front to back along a light incident light path; the first spherical lens and the first aspheric lens are meniscus negative lenses, the second spherical lens is a double convex positive lens, and the first spherical lens, the first aspheric lens and the second spherical lens form a front group lens with negative focal power; the second aspheric lens is a biconcave negative lens, and the third aspheric lens is a biconvex positive lens; the second aspheric lens and the third aspheric lens are tightly connected to form a bonding group, the fourth aspheric lens is a double-convex positive lens, and the second aspheric lens, the third aspheric lens and the fourth aspheric lens form a rear group lens with positive focal power.
Further, an air space between the first spherical lens and the first aspheric lens is 1.65mm, an air space between the first aspheric lens and the second spherical lens is 1.5mm, an air space between the second spherical lens and the second aspheric lens is 0.35mm, and an air space between the third aspheric lens and the fourth aspheric lens is 0.1 mm.
Further, the total focal length of the optical system is set to f, and the focal lengths of the first spherical lens, the first aspheric lens, the second spherical lens, the second aspheric lens, the third aspheric lens, and the fourth aspheric lens are set in this order
、
、
、
、
、
Wherein
、
、
、
And
the following relationship is satisfied:
further, the refractive index of the first spherical lens is set to Nd1Setting the refractive index of the first aspherical lens to Nd2Setting the refractive index of the second spherical lens to Nd3Setting the refractive index of the second aspherical lens to Nd4Setting the refractive index of the third aspherical lens to Nd5Setting the refractive index of the fourth aspherical lens to Nd6The refractive index of each lens satisfies the following relationship: n is a radical ofd1≥1.7；Nd2≥1.5；Nd3≥1.8；Nd4≥1.6；Nd5≥1.5；Nd6≥1.5。
Further, the abbe number of the first spherical lens is set to Vd1Setting Abbe coefficient of the first aspheric lens to Vd2The Abbe's number of the second spherical lens is set to Vd3Setting Abbe coefficient of the second aspheric lens to Vd4Setting Abbe coefficient of the third aspheric lens to Vd5Setting the refractive index of the fourth aspherical lens to Vd6The abbe number of each lens satisfies the following relationship: vd1≥45；Vd2≥50；Vd3≤25；Vd4≤30；Vd5≥50；Vd6≥50。
Furthermore, the first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens are all made of plastic materials.
Furthermore, a filter is arranged at the rear end of the fourth aspheric lens.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model has simple and reasonable design, not only reduces the assembly sensitivity by introducing a group of aspheric lens cementing group to correct spherical aberration, chromatic aberration and high-grade aberration, thereby improving the yield, being beneficial to large-scale production, improving the imaging quality and achieving the camera shooting level of two million pixels; and the focal power of each lens is reasonably calculated, and an aspheric lens is added into the two glass lenses to correct the focus drift of the optical system in high-temperature and low-temperature environments, so that the imaging is clear in a wider temperature range from-40 ℃ to +85 ℃.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic view of an optical structure according to an embodiment of the present invention;
fig. 2 is a graph of visible light MTF of an embodiment of the present invention;
FIG. 3 is a high temperature-40 ℃ MTF defocus curve of an embodiment of the present invention;
fig. 4 is a MTF defocus curve at +85 ℃ for high temperature;
in the figure: 100-front group lens; 110-a first spherical lens; 120-a first aspheric lens; 130-a second spherical lens; 200-rear group lens; 210-a second aspheric lens; 220-a third aspheric lens; 230-a fourth aspheric lens; 300-a diaphragm; 400-optical filter.
Detailed Description
As shown in fig. 1, a 0.95mm vehicle-mounted high-definition panoramic optical system includes a first spherical lens, a first aspheric lens, a second spherical lens, a diaphragm, a second aspheric lens, a third aspheric lens and a fourth aspheric lens which are sequentially arranged along a light incident path from front to back at intervals; the first spherical lens and the first aspheric lens are meniscus negative lenses, the second spherical lens is a double convex positive lens, and the first spherical lens, the first aspheric lens and the second spherical lens form a front group lens with negative focal power; the second aspheric lens is a biconcave negative lens, and the third aspheric lens is a biconvex positive lens; the second aspheric lens and the third aspheric lens are tightly connected to form a bonding group, the fourth aspheric lens is a double-convex positive lens, and the second aspheric lens, the third aspheric lens and the fourth aspheric lens form a rear group lens with positive focal power.
