CN109031587A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN109031587A CN109031587A CN201710433514.XA CN201710433514A CN109031587A CN 109031587 A CN109031587 A CN 109031587A CN 201710433514 A CN201710433514 A CN 201710433514A CN 109031587 A CN109031587 A CN 109031587A
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- lens
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- optical lens
- focal length
- image side
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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
- G02B13/004—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 four lenses
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The present invention provides optical lens.The optical lens successively includes: the first lens from the object side to image side, and for the meniscus shaped lens with positive light coke, object side is convex surface, image side surface is concave surface；Second lens, for the meniscus shaped lens with negative power, object side is convex surface, image side surface is concave surface；The third lens, for the meniscus shaped lens with positive light coke, object side is concave surface, image side surface is convex surface；With the 4th lens, for the lens with positive light coke, object side is convex surface.Optical lens provided by the invention can realize that height enters light quantity while keeping camera lens miniaturization by the shape and each power of lens of reasonable distribution of each lens of optimal setting.
Description
Technical field
The present invention relates to the fields of optical lens, realize that height enters light in particular to while keeping camera lens miniaturization
The optical lens of amount and small distortion.
Background technique
Laser radar is the radar system to emit the characteristic quantities such as the position of detecting laser beam target, speed.It is former from work
Said in reason, laser radar is identical as microwave radar, be all to objective emission detectable signal (laser beam), then will receive from
The reflected signal of target (target echo) is compared with transmitting signal, after making proper treatment, so that it may which obtain target has
Information, such as target range, orientation, height, speed, posture, even shape parameter are closed, to be detected, be tracked to target
And identification.
Laser radar generally includes the component parts such as laser emitter, optical receiver, turntable and information processing system, swashs
Electric pulse is become light pulse emission and gone out by optical transmitting set, and optical receiver from the reflected light pulse of target again being reduced into
Electric pulse is sent to display and shows.
With unpiloted development, laser radar, which becomes, realizes unpiloted important equipment, it is received by analysis
To reflection laser come the relevant information, such as position, speed etc. that determine obstructing objects.Optical lens is the important of laser radar
Component part then needs as described above, the transmitting terminal in laser radar needs to carry out collimated light beam using optical lens in its receiving end
Optical lens is wanted to receive light beam.
Therefore, used laser radar needs to equip two class camera lenses currently on the market, and one kind is transmitting terminal camera lens, Yi Leishi
Receiving end camera lens.
Different from common lens, the receiving end camera lens of laser radar not hoped for success picture, but need to collect as much as possible
Reflected light enables the chip at rear to receive the most energy of reflected light.So the receiving end camera lens of laser radar is wanted
It asks FNO small, enables camera lens to receive more light, while the requirement to distortion is also very high.
And it is further desired that keeping the miniaturization of camera lens.
Accordingly, there exist the needs for improved optical lens and laser radar.
Summary of the invention
It is an object of the invention to be directed to above-mentioned defect in the prior art and deficiency, provide it is novel and it is improved can
Realize that height enters the optical lens and laser radar of light quantity and small distortion while keeping camera lens miniaturization.
It is an object of the present invention to provide a kind of optical lens and laser radars, pass through each lens of optimal setting
Shape and each power of lens of reasonable distribution can realize that height enters light quantity while keeping camera lens miniaturization.
It is an object of the present invention to provide a kind of optical lens and laser radars, use positive light focus by the first lens
The meniscus shaped lens of degree can collect more light and enter optical system, to realize that height enters light quantity.
It is an object of the present invention to provide a kind of optical lens and laser radars, use falcate by the first lens
Shape can effectively reduce the bore and the distance between the first lens and the second lens of the second lens, help to realize light
Learn the miniaturization of camera lens.
It is an object of the present invention to provide a kind of optical lens and laser radars, pass through the shape and light of the second lens
Focal power setting may be implemented the smooth transition of light, and reduce the aberration generated by the first lens.
It is an object of the present invention to provide a kind of optical lens and laser radars, pass through the shape and light of the third lens
Focal power setting can further decrease the aberration that the first lens and the second lens generate, and help to adjust imaging size.
It is an object of the present invention to provide a kind of optical lens and laser radar, the object side by the 4th lens is
Convex surface, helps to collect the emergent ray from the third lens and converges to chip.
It is an object of the present invention to provide a kind of optical lens and laser radars, by the way that the second lens and third are saturating
Mirror is set as that bore is roughly the same, and the cost of optical lens can be effectively reduced.
It is an object of the present invention to provide a kind of optical lens and laser radars, by the way that the second lens and third are saturating
Mirror is set as non-spherical lens, can control disc of confusion size and distortion size and provides excellent optical property.
It is an object of the present invention to provide a kind of optical lens and laser radars, by the way that the second lens and third are saturating
Mirror is set as glass aspheric lenses, and good thermal stability may be implemented.
It is an object of the present invention to provide a kind of optical lens and laser radars, by the way that the second lens and third are saturating
Mirror is set as the almost the same plastic aspheric lens of material/shape, and defocus when can be changed with compensation temperature is changed and promoted
Thermal stability realizes that the small height of fluctuation range enters light quantity.
