CN107422461A - Monitoring camera - Google Patents
Monitoring camera Download PDFInfo
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- CN107422461A CN107422461A CN201710868691.0A CN201710868691A CN107422461A CN 107422461 A CN107422461 A CN 107422461A CN 201710868691 A CN201710868691 A CN 201710868691A CN 107422461 A CN107422461 A CN 107422461A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- Optics & Photonics (AREA)
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Abstract
The present invention, which provides a kind of monitoring camera, includes the first lens group, the second lens group and diaphragm, and the first lens group sequentially includes the first lens with negative power, the second lens with positive light coke and the 3rd lens with negative power from thing side to imaging surface；Second lens group includes the 4th lens, the 5th lens with positive light coke and the 6th lens with negative power with positive light coke from thing side to imaging surface；First lens, the second lens, the 5th lens use glass spheric glass, and the 3rd lens, the 4th lens and the 6th lens use plastic cement aspherical lens, and the optical centre of each lens is located along the same line.The present invention reduces lens numbers, it is low to reduce lens length, weight and manufacturing cost by using 3 plastic cement aspherical lens；Distributed by matching combination, rational focal power and the airspace of unlike material eyeglass, the aberration of camera lens is effectively corrected and have the advantages that high and low temperature generation focus drifting amount is small.
Description
Technical field
The present invention relates to pick-up lens technical field, more particularly to a kind of monitoring camera.
Background technology
With the fast development of science and technology, people there has also been higher level understanding to security protection, and monitoring camera is absurd fantastic immediately
It is raw.In recent years, monitoring camera has become a big main force of security protection industry, promote security protection industry constantly advance and it is fast
Speed development, the species of monitoring camera becomes increasingly abundant also with the continuous vast of security protection market, but extensive with monitoring camera
Use, people increasingly pay attention to performance issues such as the quality of its imaging effect, the sizes of field of view angle.
Existing monitoring camera sequentially includes the first lens group, diaphragm and the second lens along optical axis from thing side to imaging surface
Group, by the optical combination of different eyeglasses in the first lens group, diaphragm and the second lens group, shown so as to reach different imagings
Effect.
Existing monitoring camera generally existing is always grown up, visual angle is small, temperature influences big, solution as quality is low, target surface is small, cost
The defects of high.Day and night confocal camera lens such as patent document CN105301739A uses three plastic material aspherical lens and 2
Sheet glass eyeglass, its field of view angle is too small, overall length is long；Such as patent document CN105388591A big target surface day and night confocal monitoring
The number of lenses that camera lens is up to 12, adds cost, and field of view angle is too small, and solution is as poor quality；Such as patent document
CN102323657A security protection day and night lens, differentiated although improving camera lens by using the aspherical plastic material eyeglass of multi-disc
Rate, overall length is reduced, but angle of view degree is not big enough, target surface is too small.
The content of the invention
Based on this, monitoring camera big it is an object of the invention to provide a kind of angle of visual field and high image quality.
A kind of monitoring camera, include the first lens group, the second lens group and located at described from thing side to imaging surface along optical axis
Diaphragm between first lens group and second lens group；
First lens group sequentially includes the first lens with negative power from thing side to the imaging surface, with just
Second lens of focal power and the 3rd lens with negative power；
Second lens group sequentially includes the 4th lens with positive light coke from thing side to the imaging surface, with just
5th lens of focal power and the 6th lens with negative power；
First lens, second lens, the 5th lens use glass spheric glass, and the described 3rd is saturating
Mirror, the 4th lens and the 6th lens use plastic cement aspherical lens, and the optical centre of each lens is positioned at same
On one straight line.