In this embodiment, an air space between the first spherical lens and the first aspheric lens is 1.65mm, an air space between the first spherical lens and the second spherical lens is 1.5mm, an air space between the second spherical lens and the second aspheric lens is 0.35mm, and an air space between the third aspheric lens and the fourth aspheric lens is 0.1 mm.
In this embodiment, the total focal length of the optical system is set to f, and the focal lengths of the first spherical lens, the first aspheric lens, the second spherical lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens are set to f in this order
、
、
、
、
、
Wherein
、
、
、
And
the following relationship is satisfied:
in this embodiment, the refractive index of the first spherical lens is set to Nd1Setting the refractive index of the first aspherical lens to Nd2Setting the refractive index of the second spherical lens to Nd3Setting the refractive index of the second aspherical lens to Nd4Setting the refractive index of the third aspherical lens to Nd5Setting the refractive index of the fourth aspherical lens to Nd6The refractive index of each lens satisfies the following relationship: n is a radical ofd1≥1.7；Nd2≥1.5；Nd3≥1.8；Nd4≥1.6；Nd5≥1.5；Nd6≥1.5。
In this embodiment, the abbe number of the first spherical lens is setIs a Vd1Setting Abbe coefficient of the first aspheric lens to Vd2The Abbe's number of the second spherical lens is set to Vd3Setting Abbe coefficient of the second aspheric lens to Vd4Setting Abbe coefficient of the third aspheric lens to Vd5Setting the refractive index of the fourth aspherical lens to Vd6The abbe number of each lens satisfies the following relationship: vd1≥45；Vd2≥50；Vd3≤25；Vd4≤30；Vd5≥50；Vd6≥50。
In this embodiment, the first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens are all made of plastic material.
In this embodiment, an optical filter is disposed at the rear end of the fourth aspheric lens.
TABLE 1 specific lens parameters are as follows
In the embodiment, six lenses are taken as an example, and by reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the field angle of the lens is effectively enlarged, the total length of the lens is shortened, and the small distortion and the high illumination of the lens are ensured; meanwhile, various aberrations are corrected, and the resolution and the imaging quality of the lens are improved. Each aspherical surface type Z is defined by the following formula:
wherein the content of the first and second substances,
is aspheric and has a height of
The distance from the aspheric surface vertex is higher when the aspheric surface is at the position of (1);
is the paraxial curvature of the aspheric surface,
(i.e., paraxial curvature)
Is the radius of curvature in Table 1 above
The reciprocal of (d);
is the conic constant; A. b, C, D, E are all high order term coefficients. Table 2 below shows a conic constant k and high-order term coefficients A, B, C, D, E that can be used for each aspherical lens surface in the present embodiment.
TABLE 2 aspherical lens parameters
In this embodiment, the technical indexes of the optical system are as follows:
(1) focal length: EFFL =0.95 mm; (2) aperture F = 2.0; (3) the field angle: 2w is more than or equal to 200 degrees; (4) optical distortion: < -120%; (5) the diameter of the imaging circle is larger than phi 4; (6) the working wave band is as follows: 420-700 nm; (7) the total optical length TTL is less than or equal to 12.9mm, and the optical back intercept BFL is more than or equal to 2 mm; (8) the lens is suitable for a CCD or CMOS camera with 200 ten thousand pixels.
The specific implementation process comprises the following steps: (1) the light rays sequentially pass through the first spherical lens, the first aspheric lens, the second spherical lens, the diaphragm, the second aspheric lens, the third aspheric lens and the fourth aspheric lens from front to back and reach an image surface for imaging, when the light rays pass through the front group of lenses, the negative focal power of the front group of lenses can correct the positive focal power aberration of the rear group of lenses, meanwhile, the first aspheric lens is arranged between the first spherical lens and the second spherical lens by the front group of lenses, and when the light rays pass through, the high and low temperature focal drift of the whole optical system can be compensated; (2) the first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens can correct all high-grade aberration and spherical aberration, the refractive index and focal power of the whole lens are approximately distributed in proportion, the balance of the incident angles of the lenses of the front group of lenses and the lenses of the rear group of lenses is ensured, the sensitivity of the lens is further reduced, and meanwhile, the four aspheric lenses are four plastic aspheric surfaces and have good image quality; (3) the front group of lenses has negative focal power, the rear group of lenses has positive focal power, when light enters, the view field angle can reach 200 degrees, and the clear picture can be ensured in severe environments with different temperatures, so that the normal use can be ensured in high-temperature and low-temperature environments.
