CN209117961U - A kind of infrared confocal camera lens - Google Patents
A kind of infrared confocal camera lens Download PDFInfo
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- CN209117961U CN209117961U CN201822213614.4U CN201822213614U CN209117961U CN 209117961 U CN209117961 U CN 209117961U CN 201822213614 U CN201822213614 U CN 201822213614U CN 209117961 U CN209117961 U CN 209117961U
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- infrared confocal
- confocal camera
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Abstract
The utility model embodiment discloses a kind of infrared confocal camera lens.The infrared confocal camera lens includes a refractor group and the image-forming assembly positioned at refractor group light emission side；Refractor group includes the first lens of negative power being arranged successively along light incident direction, the second lens of negative power, positive light coke the third lens, the 4th lens of negative power, the 5th lens of positive focal power, the 6th lens of positive light coke, the 7th lens of negative power and the 8th lens of positive light coke；Wherein the focal length f4 of the 4th lens and the focal length f5 of the 5th lens meet following relationship: ︱ < 1.5 0.8 < ︱ f4/f5；The focal length f6 of 6th lens and the focal length f7 of the 7th lens meet following relationship: ︱ < 1.2 0.5 < ︱ f6/f7.The technical solution of the utility model embodiment, suitable for the infrared confocal lens design of safety-security area, which has visible light and infrared light confocal, and structure is simply and the advantages of high resolution.
Description
Technical field
The utility model embodiment is related to optic technology, more particularly to a kind of infrared confocal camera lens.
Background technique
With the fast development of science and technology, for people to security protection there has also been higher level understanding, monitoring camera is absurd fantastic immediately
It is raw.Compared with zoom lens, tight shot design is simple to manufacture, and the image clearly of the moving object of shooting is stablized, and picture is thin
It is greasy, it is allowed to play an important role in safety monitoring industry.
With the promotion that security protection is realized by society, round-the-clock monitoring is security lens necessary condition, it is desirable that visible light and red
The equal clarity of image is consistent under outer lighting environment, therefore visible light and the confocal camera lens of infrared light have extensive demand.Due to tradition
Tight shot often eyeglass number is more, cause camera lens volume and weight huge, while wasting manpower and material resources, using very
It is inconvenient.Camera lens volume is too big or cost is too high will affect the universal of product and uses.
Utility model content
The utility model embodiment provides a kind of infrared confocal camera lens, to realize the infrared confocal mirror for being suitable for safety-security area
Head design, has visible light and infrared light confocal, and structure is simply and the advantages of high resolution.
The utility model embodiment provides a kind of infrared confocal camera lens, including a refractor group and is located at the refraction
The image-forming assembly of lens group light emission side；
The refractor group includes the first lens of negative power being arranged successively along light incident direction, negative power
Two lens, positive light coke the third lens, the 4th lens of negative power, the 5th lens of positive focal power, the 6th lens of positive light coke, negative light
The 7th lens of focal power and the 8th lens of positive light coke；
Wherein the focal length f4 of the 4th lens and the focal length f5 of the 5th lens meet following relationship:
︱ < 1.5 0.8 < ︱ f4/f5；
The focal length f6 of 6th lens and the focal length f7 of the 7th lens meet following relationship:
︱ < 1.2 0.5 < ︱ f6/f7.
Optionally, refractor group setting coaxial with the image-forming assembly, the image-forming assembly are located at the refraction
On the focal plane of lens group.
Optionally, the image-forming assembly includes photosensitive element and transparent protection plate, and the transparent protection plate is located at the sense
Between optical element and the refractor group.
It optionally, further include diaphragm, between the third lens and the 4th lens.
Optionally, the 4th lens and the 5th lens constitute balsaming lens.
Optionally, first lens, the third lens, the 4th lens and the 5th lens are that spherical surface is saturating
Mirror, second lens, the 6th lens, the 7th lens and the 8th lens are non-spherical lens.
Optionally, the face type of the non-spherical lens is by formula:
It determines, wherein z is rise, and c is the curvature of curved surface apex, and r is surface points coordinate perpendicular to optical axial plane
At a distance from optical axis, k is circular cone coefficient, a for projection1、a2、a3、a4、a5、a6、a7And a8Indicate the corresponding coefficient of even order terms.
Optionally, first lens are meniscus shaped lens, and second lens are meniscus shaped lens, the third lens
For biconvex lens, the 4th lens are biconcave lens, and the 5th lens are biconvex lens, and the 6th lens are lenticular
Mirror, the 7th lens are meniscus shaped lens, and the 8th lens are biconvex lens.
