CN210376838U - 2.8mm high-definition super wide-angle lens - Google Patents
2.8mm high-definition super wide-angle lens Download PDFInfo
- Publication number
- CN210376838U CN210376838U CN201921153177.XU CN201921153177U CN210376838U CN 210376838 U CN210376838 U CN 210376838U CN 201921153177 U CN201921153177 U CN 201921153177U CN 210376838 U CN210376838 U CN 210376838U
- Authority
- CN
- China
- Prior art keywords
- lens
- satisfies
- angle
- radical
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model provides a 2.8mm high definition super wide-angle lens, include along light incident direction from first lens, second lens, third lens, diaphragm, fourth lens, fifth lens and the sixth lens that sets gradually backward forward, first lens, second lens and third lens constitute focal power and be the preceding camera lens of group of burden, and fourth lens and veneer group constitute focal power and be positive back camera lens of group, and the air interval between first lens and the second lens is 1.5mm, and the air interval between second lens and the third lens is 0.3mm, the air interval between third lens and the fourth lens is 0.4mm, and the air interval between fourth lens and the fifth lens is 0.1 mm. The utility model discloses a reasonable optical design has realized that the formation of image quality is good under the large aperture, has 120 great horizontal field of view scope, high definition image quality, and has the function of high low temperature compensation, also can keep the formation of image clear under the environment of-40 ℃ - +85 ℃.
Description
Technical Field
The utility model relates to a 2.8mm high definition super wide-angle lens.
Background
Wide angle fixed focus lenses are widely used in vehicle systems to provide large field of view scene monitoring for automobiles. Wide-angle fixed-focus lenses on the market are various, and 2.8mm lenses can provide a larger angle of view, so that the wide-angle fixed-focus lenses are widely applied. The traditional 2.8mm wide-angle lens mainly faces the following technical problems: firstly, for an ultra-wide-angle lens, because the field angle is very large, the edge aberration correction difficulty is high, and the image quality is difficult to ensure; secondly, the lens aperture is not large enough, which directly causes obvious image noise at night and poor night imaging effect; thirdly, the working environment of the vehicle-mounted monitoring lens is complex, and the focal length of the lens after imaging is changed in the high-temperature and low-temperature environment due to the influence of the glass refractive index and the mechanical structure of the lens on temperature, so that the imaging quality of the lens is required to be ensured within the range of minus 40 ℃ to plus 85 ℃.
SUMMERY OF THE UTILITY MODEL
The utility model discloses improve above-mentioned problem, promptly the to-be-solved technical problem of the utility model is to provide a 2.8mm high definition super wide angle camera lens, provide high definition image quality under the camera lens has big angle of view condition to can keep the picture clear at-40 ℃ - +85 ℃ temperature range, applicable in occasions such as on-vehicle driving control, the control of backing a car.
The utility model discloses a concrete implementation scheme is: the utility model provides a 2.8mm high definition super wide-angle lens, includes along the light incident direction from preceding first lens, second lens, third lens, diaphragm, fourth lens, fifth lens and the sixth lens that back interval set gradually along the forward, first lens, second lens and third lens constitute the front group camera lens that focal power is negative, and fifth lens that has positive focal power and sixth lens that has negative focal power are sealed to form the cementing group, fourth lens and cementing group constitute the back group camera lens that focal power is positive, the air interval between first lens and the second lens is 1.5mm, the air interval between second lens and the third lens is 0.3mm, the air interval between third lens and the fourth lens is 0.4mm, the air interval between fourth lens and the fifth lens is 0.1 mm.
Further, the first lens and the second lens are both meniscus negative lenses, and the third lens and the fourth lens are both double convex positive lenses.
Furthermore, the diaphragm is provided with a diaphragm hole, and concave surfaces of the first lens, the second lens, the fourth lens and the sixth lens face the diaphragm hole.
Further, the focal length of the optical system composed of the front group lens and the rear group lens is set as f, and the focal lengths of the first lens, the second lens, the third lens and the fourth lens are respectively set as f in sequence1、f2、f3、f4The proportion of the components satisfies: -1.8 < f1/f＜-1.2，-3.8＜f2/f＜-3，1.5＜f3/f＜2，2.5＜f4/f＜3。
Further, the focal lengths of the fifth lens and the sixth lens are respectively set to f5、f6The proportion of the components satisfies: -1 < f5/f6＜-0.2。
Further, the first lens satisfies the relation: n is a radical ofd≧1.5，Vd≧50；
The second lens satisfies the relation: n is a radical ofd≧1.2，Vd≧60；
The third lens satisfies the relation: n is a radical ofd≧1.6，Vd≦45；
The fourth lens satisfies the relation: n is a radical ofd≧1.6，Vd≧40；
The fifth lens satisfies the relation: n is a radical ofd≦1.7，Vd≧55；
The sixth lens satisfies the relation: n is a radical ofd≧1.8，Vd≦25；
Wherein N isdIs refractive index, VdAbbe constant.