It is an object of the present invention to provide a kind of optical lens and laser radars, by the way that the second lens and third are saturating
Mirror is set as substantially symmetric close to concentric circles, can effectively correct distortion, guarantee small distortion.
It is an object of the present invention to provide a kind of optical lens and laser radars, by the way that the second lens and third are saturating
Mirror is disposed proximate to the glass lens of concentric circles, is conducive to the processing of eyeglass, realizes the low cost of optical lens.
It is an object of the present invention to provide a kind of optical lens and laser radars, by providing the big aperture of the diaphragm,
More reflection lights can be received.
It is an object of the present invention to provide a kind of optical lens and laser radars, by the way that the first lens and the 4th are saturating
The focal length of mirror is arranged greatly, and is arranged small by the focal length of the second lens and the third lens, can make the energy into camera lens
Height to realize that height enters light quantity, and obtains big field angle.
It is an object of the present invention to provide a kind of optical lens and laser radars, pass through the first lens of setting to the 4th
The refractive index and Abbe number of lens help to realize gentle transition of the light in entire optical system, enter to obtain height
Light quantity and big field angle.
According to an aspect of the present invention, a kind of optical lens is provided, from the object side to image side successively includes: the first lens,
It is the meniscus shaped lens with positive light coke, the object side of first lens is convex surface, and image side surface is concave surface；Second lens,
It is the meniscus shaped lens with negative power, the object side of second lens is convex surface, and image side surface is concave surface；The third lens,
It is the meniscus shaped lens with positive light coke, the object side of the third lens is concave surface, and image side surface is convex surface；With, the
Four lens are the lens with positive light coke, and the object side of the 4th lens is convex surface.It is described in above-mentioned optical lens
The image side surface of 4th lens is that the image side surface of plane or the 4th lens is concave surface.
In above-mentioned optical lens, second lens and a third lens at least non-spherical lens.
In above-mentioned optical lens, second lens and the third lens have the shape close to concentric circles.
In above-mentioned optical lens, second lens and the third lens are glass lens.
In above-mentioned optical lens, further comprise: big aperture diaphragm is located at second lens and the third is saturating
Between mirror.
In above-mentioned optical lens, first lens meet the following conditions expression formula (1) to the 4th lens:
TTL/F≤1.6(1)
Wherein, F is the whole group focal length value of the optical lens, and TTL is the optical length of the optical lens.
In above-mentioned optical lens, the focal length of first lens to the 4th lens meets the following conditions expression formula
(2):
F1/F≤1.6(2)
Wherein, F1 is the focal length of first lens, and F is the whole group focal length value of the optical lens.
In above-mentioned optical lens, the focal length of first lens to the 4th lens meets the following conditions expression formula
(3):
Shu >=4 Shu F2/F (3)
Wherein, F2 is the focal length of second lens, and F is the whole group focal length value of the optical lens.
In above-mentioned optical lens, the focal length of first lens to the 4th lens meets the following conditions expression formula
(4):
F3/F≥12 (4)
Wherein, F3 is the focal length of the third lens, and F is the whole group focal length value of the optical lens.
In above-mentioned optical lens, the focal length of first lens to the 4th lens meets the following conditions expression formula
(5):
F4/F≤1.4 (5)
Wherein, F4 is the focal length of the 4th lens, and F is the whole group focal length value of the optical lens.
In above-mentioned optical lens, second lens meet the following conditions expression formula (6):
0.5≤(R4+d3)/R3≤1.5 (6)
Wherein, R3 is the radius of curvature of the object side of second lens, and R4 is the song of the image side surface of second lens
Rate radius, d3 are the thickness of second lens.
In above-mentioned optical lens, the third lens meet the following conditions expression formula (7):
0.5≤(Shu R6 Shu+d6)/Shu≤1.5 Shu R7 (7)
Wherein, R6 is the radius of curvature of the object side of the third lens, and R7 is the song of the image side surface of the third lens
Rate radius, and d6 is the thickness of the third lens.
According to another aspect of the present invention, a kind of laser radar is provided, including above-mentioned optical lens as receiving end
Camera lens.
Optical lens and laser radar provided by the invention, it is each by the shape and reasonable distribution of each lens of optimal setting
A power of lens can realize that height enters light quantity while keeping camera lens miniaturization.
Detailed description of the invention
Fig. 1 illustrates the lens configuration of optical lens according to a first embodiment of the present invention；
The lens configuration of the optical lens of Fig. 2 diagram according to a second embodiment of the present invention；
Fig. 3 is the schematic block diagram of laser radar according to an embodiment of the present invention.
Specific embodiment
It is described below for the open present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.It defines in the following description
Basic principle of the invention can be applied to other embodiments, deformation scheme, improvement project, equivalent program and do not carry on the back
Other technologies scheme from the spirit and scope of the present invention.
Term used in following description and claim and word are not limited to literal meaning, but only by the present inventor
The present invention can be understood and consistently understand by being used so that.Therefore, to those skilled in the art clearly only for explanation
Purpose rather than provide this hair for the limitation purpose of the present invention as defined in appended claims and their equivalent
Bright various embodiments are described below.
