CN208126004U - A kind of tight shot - Google Patents
A kind of tight shot Download PDFInfo
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- CN208126004U CN208126004U CN201820391616.XU CN201820391616U CN208126004U CN 208126004 U CN208126004 U CN 208126004U CN 201820391616 U CN201820391616 U CN 201820391616U CN 208126004 U CN208126004 U CN 208126004U
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Abstract
The utility model discloses a kind of tight shots, temperature drift, the problem of image quality difference occur to solve monitoring camera imaging in the prior art.Including：The first lens being arranged successively from the object side to the image side are to the 8th lens；First lens, the third lens, the 6th lens and the 7th lens are glass lens；Second lens and the 5th lens are negative-power lenses, and the 4th lens and the 8th lens are positive power lens；0.61≤(f4*f8)/(f2*f5)≤0.69, f2 is the focal length of the second lens, and f4 is the focal length of the 4th lens, and f5 is the focal length of the 5th lens, and f8 is the focal length of the 8th lens.The tight shot image quality is good, will not run coke under the larger environment of the temperature difference.
Description
Technical field
The utility model relates to lens technology field, in particular to a kind of tight shot.
Background technique
With the rapid development of safety monitoring industry, requirement of the safety defense monitoring system to monitoring camera is more and more professional, tight
Lattice.Monitoring camera is widely used in indoor and outdoor, daily 24 hours 365 days 1 year in running order, rings locating for monitoring camera
Border temperature change is huge.The typical operating temperature requirements of monitoring camera are -40 DEG C~80 DEG C, and monitoring camera must assure that in this temperature
Difference reach more than 120 degrees Celsius in the range of, be imaged without re-focusing it is still clear with 20 DEG C (room temperature)
It is clear.
Since the refractive index of eyeglass material can be affected by temperature and change, lens dimension, lens barrel material, microscope base material
It can expand with heat and contract with cold with the variation of temperature, these factors cause common lens to will appear different imagings under high and low temperature environment
Burnt (rear cut-off distance), the referred to as temperature drift of lens imaging seriously affect the image quality of camera lens afterwards.
In view of this, it is a kind of with temperature compensation function it is necessory to provide, it is used also not under the larger environment of the temperature difference
Burnt tight shot can be run, image quality is improved.
Utility model content
The utility model embodiment discloses a kind of tight shot, temperature occurs to solve lens imaging in the prior art
Drift, the problem of image quality difference.
In order to achieve the above objectives, the utility model embodiment discloses a kind of tight shot, including：From the object side to the image side according to
The first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th of secondary arrangement
Lens；
Second lens and the 5th lens are negative-power lenses, and the 4th lens and the 8th lens are
Positive power lens；
Lens meet the following conditions：
0.61≤(f4*f8)/(f2*f5)≤0.69, wherein f2 is the focal length of the second lens, and f4 is the coke of the 4th lens
Away from f5 is the focal length of the 5th lens, and f8 is the focal length of the 8th lens.
Further, first lens and the 7th lens are concave-convex negative power glass lens；
The third lens are concave-convex positive light coke glass lens；
6th lens are biconvex positive light coke glass lens.
Further, second lens, the 4th lens, the 5th lens and the 8th lens are that plastics are saturating
Mirror.
Further, second lens, the 4th lens, the 5th lens and the 8th lens are concave-convex non-
Spherical lens.
Further, second focal length of lens f2=-80.13mm；4th focal length of lens f4=64.54mm；Institute
State the 5th focal length of lens f5=-13.98mm；8th focal length of lens f8=11.30mm, wherein "-" indicates that direction is negative.
Further, lens also meet the following conditions：
5mm≤f6≤7mm, wherein f6 is the focal length of the 6th lens；
0.063≤(nd4/vd4)=(nd5/vd5)≤0.072, wherein nd4 is the refractive index of the 4th lens, vd4 the
The abbe number of four lens, nd5 are the refractive index of the 5th lens, and vd5 is the abbe number of the 5th lens.
Further, the 6th focal length of lens f6=5.72mm.