Above-mentioned monitoring camera is day and night wide angle monitoring lens, by using the design of three plastic cement aspherical lens,
Lens numbers can be reduced, effectively reduce camera lens total length, weight and manufacturing cost, and then cause the monitoring camera
Service life is long, stability is high, while matching combination, rational focal power and the airspace point for passing through unlike material eyeglass
Match somebody with somebody, the aberration of camera lens is effectively corrected and have the advantages that high and low temperature generation focus drifting amount is small, the monitoring camera
By first lens group and the Combination Design of second lens group, regarded so that the monitoring camera has not less than 137 °
Rink corner and target surface are more than 1/2.7 " high imaging quality effect, the monitoring camera imaging clearly, sharpness be high, big target surface and can
The CMOS chip of matching 1/2.7 ".
Further, first lens use meniscus lens of the concave surface towards the imaging surface, second lens,
4th lens and the 5th lens use lenticular lens, and the 3rd lens use double concave type lens, and described
Six lens use the meniscus lens convex surface facing the imaging surface.
Further, the monitoring camera meets conditional：
WhereinFirst lens strength is represented,The focal power of the monitoring camera is represented,Described in expression
The combination focal power of first lens group,Represent the combination focal power of second lens group.
Further, the monitoring camera meets relational expression：3.5<TL/IH<8.5, wherein TLRepresent the monitoring camera
Optics overall length, IH represent half image height of the monitoring camera.
Further, the monitoring camera meets conditional：35 ＜ | V5-V6 | ＜ 60, wherein V5 represent that the described 5th is saturating
The Abbe number of mirror, V6 represent the Abbe number of the 6th lens.
Further, the monitoring camera meets conditional：- 0.7 ＜ (R61-R62)/(R61+R62) ＜ -0.2, wherein
R61 represents the vertex curvature radius of the 6th lens thing side, and R62 represents the vertex curvature half of the 6th lens image side surface
Footpath.
Further, the 3rd lens, the 4th lens, the aspherical surface shape of the 6th lens are satisfied by
Following equations：
Wherein z represents that curved surface leaves distance of the curved surface summit in optical axis direction, and c is the curvature corresponding to radius, and h is radially
Coordinate (its unit is identical with length of lens unit), K are circular cone whose conic coefficient, B, C, D, E represent respectively quadravalence, six ranks,
Coefficient corresponding to eight ranks, ten rank radial coordinates.
Further, the monitoring camera also includes an optical filter, and the optical filter is on rear side of the 6th lens.
Further, the optical filter is using any one in visible light wave range optical filter or infrared fileter.
Further, the diaphragm is made of light-shielding sheet, and the middle part of the diaphragm is provided with light hole, the light hole
Using the through-hole structure of circle.
Brief description of the drawings
Fig. 1 is the cross section structure schematic diagram of monitoring camera in the embodiment of the present invention；
Fig. 2 is the curvature of field curve map of monitoring camera in first embodiment of the invention；
Fig. 3 is the distortion curve figure of monitoring camera in first embodiment of the invention；
Fig. 4 is that the differential of penalty kick dyeing is intended on the axle of monitoring camera in first embodiment of the invention；
Fig. 5 is the MTF curve of monitoring camera in first embodiment of the invention；
Fig. 6 is 80 DEG C of analysis diagram of monitoring camera in first embodiment of the invention；
Fig. 7 is -20 DEG C of analysis diagram of monitoring camera in first embodiment of the invention；
Fig. 8 is the curvature of field curve map of monitoring camera in second embodiment of the invention；
Fig. 9 is the distortion curve figure of monitoring camera in second embodiment of the invention；
Figure 10 is that the differential of penalty kick dyeing is intended on the axle of monitoring camera in second embodiment of the invention；
Figure 11 is the MTF curve of monitoring camera in second embodiment of the invention；
Figure 12 is the curvature of field curve map of monitoring camera in third embodiment of the invention；
Figure 13 is the distortion curve figure of monitoring camera in third embodiment of the invention；
Figure 14 is that the differential of penalty kick dyeing is intended on the axle of monitoring camera in third embodiment of the invention；
Figure 15 is the MTF curve of monitoring camera in third embodiment of the invention；
Essential element symbol description
| Monitoring camera | 100 | First lens group | 10 |
| First lens | 11 | Second lens | 12 |
| 3rd lens | 13 | Second lens group | 20 |
| 4th lens | 21 | 5th lens | 22 |
| 6th lens | 23 | Diaphragm | 30 |
| Optical filter | 31 | Cover glass | 32 |
| Imaging surface | 33 |
Following embodiment will combine above-mentioned accompanying drawing and further illustrate the present invention.