Term used herein is only used for describing the purpose of various embodiments and is not intended to limit.As used herein,
Singular is intended to also include plural form, makes an exception unless the context clearly dictates.Will further be understood that term " includes " and/or
" having " specifies depositing for the feature, number, step, operation, component, element or combinations thereof when being used in this specification
, and it is not excluded for the presence or additional of one or more of the other feature, number, step, operation, component, element or its group.
Term used herein including technical and scientific term has and the normally understood art of those skilled in the art
The identical meaning of language, only if it were not for being defined differently than the term.It should be understood that the term tool limited in usually used dictionary
Have and the consistent meaning of the meaning of term in the prior art.
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[configuration of optical lens]
One side according to an embodiment of the present invention provides a kind of optical lens, from the object side to image side successively includes: first
Lens, for the meniscus shaped lens with positive light coke, object side is convex surface, image side surface is concave surface；Second lens, for negative
The meniscus shaped lens of focal power, object side is convex surface, image side surface is concave surface；The third lens, for the bent moon with positive light coke
Shape lens, object side is concave surface, image side surface is convex surface；With the 4th lens, for the lens with positive light coke, object side is
Convex surface.
In optical lens according to an embodiment of the present invention, the meniscus shaped lens of positive light coke is used by the first lens,
Incident ray incidence angle on the face of meeting head-on can be made small, to collect light in visual field as much as possible, be conducive to collect more
Light enters optical system, to realize that height enters light quantity, to meet the demand of the receiving end camera lens of laser radar.Also, due to
First lens use meniscus shape, can effectively reduce between the bore and the first lens and the second lens of the second lens
Distance helps to realize the miniaturization of optical lens.
Because the first lens of optical lens are convergent lens, it is arranged using the focal length of the second lens so that light is walked
Gesture is relatively gentle, so that light smooth transition is to rear.Here, by setting the focal length of the second lens to much larger than the
The gentle tendency of above-mentioned light may be implemented in one lens, this will be described in details further below.
In addition, the third lens are the meniscus shaped lens for concaving towards object side, object side is concave surface, and image side surface is convex surface.This
Three lens are convergent lens, so that smoothly entering rear by the light of the diverging after the second lens, are conducive to reduce the 4th
The bore of lens.Also, by the shape of the third lens and focal power setting, be conducive to shorten optical system overall length.Above-mentioned
In optical lens, the image side surface of the 4th lens is that the image side surface of plane or the 4th lens is concave surface.
Preferably, in above-mentioned optical lens, the second lens and the third lens are non-spherical lens.
It is non-spherical lens by the second lens and the third lens, facilitates through control disc of confusion size and distortion size
And improve optical property.That is, optical lens according to an embodiment of the present invention enspheres energy (Encircled
Energy) high, that is, by disc of confusion size strict control, so that disc of confusion is small, hence into the light ray energy of optical system
It is received to greatest extent by single pixel.Here, when disc of confusion refers to objective point imaging, due to aberration, imaging beam cannot can
It gathers at one point, and the circular projection of formed on as plane a diffusion.Preferably, optical frames according to an embodiment of the present invention
The energy that enspheres of head reaches 95% or more, and in the case where temperature change, and fluctuation range is stablized below 5%.
In addition, the CRA of optical lens according to an embodiment of the present invention, i.e., the chief ray and picture being emitted from last piece of eyeglass
Face normal forms angle very little, small so as to guarantee that disc of confusion is changed in the case where depth of focus (DOF) is very big, makes under big DOF
Disc of confusion in pixel size.Here, depth of focus refer to camera lens as plane both sides imaging clearly range.
In above-mentioned optical lens, the second lens and the third lens can be glass aspheric lenses.By using glass
Non-spherical lens is conducive to camera lens thermal compensation, but higher cost.Also, when saturating using Glass aspheric with a high refractive index
When mirror, it can further be conducive to reduce optical lens volume in the radial direction.
Alternatively, the second lens and the third lens are plastic aspheric lens.In this way, by using plastic aspheric lens,
The manufacturing cost of optical lens can be reduced.But since the temperature performance of plastic lens is poor, it is preferable that the second lens and
Material/shape of the third lens is almost the same, to help to improve thermal stability.In this way, in temperature change, defocus variation
It can cancel out each other, for example, optical lens according to an embodiment of the present invention enspheres the wave of energy within the scope of -40 DEG C~85 DEG C
Dynamic range is below 5%.
Preferably, in above-mentioned optical lens, the second lens and the third lens have the shape close to concentric circles.More preferably
Ground, the second lens and the third lens are symmetrical concentric circles.In this way, optical lens according to an embodiment of the present invention passes through
Using two concentric circle lens, distortion can be effectively corrected, guarantees that distortion is small, for example, within 1%.
Also, the second lens and the third lens are preferably glass lens, to be conducive to the processing of eyeglass, realize optics
The low cost of camera lens.
