CN211454081U - 2.8mm wide-angle optical system - Google Patents
2.8mm wide-angle optical system Download PDFInfo
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- CN211454081U CN211454081U CN201922318693.XU CN201922318693U CN211454081U CN 211454081 U CN211454081 U CN 211454081U CN 201922318693 U CN201922318693 U CN 201922318693U CN 211454081 U CN211454081 U CN 211454081U
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Abstract
The utility model relates to a 2.8mm wide angle optical system, include along the optical axis by thing side to picture side interval first lens, second lens, diaphragm, third lens, fourth lens, fifth lens and the sixth lens that sets up in proper order, the material of six lens is glass. The utility model has reasonable design, large aperture and high imaging quality, and can reach the camera level of two million pixels; total length and back coke length; the temperature compensation function is realized, and the imaging is kept clear within the temperature range of-40 ℃ to 85 ℃.
Description
Technical Field
The utility model relates to a 2.8mm wide angle optical system.
Background
The automobile data recorder is also called as an automobile black box and is used for recording the operation of a driver and the running condition of an automobile in an automobile accident, can be used as an accident analysis basis, and is an important supervision means for examining the illegal operation of the driver. The use of the automobile data recorder can greatly reduce the accident rate and improve the accident handling efficiency.
With the development of Advanced Driver Assistance Systems (ADAS), the market demand for automobile data recorders is also increasing. Miniaturization, intellectualization, high definition and wide angle, high integration and low cost are the development trend of the automobile data recorder products nowadays.
In view of vehicle event data recorder's development trend, the utility model aims at providing an on-vehicle optical lens of 2.8mm wide angle not only has the imaging image quality of high definition, also can satisfy the big light ring of wide angle, miniaturized requirement simultaneously, has good high low temperature compensation function in addition to satisfy higher car sensing demand.
SUMMERY OF THE UTILITY MODEL
The utility model aims at above weak point, provide a simple structure's 2.8mm wide angle optical system.
The technical scheme of the utility model be, a 2.8mm wide angle optical system, include along the optical axis by thing side to picture side interval first lens, second lens, diaphragm, third lens, fourth lens, fifth lens and the sixth lens that sets up in proper order, the material of six lenses is glass.
Furthermore, the first lens is a meniscus negative lens, the second lens is a biconvex positive lens, the meniscus negative lens and the biconvex positive lens form a front group lens with negative focal power, and the image side surface of the first lens is a concave surface.
Furthermore, the third lens is a positive meniscus lens, the fourth lens is a double convex positive lens, the fifth lens is a negative meniscus lens, the fourth lens and the fifth lens are tightly connected to form a lens glue combination, the sixth lens is a double convex positive lens, the fourth lens forms a rear group lens with positive focal power, the object-side surface of the third lens is a concave surface, and the object-side surface of the fifth lens is a concave surface.
Further, the air space between the first lens and the second lens in the front group of lenses is 1.25-1.35 mm, the air space between the third lens and the fourth lens is 0.05-0.15 mm, the air space between the fifth lens and the sixth lens is 0.05-0.15 mm, and the air space between the front group of lenses and the rear group of lenses is 0.40-0.50 mm.
Furthermore, the focal length of an optical system composed of the front group lens and the rear group lens is f, and the focal lengths of the first lens, the second lens and the rear group lens are respectively f1、f2The focal length of the front group of lenses satisfies f1、f2And f satisfy the following ratio:
-1.5＜f1/f＜-1，3.5＜f2/f＜4。
furthermore, the focal length of an optical system composed of the front group lens and the rear group lens is f, and the focal lengths of the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f3、f4、f5、f6The focal length of the rear group lens satisfies f3、f4、f5、f6And f satisfy the following ratio:
3.5＜f3/f＜4,-0.5＜f4/f5＜-0.45，3＜f6/f＜5。
further, the first lens satisfies the relation: n is a radical ofd≥1.6，VdNot less than 50; the second lens satisfies the relation: n is a radical ofd≥1.9，VdLess than or equal to 20; the third lens satisfies the relation: n is a radical ofd≥1.7，VdLess than or equal to 50; the fourth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 65; the fifth lens satisfies the relation: n is a radical ofd≥1.9，VdLess than or equal to 20; the sixth lens satisfies the relation: n is a radical ofd≥1.8，VdLess than or equal to 45; wherein N isdIs refractive index, VdAbbe constant.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. by adopting a 6G design, the high-grade aberration and chromatic aberration of the whole optical system are effectively corrected through reasonable material selection and optical design. The imaging quality of the lens is high, the target surface is large, and the camera shooting level of two million pixels can be achieved.
2. The lens aperture is large, the F number is more than or equal to 1.9, the designed field of view is large, and the angle can reach 154 degrees.
3. Have the temperature compensation function, under the prerequisite according to the utility model provides a lens combination, material combination, the utility model discloses a camera lens has guaranteed that the best image plane of camera lens is unchangeable within the temperature range of-40 ℃ - +85 ℃.