Further, the refractive index nd4=1.635518 of the 4th lens, the abbe number vd4=of the 4th lens
23.971756；
The refractive index nd5=1.635518 of 5th lens, the abbe number vd5=23.971756 of the 5th lens.
Further, 1.43≤nd6≤1.61, wherein nd6 is the refractive index of the 6th lens.
Further, the refractive index nd6=1.437 of the 6th lens.
Further, 1.50≤nd8≤1.55, wherein nd8 is the refractive index of the 8th lens.
Further, the 8th index of refraction in lens nd8=1.535.
Further, the 6th lens and the 7th lens group are at glued lens group.
Further, the concave surface of second lens and the 7th lens is towards object space；
First lens, the third lens, the 4th lens, the 5th lens, the 6th lens and institute
The convex surfaces of the 8th lens is stated towards object space.
The utility model embodiment discloses a kind of tight shot, including：First be arranged successively from the object side to the image side is thoroughly
Mirror, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens；Described first thoroughly
Mirror, the third lens, the 6th lens and the 7th lens are glass lens；Second lens and the described 5th are thoroughly
Mirror is negative-power lenses, and the 4th lens and the 8th lens are positive power lens；Lens meet the following conditions：
0.61≤(f4*f8)/(f2*f5)≤0.69, wherein f2 is the focal length of the second lens, and f4 is the focal length of the 4th lens, f5 the
The focal length of five lens, f8 are the focal length of the 8th lens.Due in the utility model embodiment, the second lens and the 5th lens
Focal power is negative, and the 4th lens and the 8th power of lens are positive, and lens satisfaction 0.61≤(f4*f8)/(f2*f5)≤
0.69, so that the tight shot has temperature compensation function, under the larger environment of the temperature difference, such as -30 degrees Celsius to 80 degrees Celsius
Temperature range use will not run coke, and image quality is high.
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
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the tight shot schematic diagram that a kind of glass provided by the embodiment of the utility model moulds mixed structure；
Fig. 2 is mtf value schematic diagram of the tight shot provided by the embodiment of the utility model at 20 degrees Celsius；
Fig. 3 is mtf value schematic diagram of the tight shot provided by the embodiment of the utility model at 20 degrees Celsius；
Fig. 4 is tight shot provided by the embodiment of the utility model mtf value schematic diagram at -30 degrees Celsius；
Fig. 5 is tight shot provided by the embodiment of the utility model mtf value schematic diagram at+80 degrees Celsius；
Fig. 6 is the curvature of field figure of tight shot provided by the embodiment of the utility model；
Fig. 7 is the aberration characteristic figure of tight shot provided by the embodiment of the utility model；
Fig. 8 is the corresponding axial chromatic aberration figure of visible light part of tight shot provided by the embodiment of the utility model.
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 creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
Embodiment 1：
The utility model embodiment discloses a kind of tight shot of glass modeling mixed structure, including：From the object side to the image side according to
The first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th of secondary arrangement
Lens；
Second lens and the 5th lens are negative-power lenses, and the 4th lens and the 8th lens are
Positive power lens；
Lens meet the following conditions：
0.61≤(f4*f8)/(f2*f5)≤0.69, wherein f2 is the focal length of the second lens, and f4 is the coke of the 4th lens
Away from f5 is the focal length of the 5th lens, and f8 is the focal length of the 8th lens.
In the utility model embodiment, tight shot includes eight lens, is arranged successively referred to as the from the object side to the image side
One lens to the 8th lens.Each lens have its corresponding focal power direction, may be positive, may be negative, specifically, second is saturating
The focal power of mirror is negative, and the 5th power of lens is negative, and the 4th power of lens is positive, and the 8th power of lens is
Just.
Each lens have its corresponding focal length, may be positive, and may be negative, specifically, the focal length of the second lens, the 4th
The focal length of lens, the focal length of the 5th lens, the focal length of the 8th lens meet following formula：0.61≤(f4*f8)/(f2*f5)≤
0.69, wherein f2 is the focal length of the second lens, and f4 is the focal length of the 4th lens, and f5 is the focal length of the 5th lens, and f8 is the 8th saturating
The focal length of mirror.
Lens are not limited in this embodiment there are also its corresponding shape, material and other parameters.