It preferably, further comprise the big aperture of the diaphragm in above-mentioned optical lens, to promote to realize small FNO.This
Sample can receive more reflection lights, in this way by the big aperture of the diaphragm, it is necessary to realize light in entire optical lens
Smooth transition.This needs to realize by the setting of the focal length F of the first lens to the 4th lens, specifically, head and the tail two
Lens are required to effectively collapse light angle, so the F of the first lens and the 4th lens small, and intermediate lens need reality
The smooth transition of existing light, so the second lens and the F of the third lens are big.
Preferably, the aperture diaphragm is between the second lens and the third lens, to be conducive into optical system
Light effectively collects, and reduces the eyeglass bore of optical system.Certainly, it will be understood by those skilled in the art that diaphragm can also position
Between other any lens.
More specifically, the second lens are the meniscus shaped lens for being convex to object space, have big focal length F, make light smooth transition
To diaphragm and then to rear optical system, also, the second lens can reduce the aberration generated by the first lens, play steadily mistake
Cross effect of light.The third lens are the meniscus shaped lens for being convex to image space, can be further reduced the first lens and the second lens
The aberration of generation, and help to adjust imaging size.Furthermore it is preferred that making the second lens and the bore of the third lens substantially
It is identical, to be effectively reduced cost.
Also, the object side of the 4th lens is convex surface, helps to collect the light from L3 outgoing and converges to chip, and
And the 4th the F of lens equally want small.
Preferably, in above-mentioned optical lens, the first lens meet the following conditions expression formula (1) to the 4th lens:
TTL/F≤1.6 (1)
Wherein, F is the whole group focal length value of optical lens, and TTL is the optical length of optical lens, i.e. the object of the first lens
Distance of the side outermost point to imaging focal plane.
In this way, being arranged by the first lens to the 4th power of lens and shape, the small-sized of optical lens may be implemented
Change.
Preferably, in above-mentioned optical lens, the focal length F1 of the first lens, the focal length F2 of the second lens, the third lens
The focal length F4 of focal length F3 and the 4th lens meets the following conditions expression formula (2)-(5) respectively:
F1/F≤1.6 (2)
Shu >=4 Shu F2/F (3)
F3/F≥12 (4)
F4/F≤1.4 (5)
In this way, as described above, by the way that the focal length of the first lens and the 4th lens to be arranged greatly, and by the second lens and
The focal length of three lens is arranged small, and the energy into camera lens can be made high, to realize that height enters light quantity, and obtain big view
Rink corner, for example, 30 °~48 °.
It will be understood by those skilled in the art that above-mentioned condition expression formula (2)-(5) are coordination and therebetween not
Be mutually related relationship.That is, can only meet conditional expression in optical lens according to an embodiment of the present invention
(2) one or more of-(5) can also all meet above-mentioned condition expression formula (2)-(5).
Preferably, in above-mentioned optical lens, the second lens and the third lens meet respectively the following conditions expression formula (6) and
(7):
0.5≤(R4+d3)/R3≤1.5 (6)
0.5≤(Shu R6 Shu+d6)/Shu≤1.5 Shu R7 (7)
Wherein, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side surface of the second lens, d3
It is the center thickness of the second lens, R6 is the radius of curvature of the object side of the third lens, and R7 is the song of the image side surface of the third lens
Rate radius, d6 are the center thickness of the third lens.
Equally, conditional expression (6) and (7) are also coordination and the relationship that is not mutually related therebetween here.
That is, can only meet one of conditional expression (6) and (7) in optical lens according to an embodiment of the present invention, or
It can satisfy both conditional expression (6) and (7).
In this way, can effectively be guaranteed small by the setting of the second lens and the symmetrical concentric circles of the third lens
Distortion, such as within 1%.
Also, in optical lens according to an embodiment of the present invention, the refractive index Nd of the first lens and the 4th lens and Ah
Shellfish coefficient Vd preferably meets: Nd >=1.7 and Vd≤55.Also, the refractive index Nd and Abbe system of the second lens and the third lens
Number Vd preferably meets: Nd≤1.6 and Vd >=23.
In addition, it will be understood by those skilled in the art that optical lens according to an embodiment of the present invention is in addition to may be used as swashing
Except the receiving end camera lens of optical radar, also can be applied to it is other need to realize that height enters light quantity and small distortion, and meet miniaturization
The optical lens of demand.Therefore, it is not intended to for optical lens according to an embodiment of the present invention to be only limitted to the reception of laser radar
End mirror head.
[Numerical examples of optical lens]
In the following, attached drawing and table will be referred to, the specific embodiment sum number of optical lens according to an embodiment of the present invention is described
It is worth example, in these Numerical examples, specific value is applied to corresponding embodiment.
Certain lens used in embodiment have non-spherical lenses surface, and aspherical face shape is by following formula (8)
It indicates:
Wherein, Z (h) be it is aspherical along optical axis direction at the position of height h, away from aspheric vertex of surface apart from rise.
C=1/r, r indicate the radius of curvature of lens surface, and k is circular cone coefficient, and A, B, C, D and E are high order aspheric surface system
It counts, the e in coefficient represents scientific notation, as e-05 indicates 10-5。
In addition, Nd indicates refractive index, Vd indicates Abbe number.
