CN109975953A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN109975953A CN109975953A CN201910152492.9A CN201910152492A CN109975953A CN 109975953 A CN109975953 A CN 109975953A CN 201910152492 A CN201910152492 A CN 201910152492A CN 109975953 A CN109975953 A CN 109975953A
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- optical lens
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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
- G02B13/0035—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 three lenses
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Lenses (AREA)
Abstract
The present invention provides a kind of optical lens, successively includes: the first lens with negative power from object side to imaging surface, and object side surface is concave surface；Diaphragm；The second lens with positive light coke；The third lens with negative power, image side surface are concave surface；Optical filter.Optical lens in the present invention, using three pieces lens, and reasonable focal power of arranging in pairs or groups between three pieces lens, reduce the aberration of optical lens, propose high-resolution quality, when being used as fingerprint recognition camera lens using this optical lens, imaging reliability with higher, it is ensured that the safety of user and privacy.
Description
Technical field
The present invention relates to optical image technology field, in particular to a kind of optical lens.
Background technique
Shield lower fingerprint identification technology, is by optical imaging concept by user fingerprints information (the fingerprint line that human eye is seen
Endpoint, bifurcation of reason etc.) collect, and with fingerprint base information comparison, realize a kind of identity validation technology of fingerprint recognition.
As the majority of consumers pursue to the continuous of lower fingerprint recognition is shielded, the smart machines that the overwhelming majority newly releases at present
(such as mobile phone, plate) nearly all carries the lower fingerprint identification function of screen.Since optical lens is to shield lower fingerprint identification device
Important component, in recent years, the demand of the optical lens as fingerprint recognition is also constantly soaring.
However, serious currently used as the aberration of the optical lens of fingerprint recognition, solution is led as poor quality in the prior art
Cause the reliability of fingerprint recognition low, so that not can guarantee safety and the privacy of user.
Summary of the invention
Based on this, the object of the present invention is to provide a kind of optical lens, to solve to be used as fingerprint recognition in the prior art
Optical lens solution as inferior technical problem.
One of work as optical lens according to embodiments of the present invention, successively includes: from object side to imaging surface
The first lens with negative power, object side surface are concave surface；
Diaphragm；
The second lens with positive light coke；
The third lens with negative power, image side surface are concave surface；And
Optical filter.
Compared to the prior art, the optical lens in the present invention uses three pieces lens, and it is reasonable to arrange in pairs or groups between three pieces lens
Focal power, reduce the aberration of optical lens, propose high-resolution quality, when using this optical lens be used as fingerprint recognition camera lens
When, imaging reliability with higher, it is ensured that the safety of user and privacy.
In addition, the optical lens according to embodiments of the present invention, can also have the following additional technical features:
Further, the optical lens meets conditional:
1.7 < f1/ f < 3.3；
Wherein, f is the focal length of the optical lens, f1For the effective focal length of first lens.
It, can be by big visual field since the first lens undertake biggish negative power in the case where meeting above-mentioned relation formula
Divergence of beam, and smoothly and without entering optical system in the case of too big light ray bending, it can guarantee in this way in big field angle
In the case where, not excessive senior aberration goes to correct.
Further, the optical lens meets conditional:
1.3 < TC1/f1< 3.3；
Wherein, TC1For thickness of first lens on optical axis.
In the case where meeting above-mentioned relation formula, the delivery altitude of eyeglass can be effectively reduced, effectively reduces light in back
Delivery altitude on eyeglass effectively reduces the difference for whole visual field aberration, reduces chromatic longitudiinal aberration.
Further, the optical lens meets conditional:
0.21 < SAG11/SAG12< 0.26；
Wherein, SAG11For the rise of the object side of first lens, SAG12For the arrow of the image side surface of first lens
It is high.
It in the case where meeting above-mentioned relation formula, can effectively shorten the optics overall length of camera lens, promote camera lens miniaturization.
Further, the optical lens meets conditional:
- 127 < R1/R2< 60；
Wherein, R1For the curvature variable diameter of the object side of first lens, R2For the curvature of the image side surface of first lens
Radius.
In the case where meeting above-mentioned relation formula, the difficulty of aberration correction can be reduced, is with reasonable distribution system focal power
System can reach better solution as quality.
Further, the camera lens meets conditional:
- 0.41 < (DT21-DT22)/TC2< -0.58；
Wherein, DT21For the maximum effective diameter of the object side of second lens, DT22For the image side of second lens
The maximum effective diameter in face, TC2For thickness of second lens on optical axis.
In the case where meeting above-mentioned relation formula, camera lens can obtain bigger NA value, improve the resolution ratio of camera lens.
Further, the optical lens meets conditional:
1.41 < TCMAX1+TCMAX2+TCMAX3/TCMIN1+TCMIN2+TCMIN3< 1.94；
Wherein, TCMAX1And TCMIN1Respectively described first lens are in the maximum gauge being parallel on optical axis direction and most
Small thickness, TCMAX2And TCMIN2It is second lens in the maximum gauge and minimum thickness being parallel on optical axis direction,
TCMAX3And TCMIN3It is the third mirror in the maximum gauge and minimum thickness being parallel on optical axis direction.
In the case where meeting above-mentioned relation formula, be conducive to correction of the system for the curvature of field and astigmatic image error.
Further, the optical lens meets conditional:
0 < BFL/IH < 0.2；
Wherein, BFL is the back focal length of the optical lens, and IH is the maximum image height of the optical lens.
In the case where meeting above-mentioned relation formula, lens length can be effectively shortened, realize miniaturization.
Further, the non-spherical lens in the optical lens meets following equations:
Wherein, z is that curved surface leaves curved surface vertex in the thickness of optical axis direction, and c is the curvature on curved surface vertex, and k is secondary song
Face coefficient, h are optical axis to the thickness of curved surface, and B, C, D, E, F, G, H are respectively quadravalence, six ranks, eight ranks, ten ranks, ten second orders, 14
Rank, 16 rank surface coefficients.
Further, the optical lens further include:
Plate glass, set on first lens close to the side of object side；
Wherein, first lens, second lens and the third lens are glass lens.
Detailed description of the invention
Fig. 1 a is the structural schematic diagram of the optical lens in first embodiment of the invention；
Fig. 1 b is penalty kick dyeing dygoram on the axis of the optical lens in first embodiment of the invention；
Fig. 1 c is the lateral chromatic aberration curve graph of the optical lens in first embodiment of the invention；
Fig. 1 d is the curvature of field and distortion curve of the optical lens in first embodiment of the invention；
Fig. 2 a is the structural schematic diagram of the optical lens in second embodiment of the invention；
Fig. 2 b is penalty kick dyeing dygoram on the axis of the optical lens in second embodiment of the invention；
Fig. 2 c is the lateral chromatic aberration curve graph of the optical lens in second embodiment of the invention；
Fig. 2 d is the curvature of field and distortion curve of the optical lens in second embodiment of the invention；
Fig. 3 a is the structural schematic diagram of the optical lens in third embodiment of the invention；
Fig. 3 b is penalty kick dyeing dygoram on the axis of the optical lens in third embodiment of the invention；
Fig. 3 c is the lateral chromatic aberration curve graph of the optical lens in third embodiment of the invention；
Fig. 3 d is the curvature of field and distortion curve of the optical lens in third embodiment of the invention；
Fig. 4 a is the structural schematic diagram of the optical lens in fourth embodiment of the invention；
Fig. 4 b is penalty kick dyeing dygoram on the axis of the optical lens in fourth embodiment of the invention；
Fig. 4 c is the lateral chromatic aberration curve graph of the optical lens in fourth embodiment of the invention；
Fig. 4 d is the curvature of field and distortion curve of the optical lens in fourth embodiment of the invention；
Main element symbol description:
| Plate glass | 1 | First lens | 2 |
| Diaphragm | 3 | Second lens | 4 |
| The third lens | 5 | Optical filter | 6 |
The present invention that the following detailed description will be further explained with reference to the above drawings.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give several embodiments of the invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is make it is more thorough and comprehensive to the disclosure.
It should be noted that it can directly on the other element when element is referred to as " being fixedly arranged on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement are for illustrative purposes only.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Embodiment 1
Fig. 1 a is please referred to, the optical lens showing in first embodiment of the invention successively includes from object side to imaging surface
Plate glass 1, the first lens 2, diaphragm 3, the second lens 4, the third lens 5 and optical filter 6, first lens 2 have negative
Focal power, and object side surface is concave surface, second lens 4 have positive light coke, and the third lens have negative power,
Image side surface is concave surface, and the optical filter 6 is infrared fileter.
Wherein, first lens 2, second lens 4 and the third lens 5 are glass lens.Specifically, institute
The material for stating the first lens 2 is K26R, and the material of second lens 4 is APL5014CL, and the material of the third lens 5 is
EP7000。
Further, the optical lens meets conditional:
1.7 < f1/ f < 3.3 ... ... ... .. (1)；
Wherein, f is the focal length of the optical lens, f1For the effective focal length of first lens.
It, can will be big since the first lens 2 undertake biggish negative power in the case where meeting above-mentioned relation formula (1)
Field rays diverging, and smoothly and without entering optical system in the case of too big light ray bending, it can guarantee regarding greatly in this way
In the case where rink corner, not excessive senior aberration goes to correct.
Further, the optical lens meets conditional:
1.3 < TC1/f1< 3.3 ... ... ... .. (2)；
Wherein, TC1For thickness of first lens on optical axis.
In the case where meeting above-mentioned relation formula (2), the delivery altitude of eyeglass can be effectively reduced, effectively reduces light rear
Delivery altitude on the eyeglass of side effectively reduces the difference for whole visual field aberration, reduces chromatic longitudiinal aberration.
Further, the optical lens meets conditional:
0.21 < SAG11/SAG12< 0.26 ... ... ... .. (3)；
Wherein, SAG11For the rise of the object side of first lens, SAG12For the arrow of the image side surface of first lens
It is high.
It in the case where meeting above-mentioned relation formula (3), can effectively shorten the optics overall length of camera lens, promote camera lens small-sized
Change.
Further, the optical lens meets conditional:
- 127 < R1/R2< 60 ... ... ... .. (4)；
Wherein, R1For the curvature variable diameter of the object side of first lens, R2For the curvature of the image side surface of first lens
Radius.
In the case where meeting above-mentioned relation formula (4), the difficulty of aberration correction can be reduced with reasonable distribution system focal power
Degree, system can reach better solution as quality.
Further, the camera lens meets conditional:
- 0.41 < (DT21-DT22)/TC2< -0.58 ... ... ... .. (5)；
Wherein, DT21For the maximum effective diameter of the object side of second lens, DT22For the image side of second lens
The maximum effective diameter in face, TC2For thickness of second lens on optical axis.
In the case where meeting above-mentioned relation formula (5), camera lens can obtain bigger NA value, improve the resolution ratio of camera lens.
Further, the optical lens meets conditional:
1.41 < TCMAX1+TCMAX2+TCMAX3/TCMIN1+TCMIN2+TCMIN3< 1.94 ... .. (6)；
Wherein, TCMAX1And TCMIN1Respectively described first lens are in the maximum gauge being parallel on optical axis direction and most
Small thickness, TCMAX2And TCMIN2It is second lens in the maximum gauge and minimum thickness being parallel on optical axis direction,
TCMAX3And TCMIN3It is the third mirror in the maximum gauge and minimum thickness being parallel on optical axis direction.
In the case where meeting above-mentioned relation formula (6), be conducive to correction of the system for the curvature of field and astigmatic image error.
Further, the optical lens meets conditional:
0 < BFL/IH < 0.2 ... ... ... .. (7)；
Wherein, BFL is the back focal length of the optical lens, and IH is the maximum image height of the optical lens.
In the case where meeting above-mentioned relation formula (7), lens length can be effectively shortened, realize miniaturization.
Further, the non-spherical lens in the optical lens meets following equations:
Wherein, z is that curved surface leaves curved surface vertex in the thickness of optical axis direction, and c is the curvature on curved surface vertex, and k is secondary song
Face coefficient, h are optical axis to the thickness of curved surface, and B, C, D, E, F, G, H are respectively quadravalence, six ranks, eight ranks, ten ranks, ten second orders, 14
Rank, 16 rank surface coefficients.
Table 1-1 is please referred to, the relevant parameter of each eyeglass in the optical lens in the present embodiment is shown.
