CN110187484A - A kind of camera lens - Google Patents
A kind of camera lens Download PDFInfo
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- CN110187484A CN110187484A CN201910462919.5A CN201910462919A CN110187484A CN 110187484 A CN110187484 A CN 110187484A CN 201910462919 A CN201910462919 A CN 201910462919A CN 110187484 A CN110187484 A CN 110187484A
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- Prior art keywords
- lens
- lens group
- negative
- light
- camera lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length
Abstract
The invention discloses a kind of camera lens, the camera lens includes the first lens group being arranged successively by object side to image side, the second lens group, the third lens group, the 4th lens group and imaging surface；The position of first lens group and the third lens group is fixed, and the second lens group and the 4th lens group can be moved along optical axis；Lens group meets the following conditions: 10≤| f3/f short focus |≤17；4 < (TTL-D plate)/f focal length < 7；Wherein, f3 is the focal length of the third lens group, and f short focus is system focal length of the camera lens under short focus state, and f focal length is system focal length of the camera lens under focal length state, TTL is the optics overall length of the camera lens, and D plate is the distance between the 4th lens group and described imaging surface.Camera lens provided in an embodiment of the present invention increases camera lens target surface size and aperture, and image resolution ratio is higher, and the picture quality obtained under low-illumination scene is preferable, and reduces the optics overall length of camera lens.
Description
Technical field
The present invention relates to optical image technology field more particularly to a kind of camera lenses.
Background technique
With the development of society, the security precautions of people are continuously improved, safety monitoring industry also obtains high speed development,
It is also increasing to monitor the effect played.Zoom lens just has actual design in eighties of last century and uses, with lens design
The occasion of technology development, zoom lens application gradually increases.Nowadays, zoom lens is widely used to the product for civilian use, security protection prison
The fields such as control.But since zoom lens image quality is poorer than common fixed focus lens, so the use popularity rate of zoom lens
It is not high.And zoom lens major part structure now on the market is simple, and target surface size is smaller, leads to the image resolution ratio of acquisition
Lower, shooting effect is general, and picture value is little.And zoom lens major part aperture now on the market is smaller, leads to mirror
Head light transmission is less, the dark images obtained under low-illumination scene, it is difficult to guarantee picture quality.As security protection is to Gao Qinghua, small
Typeization promotes, and camera lens is needed to reach higher performance and smaller volume.Therefore develop that a small in size, target surface size is big, light
The zoom lens for enclosing big contour performance becomes particularly important.
Summary of the invention
It is smaller to solve camera lens target surface size in the prior art, aperture the embodiment of the invention provides a kind of camera lens,
And the larger problem of volume.
The embodiment of the invention provides a kind of camera lens, the camera lens includes the first lens being arranged successively by object side to image side
Group, the second lens group, the third lens group, the 4th lens group and imaging surface；
The position of first lens group and the third lens group is fixed, the second lens group and the 4th lens group can along optical axis into
Row movement；
Lens group meets the following conditions:
10≤| f3/f short focus |≤17；
4 < (TTL-D plate)/f focal length < 7；
Wherein, f3 is the focal length of the third lens group, and f short focus is system focal length of the camera lens under short focus state, f focal length
For system focal length of the camera lens under focal length state, TTL is the optics overall length of the camera lens, and D plate is the 4th lens
The distance between group and the imaging surface.
Further, first lens group include the first sub-lens group being arranged successively from the object side to image side, second just
Power lenses；
The first sub-lens group includes the first negative-power lenses and the first positive power lens.
Further, second lens group includes the second negative-power lenses being arranged successively from the object side to image side,
Three negative-power lenses, the second sub-lens group；
The second sub-lens group includes the 4th negative-power lenses and third positive power lens；
Second negative-power lenses are meniscus lens, and towards the surface of image side in second negative-power lenses
For concave surface.
Further, the third lens group includes the 4th positive power lens being arranged successively from the object side to image side,
Five negative-power lenses, third sub-lens group, the 7th positive power lens and the 7th negative-power lenses；
The third sub-lens group includes that the 5th positive power lens, the 6th negative-power lenses and the 6th positive light coke are saturating
Mirror；
4th positive power lens are biconvex lens；5th negative-power lenses are meniscus lens, and the described 5th
In negative-power lenses towards image side surface be convex surface；7th positive power lens are meniscus lens, and the 7th positive light
In power lenses towards image side surface be convex surface；7th negative-power lenses are meniscus lens, and the 7th negative power
In lens towards image side surface be concave surface.