Further, a filter is arranged on the rear side of the sixth lens.
Compared with the prior art, the utility model discloses following beneficial effect has: the device has the advantages of compact structure, reasonable design, short total optical path length of the whole lens, small lens volume, moderate back focus, large aperture of diaphragm light, sufficient light input quantity at night, complete applicability to night and dark light conditions, temperature compensation function, constant optimal resolution imaging position of the lens within the temperature range of minus 40 ℃ to plus 85 ℃, realization of providing high-definition image quality under the condition of large field angle, clear picture maintenance within the temperature range of minus 40 ℃ to plus 85 ℃, applicability to vehicle-mounted driving monitoring, backing monitoring and other occasions, excellent cost performance and very high market value.
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 the MTF defocus curve at high temperature +85 ℃.
In the figure: 1-a first lens, 2-a second lens, 3-a third lens, 4-a fourth lens, 5-a fifth lens, 6-a sixth lens, 7-a diaphragm and 8-a filter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 1, in the present embodiment, a 2.8mm high-definition super-wide-angle lens is provided, which includes a first lens 1, a second lens 2, a third lens 3, a diaphragm 7, a fourth lens 4, a fifth lens 5, and a sixth lens 6 that are sequentially disposed from front to back along a light incident direction, the first lens 1, the second lens 2 and the third lens 3 form a front group lens with negative focal power, a fifth lens 5 with positive focal power and a sixth lens 6 with negative focal power are tightly connected to form a gluing group, the fourth lens 4 and the cementing group form a rear group lens with positive focal power, the air space between the first lens and the second lens is 1.5mm, the air space between the second lens and the third lens is 0.3mm, the air space between the third lens and the fourth lens is 0.4mm, and the air space between the fourth lens and the fifth lens is 0.1 mm.
In this embodiment, the first lens element 1 and the second lens element 2 are both meniscus negative lens elements, and the third lens element 3 and the fourth lens element 4 are both double convex positive lens elements.
In this embodiment, the diaphragm 7 has a diaphragm hole, and the concave surfaces of the first lens, the second lens, the fourth lens and the sixth lens face the diaphragm hole; the aperture is large in light-passing aperture, the light-entering quantity at night is sufficient, the device is completely suitable for night and dim light conditions, and the temperature compensation function is achieved.
In this embodiment, the focal length of the optical system composed of the front group lens and the rear group lens is set to f, and the focal lengths of the first lens, the second lens, the third lens and the fourth lens are sequentially set to f1、f2、f3、f4The proportion of the components satisfies: -1.8 < f1/f＜-1.2，-3.8＜f2/f＜-3，1.5＜f3/f＜2，2.5＜f4/f＜3。
In this embodiment, the focal lengths of the fifth lens element and the sixth lens element are respectively set to f5、f6The proportion of the components satisfies: -1 < f5/f6＜-0.2。
Through carrying out rational distribution according to above proportion to the focal power of the optical system that this device formed, first lens, second lens, third lens and fourth lens are for system's focus f certain proportion, and fifth lens and sixth lens are certain proportion, make 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 following relation: n is a radical ofd≧1.5，Vd≧50；
The second lens satisfies the relation: n is a radical ofd≧1.2，Vd≧60；
The third lens satisfies the relation: n is a radical ofd≧1.6，Vd≦45；
The fourth lens satisfies the relation: n is a radical ofd≧1.6，Vd≧40；
The fifth lens satisfies the relation: n is a radical ofd≦1.7，Vd≧55；
The sixth lens satisfies the relation: n is a radical ofd≧1.8，Vd≦25；
Wherein N isdIs refractive index, VdAbbe constant.
In this embodiment, a filter 8 is disposed on the rear side of the sixth lens.
In this embodiment, light rays enter from front to back in sequence and pass through the first lens 1, the second lens 2, the third lens 3, the diaphragm 7, the fourth lens 4, the fifth lens 5, and the sixth lens 6 in sequence to form an image.