Since in the utility model embodiment, the second lens and the 5th power of lens are negative, the 4th lens and
Eight power of lens are positive, and lens meet 0.61≤(f4*f8)/(f2*f5)≤0.69, so that the tight shot has temperature
Compensation function is spent, under the larger environment of the temperature difference, such as -30 degrees Celsius to 80 degree Celsius temperature range uses will not run coke, at
Image quality amount is high.
Embodiment 2：
In order to further increase image quality, Fig. 1 is that a kind of glass provided by the embodiment of the utility model moulds mixed structure
Tight shot schematic diagram, the tight shot include：The first lens 1, the second lens 2, third being arranged successively from the object side to the image side
Lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6, the 7th lens 7 and the 8th lens 8；
Each lens have its corresponding material, it may be possible to glass, it is also possible to which plastics, each lens have its corresponding
Shape, it may be possible to convex lens, it may be possible to which concavees lens, each lens have its corresponding focal power direction, may be positive, Ke Nengwei
It is negative, it is specific as follows for the first lens to the 8th lens：
First lens 1 and the 7th lens 7 are concave-convex negative power glass lens；
Second lens 2 and the 5th lens 5 are concave-convex negative power plastic lens；
The third lens 3 are concave-convex positive light coke glass lens；
4th lens 4 and the 8th lens 8 are concave-convex positive light coke plastic lens；
6th lens 6 are biconvex positive light coke glass lens.
Further include optical filter in Fig. 1, be set between the 8th lens and image space, user can be arranged according to the demand of itself
Can meet demand optical filter, so that tight shot is imaged according to the demand of user.
By above-mentioned reasonable combination glass lens and plastic lens, it can be achieved that large aperture, big target surface, high-resolution, reachable
The tight shot of 8000000 pixels, the tight shot image quality is good, and color difference is preferably corrected, and makes infrared not
Again it can also reach higher pixel under the premise of focusing, clearly bright monitoring picture is able to achieve under night low-light (level)
Face meets the requirement of monitoring camera day and night, while when the temperature difference is larger, will not run coke.
Lens can be spherical lens, be also possible to non-spherical lens, in order to further increase the aperture of tight shot
And improve tight shot resolution ratio, in the utility model embodiment, the second lens, the 4th lens, the 5th lens be and
8th lens are non-spherical lens, and other lens can be spherical lens.
Embodiment 3：
In the above-described embodiments, the focal length f2, the focal length f4 of the 4th lens, the focal length f5 of the 5th lens, the of the second lens
The focal length f8 of eight lens, can be any number, as long as meeting：0.61≤(f4*f8)/(f2*f5)≤0.69.In order to make
Image quality of the tight shot in the biggish environment of the temperature difference is more excellent, second focal length of lens f2=-80.13mm；Described
Four focal length of lens f4=64.54mm；5th focal length of lens f5=-13.98mm；8th focal length of lens f8=
11.30mm, wherein "-" indicates that the direction of focal length is negative.
It is available according to above-mentioned focal length：
(f4*f8)/(f2*f5)=(64.54*11.30)/(- 80.13*-13.98)=0.65, meets above-mentioned formula
0.61≤(f4*f8)/(f2*f5)≤0.69。
Embodiment 4：
On the basis of the various embodiments described above, in the present embodiment, the focal length of the 6th lens meets following formula：5mm≤
F6≤7mm, wherein f6 is the focal length of the 6th lens；The focal length f6 of 6th lens can be any number of the 5mm into 7mm, packet
5mm and 7mm are included, in order to keep the image quality of tight shot more excellent, the 6th focal length of lens f6=5.72mm.
On the basis of the above embodiments, in the present embodiment, each lens have its corresponding refractive index and abbe number,
The refractive index and abbe number of 4th lens, the refractive index and abbe number of the 5th lens meet following formula：0.063≤
(nd4/vd4)=(nd5/vd5)≤0.072, wherein nd4 is the refractive index of the 4th lens, and vd4 is the dispersion system of the 4th lens
Number, nd5 are the refractive index of the 5th lens, and vd5 is the abbe number of the 5th lens.
