CN209167643U - A kind of low chief ray incidence angles ultra-wide angle optical system - Google Patents
A kind of low chief ray incidence angles ultra-wide angle optical system Download PDFInfo
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- CN209167643U CN209167643U CN201821972245.0U CN201821972245U CN209167643U CN 209167643 U CN209167643 U CN 209167643U CN 201821972245 U CN201821972245 U CN 201821972245U CN 209167643 U CN209167643 U CN 209167643U
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- bent moon
- biconvex positive
- optical system
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Abstract
The utility model provides a kind of low chief ray incidence angles ultra-wide angle optical system, including lens barrel and the optical system being set in lens barrel, the optical system includes being incident on imaging surface direction by light to be disposed with bent moon negative lens L1, bent moon negative lens L2, biconvex positive lens L3, aperture diaphragm S1, bent moon positive lens L4, the cemented doublet and biconvex positive lens L7 that biconvex positive lens L5 and bent moon negative lens L6 is constituted, parallel flat P1 is provided between the image planes and biconvex positive lens L7, this optical lens system has very big field angle, large-scale scenery can be shot, relative illumination is higher, especially in very big field angle, chief ray incidence angles are low, current video monitoring imager chip is adapted to very well, the camera lens can allow the CCD of 5,000,000 pixels or CMOS chip uses.
Description
Technical field
The utility model relates to a kind of low chief ray incidence angles ultra-wide angle optical systems.
Background technique
Camera lens is that video monitoring system indispensable " eyes " divides camera lens with the development of imager chip technology
Resolution requirement is higher and higher, requires the matching degree of camera lens and imager chip also higher and higher.Wide-angle monitoring mirror currently on the market
Head still has that relative illumination is relatively low, chief ray incidence angles are bigger than normal to match very well with imager chip, so that monitoring camera is matched
When closing monitor camera, effect and the central vision of peripheral field differ greatly, especially in imager chip high resolution
It becomes apparent.This kind of camera lens cooperation video camera in use, be difficult really realizes high-resolution and day and night confocal.
Utility model content
The utility model improves the above problem, i.e., the technical problems to be solved in the utility model is existing video
Monitor the problems such as wide-angle lens relative illumination is low, chief ray incidence angles are big, it is proposed that a relative illumination height, chief ray incidence angles
Small, high resolution, be capable of good match imager chip CRA video monitoring camera lens.
The specific embodiment of the utility model is: a kind of low chief ray incidence angles ultra-wide angle optical system, including lens barrel
And it is set to the optical system in lens barrel, the optical system includes being incident on imaging surface direction by light to be disposed with bent moon
Negative lens L1, bent moon negative lens L2, biconvex positive lens L3, aperture diaphragm S1, bent moon positive lens L4, biconvex positive lens L5 and bent moon
The cemented doublet and biconvex positive lens L7 that negative lens L6 is constituted, are provided with parallel flat between the image planes and biconvex positive lens L7
P1。
Further, the airspace between the bent moon negative lens L1 and bent moon negative lens L2 is 2.7mm；Bent moon is negative saturating
The airspace of mirror L2 and biconvex positive lens L3 is 1.9mm；Biconvex positive lens L3 and the airspace of bent moon positive lens L4 are
1.2mm；The airspace of bent moon positive lens L4 and biconvex positive lens L5 in cemented doublet is 0.1mm；Bent moon is negative saturating in glued part
The airspace of mirror L6 and biconvex positive lens L7 is 0.1mm.
Further, the industrial lens focal length is f；Bent moon negative lens L1 and the combined focal length of bent moon negative lens L2 are
fa；The focal length of biconvex positive lens L7 is f7；It is double by biconvex positive lens L5, bent moon negative lens the L6 cemented doublet constituted and the 7th
The focal length of convex positive lens L7 combination is fb；Meet following relationship: -2 < fa/f < -0.5；3<f7/f<6；2<fb/f<4.5.
Further, the glass material Abbe number of the biconvex positive lens L5 and biconvex positive lens L7 is respectively v5 and v7,
Meet following relationship: 55 < v5 < 95,55 < v7 < 95.
The utility model further includes a kind of low chief ray incidence angles ultra-wide angle optical system works method, using as described above
A kind of low chief ray incidence angles ultra-wide angle optical system, the bent moon negative lens L1, bent moon negative lens L2 focal power are negative
Eyeglass has compressed the incidence angle of light, so that subsequent eyeglass undertakes lesser field angle to balance aberration, biconvex positive lens L3
It is positive with the focal power of bent moon positive lens L4, mainly undertakes aberration on the main axis such as spherical aberration corrector；Biconvex positive lens L5 and bent moon
The negative lens L6 cemented doublet that is positive of combination focal power and biconvex positive lens L7 focal power are positive eyeglass, mainly correct on axis
Color difference and chromatic longitudiinal aberration, and be assigned with this 3 eyeglasses and carry out compression chief ray incidence angles, make the monitoring optical lens in visual field
Still there are the chief ray incidence angles of very little in the very big situation in angle；Pass through the control to vignetting and adjust ray height, improves camera lens
Relative illumination.