Embodiment
For the ease of more fully understanding the present invention, the present invention is carried out further below in conjunction with related embodiment accompanying drawing
Explain.Embodiments of the invention are given in accompanying drawing, but the present invention is not limited in above-mentioned preferred embodiment.Conversely, there is provided
The purpose of these embodiments is in order that disclosure of the invention face is more abundant.
Referring to Fig. 1, be the cross section structure schematic diagram of monitoring camera in the embodiment of the present invention 100, the monitoring camera 100
33 include the first lens group 10, the second lens group 20 and located at first lens group 10 and institute from thing side to imaging surface along optical axis
State the diaphragm 30 between the second lens group 20；
First lens group 10 from thing side to the imaging surface 33 sequentially include with negative power the first lens 11,
The second lens 12 with positive light coke and the 3rd lens 13 with negative power；
Second lens group 20 from thing side to the imaging surface 33 sequentially include with positive light coke the 4th lens 21,
The 5th lens 22 with positive light coke and the 6th lens 23 with negative power；
First lens 11, second lens 12, the 5th lens 22 use glass spheric glass, and described
Three lens 13, the 4th lens 21 and the 6th lens 23 use plastic cement aspherical lens, and the optics of each lens
It is centrally located on same straight line.
First lens 11 use meniscus lens of the concave surface towards the imaging surface 33, second lens 12, institute
State the 4th lens 21 and the 5th lens 22 use lenticular lens, the 3rd lens 13 use double concave type lens, institute
The 6th lens 23 are stated using the meniscus lens convex surface facing the imaging surface 33.
3rd lens 13, the 4th lens 21, the aspherical surface shape of the 6th lens 23 are satisfied by down
Establish an equation：
Wherein, z represents that curved surface leaves distance of the curved surface summit in optical axis direction, and c is the curvature corresponding to radius, and h is footpath
To coordinate (its unit is identical with length of lens unit), K is circular cone whose conic coefficient, and B, C, D, E represent quadravalence, six respectively
Rank, eight ranks, the coefficient corresponding to ten rank radial coordinates.When K is less than -1, face shape curve is hyperbola, is parabolic during equal to -1
Line, it is ellipse when between -1 to 0, is circle during equal to 0, is oblateness during more than 0.Can accurately it be set by above parameter
The face molded dimension of both-sided aspherical before and after fix-focus lens.Aspherical shape meets even aspheric surface equation, using different aspherical
Coefficient, aspherical effect in systems is performed to maximum, obtain more perfect resolving power, it is preferred that pass through above-mentioned song
Face equation can accurately set the 3rd lens 13, the 4th lens 21 and the aspherical face of the 6th eyeglass 23
Type, using the aspherical powerful calibration function to aberration, so as to greatly improve the imaging definition of the monitoring camera 100 and sharp
Sharp degree.
The monitoring camera 100 also includes an optical filter 31, and the optical filter 31 is located at the rear side of the 6th lens 23.
The optical filter 31 is using any one in visible light wave range optical filter or infrared fileter, it is seen that light with it is closely red
Outer light is respectively daytime and night service band, by the design of the optical filter 31, and then suppresses inoperative band of light and passes through, can be with
The aberration and veiling glare of optical system are effectively reduced, lifts imaging effect.
The diaphragm 30 is made of light-shielding sheet, and the effect of the diaphragm 30 is accurately to adjust thang-kng amount.In order in light
Clearly picture was photographed under the dark scene of line, it is necessary to larger luminous flux camera lens, therefore by setting the diaphragm 30, favorably
The chief ray incident angle (CRA) of the imaging surface 33 is reached in control, CRA can be effectively controlled within 27 ± 3 degree, more
Meet the incident requirement of chip, and the diaphragm 30 done using light-shielding sheet, and then farthest ensure that the accuracy of processing,
Mismachining tolerance is reduced, is conveniently adjusted, the middle part of the diaphragm 30 is provided with light hole, and the light hole is used to facilitate the diaphragm 30
Regulation to light, the light hole is using circular through-hole structure.