The refractive index nd4 of 4th lens, the abbe number vd4 of the 4th lens, the refractive index nd5 of the 5th lens, the 5th thoroughly
The abbe number vd5 of mirror, can be any number, be as long as meeting 0.063≤(nd4/vd4)=(nd5/vd5)≤0.072
Can, in order to keep the image quality of tight shot more excellent, the refractive index nd4=1.635518 of the 4th lens, the 4th lens
Abbe number vd4=23.971756；
The refractive index nd5=1.635518 of 5th lens, the abbe number vd5=23.971756 of the 5th lens.
It is available according to above-mentioned refractive index and abbe number：
Nd4/vd4=nd5/vd5=1.635518/23.971756=0.068 meets above-mentioned formula：0.063≤
(nd4/vd4)=(nd5/vd5)≤0.072.
Embodiment 5：
In order to keep the image quality of tight shot more excellent, the image quality especially at night is more excellent, in above-mentioned each reality
On the basis of applying example, in the utility model embodiment, the refractive index of the 6th lens meets：1.43≤nd6≤1.61, wherein
Nd6 is the refractive index of the 6th lens.
That is the refractive index of the 6th lens can be any number in 1.43 to 1.61, including 1.43 and 1.61,
More preferably, the 6th lens are refractive index nd6=1.437.
Embodiment 6：
In order to keep the image quality of tight shot more excellent, on the basis of the various embodiments described above, implement in the utility model
In example, the refractive index of the 8th lens meets：1.50≤nd8≤1.55, wherein nd8 is the refractive index of the 8th lens.
That is the refractive index of the 8th lens can be any number in 1.50 to 1.65, including 1.50 and 1.65,
More preferably, the 8th lens are refractive index nd8=1.535.
Embodiment 7：
On the basis of the various embodiments described above, in the utility model embodiment, second lens and the described 7th are thoroughly
The concave surface of mirror is towards object space；
First lens, the third lens, the 4th lens, the 5th lens, the 6th lens and institute
The convex surfaces of the 8th lens is stated towards object space.
In the utility model embodiment, the first lens into the 8th lens in addition to the 6th lens be biconvex lens, remaining
Lens be concave-convex lens, which is facing towards object space in the concave and convex surface of each lens, which is facing towards image space, specifically
It can be as shown in Figure 1：
First lens, 1 convex surface is towards object space, and concave surface is towards image space；
Second lens, 2 concave surface is towards object space, and convex surface is towards image space；
3 convex surface of the third lens is towards object space, and concave surface is towards image space；
4th lens, 4 convex surface is towards object space, and concave surface is towards image space；
5th lens, 5 convex surface is towards object space, and concave surface is towards image space；
6th lens, 6 one convex surface is towards object space, and another convex surface is towards image space；
7th lens, 7 concave surface is towards object space, and convex surface is towards image space；
8th lens, 8 convex surface is towards object space, and concave surface is towards image space.
Embodiment 8：
On the basis of the various embodiments described above, in the utility model embodiment, have between each lens and each lens
Fixed distance, the distance are the shortest distance of two adjacent lens；Specifically：
The distance between first lens and the second lens are 4.147856mm；
The distance between second lens and the third lens are 0.1mm；
The distance between the third lens and the 4th lens are 3.26928mm；
The distance between 4th lens and the 5th lens are 0.788133mm；
The distance between 5th lens and the 6th lens are 0.1mm；
The distance between 6th lens and the 7th lens are 0；
The distance between 7th lens and the 8th lens are 0.1mm.
In order to facilitate assembly, the 6th lens and the 7th lens group are at glued lens group.
Embodiment 9：
On the basis of the various embodiments described above, in the utility model embodiment, as shown in Figure 1, each lens have it
Corresponding two curved surfaces, i.e. concave surface and/or convex surface, the first lens 1 include curved surface (convex surface) 11 and curved surface (concave surface) 12, and second thoroughly
Mirror 2 includes curved surface (concave surface) 21 and curved surface (convex surface) 22, and the third lens 3 include curved surface (convex surface) 31 and curved surface (concave surface) 32, the
Four lens 4 include curved surface (convex surface) 41 and curved surface (concave surface) 42, and the first lens 5 include curved surface (convex surface) 51 and curved surface (concave surface)
52, the second lens 6 include curved surface (convex surface) 61 and curved surface (convex surface) 62, and the 7th lens 7 include that curved surface (concave surface) 71 and curved surface are (convex
Face) 72, the 8th lens 8 include curved surface (convex surface) 81 and curved surface (concave surface) 82.
