CN111352217A - Fatigue driving monitoring optical system and camera module applied by same - Google Patents
Fatigue driving monitoring optical system and camera module applied by same Download PDFInfo
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- CN111352217A CN111352217A CN202010229908.5A CN202010229908A CN111352217A CN 111352217 A CN111352217 A CN 111352217A CN 202010229908 A CN202010229908 A CN 202010229908A CN 111352217 A CN111352217 A CN 111352217A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 74
- 238000012544 monitoring process Methods 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
- 239000011521 glass Substances 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
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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, a third lens, a fourth lens, and a fifth lens; the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative; the object surface side of the second lens is a convex surface, the image surface side is a convex surface, and the focal power of the second lens is positive; the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative; the object surface side of the fourth lens is a concave surface, the image surface side of the fourth lens is a concave surface, and the focal power of the fourth lens is negative; the fifth lens element has a convex image surface side and a convex image surface side, and has positive refractive power. On the other hand, the embodiment of the invention also provides a camera module. The optical system and the camera module provided by the embodiment of the invention have the advantages of small volume, light weight and low cost; meanwhile, the method has good performances of small distortion, high analysis force, excellent temperature characteristic and the like.
Description
The technical field is as follows:
the invention relates to an optical system and a camera module applied by the same, in particular to a fatigue driving monitoring optical system and a camera module applied by the same.
Background art:
at present, when the automobile is safely driven, particularly in long-distance driving, fatigue driving causes great hidden danger to life safety, so that a fatigue driving early warning system is produced at will. The fatigue driving early warning system is based on the physiological image reaction of a driver, consists of an ECU and an optical system or a camera module, utilizes the facial features, eye signals, head motility and the like of the driver to infer the fatigue state of the driver, and carries out alarm prompt and takes corresponding measures. Fatigue identification relies on optical system or the module of making a video recording to catch the image, but because reasons such as glasses reflection of light and the interior light environment of car are complicated, if optical system or the module of making a video recording is at visible light scope formation of image like the reason can increase the error rate of discernment, so optical system or the module of making a video recording can be fine to near infrared band formation of image and avoid these circumstances.
However, the existing fatigue driving monitoring optical system or camera module has the defects of large number of lenses, large volume, long-term reliability and short service life.
The invention content is as follows:
in order to overcome the problems of a large number of lenses and a large volume of the conventional fatigue driving monitoring optical system or camera module, the embodiment of the invention provides a fatigue driving monitoring optical system on the one hand.
A fatigue driving monitoring optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens;
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side is a convex surface, and the focal power of the second lens is positive;
the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative;
the object surface side of the fourth lens is a concave surface, the image surface side of the fourth lens is a concave surface, and the focal power of the fourth lens is negative;
the fifth lens element has a convex image surface side and a convex image surface side, and has positive refractive power.
On the other hand, the embodiment of the invention also provides a camera module.
A camera module at least comprises an optical lens, and the fatigue driving monitoring optical system is installed in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 5 lenses, the number of the lenses is reasonable, and the optical system and the camera module have the advantages of small volume, light weight and low cost; different lenses are combined with each other and the focal power is reasonably distributed, so that the optical fiber has good performances of small distortion, high resolution, excellent temperature characteristic (-40 ℃ to +105 ℃), high reliability and the like, can meet the use requirement of 2 million pixel chips, and is convenient to be matched with a miniaturized fatigue monitoring system.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an optical system or a camera module according to an embodiment of the present invention;
FIG. 2 is a MTF graph of an embodiment of an optical system or camera module of the present invention;
fig. 3 is a distortion curve diagram of the optical system or the camera module according to the present invention.
The specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present 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 merely illustrative of the invention and are not intended to limit the invention.
When embodiments of the present invention refer to the ordinal numbers "first", "second", etc., it should be understood that the words are used for distinguishing between them unless the context clearly dictates otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a fatigue driving monitoring optical system includes, in order from an object plane to an image plane along an optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5.
The object surface side of the first lens 1 is a convex surface, the image surface side is a concave surface, and the focal power is negative;
the object surface side of the second lens 2 is a convex surface, the image surface side is a convex surface, and the focal power is positive;
the object plane side of the third lens 3 is a concave surface, the image plane side is a convex surface, and the focal power is negative;
the object plane side of the fourth lens 4 is a concave surface, the image plane side is a concave surface, and the focal power is negative;
the fifth lens element 5 has a convex surface on the image plane side and a convex surface on the image plane side, and has positive power.