First embodiment
As shown in Figure 1, optical lens according to a first embodiment of the present invention sequentially includes: with positive light from the object side to image side
First lens L1 of the falcate of focal power has and is convex to the first surface S1 of object side and concaves towards the second surface S2 of image side；Have
Second lens L2 of the falcate of negative power has and is convex to the first surface S3 of object side and concaves towards the second surface S4 of image side；
Diaphragm L3；The third lens L4 of falcate with positive light coke has the first surface S6 for concaving towards object side and is convex to image side
Second surface S7；The 4th lens L5 with positive light coke has the first surface S8 for being convex to object side and the conduct towards image side
The second surface S9 of plane；Planar lens L6 has the first surface S10 towards the object side and second surface S11 towards image side,
Generally protect glass；L7 is chip.
The lens data of said lens is as shown in following table 1:
[table 1]
In optical lens according to a first embodiment of the present invention, it is preferred that the second lens and the third lens are aspherical
Lens, the first surface S3 and second surface S4 of second lens and the first surface S6 and second surface S7 of the third lens
Circular cone coefficient k and high order aspheric surface coefficient A, B, C, D and E it is as shown in the following Table 2.
[table 2]
| Surface | k | A | B | C | D | E |
| 3 | 0.03333708 | 7.6912E-07 | 8.7172E-08 | -7.5999E-10 | 6.2705E-12 | -6.1236E-15 |
| 4 | 0.000299274 | 1.3244E-05 | 6.6660E-07 | -4.2133E-08 | 5.4625E-10 | -7.7643E-13 |
| 6 | -0.03273183 | -1.9013E-05 | 7.1582E-07 | -6.5983E-10 | -4.4910E-11 | 5.4625E-13 |
| 7 | -0.3122766 | 6.4375E-06 | 5.1146E-08 | 9.8094E-11 | -3.0050E-12 | 4.0456E-15 |
In optical lens according to a first embodiment of the present invention, the focal length F1 of the first lens, the second lens focal length F2,
The focal length F3 of the third lens, the focal length F4 of the 4th lens, the whole group focal length value F of optical lens and the optical length of optical lens
TTL and its between relationship, the relationship between the object side of the second lens and the radius R3 and R4 of image side surface and thickness d 3, and
Relationship between the object side of the third lens and the radius R6 and R7 of image side surface and thickness d 6 is as shown in the following Table 3.
[table 3]
| F1 | 61.304403 |
| F2 | -215.128861 |
| F3 | 593.197686 |
| F4 | 45.130238 |
| F | 44.8016 |
| TTL | 69.5 |
| F1/F | 1.368352983 |
| F4/F | 1.007335408 |
| Shu F2/F Shu | 4.801812011 |
| F3/F | 13.2405469 |
| TTL/F | 1.551283883 |
| (R4+d3)/R3 | 1.147072822 |
| (Shu R6 Shu+d6)/Shu R7 Shu | 1.475974026 |
From the above table 3, it can be seen that, optical lens according to a first embodiment of the present invention meets aforementioned condition expression formula (1)
To (7), to realize that height enters light quantity and small distortion while keeping the miniaturization of optical lens.
Second embodiment
As shown in Fig. 2, optical lens according to a second embodiment of the present invention sequentially includes: with positive light from the object side to image side
First lens L1 of the falcate of focal power has and is convex to the first surface S1 of object side and concaves towards the second surface S2 of image side；Have
Second lens L2 of the falcate of negative power has and is convex to the first surface S3 of object side and concaves towards the second surface S4 of image side；
Diaphragm L3；The third lens L4 of falcate with positive light coke has the first surface S6 for concaving towards object side and is convex to image side
Second surface S7；4th lens L5 of the falcate with positive light coke has the first surface S8 for being convex to object side and concaves towards picture
The second surface S9 of side；Planar lens L6, has a first surface S10 towards object side and the second surface S11 towards image side, and one
As for protection glass；L7 is chip.
The lens data of said lens is as shown in following table 4:
[table 4]
| Surface | Radius | Thickness | Nd | Vd |
| 1 | 31.20044 | 8.718969 | 1.77 | 49.6 |
| 2 | 80.65565 | 0.2 | ||
| 3 | 19.80296 | 8.084195 | 1.58 | 30.2 |
| 4 | 14.8141 | 4.461203 | ||
| STO | Infinitely | 9.127523 | ||
| 6 | -14.25878 | 8.455949 | 1.58 | 30.2 |
| 7 | -16.54439 | 0.2 | ||
| 8 | 30.60641 | 10.62163 | 1.72 | 38.0 |
| 9 | 100 | 11.5569 | ||
| 10 | Infinitely | 2 | 1.46 | 67.8 |
| 11 | Infinitely | 1 | ||
| IMA | Infinitely |
In optical lens according to a first embodiment of the present invention, it is preferred that the second lens and the third lens are aspherical
Lens, the first surface S3 and second surface S4 of second lens and the first surface S6 and second surface S7 of the third lens
Circular cone coefficient k and high order aspheric surface coefficient A, B, C, D and E it is as shown in the following Table 5.