Further, the refractive index of the 4th positive power lens and the 7th negative-power lenses is all larger than 1.9.
Further, the 4th lens group includes the 8th positive power lens being arranged successively from the object side to image side,
Four sub-lens groups；
The 4th sub-lens group includes the 8th negative-power lenses and the 9th positive power lens.
Further, vignetting stop is provided between second lens group and the third lens group；
Aperture diaphragm is provided between 5th negative-power lenses and the 5th positive power lens.
Further, first positive power lens, the 4th negative-power lenses, the 5th positive power lens and the 8th
The Abbe number of positive power lens is all larger than 60.
Further, the camera lens further includes light-dividing device, the light-dividing device be set to the 4th lens group and at
Between image planes；
The light-dividing device includes two prisms, and the joint surface of described two prisms is provided with the film with light splitting function
Layer, range belonging to the half-peak cut off wavelength of the film layer is 650 nanometers to 720 nanometers；The light emission side of each prism is distinguished
Equipped with corresponding imaging surface；
The angle in joint surface light entrance prism face corresponding with itself is more than or equal to 30 degree, and is less than or equal to 40
Degree；
The light that each joint surface is reflected is vertical with the imaging surface for receiving the light.
Further, it is equipped between each prism and corresponding imaging surface and protects glass for dust-proof imager chip
Glass.
Further, it receives and is equipped with transfer strip, the transfer strip between the imager chip protection glass of visible light and prism
For mobile in vertical optical axis direction, the transfer strip includes depolarized light ND filter disc and white balance filter disc.
The embodiment of the invention provides a kind of camera lens, the camera lens includes the first lens being arranged successively by object side to image side
Group, the second lens group, the third lens group, the 4th lens group and imaging surface；The position of first lens group and the third lens group
Fixed, the second lens group and the 4th lens group can be moved along optical axis；Lens group meets the following conditions: 10≤| f3/f short focus |
≤17；4 < (TTL-D plate)/f focal length < 7；Wherein, f3 is the focal length of the third lens group, and f short focus is the camera lens in short focus
System focal length under state, f focal length are system focal length of the camera lens under focal length state, and TTL is that the optics of the camera lens is total
Long, D plate is the distance between the 4th lens group and described imaging surface.Due in embodiments of the present invention, in camera lens
Four lens groups are arranged successively by object side to image side in particular order, and the lens group in camera lens meets: 10≤| f3/f
Short focus |≤17；The conditions such as 4 < (TTL-D plate)/f focal length < 7 increase camera lens target surface size and light to a certain extent
Circle, therefore the image resolution ratio acquired is higher, and the light transmission capacity of camera lens is still ensured that under low-illumination scene, so that obtain
Picture quality is preferable, and reduces the optics overall length of camera lens.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is camera lens schematic diagram provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram that the camera lens that the embodiment of the present invention 1 provides is in short focus state；
Fig. 3 is the structural schematic diagram that the camera lens that the embodiment of the present invention 1 provides is in focal length state；
Fig. 4 is transmission function (MTF) curve graph under short focus, white light conditions that the embodiment of the present invention 1 provides；
Fig. 5 is transmission function (MTF) curve graph in short focus, infrared 850nm that inventive embodiments 1 provide；
Fig. 6 is the system that provides of inventive embodiments 1 distortion figure under short focus state；
Fig. 7 is the system that provides of inventive embodiments 1 distortion figure under focal length state；
Fig. 8 is transmission function (MTF) curve graph under focal length, white light conditions that the embodiment of the present invention 1 provides；
Fig. 9 is transmission function (MTF) curve graph in focal length, infrared 850nm that the embodiment of the present invention 1 provides；
Figure 10 is the structural schematic diagram that the camera lens that the embodiment of the present invention 2 provides is in short focus state；
Figure 11 is the structural schematic diagram that the camera lens that the embodiment of the present invention 2 provides is in focal length state；
Figure 12 is transmission function (MTF) curve graph under short focus, white light conditions that the embodiment of the present invention 2 provides；
Figure 13 is transmission function (MTF) curve graph in short focus, infrared 850nm that inventive embodiments 2 provide；
Figure 14 is the system that provides of inventive embodiments 2 distortion figure under short focus state；
Figure 15 is the system that provides of inventive embodiments 2 distortion figure under focal length state；
Figure 16 is transmission function (MTF) curve graph under focal length, white light conditions that the embodiment of the present invention 2 provides；
Figure 17 is transmission function (MTF) curve graph in focal length, infrared 850nm that the embodiment of the present invention 2 provides.
