CN208818915U - A kind of 4K fish eye lens - Google Patents
A kind of 4K fish eye lens Download PDFInfo
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- CN208818915U CN208818915U CN201821708045.4U CN201821708045U CN208818915U CN 208818915 U CN208818915 U CN 208818915U CN 201821708045 U CN201821708045 U CN 201821708045U CN 208818915 U CN208818915 U CN 208818915U
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Abstract
The utility model discloses a kind of 4K fish eye lens.The fish eye lens includes: lens barrel, the optical lens being arranged successively from the object side to the image side in the lens barrel are as follows: the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, diaphragm, the 8th lens, the 9th lens, the tenth lens, the 11st lens and optical filter;First lens, second lens, the 8th lens and the tenth lens are the falcate glass lens with negative power, the third lens and the 6th lens are the double concave glass lens with negative power, and the 4th lens, the 5th lens, the 7th lens, the 9th lens and the 11st lens are the lenticular glass lens with positive light coke;First lens, second lens, the 8th lens and the tenth lens convex surface towards object space, concave surface is towards image space.Clarity can be improved using the fish eye lens of the utility model, be suitable for processing.
Description
Technical field
The utility model relates to protection and monitor fields, more particularly to the fish eye lens that a kind of 4K is extremely clear.
Background technique
In recent years, in terms of safety-security area, with the rise of 4K, 8K resolution ratio, requirement of the market to safety monitoring camera lens is
It is higher and higher, pixel is higher, image quality is more preferable, size requirement is short and small, aperture is bigger etc..Wherein, field angle is greater than 180 ° of fish
Glasses head, because the angular range of its observation is big, without dead angle due to be widely used in various overall view monitoring occasions, such as parking lot.
And general fish eye lens its pixel is not able to satisfy the demand of 4K mostly between 200 ten thousand to 500 ten thousand pixels.And it is some can
Meet the extremely clear fish eye lens of 4K or constituent element number is on the high side, sensitivity is partial in terms of concentricity, is unfavorable for producing in batches;It adopts
Difficulty of processing with aspherical lens, eyeglass is larger.
Summary of the invention
The purpose of the utility model is to provide a kind of 4K fish eye lens, clarity can be improved, and be suitable for processing.
To achieve the above object, the utility model provides following scheme:
A kind of 4K fish eye lens, the fish eye lens include: lens barrel, are arranged successively from the object side to the image side in the lens barrel
Optical lens are as follows: the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, light
Door screen, the 8th lens, the 9th lens, the tenth lens, the 11st lens and optical filter;First lens, second lens, institute
It states the 8th lens and the tenth lens is the falcate glass lens with negative power, the third lens and the described 6th
Lens are the double concave glass lens with negative power, the 4th lens, the 5th lens, the 7th lens, institute
It states the 9th lens and the 11st lens is the lenticular glass lens with positive light coke;First lens, described
The convex surface of two lens, the 8th lens and the tenth lens is towards object space, and concave surface is towards image space.
Optionally, the third lens, the 4th lens are glued together;6th lens, the 7th lens are glued at one
It rises;8th lens, the 9th lens are glued together;Tenth lens, the 11st lens are glued together.
Optionally, the optical filter uses cutoff filter or smalt.
Optionally, refractive index nd1 >=1.90 of first lens, Abbe number Vd1≤40;The refraction of second lens
Rate nd2 >=1.80, Abbe number Vd2≤45;Refractive index nd8≤1.65 of 8th lens, Abbe number Vd8 >=55;Described
Refractive index nd10 >=1.75 of ten lens, Abbe number Vd10≤40.
Optionally, refractive index nd3 >=1.80 of the third lens, Abbe number Vd3≤45;The refraction of 6th lens
Rate nd6 >=1.85, Abbe number Vd6≤45.
Optionally, the concave surface of the third lens and the 6th lens is towards object space and image space.