Table 1-1:
| Surface serial number | R (radius of curvature) | D (thickness) | Nd (refractive index) | Vd (Abbe number) | |
| S1 | Object | — | |||
| S2 | Plate glass | — | 1.5 | 1.52 | 54.5 |
| S3 | 0.2207 | ||||
| S4 | First lens | -53.5055 | 1.425 | 1.53 | 55.7 |
| S5 | 0.41837 | 0.37740 | |||
| S6 | Diaphragm | -0.01516 | |||
| S7 | Second lens | 0.76121 | 0.62625 | 1.54 | 56 |
| S8 | -0.4476 | 0.06950 | |||
| S9 | The third lens | 0.68366 | 0.29913 | 1.65 | 21.5 |
| S10 | 0.66022 | 0.200 | |||
| S11 | Optical filter | — | 0.15 | 1.52 | 54.5 |
| S12 | — | 0.22075 | |||
| S13 | Imaging surface | — | — |
Table 1-2 is please referred to, the aspherical parameter of the optical lens in the present embodiment is shown.
Table 1-2:
In the present embodiment, the focal length f of the optical lens is 0.453mm, optics overall length TLFor 5.05mm, F-number
F#It is 1.66,2 θ of field angle is 151 °.
Please refer to Fig. 1 b, 1c, 1d, show penalty kick dyeing dygoram on the axis of optical lens in the present embodiment,
Lateral chromatic aberration curve graph, the curvature of field and distortion curve, the curvature of field, distortion, color difference can in the present embodiment it can be seen from 1b to 1d
It is corrected well.
To sum up, the optical lens in the present embodiment, using three pieces lens, and reasonable light focus of arranging in pairs or groups between three pieces lens
Degree, while the optical lens meets above-mentioned relation formula (1) to (8), greatly reduces the aberration of optical lens, mentions high-resolution product
Matter, when being used as fingerprint recognition camera lens using this optical lens, imaging reliability with higher, it is ensured that the safety of user
Property and privacy.
Embodiment 2
Fig. 2 a is please referred to, the optical lens showing in second embodiment of the invention, in the present embodiment, the light
The focal length f for learning camera lens is 0.349, optics overall length TLIt is 5.08, F-number F#It is 1.66,2 θ of field angle is 136.4 °.
Table 2-1 is please referred to, the relevant parameter of each eyeglass in the optical lens in the present embodiment is shown.
Table 2-1:
Table 2-2 is please referred to, the aspherical parameter of the optical lens in the present embodiment is shown.
Table 2-2:
Please refer to Fig. 2 b, 2c, 2d, show penalty kick dyeing dygoram on the axis of optical lens in the present embodiment,
Lateral chromatic aberration curve graph, the curvature of field and distortion curve, the curvature of field, distortion, color difference can in the present embodiment it can be seen from 2b to 2d
It is corrected well.
Embodiment 3
Fig. 3 a is please referred to, the optical lens showing in third embodiment of the invention, in the present embodiment, the light
The focal length f for learning camera lens is 0.405, optics overall length TLIt is 5.01, F-number F#It is 1.66,2 θ of field angle is 144.8 °.
Table 3-1 is please referred to, the relevant parameter of each eyeglass in the optical lens in the present embodiment is shown.
Table 3-1:
| Surface serial number | R (radius of curvature) | D (thickness) | Nd (refractive index) | Vd (Abbe number) | |
| S1 | Object | — | |||
| S2 | Plate glass | — | 1.5 | 1.52 | 54.5 |
| S3 | 0.2207 | ||||
| S4 | First lens | 37.5663 | 0.3170 | 1.53 | 55.7 |
| S5 | 0.6249 | 1.38502 | |||
| S6 | Diaphragm | -0.03665 | |||
| S7 | Second lens | 0.77071 | 0.70671 | 1.54 | 56 |
| S8 | -0.48460 | 0.06853 | |||
| S9 | The third lens | 1.28589 | 0.30076 | 1.65 | 21.5 |
| S10 | 0.58691 | 0.200 | |||
| S11 | Optical filter | — | 0.15 | 1.52 | 54.5 |
| S12 | — | 0.22075 | |||
| S13 | Imaging surface | — | — |
Table 3-2 is please referred to, the aspherical parameter of the optical lens in the present embodiment is shown.
Table 3-2:
Please refer to Fig. 3 b, 3c, 3d, show penalty kick dyeing dygoram on the axis of optical lens in the present embodiment,
Lateral chromatic aberration curve graph, the curvature of field and distortion curve, the curvature of field, distortion, color difference can in the present embodiment it can be seen from 3b to 3d
It is corrected well.
Fig. 4 a is please referred to, the optical lens showing in fourth embodiment of the invention, in the present embodiment, the light
The focal length f for learning camera lens is 0.409, optics overall length TLIt is 4.8, F-number F#It is 1.68,2 θ of field angle is 149.6 °.
Table 4-1 is please referred to, the relevant parameter of each eyeglass in the optical lens in the present embodiment is shown.
Table 4-1:
Table 4-2 is please referred to, the aspherical parameter of the optical lens in the present embodiment is shown.
Table 4-2:
Please refer to Fig. 4 b, 4c, 4d, show penalty kick dyeing dygoram on the axis of optical lens in the present embodiment,
Lateral chromatic aberration curve graph, the curvature of field and distortion curve, the curvature of field, distortion, color difference can in the present embodiment it can be seen from 4b to 4d
It is corrected well.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of optical lens, which is characterized in that successively include: from object side to imaging surface
The first lens with negative power, object side surface are concave surface；
Diaphragm；
The second lens with positive light coke；
The third lens with negative power, image side surface are concave surface；And
Optical filter.
2. optical lens according to claim 1, which is characterized in that the optical lens meets conditional:
1.7 < f1/ f < 3.3；
Wherein, f is the focal length of the optical lens, f1For the effective focal length of first lens.
3. optical lens according to claim 2, which is characterized in that the optical lens meets conditional:
1.3 < TC1/f1< 3.3；
Wherein, TC1For thickness of first lens on optical axis.
4. optical lens according to claim 1, which is characterized in that the optical lens meets conditional:
0.21 < SAG11/SAG12< 0.26；
Wherein, SAG11For the rise of the object side of first lens, SAG12For the rise of the image side surface of first lens.
5. optical lens according to claim 1, which is characterized in that the optical lens meets conditional:
- 127 < R1/R2< 60；
Wherein, R1For the curvature variable diameter of the object side of first lens, R2For the curvature half of the image side surface of first lens
Diameter.
6. optical lens according to claim 1, which is characterized in that the camera lens meets conditional:
- 0.41 < (DT21-DT22)/TC2< -0.58；
Wherein, DT21For the maximum effective diameter of the object side of second lens, DT22For the image side surface of second lens
Maximum effective diameter, TC2For thickness of second lens on optical axis.
7. optical lens according to claim 1, which is characterized in that the optical lens meets conditional:
1.41 < TCMAX1+TCMAX2+TCMAX3/TCMIN1+TCMIN2+TCMIN3< 1.94；
Wherein, TCMAX1And TCMIN1Respectively described first lens are thick in the maximum gauge and minimum being parallel on optical axis direction
Degree, TCMAX2And TCMIN2It is second lens in the maximum gauge and minimum thickness being parallel on optical axis direction, TCMAX3With
TCMIN3It is the third mirror in the maximum gauge and minimum thickness being parallel on optical axis direction.
8. optical lens according to claim 1, which is characterized in that the optical lens meets conditional:
0 < BFL/IH < 0.2；
Wherein, BFL is the back focal length of the optical lens, and IH is the maximum image height of the optical lens.
9. optical lens according to claim 1, which is characterized in that under the non-spherical lens in the optical lens meets
It establishes an equation:
Wherein, z is that curved surface leaves curved surface vertex in the thickness of optical axis direction, and c is the curvature on curved surface vertex, and k is quadratic surface system
Number, h be optical axis to curved surface thickness, B, C, D, E, F, G, H be respectively quadravalence, six ranks, eight ranks, ten ranks, ten second orders, ten quadravalences,
16 rank surface coefficients.
10. according to claim 1 to optical lens described in 9 any one, which is characterized in that the optical lens further include:
Plate glass, set on first lens close to the side of object side；
Wherein, first lens, second lens and the third lens are glass lens.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187480A (en) * | 2019-07-23 | 2019-08-30 | 江西联益光学有限公司 | Imaging lens system |
| CN110751047A (en) * | 2019-09-20 | 2020-02-04 | 维沃移动通信有限公司 | Fingerprint identification module and electronic equipment |
| WO2021031284A1 (en) * | 2019-08-16 | 2021-02-25 | 诚瑞光学(常州)股份有限公司 | Photographing optical lens |
| CN112666687A (en) * | 2021-03-17 | 2021-04-16 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN113093370A (en) * | 2021-04-13 | 2021-07-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
| US11385440B2 (en) | 2019-04-10 | 2022-07-12 | Largan Precision Co., Ltd. | Optical photographing lens assembly, fingerprint identification module and electronic device |
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