Specifically, the diaphragm 30 can improve the angle of visual field and can preferably coordinate located at the rear side of the 3rd lens 13
The incident angle of chip, the diaphragm 30 is made by using light-shielding sheet, lens barrel light hole is required to reduce, made under shaping difficulty
Drop, improves productivity ratio and reduces production cost.
By the Combination Design of first lens group 10 and second lens group 20 in the present invention, to reach, have can
See light and the near infrared light effect that focal plane does not drift about, it is preferred that the monitoring camera 100 uses low dispersion material, and then
Aberration is effectively reduced, farthest reduces purple boundary phenomenon.
In all embodiments of the invention, the cross section structure of the monitoring camera 100 is as shown in figure 1, the monitoring
Camera lens 100 is day and night wide angle monitoring lens, by using the design of three plastic cement aspherical lens, it is possible to reduce number of lenses
Amount, effectively reduces camera lens total length, weight and manufacturing cost, so cause the service life of monitoring camera 100 it is long,
Stability is high, while is distributed by matching combination, rational focal power and the airspace of unlike material eyeglass, makes the picture of camera lens
Difference is effectively corrected and has the advantages that high and low temperature produces that focus drifting amount is small, and the monitoring camera 100 passes through described the
The Combination Design of one lens group 10 and second lens group 20, so that the monitoring camera 100, which has, is not less than 137 ° of visual fields
Angle and target surface are more than 1/2.7 " high imaging quality effect, the imaging clearly of monitoring camera 100, sharpness be high, big target surface and
1/2.7 can be matched " CMOS chip.
In following different embodiment, the relevant parameter of each eyeglass is referring to each embodiment in the monitoring camera 100
Parameter list.
Embodiment 1
Referring to Fig. 1, the cross section structure schematic diagram of the monitoring camera 100 provided for first embodiment of the invention, wherein originally
The relevant parameter of each eyeglass in the monitoring camera 100 that embodiment provides refers to table 1.
Table 1
The 3rd lens 13 in the present embodiment, the 4th lens 21, the aspherical parameter of the 6th lens 23
As shown in table 2.
Table 2
| Surface sequence number | K | B | C | D | E |
| 5 | 3.70E+00 | -6.20E-03 | 2.00E-02 | -6.64E-03 | 1.20E-03 |
| 6 | -8.30E+01 | -2.54E-02 | 2.95E-02 | -1.01E-02 | 1.94E-03 |
| 8 | -2.80E+01 | -2.71E-04 | -1.37E-03 | 2.81E-04 | -3.99E-05 |
| 9 | -1.75E+01 | -3.95E-02 | 8.48E-03 | -2.22E-03 | 1.17E-04 |
| 12 | -3.13E+00 | -2.96E-02 | 6.19E-03 | -9.09E-04 | 5.51E-05 |
| 13 | -1.36E+01 | -9.12E-03 | 3.84E-03 | -4.46E-04 | 2.20E-05 |
Fig. 2 and Fig. 3, the respectively curvature of field of the monitoring camera 100 in embodiment 1 and distortion curve figure are referred to, its
Penalty kick difference chromatic curve on the axle at visual field end by Fig. 2 to Fig. 4 as shown in figure 4, can be seen that：Spherical aberration is put on the curvature of field, distortion and axle
Aberration is all well corrected.Its MTF curve is Fig. 5, embodies camera lens good resolution ratio and resolving power.Fig. 6 and Fig. 7 is ring
Border temperature embodies that the parsing of camera lens high/low temperature is good and environment temperature is widely varied and is in the analysis diagram of 80 DEG C and -20 DEG C
Focus drifting amount is in 5um or so.