Specific embodiment
The present invention will be describe below in further detail with reference to the accompanying drawings, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
All other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Fig. 1 is a kind of zoom lens schematic diagram that provides of the embodiment of the present invention 1, the zoom lens include: from object side to
The first lens group G1, the second lens group G2, the third lens group G3, the 4th lens group G4 and the imaging surface that image side is arranged successively.
The camera lens can realize zoom by changing the position of lens group, in the camera lens, the first lens group and third
The position of lens group is fixed, and the second lens group and the 4th lens group can carry out moving realization zoom along optical axis.Namely second thoroughly
Microscope group can be moved in the position between the first lens group and the third lens group.Second lens group can be close to first thoroughly
Microscope group, far from the third lens group；Away from the first lens group, close to the third lens group.4th lens group can be in third
It is moved in position between lens group and imaging surface.Second lens group is variable focus lens package, the movement pair of the second lens group
Lens focus influences big.4th lens group is compensation lens group, the fine tuning of the mobile realization focusing of the 4th lens group.Passing through will
Second lens group and the 4th lens group are set as can be along the lens group that optical axis is moved, to realize lens zoom.
Each lens group in camera lens provided in an embodiment of the present invention has its corresponding focal length f, and camera lens is under focal length state
There is its corresponding system focal length f focal length, there is its corresponding system focal length f short focus under short focus state.In order to provide a kind of big target
Face, large aperture, good imaging quality camera lens, the lens group meets following relationship:
10≤| f3/f short focus |≤17；
4 < (TTL-D plate)/f focal length < 7；
Wherein, f3 is the focal length of the third lens group, and f short focus is system focal length of the camera lens under short focus state, f focal length
For system focal length of the camera lens under focal length state, TTL is the optics overall length of the camera lens, and D plate is the 4th lens
The distance between group and the imaging surface.
Due in embodiments of the present invention, being arranged successively four thoroughly by object side to image side in particular order in camera lens
Microscope group, and the lens group in camera lens meets: 10≤| f3/f short focus |≤17；The conditions such as 4 < (TTL-D plate)/f focal length < 7,
To a certain extent, camera lens target surface size and aperture are increased, therefore the image resolution ratio acquired is higher, and in low-light (level) field
The light transmission capacity of camera lens is still ensured that under scape, so that the picture quality obtained is preferable, and reduces the optics overall length of camera lens.
General spheric glass light is easy to produce to the focal plane edge part Shi Qi than center portion after entering eyeglass
Serious refraction and bending, this phenomenon will lead to sharpness and contrast reduces and the generation of hot spot, so that picture quality
Decline.And such aberration is known as spherical aberration.In embodiments of the present invention, 10≤| f3/f short focus |≤17.| f3/f short focus |
It is worth too small, although lens length can be made to shorten, will increase spherical aberration, influence picture quality, and camera lens is made
The property made can reduce.And | f3/f short focus | value it is too big, although can reduce spherical aberration, that improves picture quality and camera lens can
Manufacturing, but lens length can be bigger.The spherical aberration and manufacturability of lens length and camera lens in order to balance, at this
Provide 10 in inventive embodiments≤| f3/f short focus |≤17 range can preferably take into account the ball of lens length and camera lens
Surface aberration and manufacturability.
Also, in order to further such that system can be compact, and reach higher imaging performance, in the embodiment of the present invention
In, 4 < (TTL-D plate)/f focal length < 7；Wherein, TTL is the optics overall length of the camera lens, and D plate is the 4th lens group
The distance between described imaging surface.
In order to further increase the image quality of camera lens, in embodiments of the present invention, first lens group includes from object
The first sub-lens group that side is arranged successively to image side, the second positive power lens 3, the first sub-lens group include the first negative power
Lens 1, the first positive power lens 2.In order to further such that system can be compact, first negative-power lenses 1 and
One positive power lens 2 glued can be connected or be fitted and connected.
Second lens group includes the second negative-power lenses 4 being arranged successively from the object side to image side, the negative light focus of third
Lens 5, the second sub-lens group are spent, the second sub-lens group includes the 4th negative-power lenses 6 and third positive power lens 7.For
Raising image quality, second negative-power lenses are meniscus lens, and in second negative-power lenses towards picture
The surface of side is concave surface.In order to further such that system can be compact, the 4th negative-power lenses and third positive light coke
Lens glued can be connected or be fitted and connected.