Compared with prior art, the utility model has the following beneficial effects: being provided with lesser vignetting and compressing key light
Line angle degree keeps relative illumination height, chief ray incidence angles small, and the more preferable CRA for matching imager chip shoots and carrys out illuminance of image plane more
Uniformly, the border color distortion factor is very low, and the imaging effect of peripheral field is close to central vision；By reasonable distribution focal power with
And color difference control, the color difference of camera lens is balanced, the color difference of purple light is preferably controlled, so that camera lens is very slight in purple boundary phenomenon；
It reasonably selects and arranges in pairs or groups by material, the more preferable advanced amount of spherical aberration corrector further improves central vision and peripheral field
MTF improves the image quality within the scope of full filed；By improving the refractive index of some materials, increase the song of the big eyeglass of focal power
Rate radius reduces the susceptibility of optical mirror slip, so that the yield of optical lens batch production is higher, which be can allow
The CCD or CMOS chip of 5000000 pixels are used.
Detailed description of the invention
Fig. 1 is the utility model optical texture schematic diagram.
Fig. 2 is the utility model optical lens mtf value.
Fig. 3 is the relative illumination of the utility model optical lens.
Fig. 4 is the chief ray incidence angles of this optical lens.
Specific embodiment
The utility model is described in more detail with reference to the accompanying drawings and detailed description.
As shown in figures 1-4, a kind of low chief ray incidence angles ultra-wide angle optical system, including lens barrel and be set in lens barrel
Optical system, the optical system includes being incident on imaging surface direction by light to be disposed with bent moon negative lens L1, bent moon
Negative lens L2, biconvex positive lens L3, aperture diaphragm S1, bent moon positive lens L4, biconvex positive lens L5 and bent moon negative lens L6 are constituted
Cemented doublet and biconvex positive lens L7, parallel flat P1 is provided between the image planes and biconvex positive lens L7.
In the present embodiment, the airspace between the bent moon negative lens L1 and bent moon negative lens L2 is 2.7mm；Bent moon is negative
The airspace of lens L2 and biconvex positive lens L3 is 1.9mm；Biconvex positive lens L3 and the airspace of bent moon positive lens L4 are
1.2mm；The airspace of bent moon positive lens L4 and biconvex positive lens L5 in cemented doublet is 0.1mm；Bent moon is negative saturating in glued part
The airspace of mirror L6 and biconvex positive lens L7 is 0.1mm.
In the present embodiment, the industrial lens focal length is f；Bent moon negative lens L1 and the combined focal length of bent moon negative lens L2 are
fa；The focal length of biconvex positive lens L7 is f7；It is double by biconvex positive lens L5, bent moon negative lens the L6 cemented doublet constituted and the 7th
The focal length of convex positive lens L7 combination is fb；Meet following relationship: -2 < fa/f < -0.5；3<f7/f<6；2<fb/f<4.5.
In the present embodiment, the glass material Abbe number of the biconvex positive lens L5 and biconvex positive lens L7 be respectively v5 and
V7 meets following relationship: 55 < v5 < 95,55 < v7 < 95.
Each lens parameter such as lower surface in the present embodiment, L1, L2, L3.. are the title of corresponding lens in following table, each
Lens corresponding S1, S2, S3 ... are the two sides of each lens, such as S1 and S2 is that bent moon negative lens L1 by light is incident on imaging
Two surfaces of face direction successively, the corresponding thickness or spacing with a thickness of with adjacent surface in each surface, such as the corresponding thickness of S1
Degree 1 is S1 and the center S2 spacing is 1mm, additionally, due to the cemented doublet that biconvex positive lens L5, bent moon negative lens L6 are constituted, therefore
S11 is the curved surface value that biconvex positive lens L5, bent moon negative lens L6 match contact, and S14 is corresponding with a thickness of biconvex positive lens L7
To the distance of image planes, S6 is biconvex positive lens L3 and diaphragm spacing, and glass refraction is the refractive index of corresponding lens.