Embodiment 2
The monitoring camera 100 that the present embodiment provides is more or less the same with first embodiment, and difference is, among this implementation
The relevant parameter of each eyeglass among the relevant parameter and first embodiment of each eyeglass of monitoring camera has differences.It please join
Table 3 is read, for the relevant parameter of each eyeglass of the monitoring camera 100 among the present embodiment.
Table 3
The 3rd lens 13 in the present embodiment, the 4th lens 21, the aspherical parameter of the 6th lens 23
As shown in table 4.
Table 4
| Surface sequence number | K | B | C | D | E |
| 5 | 3.71E+00 | -1.25E-02 | 1.95E-02 | -6.26E-03 | 1.15E-03 |
| 6 | -6.32E+01 | -2.76E-02 | 2.76E-02 | -1.01E-02 | 2.07E-03 |
| 8 | -2.28E+01 | -4.88E-04 | -1.30E-03 | 6.11E-05 | 1.04E-05 |
| 9 | -1.36E+01 | -3.66E-02 | 7.84E-03 | -2.53E-03 | 1.43E-04 |
| 12 | -2.85E+00 | -2.75E-02 | 6.08E-03 | -1.05E-03 | 7.38E-05 |
| 13 | -1.17E+01 | -6.18E-03 | 3.41E-03 | -4.28E-04 | 2.36E-05 |
Fig. 8 and Fig. 9 are referred to, the curvature of field and distortion curve of the monitoring camera 100 provided for embodiment 2, its visual field
Penalty kick difference chromatic curve is as shown in Figure 10 on the axle at end, and its MTF curve is as shown in figure 11, and institute is can be seen that according to Fig. 8 to Figure 11
State penalty kick dyeing difference on the curvature of field, distortion and the axle of monitoring camera 100 all well to be corrected, while there is good resolving power.
Embodiment 3
The monitoring camera 100 that the present embodiment provides is more or less the same with first embodiment, and difference is, among this implementation
It is poor that the relevant parameter of each eyeglass among the relevant parameter and first embodiment of each eyeglass of the monitoring camera 100 is present
It is different.Table 5 is referred to, for the relevant parameter of each eyeglass of the monitoring camera 100 among the present embodiment.
Table 5
3rd lens 13 of the present embodiment, the 4th lens 21, the 6th lens 23 aspherical parameter such as
Shown in table 6.
Table 6
| Surface sequence number | K | B | C | D | E |
| 5 | 3.66E+00 | -1.00E-02 | 1.95E-02 | -6.52E-03 | 1.26E-03 |
| 6 | -1.61E+02 | -2.72E-02 | 2.81E-02 | -1.04E-02 | 2.09E-03 |
| 8 | -2.92E+01 | 1.99E-04 | -1.07E-03 | 2.90E-04 | -6.54E-05 |
| 9 | -1.43E+01 | -3.82E-02 | 8.36E-03 | -2.37E-03 | 9.91E-05 |
| 12 | -3.20E+00 | -2.88E-02 | 6.05E-03 | -9.67E-04 | 6.15E-05 |
| 13 | -1.51E+01 | -7.73E-03 | 3.66E-03 | -4.64E-04 | 2.44E-05 |
Figure 12 and 13 are referred to, the curvature of field and distortion curve of the monitoring camera 100 provided for embodiment 3, its visual field
Penalty kick difference chromatic curve is as shown in figure 14 on the axle at end, and its MTF curve is as shown in figure 15, can be seen that according to Figure 12 to Figure 15
Penalty kick dyeing difference is all well corrected on the curvature of field of the monitoring camera 100, distortion and axle, while has good solution as energy
Power.
Table 7 is referred to, it is described for optical characteristics corresponding to each embodiment among above-mentioned 3 embodiments, including system focal length
F, F-number F#, system overall length TL, the θ of the angle of visual field 2, and numerical value corresponding with above each conditional.