[table 5]
| Surface | k | A | B | C | D | E |
| 3 | 0.004923737 | 3.5375E-07 | 6.3512E-08 | -5.9170E-10 | 2.9997E-12 | -4.6936E-15 |
| 4 | -0.09510785 | 7.0483E-07 | 5.7495E-07 | -9.5986E-09 | 1.0303E-10 | -3.8332E-13 |
| 6 | -0.0296257 | -5.8110E-06 | 2.2961E-07 | -2.0333E-09 | 1.5959E-11 | -1.0375E-13 |
| 7 | -0.2224704 | 4.9119E-06 | 8.4776E-09 | 1.0681E-10 | -1.3194E-13 | -3.2859E-15 |
In optical lens according to a first embodiment of the present invention, the focal length F1 of the first lens, the second lens focal length F2,
The focal length F3 of the third lens, the focal length F4 of the 4th lens, the whole group focal length value F of optical lens and the optical length of optical lens
TTL and its between relationship, the relationship between the object side of the second lens and the radius R3 and R4 of image side surface and thickness d 3, and
Relationship between the object side of the third lens and the radius R6 and R7 of image side surface and thickness d 6 is as shown in the following Table 6.
[table 6]
| F1 | 62.671806 |
| F2 | -250.905034 |
| F3 | 552.269329 |
| F4 | 58.986552 |
| F | 45.4748 |
| TTL | 64.4264 |
| F1/F | 1.378165621 |
| F4/F | 1.297126145 |
| Shu F2/F Shu | 5.517452171 |
| F3/F | 12.14451364 |
| TTL/F | 1.416749496 |
| (R4+d3)/R3 | 1.156306683 |
| (Shu R6 Shu+d6)/Shu R7 Shu | 1.372956573 |
From the above table 6, it can be seen that, optical lens according to a second embodiment of the present invention meets aforementioned condition expression formula (1)
To (7), to realize that height enters light quantity and small distortion while keeping the miniaturization of optical lens.
In conclusion in optical lens according to an embodiment of the present invention, simultaneously by the shapes of each lens of optimal setting
The each power of lens of reasonable distribution can realize that height enters light quantity while keeping camera lens miniaturization.
In optical lens according to an embodiment of the present invention, the meniscus shaped lens of positive light coke is used by the first lens,
More light can be collected and enter optical system, to realize that height enters light quantity.
In optical lens according to an embodiment of the present invention, meniscus shape is used by the first lens, can effectively be subtracted
The bore and the distance between the first lens and the second lens of small second lens, help to realize the miniaturization of optical lens.
In optical lens according to an embodiment of the present invention, it is arranged by the shape and focal power of the second lens, Ke Yishi
The smooth transition of existing light, and reduce the aberration generated by the first lens.
In optical lens according to an embodiment of the present invention, it is arranged by the shape and focal power of the third lens, Ke Yijin
One step reduces the aberration that the first lens and the second lens generate, and helps to adjust imaging size.
In optical lens according to an embodiment of the present invention, it is convex surface by the object side of the 4th lens, helps to collect
Emergent ray from the third lens converges to chip.
In optical lens according to an embodiment of the present invention, by setting bore substantially for the second lens and the third lens
It is identical, the cost of optical lens can be effectively reduced.
In optical lens according to an embodiment of the present invention, by setting aspherical for the second lens and the third lens
Mirror can control disc of confusion size and distortion size and provide excellent optical property.
In optical lens according to an embodiment of the present invention, by setting glass aspheric for the second lens and the third lens
Good thermal stability may be implemented in face lens.
In optical lens according to an embodiment of the present invention, by setting material/outer for the second lens and the third lens
The almost the same plastic aspheric lens of shape, defocus when can be changed with compensation temperature are changed and promote thermal stability, realize wave
The small height of dynamic range enters light quantity.
In optical lens according to an embodiment of the present invention, by setting symmetrical same for the second lens and the third lens
Heart round can effectively correct distortion, guarantee small distortion.
In optical lens according to an embodiment of the present invention, by the way that the second lens and the third lens are disposed proximate to one heart
The glass lens of round are conducive to the processing of eyeglass, realize the low cost of optical lens.
In optical lens according to an embodiment of the present invention, by providing the big aperture of the diaphragm, more multiple reflection can be received
Light.
In optical lens according to an embodiment of the present invention, by the way that the focal length of the first lens and the 4th lens is arranged
Greatly, and the focal length of the second lens and the third lens is arranged small, the energy into camera lens can be made high, to realize that height enters
Light quantity, and obtain big field angle.
In optical lens according to an embodiment of the present invention, by be arranged the first lens to the 4th lens refractive index and Ah
Shellfish coefficient helps to realize gentle transition of the light in entire optical system, so that obtaining height enters light quantity and big field angle.
[configuration of laser radar]
According to another aspect of an embodiment of the present invention, a kind of laser radar is provided, the light including being used as receiving end camera lens
Camera lens is learned, it is the meniscus shaped lens with positive light coke which successively includes: the first lens from the object side to image side, should
The object side of first lens is convex surface, and image side surface is concave surface；Second lens are the meniscus shaped lenses with negative power, this
The object side of two lens is convex surface, and image side surface is concave surface；The third lens are the meniscus shaped lenses with positive light coke, this this
The object side of three lens is concave surface, and image side surface is convex surface；With the 4th lens are the lens with positive light coke, the 4th lens
Object side be convex surface.