As can be seen from fig. 2, the MTF of the optical system in the visible light band is well performed, and the requirement of resolution of two million high definition can be met. FIGS. 3 and 4 are MTF defocusing curves of the optical system at a low temperature of-40 ℃ and a high temperature of +85 ℃, wherein the defocusing amount of the low temperature is 14 μm, the defocusing amount of the high temperature is 6 μm, the MTF attenuation is small, and the high and low temperature image definition is completely met.
Above-mentioned operation flow and software and hardware configuration only do as the preferred embodiment of the utility model discloses a not therefore restrict the patent scope of the utility model, all utilize the utility model discloses the equivalent transform of doing of description and attached drawing content, or directly or indirectly use in relevant technical field, all the same reason is included in the patent protection scope of the utility model.
Claims (7)
1. The utility model provides an on-vehicle high definition all around optical system of 0.95mm which characterized in that: the optical lens comprises a first spherical lens, a first aspheric lens, a second spherical lens, a diaphragm, a second aspheric lens, a third aspheric lens and a fourth aspheric lens which are sequentially arranged at intervals from front to back along a light incident light path;
the first spherical lens and the first aspheric lens are meniscus negative lenses, the second spherical lens is a double convex positive lens, and the first spherical lens, the first aspheric lens and the second spherical lens form a front group lens with negative focal power;
the second aspheric lens is a biconcave negative lens, and the third aspheric lens is a biconvex positive lens;
the second aspheric lens and the third aspheric lens are tightly connected to form a bonding group, the fourth aspheric lens is a double-convex positive lens, and the second aspheric lens, the third aspheric lens and the fourth aspheric lens form a rear group lens with positive focal power.
2. The 0.95mm vehicle-mounted high-definition all-round optical system according to claim 1, characterized in that: the air space between the first spherical lens and the first aspheric lens is 1.65mm, the air space between the first aspheric lens and the second spherical lens is 1.5mm, the air space between the second spherical lens and the second aspheric lens is 0.35mm, and the air space between the third aspheric lens and the fourth aspheric lens is 0.1 mm.
3. The 0.95mm vehicle-mounted high-definition all-round optical system according to claim 2, characterized in that: the total focal length of the optical system is set to f, and the focal lengths of the first spherical lens, the first aspheric lens, the second spherical lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens are set to f in sequence
、
、
、
、
、
Wherein
、
、
、
And
the following relationship is satisfied:
4. the 0.95mm vehicle-mounted high-definition all-round optical system according to claim 3, characterized in that: setting the refractive index of the first spherical lens to Nd1Setting the refractive index of the first aspherical lens to Nd2Setting the refractive index of the second spherical lens to Nd3Setting the refractive index of the second aspherical lens to Nd4Refracting the third aspheric lensThe ratio is set to Nd5Setting the refractive index of the fourth aspherical lens to Nd6The refractive index of each lens satisfies the following relationship: n is a radical ofd1≥1.7；Nd2≥1.5；Nd3≥1.8；Nd4≥1.6；Nd5≥1.5；Nd6≥1.5。
5. The 0.95mm vehicle-mounted high-definition all-round optical system according to claim 4, characterized in that: setting Abbe's coefficient of the first spherical lens to Vd1Setting Abbe coefficient of the first aspheric lens to Vd2The Abbe's number of the second spherical lens is set to Vd3Setting Abbe coefficient of the second aspheric lens to Vd4Setting Abbe coefficient of the third aspheric lens to Vd5Setting the refractive index of the fourth aspherical lens to Vd6The abbe number of each lens satisfies the following relationship: vd1≥45；Vd2≥50；Vd3≤25；Vd4≤30；Vd5≥50；Vd6≥50。
6. The 0.95mm vehicle-mounted high-definition all-round optical system according to claim 5, characterized in that: the first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens are all made of plastic materials.
7. The 0.95mm vehicle-mounted high-definition all-round optical system according to claim 6, characterized in that: and the rear end of the fourth aspheric lens is provided with an optical filter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333591A (en) * | 2019-07-23 | 2019-10-15 | 福建福光天瞳光学有限公司 | A kind of 0.95mm vehicle-mounted high-definition looks around optical system and its imaging method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333591A (en) * | 2019-07-23 | 2019-10-15 | 福建福光天瞳光学有限公司 | A kind of 0.95mm vehicle-mounted high-definition looks around optical system and its imaging method |
| CN110333591B (en) * | 2019-07-23 | 2023-08-15 | 福建福光天瞳光学有限公司 | 0.95mm vehicle-mounted high-definition looking-around optical system and imaging method thereof |
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