Table 7
To limit the overall length of system, and ensure that system has image quality good enough, the monitoring camera 100 meets to close
It is formula：3.5<TL/IH<8.5；
Wherein, TLThe optics overall length of the monitoring camera 100 is represented, IH represents half image height of the monitoring camera 100.When
TLWhen/IH value exceedes the upper limit, the overall length of the overall monitoring camera 100 is long, in other words if overall shorten system overall length
In the case of, image height can deficiency；Work as TLWhen/IH value exceedes lower limit, because each power of lens is excessive, camera lens aberration correction
Difficulty, resolving power are remarkably decreased.
In the present invention, to provide suitable Lens while good correction aberration, the monitoring camera 100 is full
Sufficient conditional：
WhereinThe focal power of first lens 11 is represented,The focal power of the monitoring camera 100 is represented,Table
Show the combination focal power of first lens group 10,Represent the combination focal power of second lens group 20.
WhenValue when exceeding the upper limit, the focal power of first lens 11 is too strong, although can reach quick receipts
The purpose of light, system overall length is set to diminish, but its caused astigmatism, the curvature of field, distortion are excessive, it is difficult to correct, while the song of its eyeglass
Rate radius can reduce, and improve difficulty of processing, and increase systematic error；WhenValue when exceeding lower limit, first lens 11
Focal power weaken, above-mentioned various aberrations are relatively reduced, but its refractive power decline cause system to lengthen.
ConditionalThe ratio between focal power of first lens group 10 and whole lens combination is defined, can be effective
Wide visual field angle object plane light is converged and entered in the monitoring camera 100, and face produces larger aberration.WhenValue exceed it is upper
In limited time, the focal power of first lens group 10 is too strong, although system overall length can be made to diminish, its caused spherical aberration is excessive,
It is difficult to correct；WhenValue when exceeding lower limit, the focal power of the 3rd lens 13 weakens, and spherical aberration is relatively reduced, but it is bent
Light ability, which declines, causes system overall length to lengthen.
ConditionalThe ratio between focal power of second lens group 20 and whole lens group is defined, described second is saturating
The combination focal power of microscope group 20 is formed with first lens group 10 and echoed, and can effectively coordinate first lens group 10, and
Rationally remove aberration.WhenValue when exceeding the upper limit, the focal power of the 6th lens 23 is too strong, can make system overall length
Diminish, but its caused spherical aberration, astigmatism, the curvature of field are excessive, it is difficult to correct；WhenValue when exceeding lower limit, the 6th lens
23 focal power weakens, and above-mentioned aberration is relatively reduced, but the decline of its refractive power causes system to lengthen.
To correct aberration, the monitoring camera 100 meets conditional：35 ＜ | V5-V6 | ＜ 60, wherein V5 represent described the
The Abbe number of five lens 22, V6 represent the Abbe number of the 6th lens 23；
Wherein V5 represents the Abbe number of the 5th lens 22, and V6 represents the Abbe number of the 6th lens 23.When | V5-
V6 | value when exceeding lower limit, the undercorrection of aberration；As | V5-V6 | value when exceeding the upper limit, then material selection is difficult.
Meet conditional for the correction curvature of field and distortion, the monitoring camera 100：- 0.7 ＜ (R61-R62)/(R61+R62)
＜ -0.2；
Wherein, R61 represents the vertex curvature radius of the thing side of the 6th lens 23, and R62 represents the 6th lens 23
The vertex curvature radius of image side surface.Above-mentioned relation formula defines the shape of the 6th lens 23 with negative power, when
(R61-R62) when/(R61+R62) value exceedes the upper limit, its distortion can reduce, but curvature of field correction is difficult；When (R61-R62)/
(R61+R62) when value exceedes lower limit, its curvature of field can reduce, but distortion correction is difficult.