The third lens group includes the 4th positive power lens 8 being arranged successively from the object side to image side, the 5th negative light focus
Degree lens 9, third sub-lens group, the 7th positive power lens 13 and the 7th negative-power lenses 14, third sub-lens group include
5th positive power lens 10, the 6th negative-power lenses 11, the 6th positive power lens 12.In order to improve image quality, institute
Stating the 4th positive power lens is biconvex lens；5th negative-power lenses are meniscus lens, and the 5th negative power is saturating
In mirror towards image side surface be convex surface；7th positive power lens are meniscus lens, and in the 7th positive power lens
Surface towards image side is convex surface；7th negative-power lenses are meniscus lens, and direction in the 7th negative-power lenses
The surface of image side is concave surface.In order to further such that system can be compact, the 5th positive power lens, the 6th negative power
Lens and the 6th positive power lens glued can be connected or are fitted and connected.
4th lens group includes the 8th positive power lens 15, the 4th sub-lens being arranged successively from the object side to image side
Group, the 4th sub-lens group include the 8th negative-power lenses 16 and the 9th positive power lens 17.In order to further such that system
Can be compact, the 8th negative-power lenses and the 9th positive power lens glued can be connected or are fitted and connected.
In order to improve the refractive index of camera lens, reduce camera lens total length, in embodiments of the present invention, the 4th positive light coke
The refractive index nd of lens and the 7th negative-power lenses is all larger than 1.9.Such as the 4th positive power lens and the 7th negative power
The refractive index of lens can be the 2.0,2.1 etc., and the 4th positive power lens and the refractive index of the 7th negative-power lenses can
It can also be different with identical.Also, the refractive index of the 4th positive power lens and the 7th negative-power lenses is all larger than 1.9, also
Spherical aberration can be reduced, picture quality is improved.
In embodiments of the present invention, vignetting stop 18 is provided between second lens group and the third lens group；
Aperture diaphragm 19 is provided between 5th negative-power lenses and the 5th positive power lens.
Wherein, when vignetting stop is located at focal length state after the second lens group；It is saturating that aperture diaphragm is located closely adjacent to third
Between the 5th negative-power lenses and the 5th positive power lens before microscope group or in the third lens group.
When the vignetting stop is located at focal length state after the second lens group, can be intercepted here except 0 degree of visual field
With some light of optical axis side separate in the visual-field beam other than maximum field of view, contrasting for focal length end margin visual field can be eliminated
Degree declines suddenly and the dark angle problem of generation；Furthermore it is also possible to eliminate the light for being unfavorable for imaging performance in peripheral field and miscellaneous
Astigmatism can be obviously improved the peripheral field performance of complete burnt section；The caliber size of vignetting stop is close to 0 degree of visual field and maximum field of view
Peripheral light intersection when radial dimension (usually smaller than the bore of aperture diaphragm), position is fixed, preferable position
Setting scheme is to do small range along optical axis direction and move, and is unfavorable for the light of imaging performance and miscellaneous farthest to eliminate each burnt section
Astigmatism, caliber size can immobilize, and preferable scheme is to change with aperture diaphragm bore and change.
The caliber size of aperture diaphragm determines depth of field size when f-number and the shooting of system, and caliber size can
To immobilize, or the aperture diaphragm for placing calibre adjustable as needed has variable system to realize that clear aperture is adjustable
System f-number and the purpose for changing the depth of field.
In embodiments of the present invention, day and night confocal and without thermalization in order to be realized in the complete burnt section of camera lens, that is,-
40 degrees Celsius to 80 degrees Celsius can blur-free imaging, in embodiments of the present invention, first positive power lens, the 4th negative light
The equal Vd of Abbe number of power lenses, the 5th positive power lens and the 8th positive power lens is greater than 60.In addition, described first just
Power lenses, the 4th negative-power lenses, the 5th positive power lens and the 8th positive power lens Abbe number be all larger than
60, the color difference of image can also be reduced, to improve picture quality.For example, the first positive power lens, the 4th negative power are saturating
The Abbe number of mirror, the 5th positive power lens and the 8th positive power lens can be 65,68,70 etc..Also, the first positive light focus
The Abbe number for spending lens, the 4th negative-power lenses, the 5th positive power lens and the 8th positive power lens can be identical
It can be different.