Official system meets following performance parameter in the present embodiment
The specific performance parameter of this optical system are as follows:
(1) focal length: EFFL=2.4mm
(2) number=2.1 F
(3) field angle: 2w >=166 °
(4) imaging circular diameter is greater than Ф 6.6
(5) relative illumination is greater than 59%
(6) chief ray incidence angles are less than 5 °
(7) operating spectral range: 435nm~850nm
(8) optics overall length TTL≤23.9mm, optics rear cut-off distance >=5mm
(9) camera lens is suitable for 5,000,000 pixel high-resolution CCD or cmos camera
The eyeglass that above-mentioned optical system bent moon negative lens L1, bent moon negative lens L2 focal power are negative has compressed the incidence of light
Angle, so that subsequent eyeglass undertakes lesser field angle to balance aberration, the light focus of biconvex positive lens L3 and bent moon positive lens L4
Degree is positive, and mainly undertakes aberration on the main axis such as spherical aberration corrector；Biconvex positive lens L5 and bent moon negative lens L6 combines focal power
Positive cemented doublet and biconvex positive lens L7 focal power is positive eyeglass, mainly corrects color difference and chromatic longitudiinal aberration on axis, and
It is assigned with this 3 eyeglasses and carries out compression chief ray incidence angles, there is the monitoring optical lens still very in the very big situation of field angle
Small chief ray incidence angles；Pass through the control to vignetting and adjust ray height, improves the relative illumination of camera lens.
Above-mentioned any technical solution disclosed in the utility model unless otherwise stated, if it discloses numberical range,
So disclosed numberical range is preferred numberical range, and any it should be appreciated by those skilled in the art preferred numerical value
Range is only the numerical value that technical effect is obvious or representative in many enforceable numerical value.Since numerical value is more,
It is impossible to exhaust, so the utility model discloses component values just to illustrate the technical solution of the utility model, also, above-mentioned
The numerical value enumerated should not constitute the limitation that protection scope is created to the utility model.
Either component provided by the utility model by multiple individual component parts either assembled, or
The separate part that integrally formed technique manufactures.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it
System；Although the utility model has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should
Understand: specific implementation of the utility model can still be modified or is equally replaced to some technical characteristics
It changes；Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model
In range.
Claims (4)
1. a kind of low chief ray incidence angles ultra-wide angle optical system, which is characterized in that including lens barrel and the light being set in lens barrel
System, the optical system include being incident on imaging surface direction by light to be disposed with bent moon negative lens L1, bent moon negative saturating
The glue that mirror L2, biconvex positive lens L3, aperture diaphragm S1, bent moon positive lens L4, biconvex positive lens L5 and bent moon negative lens L6 are constituted
Eyeglass and biconvex positive lens L7 are closed, parallel flat P1 is provided between the image planes and biconvex positive lens L7.
2. a kind of low chief ray incidence angles ultra-wide angle optical system according to claim 1, which is characterized in that the bent moon
Airspace between negative lens L1 and bent moon negative lens L2 is 2.7mm；The air of bent moon negative lens L2 and biconvex positive lens L3
Between be divided into 1.9mm；The airspace of biconvex positive lens L3 and bent moon positive lens L4 is 1.2mm；Bent moon positive lens L4 and glued mirror
The airspace of biconvex positive lens L5 is 0.1mm in piece；In glued part between bent moon negative lens L6 and the air of biconvex positive lens L7
It is divided into 0.1mm.
3. a kind of low chief ray incidence angles ultra-wide angle optical system according to claim 2, which is characterized in that if optical system
The lens focus of system composition is f；The combined focal length of bent moon negative lens L1 and bent moon negative lens L2 is fa；The coke of biconvex positive lens L7
Away from for f7；The focal length combined by the cemented doublet that biconvex positive lens L5, bent moon negative lens L6 are constituted with the 7th biconvex positive lens L7
For fb；Meet following relationship: -2 < fa/f < -0.5；3<f7/f<6；2<fb/f<4.5.
4. a kind of low chief ray incidence angles ultra-wide angle optical system according to claim 3, which is characterized in that the biconvex
The glass material Abbe number of positive lens L5 and biconvex positive lens L7 is respectively v5 and v7, meets following relationship: 55 < v5 < 95, and 55
<v7<95。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821972245.0U CN209167643U (en) | 2018-11-28 | 2018-11-28 | A kind of low chief ray incidence angles ultra-wide angle optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821972245.0U CN209167643U (en) | 2018-11-28 | 2018-11-28 | A kind of low chief ray incidence angles ultra-wide angle optical system |
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| CN209167643U true CN209167643U (en) | 2019-07-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021051277A1 (en) * | 2019-09-17 | 2021-03-25 | 南昌欧菲精密光学制品有限公司 | Optical system, camera module, and automobile |
-
2018
- 2018-11-28 CN CN201821972245.0U patent/CN209167643U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021051277A1 (en) * | 2019-09-17 | 2021-03-25 | 南昌欧菲精密光学制品有限公司 | Optical system, camera module, and automobile |
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