CN210376839U - Small-sized vehicle-mounted optical system - Google Patents
Small-sized vehicle-mounted optical system Download PDFInfo
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- CN210376839U CN210376839U CN201921156804.5U CN201921156804U CN210376839U CN 210376839 U CN210376839 U CN 210376839U CN 201921156804 U CN201921156804 U CN 201921156804U CN 210376839 U CN210376839 U CN 210376839U
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Abstract
The utility model relates to a small-sized vehicle-mounted optical system.A first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens are sequentially arranged in the optical system of a lens along the incident direction of light from left to right; the first lens is a double-concave negative lens, the second lens is a meniscus positive lens, and the first lens and the second lens form a front group lens with negative focal power; the third lens is a biconcave negative lens, the fourth lens is a biconvex positive lens, the third lens and the fourth lens are tightly connected to form a lens glue combination, the fifth lens is a biconvex positive lens, the sixth lens is a meniscus negative lens, the fifth lens and the sixth lens are tightly connected to form a lens glue combination, and the two groups of lens glue combination form a rear group lens with positive focal power. The structure is reasonable in design, and has the advantages of large light flux, high image quality and the like; the temperature compensation function is realized, and the clear image formation of the picture can be kept within the temperature range of-40 ℃ to 85 ℃; meanwhile, the device has day and night confocal function, and has excellent imaging quality in visible light wave band and near infrared wave band.
Description
Technical Field
The utility model relates to a small-size on-vehicle optical system.
Background
In the vehicle-mounted lens, the in-vehicle monitoring lens is widely applied. With the development of the intelligent automobile industry, the in-automobile monitoring system is required to provide functions of face monitoring, face recognition, gesture recognition and the like for the automobile, and the corresponding requirements on the vehicle-mounted monitoring lens are higher and higher. The in-vehicle monitoring lens mainly faces the following problems:
1. the in-vehicle light line environment has large difference in the morning and evening, good imaging in a visible light wave band is required in the daytime, and the imaging quality of the optical system to a near infrared wave band needs to be considered in the night time, so that the in-vehicle monitoring needs to provide a day and night confocal function;
the design difficulty of day and night confocal lens schemes is high, and many small lens schemes for in-vehicle monitoring on the market have no day and night confocal performance.
2. At present, aspheric plastic lenses are generally adopted in small-sized lens schemes for in-vehicle monitoring on the market, the expansion coefficient of the plastic lenses is large, and high temperature is easy to deform, so that high-temperature image blurring can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at above weak point, provide a simple structure's small-size on-vehicle optical system.
The technical scheme of the utility model is that, a small vehicle-mounted optical system, a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens are arranged in the optical system of the lens along the incident direction of light from left to right in sequence;
the first lens is a biconcave negative lens, the second lens is a meniscus positive lens, and the first lens and the second lens form a front group lens with negative focal power;
the third lens is a biconcave negative lens, the fourth lens is a biconvex positive lens, the third lens and the fourth lens are tightly connected to form a lens glue combination, the fifth lens is a biconvex positive lens, the sixth lens is a meniscus negative lens, the fifth lens and the sixth lens are tightly connected to form a lens glue combination, and the two groups of lens glue combinations form a rear group lens with positive focal power.
Further, the concave surfaces of the second lens and the sixth lens face the diaphragm.
Further, the air space between the first lens and the second lens is 1.9mm, the air space between the diaphragm and the third lens is 1.0mm, the air space between the fourth lens and the fifth lens is 0.1mm, and the air space between the front group lens and the rear group lens is 1.0 mm.
Further, a focal length of an optical system formed by the front group lens and the rear group lens is f, and focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f1、f2、f3、f4、f5、f6Wherein f is1、f2And f satisfy the following ratio: -8.5 < f1/f＜-7.5，1.5＜f2/f＜2.5。
Further, the focal lengths of the two groups of lens gluing groups respectively meet the conditions: -2.5 < f3/f4＜-1.5，0.01＜f5/f6＜0.02。
Further, the first lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 60; the second lens satisfies the relation: n is a radical ofd≥1.8，VdLess than or equal to 45; the third lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 45; the fourth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 55; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 60; the sixth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 35; wherein N isdIs refractive index, VdAbbe constant.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the aperture of the light transmission is large, the light entering amount is sufficient at night, the edge imaging quality is ensured, and the device is suitable for the environment with insufficient optics in the vehicle.