Drawings
The following describes the present invention with reference to the accompanying 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 graph of defocus at-40 ℃ in the embodiment of the present invention;
fig. 4 is a defocus graph at +85 ℃ according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
As shown in fig. 1 to 4, a 2.8mm wide-angle optical system includes a first lens a1, a second lens a2, a stop C, a third lens B1, a fourth lens B2, a fifth lens B3 and a sixth lens B4, which are disposed in sequence from an object side to an image side along an optical axis, and the six lenses are made of glass.
In this embodiment, the first lens element is a negative meniscus lens element, the second lens element is a double convex positive lens element, and the two lens elements form a front lens group with negative focal power, and the image-side surface of the first lens element is a concave surface.
In this embodiment, the third lens element is a positive meniscus lens element, the fourth lens element is a double convex positive lens element, the fifth lens element is a negative meniscus lens element, the fourth lens element and the fifth lens element are joined together to form a lens assembly, the sixth lens element is a double convex positive lens element, the fourth lens element and the fifth lens element form a rear lens assembly with positive optical power, the object-side surface of the third lens element is a concave surface, and the object-side surface of the fifth lens element is a concave surface.
In the embodiment, the air space between the first lens and the second lens in the front group of lenses is 1.25-1.35 mm, the air space between the third lens and the fourth lens is 0.05-0.15 mm, the air space between the fifth lens and the sixth lens is 0.05-0.15 mm, and the air space between the front group of lenses and the rear group of lenses is 0.40-0.50 mm.
In this embodiment, the focal length of the optical system composed of the front lens group and the rear lens group is f, and the focal lengths of the first lens element, the second lens element and the rear lens element are f1、f2The focal length of the front group of lenses satisfies f1、f2And f satisfy the following ratio:
-1.5＜f1/f＜-1，3.5＜f2/f＜4。
in this embodiment, the focal length of the optical system composed of the front lens group and the rear lens group is f, and the focal lengths of the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f3、f4、f5、f6The focal length of the rear group lens satisfies f3、f4、f5、f6And f satisfy the following ratio:
3.5＜f3/f＜4,-0.5＜f4/f5＜-0.45，3＜f6/f＜5。
through right the utility model discloses the optical system's that forms focal power carries out rational distribution according to above proportion, and each lens is for system's focus f certain proportion, makes the utility model discloses the optical system who forms obtains reasonable correction and balance at 420 ~ 850 nm's wavelength range's aberration.
In this embodiment, the first lens satisfies the relation: n is a radical ofd≥1.6，VdNot less than 50; the second lens satisfies the relation: n is a radical ofd≥1.9，VdLess than or equal to 20; the third lens satisfies the relation: n is a radical ofd≥1.7，VdLess than or equal to 50; the fourth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 65; the fifth lens satisfies the relation: n is a radical ofd≥1.9，VdLess than or equal to 20; the sixth lens satisfies the relation: n is a radical ofd≥1.8，VdLess than or equal to 45; wherein N isdIs refractive index, VdAbbe constant.
An imaging method of a 2.8mm wide-angle optical system comprises the following steps: the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens from left to right to form an image.
The specific implementation process comprises the following steps: example 1: the air space between the first lens and the second lens in the front group of lenses is 1.29mm, the air space between the third lens and the fourth lens is 0.10mm, the air space between the fifth lens and the sixth lens is 0.099mm, and the air space between the front group of lenses and the rear group of lenses is 0.47 mm; a diaphragm is arranged between the third lens and the fourth lens, the air space between the second lens and the diaphragm is 0.32mm, and the air space between the third lens and the diaphragm is 0.15 mm; a filter D is arranged on the rear side of the fifth lens; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are spherical lenses and are made of glass.
Table 1 shows the radius of curvature R, thickness d, and refractive index N of each lens of the optical lens of example 1dAnd Abbe number Vd。
TABLE 1 detailed lens parameter Table
In this embodiment, the technical indexes achieved by the optical system are as follows:
(1) focal length: EFFL 2.84 mm; (2) aperture F ═ 1.84; (3) the field angle: 2w is more than or equal to 154 degrees; (4) optical distortion: < -74%; (5) the diameter of the imaging circle is larger than phi 6.4; (6) the working wave band is as follows: 420-650 nm; (7) the total optical length TTL is less than or equal to 17.5mm, and the optical back intercept BFL is more than or equal to 5.3 mm; (8) the lens is suitable for two million-pixel CCD or CMOS cameras.
In the present embodiment, a typical front-negative-rear-positive reverse telephoto structure is employed, and the positive power of the rear group lens corrects the negative power aberration of the front group lens. The six spherical lenses correct most high-order aberration through reasonable material selection and optical power proportion distribution; the size of the light incidence angle between the lens of the front group of lenses and the lens of the rear group of lenses is limited, and the image surface curvature of the optical system can be effectively reduced by a smaller light incidence angle.