Each curved surface has its corresponding radius of curvature R adius and each lens to have its corresponding thickness Thickness,
In addition to the focal length f, refractive index nd, abbe number vd of each lens of the various embodiments described above description, other lens also have its right
The various parameters information answered, i.e. focal length f, refractive index nd, abbe number vd information.Table 1 specific as follows：
Table 1
As shown in table 1, the "-" in radius of curvature indicates that radius of curvature direction is negative, and the "-" in focal length indicates focal length
Direction is negative, by taking the first lens as an example, in table 1, the first lens with a thickness of 0.55mm, refractive index 1.620047, dispersion
Coefficient is 36.34792, and focal length f is -8.146449mm, and the curvature half of curved surface (convex surface) 11 is 34.08644, and curved surface 12 is (recessed
Face) radius of curvature be 4.3721.
The corresponding parameter of other lens can be found in table 1, no longer be repeated herein.
Aperture diaphragm can also be set between the 4th lens and the 5th lens.
Description according to the above embodiments can have following optical technology to refer to the tight shot in the utility model
Mark：Optics overall length TTL is 30mm；Lens focus f ' is 5.3mm；The field angle of camera lens is 104 degree；The distortion of camera lens is -32%；
The aperture (F/#) of lens system is 1.60；Camera lens image planes are having a size of 1/1.8 〞.
Embodiment 10：
Fig. 2 is modulation transfer function of the tight shot provided by the embodiment of the utility model at 20 degrees Celsius
(Modulation Transfer Function, MTF) value schematic diagram, ordinate is mtf value.The Fig. 2 is based on parameter in table 1 and obtains
It arrives, camera lens most values the qualities such as resolution ratio, and mtf value is necessarily greater than 0, and less than 1, mtf value illustrates the performance of camera lens closer to 1
It is more excellent, i.e. high resolution；Its abscissa is spatial frequency, and spatial frequency is i.e. can show how many in the range of a mm
Line measures, and unit is indicated with lp/mm；Fixed high frequency (such as 160lp/mm) curve represents resolution of lens characteristic, this
Curve is higher, and resolution of lens is higher, and ordinate is mtf value.Fig. 3 is another form of MTF, and camera lens is centered on optical axis
Symmetrical structure, center to the pixel qualitative change law of all directions be it is identical, due to the influence of the factors such as aberration, in image field
Certain point is remoter at a distance from image field center, and mtf value is generally in downward trend.Therefore to take the photograph image field center to image field edge
Distance is abscissa, can reflect the imaging quality of lens edge.
In addition, in the position for deviateing image field center, by the sine of lines and lines radially along a tangential direction
Mtf value measured by grating is different.The MTF curve that the lines for being parallel to diameter generate is known as sagitta of arc curve, is designated as S
(Sagittal), and by the MTF curve that the lines for being parallel to tangent line generate it is known as meridian curve, is designated as T (Meridional).Such as
This one, MTF curve generally has two, i.e. S curve and T curve, in Fig. 2, Fig. 3, has multiple groups with image field center to image field edge
Distance MTF change curve when being abscissa, reflect that this lens system has compared with high resolution, up to eight mega pixel of 4K,
The more current mainstream optical system of optical property, which has, greatly to be promoted.
Monitoring camera is widely used in indoor and outdoor, and daily 24 hours 365 days 1 year in running order, locating for camera lens
Variation of ambient temperature is huge.The typical operating temperature requirements of monitoring camera are -30 DEG C~80 DEG C, and camera lens must assure that in this temperature difference
It is still clear with 20 DEG C (room temperature) to be imaged in the range of reaching more than 110 degrees Celsius, without re-focusing.