To sum up, the present invention has the following advantages that compared with prior art：
(1) camera lens of the invention uses 3 plastic cement aspherical lens, it is possible to reduce lens numbers, effectively reduces camera lens length
Degree, weight and manufacturing cost are low；Combined simultaneously by the matching of unlike material eyeglass, rational focal power and airspace are divided
Match somebody with somebody, making the aberration of camera lens obtain effectively correcting, imaging effect is good and to have the advantages that high and low temperature produces focus drifting amount small；
(2) camera lens of the invention is with visible ray and near infrared light not focal plane drift；
(3) the advantages that lens imaging of the invention is clear, sharpness is high, big target surface, can match 1/2.7 " CMOS chip；
(4) camera lens of the invention can reach more than 137 ° of the big angle of visual field；
(5) camera lens of the invention employs low dispersion material, effectively reduces aberration, farthest reduces purple boundary and shows
As.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of monitoring camera, the first lens group, the second lens group are included from thing side to imaging surface along optical axis and located at described the
Diaphragm between one lens group and second lens group, it is characterised in that：
First lens group sequentially includes the first lens with negative power from thing side to the imaging surface, with positive light focus
Second lens of degree and the 3rd lens with negative power；
Second lens group sequentially includes the 4th lens with positive light coke from thing side to the imaging surface, with positive light focus
5th lens of degree and the 6th lens with negative power；
First lens, second lens, the 5th lens use glass spheric glass, the 3rd lens, institute
State the 4th lens and the 6th lens use plastic cement aspherical lens, and the optical centre of each lens is located at same straight line
On.
2. monitoring camera according to claim 1, it is characterised in that first lens use concave surface towards the imaging
The meniscus lens in face, second lens, the 4th lens and the 5th lens use lenticular lens, and described
Three lens use double concave type lens, and the 6th lens use the meniscus lens convex surface facing the imaging surface.
3. monitoring camera according to claim 2, it is characterised in that the monitoring camera meets conditional：
WhereinFirst lens strength is represented,The focal power of the monitoring camera is represented,Represent that described first is saturating
The combination focal power of microscope group,Represent the combination focal power of second lens group.
4. monitoring camera according to claim 2, it is characterised in that the monitoring camera meets relational expression：3.5<TL/IH<
8.5, wherein TLThe optics overall length of the monitoring camera is represented, IH represents half image height of the monitoring camera.
5. monitoring camera according to claim 1, it is characterised in that the monitoring camera meets conditional：35 ＜ | V5-
V6 | ＜ 60, wherein V5 represent the Abbe number of the 5th lens, and V6 represents the Abbe number of the 6th lens.
6. monitoring camera according to claim 1, it is characterised in that the monitoring camera meets conditional：- 0.7 ＜
(R61-R62)/(R61+R62) ＜ -0.2, wherein R61 represent the vertex curvature radius of the 6th lens thing side, and R62 is represented
The vertex curvature radius of the 6th lens image side surface.
7. monitoring camera according to claim 1, it is characterised in that the 3rd lens, the 4th lens, described
The aspherical surface shape of six lens is satisfied by following equations：
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<mo>+</mo>
<msup>
<mi>Eh</mi>
<mn>10</mn>
</msup>
<mo>,</mo>
</mrow>
Wherein z represents that curved surface leaves distance of the curved surface summit in optical axis direction, and c is the curvature corresponding to radius, and h is radial coordinate
(its unit is identical with length of lens unit), K are circular cone whose conic coefficient, B, C, D, E represent respectively quadravalence, six ranks, eight ranks,
Coefficient corresponding to ten rank radial coordinates.
8. monitoring camera according to claim 1, it is characterised in that the monitoring camera also includes an optical filter, described
Optical filter is on rear side of the 6th lens.
9. monitoring camera according to claim 8, it is characterised in that the optical filter using visible light wave range optical filter or
Any one in infrared fileter.
10. monitoring camera according to claim 1, it is characterised in that the diaphragm is made of light-shielding sheet, and the light
The middle part of door screen is provided with light hole, and the light hole is using circular through-hole structure.
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Application publication date: 20171201 Assignee: Zhongshan Liantuo Optical Co.,Ltd. Assignor: JIANGXI LIANCHUANG ELECTRONIC Co.,Ltd. Contract record no.: X2023980040632 Denomination of invention: Surveillance Camera Granted publication date: 20211116 License type: Common License Record date: 20230828 |