Fig. 3 is the schematic block diagram of laser radar according to an embodiment of the present invention.As shown in figure 3, implementing according to the present invention
The laser radar 100 of example includes optical lens 101, and wherein the optical lens 101 is used as the receiving end camera lens of laser radar 100.
In above-mentioned optical lens, the image side surface of the 4th lens is that the image side surface of plane or the 4th lens is concave surface.
In above-mentioned optical lens, second lens and the third lens are non-spherical lenses.
In above-mentioned optical lens, second lens and the third lens have the shape close to concentric circles.
In above-mentioned optical lens, second lens and the third lens are glass lens.
In above-mentioned optical lens, further comprise: big aperture diaphragm, be located at second lens and the third lens it
Between.
In above-mentioned optical lens, which meets the following conditions expression formula (1) to the 4th lens:
TTL/F≤1.6 (1)
Wherein, F is the whole group focal length value of the optical lens, and TTL is the optical length of the optical lens.
In above-mentioned optical lens, the focal length of the first lens to the 4th lens meets the following conditions expression formula respectively
(2) (5) are arrived:
F1/F≤1.6 (2)
Shu >=4 Shu F2/F (3)
F3/F≥12 (4)
F4/F≤1.4 (5)
Wherein, F1 is the focal length of first lens, and F2 is the focal length of second lens, and F3 is the focal length of the third lens,
F4 is the focal length of the 4th lens, and F is the whole group focal length value of the optical lens.
In above-mentioned optical lens, second lens and the third lens meet respectively the following conditions expression formula (6) and
(7):
0.5≤(R4+d3)/R3≤1.5 (6)
0.5≤(Shu R6 Shu+d6)/Shu≤1.5 Shu R7 (7)
Wherein, R3 is the radius of curvature of the object side of second lens, and R4 is the curvature half of the image side surface of second lens
Diameter, d3 are the center thickness of second lens, and R6 is the radius of curvature of the object side of the third lens, and R7 is the third lens
The radius of curvature of image side surface, and d6 is the center thickness of the third lens.
Here, it will be understood by those skilled in the art that optical lens in laser radar according to an embodiment of the present invention
Other details are identical described in optical lens according to an embodiment of the present invention between, and can be using above-mentioned hair
The Numerical examples of the optical lens of bright first embodiment and second embodiment, therefore in order to avoid redundancy and no longer trace.
Optical lens and laser radar according to an embodiment of the present invention pass through the shape of each lens of optimal setting and reasonable
Each power of lens is distributed, can realize that height enters light quantity while keeping camera lens miniaturization.
Optical lens and laser radar according to an embodiment of the present invention use the falcate of positive light coke by the first lens
Lens can collect more light and enter optical system, to realize that height enters light quantity.
Optical lens and laser radar according to an embodiment of the present invention use meniscus shape by the first lens, can be effective
Ground reduces the bore and the distance between the first lens and the second lens of the second lens, helps to realize the small-sized of optical lens
Change.
Optical lens and laser radar according to an embodiment of the present invention, can by shape and the focal power setting of the second lens
To realize the smooth transition of light, and reduce the aberration generated by the first lens.
Optical lens and laser radar according to an embodiment of the present invention, can by shape and the focal power setting of the third lens
To further decrease the aberration that the first lens and the second lens generate, and help to adjust imaging size.
The object side that optical lens and laser radar according to an embodiment of the present invention pass through the 4th lens is convex surface, is facilitated
It collects the emergent ray from the third lens and converges to chip.
Optical lens and laser radar according to an embodiment of the present invention are by setting mouth for the second lens and the third lens
Diameter is roughly the same, and the cost of optical lens can be effectively reduced.
Optical lens and laser radar according to an embodiment of the present invention are by setting non-for the second lens and the third lens
Spherical lens can control disc of confusion size and distortion size and provide excellent optical property.
Optical lens and laser radar according to an embodiment of the present invention are by setting glass for the second lens and the third lens
Good thermal stability may be implemented in glass non-spherical lens.
Optical lens and laser radar according to an embodiment of the present invention are by setting material for the second lens and the third lens
The almost the same plastic aspheric lens of material/shape, defocus when can be changed with compensation temperature is changed and promotes thermal stability, real
The small height of existing fluctuation range enters light quantity.
Optical lens and laser radar according to an embodiment of the present invention are by setting the second lens and the third lens to pair
The concentric circles of title can effectively correct distortion, guarantee small distortion.
Optical lens and laser radar according to an embodiment of the present invention are by setting same for the second lens and the third lens
The glass lens of heart round are conducive to the processing of concentric circles eyeglass, realize the low cost of optical lens.
Optical lens and laser radar according to an embodiment of the present invention can be received more by providing the big aperture of the diaphragm
Reflection light.