Since the refractive index of eyeglass material can be affected by temperature and change, lens dimension, lens barrel material, microscope base material
It can expand with heat and contract with cold with the variation of temperature, it is different that these factors cause common monitoring camera to will appear under high and low temperature environment
Burnt (rear cut-off distance), the referred to as temperature drift of lens imaging after imaging.
Fig. 4 is tight shot provided by the embodiment of the utility model mtf value schematic diagram at -30 degrees Celsius.
Fig. 5 is tight shot provided by the embodiment of the utility model mtf value schematic diagram at+80 degrees Celsius.
Found out by Fig. 4 and Fig. 5, at -30 DEG C~80 DEG C, the tight shot in the utility model still ensures that operating temperature
It is still clear with 20 DEG C (room temperature) to be imaged in the case where without re-focusing, and meets requirement.
The corresponding curvature of field figure of lens system visible light part is made of three curve T and three curve S；Wherein, three songs
Line T respectively indicates the aberration of the corresponding meridional beam (Tangential Rays) of three kinds of wavelength (486nm, 587nm and 656nm),
Three curve S respectively indicate the corresponding sagittal beam (Sagittial Rays) of three kinds of wavelength (486nm, 587nm and 656nm)
Aberration, meridianal curvature of field value and Sagittal field curvature value are smaller, illustrate that image quality is better.Curvature of field figure as shown in FIG. 6, meridianal curvature of field value
Within the scope of 35um, Sagittal field curvature value is controlled within 35um range for control.
Tight shot visible light part five different colours curves of corresponding aberration characteristic figure, respectively indicate three kinds of wavelength
The aberration of (486nm, 587nm and 656nm) corresponding light beam, curve illustrate that aberration is smaller closer to X-axis.Aberration as shown in Figure 7
Performance plot controls within the scope of -0.015~0.015mm.
The corresponding axial chromatic aberration figure of lens system visible light part, as shown in Figure 8.Curve changes near y-axis in figure, more
Close to y-axis, illustrate that lens system image quality is better.Its axial chromatic aberration controls between -0.02~+0.02mm.
The utility model embodiment discloses a kind of tight shot of glass modeling mixed structure, including：From the object side to the image side according to
The first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th of secondary arrangement
Lens；First lens and the 7th lens are concave-convex negative power glass lens；Second lens and the described 5th
Lens are concave-convex negative power plastic lens；The third lens are concave-convex positive light coke glass lens；4th lens and
8th lens are concave-convex positive light coke plastic lens；6th lens are biconvex positive light coke glass lens；Lens are full
Sufficient the following conditions：0.61≤(f4*f8)/(f2*f5)≤0.69, wherein f2 is the focal length of the second lens, and f4 is the 4th lens
Focal length, f5 are the focal length of the 5th lens, and f8 is the focal length of the 8th lens；5mm≤f6≤7mm, wherein f6 is the coke of the 6th lens
Away from；0.063≤(nd4/vd4)=(nd5/vd5)≤0.072, wherein nd4 is the refractive index of the 4th lens, and vd4 is the 4th saturating
The abbe number of mirror, nd5 are the refractive index of the 5th lens, and vd5 is the abbe number of the 5th lens.Pass through above-mentioned reasonable combination glass
Glass lens and plastic lens can be realized：Aperture is big, improves night even quality, meets the requirement of monitor camera day and night；
Level of resolution highest can satisfy the demand of the video camera of 8,000,000 pixels, and adaptability is wider；Target surface is big, can match 1/1.8 "
And following chip；Reasonable glass moulds mixed structure, corrects system color difference preferably, promotes daytime and night even matter
Amount, meets the requirement of monitor camera day and night, and take into account -30 degrees Celsius of requirements to 80 degree Celsius temperature ranges.
Although the preferred embodiment of the application has been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (14)
1. a kind of tight shot, which is characterized in that including：The first lens, the second lens, being arranged successively from the object side to the image side
Three lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens；
Second lens and the 5th lens are negative-power lenses, and the 4th lens and the 8th lens are positive light
Power lenses；
Lens meet the following conditions：
0.61≤(f4*f8)/(f2*f5)≤0.69, wherein f2 is the focal length of the second lens, and f4 is the focal length of the 4th lens, f5
For the focal length of the 5th lens, f8 is the focal length of the 8th lens.