In the working process, the front group of lenses with negative focal power can greatly improve the field range of the integral optical system; the second lens is made of crown glass with low refractive index and low dispersion, the third lens is made of flint glass with high refractive index and high dispersion, and the combination of the second lens and the third lens is favorable for reducing the curvature of the image plane and the chromatic aberration of magnification of the system; the fifth lens in the cemented set is made of medium refractive index ultra-low dispersion crown glass, the sixth lens in the cemented set is made of high refractive index ultra-high dispersion flint glass, and the cemented surface is bent towards the diaphragm;
when light passes through the gluing set, the gluing set can correct system chromatic aberration and high-grade off-axis spherical aberration; meanwhile, the fifth lens in the gluing set has a negative temperature coefficient of refractive index, and the overall temperature coefficient of positive refractive index of the system can be compensated, so that the temperature compensation of minus 40 ℃ to plus 85 ℃ is realized.
Example 2: in addition to embodiment 1, in this embodiment, a lens parameter table (curvature radius) is composed of a first lens 1, a second lens 2, a third lens 3, an aperture stop 7, a fourth lens 4, a fifth lens 5, and a sixth lens 6RThickness of the filmdAnd refractive index Nd) As shown in the following table:
in the above table, the first to sixth lenses are all double-sided, the front side looking from front to back is the first row parameter in the first lens, the front side looking from back to front is the second row parameter in the first lens, and the parameters of the remaining second, third, fourth, fifth and sixth lens items are analogized in this way.
Example 3: on the basis of embodiment 1, in this embodiment, the optical structure formed by the front group lens and the rear group lens achieves the following optical indexes:
(1) focal length: EFFL =2.85 mm;
(2) aperture F = 2.0;
(3) the field angle: 2w is more than or equal to 150 degrees;
(4) distortion of TV: < -22.8%;
(5) the diameter of the imaging circle is larger than phi 6 mm;
(6) the working wave band is as follows: 420-700 nm;
(7) the total optical length TTL is less than or equal to 16.5mm, and the optical back intercept BFL is more than or equal to 5 mm;
(8) the lens is suitable for a CCD or CMOS camera with 200 ten thousand pixels.
In this embodiment, as shown in FIG. 2, the visible light MTF curve is shown in FIG. 2, the environment is a working band of 420-700 nm at a normal temperature of 20 ℃, and the MTF is at a spatial frequency of 120lp/mmIs greater than 0.3 at 80lp/mmThe resolution ratio is more than 0.5, and the requirement of two million high-definition resolution can be met.
As shown in FIGS. 3 and 4, FIG. 3 and FIG. 4 are the MTF curves of defocus at low temperature of-40 deg.C and high temperature of +85 deg.C, respectively, the front lens group and the rear lens group are disposed in a lens barrel, preferably, the lens barrel can be made of metal, the base is made of PPS, and the spatial frequency is 120lp/mmDefocus amount at low temperature of 3μmHigh temperature defocus amount of-4μmThe 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.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (7)
1. The 2.8mm high-definition super-wide-angle lens is characterized by comprising a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from front to back at intervals along the light incidence direction, wherein the first lens, the second lens and the third lens form a front group lens with negative focal power, the fifth lens with positive focal power and the sixth lens with negative focal power are tightly connected to form a gluing group, the fourth lens and the gluing group form a rear group lens with positive focal power, the air interval between the first lens and the second lens is 1.5mm, the air interval between the second lens and the third lens is 0.3mm, the air interval between the third lens and the fourth lens is 0.4mm, and the air interval between the fourth lens and the fifth lens is 0.1 mm.
2. A 2.8mm high definition super wide angle lens as claimed in claim 1, wherein said first lens and said second lens are both meniscus negative lenses, and said third lens and said fourth lens are both biconvex positive lenses.
3. The 2.8mm high definition super wide-angle lens according to claim 1, wherein the diaphragm has a diaphragm hole, and the concave surfaces of the first lens, the second lens, the fourth lens and the sixth lens face the diaphragm hole.