2. Compared with an aspheric plastic lens, the all-glass design is adopted, so that the high-low temperature characteristic of the optical system is better, and the image performance is clearer and more stable in the high-low temperature environment of minus 40-85 ℃.
3. Two groups of lens cementing groups are adopted, and by matching of glass with ultrahigh dispersion and low dispersion, near-infrared band chromatic aberration is effectively reduced, and good day and night confocal is realized.
4. The system has reasonable design, good process and low cost.
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 the 850nm MTF of an embodiment of the invention;
FIG. 4 is a graph of defocus at-40 ℃ in the embodiment of the present invention;
fig. 5 is a graph of defocus at high temperature +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 5, in an optical system of the lens, a first lens 1, a second lens 2, a diaphragm 7, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6 are sequentially disposed along a direction of incidence of light from left to right;
the first lens is a biconcave negative lens, the second lens is a meniscus positive lens, and the first lens and the second lens form a front group lens with negative focal power;
the third lens is a biconcave negative lens, the fourth lens is a biconvex positive lens, the third lens and the fourth lens are tightly connected to form a lens glue combination, the fifth lens is a biconvex positive lens, the sixth lens is a meniscus negative lens, the fifth lens and the sixth lens are tightly connected to form a lens glue combination, and the two groups of lens glue combinations form a rear group lens with positive focal power.
In this embodiment, the concave surfaces of the second lens and the sixth lens face the diaphragm.
In this embodiment, an air space between the first lens and the second lens is 1.9mm, an air space between the diaphragm and the third lens is 1.0mm, an air space between the fourth lens and the fifth lens is 0.1mm, and an air space between the front group lens and the rear group lens is 1.0 mm.
In this embodiment, a focal length of an optical system formed by the front group lens and the rear group lens is f, and focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f1、f2、f3、f4、f5、f6Wherein f is1、f2And f satisfy the following ratio: -8.5 < f1/f＜-7.5，1.5＜f2/f＜2.5。
In this embodiment, the focal lengths of the two lens glue groups respectively satisfy the following conditions: -2.5 < f3/f4＜-1.5，0.01＜f5/f6< 0.02, through right the utility model discloses the focal power of the optical system who forms carries out rational distribution according to above proportion, and each lens is for system's focal length f certain proportion, makes the utility model discloses the optical system who forms obtains reasonable correction and balance at 420 ~ 700 nm's wavelength range's aberration.
In this embodiment, the first lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 60; the second lens satisfies the relation: n is a radical ofd≥1.8，VdLess than or equal to 45; the third lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 45; the fourth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 55; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 60; the sixth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 35; wherein N isdIs refractive index, VdAbbe constant.
In this embodiment, a diaphragm C is disposed between the second lens and the third lens, and the air space between the second lens and the diaphragm C is 0.0001 mm; and the rear side of the sixth lens is provided with an optical filter 8.
An imaging method of a small vehicle-mounted 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 and then are imaged; the optical lens adopts a reverse long-distance structure, when the lens starts to work, a first lens in a front group of lenses adopts a double-concave negative lens made of a medium refractive index material, light rays with a large visual angle can be collected, a small incident angle of the light rays is ensured, imaging distortion is reduced, a second lens is made of a high refractive index material, and the first lens and the second lens are matched to effectively reduce the image field curvature of a system; the rear group lens adopts high-refractive-index and ultra-low-dispersion glass and medium-refractive-index and high-dispersion glass which are tightly connected to form a lens gluing group, so that the near-infrared chromatic aberration of an optical system can be reduced, good day and night dual-purpose performance can be realized, and meanwhile, the rear group lens glass has a negative refractive index temperature coefficient and can effectively compensate the high and low temperature focal plane drift of the system.
In the present embodiment, the optical system constituted by the lens group achieves the following optical indexes:
(1) focal length: EFFL 5.00 mm; (2) the diaphragm F is 1.9; (3) the field angle: 2w is more than or equal to 80 degrees; (4) optical distortion: less than-20.5 percent; (5) the diameter of the imaging circle is larger than phi 6; (6) the working wave band is as follows: 420-650 &850 +/-10 nm; (7) the total optical length TTL is less than or equal to 19.8mm, and the optical back intercept BFL is more than or equal to 5.4 mm; (8) the lens is suitable for a megapixel CCD or CMOS camera.