In the front group lens, a first lens having a high refractive index and a low dispersion is complementary to a second lens having a high refractive index and an ultra-high dispersion, and chromatic aberration of the front group lens is corrected.
In the rear group lens, a fourth lens with low refractive index and low dispersion is complementary with a fifth lens with high refractive index and ultrahigh dispersion, so that the integral chromatic aberration of the imaging system is effectively corrected, the fourth lens has a negative refractive index temperature coefficient and provides a function of compensating the high and low temperature characteristics of the system, and the sixth lens is matched with the front group lens to reduce the field curvature of the whole system.
Through the optical system formed by the lenses, the total length of the optical path is shorter, the size of the lens is small, and the back focus is large; meanwhile, the system has a large aperture and excellent imaging quality, and can meet the requirement of two million pixels on resolution.
As can be seen from FIG. 2, the MTF of the optical system in the visible light band is well-behaved, the MTF value of 0.8 field of view is greater than 0.3 at the spatial frequency of 160pl/mm, and the MTF value of the central field of view is greater than 0.7 at the spatial frequency of 80pl/mm, so that the requirement of two million high definition resolution can be met.
FIGS. 3 and 4 are graphs of MTF defocus at-40 ℃ and +85 ℃ for this optical system, respectively. As can be seen from the figure, the defocusing amount of the central view field of the optical system is 3 μm at-40 ℃, the defocusing amount of the central view field is-3 μm at 85 ℃, the optical system has very excellent high and low temperature characteristics, and the image quality completely meets the use requirements of the vehicle-mounted lens in high and low temperature environments.
The above-mentioned preferred embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (7)
1. A2.8 mm wide angle optical system which characterized in that: the optical lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged at intervals from an object side to an image side along an optical axis, wherein the six lenses are all made of glass.
2. The 2.8mm wide-angle optical system of claim 1, wherein: the first lens is a meniscus negative lens, the second lens is a double convex positive lens, the first lens and the second lens form a front group lens with negative focal power, and the image side surface of the first lens is a concave surface.
3. The 2.8mm wide-angle optical system of claim 1, wherein: the third lens is a positive meniscus lens, the fourth lens is a double convex positive lens, the fifth lens is a negative meniscus lens, the fourth lens and the fifth lens are tightly connected to form a lens gluing group, the sixth lens is a double convex positive lens, the fourth lens forms a rear group lens with positive focal power, the object side surface of the third lens is a concave surface, and the object side surface of the fifth lens is a concave surface.
4. The 2.8mm wide-angle optical system of claim 1, wherein: the air space between the first lens and the second lens in the front group of lenses is 1.25-1.35 mm, the air space between the third lens and the fourth lens is 0.05-0.15 mm, the air space between the fifth lens and the sixth lens is 0.05-0.15 mm, and the air space between the front group of lenses and the rear group of lenses is 0.40-0.50 mm.
5. The 2.8mm wide-angle optical system of claim 1, wherein: the focal length of an optical system consisting of the front group lens and the rear group lens is f, and the focal lengths of the first lens, the second lens and the third lens are respectively f1、f2、f3The focal length of the front group of lenses satisfies f1、f2And f satisfy the following ratio:
-1.5＜f1/f＜-1，3.5＜f2/f＜4。
6. the 2.8mm wide-angle optical system of claim 1, wherein: the focal length of an optical system consisting of the front group lens and the rear group lens is f, and the third lens, the fourth lens, the fifth lens,The focal lengths of the sixth lenses are respectively f3、f4、f5、f6The focal length of the rear group lens satisfies f3、f4、f5、f6And f satisfy the following ratio:
3.5＜f3/f＜4,-0.5＜f4/f5＜-0.45，3＜f6/f＜5。
7. the 2.8mm wide-angle optical system of claim 1, wherein: the first lens satisfies the relation: n is a radical ofd≥1.6，VdNot less than 50; the second lens satisfies the relation: n is a radical ofd≥1.9，VdLess than or equal to 20; the third lens satisfies the relation: n is a radical ofd≥1.7，VdLess than or equal to 50; the fourth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 65; the fifth lens satisfies the relation: n is a radical ofd≥1.9，VdLess than or equal to 20; the sixth lens satisfies the relation: n is a radical ofd≥1.8，VdLess than or equal to 45; wherein N isdIs refractive index, VdAbbe constant.
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| CN201922318693.XU CN211454081U (en) | 2019-12-23 | 2019-12-23 | 2.8mm wide-angle optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110955031A (en) * | 2019-12-23 | 2020-04-03 | 福建福光天瞳光学有限公司 | 2.8mm wide-angle optical system and imaging method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110955031A (en) * | 2019-12-23 | 2020-04-03 | 福建福光天瞳光学有限公司 | 2.8mm wide-angle optical system and imaging method thereof |
| CN110955031B (en) * | 2019-12-23 | 2023-11-10 | 福建福光天瞳光学有限公司 | 2.8mm wide-angle optical system and imaging method thereof |
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