In embodiments of the present invention, the camera lens further includes light-dividing device 20, and the light-dividing device is set to the described 4th
Between lens group and imaging surface；
The light-dividing device includes two prisms, and the joint surface of described two prisms is provided with the film with light splitting function
Layer, range belonging to the half-peak cut off wavelength of the film layer is 650 nanometers to 720 nanometers；The light emission side of each prism is distinguished
Equipped with corresponding imaging surface.
Visible light and infrared light are optimized respectively in order to realize, the camera lens further includes light-dividing device, light-dividing device
For the prism group being made of two prisms, the joint surface of two prisms is provided with the film layer with light splitting function, which can be with
According to user require be configured, such as can be reflection visible light-transmissive infrared light film layer, reflection infrared light it is visible
Film layer of light etc..Two prisms in prism group can be separately connected imager chip, such as complementary metal oxide semiconductor
(Complementary Metal Oxide Semiconductor, CMOS) chip etc..Imager chip receives visible light figure respectively
Then picture and infrared light image can will be seen that light image and infrared light image carry out fusion treatment by Image Fusion.
It may be implemented under low-light (level) environment, the weaker white light light filling of use, in conjunction with infrared light light filling appropriate, realize to scene in this way
Light filling, to guarantee fused picture quality.It avoids in the prior art using strong white light flashing light to driver or pedestrian
Caused dazzles the eyes sense.
The dichroic of prism group is the interface formed after two pieces of prism cementings, due to the two sides point of two pieces of prisms after gluing
The gap very little at interface, is usually regarded as single dichroic.It is coated on dichroic with 650~720nm (red wavelength range 620
~780nm) in certain wavelength be half-peak cut off (WHalf-peak, the wavelength of transmitance or reflectance peak half) film layer, preferably half
Peak ranges are 680~700nm.360~W is penetrated along the path AOBHalf-peakThe light of nm wave band, light enters the first imaging surface later
20.W is penetrated along the path AOCHalf-peakThe light of~1100nm wave band, light enters the second imaging surface 21 later.
It is equipped between each prism and corresponding imaging surface and protects glass 22 for dust-proof imager chip.Reception can
Transfer strip 23 is equipped between light-exposed imager chip protection glass and prism, the transfer strip is used to move in vertical optical axis direction
Dynamic, the transfer strip includes depolarized light ND filter disc and white balance filter disc.
Transfer strip is made of depolarized light ND filter disc and two class flat glass film of white balance filter disc, is moved in vertical optical axis direction
It is dynamic to realize switching.Wherein, the materials such as optics white glass or smalt can be used in white balance filter disc, and surface is equipped with balance color
Optical thin film.Depolarized light ND filter disc can eliminate white light usage scenario get off window shape at reflected light in polarization light,
The intensity for reducing reflected light can obviously improve the imaging effect of vehicle occupant and object.
In embodiments of the present invention, the angle in joint surface light entrance prism face corresponding with itself is more than or equal to 30
Degree, and it is less than or equal to 40 degree.
When the angle α in each joint surface light entrance prism face corresponding with itself is too small, prism institute reflection light has can
It can enter to the 4th lens group.Lead to not place imaging surface, the manufacturability of camera lens is poor.And if each joint surface with from
The angle α in body corresponding light entrance prism face is too big, and light reflectance, utilization rate can be made lower, so that brightness of image is low,
Influence the image quality of image.The manufacturability and image quality of camera lens in order to balance, connects the embodiment of the invention provides each
The range of the angle α in conjunction face light entrance prism face corresponding with itself, angle α is being more than or equal to 30 degree, and is less than or equal to 40
In the range of degree, the manufacturability and image quality of camera lens can preferably be taken into account.
In order to further increase light reflectance and utilization rate, avoid brightness of image lower, in embodiments of the present invention, often
The light that a joint surface is reflected is vertical with the imaging surface for receiving the light.
It is illustrated below for lens parameters provided in an embodiment of the present invention.
Embodiment 1:
The lens focus is 13~24.39mm, and aperture Fno is 1.42, and camera lens overall length TTL is 164.09mm.It is each
The data such as radius of curvature, center thickness, refractive index nd and the Abbe number Vd of mirror, as shown in table 1:
Table 1
D5, D12, D26, D31 are in wide-angle side W and focal length end T in table 1:
| D5 | D12 | D26 | D31 | |
| W | 1.06 | 16.12 | 3.67 | 2.54 |
| T | 17.05 | 0.12 | 1.80 | 4.42 |
Numerical value point when D32, D33, D34, D35 reach image planes 2 along the path AOB and reach image planes 1 along the path AOC in table 1
Not are as follows:
| D32 | D33 | D34 | D35 | |
| The path AOB | 24.95 | 3.82 | 0.55 | 3.16 |
| The path AOC | 25.5 | 7.03 | 0 | 0 |
Wherein, D32 represents the distance that light passes through in prism group along the path AOB or the path AOC, and D34 is that 0 representative is not put
Set the element.