4. A2.8 mm high definition super wide-angle lens according to any one of claims 1 to 3, wherein the focal length of the optical system composed of the front group lens and the rear group lens is set as f, and the focal lengths of the first lens, the second lens, the third lens and the fourth lens are respectively set as f in turn1、f2、f3、f4Which isThe proportion satisfies: -1.8 < f1/f＜-1.2，-3.8＜f2/f＜-3，1.5＜f3/f＜2，2.5＜f4/f＜3。
5. A2.8 mm high definition super wide-angle lens according to any one of claims 1 to 3, wherein the focal lengths of the fifth lens element and the sixth lens element are set to f5、f6The proportion of the components satisfies: -1 < f5/f6＜-0.2。
6. A2.8 mm high definition super wide-angle lens according to any one of claims 1 to 3, wherein the first lens satisfies the relation: n is a radical ofd≧1.5，Vd≧50；
The second lens satisfies the relation: n is a radical ofd≧1.2，Vd≧60；
The third lens satisfies the relation: n is a radical ofd≧1.6，Vd≦45；
The fourth lens satisfies the relation: n is a radical ofd≧1.6，Vd≧40；
The fifth lens satisfies the relation: n is a radical ofd≦1.7，Vd≧55；
The sixth lens satisfies the relation: n is a radical ofd≧1.8，Vd≦25；
Wherein N isdIs refractive index, VdAbbe constant.
7. A2.8 mm high-definition super-wide-angle lens according to any one of claims 1 to 3, wherein a filter is arranged on the rear side of the sixth lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921153177.XU CN210376838U (en) | 2019-07-22 | 2019-07-22 | 2.8mm high-definition super wide-angle lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921153177.XU CN210376838U (en) | 2019-07-22 | 2019-07-22 | 2.8mm high-definition super wide-angle lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210376838U true CN210376838U (en) | 2020-04-21 |
Family
ID=70273745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921153177.XU Active CN210376838U (en) | 2019-07-22 | 2019-07-22 | 2.8mm high-definition super wide-angle lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210376838U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346915A (en) * | 2019-07-22 | 2019-10-18 | 福建福光天瞳光学有限公司 | A kind of 2.8mm high definition bugeye lens and its working method |
| CN114859527A (en) * | 2022-06-08 | 2022-08-05 | 湖南博明英光学科技有限公司 | Ultra-wide angle optical system |
-
2019
- 2019-07-22 CN CN201921153177.XU patent/CN210376838U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346915A (en) * | 2019-07-22 | 2019-10-18 | 福建福光天瞳光学有限公司 | A kind of 2.8mm high definition bugeye lens and its working method |
| CN110346915B (en) * | 2019-07-22 | 2023-07-21 | 福建福光天瞳光学有限公司 | 2.8mm high-definition ultra-wide angle lens and working method thereof |
| CN114859527A (en) * | 2022-06-08 | 2022-08-05 | 湖南博明英光学科技有限公司 | Ultra-wide angle optical system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105988188B (en) | Conversion lens device and camera system with the conversion lens device | |
| WO2021129577A1 (en) | Optical imaging lens and imaging device | |
| CN110646919B (en) | Fisheye lens | |
| WO2022247827A1 (en) | Ultra wide angle lens and imaging device | |
| CN110568590A (en) | Starlight-level optical lens and imaging method thereof | |
| CN210376838U (en) | 2.8mm high-definition super wide-angle lens | |
| CN112285884B (en) | 1.14mm ultra-wide angle optical system and imaging method thereof | |
| CN112882209B (en) | Wide-angle lens and imaging apparatus | |
| KR100859103B1 (en) | Optical system for module type wide angle camera | |
| CN210376850U (en) | Day and night dual-purpose vehicle-mounted optical system | |
| CN210742599U (en) | Starlight-level optical lens | |
| CN210376840U (en) | Low-distortion rearview optical system | |
| CN109975950A (en) | Optical lens | |
| CN110346921A (en) | A kind of vehicle-mounted optical system of day and night and its imaging method | |
| CN110806633A (en) | 1.4mm wide-angle optical system and imaging method thereof | |
| CN107436483B (en) | 1.7mm ultra-wide-angle rear-view vehicle-mounted lens | |
| CN110488471A (en) | Optical lens | |
| CN110346915B (en) | 2.8mm high-definition ultra-wide angle lens and working method thereof | |
| CN210514762U (en) | Novel rearview optical system | |
| CN211454081U (en) | 2.8mm wide-angle optical system | |
| CN112285883B (en) | Ultra-wide angle optical system and imaging method thereof | |
| CN210742598U (en) | Long-focus vehicle-mounted optical lens | |
| CN210742594U (en) | Rear-view optical system | |
| CN110412744B (en) | Novel rearview optical system and manufacturing method thereof | |
| CN113589480A (en) | High-cost performance glass-plastic mixed fisheye lens capable of resisting high and low temperatures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |