CN212965592U - Iris zooming imaging lens, iris zooming imaging module and iris recognition device - Google Patents
Iris zooming imaging lens, iris zooming imaging module and iris recognition device Download PDFInfo
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- CN212965592U CN212965592U CN202021311550.2U CN202021311550U CN212965592U CN 212965592 U CN212965592 U CN 212965592U CN 202021311550 U CN202021311550 U CN 202021311550U CN 212965592 U CN212965592 U CN 212965592U
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Abstract
The utility model discloses an iris zooms imaging lens, iris zooms imaging module and iris recognition device belongs to the iris recognition field, it includes along the first fixed lens group that the optical axis set gradually from the front to the back, first removal lens group, second removal lens group and the fixed lens group of second, first fixed lens group includes first lens and second lens, first removal includes third lens, fourth lens and fifth lens, the second removes the lens group and includes sixth lens, seventh lens and eighth lens, the fixed lens group of second includes ninth lens, tenth lens, eleventh lens, twelfth lens and thirteenth lens. The first lens element to the thirteenth lens element are, in order, a biconvex lens element, a plano-concave lens element, a biconvex lens element, a biconcave lens element, a biconvex lens element, a plano-concave lens element, a biconvex lens element, a planar lens element, and a plano-concave lens element. The lens has the advantages of simple overall structure, small volume, wide zooming and collecting range and high imaging quality.
Description
Technical Field
The utility model relates to an iris discernment field especially indicates an iris zooms imaging lens, iris zooms imaging module and iris recognition device.
Background
With the advent of the internet information age, the security and stability requirements of people on information, especially personal information, have been increasing, and the application of identity authentication using unique physiological characteristics or behavioral characteristics inherent to people itself has become more and more widespread, wherein iris recognition technology is gaining favor as "most accurate" and "most difficult to counterfeit" biometric technology. However, iris recognition is a biological recognition technology based on the texture characteristics of the iris of an eye, and because the surface of the iris is a spherical surface, the area is small, and the color is dark, the requirement on the imaging quality of an optical system for acquiring an iris image is high, and how to obtain the iris image with high quality and clear texture details becomes a difficult problem to be overcome urgently.
The existing iris collecting optical system can be divided into a fixed-focus optical system and a zooming optical system, wherein the fixed-focus optical system has simple structure, low manufacturing cost and convenient device and can meet the requirement of miniaturization. However, the fixed-focus optical system has a single focal length, a limited shooting range and difficulty in realizing a large depth of field, and a clear iris image can be acquired only by high cooperation of a user. The zoom optical system can realize continuous change of focal length, can realize wide shooting range and does not need user cooperation. However, the existing zoom system has large volume, complex structure, high cost and large assembly difficulty.
SUMMERY OF THE UTILITY MODEL
For solving prior art's zoom system bulky, the structure is complicated, the cost is high, the big problem of the assembly degree of difficulty, the utility model provides an iris zooms imaging lens, iris zooms imaging module and iris recognition device, this camera lens overall structure is simple, and is small, zooms and the collection scope is wider, and the imaging quality is high.
The utility model provides a technical scheme as follows:
the utility model provides an iris zoom imaging lens, its includes along the first fixed lens group, first removal lens group, second removal lens group and the fixed lens group of second that the optical axis direction set gradually from the front to the back, first removal lens group and second removal lens group can be along the optical axis direction back-and-forth movement, wherein:
the first fixed lens group comprises a first lens and a second lens which are sequentially arranged from front to back along the direction of an optical axis, the first lens is a biconvex lens, and the second lens is a plano-concave lens;
the first moving lens group comprises a third lens, a fourth lens and a fifth lens which are sequentially arranged from front to back along the optical axis direction, wherein the third lens is a biconvex lens, the fourth lens is a biconcave lens, and the fifth lens is a biconcave lens;
the second moving lens group comprises a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from front to back along the optical axis direction, wherein the sixth lens is a biconvex lens, the seventh lens is a biconvex lens, and the eighth lens is a plano-concave lens;
the second fixed lens group comprises a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens which are sequentially arranged from front to back along the optical axis direction, wherein the ninth lens is a biconcave lens, the tenth lens is a biconvex lens, the eleventh lens is a biconvex lens, the twelfth lens is a plane lens, and the thirteenth lens is a plano-concave lens.
Further, the front surface of the first lens is a forward convex surface, the rear surface of the first lens is a backward convex surface, the front surface of the second lens is a backward concave surface, and the rear surface of the second lens is a plane;
the front surface of the third lens is a forward convex surface, the rear surface of the third lens is a backward convex surface, the front surface of the fourth lens is a backward concave surface, the rear surface of the fourth lens is a forward concave surface, the front surface of the fifth lens is a backward concave surface, and the rear surface of the fifth lens is a forward concave surface;
the front surface of the sixth lens is a forward convex surface, the rear surface of the sixth lens is a backward convex surface, the front surface of the seventh lens is a forward convex surface, the rear surface of the seventh lens is a backward convex surface, the front surface of the eighth lens is a backward concave surface, and the rear surface of the eighth lens is a plane;
the front surface of the ninth lens is a backward concave surface, the rear surface of the ninth lens is a forward concave surface, the front surface of the tenth lens is a forward convex surface, the rear surface of the tenth lens is a backward convex surface, the front surface of the eleventh lens is a forward convex surface, the rear surface of the eleventh lens is a backward convex surface, the front surface and the rear surface of the twelfth lens are both planes, the front surface of the thirteenth lens is a plane, and the rear surface of the thirteenth lens is a forward concave surface.
Further, the rear surface of the first lens is cemented with the front surface of the second lens, the rear surface of the third lens is cemented with the front surface of the fourth lens, the rear surface of the seventh lens is cemented with the front surface of the eighth lens, the rear surface of the ninth lens is cemented with the front surface of the tenth lens, and the rear surface of the twelfth lens is cemented with the front surface of the thirteenth lens.
Further, a first space ring is arranged between the sixth lens and the seventh lens and between the sixth lens and the eighth lens which are glued together, and the sixth lens, the seventh lens, the eighth lens and the first space ring are arranged in the same lens barrel;
a second space ring is arranged between the eleventh lens and the ninth lens and the tenth lens which are glued together, a third space ring is arranged between the eleventh lens and the twelfth lens and the thirteenth lens which are glued together, and the ninth lens, the thirteenth lens, the second space ring and the third space ring are arranged in the same lens barrel.
Further, a diaphragm is arranged between the second movable lens group and the second fixed lens group.
Furthermore, an optical filter is arranged behind the second fixed lens group.
Further, near-infrared band antireflection films are plated on the front surfaces and the rear surfaces of the first lens, the second lens and the thirteenth lens.
Furthermore, the first lens to the thirteenth lens are spherical mirrors or aspherical mirrors, and the first lens to the thirteenth lens are made of plastic or glass.
An iris zooming imaging module comprises the iris zooming imaging lens and an image sensor positioned behind the iris zooming imaging lens, wherein the image sensor is a CCD (charge coupled device) or CMOS (complementary metal oxide semiconductor) sensor.
An iris recognition device comprises the iris zooming imaging module.
The utility model discloses following beneficial effect has:
the structure of two fixed lens groups and two movable lens groups is adopted, so that the whole lens is simple in structure, small and wide in zooming range. The zoom lens has good optical performance in a zoom range, has high imaging quality in a near infrared band and almost has no distortion. The binocular iris image can be acquired simultaneously for iris recognition, and the acquisition range is wide.
Drawings
Fig. 1 is a schematic structural view of an iris zoom imaging lens of the present invention;
fig. 2 to 6 are graphs of MTF curves of optical transfer functions corresponding to five focal lengths in the entire zoom range of the iris zoom imaging lens of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
Example 1:
the embodiment of the utility model provides an iris imaging lens that zooms, as shown in fig. 1, this camera lens includes first fixed lens group 100, first mobile lens group 200, second mobile lens group 300 and the fixed lens group 400 of second that set gradually from front to back along the optical axis direction, and first mobile lens group 200 and second mobile lens group 300 can be along the optical axis direction back-and-forth movement, wherein:
the first fixed lens group 100 includes a first lens element 1 and a second lens element 2 sequentially arranged from front to back in the optical axis direction, the first lens element 1 being a biconvex lens element, and the second lens element 2 being a plano-concave lens element.
The first moving lens group 200 includes a third lens element 3, a fourth lens element 4 and a fifth lens element 5 sequentially arranged from front to back in the optical axis direction, the third lens element 3 being a biconvex lens element, the fourth lens element 4 being a biconcave lens element and the fifth lens element 5 being a biconcave lens element.
The second moving lens group 300 includes a sixth lens element 6, a seventh lens element 7, and an eighth lens element 8, which are sequentially disposed from front to back in the optical axis direction, the sixth lens element 6 being a biconvex lens element, the seventh lens element 7 being a biconvex lens element, and the eighth lens element 8 being a plano-concave lens element.
The second fixed lens group 400 includes a ninth lens element 9, a tenth lens element 10, an eleventh lens element 11, a twelfth lens element 12, and a thirteenth lens element 13 arranged in order from front to rear in the optical axis direction, the ninth lens element 9 being a biconcave lens element, the tenth lens element 10 being a biconvex lens element, the eleventh lens element 11 being a biconvex lens element, the twelfth lens element 12 being a planar lens element, and the thirteenth lens element 13 being a plano-concave lens element.
The utility model discloses a structure of two sets of fixed camera lens groups, two sets of moving lens groups, camera lens overall structure is simple, and is miniaturized. When zooming, the first fixed lens group and the second fixed lens group are fixed, and the first movable lens group and the second movable lens group are driven by the power source to move back and forth along the optical axis direction, so that zooming is realized. The power source of zooming is a zooming motor, the model of the zooming motor is preferably AN41908A loose, the zooming motor can control the first/second moving lens group to move according to the algorithm of definition judgment, so as to change the focal length, the zooming range is 50-200cm, and the zooming range is wider.
Fig. 2-6 are the optical transfer function MTF graph that wherein five focuses correspond in whole zoom range, can see from the graph, the utility model discloses an iris zoom imaging lens it has good optical performance in zoom range, has higher imaging quality, nearly distortionless at near-infrared wave band.
The utility model discloses an iris zooms imaging lens's object plane size is similar to a people's face size, is about 30cm, and 3lp/mm is less than or equal to lens resolution and is less than or equal to 8lp/mm, and lens resolution is on average 4lp/mm, and 16pixel/mm is less than or equal to sampling resolution and is less than or equal to 26pixel/mm, and the camera lens is fixed focus the depth of field and is greater than 4m, and the scope of zooming is 50-200 cm. It is thus clear that the utility model discloses an iris zooms imaging lens can gather two mesh iris images simultaneously, carries out iris discernment, and the collection scope is wide.
Compared with the prior art, the utility model discloses following beneficial effect has:
the structure of two fixed lens groups and two movable lens groups is adopted, so that the whole lens is simple in structure, small and wide in zooming range. The zoom lens has good optical performance in a zoom range, has high imaging quality in a near infrared band and almost has no distortion. The binocular iris image can be acquired simultaneously for iris recognition, and the acquisition range is wide.
The specific structures of the first lens to the thirteenth lens are as follows:
the front surface of the first lens 1 is a convex surface facing forward, the rear surface is a convex surface facing backward, the front surface of the second lens 2 is a concave surface facing backward, and the rear surface is a flat surface.
The front surface of the third lens 3 is a convex surface facing forward, the rear surface is a convex surface facing backward, the front surface of the fourth lens 4 is a concave surface facing backward, the rear surface is a concave surface facing forward, the front surface of the fifth lens 5 is a concave surface facing backward, and the rear surface is a concave surface facing forward.
The front surface of the sixth lens 6 is a convex surface facing forward, the rear surface is a convex surface facing backward, the front surface of the seventh lens 7 is a convex surface facing forward, the rear surface is a convex surface facing backward, the front surface of the eighth lens 8 is a concave surface facing backward, and the rear surface is a flat surface.
The front surface of the ninth lens element 9 is a concave surface facing backward, the rear surface is a concave surface facing forward, the front surface of the tenth lens element 10 is a convex surface facing forward, the rear surface is a convex surface facing backward, the front surface of the eleventh lens element 11 is a convex surface facing forward, the rear surface is a convex surface facing backward, the front surface and the rear surface of the twelfth lens element 12 are both flat surfaces, the front surface of the thirteenth lens element 13 is a flat surface, and the rear surface is a concave surface facing forward.
The rear surface of the first lens 1 is cemented to the front surface of the second lens 2, the rear surface of the third lens 3 is cemented to the front surface of the fourth lens 4, the rear surface of the seventh lens 7 is cemented to the front surface of the eighth lens 8, the rear surface of the ninth lens 9 is cemented to the front surface of the tenth lens 10, the rear surface of the twelfth lens 12 is cemented to the front surface of the thirteenth lens 13, and the cemented lenses become cemented lenses.
When assembling the respective lenses of the second moving lens group, one possible way of assembling is: a first spacer is provided between the sixth lens 6 and the seventh lens 7 and the eighth lens 8 that are cemented together, and then the sixth lens 6, the seventh lens 7, the eighth lens 8, and the first spacer are mounted in the same barrel.
When assembling the respective lenses of the second fixed lens group, one possible way of assembling is: a second space ring is provided between the eleventh lens 11 and the ninth and tenth lenses 9 and 10 cemented together, a third space ring is provided between the eleventh lens 11 and the twelfth and thirteenth lenses 12 and 13 cemented together, and then the ninth to thirteenth lenses and the second and third space rings are mounted in the same lens barrel.
The utility model discloses an iris zooms imaging lens still includes the diaphragm, and the position that sets up of diaphragm is preferred between second mobile lens group 300 and the fixed lens group 400 of second, namely between eighth lens 8 and ninth lens 9.
Avoid the interference of other light when guaranteeing to form images, eliminate the influence of clutter, the utility model discloses an iris zoom imaging lens still includes the light filter, and the light filter is preferred to be set up at the rear of the fixed lens group 400 of second, also is the rear of thirteenth lens 13. The optical filter can filter visible light and transmit near infrared light, and the optical filter can be a plane optical filter or a curved surface optical filter.
The utility model discloses an iris zooms imaging lens's formation of image wavelength is near infrared wave band 700nm-900nm, for guaranteeing this wave band light transmittance, all plates near infrared wave band antireflection coating on the front surface of first lens to thirteenth lens and the rear surface.
The first to thirteenth lenses may be spherical or aspherical (any surface of the lens is aspherical, and the lens is aspherical, otherwise the lens is spherical), and the materials of the first to thirteenth lenses may be plastic or glass.
Example 2:
the embodiment of the utility model provides an iris zooms imaging module, including embodiment 1 the iris zoom imaging lens and be located the iris and zoom the image sensor at imaging lens rear, image sensor is CCD or CMOS sensor.
The image sensor of the embodiment is 800 ten thousand pixels, and the model of the image sensor can be SonyIMX274 or SonyIMX 415.
The utility model discloses an iris zooms imaging module includes embodiment 1 iris zooms imaging lens, its beneficial effect that possesses iris zooms imaging lens of embodiment 1 promptly, no longer gives unnecessary details here. Other parts of this embodiment not mentioned above can be referred to the corresponding parts in the foregoing embodiment 1.
Example 3:
an embodiment of the utility model provides an iris recognition device, including embodiment 2 the iris zoom imaging module.
The utility model discloses an iris recognition device includes embodiment 2 iris zoom imaging module and embodiment 1 iris zoom imaging lens, its beneficial effect that possesses iris zoom imaging lens of embodiment 1 promptly, no longer give unnecessary details here. Other parts of this embodiment not mentioned above can be referred to the corresponding parts in the foregoing embodiment 1.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides an iris imaging lens that zooms, its characterized in that includes first fixed lens group, first removal lens group, second removal lens group and the fixed lens group of second that sets gradually from the front to the back along the optical axis direction, first removal lens group and second removal lens group can be along the optical axis direction back-and-forth movement, wherein:
the first fixed lens group comprises a first lens and a second lens which are sequentially arranged from front to back along the direction of an optical axis, the first lens is a biconvex lens, and the second lens is a plano-concave lens;
the first moving lens group comprises a third lens, a fourth lens and a fifth lens which are sequentially arranged from front to back along the optical axis direction, wherein the third lens is a biconvex lens, the fourth lens is a biconcave lens, and the fifth lens is a biconcave lens;
the second moving lens group comprises a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from front to back along the optical axis direction, wherein the sixth lens is a biconvex lens, the seventh lens is a biconvex lens, and the eighth lens is a plano-concave lens;
the second fixed lens group comprises a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens which are sequentially arranged from front to back along the optical axis direction, wherein the ninth lens is a biconcave lens, the tenth lens is a biconvex lens, the eleventh lens is a biconvex lens, the twelfth lens is a plane lens, and the thirteenth lens is a plano-concave lens.
2. The iris zoom imaging lens as claimed in claim 1, wherein the front surface of the first lens is convex forward, the rear surface is convex backward, the front surface of the second lens is concave backward, and the rear surface is flat;
the front surface of the third lens is a forward convex surface, the rear surface of the third lens is a backward convex surface, the front surface of the fourth lens is a backward concave surface, the rear surface of the fourth lens is a forward concave surface, the front surface of the fifth lens is a backward concave surface, and the rear surface of the fifth lens is a forward concave surface;
the front surface of the sixth lens is a forward convex surface, the rear surface of the sixth lens is a backward convex surface, the front surface of the seventh lens is a forward convex surface, the rear surface of the seventh lens is a backward convex surface, the front surface of the eighth lens is a backward concave surface, and the rear surface of the eighth lens is a plane;
the front surface of the ninth lens is a backward concave surface, the rear surface of the ninth lens is a forward concave surface, the front surface of the tenth lens is a forward convex surface, the rear surface of the tenth lens is a backward convex surface, the front surface of the eleventh lens is a forward convex surface, the rear surface of the eleventh lens is a backward convex surface, the front surface and the rear surface of the twelfth lens are both planes, the front surface of the thirteenth lens is a plane, and the rear surface of the thirteenth lens is a forward concave surface.
3. The iris zoom imaging lens as claimed in claim 2, wherein the rear surface of the first lens is cemented with the front surface of the second lens, the rear surface of the third lens is cemented with the front surface of the fourth lens, the rear surface of the seventh lens is cemented with the front surface of the eighth lens, the rear surface of the ninth lens is cemented with the front surface of the tenth lens, and the rear surface of the twelfth lens is cemented with the front surface of the thirteenth lens.
4. The iris zoom imaging lens of claim 3, wherein a first spacer is arranged between the sixth lens and the seventh lens and the eighth lens which are glued together, and the sixth lens, the seventh lens, the eighth lens and the first spacer are mounted in the same lens barrel;
a second space ring is arranged between the eleventh lens and the ninth lens and the tenth lens which are glued together, a third space ring is arranged between the eleventh lens and the twelfth lens and the thirteenth lens which are glued together, and the ninth lens, the thirteenth lens, the second space ring and the third space ring are arranged in the same lens barrel.
5. An iris zoom imaging lens unit as claimed in any one of claims 1 to 4, wherein a diaphragm is disposed between the second moving lens group and the second fixed lens group.
6. The iris zoom imaging lens as claimed in claim 5, wherein an optical filter is disposed behind the second fixed lens group.
7. An iris zoom imaging lens as claimed in claim 6, wherein near infrared band antireflection films are coated on the front and rear surfaces of the first to thirteenth lenses.
8. The iris zoom imaging lens of claim 7, wherein the first to thirteenth lenses are spherical or aspherical lenses, and the material of the first to thirteenth lenses is plastic or glass.
9. An iris zooming imaging module, characterized in that, it comprises an iris zooming imaging lens of any one of claims 1 to 8 and an image sensor located behind the iris zooming imaging lens, wherein the image sensor is a CCD or CMOS sensor.
10. An iris recognition device comprising the iris zoom imaging module of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021311550.2U CN212965592U (en) | 2020-07-07 | 2020-07-07 | Iris zooming imaging lens, iris zooming imaging module and iris recognition device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021311550.2U CN212965592U (en) | 2020-07-07 | 2020-07-07 | Iris zooming imaging lens, iris zooming imaging module and iris recognition device |
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| CN212965592U true CN212965592U (en) | 2021-04-13 |
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| CN202021311550.2U Active CN212965592U (en) | 2020-07-07 | 2020-07-07 | Iris zooming imaging lens, iris zooming imaging module and iris recognition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115145009A (en) * | 2022-09-02 | 2022-10-04 | 浙江大华技术股份有限公司 | Lens and camera device |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115145009A (en) * | 2022-09-02 | 2022-10-04 | 浙江大华技术股份有限公司 | Lens and camera device |
| CN115145009B (en) * | 2022-09-02 | 2022-11-22 | 浙江大华技术股份有限公司 | Lens and camera device |
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