CN110187482B - Fatigue driving monitoring optical system and camera module applying same - Google Patents
Fatigue driving monitoring optical system and camera module applying same Download PDFInfo
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- CN110187482B CN110187482B CN201910412293.7A CN201910412293A CN110187482B CN 110187482 B CN110187482 B CN 110187482B CN 201910412293 A CN201910412293 A CN 201910412293A CN 110187482 B CN110187482 B CN 110187482B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 63
- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 239000011521 glass Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 5
- 230000004075 alteration Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The embodiment of the invention discloses a fatigue driving monitoring optical system, which sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, and a third lens; the object plane side of the first lens is a concave surface, the image plane side is a convex surface, and the focal power of the first lens is positive; the object plane side of the second lens is a concave surface, the image plane side is a concave surface, and the focal power of the second lens is negative; the object plane side of the third lens is a concave surface, the image plane side is a convex surface, and the focal power of the third lens is positive. On the other hand, the embodiment of the invention also provides a camera module. The optical system and the camera module of the embodiment of the invention mainly comprise 3 lenses, have simple structure, small volume, light weight, low cost and the like; different lenses are combined with each other and optical power is reasonably distributed, so that the long-term reliability requirement of the lens and the service life of the lens can be ensured, and the lens has the characteristics of high resolution, high infrared definition, high reliability and excellent temperature.
Description
Technical field:
the invention relates to an optical system and a camera module applied to the optical system, in particular to a fatigue driving monitoring optical system and a camera module applied to the optical system.
The background technology is as follows:
The existing optical system or module for fatigue driving early warning generally has the problems of complex structure, unfavorable long-term reliability requirement and short service life.
The invention comprises the following steps:
In order to solve the problems that an existing optical system or module for fatigue driving early warning is complex in structure and unfavorable for long-term reliability requirements and is short in service life, the embodiment of the invention provides a fatigue driving monitoring optical system.
A fatigue driving monitoring optical system sequentially comprises from an object plane to an image plane along an optical axis: a first lens, a second lens, and a third lens;
The object plane side of the first lens is a concave surface, the image plane side is a convex surface, and the focal power of the first lens is positive;
the object plane side of the second lens is a concave surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
The object plane side of the third lens is a concave surface, the image plane side is a convex surface, and the focal power of the third lens is positive.
On the other hand, the embodiment of the invention also provides a camera module.
The camera module at least comprises an optical lens, wherein the fatigue driving monitoring optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 3 lenses, have the advantages of simple structure, small volume, light weight, low cost and the like, can meet the use of 2 million pixel chips, and are convenient to be matched with a miniaturized fatigue monitoring and early warning system; different lenses are combined with each other and optical power is reasonably distributed, lens aberration is optimized, long-term reliability requirements of the lens and service life of the lens can be guaranteed, and the lens has good performances of high resolution, high infrared definition, high reliability, excellent temperature characteristics (-40 ℃ to +105 ℃) and the like.
Description of the drawings:
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical system or camera module according to an embodiment of the present invention;
FIG. 2 is a graph of MTF for an embodiment of an optical system or camera module of the present invention;
FIG. 3 is a graph of-40℃defocus for an embodiment of the optical system or camera module of the present invention;
FIG. 4 is a +105℃defocusmap of an embodiment of the optical system or camera module of the present invention.
The specific embodiment is as follows:
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
When embodiments of the present invention refer to the ordinal terms "first," "second," etc., it is to be understood that they are merely used for distinguishing between them unless the order of their presentation is indeed dependent on the context.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, a fatigue driving monitoring optical system sequentially includes, from an object plane to an image plane along an optical axis: a first lens 1, a second lens 2, and a third lens 3.
The object plane side of the first lens 1 is a concave surface, the image plane side is a convex surface, and the focal power of the first lens is positive;
The object plane side of the second lens 2 is a concave surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens 3 is a concave surface, the image plane side is a convex surface, and the optical power thereof is positive.
The optical system of the embodiment of the invention mainly consists of 3 lenses, has the advantages of simple structure, small volume, light weight, low cost and the like, can meet the use of 2 million pixel chips, and is convenient to be matched with a miniaturized fatigue monitoring and early warning system; different lenses are combined with each other and optical power is reasonably distributed, lens aberration is optimized, long-term reliability requirements of the lens and service life of the lens can be guaranteed, and the lens has good performances of high resolution, high infrared definition, high reliability, excellent temperature characteristics (-40 ℃ to +105 ℃) and the like.