Optical lens and laser radar according to an embodiment of the present invention are by setting the focal length of the first lens and the 4th lens
It sets greatly, and the focal length of the second lens and the third lens is arranged small, the energy into camera lens can be made high, to realize
Height enters light quantity, and obtains big field angle.
The refraction that optical lens and laser radar according to an embodiment of the present invention pass through setting the first lens to the 4th lens
Rate and Abbe number help to realize gentle transition of the light in entire optical system, so that obtaining height enters light quantity and big view
Rink corner.
Other lens can also be arranged in optical lens according to an embodiment of the present invention and laser radar.In this feelings
Under condition, optical lens and imaging device according to an embodiment of the present invention can configure there are four or more than four lens, and
These lens include the supplementary lens of the arrangement other than above-mentioned first lens to four lens.
It should be understood by those skilled in the art that foregoing description and the embodiment of the present invention shown in the drawings are only used as illustrating
And it is not intended to limit the present invention.The purpose of the present invention has been fully and effectively achieved.Function and structural principle of the invention exists
It shows and illustrates in embodiment, under without departing from the principle, embodiments of the present invention can have any deformation or modification.
Claims (14)
1. a kind of optical lens, successively includes: from the object side to image side
First lens are the meniscus shaped lenses with positive light coke, and the object side of first lens is convex surface, and image side surface is recessed
Face；
Second lens are the meniscus shaped lenses with negative power, and the object side of second lens is convex surface, and image side surface is recessed
Face；
The third lens are the meniscus shaped lenses with positive light coke, and the object side of the third lens is concave surface, and image side surface is convex
Face；With
4th lens are the lens with positive light coke, and the object side of the 4th lens is convex surface.
2. optical lens according to claim 1, which is characterized in that
The image side surface of 4th lens is plane；Or
The image side surface of 4th lens is concave surface.
3. optical lens according to claim 1, which is characterized in that in second lens and the third lens extremely
Few one is non-spherical lens.
4. optical lens according to claim 3, which is characterized in that second lens and the third lens, which have, to be connect
The shape of nearly concentric circles.
5. optical lens according to claim 4, which is characterized in that second lens and the third lens are plastics
Eyeglass.
6. optical lens according to any one of claim 1 to 3, which is characterized in that further comprise:
Big aperture diaphragm, between second lens and the third lens.
7. optical lens according to any one of claim 1 to 3, which is characterized in that first lens to described
Four lens meet the following conditions expression formula (1):
TTL/F≤1.6 (1)
Wherein, F is the whole group focal length value of the optical lens, and TTL is the optical length of the optical lens.
8. optical lens according to any one of claim 1 to 3, which is characterized in that first lens to described
The focal length of four lens meets the following conditions expression formula (2):
F1/F≤1.6 (2)
Wherein, F1 is the focal length of first lens, and F is the whole group focal length value of the optical lens.
9. optical lens according to any one of claim 1 to 3, which is characterized in that first lens to described
The focal length of four lens meets the following conditions expression formula (3):
Shu >=4 Shu F2/F (3)
Wherein, F2 is the focal length of second lens, and F is the whole group focal length value of the optical lens.
10. optical lens according to any one of claim 1 to 3, which is characterized in that first lens to described
The focal length of four lens meets the following conditions expression formula (4):
F3/F≥12 (4)
Wherein, F3 is the focal length of the third lens, and F is the whole group focal length value of the optical lens.
11. optical lens according to any one of claim 1 to 3, which is characterized in that first lens to described
The focal length of four lens meets the following conditions expression formula (5):
F4/F≤1.4 (5)
Wherein, F4 is the focal length of the 4th lens, and F is the whole group focal length value of the optical lens.
12. optical lens according to any one of claim 1 to 3, which is characterized in that second lens meet following
Conditional expression (6):
0.5≤(R4+d3)/R3≤1.5 (6)
Wherein, R3 is the radius of curvature of the object side of second lens, and R4 is the curvature half of the image side surface of second lens
Diameter, d3 are the center thickness of second lens.
13. optical lens according to any one of claim 1 to 3, which is characterized in that the third lens meet following
Conditional expression (7):
0.5≤(Shu R6 Shu+d6)/Shu≤1.5 Shu R7 (7)
Wherein, R6 is the radius of curvature of the object side of the third lens, and R7 is the curvature half of the image side surface of the third lens
Diameter, and d6 is the center thickness of the third lens.
14. a kind of laser radar, which is characterized in that including optical lens conduct described in any one of claims 1 to 13
Receiving end camera lens.
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| CN110554483A (en) * | 2019-10-15 | 2019-12-10 | 合肥嘉东光学股份有限公司 | Laser profilometer optical system |
| CN111398969A (en) * | 2020-04-27 | 2020-07-10 | 成都英飞睿技术有限公司 | Laser radar and transmitting-receiving device thereof |
| CN112612014A (en) * | 2020-11-27 | 2021-04-06 | 西安知微传感技术有限公司 | High-performance MEMS laser radar receiving system |
| CN115343690A (en) * | 2022-10-14 | 2022-11-15 | 北京摩尔芯光半导体技术有限公司 | Optical transceiver module and laser radar apparatus |
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