2. tight shot as described in claim 1, which is characterized in that
First lens and the 7th lens are concave-convex negative power glass lens；
The third lens are concave-convex positive light coke glass lens；
6th lens are biconvex positive light coke glass lens.
3. tight shot as described in claim 1, which is characterized in that second lens, the 4th lens, the described 5th
Lens and the 8th lens are plastic lens.
4. tight shot as described in claim 1, which is characterized in that second lens, the 4th lens, the described 5th
Lens and the 8th lens are concave-convex non-spherical lens.
5. tight shot as described in claim 1, which is characterized in that second focal length of lens f2=-80.13mm；It is described
4th focal length of lens f4=64.54mm；5th focal length of lens f5=-13.98mm；8th focal length of lens f8=
11.30mm, wherein "-" indicates that direction is negative.
6. tight shot as described in claim 1, which is characterized in that lens also meet the following conditions：
5mm≤f6≤7mm, wherein f6 is the focal length of the 6th lens；
0.063≤(nd4/vd4)=(nd5/vd5)≤0.072, wherein nd4 is the refractive index of the 4th lens, and vd4 is the 4th saturating
The abbe number of mirror, nd5 are the refractive index of the 5th lens, and vd5 is the abbe number of the 5th lens.
7. tight shot as claimed in claim 6, which is characterized in that the 6th focal length of lens f6=5.72mm.
8. tight shot as claimed in claim 7, which is characterized in that the refractive index nd4=1.635518 of the 4th lens,
The abbe number vd4=23.971756 of 4th lens；
The refractive index nd5=1.635518 of 5th lens, the abbe number vd5=23.971756 of the 5th lens.
9. tight shot as described in claim 1, which is characterized in that 1.43≤nd6≤1.61, wherein nd6 is the 6th lens
Refractive index.
10. tight shot as claimed in claim 9, which is characterized in that the refractive index nd6=1.437 of the 6th lens.
11. tight shot as described in claim 1, which is characterized in that 1.50≤nd8≤1.55, wherein nd8 is the 8th saturating
The refractive index of mirror.
12. tight shot as claimed in claim 11, which is characterized in that the 8th index of refraction in lens nd8=1.535.
13. tight shot as claimed in claim 2, which is characterized in that the 6th lens and the 7th lens group plastic
Close lens group.
14. such as the described in any item tight shots of claim 1-13, which is characterized in that second lens and the described 7th are thoroughly
The concave surface of mirror is towards object space；
First lens, the third lens, the 4th lens, the 5th lens, the 6th lens and described
The convex surface of eight lens is towards object space.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820391616.XU CN208126004U (en) | 2018-03-22 | 2018-03-22 | A kind of tight shot |
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| CN201820391616.XU CN208126004U (en) | 2018-03-22 | 2018-03-22 | A kind of tight shot |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130288A (en) * | 2020-10-20 | 2020-12-25 | 东莞市宇瞳光学科技股份有限公司 | Black light lens |
| CN112433346A (en) * | 2020-12-10 | 2021-03-02 | 舜宇光学(中山)有限公司 | Large-aperture optical system |
| WO2021168662A1 (en) * | 2020-02-25 | 2021-09-02 | 天津欧菲光电有限公司 | Optical system, lens module, and terminal device |
| CN112433346B (en) * | 2020-12-10 | 2024-11-15 | 舜宇光学(中山)有限公司 | Large aperture optical system |
-
2018
- 2018-03-22 CN CN201820391616.XU patent/CN208126004U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021168662A1 (en) * | 2020-02-25 | 2021-09-02 | 天津欧菲光电有限公司 | Optical system, lens module, and terminal device |
| CN112130288A (en) * | 2020-10-20 | 2020-12-25 | 东莞市宇瞳光学科技股份有限公司 | Black light lens |
| CN112433346A (en) * | 2020-12-10 | 2021-03-02 | 舜宇光学(中山)有限公司 | Large-aperture optical system |
| CN112433346B (en) * | 2020-12-10 | 2024-11-15 | 舜宇光学(中山)有限公司 | Large aperture optical system |
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