According to the data and its ancillary data in table 1, can be obtained:
Nd8:2.003；Nd25:2.003；F3:204.16mm；fShort focus: 13.0mm；fFocal length: 24.39mm；Vd2:68.62；
Vd6:95.10；Vd10:95.10；Vd15:75.50；DPlate: 24.95+0.55+0.5=26mm or 25.5+0.5=26mm.
Camera lens is in structural schematic diagram such as Fig. 2 of short focus state, the structural schematic diagram of focal length state such as Fig. 3.When second thoroughly
When microscope group makees linear movement to 20 side of image planes, system focal length is elongated, and the field angle of camera lens becomes smaller therewith；4th lens group is adjoint
Nonlinear moving is made in the movement of second lens group, so that the position in blur-free imaging face remains stationary.
Detailed Optical system is carried out below by embodiment 1, is further described mirror provided by the present embodiment 1
Head.
Optical transfer function be for evaluating the mode that the image quality of an optical system is more accurate, intuitive and common,
Its curve is higher, more smooth, shows that the image quality of system is better, has carried out good correction to aberration.Fig. 4 is embodiment 1
Under short focus state, transmission function (MTF) curve graph under white light conditions, abscissa is resolution ratio, and unit lp/mm is indulged
Coordinate is MTF numerical value, and similar curve hereafter no longer repeats.As shown in figure 4, visible curve smoothly declines and concentrates.In 80lp/
Still ensure that mtf value is greater than 0.3 when mm.To realize system under white light, lens performance reaches the resolution of 7 mega pixels
Rate.
Fig. 5 is system under short focus state, transmission function (MTF) curve graph under infrared 850nm state, under curve smoothing
Drop and concentration.Still ensure that mtf value is greater than 0.3 in 80lp/mm, under whole and state of white light quite.Fig. 6, Fig. 7 are respectively
System is under short focus state, distortion figure under focal length state.Abscissa is percentage distortion numerical value, and ordinate is normalization numerical value, is taken
Being worth range is 0~1, represents the image height of 0~8.8mm.The absolute value of distortion number meets intelligent transportation identification image less than 10%
It is required that.Fig. 8, Fig. 9 are systems under focal length state, transmission function (MTF) curve graph under white light and infrared 850nm state.
Embodiment 2:
The lens focus is 13~24.41mm, and aperture Fno is 1.45, and camera lens overall length TTL is 164.75mm.It is each
The data such as radius of curvature, center thickness, refractive index nd and the Abbe number Vd of mirror, as shown in table 2:
Table 2
D5, D12, D26, D31 are in wide-angle side W and focal length end T in table 2:
| D5 | D12 | D13 | D26 | D31 |
| 1.02 | 18.50 | 26.73 | 3.58 | 2.47 |
| 17.93 | 0.10 | 28.23 | 1.57 | 4.49 |
The position D13 numerical value change of vignetting stop indicates: vignetting stop is moved in a small range along optical axis, so as to maximum journey
Eliminate the light for being unfavorable for imaging in degree ground.
Numerical value point when D32, D33, D34, D35 reach image planes 2 along the path AOB and reach image planes 1 along the path AOC in table 2
Not are as follows:
| D32 | D33 | D34 | D35 | |
| The path AOB | 27.95 | 3.25 | 0.55 | 2.75 |
| The path AOC | 28.5 | 8.25 | 0 | 0 |
Wherein, D32 represents the distance that light passes through in prism group along the path AOB or the path AOC, and D34 is that 0 representative is not put
Set the element.
It is available according to the data in table 2:
Nd8:1.946；Nd25:2.003；F3:179.12mm；fShort focus: 13.0mm；fFocal length: 24.41mm；Vd2:68.62；
Vd6:95.10；Vd10:95.10；Vd15:75.50；DPlate: 27.95+0.55+0.5=29mm or 28.5+0.5=29mm.
Camera lens is in structural schematic diagram such as Figure 10 of short focus state, the structural schematic diagram of focal length state such as Figure 11.
Detailed Optical system is carried out below by embodiment 2, is further described mirror provided by the present embodiment 2
Head.Figure 12 is embodiment 2 under short focus state, white light transmission function (MTF) curve graph, curve smoothing decline and concentration.?