Optionally, refractive index nd4 >=1.70 of the 4th lens, Abbe number Vd4≤30;The refraction of 5th lens
Rate nd5 >=1.80, Abbe number Vd5≤45;Refractive index nd7≤1.65 of 7th lens, Abbe number Vd7≤50;Described
Refractive index nd9≤1.55 of nine lens, Abbe number Vd9 >=65;Refractive index nd11≤1.55 of 11st lens, Abbe number
Vd11≥65。
Optionally, the 4th lens, the 5th lens, the 7th lens, the 9th lens and the described tenth
The convex surface of one lens is towards object space and image space.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects: this is practical new
Type provides a kind of 4K fish eye lens, and the fish eye lens includes: lens barrel, the light being arranged successively from the object side to the image side in the lens barrel
Learn lens are as follows: the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, diaphragm,
8th lens, the 9th lens, the tenth lens, the 11st lens and optical filter;It is first lens, second lens, described
8th lens and the tenth lens are the falcate glass lens with negative power, and the third lens and the described 6th are thoroughly
Mirror is the double concave glass lens with negative power, the 4th lens, the 5th lens, the 7th lens, described
9th lens and the 11st lens are the lenticular glass lens with positive light coke;First lens, described second
The convex surface of lens, the 8th lens and the tenth lens is towards object space, and concave surface is towards image space.Using the fish of the utility model
The eye angle of view can reach 185 °, and imaging circle can reach Φ 5.335mm, and f-number reaches 2.0, it is seen that light resolution ratio reaches
12000000 pixels fully meet the extremely clear requirement of 4K, wide market.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without any creative labor, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the utility model 4K fish eye lens schematic device;
Fig. 2 is the point range figure under the utility model visible light 436-656nm.
Fig. 3 is the MTF curve figure under the utility model visible light 436-656nm.
Fig. 4 is the curvature of field and distortion figure under the utility model visible light 436-656nm.
Fig. 5 is the relative illumination curve graph under the utility model visible light 436-656nm.
Fig. 6 is the defocus MTF curve figure under the utility model visible light 436-656nm.
Fig. 7 is the ratio chromatism, curve graph under the utility model visible light 436-656nm.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
Fig. 1 is the utility model 4K fish eye lens schematic device.As shown in Figure 1, a kind of 4K fish eye lens, the flake
Camera lens includes: lens barrel, the optical lens being arranged successively from the object side to the image side in the lens barrel are as follows: the first lens 1, the second lens 2,
The third lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7, diaphragm 8, the 8th lens 9, the 9th lens 10,
Tenth lens 11, the 11st lens 12 and optical filter 13;First lens 1, second lens 2,9 and of the 8th lens
Tenth lens 11 are the falcate glass lens with negative power, and the third lens 3 and the 6th lens 6 are tool
There are the double concave glass lens of negative power, the 4th lens 4, the 5th lens 5, the 7th lens 7, the described 9th
Lens 10 and the 11st lens 12 are the lenticular glass lens with positive light coke;First lens 1, described second
The convex surface of lens 2, the 8th lens 9 and the tenth lens 11 is towards object space, and concave surface is towards image space.
The third lens 3, the 4th lens 4 are glued together, form the balsaming lens of negative power, cemented surface plating is anti-reflection
Film.6th lens 6, the 7th lens 7 are glued together, form the balsaming lens of negative power.8th lens 9,
Nine lens 10 are glued together, form the balsaming lens of positive light coke.Tenth lens, the 11st lens are glued together,
Form the balsaming lens of positive light coke.The refractive index nd10 of the tenth lens 11 and refractive index nd11 of the 11st lens 12,
Difference range between the two is-nd11 >=0.25 nd10, the Abbe number Vd10 and the 11st lens 12 of the tenth lens 11
Abbe number Vd11, difference range between the two is-Vd10 >=30 Vd11.
The optical filter uses cutoff filter or smalt, it is seen that the spectral reflectivity of optical band is low, repercussions
Section cut-off.
Refractive index nd1 >=1.90 of first lens, Abbe number Vd1≤40;The refractive index nd2 of second lens >=
1.80, Abbe number Vd2≤45;Refractive index nd8≤1.65 of 8th lens, Abbe number Vd8 >=55;Tenth lens
Refractive index nd10 >=1.75, Abbe number Vd10≤40.
Refractive index nd3 >=1.80 of the third lens, Abbe number Vd3≤45;The refractive index nd6 of 6th lens >=
1.85, Abbe number Vd6≤45.The concave surface of the third lens and the 6th lens is towards object space and image space.
Refractive index nd4 >=1.70 of 4th lens, Abbe number Vd4≤30;The refractive index nd5 of 5th lens >=
1.80, Abbe number Vd5≤45;Refractive index nd7≤1.65 of 7th lens, Abbe number Vd7≤50;9th lens
Refractive index nd9≤1.55, Abbe number Vd9 >=65;Refractive index nd11≤1.55 of 11st lens, Abbe number Vd11 >=
65.The convex surface of 4th lens, the 5th lens, the 7th lens, the 9th lens and the 11st lens
Towards object space and image space.
Fig. 2 to Fig. 7 is the optical performance curve figure that the utility model is applied to case study on implementation, in which:
Fig. 2 is the point range figure under the utility model visible light 436nm-656nm, and medium wavelength takes g light (436nm), F light
(486nm), e light (546nm), five wavelength of d light (588nm) and C light (656nm), weight ratio 3:7:10:8:3.It can by Fig. 2
Know, the disc of confusion under each visual field compares concentration, is distributed also relatively uniform.Meanwhile there is not the disc of confusion under some visual field
The phenomenon that separating to open very much up and down with wavelength illustrates that purple boundary disappears preferably.
Fig. 3 is the MTF curve figure under the utility model visible light 436nm-656nm.MTF curve figure represents an optics
The comprehensive solution of system, from the figure 3, it may be seen that full filed mtf value >=0.2 at 350lp/mm, imaging are apparent, meets wanting for 4K as level
It asks.In addition, MTF performance of the optical lens under each wavelength is also very good.
Fig. 4 is the curvature of field and distortion curve under the utility model visible light 436nm-656nm.Distortion curve indicates not
With the F-Theta distortion sizes values in the case of field angle, unit %.From fig. 4, it can be seen that F-Theta distorts its absolute value≤
0.5%.
Fig. 5 is the relative illumination curve graph under the utility model visible light 436nm-656nm.As shown in Figure 5, curve declines
Smoothly, angle value > 0.7 is contrasted under maximum field of view, imaging picture is brighter.
Fig. 6 is the defocus MTF curve figure under the utility model visible light 436nm-656nm, and what spatial frequency took is
200lp/mm, defocus range are -0.03mm to 0.03mm.The figure can reflect the degree of curvature of field correction.When a system exists
The curvature of field, as a result, center can not be synchronous clear with periphery, i.e., when field of view center is adjusted to clearest, edge is but not clear enough;
Need by readjustment reduce field of view center clarity come allow field of view edge more clearly.As seen from Figure 6, the curvature of field correct compared with
It is good.
Fig. 7 is the ratio chromatism, curve graph under the utility model visible light 436nm-656nm, passes through the figure combination pixel
The size of grain is known that the degree of ratio chromatism, correction.As shown in Figure 7, the ratio chromatism, of 436nm wavelength is big lower than 2 pixels
Small, purple boundary has elimination.
In the utility model case study on implementation, the whole focal length value of the optical lens is EFL, f-number FNO, field angle
For FOV, lens optical overall length TTL, image planes chief ray incidence angles CRA, and by object space side, by each mirror surface number consecutively,
The mirror surface of first lens 1 is R1, R2, and the mirror surface of the second lens 2 is R3, R4, and the mirror surface of the third lens 3 is R5, R6, the 4th lens
4 mirror surface is R6, R7, and the mirror surface of the 5th lens 5 is R8, R9, and the mirror surface of the 6th lens 6 is R10, R11, the mirror of the 7th lens 7
Face is R11, R12, and diaphragm 8, the mirror surface of the 8th lens 9 is R13, R14, and the mirror surface of the 9th lens 10 is R14, R15, the tenth lens
11 mirror surface is R16, R17, and the mirror surface of the 11st lens 12 is R17, R18, optical filter 13.
The utility model preferred parameter value (table one):
Circular diameter=Φ 5.335mm, TTL=44.15mm is imaged in EFL=1.661mm, FNO=2.0, FOV=185 °,
CRA≤13.47 °, photosensitive imaging chip are the IMX226 of SONY, unit: mm.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model;Meanwhile for the general technology of this field
Personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.In conclusion
The content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. a kind of 4K fish eye lens, which is characterized in that the fish eye lens includes: lens barrel, in the lens barrel from the object side to the image side
The optical lens being arranged successively are as follows: the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens,
Seven lens, diaphragm, the 8th lens, the 9th lens, the tenth lens, the 11st lens and optical filter;First lens, described
Two lens, the 8th lens and the tenth lens are the falcate glass lens with negative power, the third lens
It is the double concave glass lens with negative power, the 4th lens, the 5th lens, described the with the 6th lens
Seven lens, the 9th lens and the 11st lens are the lenticular glass lens with positive light coke;Described first thoroughly
Mirror, second lens, the 8th lens and the tenth lens convex surface towards object space, concave surface is towards image space.
2. 4K fish eye lens according to claim 1, which is characterized in that the third lens, the 4th lens are glued at one
It rises;6th lens, the 7th lens are glued together;8th lens, the 9th lens are glued together;Described tenth thoroughly
Mirror, the 11st lens are glued together.
3. 4K fish eye lens according to claim 1, which is characterized in that the optical filter using cutoff filter or
Smalt.
4. 4K fish eye lens according to claim 1, which is characterized in that refractive index nd1 >=1.90 of first lens,
Abbe number Vd1≤40;Refractive index nd2 >=1.80 of second lens, Abbe number Vd2≤45;The refraction of 8th lens
Rate nd8≤1.65, Abbe number Vd8 >=55;Refractive index nd10 >=1.75 of tenth lens, Abbe number Vd10≤40.
5. 4K fish eye lens according to claim 1, which is characterized in that refractive index nd3 >=1.80 of the third lens,
Abbe number Vd3≤45;Refractive index nd6 >=1.85 of 6th lens, Abbe number Vd6≤45.
6. 4K fish eye lens according to claim 1, which is characterized in that the third lens and the 6th lens it is recessed
Facing towards object space and image space.
7. 4K fish eye lens according to claim 1, which is characterized in that refractive index nd4 >=1.70 of the 4th lens,
Abbe number Vd4≤30;Refractive index nd5 >=1.80 of 5th lens, Abbe number Vd5≤45;The refraction of 7th lens
Rate nd7≤1.65, Abbe number Vd7≤50;Refractive index nd9≤1.55 of 9th lens, Abbe number Vd9 >=65;Described
Refractive index nd11≤1.55 of 11 lens, Abbe number Vd11 >=65.
8. 4K fish eye lens according to claim 1, which is characterized in that the 4th lens, the 5th lens, described
The convex surface of 7th lens, the 9th lens and the 11st lens is towards object space and image space.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109061841A (en) * | 2018-10-22 | 2018-12-21 | 厦门爱劳德光电有限公司 | A kind of 4K fish eye lens |
CN110376725A (en) * | 2019-07-25 | 2019-10-25 | 上海电机学院 | A kind of fish eye lens system |
CN111657823A (en) * | 2020-04-30 | 2020-09-15 | 北京航空航天大学 | Wide-spectrum endoscope imaging adapter |
-
2018
- 2018-10-22 CN CN201821708045.4U patent/CN208818915U/en active Active
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109061841A (en) * | 2018-10-22 | 2018-12-21 | 厦门爱劳德光电有限公司 | A kind of 4K fish eye lens |
CN109061841B (en) * | 2018-10-22 | 2024-02-06 | 厦门爱劳德光电有限公司 | 4K fish-eye lens |
CN110376725A (en) * | 2019-07-25 | 2019-10-25 | 上海电机学院 | A kind of fish eye lens system |
CN111657823A (en) * | 2020-04-30 | 2020-09-15 | 北京航空航天大学 | Wide-spectrum endoscope imaging adapter |
CN111657823B (en) * | 2020-04-30 | 2021-08-03 | 北京航空航天大学 | A Broad Spectrum Endoscope Imaging Adapter |
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