In this example, the parameters for each lens are shown in the following table:
in this embodiment, as can be seen from fig. 2, the MTF of the optical system in the visible light band is good, the MTF value is greater than 0.6 at the spatial frequency of 60pl/mm, and the MTF value is greater than 0.35 at the spatial frequency of 120pl/mm, so that the requirement of two million high definition resolution can be achieved. As can be seen from FIG. 3, the MTF of the optical system in the near infrared band is well represented, and at the spatial frequency of 120pl/mm, the MTF value is greater than 0.3, and the system has good day and night confocal performance.
FIGS. 4 and 5 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-7 μm at-40 ℃ and 8 μm at 85 ℃. The defocusing amount is within an acceptable range, and the image quality performance 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 (6)
1. A small-sized vehicle-mounted optical system is characterized in that: a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens are sequentially arranged in an optical system of the lens along the incident direction of light rays from left to right;
the first lens is a biconcave negative lens, the second lens is a meniscus positive lens, and the first lens and the second lens form a front group lens with negative focal power;
the third lens is a biconcave negative lens, the fourth lens is a biconvex positive lens, the third lens and the fourth lens are tightly connected to form a lens glue combination, the fifth lens is a biconvex positive lens, the sixth lens is a meniscus negative lens, the fifth lens and the sixth lens are tightly connected to form a lens glue combination, and the two groups of lens glue combinations form a rear group lens with positive focal power.
2. The compact vehicular optical system according to claim 1, characterized in that: the concave surfaces of the second lens and the sixth lens face the diaphragm.
3. The compact vehicular optical system according to claim 1, characterized in that: the air interval between the first lens and the second lens is 1.9mm, the air interval between the diaphragm and the third lens is 1.0mm, the air interval between the fourth lens and the fifth lens is 0.1mm, and the air interval between the front group of lenses and the rear group of lenses is 1.0 mm.
4. The compact vehicular optical system according to claim 1, characterized in that: the focal length of an optical system formed by the front group lens and the rear group lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f1、f2、f3、f4、f5、f6Wherein f is1、f2And f satisfy the following ratio: -8.5 < f1/f＜-7.5，1.5＜f2/f＜2.5。
5. The compact vehicular optical system according to claim 1, characterized in that: the focal lengths of the two groups of lens cementing groups respectively meet the conditions: -2.5 < f3/f4＜-1.5，0.01＜f5/f6＜0.02。
6. The compact vehicular optical system according to claim 1, characterized in that: the first lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 60; the second lens satisfies the relation: n is a radical ofd≥1.8，VdLess than or equal to 45; the third lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 45; the fourth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 55; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 60; the sixth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 35; wherein N isdIs refractive index, VdAbbe constant.
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| CN201921156804.5U CN210376839U (en) | 2019-07-23 | 2019-07-23 | Small-sized vehicle-mounted optical system |
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| CN201921156804.5U CN210376839U (en) | 2019-07-23 | 2019-07-23 | Small-sized vehicle-mounted optical system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333592A (en) * | 2019-07-23 | 2019-10-15 | 福建福光天瞳光学有限公司 | A kind of small size optical system and its imaging method |
| CN112612113A (en) * | 2020-12-29 | 2021-04-06 | 福建福光天瞳光学有限公司 | 3.9mm large-aperture day and night confocal lens and imaging method thereof |
| CN118131440A (en) * | 2024-01-30 | 2024-06-04 | 武昌理工学院 | Projection lens and HUD equipment |
-
2019
- 2019-07-23 CN CN201921156804.5U patent/CN210376839U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333592A (en) * | 2019-07-23 | 2019-10-15 | 福建福光天瞳光学有限公司 | A kind of small size optical system and its imaging method |
| CN110333592B (en) * | 2019-07-23 | 2023-12-08 | 福建福光天瞳光学有限公司 | Small-sized vehicle-mounted optical system and imaging method thereof |
| CN112612113A (en) * | 2020-12-29 | 2021-04-06 | 福建福光天瞳光学有限公司 | 3.9mm large-aperture day and night confocal lens and imaging method thereof |
| CN112612113B (en) * | 2020-12-29 | 2023-09-19 | 福建福光天瞳光学有限公司 | Day and night confocal lens with large aperture of 3.9mm and imaging method thereof |
| CN118131440A (en) * | 2024-01-30 | 2024-06-04 | 武昌理工学院 | Projection lens and HUD equipment |
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