Further, as a preferred embodiment of the present invention, not limited thereto, the focal length f2 of the second lens 2 and the focal length f3 of the third lens 3 satisfy: |f2| ] |f3|. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, not limiting, between the focal length f2 of the second lens 2 and the focal length f3 of the third lens 3, there is satisfied: 1< |f2/f3|. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present invention, not limited thereto, the focal length f1 of the first lens 1 and the focal length f2 of the second lens 2 satisfy: 1.5 < |f1/f2|. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, not limiting, the focal length f1 of the first lens 1 and the focal length f of the entire optical system satisfy: 1 < |f/f1|; the focal length f2 of the second lens 2 and the focal length f of the entire optical system satisfy the following conditions: 1 < |f/f2|. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the first lens 1 and the third lens 3 are glass lenses, and the second lens 2 is a glass aspherical lens. By selecting the glass aspheric lens, the focal power of the lens is reasonably distributed, the aberration of the lens is further optimized, and good optical performance is ensured.
Further, as a preferred embodiment of the present invention, not limited thereto, the thickness value D2 of the second lens 2 from the object plane side to the image plane side along the optical axis and the thickness value D1 of the first lens 1 satisfy: d2: d1 =1: 4 to 5. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the material refractive index Nd1, the material abbe constant Vd1 of the first lens satisfy: 1.75< Nd1, vd1<55. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the refractive index Nd2 of the material, the abbe constant Vd2 of the second lens satisfy: 1.45< nd2<1.75, 25< vd2<90. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present invention, but not limited to, the refractive index Nd3 of the material and the abbe constant Vd3 of the material of the third lens satisfy: 1.75< Nd3, vd3<55. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, but not limiting, a stop of the optical system is located between the first lens and the second lens. For adjusting the intensity of the light beam.
Still further, as a preferred embodiment of the present invention, and not by way of limitation, the horizontal direction field angle HFOV of the optical system satisfies: HFOV is less than 40 DEG and less than 60 deg. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present invention, not limited thereto, the optical total length TTL of the optical system satisfies: 7mm < TTL <12mm. The structure is simple, and good optical performance can be ensured.
Specifically, as a preferred embodiment of the present invention, but not limited to, the optical system of the present invention has a focal length f=4.66 mm, a stop index F/no=2.2, a horizontal viewing angle hfov=54.2°, an optical total length ttl=9.90 mm, and the following basic parameters of the optical system are shown in the following table:
| Surface of the body | Radius of curvature R (mm) | Interval D (mm) | Refractive index Nd | Dispersion value Vd |
| S1 | -21.79 | 1.83 | 2.01 | 28.32 |
| S2 | -5.54 | -0.05 | ||
| STO | Infinity (infinity) | 0.40 | ||
| S4 | -61.12 | 0.45 | 1.52 | 64.05 |
| S5 | 2.23 | 0.39 | ||
| S6 | -24.66 | 1.14 | 2.00 | 28.32 |
| S7 | -3.03 | 0.30 | ||
| IMA | Infinity (infinity) |
In the table, from the object plane to the image plane 5 along the optical axis, S1 and S2 are two surfaces of the first lens 1 correspondingly; STO is the diaphragm; s4 and S5 correspond to two surfaces of the second lens 2; s6 and S7 correspond to two surfaces of the third lens 3; IMA is the image plane 6.
Still further, as a preferred embodiment of the present invention, not limiting, the surface of the second lens 2 is aspherical in shape, which satisfies the following equation:
Wherein, the parameter c=1/R is the curvature corresponding to the radius, y is the radial coordinate, the unit is the same as the lens length unit, k is conic coefficient, and a 1 to a 8 are coefficients corresponding to the radial coordinates respectively. The values of the aspherical correlation of the S4 surface and the S5 surface of the second lens 2 are shown in the following table:
As can be seen from fig. 2 to 4, the optical system of the present embodiment has excellent performances such as high resolution, excellent temperature characteristics, high reliability, and the like.
The camera module at least comprises an optical lens, wherein the fatigue driving monitoring optical system is arranged in the optical lens.