Still ensure that mtf value is greater than 0.3 when 80lp/mm.To realize system under white light, the resolution of 7 mega pixel of lens performance
Rate.Figure 13 is embodiment 2 under short focus state, transmission function (MTF) curve graph when infrared 850nm, curve smoothing decline and
It concentrates.Still ensure that mtf value is greater than 0.3 in 80lp/mm, numerical requirements are more slightly lower than state of white light, whole suitable.Figure 14,
Figure 15 is the distortion figure under short focus state, focal length state of embodiment 2 respectively.Abscissa is percentage distortion numerical value, and ordinate is
Numerical value is normalized, value range is 0~1, represents the image height of 0~8.8mm.The absolute of numerical value that distort meets intelligence friendship less than 10%
The requirement of logical identification image.Figure 16, Figure 17 are transmitting of the embodiment 2 under the focal length of focal length end, under white light and infrared 850nm state
Function (MTF) curve graph.
The optical property that this camera lens is realized is as follows: zoom ratio is about 1.9；Focal range is 13~25mm, and aperture Fno is
1.40~1.45,2 ω range of field angle is 39~73 degree, and image planes size y ' is(target surface is 1.1 "), camera lens overall length
TTL is less than 165mm；It realizes a kind of high-resolution, wide-angle large aperture zoom, without technical requirements such as thermalizations, and is applicable in road and hands over
The logical monitoring requirement to lane.
In conclusion using 4 group 17 and containing prism the embodiment of the invention provides a kind of intelligent transportation zoom lens
The optical lens of group, and be from left to right arranged successively according to particular order, and point of the focal power by each optical lens
Match, while using reasonable optical glass material, so that the structure type of lens system, refractive index, Abbe number of lens etc.
Parameter is matched with image-forming condition, and then obtains the spherical aberration of lens system, coma, astigmatism, the curvature of field, ratio chromatism, chromatism of position
Correction well, thus reach the resolution ratio of super large aperture, ten million pixel, good environment applicability (from -40 degree to 80 degree).It adopts
It is imaged respectively in two imager chips with two waveband, using the processing of algorithm, carries out image co-registration, realize image effect
Fruit；And compact-sized, outer dimension is small, and all optical lenses are all made of spherical design, and cold machining process is functional, raw
It produces at low cost.By prism group by image formed by different-waveband, received respectively by two pieces of imager chips (such as CMOS), then
By algorithm it will be seen that light provides colour and luminance information, the provided luminance information of infrared light are fused together, may be implemented low
According under environment, the weaker white light light filling of use and infrared light light filling appropriate can eliminate the existing sudden and violent flashing light of strong white light used
Dazzle the eyes sense, temporary visual discomfort to answer caused by drivers and pedestrians to driving, substantially increases traffic safety.?
In intelligent transportation field, using the final image effect of this scheme flashing light sudden and violent with strong white light used in existing road traffic without bright
Significant difference is other.
The embodiment of the invention provides a kind of camera lens, the camera lens includes the first lens being arranged successively by object side to image side
Group, the second lens group, the third lens group, the 4th lens group and imaging surface；The position of first lens group and the third lens group
Fixed, the second lens group and the 4th lens group can be moved along optical axis；Lens group meets the following conditions: 10≤| f3/f short focus |
≤17；4 < (TTL-D plate)/f focal length < 7；Wherein, f3 is the focal length of the third lens group, and f short focus is the camera lens in short focus
System focal length under state, f focal length are system focal length of the camera lens under focal length state, and TTL is that the optics of the camera lens is total
Long, D plate is the distance between the 4th lens group and described imaging surface.Due in embodiments of the present invention, in camera lens
Four lens groups are arranged successively by object side to image side in particular order, and the lens group in camera lens meets: 10≤| f3/f
Short focus |≤17；The conditions such as 4 < (TTL-D plate)/f focal length < 7 increase camera lens target surface size and light to a certain extent
Circle, therefore the image resolution ratio acquired is higher, and the light transmission capacity of camera lens is still ensured that under low-illumination scene, so that obtain
Picture quality is preferable, and reduces the optics overall length of camera lens.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may 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 scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of camera lens, which is characterized in that the camera lens include the first lens group being arranged successively by object side to image side, second thoroughly
Microscope group, the third lens group, the 4th lens group and imaging surface；
The position of first lens group and the third lens group is fixed, and the second lens group and the 4th lens group can be moved along optical axis
It is dynamic；
Lens group meets the following conditions:
10≤| f3/f short focus |≤17；
4 < (TTL-D plate)/f focal length < 7；
Wherein, f3 is the focal length of the third lens group, and f short focus is system focal length of the camera lens under short focus state, and f focal length is institute
State system focal length of the camera lens under focal length state, TTL is the optics overall length of the camera lens, D plate be the 4th lens group with
The distance between described imaging surface.