The optical system of the embodiment of the invention mainly comprises 5 lenses, has reasonable number of lenses, and has the advantages of small volume, light weight and low cost; different lenses are combined with each other and the focal power is reasonably distributed, so that the optical fiber has good performances of small distortion, high resolution, excellent temperature characteristic (-40 ℃ to +105 ℃), high reliability and the like, can meet the use requirement of 2 million pixel chips, and is convenient to be matched with a miniaturized fatigue monitoring system.
Further, as another preferred embodiment of the present invention, without limitation, each lens of the optical system satisfies the following condition:
(1)3.4mm<f3<7.4mm；
(2)-5.5mm<f4<-1.5mm；
(3)3.6mm<f5<7.6mm；
where f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens. Adopts different lenses to combine with each other and reasonably distribute the focal power, and has the advantages of small distortion, high resolution, excellent temperature characteristic (-40 ℃ to +105 ℃), high reliability and the like.
Still further, as another preferred embodiment of the present invention, without limiting the same, each lens of the optical system satisfies the following condition:
(1)-15mm<f34<-5mm；
(2)0.5＜∣f4/f∣＜1；
wherein f34 is the combined focal length of the third lens and the fourth lens, f is the focal length of the whole optical system, and f4 is the focal length of the fourth lens. Adopts different lenses to combine with each other and reasonably distribute the focal power, and has the advantages of small distortion, high resolution, excellent temperature characteristic (-40 ℃ to +105 ℃), high reliability and the like.
Further, as another preferred embodiment of the present invention, not limited thereto, the horizontal direction field angle HFOV of the optical system satisfies: 40 DEG < HFOV < 60 deg. Simple structure and can ensure good optical performance.
Still further, as another preferred embodiment of the present invention, but not limited thereto, the effective focal length f of the optical system satisfies: 4mm < f <6.5 mm. Simple structure and can ensure good optical performance.
Still further, as another preferred embodiment of the present invention, but not limited thereto, the total optical length TTL of the optical system satisfies: 7mm < TTL <10 mm. Further reduce the product volume, be convenient for cooperate miniaturized fatigue monitoring system's use.
Further, as another preferred embodiment of the present invention, but not limited thereto, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: | f4 | < | f3 |. Simple structure and can ensure good optical performance.
Still further, as another preferred embodiment of the present invention, but not limited thereto, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: | f4 | < | f5 |. Simple structure and can ensure good optical performance.
Still further, as another preferred embodiment of the present invention, but not limited thereto, a combined focal length f34 of the third lens and the fourth lens satisfies: -15mm < f34< -5 mm. Simple structure and can ensure good optical performance.
Further, as another preferred embodiment of the present invention, but not limited thereto, a ratio of the focal length f4 of the fourth lens to the effective focal length f of the optical system satisfies: 0.5 < | f4/f | 1. Simple structure and can ensure good optical performance.
Still further, as another preferred embodiment of the present invention, but not limited thereto, the refractive index Nd3 of the material and the abbe constant Vd3 of the material of the third lens satisfy: 1.75< Nd3<2.1, 19< Vd3< 55. Good optical performance can be ensured.
Still further, as another preferred embodiment of the present invention, but not limited thereto, the refractive index Nd4 of the material and the abbe constant Vd4 of the material of the fourth lens satisfy: 1.45< Nd3<1.70, 50< Vd3< 91. Good optical performance can be ensured.
Still further, as another preferred embodiment of the present invention, but not limited thereto, the refractive index Nd5 of the material and the abbe constant Vd5 of the material of the fifth lens satisfy: 1.75< Nd5<2.1, 17< Vd5< 55. Good optical performance can be ensured.
Still further, as another preferred embodiment of the present invention, not limited thereto, 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 another preferred embodiment of the present invention, not intended to be limiting, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass lenses. The long-term reliability requirement and the service life of the lens can be ensured, and the lens has the traditional advantages of small volume, low cost, easy processing and the like. Compared with a glass aspheric configuration, the cost is reduced, the performance of the lens is optimized, and the miniaturization design of the lens is realized.
Further, as a preferred embodiment of the present invention, but not limited thereto, the effective focal length F of the optical system is 4.88mm, the stop index F/NO is 2.8, the horizontal field angle HFOV is 55 °, the total optical length TTL is 7.95mm, and the optical distortion is-9.96%. Specifically, the basic parameters of the optical system are shown in the following table:
in the above table, S1, S2 correspond to two surfaces of the first lens 1 from the object plane to the image plane 7 along the optical axis; STO is the position of the diaphragm 6; s4, S5 correspond to both surfaces of the second lens 2; s6, S7 correspond to both surfaces of the third lens 3; s8, S9 correspond to both surfaces of the fourth lens 4; s10, S11 correspond to both surfaces of the fifth lens 5; s12 and S13 are two surfaces of the filter positioned between the fifth lens 5 and the image plane 7; IMA is the image plane 7.
As can be seen from fig. 2 to 3, the optical system of the present embodiment has good performances of day and night confocal, large viewing angle, high pixel, and very good athermal property.
A camera module at least comprises an optical lens, and the fatigue driving monitoring optical system is installed in the optical lens.
The camera module of the embodiment of the invention mainly comprises 5 lenses, has reasonable number of lenses, and has the advantages of small volume, light weight and low cost; different lenses are combined with each other and the focal power is reasonably distributed, so that the optical fiber has good performances of small distortion, high resolution, excellent temperature characteristic (-40 ℃ to +105 ℃), high reliability and the like, can meet the use requirement of 2 million pixel chips, and is convenient to be matched with a miniaturized fatigue monitoring system.
The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not intended to limit the practice of the invention to the particular forms disclosed. Similar or identical methods, structures and the like as those of the present invention or several technical deductions or substitutions made on the premise of the conception of the present invention should be considered as the protection scope of the present invention.
Claims (10)
1. A fatigue driving monitoring optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; it is characterized in that the preparation method is characterized in that,
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side is a convex surface, and the focal power of the second lens is positive;
the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative;
the object surface side of the fourth lens is a concave surface, the image surface side of the fourth lens is a concave surface, and the focal power of the fourth lens is negative;
the fifth lens element has a convex image surface side and a convex image surface side, and has positive refractive power.
2. The fatigue driving monitoring optical system according to claim 1, wherein each lens of the optical system satisfies the following condition:
(1)3.4mm<f3<7.4mm；
(2)-5.5mm<f4<-1.5mm；
(3)3.6mm<f5<7.6mm；
where f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.
3. The fatigue driving monitoring optical system according to claim 1, wherein each lens of the optical system satisfies the following condition:
(1)-15mm<f34<-5mm；
(2)0.5＜∣f4/f∣＜1；
wherein f34 is the combined focal length of the third lens and the fourth lens, f is the focal length of the whole optical system, and f4 is the focal length of the fourth lens.
4. The fatigue driving monitoring optical system according to claim 1, wherein a horizontal direction field angle HFOV of the optical system satisfies: 40 DEG < HFOV < 60 deg.
5. The fatigue driving monitoring optical system according to claim 1, wherein an effective focal length f of the optical system satisfies: 4mm < f <6.5 mm.
6. The fatigue driving monitoring optical system according to claim 1, wherein the total optical length TTL of the optical system satisfies: 7mm < TTL <10 mm.
7. The fatigue driving monitoring optical system according to claim 1, wherein a focal length f3 of the third lens and a focal length f4 of the fourth lens satisfy: | f4 | < | f3 |; and/or
The focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy that: | f4 | < | f5 |.
8. The fatigue driving monitoring optical system according to claim 1, wherein a refractive index Nd3 of a material, an abbe constant Vd3 of the material, and a focal length f3 of the third lens satisfy: 1.75< Nd3<2.1, 19< Vd3<55, 3.4mm < f3<7.4 mm.
9. The fatigue driving monitoring optical system according to claim 1, wherein a refractive index Nd4 of a material, an abbe constant Vd4 of the material, and a focal length f4 of the fourth lens satisfy: 1.45< Nd3<1.70, 50< Vd3<91, -5.5mm < f4< -1.5 mm; and/or
The refractive index Nd5, Abbe constant Vd5 and focal length f5 of the material of the fifth lens satisfy that: 1.75< Nd5<2.1, 17< Vd5<55, 3.6mm < f5<7.6 mm.
10. A camera module, comprising at least an optical lens, wherein the fatigue driving monitoring optical system according to any one of claims 1 to 9 is installed in the optical lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010229908.5A CN111352217A (en) | 2020-03-27 | 2020-03-27 | Fatigue driving monitoring optical system and camera module applied by same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010229908.5A CN111352217A (en) | 2020-03-27 | 2020-03-27 | Fatigue driving monitoring optical system and camera module applied by same |
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