The camera module of the embodiment of the invention mainly consists of 3 lenses, has the advantages of simple structure, small volume, light weight, low cost and the like, can meet the use of 2 million pixel chips, and is convenient to be matched with a miniaturized fatigue monitoring and early warning system; different lenses are combined with each other and optical power is reasonably distributed, lens aberration is optimized, long-term reliability requirements of the lens and service life of the lens can be guaranteed, and the lens has good performances of high resolution, high infrared definition, high reliability, excellent temperature characteristics (-40 ℃ to +105 ℃) and the like.
The foregoing description of one or more embodiments provided in connection with the specific disclosure is not intended to limit the practice of the invention to such description. The method, structure, etc. similar to or identical to those of the present invention, or some technical deductions or substitutions are made on the premise of the inventive concept, should be regarded as the protection scope of the present invention.
Claims (3)
1. A fatigue driving monitoring optical system sequentially comprises from an object plane to an image plane along an optical axis: a first lens, a second lens, and a third lens; it is characterized in that the method comprises the steps of,
The object plane side of the first lens is concave, the curvature radius is-21.79 mm, the image plane side is convex, the curvature radius is-5.54 mm, the focal power is positive, the thickness is 1.83mm, the refractive index is 2.01, and the distance from the first lens to the second lens is 0.35mm;
the object plane side of the second lens is a concave surface, the curvature radius is-61.12 mm, the image plane side is a concave surface, the curvature radius is 2.23mm, the focal power is negative, the thickness is 0.45mm, the refractive index is 1.52, and the distance from the second lens to the third lens is 0.39mm;
The object plane side of the third lens is concave, the curvature radius is-24.66 mm, the image plane side is convex, the curvature radius is-3.03 mm, the focal power is positive, the thickness is 1.14mm, and the refractive index is 2.00;
the focal length f=4.66 mm, the stop index F/no=2.2, the horizontal viewing angle hfov=54.2°, and the total optical length ttl=9.90 mm.
2. The fatigue driving monitoring optical system of claim 1, wherein the first lens and the third lens are glass lenses, and the second lens is a glass aspherical lens.
3. An imaging module at least comprising an optical lens, wherein the fatigue driving monitoring optical system of any one of claims 1-2 is installed in the optical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910412293.7A CN110187482B (en) | 2019-05-17 | 2019-05-17 | Fatigue driving monitoring optical system and camera module applying same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910412293.7A CN110187482B (en) | 2019-05-17 | 2019-05-17 | Fatigue driving monitoring optical system and camera module applying same |
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| Publication Number | Publication Date |
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| CN110187482A CN110187482A (en) | 2019-08-30 |
| CN110187482B true CN110187482B (en) | 2024-06-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288166A (en) * | 1999-09-09 | 2001-03-21 | 恩普乐股份有限公司 | Lens for taking picture |
| CN102736214A (en) * | 2011-04-08 | 2012-10-17 | 大立光电股份有限公司 | Image capturing photographing lens assembly |
| CN108279485A (en) * | 2018-03-09 | 2018-07-13 | 浙江舜宇光学有限公司 | Projection lens |
| CN209879124U (en) * | 2019-05-17 | 2019-12-31 | 广东弘景光电科技股份有限公司 | Fatigue driving monitoring optical system and camera module applied by same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005338234A (en) * | 2004-05-25 | 2005-12-08 | Konica Minolta Opto Inc | Imaging lens |
| JP4910723B2 (en) * | 2007-01-29 | 2012-04-04 | コニカミノルタオプト株式会社 | Imaging lens, imaging device, and portable terminal |
| JP6292711B2 (en) * | 2014-04-14 | 2018-03-14 | カンタツ株式会社 | Imaging lens |
-
2019
- 2019-05-17 CN CN201910412293.7A patent/CN110187482B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288166A (en) * | 1999-09-09 | 2001-03-21 | 恩普乐股份有限公司 | Lens for taking picture |
| CN102736214A (en) * | 2011-04-08 | 2012-10-17 | 大立光电股份有限公司 | Image capturing photographing lens assembly |
| CN108279485A (en) * | 2018-03-09 | 2018-07-13 | 浙江舜宇光学有限公司 | Projection lens |
| CN209879124U (en) * | 2019-05-17 | 2019-12-31 | 广东弘景光电科技股份有限公司 | Fatigue driving monitoring optical system and camera module applied by same |
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