2. camera lens as described in claim 1, which is characterized in that first lens group includes being arranged successively from the object side to image side
The first sub-lens group, the second positive power lens；
The first sub-lens group includes the first negative-power lenses and the first positive power lens.
3. camera lens as claimed in claim 2, which is characterized in that second lens group includes being arranged successively from the object side to image side
The second negative-power lenses, third negative-power lenses, the second sub-lens group；
The second sub-lens group includes the 4th negative-power lenses and third positive power lens；
Second negative-power lenses are meniscus lens, and are recessed towards the surface of image side in second negative-power lenses
Face.
4. camera lens as claimed in claim 3, which is characterized in that the third lens group includes being arranged successively from the object side to image side
The 4th positive power lens, the 5th negative-power lenses, third sub-lens group, the 7th positive power lens and the 7th negative light focus
Spend lens；
The third sub-lens group includes the 5th positive power lens, the 6th negative-power lenses and the 6th positive power lens；
4th positive power lens are biconvex lens；5th negative-power lenses are meniscus lens, and the 5th negative light
In power lenses towards image side surface be convex surface；7th positive power lens are meniscus lens, and the 7th positive light coke
In lens towards image side surface be convex surface；7th negative-power lenses are meniscus lens, and the 7th negative-power lenses
The middle surface towards image side is concave surface.
5. camera lens as claimed in claim 4, which is characterized in that the 4th positive power lens and the 7th negative-power lenses
Refractive index be all larger than 1.9.
6. camera lens as claimed in claim 4, which is characterized in that the 4th lens group includes being arranged successively from the object side to image side
The 8th positive power lens, the 4th sub-lens group；
The 4th sub-lens group includes the 8th negative-power lenses and the 9th positive power lens.
7. camera lens as claimed in claim 4, which is characterized in that be arranged between second lens group and the third lens group
There is vignetting stop；
Aperture diaphragm is provided between 5th negative-power lenses and the 5th positive power lens.
8. camera lens as claimed in claim 6, which is characterized in that first positive power lens, the 4th negative-power lenses,
The Abbe number of 5th positive power lens and the 8th positive power lens is all larger than 60.
9. camera lens as described in claim 1, which is characterized in that the camera lens further includes light-dividing device, and the light-dividing device is set
It is placed between the 4th lens group and imaging surface；
The light-dividing device includes two prisms, and the joint surface of described two prisms is provided with the film layer with light splitting function, institute
Stating range belonging to the half-peak cut off wavelength of film layer is 650 nanometers to 720 nanometers；The light emission side of each prism is respectively equipped with pair
The imaging surface answered；
The angle in joint surface light entrance prism face corresponding with itself is more than or equal to 30 degree, and is less than or equal to 40 degree；
The light that each joint surface is reflected is vertical with the imaging surface for receiving the light.
10. camera lens as claimed in claim 9, which is characterized in that be equipped with and use between each prism and corresponding imaging surface
Glass is protected in dust-proof imager chip.
11. camera lens as claimed in claim 10, which is characterized in that receive visible light imager chip protection glass and prism it
Between be equipped with transfer strip, the transfer strip be used for it is mobile in vertical optical axis direction, the transfer strip include depolarized light ND filter disc and
White balance filter disc.
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| CN110764237A (en) * | 2019-11-27 | 2020-02-07 | 浙江大华技术股份有限公司 | Lens |
| CN111781717A (en) * | 2020-07-22 | 2020-10-16 | 浙江大华技术股份有限公司 | Lens |
| CN112882208A (en) * | 2019-11-29 | 2021-06-01 | 上海微电子装备（集团）股份有限公司 | Large-field-of-view imaging objective lens |
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| WO2023108982A1 (en) * | 2021-12-16 | 2023-06-22 | 重庆西山科技股份有限公司 | Polarized light endoscope device, camera, and camera optical system |
| CN116577919A (en) * | 2023-07-06 | 2023-08-11 | 苏州东方克洛托光电技术有限公司 | Zoom lens with racemization prism |
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