Optionally, the refractor group meets following parameter:
| F1=-6~-8.3 | N1=1.55~1.75 | R1=50~65 | R2=4.5~5.2 |
| F2=-12~-15 | N2=1.55~1.75 | R3=-4.2~-4.6 | R4=-9.3~-11.2 |
| F3=6.5~8.3 | N3=1.83~2.23 | R5=15.3~16.8 | R6=-15.3~-16.8 |
| F4=-6.5~-8.3 | N4=1.83~2.23 | R7=-38.5~-40.2 | R8=8.1~8.42 |
| F5=6.5~8.3 | N5=1.55~1.75 | R9=8.1~8.5 | R10=-8.1~-8.5 |
| F6=10.2~11.8 | N6=1.45~1.65 | R11=8.2~8.4 | R12=-18.5~-20.3 |
| F7=-17~-21 | N7=1.55~1.65 | R13=-5.5~-6.3 | R14=-13.5~14.8 |
| F8=13.6~15.8 | N8=1.45~1.55 | R15=9.8~11.5 | R16=-32.5~-36 |
Wherein, f1~f8 indicates first lens to the focal length of the 8th lens, and unit mm, n1~n8 indicate institute
The first lens are stated to the refractive index of the 7th lens, R1, R3, R5, R7, R9, R11, R13, R15 respectively indicate described in order
Radius of curvature of first lens to the 8th lens towards object space side centre of surface, R2, R4, R6, R8, R10, R12, R14,
R16 respectively indicates radius of curvature of first lens to the 8th lens towards image space side centre of surface in order, single
Position is mm, and "-" indicates that direction is negative.
Optionally, the aperture F of the refractor group is greater than or equal to 1.1.
Infrared confocal camera lens provided by the embodiment of the utility model, including a refractor group and be located at refractor group
The image-forming assembly of light emission side；Refractor group includes the first lens of negative power, the negative light being arranged successively along light incident direction
Power second lens, positive light coke the third lens, the 4th lens of negative power, the 5th lens of positive focal power, positive light coke the 6th are saturating
Mirror, the 7th lens of negative power and the 8th lens of positive light coke；The wherein focal length of the focal length f4 of the 4th lens and the 5th lens
F5 meets ︱ < 1.5 0.8 < ︱ f4/f5；The focal length f6 of 6th lens and the focal length f7 of the 7th lens meet ︱ < 1.2 0.5 < ︱ f6/f7.
It is mutually matched by each power of lens in design refractor group, it is saturating by the focal length f4 and the 5th that the 4th lens are arranged
The focal length f5 of mirror meets ︱ < 1.5 0.8 < ︱ f4/f5；The focal length f6 of 6th lens and the focal length f7 of the 7th lens meet 0.5 < ︱ f6/
︱ < 1.2 f7 can be designed that the optical lens that structure is simple, the visible light of high resolution and infrared light are confocal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the infrared confocal camera lens of one kind provided by the embodiment of the utility model；
Fig. 2 is the modulation transfer function curve synoptic diagram of visible light provided by the embodiment of the utility model；
Fig. 3 is the MTF curve schematic diagram of infrared light provided by the embodiment of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Fig. 1 show the structural schematic diagram of the infrared confocal camera lens of one kind provided by the embodiment of the utility model.With reference to Fig. 1,
The infrared confocal camera lens includes a refractor group 10 and the image-forming assembly 20 positioned at 10 light emission side of refractor group；Refraction is saturating
Microscope group 10 includes the first lens of negative power 101 being arranged successively along light incident direction, the second lens of negative power 102, just
Focal power the third lens 103, the 4th lens 104 of negative power, the 5th lens 105 of positive focal power, the 6th lens 106 of positive light coke,
The 7th lens 107 of negative power and the 8th lens 108 of positive light coke；The wherein focal length f4 and the 5th lens of the 4th lens 104
105 focal length f5 meets following relationship: ︱ < 1.5 0.8 < ︱ f4/f5；The focal length f6 of 6th lens 106 and the coke of the 7th lens 107
Meet following relationship: ︱ < 1.2 0.5 < ︱ f6/f7 away from f7.
Wherein it is possible to understand, focal power is equal to the difference of image space light beam convergence and object space light beam convergence, it is characterized
The ability of optical system deviation light.The absolute value of focal power is bigger, stronger to the bending ability of light, the absolute value of focal power
It is smaller, it is weaker to the bending ability of light.When focal power is positive number, the flexion of light is convergence property；When focal power is negative,
The flexion of light is diversity.Focal power can be adapted for some plane of refraction (i.e. one of lens for characterizing a lens
Surface), it can be adapted for characterizing some lens, be readily applicable to characterize system (the i.e. lens that multiple lens are collectively formed
Group).In the present embodiment, each lens can be fixed in a lens barrel (not shown in figure 1), passes through reasonable distribution lens
Focal power, camera lens can be made to realize in the wave-length coverage of 436nm~850nm confocal, in one of the utility model implementation
In example, the aperture F=1.1 of refractor group can match the image-forming assembly of 6,000,000 pixels and 6,000,000 pixels or more, have logical
The advantages of light quantity is big, high resolution.
The technical solution of the present embodiment is mutually matched by each power of lens in design refractor group, is passed through
The focal length f5 of focal length f4 and the 5th lens that the 4th lens are arranged meet ︱ < 1.5 0.8 < ︱ f4/f5；The focal length f6 of 6th lens and
The focal length f7 of 7th lens meets ︱ < 1.2 0.5 < ︱ f6/f7, can be designed that simple structure, visible light of high resolution and infrared
The confocal optical lens of light.
Based on the above technical solution, optionally, it continues to refer to figure 1, refractor group 10 and image-forming assembly 20 are total
Axis setting, image-forming assembly 20 are located on the focal plane of refractor group 10.
It is understood that refractor group can be reduced by the setting coaxial with image-forming assembly 10 of refractor group 10
Complexity when 10 design improves the imaging precision of refractor group 10, image-forming assembly 20 is set to refractor group 10 and is gone out
On the focal plane of light side.
Optionally, image-forming assembly 20 includes photosensitive element 201 and transparent protection plate 202, and transparent protection plate 202 is located at photosensitive
Between element 201 and refractor group 10.
Illustratively, transparent protection plate 202 can be glass plate, or with the optical filter for filtering out certain light functions,
For protecting photosensitive element 201, photosensitive element 201 may include charge coupled device ccd or complementary metal oxide semiconductor
CMOS, it is optional that COMS is selected to make photosensitive element in the present embodiment, the cost of camera lens can be effectively reduced.
Optionally, it continues to refer to figure 1, which further includes diaphragm 30, is located at the third lens 103 and the 4th thoroughly
Between mirror 104.Diaphragm 30 is used for can be with the light passing amount of infrared confocal camera lens.
Optionally, the 4th lens 104 and the 5th lens 105 constitute balsaming lens.
It is understood that balsaming lens includes two lens, and the surface shape phase of two lens sides adjacent to one another
Together and fit together.Balsaming lens has good aberration correction ability, is particularly suitable for the correction of color difference.The utility model
In embodiment, the 4th lens 104 and the 5th lens 105 constitute balsaming lens, are conducive to the correction of color difference in infrared confocal camera lens.
Optionally, the first lens 101, the third lens 103, the 4th lens 104 and the 5th lens 105 are spherical lens,
Second lens 102, the 6th lens 106, the 7th lens 107 and the 8th lens 108 are non-spherical lens.
Illustratively, in the present embodiment, the first lens 101, the third lens 103, the 4th lens 104 and the 5th lens
105 select glass material to form spherical lens, have the function of that correction is infrared, and the second lens 102, the 6th lens the 106, the 7th are thoroughly
Mirror 107 and the 8th lens 108 select plastic material to form non-spherical lens, can effectively eliminate aberration.
Optionally, the face type of non-spherical lens is by formula:
It determines, wherein z is rise, and c is the curvature of curved surface apex, and r is surface points coordinate perpendicular to optical axial plane
At a distance from optical axis, k is circular cone coefficient, a for projection1、a2、a3、a4、a5、a6、a7And a8Indicate the corresponding coefficient of even order terms.
In the present embodiment, the even term coefficient of non-spherical lens are as follows:
1 non-spherical lens face shape parameter of table
| a1 | a2 | a3 | a4 | a5 | a6 | a7 | a8 | |
| Face serial number 3 | 0 | -3.34E-03 | -1.87E-05 | 3.85E-06 | -2.40E-07 | 1.17E-09 | 2.37E-07 | 0 |
| Face serial number 4 | 0 | -9.08E-02 | 1.15E-06 | 5.32E-06 | 2.79E-06 | 3.13E-09 | 2.34E-08 | 0 |
| Face serial number 11 | 0 | 4.48E-03 | -2.14E-03 | -6.47E-05 | 2.28E-07 | -1.93E-07 | -2.37E-09 | 0 |
| Face serial number 12 | 0 | -2.59E-02 | -1.21E-04 | 4.35E-06 | 4.28E-07 | 1.96E-08 | 2.85E-08 | 0 |
| Face serial number 13 | 0 | -1.30E-03 | -7.83E-06 | 3.47E-06 | -6.24E-08 | 6.33E-09 | 1.87E-07 | 0 |
| Face serial number 14 | 0 | -3.11E-06 | 3.53E-06 | -4.54E-05 | 2.54E-07 | -3.50E-06 | -9.12E-06 | 0 |
| Face serial number 15 | 0 | -1.52E-05 | -9.62E-06 | 2.36E-06 | -5.08E-08 | 7.53E-08 | 1.19E-08 | 0 |
| Face serial number 16 | 0 | -2.11E-04 | 2.43E-04 | -3.54E-07 | 2.31E-06 | -2.50E-07 | -2.14E-07 | 0 |
Wherein, face serial number 3, face serial number 11, face serial number 13 and face serial number 15 respectively correspond the second lens 102, the 6th lens
106, the front surface of the 7th lens 107 and the 8th lens 108 close to object plane, face serial number 4, face serial number 12, face serial number 14 and face
Serial number 16 respectively corresponds the second lens 102, the 6th lens 106, the 7th lens 107 and the 8th lens 108 after image planes
Surface.
Optionally, it continues to refer to figure 1, in a specific example of the utility model embodiment, the first lens 101 are curved
Moon-shaped lens, the second lens 102 are meniscus shaped lens, and the third lens 103 are biconvex lens, and the 4th lens 104 are biconcave lens,
5th lens 105 are biconvex lens, and the 6th lens 106 are biconvex lens, and the 7th lens 107 are meniscus shaped lens, the 8th lens
108 be biconvex lens.
It is understood that specific lens shape can be specific the above is only one according to the design alternative of angular
Example, be not the limitation to the utility model embodiment.
Optionally, refractor group 10 meets following parameter:
2 refractor group parameter of table
Wherein, f1~f8 indicates that the focal length of the first lens to the 8th lens, unit mm, n1~n8 indicate that the first lens arrive
The refractive index of 7th lens, R1, R3, R5, R7, R9, R11, R13, R15 respectively indicate the first lens to the 8th lens court in order
To the radius of curvature of object space side centre of surface, R2, R4, R6, R8, R10, R12, R14, R16 respectively indicate first thoroughly in order
Radius of curvature of the mirror to the 8th lens towards image space side centre of surface, unit mm, "-" indicate that direction is negative.
Optionally, the aperture F of refractor group 10 is greater than or equal to 1.1.In the present embodiment, the aperture of refractor group
F=1.1 has light passing amount big a little.
Table 3 show the structural parameters of the compound lens value of a specific embodiment of the utility model embodiment:
A kind of design value of lens in 3 refractor group of table
Wherein, face serial number 1 indicate the first lens 101 close to object space front surface, and so on, PL indicates that the surface is flat
Face, since the 4th lens 104 and the 5th lens 105 are balsaming lens, common surface 9, face serial number 17 and 18 indicates transparency protected
Two surfaces of plate 202；R indicates spherical radius, and positive to indicate sphere centre close to image planes side, bearing indicates sphere centre close to object
Face side；D indicates Current surface to the distance on optical axis on next surface；The refractive index of nd expression lens；K indicates aspherical
Circular cone coefficient.
In addition, spacer ring (not shown in figure 1) is additionally provided between each lens, specifically, 101 second lens of the first lens
102 are abutted by SOMA piece, and the second lens 102 are combined closely with the third lens by metal spacer ring, the third lens 103 and the 4th
Lens 104 are combined closely by spacer ring, and the 5th lens 105 and the 6th lens 106 are fitted close by spacer ring, the 6th lens 106
It is abutted with the 7th lens 107 by SOMA piece, the 7th lens 107 are abutted with the 8th lens 108 by SOMA piece.
Infrared confocal camera lens provided in this embodiment can reach the resolution of 6,000,000 pixels under visible light and infrared state
Rate can match 6,000,000 1/2.7 inches of CMOS chips, can get clear picture under night low light environment.Together
When, the design uses in -40 DEG C~80 DEG C environment and does not run coke.
Specifically, Fig. 2 show the modulation transfer function curve signal of visible light provided by the embodiment of the utility model
Figure, Fig. 3 show the MTF curve schematic diagram of infrared light provided by the embodiment of the utility model.Reach the resolution of 6,000,000 pixels
Rate, need spatial resolution be 200 lines it is right/millimeter when, the MTF of the visible light of central vision is greater than 0.4, peripheral field
MTF is greater than 0.2, and the MTF that the MTF of the infrared light of central vision is greater than 0.4,0.7 times of peripheral field is greater than 0.2.With reference to Fig. 2 and figure
3 it is found that be all satisfied the condition that resolution ratio is greater than 6,000,000 pixels for visible light and infrared light.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of infrared confocal camera lens, which is characterized in that go out light including a refractor group and positioned at the refractor group
The image-forming assembly of side；
The refractor group includes that the first lens of negative power being arranged successively along light incident direction, negative power second are saturating
Mirror, positive light coke the third lens, the 4th lens of negative power, the 5th lens of positive focal power, the 6th lens of positive light coke, negative power
The 8th lens of 7th lens and positive light coke；
Wherein the focal length f4 of the 4th lens and the focal length f5 of the 5th lens meet following relationship:
︱ < 1.5 0.8 < ︱ f4/f5；
The focal length f6 of 6th lens and the focal length f7 of the 7th lens meet following relationship:
︱ < 1.2 0.5 < ︱ f6/f7.
2. infrared confocal camera lens according to claim 1, which is characterized in that the refractor group and the image-forming assembly
Coaxial setting, the image-forming assembly are located on the focal plane of the refractor group.
3. infrared confocal camera lens according to claim 2, which is characterized in that the image-forming assembly include photosensitive element and thoroughly
Bright protection board, the transparent protection plate is between the photosensitive element and the refractor group.
4. infrared confocal camera lens according to claim 1, which is characterized in that further include diaphragm, be located at the third lens
Between the 4th lens.
5. infrared confocal camera lens according to claim 1, which is characterized in that the 4th lens and the 5th lens structure
At balsaming lens.
6. infrared confocal camera lens according to claim 1, which is characterized in that first lens, the third lens, institute
Stating the 4th lens and the 5th lens is spherical lens, second lens, the 6th lens, the 7th lens with
And the 8th lens are non-spherical lens.
7. infrared confocal camera lens according to claim 6, which is characterized in that the face type of the non-spherical lens is by formula:
It determines, wherein z is rise, and c is the curvature of curved surface apex, and r is surface points coordinate in the projection perpendicular to optical axial plane
At a distance from optical axis, k is circular cone coefficient, a1、a2、a3、a4、a5、a6、a7And a8Indicate the corresponding coefficient of even order terms.
8. infrared confocal camera lens according to claim 1, which is characterized in that first lens are meniscus shaped lens, institute
State the second lens be meniscus shaped lens, the third lens be biconvex lens, the 4th lens be biconcave lens, the described 5th
Lens are biconvex lens, and the 6th lens are biconvex lens, and the 7th lens are meniscus shaped lens, and the 8th lens are
Biconvex lens.
9. infrared confocal camera lens according to claim 1, which is characterized in that the refractor group meets following parameter:
Wherein, f1~f8 indicates focal length of first lens to the 8th lens, and unit mm, n1~n8 indicate described the
For one lens to the refractive index of the 7th lens, R1, R3, R5, R7, R9, R11, R13, R15 respectively indicate described first in order
Radius of curvature of the lens to the 8th lens towards object space side centre of surface, R2, R4, R6, R8, R10, R12, R14, R16
Radius of curvature of first lens to the 8th lens towards image space side centre of surface is respectively indicated in order, and unit is
Mm, "-" indicate that direction is negative.
10. infrared confocal camera lens according to claim 1, which is characterized in that the aperture F of the refractor group be greater than or
Equal to 1.1.
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| CN201822213614.4U CN209117961U (en) | 2018-12-26 | 2018-12-26 | A kind of infrared confocal camera lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507785A (en) * | 2018-12-26 | 2019-03-22 | 东莞市宇瞳光学科技股份有限公司 | A kind of infrared confocal camera lens |
| WO2021128383A1 (en) * | 2019-12-28 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN115327742A (en) * | 2021-05-10 | 2022-11-11 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
-
2018
- 2018-12-26 CN CN201822213614.4U patent/CN209117961U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507785A (en) * | 2018-12-26 | 2019-03-22 | 东莞市宇瞳光学科技股份有限公司 | A kind of infrared confocal camera lens |
| WO2021128383A1 (en) * | 2019-12-28 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN115327742A (en) * | 2021-05-10 | 2022-11-11 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
| CN115327742B (en) * | 2021-05-10 | 2024-03-22 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
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